text: // SPDX-License-Identifier: GPL-2.0-or-later
  /**************************************************************************/
  /*                                                                        */
  /*  IBM System i and System p Virtual NIC Device Driver                   */
  /*  Copyright (C) 2014 IBM Corp.                                          */
  /*  Santiago Leon (santi_leon@yahoo.com)                                  */
  /*  Thomas Falcon (tlfalcon@linux.vnet.ibm.com)                           */
  /*  John Allen (jallen@linux.vnet.ibm.com)                                */
  /*                                                                        */
  /*                                                                        */
  /* This module contains the implementation of a virtual ethernet device   */
  /* for use with IBM i/p Series LPAR Linux. It utilizes the logical LAN    */
  /* option of the RS/6000 Platform Architecture to interface with virtual  */
  /* ethernet NICs that are presented to the partition by the hypervisor.   */
  /*									   */
  /* Messages are passed between the VNIC driver and the VNIC server using  */
  /* Command/Response Queues (CRQs) and sub CRQs (sCRQs). CRQs are used to  */
  /* issue and receive commands that initiate communication with the server */
  /* on driver initialization. Sub CRQs (sCRQs) are similar to CRQs, but    */
  /* are used by the driver to notify the server that a packet is           */
  /* ready for transmission or that a buffer has been added to receive a    */
  /* packet. Subsequently, sCRQs are used by the server to notify the       */
  /* driver that a packet transmission has been completed or that a packet  */
  /* has been received and placed in a waiting buffer.                      */
  /*                                                                        */
  /* In lieu of a more conventional "on-the-fly" DMA mapping strategy in    */
  /* which skbs are DMA mapped and immediately unmapped when the transmit   */
  /* or receive has been completed, the VNIC driver is required to use      */
  /* "long term mapping". This entails that large, continuous DMA mapped    */
  /* buffers are allocated on driver initialization and these buffers are   */
  /* then continuously reused to pass skbs to and from the VNIC server.     */
  /*                                                                        */
  /**************************************************************************/
  
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  #include <linux/types.h>
  #include <linux/errno.h>
  #include <linux/completion.h>
  #include <linux/ioport.h>
  #include <linux/dma-mapping.h>
  #include <linux/kernel.h>
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/skbuff.h>
  #include <linux/init.h>
  #include <linux/delay.h>
  #include <linux/mm.h>
  #include <linux/ethtool.h>
  #include <linux/proc_fs.h>
  #include <linux/if_arp.h>
  #include <linux/in.h>
  #include <linux/ip.h>
  #include <linux/ipv6.h>
  #include <linux/irq.h>
  #include <linux/kthread.h>
  #include <linux/seq_file.h>
  #include <linux/interrupt.h>
  #include <net/net_namespace.h>
  #include <asm/hvcall.h>
  #include <linux/atomic.h>
  #include <asm/vio.h>
  #include <asm/iommu.h>
  #include <linux/uaccess.h>
  #include <asm/firmware.h>
  #include <linux/workqueue.h>
  #include <linux/if_vlan.h>
  #include <linux/utsname.h>
  
  #include "ibmvnic.h"
  
  static const char ibmvnic_driver_name[] = "ibmvnic";
  static const char ibmvnic_driver_string[] = "IBM System i/p Virtual NIC Driver";
  
  MODULE_AUTHOR("Santiago Leon");
  MODULE_DESCRIPTION("IBM System i/p Virtual NIC Driver");
  MODULE_LICENSE("GPL");
  MODULE_VERSION(IBMVNIC_DRIVER_VERSION);
  
  static int ibmvnic_version = IBMVNIC_INITIAL_VERSION;
  static void release_sub_crqs(struct ibmvnic_adapter *, bool);
  static int ibmvnic_reset_crq(struct ibmvnic_adapter *);
  static int ibmvnic_send_crq_init(struct ibmvnic_adapter *);
  static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *);
  static int ibmvnic_send_crq(struct ibmvnic_adapter *, union ibmvnic_crq *);
  static int send_subcrq_indirect(struct ibmvnic_adapter *, u64, u64, u64);
  static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance);
  static int enable_scrq_irq(struct ibmvnic_adapter *,
  			   struct ibmvnic_sub_crq_queue *);
  static int disable_scrq_irq(struct ibmvnic_adapter *,
  			    struct ibmvnic_sub_crq_queue *);
  static int pending_scrq(struct ibmvnic_adapter *,
  			struct ibmvnic_sub_crq_queue *);
  static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *,
  					struct ibmvnic_sub_crq_queue *);
  static int ibmvnic_poll(struct napi_struct *napi, int data);
  static void send_query_map(struct ibmvnic_adapter *adapter);
  static int send_request_map(struct ibmvnic_adapter *, dma_addr_t, u32, u8);
  static int send_request_unmap(struct ibmvnic_adapter *, u8);
  static int send_login(struct ibmvnic_adapter *adapter);
  static void send_query_cap(struct ibmvnic_adapter *adapter);
  static int init_sub_crqs(struct ibmvnic_adapter *);
  static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter);
  static int ibmvnic_reset_init(struct ibmvnic_adapter *, bool reset);
  static void release_crq_queue(struct ibmvnic_adapter *);
  static int __ibmvnic_set_mac(struct net_device *, u8 *);
  static int init_crq_queue(struct ibmvnic_adapter *adapter);
  static int send_query_phys_parms(struct ibmvnic_adapter *adapter);
  static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
  					 struct ibmvnic_sub_crq_queue *tx_scrq);
  
  struct ibmvnic_stat {
  	char name[ETH_GSTRING_LEN];
  	int offset;
  };
  
  #define IBMVNIC_STAT_OFF(stat) (offsetof(struct ibmvnic_adapter, stats) + \
  			     offsetof(struct ibmvnic_statistics, stat))
  #define IBMVNIC_GET_STAT(a, off) (*((u64 *)(((unsigned long)(a)) + (off))))
  
  static const struct ibmvnic_stat ibmvnic_stats[] = {
  	{"rx_packets", IBMVNIC_STAT_OFF(rx_packets)},
  	{"rx_bytes", IBMVNIC_STAT_OFF(rx_bytes)},
  	{"tx_packets", IBMVNIC_STAT_OFF(tx_packets)},
  	{"tx_bytes", IBMVNIC_STAT_OFF(tx_bytes)},
  	{"ucast_tx_packets", IBMVNIC_STAT_OFF(ucast_tx_packets)},
  	{"ucast_rx_packets", IBMVNIC_STAT_OFF(ucast_rx_packets)},
  	{"mcast_tx_packets", IBMVNIC_STAT_OFF(mcast_tx_packets)},
  	{"mcast_rx_packets", IBMVNIC_STAT_OFF(mcast_rx_packets)},
  	{"bcast_tx_packets", IBMVNIC_STAT_OFF(bcast_tx_packets)},
  	{"bcast_rx_packets", IBMVNIC_STAT_OFF(bcast_rx_packets)},
  	{"align_errors", IBMVNIC_STAT_OFF(align_errors)},
  	{"fcs_errors", IBMVNIC_STAT_OFF(fcs_errors)},
  	{"single_collision_frames", IBMVNIC_STAT_OFF(single_collision_frames)},
  	{"multi_collision_frames", IBMVNIC_STAT_OFF(multi_collision_frames)},
  	{"sqe_test_errors", IBMVNIC_STAT_OFF(sqe_test_errors)},
  	{"deferred_tx", IBMVNIC_STAT_OFF(deferred_tx)},
  	{"late_collisions", IBMVNIC_STAT_OFF(late_collisions)},
  	{"excess_collisions", IBMVNIC_STAT_OFF(excess_collisions)},
  	{"internal_mac_tx_errors", IBMVNIC_STAT_OFF(internal_mac_tx_errors)},
  	{"carrier_sense", IBMVNIC_STAT_OFF(carrier_sense)},
  	{"too_long_frames", IBMVNIC_STAT_OFF(too_long_frames)},
  	{"internal_mac_rx_errors", IBMVNIC_STAT_OFF(internal_mac_rx_errors)},
  };
  
  static int send_crq_init_complete(struct ibmvnic_adapter *adapter)
  {
  	union ibmvnic_crq crq;
  
  	memset(&crq, 0, sizeof(crq));
  	crq.generic.first = IBMVNIC_CRQ_INIT_CMD;
  	crq.generic.cmd = IBMVNIC_CRQ_INIT_COMPLETE;
  
  	return ibmvnic_send_crq(adapter, &crq);
  }
  
  static int send_version_xchg(struct ibmvnic_adapter *adapter)
  {
  	union ibmvnic_crq crq;
  
  	memset(&crq, 0, sizeof(crq));
  	crq.version_exchange.first = IBMVNIC_CRQ_CMD;
  	crq.version_exchange.cmd = VERSION_EXCHANGE;
  	crq.version_exchange.version = cpu_to_be16(ibmvnic_version);
  
  	return ibmvnic_send_crq(adapter, &crq);
  }
  
  static long h_reg_sub_crq(unsigned long unit_address, unsigned long token,
  			  unsigned long length, unsigned long *number,
  			  unsigned long *irq)
  {
  	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
  	long rc;
  
  	rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, token, length);
  	*number = retbuf[0];
  	*irq = retbuf[1];
  
  	return rc;
  }
  
  /**
   * ibmvnic_wait_for_completion - Check device state and wait for completion
   * @adapter: private device data
   * @comp_done: completion structure to wait for
   * @timeout: time to wait in milliseconds
   *
   * Wait for a completion signal or until the timeout limit is reached
   * while checking that the device is still active.
   */
  static int ibmvnic_wait_for_completion(struct ibmvnic_adapter *adapter,
  				       struct completion *comp_done,
  				       unsigned long timeout)
  {
  	struct net_device *netdev;
  	unsigned long div_timeout;
  	u8 retry;
  
  	netdev = adapter->netdev;
  	retry = 5;
  	div_timeout = msecs_to_jiffies(timeout / retry);
  	while (true) {
  		if (!adapter->crq.active) {
  			netdev_err(netdev, "Device down!\n");
  			return -ENODEV;
  		}
  		if (!retry--)
  			break;
  		if (wait_for_completion_timeout(comp_done, div_timeout))
  			return 0;
  	}
  	netdev_err(netdev, "Operation timed out.\n");
  	return -ETIMEDOUT;
  }
  
  static int alloc_long_term_buff(struct ibmvnic_adapter *adapter,
  				struct ibmvnic_long_term_buff *ltb, int size)
  {
  	struct device *dev = &adapter->vdev->dev;
  	int rc;
  
  	ltb->size = size;
  	ltb->buff = dma_alloc_coherent(dev, ltb->size, &ltb->addr,
  				       GFP_KERNEL);
  
  	if (!ltb->buff) {
  		dev_err(dev, "Couldn't alloc long term buffer\n");
  		return -ENOMEM;
  	}
  	ltb->map_id = adapter->map_id;
  	adapter->map_id++;
  
  	mutex_lock(&adapter->fw_lock);
  	adapter->fw_done_rc = 0;
  	reinit_completion(&adapter->fw_done);
  
  	rc = send_request_map(adapter, ltb->addr, ltb->size, ltb->map_id);
  	if (rc) {
  		dev_err(dev, "send_request_map failed, rc = %d\n", rc);
  		goto out;
  	}
  
  	rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
  	if (rc) {
  		dev_err(dev,
  			"Long term map request aborted or timed out,rc = %d\n",
  			rc);
  		goto out;
  	}
  
  	if (adapter->fw_done_rc) {
  		dev_err(dev, "Couldn't map long term buffer,rc = %d\n",
  			adapter->fw_done_rc);
  		rc = -1;
  		goto out;
  	}
  	rc = 0;
  out:
  	if (rc) {
  		dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
  		ltb->buff = NULL;
  	}
  	mutex_unlock(&adapter->fw_lock);
  	return rc;
  }
  
  static void free_long_term_buff(struct ibmvnic_adapter *adapter,
  				struct ibmvnic_long_term_buff *ltb)
  {
  	struct device *dev = &adapter->vdev->dev;
  
  	if (!ltb->buff)
  		return;
  
  	/* VIOS automatically unmaps the long term buffer at remote
  	 * end for the following resets:
  	 * FAILOVER, MOBILITY, TIMEOUT.
  	 */
  	if (adapter->reset_reason != VNIC_RESET_FAILOVER &&
  	    adapter->reset_reason != VNIC_RESET_MOBILITY &&
  	    adapter->reset_reason != VNIC_RESET_TIMEOUT)
  		send_request_unmap(adapter, ltb->map_id);
  	dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
  	ltb->buff = NULL;
  	ltb->map_id = 0;
  }
  
  static int reset_long_term_buff(struct ibmvnic_adapter *adapter,
  				struct ibmvnic_long_term_buff *ltb)
  {
  	struct device *dev = &adapter->vdev->dev;
  	int rc;
  
  	memset(ltb->buff, 0, ltb->size);
  
  	mutex_lock(&adapter->fw_lock);
  	adapter->fw_done_rc = 0;
  
  	reinit_completion(&adapter->fw_done);
  	rc = send_request_map(adapter, ltb->addr, ltb->size, ltb->map_id);
  	if (rc) {
  		mutex_unlock(&adapter->fw_lock);
  		return rc;
  	}
  
  	rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
  	if (rc) {
  		dev_info(dev,
  			 "Reset failed, long term map request timed out or aborted\n");
  		mutex_unlock(&adapter->fw_lock);
  		return rc;
  	}
  
  	if (adapter->fw_done_rc) {
  		dev_info(dev,
  			 "Reset failed, attempting to free and reallocate buffer\n");
  		free_long_term_buff(adapter, ltb);
  		mutex_unlock(&adapter->fw_lock);
  		return alloc_long_term_buff(adapter, ltb, ltb->size);
  	}
  	mutex_unlock(&adapter->fw_lock);
  	return 0;
  }
  
  static void deactivate_rx_pools(struct ibmvnic_adapter *adapter)
  {
  	int i;
  
  	for (i = 0; i < adapter->num_active_rx_pools; i++)
  		adapter->rx_pool[i].active = 0;
  }
  
  static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
  			      struct ibmvnic_rx_pool *pool)
  {
  	int count = pool->size - atomic_read(&pool->available);
  	u64 handle = adapter->rx_scrq[pool->index]->handle;
  	struct device *dev = &adapter->vdev->dev;
  	struct ibmvnic_ind_xmit_queue *ind_bufp;
  	struct ibmvnic_sub_crq_queue *rx_scrq;
  	union sub_crq *sub_crq;
  	int buffers_added = 0;
  	unsigned long lpar_rc;
  	struct sk_buff *skb;
  	unsigned int offset;
  	dma_addr_t dma_addr;
  	unsigned char *dst;
  	int shift = 0;
  	int index;
  	int i;
  
  	if (!pool->active)
  		return;
  
  	rx_scrq = adapter->rx_scrq[pool->index];
  	ind_bufp = &rx_scrq->ind_buf;
  
  	/* netdev_skb_alloc() could have failed after we saved a few skbs
  	 * in the indir_buf and we would not have sent them to VIOS yet.
  	 * To account for them, start the loop at ind_bufp->index rather
  	 * than 0. If we pushed all the skbs to VIOS, ind_bufp->index will
  	 * be 0.
  	 */
  	for (i = ind_bufp->index; i < count; ++i) {
  		skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
  		if (!skb) {
  			dev_err(dev, "Couldn't replenish rx buff\n");
  			adapter->replenish_no_mem++;
  			break;
  		}
  
  		index = pool->free_map[pool->next_free];
  
  		if (pool->rx_buff[index].skb)
  			dev_err(dev, "Inconsistent free_map!\n");
  
  		/* Copy the skb to the long term mapped DMA buffer */
  		offset = index * pool->buff_size;
  		dst = pool->long_term_buff.buff + offset;
  		memset(dst, 0, pool->buff_size);
  		dma_addr = pool->long_term_buff.addr + offset;
  		pool->rx_buff[index].data = dst;
  
  		pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP;
  		pool->rx_buff[index].dma = dma_addr;
  		pool->rx_buff[index].skb = skb;
  		pool->rx_buff[index].pool_index = pool->index;
  		pool->rx_buff[index].size = pool->buff_size;
  
  		sub_crq = &ind_bufp->indir_arr[ind_bufp->index++];
  		memset(sub_crq, 0, sizeof(*sub_crq));
  		sub_crq->rx_add.first = IBMVNIC_CRQ_CMD;
  		sub_crq->rx_add.correlator =
  		    cpu_to_be64((u64)&pool->rx_buff[index]);
  		sub_crq->rx_add.ioba = cpu_to_be32(dma_addr);
  		sub_crq->rx_add.map_id = pool->long_term_buff.map_id;
  
  		/* The length field of the sCRQ is defined to be 24 bits so the
  		 * buffer size needs to be left shifted by a byte before it is
  		 * converted to big endian to prevent the last byte from being
  		 * truncated.
  		 */
  #ifdef __LITTLE_ENDIAN__
  		shift = 8;
  #endif
  		sub_crq->rx_add.len = cpu_to_be32(pool->buff_size << shift);
  		pool->next_free = (pool->next_free + 1) % pool->size;
  		if (ind_bufp->index == IBMVNIC_MAX_IND_DESCS ||
  		    i == count - 1) {
  			lpar_rc =
  				send_subcrq_indirect(adapter, handle,
  						     (u64)ind_bufp->indir_dma,
  						     (u64)ind_bufp->index);
  			if (lpar_rc != H_SUCCESS)
  				goto failure;
  			buffers_added += ind_bufp->index;
  			adapter->replenish_add_buff_success += ind_bufp->index;
  			ind_bufp->index = 0;
  		}
  	}
  	atomic_add(buffers_added, &pool->available);
  	return;
  
  failure:
  	if (lpar_rc != H_PARAMETER && lpar_rc != H_CLOSED)
  		dev_err_ratelimited(dev, "rx: replenish packet buffer failed\n");
  	for (i = ind_bufp->index - 1; i >= 0; --i) {
  		struct ibmvnic_rx_buff *rx_buff;
  
  		pool->next_free = pool->next_free == 0 ?
  				  pool->size - 1 : pool->next_free - 1;
  		sub_crq = &ind_bufp->indir_arr[i];
  		rx_buff = (struct ibmvnic_rx_buff *)
  				be64_to_cpu(sub_crq->rx_add.correlator);
  		index = (int)(rx_buff - pool->rx_buff);
  		pool->free_map[pool->next_free] = index;
  		dev_kfree_skb_any(pool->rx_buff[index].skb);
  		pool->rx_buff[index].skb = NULL;
  	}
  	adapter->replenish_add_buff_failure += ind_bufp->index;
  	atomic_add(buffers_added, &pool->available);
  	ind_bufp->index = 0;
  	if (lpar_rc == H_CLOSED || adapter->failover_pending) {
  		/* Disable buffer pool replenishment and report carrier off if
  		 * queue is closed or pending failover.
  		 * Firmware guarantees that a signal will be sent to the
  		 * driver, triggering a reset.
  		 */
  		deactivate_rx_pools(adapter);
  		netif_carrier_off(adapter->netdev);
  	}
  }
  
  static void replenish_pools(struct ibmvnic_adapter *adapter)
  {
  	int i;
  
  	adapter->replenish_task_cycles++;
  	for (i = 0; i < adapter->num_active_rx_pools; i++) {
  		if (adapter->rx_pool[i].active)
  			replenish_rx_pool(adapter, &adapter->rx_pool[i]);
  	}
  
  	netdev_dbg(adapter->netdev, "Replenished %d pools\n", i);
  }
  
  static void release_stats_buffers(struct ibmvnic_adapter *adapter)
  {
  	kfree(adapter->tx_stats_buffers);
  	kfree(adapter->rx_stats_buffers);
  	adapter->tx_stats_buffers = NULL;
  	adapter->rx_stats_buffers = NULL;
  }
  
  static int init_stats_buffers(struct ibmvnic_adapter *adapter)
  {
  	adapter->tx_stats_buffers =
  				kcalloc(IBMVNIC_MAX_QUEUES,
  					sizeof(struct ibmvnic_tx_queue_stats),
  					GFP_KERNEL);
  	if (!adapter->tx_stats_buffers)
  		return -ENOMEM;
  
  	adapter->rx_stats_buffers =
  				kcalloc(IBMVNIC_MAX_QUEUES,
  					sizeof(struct ibmvnic_rx_queue_stats),
  					GFP_KERNEL);
  	if (!adapter->rx_stats_buffers)
  		return -ENOMEM;
  
  	return 0;
  }
  
  static void release_stats_token(struct ibmvnic_adapter *adapter)
  {
  	struct device *dev = &adapter->vdev->dev;
  
  	if (!adapter->stats_token)
  		return;
  
  	dma_unmap_single(dev, adapter->stats_token,
  			 sizeof(struct ibmvnic_statistics),
  			 DMA_FROM_DEVICE);
  	adapter->stats_token = 0;
  }
  
  static int init_stats_token(struct ibmvnic_adapter *adapter)
  {
  	struct device *dev = &adapter->vdev->dev;
  	dma_addr_t stok;
  
  	stok = dma_map_single(dev, &adapter->stats,
  			      sizeof(struct ibmvnic_statistics),
  			      DMA_FROM_DEVICE);
  	if (dma_mapping_error(dev, stok)) {
  		dev_err(dev, "Couldn't map stats buffer\n");
  		return -1;
  	}
  
  	adapter->stats_token = stok;
  	netdev_dbg(adapter->netdev, "Stats token initialized (%llx)\n", stok);
  	return 0;
  }
  
  static int reset_rx_pools(struct ibmvnic_adapter *adapter)
  {
  	struct ibmvnic_rx_pool *rx_pool;
  	u64 buff_size;
  	int rx_scrqs;
  	int i, j, rc;
  
  	if (!adapter->rx_pool)
  		return -1;
  
  	buff_size = adapter->cur_rx_buf_sz;
  	rx_scrqs = adapter->num_active_rx_pools;
  	for (i = 0; i < rx_scrqs; i++) {
  		rx_pool = &adapter->rx_pool[i];
  
  		netdev_dbg(adapter->netdev, "Re-setting rx_pool[%d]\n", i);
  
  		if (rx_pool->buff_size != buff_size) {
  			free_long_term_buff(adapter, &rx_pool->long_term_buff);
  			rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
  			rc = alloc_long_term_buff(adapter,
  						  &rx_pool->long_term_buff,
  						  rx_pool->size *
  						  rx_pool->buff_size);
  		} else {
  			rc = reset_long_term_buff(adapter,
  						  &rx_pool->long_term_buff);
  		}
  
  		if (rc)
  			return rc;
  
  		for (j = 0; j < rx_pool->size; j++)
  			rx_pool->free_map[j] = j;
  
  		memset(rx_pool->rx_buff, 0,
  		       rx_pool->size * sizeof(struct ibmvnic_rx_buff));
  
  		atomic_set(&rx_pool->available, 0);
  		rx_pool->next_alloc = 0;
  		rx_pool->next_free = 0;
  		rx_pool->active = 1;
  	}
  
  	return 0;
  }
  
  static void release_rx_pools(struct ibmvnic_adapter *adapter)
  {
  	struct ibmvnic_rx_pool *rx_pool;
  	int i, j;
  
  	if (!adapter->rx_pool)
  		return;
  
  	for (i = 0; i < adapter->num_active_rx_pools; i++) {
  		rx_pool = &adapter->rx_pool[i];
  
  		netdev_dbg(adapter->netdev, "Releasing rx_pool[%d]\n", i);
  
  		kfree(rx_pool->free_map);
  		free_long_term_buff(adapter, &rx_pool->long_term_buff);
  
  		if (!rx_pool->rx_buff)
  			continue;
  
  		for (j = 0; j < rx_pool->size; j++) {
  			if (rx_pool->rx_buff[j].skb) {
  				dev_kfree_skb_any(rx_pool->rx_buff[j].skb);
  				rx_pool->rx_buff[j].skb = NULL;
  			}
  		}
  
  		kfree(rx_pool->rx_buff);
  	}
  
  	kfree(adapter->rx_pool);
  	adapter->rx_pool = NULL;
  	adapter->num_active_rx_pools = 0;
  }
  
  static int init_rx_pools(struct net_device *netdev)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	struct device *dev = &adapter->vdev->dev;
  	struct ibmvnic_rx_pool *rx_pool;
  	int rxadd_subcrqs;
  	u64 buff_size;
  	int i, j;
  
  	rxadd_subcrqs = adapter->num_active_rx_scrqs;
  	buff_size = adapter->cur_rx_buf_sz;
  
  	adapter->rx_pool = kcalloc(rxadd_subcrqs,
  				   sizeof(struct ibmvnic_rx_pool),
  				   GFP_KERNEL);
  	if (!adapter->rx_pool) {
  		dev_err(dev, "Failed to allocate rx pools\n");
  		return -1;
  	}
  
  	adapter->num_active_rx_pools = rxadd_subcrqs;
  
  	for (i = 0; i < rxadd_subcrqs; i++) {
  		rx_pool = &adapter->rx_pool[i];
  
  		netdev_dbg(adapter->netdev,
  			   "Initializing rx_pool[%d], %lld buffs, %lld bytes each\n",
  			   i, adapter->req_rx_add_entries_per_subcrq,
  			   buff_size);
  
  		rx_pool->size = adapter->req_rx_add_entries_per_subcrq;
  		rx_pool->index = i;
  		rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
  		rx_pool->active = 1;
  
  		rx_pool->free_map = kcalloc(rx_pool->size, sizeof(int),
  					    GFP_KERNEL);
  		if (!rx_pool->free_map) {
  			release_rx_pools(adapter);
  			return -1;
  		}
  
  		rx_pool->rx_buff = kcalloc(rx_pool->size,
  					   sizeof(struct ibmvnic_rx_buff),
  					   GFP_KERNEL);
  		if (!rx_pool->rx_buff) {
  			dev_err(dev, "Couldn't alloc rx buffers\n");
  			release_rx_pools(adapter);
  			return -1;
  		}
  
  		if (alloc_long_term_buff(adapter, &rx_pool->long_term_buff,
  					 rx_pool->size * rx_pool->buff_size)) {
  			release_rx_pools(adapter);
  			return -1;
  		}
  
  		for (j = 0; j < rx_pool->size; ++j)
  			rx_pool->free_map[j] = j;
  
  		atomic_set(&rx_pool->available, 0);
  		rx_pool->next_alloc = 0;
  		rx_pool->next_free = 0;
  	}
  
  	return 0;
  }
  
  static int reset_one_tx_pool(struct ibmvnic_adapter *adapter,
  			     struct ibmvnic_tx_pool *tx_pool)
  {
  	int rc, i;
  
  	rc = reset_long_term_buff(adapter, &tx_pool->long_term_buff);
  	if (rc)
  		return rc;
  
  	memset(tx_pool->tx_buff, 0,
  	       tx_pool->num_buffers *
  	       sizeof(struct ibmvnic_tx_buff));
  
  	for (i = 0; i < tx_pool->num_buffers; i++)
  		tx_pool->free_map[i] = i;
  
  	tx_pool->consumer_index = 0;
  	tx_pool->producer_index = 0;
  
  	return 0;
  }
  
  static int reset_tx_pools(struct ibmvnic_adapter *adapter)
  {
  	int tx_scrqs;
  	int i, rc;
  
  	if (!adapter->tx_pool)
  		return -1;
  
  	tx_scrqs = adapter->num_active_tx_pools;
  	for (i = 0; i < tx_scrqs; i++) {
  		ibmvnic_tx_scrq_clean_buffer(adapter, adapter->tx_scrq[i]);
  		rc = reset_one_tx_pool(adapter, &adapter->tso_pool[i]);
  		if (rc)
  			return rc;
  		rc = reset_one_tx_pool(adapter, &adapter->tx_pool[i]);
  		if (rc)
  			return rc;
  	}
  
  	return 0;
  }
  
  static void release_vpd_data(struct ibmvnic_adapter *adapter)
  {
  	if (!adapter->vpd)
  		return;
  
  	kfree(adapter->vpd->buff);
  	kfree(adapter->vpd);
  
  	adapter->vpd = NULL;
  }
  
  static void release_one_tx_pool(struct ibmvnic_adapter *adapter,
  				struct ibmvnic_tx_pool *tx_pool)
  {
  	kfree(tx_pool->tx_buff);
  	kfree(tx_pool->free_map);
  	free_long_term_buff(adapter, &tx_pool->long_term_buff);
  }
  
  static void release_tx_pools(struct ibmvnic_adapter *adapter)
  {
  	int i;
  
  	if (!adapter->tx_pool)
  		return;
  
  	for (i = 0; i < adapter->num_active_tx_pools; i++) {
  		release_one_tx_pool(adapter, &adapter->tx_pool[i]);
  		release_one_tx_pool(adapter, &adapter->tso_pool[i]);
  	}
  
  	kfree(adapter->tx_pool);
  	adapter->tx_pool = NULL;
  	kfree(adapter->tso_pool);
  	adapter->tso_pool = NULL;
  	adapter->num_active_tx_pools = 0;
  }
  
  static int init_one_tx_pool(struct net_device *netdev,
  			    struct ibmvnic_tx_pool *tx_pool,
  			    int num_entries, int buf_size)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	int i;
  
  	tx_pool->tx_buff = kcalloc(num_entries,
  				   sizeof(struct ibmvnic_tx_buff),
  				   GFP_KERNEL);
  	if (!tx_pool->tx_buff)
  		return -1;
  
  	if (alloc_long_term_buff(adapter, &tx_pool->long_term_buff,
  				 num_entries * buf_size))
  		return -1;
  
  	tx_pool->free_map = kcalloc(num_entries, sizeof(int), GFP_KERNEL);
  	if (!tx_pool->free_map)
  		return -1;
  
  	for (i = 0; i < num_entries; i++)
  		tx_pool->free_map[i] = i;
  
  	tx_pool->consumer_index = 0;
  	tx_pool->producer_index = 0;
  	tx_pool->num_buffers = num_entries;
  	tx_pool->buf_size = buf_size;
  
  	return 0;
  }
  
  static int init_tx_pools(struct net_device *netdev)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	int tx_subcrqs;
  	u64 buff_size;
  	int i, rc;
  
  	tx_subcrqs = adapter->num_active_tx_scrqs;
  	adapter->tx_pool = kcalloc(tx_subcrqs,
  				   sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
  	if (!adapter->tx_pool)
  		return -1;
  
  	adapter->tso_pool = kcalloc(tx_subcrqs,
  				    sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
  	if (!adapter->tso_pool) {
  		kfree(adapter->tx_pool);
  		adapter->tx_pool = NULL;
  		return -1;
  	}
  
  	adapter->num_active_tx_pools = tx_subcrqs;
  
  	for (i = 0; i < tx_subcrqs; i++) {
  		buff_size = adapter->req_mtu + VLAN_HLEN;
  		buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
  		rc = init_one_tx_pool(netdev, &adapter->tx_pool[i],
  				      adapter->req_tx_entries_per_subcrq,
  				      buff_size);
  		if (rc) {
  			release_tx_pools(adapter);
  			return rc;
  		}
  
  		rc = init_one_tx_pool(netdev, &adapter->tso_pool[i],
  				      IBMVNIC_TSO_BUFS,
  				      IBMVNIC_TSO_BUF_SZ);
  		if (rc) {
  			release_tx_pools(adapter);
  			return rc;
  		}
  	}
  
  	return 0;
  }
  
  static void ibmvnic_napi_enable(struct ibmvnic_adapter *adapter)
  {
  	int i;
  
  	if (adapter->napi_enabled)
  		return;
  
  	for (i = 0; i < adapter->req_rx_queues; i++)
  		napi_enable(&adapter->napi[i]);
  
  	adapter->napi_enabled = true;
  }
  
  static void ibmvnic_napi_disable(struct ibmvnic_adapter *adapter)
  {
  	int i;
  
  	if (!adapter->napi_enabled)
  		return;
  
  	for (i = 0; i < adapter->req_rx_queues; i++) {
  		netdev_dbg(adapter->netdev, "Disabling napi[%d]\n", i);
  		napi_disable(&adapter->napi[i]);
  	}
  
  	adapter->napi_enabled = false;
  }
  
  static int init_napi(struct ibmvnic_adapter *adapter)
  {
  	int i;
  
  	adapter->napi = kcalloc(adapter->req_rx_queues,
  				sizeof(struct napi_struct), GFP_KERNEL);
  	if (!adapter->napi)
  		return -ENOMEM;
  
  	for (i = 0; i < adapter->req_rx_queues; i++) {
  		netdev_dbg(adapter->netdev, "Adding napi[%d]\n", i);
  		netif_napi_add(adapter->netdev, &adapter->napi[i],
  			       ibmvnic_poll, NAPI_POLL_WEIGHT);
  	}
  
  	adapter->num_active_rx_napi = adapter->req_rx_queues;
  	return 0;
  }
  
  static void release_napi(struct ibmvnic_adapter *adapter)
  {
  	int i;
  
  	if (!adapter->napi)
  		return;
  
  	for (i = 0; i < adapter->num_active_rx_napi; i++) {
  		netdev_dbg(adapter->netdev, "Releasing napi[%d]\n", i);
  		netif_napi_del(&adapter->napi[i]);
  	}
  
  	kfree(adapter->napi);
  	adapter->napi = NULL;
  	adapter->num_active_rx_napi = 0;
  	adapter->napi_enabled = false;
  }
  
  static const char *adapter_state_to_string(enum vnic_state state)
  {
  	switch (state) {
  	case VNIC_PROBING:
  		return "PROBING";
  	case VNIC_PROBED:
  		return "PROBED";
  	case VNIC_OPENING:
  		return "OPENING";
  	case VNIC_OPEN:
  		return "OPEN";
  	case VNIC_CLOSING:
  		return "CLOSING";
  	case VNIC_CLOSED:
  		return "CLOSED";
  	case VNIC_REMOVING:
  		return "REMOVING";
  	case VNIC_REMOVED:
  		return "REMOVED";
  	case VNIC_DOWN:
  		return "DOWN";
  	}
  	return "UNKNOWN";
  }
  
  static int ibmvnic_login(struct net_device *netdev)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	unsigned long timeout = msecs_to_jiffies(20000);
  	int retry_count = 0;
  	int retries = 10;
  	bool retry;
  	int rc;
  
  	do {
  		retry = false;
  		if (retry_count > retries) {
  			netdev_warn(netdev, "Login attempts exceeded\n");
  			return -1;
  		}
  
  		adapter->init_done_rc = 0;
  		reinit_completion(&adapter->init_done);
  		rc = send_login(adapter);
  		if (rc)
  			return rc;
  
  		if (!wait_for_completion_timeout(&adapter->init_done,
  						 timeout)) {
  			netdev_warn(netdev, "Login timed out, retrying...\n");
  			retry = true;
  			adapter->init_done_rc = 0;
  			retry_count++;
  			continue;
  		}
  
  		if (adapter->init_done_rc == ABORTED) {
  			netdev_warn(netdev, "Login aborted, retrying...\n");
  			retry = true;
  			adapter->init_done_rc = 0;
  			retry_count++;
  			/* FW or device may be busy, so
  			 * wait a bit before retrying login
  			 */
  			msleep(500);
  		} else if (adapter->init_done_rc == PARTIALSUCCESS) {
  			retry_count++;
  			release_sub_crqs(adapter, 1);
  
  			retry = true;
  			netdev_dbg(netdev,
  				   "Received partial success, retrying...\n");
  			adapter->init_done_rc = 0;
  			reinit_completion(&adapter->init_done);
  			send_query_cap(adapter);
  			if (!wait_for_completion_timeout(&adapter->init_done,
  							 timeout)) {
  				netdev_warn(netdev,
  					    "Capabilities query timed out\n");
  				return -1;
  			}
  
  			rc = init_sub_crqs(adapter);
  			if (rc) {
  				netdev_warn(netdev,
  					    "SCRQ initialization failed\n");
  				return -1;
  			}
  
  			rc = init_sub_crq_irqs(adapter);
  			if (rc) {
  				netdev_warn(netdev,
  					    "SCRQ irq initialization failed\n");
  				return -1;
  			}
  		} else if (adapter->init_done_rc) {
  			netdev_warn(netdev, "Adapter login failed\n");
  			return -1;
  		}
  	} while (retry);
  
  	__ibmvnic_set_mac(netdev, adapter->mac_addr);
  
  	netdev_dbg(netdev, "[S:%s] Login succeeded\n", adapter_state_to_string(adapter->state));
  	return 0;
  }
  
  static void release_login_buffer(struct ibmvnic_adapter *adapter)
  {
  	kfree(adapter->login_buf);
  	adapter->login_buf = NULL;
  }
  
  static void release_login_rsp_buffer(struct ibmvnic_adapter *adapter)
  {
  	kfree(adapter->login_rsp_buf);
  	adapter->login_rsp_buf = NULL;
  }
  
  static void release_resources(struct ibmvnic_adapter *adapter)
  {
  	release_vpd_data(adapter);
  
  	release_tx_pools(adapter);
  	release_rx_pools(adapter);
  
  	release_napi(adapter);
  	release_login_buffer(adapter);
  	release_login_rsp_buffer(adapter);
  }
  
  static int set_link_state(struct ibmvnic_adapter *adapter, u8 link_state)
  {
  	struct net_device *netdev = adapter->netdev;
  	unsigned long timeout = msecs_to_jiffies(20000);
  	union ibmvnic_crq crq;
  	bool resend;
  	int rc;
  
  	netdev_dbg(netdev, "setting link state %d\n", link_state);
  
  	memset(&crq, 0, sizeof(crq));
  	crq.logical_link_state.first = IBMVNIC_CRQ_CMD;
  	crq.logical_link_state.cmd = LOGICAL_LINK_STATE;
  	crq.logical_link_state.link_state = link_state;
  
  	do {
  		resend = false;
  
  		reinit_completion(&adapter->init_done);
  		rc = ibmvnic_send_crq(adapter, &crq);
  		if (rc) {
  			netdev_err(netdev, "Failed to set link state\n");
  			return rc;
  		}
  
  		if (!wait_for_completion_timeout(&adapter->init_done,
  						 timeout)) {
  			netdev_err(netdev, "timeout setting link state\n");
  			return -1;
  		}
  
  		if (adapter->init_done_rc == PARTIALSUCCESS) {
  			/* Partuial success, delay and re-send */
  			mdelay(1000);
  			resend = true;
  		} else if (adapter->init_done_rc) {
  			netdev_warn(netdev, "Unable to set link state, rc=%d\n",
  				    adapter->init_done_rc);
  			return adapter->init_done_rc;
  		}
  	} while (resend);
  
  	return 0;
  }
  
  static int set_real_num_queues(struct net_device *netdev)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	int rc;
  
  	netdev_dbg(netdev, "Setting real tx/rx queues (%llx/%llx)\n",
  		   adapter->req_tx_queues, adapter->req_rx_queues);
  
  	rc = netif_set_real_num_tx_queues(netdev, adapter->req_tx_queues);
  	if (rc) {
  		netdev_err(netdev, "failed to set the number of tx queues\n");
  		return rc;
  	}
  
  	rc = netif_set_real_num_rx_queues(netdev, adapter->req_rx_queues);
  	if (rc)
  		netdev_err(netdev, "failed to set the number of rx queues\n");
  
  	return rc;
  }
  
  static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter)
  {
  	struct device *dev = &adapter->vdev->dev;
  	union ibmvnic_crq crq;
  	int len = 0;
  	int rc;
  
  	if (adapter->vpd->buff)
  		len = adapter->vpd->len;
  
  	mutex_lock(&adapter->fw_lock);
  	adapter->fw_done_rc = 0;
  	reinit_completion(&adapter->fw_done);
  
  	crq.get_vpd_size.first = IBMVNIC_CRQ_CMD;
  	crq.get_vpd_size.cmd = GET_VPD_SIZE;
  	rc = ibmvnic_send_crq(adapter, &crq);
  	if (rc) {
  		mutex_unlock(&adapter->fw_lock);
  		return rc;
  	}
  
  	rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
  	if (rc) {
  		dev_err(dev, "Could not retrieve VPD size, rc = %d\n", rc);
  		mutex_unlock(&adapter->fw_lock);
  		return rc;
  	}
  	mutex_unlock(&adapter->fw_lock);
  
  	if (!adapter->vpd->len)
  		return -ENODATA;
  
  	if (!adapter->vpd->buff)
  		adapter->vpd->buff = kzalloc(adapter->vpd->len, GFP_KERNEL);
  	else if (adapter->vpd->len != len)
  		adapter->vpd->buff =
  			krealloc(adapter->vpd->buff,
  				 adapter->vpd->len, GFP_KERNEL);
  
  	if (!adapter->vpd->buff) {
  		dev_err(dev, "Could allocate VPD buffer\n");
  		return -ENOMEM;
  	}
  
  	adapter->vpd->dma_addr =
  		dma_map_single(dev, adapter->vpd->buff, adapter->vpd->len,
  			       DMA_FROM_DEVICE);
  	if (dma_mapping_error(dev, adapter->vpd->dma_addr)) {
  		dev_err(dev, "Could not map VPD buffer\n");
  		kfree(adapter->vpd->buff);
  		adapter->vpd->buff = NULL;
  		return -ENOMEM;
  	}
  
  	mutex_lock(&adapter->fw_lock);
  	adapter->fw_done_rc = 0;
  	reinit_completion(&adapter->fw_done);
  
  	crq.get_vpd.first = IBMVNIC_CRQ_CMD;
  	crq.get_vpd.cmd = GET_VPD;
  	crq.get_vpd.ioba = cpu_to_be32(adapter->vpd->dma_addr);
  	crq.get_vpd.len = cpu_to_be32((u32)adapter->vpd->len);
  	rc = ibmvnic_send_crq(adapter, &crq);
  	if (rc) {
  		kfree(adapter->vpd->buff);
  		adapter->vpd->buff = NULL;
  		mutex_unlock(&adapter->fw_lock);
  		return rc;
  	}
  
  	rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
  	if (rc) {
  		dev_err(dev, "Unable to retrieve VPD, rc = %d\n", rc);
  		kfree(adapter->vpd->buff);
  		adapter->vpd->buff = NULL;
  		mutex_unlock(&adapter->fw_lock);
  		return rc;
  	}
  
  	mutex_unlock(&adapter->fw_lock);
  	return 0;
  }
  
  static int init_resources(struct ibmvnic_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	int rc;
  
  	rc = set_real_num_queues(netdev);
  	if (rc)
  		return rc;
  
  	adapter->vpd = kzalloc(sizeof(*adapter->vpd), GFP_KERNEL);
  	if (!adapter->vpd)
  		return -ENOMEM;
  
  	/* Vital Product Data (VPD) */
  	rc = ibmvnic_get_vpd(adapter);
  	if (rc) {
  		netdev_err(netdev, "failed to initialize Vital Product Data (VPD)\n");
  		return rc;
  	}
  
  	adapter->map_id = 1;
  
  	rc = init_napi(adapter);
  	if (rc)
  		return rc;
  
  	send_query_map(adapter);
  
  	rc = init_rx_pools(netdev);
  	if (rc)
  		return rc;
  
  	rc = init_tx_pools(netdev);
  	return rc;
  }
  
  static int __ibmvnic_open(struct net_device *netdev)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	enum vnic_state prev_state = adapter->state;
  	int i, rc;
  
  	adapter->state = VNIC_OPENING;
  	replenish_pools(adapter);
  	ibmvnic_napi_enable(adapter);
  
  	/* We're ready to receive frames, enable the sub-crq interrupts and
  	 * set the logical link state to up
  	 */
  	for (i = 0; i < adapter->req_rx_queues; i++) {
  		netdev_dbg(netdev, "Enabling rx_scrq[%d] irq\n", i);
  		if (prev_state == VNIC_CLOSED)
  			enable_irq(adapter->rx_scrq[i]->irq);
  		enable_scrq_irq(adapter, adapter->rx_scrq[i]);
  	}
  
  	for (i = 0; i < adapter->req_tx_queues; i++) {
  		netdev_dbg(netdev, "Enabling tx_scrq[%d] irq\n", i);
  		if (prev_state == VNIC_CLOSED)
  			enable_irq(adapter->tx_scrq[i]->irq);
  		enable_scrq_irq(adapter, adapter->tx_scrq[i]);
  		netdev_tx_reset_queue(netdev_get_tx_queue(netdev, i));
  	}
  
  	rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_UP);
  	if (rc) {
  		ibmvnic_napi_disable(adapter);
  		release_resources(adapter);
  		return rc;
  	}
  
  	netif_tx_start_all_queues(netdev);
  
  	if (prev_state == VNIC_CLOSED) {
  		for (i = 0; i < adapter->req_rx_queues; i++)
  			napi_schedule(&adapter->napi[i]);
  	}
  
  	adapter->state = VNIC_OPEN;
  	return rc;
  }
  
  static int ibmvnic_open(struct net_device *netdev)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	int rc;
  
  	ASSERT_RTNL();
  
  	/* If device failover is pending or we are about to reset, just set
  	 * device state and return. Device operation will be handled by reset
  	 * routine.
  	 *
  	 * It should be safe to overwrite the adapter->state here. Since
  	 * we hold the rtnl, either the reset has not actually started or
  	 * the rtnl got dropped during the set_link_state() in do_reset().
  	 * In the former case, no one else is changing the state (again we
  	 * have the rtnl) and in the latter case, do_reset() will detect and
  	 * honor our setting below.
  	 */
  	if (adapter->failover_pending || (test_bit(0, &adapter->resetting))) {
  		netdev_dbg(netdev, "[S:%s FOP:%d] Resetting, deferring open\n",
  			   adapter_state_to_string(adapter->state),
  			   adapter->failover_pending);
  		adapter->state = VNIC_OPEN;
  		rc = 0;
  		goto out;
  	}
  
  	if (adapter->state != VNIC_CLOSED) {
  		rc = ibmvnic_login(netdev);
  		if (rc)
  			goto out;
  
  		rc = init_resources(adapter);
  		if (rc) {
  			netdev_err(netdev, "failed to initialize resources\n");
  			release_resources(adapter);
  			goto out;
  		}
  	}
  
  	rc = __ibmvnic_open(netdev);
  
  out:
  	/* If open failed and there is a pending failover or in-progress reset,
  	 * set device state and return. Device operation will be handled by
  	 * reset routine. See also comments above regarding rtnl.
  	 */
  	if (rc &&
  	    (adapter->failover_pending || (test_bit(0, &adapter->resetting)))) {
  		adapter->state = VNIC_OPEN;
  		rc = 0;
  	}
  	return rc;
  }
  
  static void clean_rx_pools(struct ibmvnic_adapter *adapter)
  {
  	struct ibmvnic_rx_pool *rx_pool;
  	struct ibmvnic_rx_buff *rx_buff;
  	u64 rx_entries;
  	int rx_scrqs;
  	int i, j;
  
  	if (!adapter->rx_pool)
  		return;
  
  	rx_scrqs = adapter->num_active_rx_pools;
  	rx_entries = adapter->req_rx_add_entries_per_subcrq;
  
  	/* Free any remaining skbs in the rx buffer pools */
  	for (i = 0; i < rx_scrqs; i++) {
  		rx_pool = &adapter->rx_pool[i];
  		if (!rx_pool || !rx_pool->rx_buff)
  			continue;
  
  		netdev_dbg(adapter->netdev, "Cleaning rx_pool[%d]\n", i);
  		for (j = 0; j < rx_entries; j++) {
  			rx_buff = &rx_pool->rx_buff[j];
  			if (rx_buff && rx_buff->skb) {
  				dev_kfree_skb_any(rx_buff->skb);
  				rx_buff->skb = NULL;
  			}
  		}
  	}
  }
  
  static void clean_one_tx_pool(struct ibmvnic_adapter *adapter,
  			      struct ibmvnic_tx_pool *tx_pool)
  {
  	struct ibmvnic_tx_buff *tx_buff;
  	u64 tx_entries;
  	int i;
  
  	if (!tx_pool || !tx_pool->tx_buff)
  		return;
  
  	tx_entries = tx_pool->num_buffers;
  
  	for (i = 0; i < tx_entries; i++) {
  		tx_buff = &tx_pool->tx_buff[i];
  		if (tx_buff && tx_buff->skb) {
  			dev_kfree_skb_any(tx_buff->skb);
  			tx_buff->skb = NULL;
  		}
  	}
  }
  
  static void clean_tx_pools(struct ibmvnic_adapter *adapter)
  {
  	int tx_scrqs;
  	int i;
  
  	if (!adapter->tx_pool || !adapter->tso_pool)
  		return;
  
  	tx_scrqs = adapter->num_active_tx_pools;
  
  	/* Free any remaining skbs in the tx buffer pools */
  	for (i = 0; i < tx_scrqs; i++) {
  		netdev_dbg(adapter->netdev, "Cleaning tx_pool[%d]\n", i);
  		clean_one_tx_pool(adapter, &adapter->tx_pool[i]);
  		clean_one_tx_pool(adapter, &adapter->tso_pool[i]);
  	}
  }
  
  static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	int i;
  
  	if (adapter->tx_scrq) {
  		for (i = 0; i < adapter->req_tx_queues; i++)
  			if (adapter->tx_scrq[i]->irq) {
  				netdev_dbg(netdev,
  					   "Disabling tx_scrq[%d] irq\n", i);
  				disable_scrq_irq(adapter, adapter->tx_scrq[i]);
  				disable_irq(adapter->tx_scrq[i]->irq);
  			}
  	}
  
  	if (adapter->rx_scrq) {
  		for (i = 0; i < adapter->req_rx_queues; i++) {
  			if (adapter->rx_scrq[i]->irq) {
  				netdev_dbg(netdev,
  					   "Disabling rx_scrq[%d] irq\n", i);
  				disable_scrq_irq(adapter, adapter->rx_scrq[i]);
  				disable_irq(adapter->rx_scrq[i]->irq);
  			}
  		}
  	}
  }
  
  static void ibmvnic_cleanup(struct net_device *netdev)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  
  	/* ensure that transmissions are stopped if called by do_reset */
  	if (test_bit(0, &adapter->resetting))
  		netif_tx_disable(netdev);
  	else
  		netif_tx_stop_all_queues(netdev);
  
  	ibmvnic_napi_disable(adapter);
  	ibmvnic_disable_irqs(adapter);
  
  	clean_rx_pools(adapter);
  	clean_tx_pools(adapter);
  }
  
  static int __ibmvnic_close(struct net_device *netdev)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	int rc = 0;
  
  	adapter->state = VNIC_CLOSING;
  	rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
  	adapter->state = VNIC_CLOSED;
  	return rc;
  }
  
  static int ibmvnic_close(struct net_device *netdev)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	int rc;
  
  	netdev_dbg(netdev, "[S:%s FOP:%d FRR:%d] Closing\n",
  		   adapter_state_to_string(adapter->state),
  		   adapter->failover_pending,
  		   adapter->force_reset_recovery);
  
  	/* If device failover is pending, just set device state and return.
  	 * Device operation will be handled by reset routine.
  	 */
  	if (adapter->failover_pending) {
  		adapter->state = VNIC_CLOSED;
  		return 0;
  	}
  
  	rc = __ibmvnic_close(netdev);
  	ibmvnic_cleanup(netdev);
  
  	return rc;
  }
  
  /**
   * build_hdr_data - creates L2/L3/L4 header data buffer
   * @hdr_field: bitfield determining needed headers
   * @skb: socket buffer
   * @hdr_len: array of header lengths
   * @hdr_data: buffer to write the header to
   *
   * Reads hdr_field to determine which headers are needed by firmware.
   * Builds a buffer containing these headers.  Saves individual header
   * lengths and total buffer length to be used to build descriptors.
   */
  static int build_hdr_data(u8 hdr_field, struct sk_buff *skb,
  			  int *hdr_len, u8 *hdr_data)
  {
  	int len = 0;
  	u8 *hdr;
  
  	if (skb_vlan_tagged(skb) && !skb_vlan_tag_present(skb))
  		hdr_len[0] = sizeof(struct vlan_ethhdr);
  	else
  		hdr_len[0] = sizeof(struct ethhdr);
  
  	if (skb->protocol == htons(ETH_P_IP)) {
  		hdr_len[1] = ip_hdr(skb)->ihl * 4;
  		if (ip_hdr(skb)->protocol == IPPROTO_TCP)
  			hdr_len[2] = tcp_hdrlen(skb);
  		else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
  			hdr_len[2] = sizeof(struct udphdr);
  	} else if (skb->protocol == htons(ETH_P_IPV6)) {
  		hdr_len[1] = sizeof(struct ipv6hdr);
  		if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
  			hdr_len[2] = tcp_hdrlen(skb);
  		else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
  			hdr_len[2] = sizeof(struct udphdr);
  	} else if (skb->protocol == htons(ETH_P_ARP)) {
  		hdr_len[1] = arp_hdr_len(skb->dev);
  		hdr_len[2] = 0;
  	}
  
  	memset(hdr_data, 0, 120);
  	if ((hdr_field >> 6) & 1) {
  		hdr = skb_mac_header(skb);
  		memcpy(hdr_data, hdr, hdr_len[0]);
  		len += hdr_len[0];
  	}
  
  	if ((hdr_field >> 5) & 1) {
  		hdr = skb_network_header(skb);
  		memcpy(hdr_data + len, hdr, hdr_len[1]);
  		len += hdr_len[1];
  	}
  
  	if ((hdr_field >> 4) & 1) {
  		hdr = skb_transport_header(skb);
  		memcpy(hdr_data + len, hdr, hdr_len[2]);
  		len += hdr_len[2];
  	}
  	return len;
  }
  
  /**
   * create_hdr_descs - create header and header extension descriptors
   * @hdr_field: bitfield determining needed headers
   * @hdr_data: buffer containing header data
   * @len: length of data buffer
   * @hdr_len: array of individual header lengths
   * @scrq_arr: descriptor array
   *
   * Creates header and, if needed, header extension descriptors and
   * places them in a descriptor array, scrq_arr
   */
  
  static int create_hdr_descs(u8 hdr_field, u8 *hdr_data, int len, int *hdr_len,
  			    union sub_crq *scrq_arr)
  {
  	union sub_crq hdr_desc;
  	int tmp_len = len;
  	int num_descs = 0;
  	u8 *data, *cur;
  	int tmp;
  
  	while (tmp_len > 0) {
  		cur = hdr_data + len - tmp_len;
  
  		memset(&hdr_desc, 0, sizeof(hdr_desc));
  		if (cur != hdr_data) {
  			data = hdr_desc.hdr_ext.data;
  			tmp = tmp_len > 29 ? 29 : tmp_len;
  			hdr_desc.hdr_ext.first = IBMVNIC_CRQ_CMD;
  			hdr_desc.hdr_ext.type = IBMVNIC_HDR_EXT_DESC;
  			hdr_desc.hdr_ext.len = tmp;
  		} else {
  			data = hdr_desc.hdr.data;
  			tmp = tmp_len > 24 ? 24 : tmp_len;
  			hdr_desc.hdr.first = IBMVNIC_CRQ_CMD;
  			hdr_desc.hdr.type = IBMVNIC_HDR_DESC;
  			hdr_desc.hdr.len = tmp;
  			hdr_desc.hdr.l2_len = (u8)hdr_len[0];
  			hdr_desc.hdr.l3_len = cpu_to_be16((u16)hdr_len[1]);
  			hdr_desc.hdr.l4_len = (u8)hdr_len[2];
  			hdr_desc.hdr.flag = hdr_field << 1;
  		}
  		memcpy(data, cur, tmp);
  		tmp_len -= tmp;
  		*scrq_arr = hdr_desc;
  		scrq_arr++;
  		num_descs++;
  	}
  
  	return num_descs;
  }
  
  /**
   * build_hdr_descs_arr - build a header descriptor array
   * @skb: tx socket buffer
   * @indir_arr: indirect array
   * @num_entries: number of descriptors to be sent
   * @hdr_field: bit field determining which headers will be sent
   *
   * This function will build a TX descriptor array with applicable
   * L2/L3/L4 packet header descriptors to be sent by send_subcrq_indirect.
   */
  
  static void build_hdr_descs_arr(struct sk_buff *skb,
  				union sub_crq *indir_arr,
  				int *num_entries, u8 hdr_field)
  {
  	int hdr_len[3] = {0, 0, 0};
  	u8 hdr_data[140] = {0};
  	int tot_len;
  
  	tot_len = build_hdr_data(hdr_field, skb, hdr_len,
  				 hdr_data);
  	*num_entries += create_hdr_descs(hdr_field, hdr_data, tot_len, hdr_len,
  					 indir_arr + 1);
  }
  
  static int ibmvnic_xmit_workarounds(struct sk_buff *skb,
  				    struct net_device *netdev)
  {
  	/* For some backing devices, mishandling of small packets
  	 * can result in a loss of connection or TX stall. Device
  	 * architects recommend that no packet should be smaller
  	 * than the minimum MTU value provided to the driver, so
  	 * pad any packets to that length
  	 */
  	if (skb->len < netdev->min_mtu)
  		return skb_put_padto(skb, netdev->min_mtu);
  
  	return 0;
  }
  
  static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
  					 struct ibmvnic_sub_crq_queue *tx_scrq)
  {
  	struct ibmvnic_ind_xmit_queue *ind_bufp;
  	struct ibmvnic_tx_buff *tx_buff;
  	struct ibmvnic_tx_pool *tx_pool;
  	union sub_crq tx_scrq_entry;
  	int queue_num;
  	int entries;
  	int index;
  	int i;
  
  	ind_bufp = &tx_scrq->ind_buf;
  	entries = (u64)ind_bufp->index;
  	queue_num = tx_scrq->pool_index;
  
  	for (i = entries - 1; i >= 0; --i) {
  		tx_scrq_entry = ind_bufp->indir_arr[i];
  		if (tx_scrq_entry.v1.type != IBMVNIC_TX_DESC)
  			continue;
  		index = be32_to_cpu(tx_scrq_entry.v1.correlator);
  		if (index & IBMVNIC_TSO_POOL_MASK) {
  			tx_pool = &adapter->tso_pool[queue_num];
  			index &= ~IBMVNIC_TSO_POOL_MASK;
  		} else {
  			tx_pool = &adapter->tx_pool[queue_num];
  		}
  		tx_pool->free_map[tx_pool->consumer_index] = index;
  		tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
  					  tx_pool->num_buffers - 1 :
  					  tx_pool->consumer_index - 1;
  		tx_buff = &tx_pool->tx_buff[index];
  		adapter->netdev->stats.tx_packets--;
  		adapter->netdev->stats.tx_bytes -= tx_buff->skb->len;
  		adapter->tx_stats_buffers[queue_num].packets--;
  		adapter->tx_stats_buffers[queue_num].bytes -=
  						tx_buff->skb->len;
  		dev_kfree_skb_any(tx_buff->skb);
  		tx_buff->skb = NULL;
  		adapter->netdev->stats.tx_dropped++;
  	}
  	ind_bufp->index = 0;
  	if (atomic_sub_return(entries, &tx_scrq->used) <=
  	    (adapter->req_tx_entries_per_subcrq / 2) &&
  	    __netif_subqueue_stopped(adapter->netdev, queue_num) &&
  	    !test_bit(0, &adapter->resetting)) {
  		netif_wake_subqueue(adapter->netdev, queue_num);
  		netdev_dbg(adapter->netdev, "Started queue %d\n",
  			   queue_num);
  	}
  }
  
  static int ibmvnic_tx_scrq_flush(struct ibmvnic_adapter *adapter,
  				 struct ibmvnic_sub_crq_queue *tx_scrq)
  {
  	struct ibmvnic_ind_xmit_queue *ind_bufp;
  	u64 dma_addr;
  	u64 entries;
  	u64 handle;
  	int rc;
  
  	ind_bufp = &tx_scrq->ind_buf;
  	dma_addr = (u64)ind_bufp->indir_dma;
  	entries = (u64)ind_bufp->index;
  	handle = tx_scrq->handle;
  
  	if (!entries)
  		return 0;
  	rc = send_subcrq_indirect(adapter, handle, dma_addr, entries);
  	if (rc)
  		ibmvnic_tx_scrq_clean_buffer(adapter, tx_scrq);
  	else
  		ind_bufp->index = 0;
  	return 0;
  }
  
  static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	int queue_num = skb_get_queue_mapping(skb);
  	u8 *hdrs = (u8 *)&adapter->tx_rx_desc_req;
  	struct device *dev = &adapter->vdev->dev;
  	struct ibmvnic_ind_xmit_queue *ind_bufp;
  	struct ibmvnic_tx_buff *tx_buff = NULL;
  	struct ibmvnic_sub_crq_queue *tx_scrq;
  	struct ibmvnic_tx_pool *tx_pool;
  	unsigned int tx_send_failed = 0;
  	netdev_tx_t ret = NETDEV_TX_OK;
  	unsigned int tx_map_failed = 0;
  	union sub_crq indir_arr[16];
  	unsigned int tx_dropped = 0;
  	unsigned int tx_packets = 0;
  	unsigned int tx_bytes = 0;
  	dma_addr_t data_dma_addr;
  	struct netdev_queue *txq;
  	unsigned long lpar_rc;
  	union sub_crq tx_crq;
  	unsigned int offset;
  	int num_entries = 1;
  	unsigned char *dst;
  	int index = 0;
  	u8 proto = 0;
  
  	tx_scrq = adapter->tx_scrq[queue_num];
  	txq = netdev_get_tx_queue(netdev, queue_num);
  	ind_bufp = &tx_scrq->ind_buf;
  
  	if (test_bit(0, &adapter->resetting)) {
  		dev_kfree_skb_any(skb);
  
  		tx_send_failed++;
  		tx_dropped++;
  		ret = NETDEV_TX_OK;
  		goto out;
  	}
  
  	if (ibmvnic_xmit_workarounds(skb, netdev)) {
  		tx_dropped++;
  		tx_send_failed++;
  		ret = NETDEV_TX_OK;
  		ibmvnic_tx_scrq_flush(adapter, tx_scrq);
  		goto out;
  	}
  	if (skb_is_gso(skb))
  		tx_pool = &adapter->tso_pool[queue_num];
  	else
  		tx_pool = &adapter->tx_pool[queue_num];
  
  	index = tx_pool->free_map[tx_pool->consumer_index];
  
  	if (index == IBMVNIC_INVALID_MAP) {
  		dev_kfree_skb_any(skb);
  		tx_send_failed++;
  		tx_dropped++;
  		ibmvnic_tx_scrq_flush(adapter, tx_scrq);
  		ret = NETDEV_TX_OK;
  		goto out;
  	}
  
  	tx_pool->free_map[tx_pool->consumer_index] = IBMVNIC_INVALID_MAP;
  
  	offset = index * tx_pool->buf_size;
  	dst = tx_pool->long_term_buff.buff + offset;
  	memset(dst, 0, tx_pool->buf_size);
  	data_dma_addr = tx_pool->long_term_buff.addr + offset;
  
  	if (skb_shinfo(skb)->nr_frags) {
  		int cur, i;
  
  		/* Copy the head */
  		skb_copy_from_linear_data(skb, dst, skb_headlen(skb));
  		cur = skb_headlen(skb);
  
  		/* Copy the frags */
  		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
  			const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
  
  			memcpy(dst + cur, skb_frag_address(frag),
  			       skb_frag_size(frag));
  			cur += skb_frag_size(frag);
  		}
  	} else {
  		skb_copy_from_linear_data(skb, dst, skb->len);
  	}
  
  	/* post changes to long_term_buff *dst before VIOS accessing it */
  	dma_wmb();
  
  	tx_pool->consumer_index =
  	    (tx_pool->consumer_index + 1) % tx_pool->num_buffers;
  
  	tx_buff = &tx_pool->tx_buff[index];
  	tx_buff->skb = skb;
  	tx_buff->index = index;
  	tx_buff->pool_index = queue_num;
  
  	memset(&tx_crq, 0, sizeof(tx_crq));
  	tx_crq.v1.first = IBMVNIC_CRQ_CMD;
  	tx_crq.v1.type = IBMVNIC_TX_DESC;
  	tx_crq.v1.n_crq_elem = 1;
  	tx_crq.v1.n_sge = 1;
  	tx_crq.v1.flags1 = IBMVNIC_TX_COMP_NEEDED;
  
  	if (skb_is_gso(skb))
  		tx_crq.v1.correlator =
  			cpu_to_be32(index | IBMVNIC_TSO_POOL_MASK);
  	else
  		tx_crq.v1.correlator = cpu_to_be32(index);
  	tx_crq.v1.dma_reg = cpu_to_be16(tx_pool->long_term_buff.map_id);
  	tx_crq.v1.sge_len = cpu_to_be32(skb->len);
  	tx_crq.v1.ioba = cpu_to_be64(data_dma_addr);
  
  	if (adapter->vlan_header_insertion && skb_vlan_tag_present(skb)) {
  		tx_crq.v1.flags2 |= IBMVNIC_TX_VLAN_INSERT;
  		tx_crq.v1.vlan_id = cpu_to_be16(skb->vlan_tci);
  	}
  
  	if (skb->protocol == htons(ETH_P_IP)) {
  		tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV4;
  		proto = ip_hdr(skb)->protocol;
  	} else if (skb->protocol == htons(ETH_P_IPV6)) {
  		tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV6;
  		proto = ipv6_hdr(skb)->nexthdr;
  	}
  
  	if (proto == IPPROTO_TCP)
  		tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_TCP;
  	else if (proto == IPPROTO_UDP)
  		tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_UDP;
  
  	if (skb->ip_summed == CHECKSUM_PARTIAL) {
  		tx_crq.v1.flags1 |= IBMVNIC_TX_CHKSUM_OFFLOAD;
  		hdrs += 2;
  	}
  	if (skb_is_gso(skb)) {
  		tx_crq.v1.flags1 |= IBMVNIC_TX_LSO;
  		tx_crq.v1.mss = cpu_to_be16(skb_shinfo(skb)->gso_size);
  		hdrs += 2;
  	}
  
  	if ((*hdrs >> 7) & 1)
  		build_hdr_descs_arr(skb, indir_arr, &num_entries, *hdrs);
  
  	tx_crq.v1.n_crq_elem = num_entries;
  	tx_buff->num_entries = num_entries;
  	/* flush buffer if current entry can not fit */
  	if (num_entries + ind_bufp->index > IBMVNIC_MAX_IND_DESCS) {
  		lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq);
  		if (lpar_rc != H_SUCCESS)
  			goto tx_flush_err;
  	}
  
  	indir_arr[0] = tx_crq;
  	memcpy(&ind_bufp->indir_arr[ind_bufp->index], &indir_arr[0],
  	       num_entries * sizeof(struct ibmvnic_generic_scrq));
  	ind_bufp->index += num_entries;
  	if (__netdev_tx_sent_queue(txq, skb->len,
  				   netdev_xmit_more() &&
  				   ind_bufp->index < IBMVNIC_MAX_IND_DESCS)) {
  		lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq);
  		if (lpar_rc != H_SUCCESS)
  			goto tx_err;
  	}
  
  	if (atomic_add_return(num_entries, &tx_scrq->used)
  					>= adapter->req_tx_entries_per_subcrq) {
  		netdev_dbg(netdev, "Stopping queue %d\n", queue_num);
  		netif_stop_subqueue(netdev, queue_num);
  	}
  
  	tx_packets++;
  	tx_bytes += skb->len;
  	txq->trans_start = jiffies;
  	ret = NETDEV_TX_OK;
  	goto out;
  
  tx_flush_err:
  	dev_kfree_skb_any(skb);
  	tx_buff->skb = NULL;
  	tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
  				  tx_pool->num_buffers - 1 :
  				  tx_pool->consumer_index - 1;
  	tx_dropped++;
  tx_err:
  	if (lpar_rc != H_CLOSED && lpar_rc != H_PARAMETER)
  		dev_err_ratelimited(dev, "tx: send failed\n");
  
  	if (lpar_rc == H_CLOSED || adapter->failover_pending) {
  		/* Disable TX and report carrier off if queue is closed
  		 * or pending failover.
  		 * Firmware guarantees that a signal will be sent to the
  		 * driver, triggering a reset or some other action.
  		 */
  		netif_tx_stop_all_queues(netdev);
  		netif_carrier_off(netdev);
  	}
  out:
  	netdev->stats.tx_dropped += tx_dropped;
  	netdev->stats.tx_bytes += tx_bytes;
  	netdev->stats.tx_packets += tx_packets;
  	adapter->tx_send_failed += tx_send_failed;
  	adapter->tx_map_failed += tx_map_failed;
  	adapter->tx_stats_buffers[queue_num].packets += tx_packets;
  	adapter->tx_stats_buffers[queue_num].bytes += tx_bytes;
  	adapter->tx_stats_buffers[queue_num].dropped_packets += tx_dropped;
  
  	return ret;
  }
  
  static void ibmvnic_set_multi(struct net_device *netdev)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	struct netdev_hw_addr *ha;
  	union ibmvnic_crq crq;
  
  	memset(&crq, 0, sizeof(crq));
  	crq.request_capability.first = IBMVNIC_CRQ_CMD;
  	crq.request_capability.cmd = REQUEST_CAPABILITY;
  
  	if (netdev->flags & IFF_PROMISC) {
  		if (!adapter->promisc_supported)
  			return;
  	} else {
  		if (netdev->flags & IFF_ALLMULTI) {
  			/* Accept all multicast */
  			memset(&crq, 0, sizeof(crq));
  			crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
  			crq.multicast_ctrl.cmd = MULTICAST_CTRL;
  			crq.multicast_ctrl.flags = IBMVNIC_ENABLE_ALL;
  			ibmvnic_send_crq(adapter, &crq);
  		} else if (netdev_mc_empty(netdev)) {
  			/* Reject all multicast */
  			memset(&crq, 0, sizeof(crq));
  			crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
  			crq.multicast_ctrl.cmd = MULTICAST_CTRL;
  			crq.multicast_ctrl.flags = IBMVNIC_DISABLE_ALL;
  			ibmvnic_send_crq(adapter, &crq);
  		} else {
  			/* Accept one or more multicast(s) */
  			netdev_for_each_mc_addr(ha, netdev) {
  				memset(&crq, 0, sizeof(crq));
  				crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
  				crq.multicast_ctrl.cmd = MULTICAST_CTRL;
  				crq.multicast_ctrl.flags = IBMVNIC_ENABLE_MC;
  				ether_addr_copy(&crq.multicast_ctrl.mac_addr[0],
  						ha->addr);
  				ibmvnic_send_crq(adapter, &crq);
  			}
  		}
  	}
  }
  
  static int __ibmvnic_set_mac(struct net_device *netdev, u8 *dev_addr)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	union ibmvnic_crq crq;
  	int rc;
  
  	if (!is_valid_ether_addr(dev_addr)) {
  		rc = -EADDRNOTAVAIL;
  		goto err;
  	}
  
  	memset(&crq, 0, sizeof(crq));
  	crq.change_mac_addr.first = IBMVNIC_CRQ_CMD;
  	crq.change_mac_addr.cmd = CHANGE_MAC_ADDR;
  	ether_addr_copy(&crq.change_mac_addr.mac_addr[0], dev_addr);
  
  	mutex_lock(&adapter->fw_lock);
  	adapter->fw_done_rc = 0;
  	reinit_completion(&adapter->fw_done);
  
  	rc = ibmvnic_send_crq(adapter, &crq);
  	if (rc) {
  		rc = -EIO;
  		mutex_unlock(&adapter->fw_lock);
  		goto err;
  	}
  
  	rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
  	/* netdev->dev_addr is changed in handle_change_mac_rsp function */
  	if (rc || adapter->fw_done_rc) {
  		rc = -EIO;
  		mutex_unlock(&adapter->fw_lock);
  		goto err;
  	}
  	mutex_unlock(&adapter->fw_lock);
  	return 0;
  err:
  	ether_addr_copy(adapter->mac_addr, netdev->dev_addr);
  	return rc;
  }
  
  static int ibmvnic_set_mac(struct net_device *netdev, void *p)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	struct sockaddr *addr = p;
  	int rc;
  
  	rc = 0;
  	if (!is_valid_ether_addr(addr->sa_data))
  		return -EADDRNOTAVAIL;
  
  	ether_addr_copy(adapter->mac_addr, addr->sa_data);
  	if (adapter->state != VNIC_PROBED)
  		rc = __ibmvnic_set_mac(netdev, addr->sa_data);
  
  	return rc;
  }
  
  static const char *reset_reason_to_string(enum ibmvnic_reset_reason reason)
  {
  	switch (reason) {
  	case VNIC_RESET_FAILOVER:
  		return "FAILOVER";
  	case VNIC_RESET_MOBILITY:
  		return "MOBILITY";
  	case VNIC_RESET_FATAL:
  		return "FATAL";
  	case VNIC_RESET_NON_FATAL:
  		return "NON_FATAL";
  	case VNIC_RESET_TIMEOUT:
  		return "TIMEOUT";
  	case VNIC_RESET_CHANGE_PARAM:
  		return "CHANGE_PARAM";
  	case VNIC_RESET_PASSIVE_INIT:
  		return "PASSIVE_INIT";
  	}
  	return "UNKNOWN";
  }
  
  /*
   * do_reset returns zero if we are able to keep processing reset events, or
   * non-zero if we hit a fatal error and must halt.
   */
  static int do_reset(struct ibmvnic_adapter *adapter,
  		    struct ibmvnic_rwi *rwi, u32 reset_state)
  {
  	u64 old_num_rx_queues, old_num_tx_queues;
  	u64 old_num_rx_slots, old_num_tx_slots;
  	struct net_device *netdev = adapter->netdev;
  	int rc;
  
  	netdev_dbg(adapter->netdev,
  		   "[S:%s FOP:%d] Reset reason: %s, reset_state: %s\n",
  		   adapter_state_to_string(adapter->state),
  		   adapter->failover_pending,
  		   reset_reason_to_string(rwi->reset_reason),
  		   adapter_state_to_string(reset_state));
  
  	adapter->reset_reason = rwi->reset_reason;
  	/* requestor of VNIC_RESET_CHANGE_PARAM already has the rtnl lock */
  	if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
  		rtnl_lock();
  
  	/* Now that we have the rtnl lock, clear any pending failover.
  	 * This will ensure ibmvnic_open() has either completed or will
  	 * block until failover is complete.
  	 */
  	if (rwi->reset_reason == VNIC_RESET_FAILOVER)
  		adapter->failover_pending = false;
  
  	/* read the state and check (again) after getting rtnl */
  	reset_state = adapter->state;
  
  	if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
  		rc = -EBUSY;
  		goto out;
  	}
  
  	netif_carrier_off(netdev);
  
  	old_num_rx_queues = adapter->req_rx_queues;
  	old_num_tx_queues = adapter->req_tx_queues;
  	old_num_rx_slots = adapter->req_rx_add_entries_per_subcrq;
  	old_num_tx_slots = adapter->req_tx_entries_per_subcrq;
  
  	ibmvnic_cleanup(netdev);
  
  	if (reset_state == VNIC_OPEN &&
  	    adapter->reset_reason != VNIC_RESET_MOBILITY &&
  	    adapter->reset_reason != VNIC_RESET_FAILOVER) {
  		if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
  			rc = __ibmvnic_close(netdev);
  			if (rc)
  				goto out;
  		} else {
  			adapter->state = VNIC_CLOSING;
  
  			/* Release the RTNL lock before link state change and
  			 * re-acquire after the link state change to allow
  			 * linkwatch_event to grab the RTNL lock and run during
  			 * a reset.
  			 */
  			rtnl_unlock();
  			rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
  			rtnl_lock();
  			if (rc)
  				goto out;
  
  			if (adapter->state == VNIC_OPEN) {
  				/* When we dropped rtnl, ibmvnic_open() got
  				 * it and noticed that we are resetting and
  				 * set the adapter state to OPEN. Update our
  				 * new "target" state, and resume the reset
  				 * from VNIC_CLOSING state.
  				 */
  				netdev_dbg(netdev,
  					   "Open changed state from %s, updating.\n",
  					   adapter_state_to_string(reset_state));
  				reset_state = VNIC_OPEN;
  				adapter->state = VNIC_CLOSING;
  			}
  
  			if (adapter->state != VNIC_CLOSING) {
  				/* If someone else changed the adapter state
  				 * when we dropped the rtnl, fail the reset
  				 */
  				rc = -1;
  				goto out;
  			}
  			adapter->state = VNIC_CLOSED;
  		}
  	}
  
  	if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
  		release_resources(adapter);
  		release_sub_crqs(adapter, 1);
  		release_crq_queue(adapter);
  	}
  
  	if (adapter->reset_reason != VNIC_RESET_NON_FATAL) {
  		/* remove the closed state so when we call open it appears
  		 * we are coming from the probed state.
  		 */
  		adapter->state = VNIC_PROBED;
  
  		if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
  			rc = init_crq_queue(adapter);
  		} else if (adapter->reset_reason == VNIC_RESET_MOBILITY) {
  			rc = ibmvnic_reenable_crq_queue(adapter);
  			release_sub_crqs(adapter, 1);
  		} else {
  			rc = ibmvnic_reset_crq(adapter);
  			if (rc == H_CLOSED || rc == H_SUCCESS) {
  				rc = vio_enable_interrupts(adapter->vdev);
  				if (rc)
  					netdev_err(adapter->netdev,
  						   "Reset failed to enable interrupts. rc=%d\n",
  						   rc);
  			}
  		}
  
  		if (rc) {
  			netdev_err(adapter->netdev,
  				   "Reset couldn't initialize crq. rc=%d\n", rc);
  			goto out;
  		}
  
  		rc = ibmvnic_reset_init(adapter, true);
  		if (rc) {
  			rc = IBMVNIC_INIT_FAILED;
  			goto out;
  		}
  
  		/* If the adapter was in PROBE or DOWN state prior to the reset,
  		 * exit here.
  		 */
  		if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN) {
  			rc = 0;
  			goto out;
  		}
  
  		rc = ibmvnic_login(netdev);
  		if (rc)
  			goto out;
  
  		if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
  			rc = init_resources(adapter);
  			if (rc)
  				goto out;
  		} else if (adapter->req_rx_queues != old_num_rx_queues ||
  		    adapter->req_tx_queues != old_num_tx_queues ||
  		    adapter->req_rx_add_entries_per_subcrq !=
  		    old_num_rx_slots ||
  		    adapter->req_tx_entries_per_subcrq !=
  		    old_num_tx_slots ||
  		    !adapter->rx_pool ||
  		    !adapter->tso_pool ||
  		    !adapter->tx_pool) {
  			release_rx_pools(adapter);
  			release_tx_pools(adapter);
  			release_napi(adapter);
  			release_vpd_data(adapter);
  
  			rc = init_resources(adapter);
  			if (rc)
  				goto out;
  
  		} else {
  			rc = reset_tx_pools(adapter);
  			if (rc) {
  				netdev_dbg(adapter->netdev, "reset tx pools failed (%d)\n",
  					   rc);
  				goto out;
  			}
  
  			rc = reset_rx_pools(adapter);
  			if (rc) {
  				netdev_dbg(adapter->netdev, "reset rx pools failed (%d)\n",
  					   rc);
  				goto out;
  			}
  		}
  		ibmvnic_disable_irqs(adapter);
  	}
  	adapter->state = VNIC_CLOSED;
  
  	if (reset_state == VNIC_CLOSED) {
  		rc = 0;
  		goto out;
  	}
  
  	rc = __ibmvnic_open(netdev);
  	if (rc) {
  		rc = IBMVNIC_OPEN_FAILED;
  		goto out;
  	}
  
  	/* refresh device's multicast list */
  	ibmvnic_set_multi(netdev);
  
  	if (adapter->reset_reason == VNIC_RESET_FAILOVER ||
  	    adapter->reset_reason == VNIC_RESET_MOBILITY)
  		__netdev_notify_peers(netdev);
  
  	rc = 0;
  
  out:
  	/* restore the adapter state if reset failed */
  	if (rc)
  		adapter->state = reset_state;
  	/* requestor of VNIC_RESET_CHANGE_PARAM should still hold the rtnl lock */
  	if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
  		rtnl_unlock();
  
  	netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Reset done, rc %d\n",
  		   adapter_state_to_string(adapter->state),
  		   adapter->failover_pending, rc);
  	return rc;
  }
  
  static int do_hard_reset(struct ibmvnic_adapter *adapter,
  			 struct ibmvnic_rwi *rwi, u32 reset_state)
  {
  	struct net_device *netdev = adapter->netdev;
  	int rc;
  
  	netdev_dbg(adapter->netdev, "Hard resetting driver (%s)\n",
  		   reset_reason_to_string(rwi->reset_reason));
  
  	/* read the state and check (again) after getting rtnl */
  	reset_state = adapter->state;
  
  	if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
  		rc = -EBUSY;
  		goto out;
  	}
  
  	netif_carrier_off(netdev);
  	adapter->reset_reason = rwi->reset_reason;
  
  	ibmvnic_cleanup(netdev);
  	release_resources(adapter);
  	release_sub_crqs(adapter, 0);
  	release_crq_queue(adapter);
  
  	/* remove the closed state so when we call open it appears
  	 * we are coming from the probed state.
  	 */
  	adapter->state = VNIC_PROBED;
  
  	reinit_completion(&adapter->init_done);
  	rc = init_crq_queue(adapter);
  	if (rc) {
  		netdev_err(adapter->netdev,
  			   "Couldn't initialize crq. rc=%d\n", rc);
  		goto out;
  	}
  
  	rc = ibmvnic_reset_init(adapter, false);
  	if (rc)
  		goto out;
  
  	/* If the adapter was in PROBE or DOWN state prior to the reset,
  	 * exit here.
  	 */
  	if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN)
  		goto out;
  
  	rc = ibmvnic_login(netdev);
  	if (rc)
  		goto out;
  
  	rc = init_resources(adapter);
  	if (rc)
  		goto out;
  
  	ibmvnic_disable_irqs(adapter);
  	adapter->state = VNIC_CLOSED;
  
  	if (reset_state == VNIC_CLOSED)
  		goto out;
  
  	rc = __ibmvnic_open(netdev);
  	if (rc) {
  		rc = IBMVNIC_OPEN_FAILED;
  		goto out;
  	}
  
  	__netdev_notify_peers(netdev);
  out:
  	/* restore adapter state if reset failed */
  	if (rc)
  		adapter->state = reset_state;
  	netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Hard reset done, rc %d\n",
  		   adapter_state_to_string(adapter->state),
  		   adapter->failover_pending, rc);
  	return rc;
  }
  
  static struct ibmvnic_rwi *get_next_rwi(struct ibmvnic_adapter *adapter)
  {
  	struct ibmvnic_rwi *rwi;
  	unsigned long flags;
  
  	spin_lock_irqsave(&adapter->rwi_lock, flags);
  
  	if (!list_empty(&adapter->rwi_list)) {
  		rwi = list_first_entry(&adapter->rwi_list, struct ibmvnic_rwi,
  				       list);
  		list_del(&rwi->list);
  	} else {
  		rwi = NULL;
  	}
  
  	spin_unlock_irqrestore(&adapter->rwi_lock, flags);
  	return rwi;
  }
  
  /**
   * do_passive_init - complete probing when partner device is detected.
   * @adapter: ibmvnic_adapter struct
   *
   * If the ibmvnic device does not have a partner device to communicate with at boot
   * and that partner device comes online at a later time, this function is called
   * to complete the initialization process of ibmvnic device.
   * Caller is expected to hold rtnl_lock().
   *
   * Returns non-zero if sub-CRQs are not initialized properly leaving the device
   * in the down state.
   * Returns 0 upon success and the device is in PROBED state.
   */
  
  static int do_passive_init(struct ibmvnic_adapter *adapter)
  {
  	unsigned long timeout = msecs_to_jiffies(30000);
  	struct net_device *netdev = adapter->netdev;
  	struct device *dev = &adapter->vdev->dev;
  	int rc;
  
  	netdev_dbg(netdev, "Partner device found, probing.\n");
  
  	adapter->state = VNIC_PROBING;
  	reinit_completion(&adapter->init_done);
  	adapter->init_done_rc = 0;
  	adapter->crq.active = true;
  
  	rc = send_crq_init_complete(adapter);
  	if (rc)
  		goto out;
  
  	rc = send_version_xchg(adapter);
  	if (rc)
  		netdev_dbg(adapter->netdev, "send_version_xchg failed, rc=%d\n", rc);
  
  	if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
  		dev_err(dev, "Initialization sequence timed out\n");
  		rc = -ETIMEDOUT;
  		goto out;
  	}
  
  	rc = init_sub_crqs(adapter);
  	if (rc) {
  		dev_err(dev, "Initialization of sub crqs failed, rc=%d\n", rc);
  		goto out;
  	}
  
  	rc = init_sub_crq_irqs(adapter);
  	if (rc) {
  		dev_err(dev, "Failed to initialize sub crq irqs\n, rc=%d", rc);
  		goto init_failed;
  	}
  
  	netdev->mtu = adapter->req_mtu - ETH_HLEN;
  	netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
  	netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
  
  	adapter->state = VNIC_PROBED;
  	netdev_dbg(netdev, "Probed successfully. Waiting for signal from partner device.\n");
  
  	return 0;
  
  init_failed:
  	release_sub_crqs(adapter, 1);
  out:
  	adapter->state = VNIC_DOWN;
  	return rc;
  }
  
  static void __ibmvnic_reset(struct work_struct *work)
  {
  	struct ibmvnic_adapter *adapter;
  	bool saved_state = false;
  	struct ibmvnic_rwi *tmprwi;
  	struct ibmvnic_rwi *rwi;
  	unsigned long flags;
  	u32 reset_state;
  	int rc = 0;
  
  	adapter = container_of(work, struct ibmvnic_adapter, ibmvnic_reset);
  
  	if (test_and_set_bit_lock(0, &adapter->resetting)) {
  		queue_delayed_work(system_long_wq,
  				   &adapter->ibmvnic_delayed_reset,
  				   IBMVNIC_RESET_DELAY);
  		return;
  	}
  
  	rwi = get_next_rwi(adapter);
  	while (rwi) {
  		spin_lock_irqsave(&adapter->state_lock, flags);
  
  		if (adapter->state == VNIC_REMOVING ||
  		    adapter->state == VNIC_REMOVED) {
  			spin_unlock_irqrestore(&adapter->state_lock, flags);
  			kfree(rwi);
  			rc = EBUSY;
  			break;
  		}
  
  		if (!saved_state) {
  			reset_state = adapter->state;
  			saved_state = true;
  		}
  		spin_unlock_irqrestore(&adapter->state_lock, flags);
  
  		if (rwi->reset_reason == VNIC_RESET_PASSIVE_INIT) {
  			rtnl_lock();
  			rc = do_passive_init(adapter);
  			rtnl_unlock();
  			if (!rc)
  				netif_carrier_on(adapter->netdev);
  		} else if (adapter->force_reset_recovery) {
  			/* Since we are doing a hard reset now, clear the
  			 * failover_pending flag so we don't ignore any
  			 * future MOBILITY or other resets.
  			 */
  			adapter->failover_pending = false;
  
  			/* Transport event occurred during previous reset */
  			if (adapter->wait_for_reset) {
  				/* Previous was CHANGE_PARAM; caller locked */
  				adapter->force_reset_recovery = false;
  				rc = do_hard_reset(adapter, rwi, reset_state);
  			} else {
  				rtnl_lock();
  				adapter->force_reset_recovery = false;
  				rc = do_hard_reset(adapter, rwi, reset_state);
  				rtnl_unlock();
  			}
  			if (rc) {
  				/* give backing device time to settle down */
  				netdev_dbg(adapter->netdev,
  					   "[S:%s] Hard reset failed, waiting 60 secs\n",
  					   adapter_state_to_string(adapter->state));
  				set_current_state(TASK_UNINTERRUPTIBLE);
  				schedule_timeout(60 * HZ);
  			}
  		} else {
  			rc = do_reset(adapter, rwi, reset_state);
  		}
  		tmprwi = rwi;
  		adapter->last_reset_time = jiffies;
  
  		if (rc)
  			netdev_dbg(adapter->netdev, "Reset failed, rc=%d\n", rc);
  
  		rwi = get_next_rwi(adapter);
  
  		/*
  		 * If there is another reset queued, free the previous rwi
  		 * and process the new reset even if previous reset failed
  		 * (the previous reset could have failed because of a fail
  		 * over for instance, so process the fail over).
  		 *
  		 * If there are no resets queued and the previous reset failed,
  		 * the adapter would be in an undefined state. So retry the
  		 * previous reset as a hard reset.
  		 */
  		if (rwi)
  			kfree(tmprwi);
  		else if (rc)
  			rwi = tmprwi;
  
  		if (rwi && (rwi->reset_reason == VNIC_RESET_FAILOVER ||
  			    rwi->reset_reason == VNIC_RESET_MOBILITY || rc))
  			adapter->force_reset_recovery = true;
  	}
  
  	if (adapter->wait_for_reset) {
  		adapter->reset_done_rc = rc;
  		complete(&adapter->reset_done);
  	}
  
  	clear_bit_unlock(0, &adapter->resetting);
  
  	netdev_dbg(adapter->netdev,
  		   "[S:%s FRR:%d WFR:%d] Done processing resets\n",
  		   adapter_state_to_string(adapter->state),
  		   adapter->force_reset_recovery,
  		   adapter->wait_for_reset);
  }
  
  static void __ibmvnic_delayed_reset(struct work_struct *work)
  {
  	struct ibmvnic_adapter *adapter;
  
  	adapter = container_of(work, struct ibmvnic_adapter,
  			       ibmvnic_delayed_reset.work);
  	__ibmvnic_reset(&adapter->ibmvnic_reset);
  }
  
  static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
  			 enum ibmvnic_reset_reason reason)
  {
  	struct list_head *entry, *tmp_entry;
  	struct ibmvnic_rwi *rwi, *tmp;
  	struct net_device *netdev = adapter->netdev;
  	unsigned long flags;
  	int ret;
  
  	spin_lock_irqsave(&adapter->rwi_lock, flags);
  
  	/* If failover is pending don't schedule any other reset.
  	 * Instead let the failover complete. If there is already a
  	 * a failover reset scheduled, we will detect and drop the
  	 * duplicate reset when walking the ->rwi_list below.
  	 */
  	if (adapter->state == VNIC_REMOVING ||
  	    adapter->state == VNIC_REMOVED ||
  	    (adapter->failover_pending && reason != VNIC_RESET_FAILOVER)) {
  		ret = EBUSY;
  		netdev_dbg(netdev, "Adapter removing or pending failover, skipping reset\n");
  		goto err;
  	}
  
  	if (adapter->state == VNIC_PROBING) {
  		netdev_warn(netdev, "Adapter reset during probe\n");
  		adapter->init_done_rc = -EAGAIN;
  		ret = EAGAIN;
  		goto err;
  	}
  
  	list_for_each_entry(tmp, &adapter->rwi_list, list) {
  		if (tmp->reset_reason == reason) {
  			netdev_dbg(netdev, "Skipping matching reset, reason=%s\n",
  				   reset_reason_to_string(reason));
  			ret = EBUSY;
  			goto err;
  		}
  	}
  
  	rwi = kzalloc(sizeof(*rwi), GFP_ATOMIC);
  	if (!rwi) {
  		ret = ENOMEM;
  		goto err;
  	}
  	/* if we just received a transport event,
  	 * flush reset queue and process this reset
  	 */
  	if (adapter->force_reset_recovery && !list_empty(&adapter->rwi_list)) {
  		list_for_each_safe(entry, tmp_entry, &adapter->rwi_list)
  			list_del(entry);
  	}
  	rwi->reset_reason = reason;
  	list_add_tail(&rwi->list, &adapter->rwi_list);
  	netdev_dbg(adapter->netdev, "Scheduling reset (reason %s)\n",
  		   reset_reason_to_string(reason));
  	queue_work(system_long_wq, &adapter->ibmvnic_reset);
  
  	ret = 0;
  err:
  	/* ibmvnic_close() below can block, so drop the lock first */
  	spin_unlock_irqrestore(&adapter->rwi_lock, flags);
  
  	if (ret == ENOMEM)
  		ibmvnic_close(netdev);
  
  	return -ret;
  }
  
  static void ibmvnic_tx_timeout(struct net_device *dev, unsigned int txqueue)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(dev);
  
  	if (test_bit(0, &adapter->resetting)) {
  		netdev_err(adapter->netdev,
  			   "Adapter is resetting, skip timeout reset\n");
  		return;
  	}
  	/* No queuing up reset until at least 5 seconds (default watchdog val)
  	 * after last reset
  	 */
  	if (time_before(jiffies, (adapter->last_reset_time + dev->watchdog_timeo))) {
  		netdev_dbg(dev, "Not yet time to tx timeout.\n");
  		return;
  	}
  	ibmvnic_reset(adapter, VNIC_RESET_TIMEOUT);
  }
  
  static void remove_buff_from_pool(struct ibmvnic_adapter *adapter,
  				  struct ibmvnic_rx_buff *rx_buff)
  {
  	struct ibmvnic_rx_pool *pool = &adapter->rx_pool[rx_buff->pool_index];
  
  	rx_buff->skb = NULL;
  
  	pool->free_map[pool->next_alloc] = (int)(rx_buff - pool->rx_buff);
  	pool->next_alloc = (pool->next_alloc + 1) % pool->size;
  
  	atomic_dec(&pool->available);
  }
  
  static int ibmvnic_poll(struct napi_struct *napi, int budget)
  {
  	struct ibmvnic_sub_crq_queue *rx_scrq;
  	struct ibmvnic_adapter *adapter;
  	struct net_device *netdev;
  	int frames_processed;
  	int scrq_num;
  
  	netdev = napi->dev;
  	adapter = netdev_priv(netdev);
  	scrq_num = (int)(napi - adapter->napi);
  	frames_processed = 0;
  	rx_scrq = adapter->rx_scrq[scrq_num];
  
  restart_poll:
  	while (frames_processed < budget) {
  		struct sk_buff *skb;
  		struct ibmvnic_rx_buff *rx_buff;
  		union sub_crq *next;
  		u32 length;
  		u16 offset;
  		u8 flags = 0;
  
  		if (unlikely(test_bit(0, &adapter->resetting) &&
  			     adapter->reset_reason != VNIC_RESET_NON_FATAL)) {
  			enable_scrq_irq(adapter, rx_scrq);
  			napi_complete_done(napi, frames_processed);
  			return frames_processed;
  		}
  
  		if (!pending_scrq(adapter, rx_scrq))
  			break;
  		next = ibmvnic_next_scrq(adapter, rx_scrq);
  		rx_buff = (struct ibmvnic_rx_buff *)
  			  be64_to_cpu(next->rx_comp.correlator);
  		/* do error checking */
  		if (next->rx_comp.rc) {
  			netdev_dbg(netdev, "rx buffer returned with rc %x\n",
  				   be16_to_cpu(next->rx_comp.rc));
  			/* free the entry */
  			next->rx_comp.first = 0;
  			dev_kfree_skb_any(rx_buff->skb);
  			remove_buff_from_pool(adapter, rx_buff);
  			continue;
  		} else if (!rx_buff->skb) {
  			/* free the entry */
  			next->rx_comp.first = 0;
  			remove_buff_from_pool(adapter, rx_buff);
  			continue;
  		}
  
  		length = be32_to_cpu(next->rx_comp.len);
  		offset = be16_to_cpu(next->rx_comp.off_frame_data);
  		flags = next->rx_comp.flags;
  		skb = rx_buff->skb;
  		/* load long_term_buff before copying to skb */
  		dma_rmb();
  		skb_copy_to_linear_data(skb, rx_buff->data + offset,
  					length);
  
  		/* VLAN Header has been stripped by the system firmware and
  		 * needs to be inserted by the driver
  		 */
  		if (adapter->rx_vlan_header_insertion &&
  		    (flags & IBMVNIC_VLAN_STRIPPED))
  			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
  					       ntohs(next->rx_comp.vlan_tci));
  
  		/* free the entry */
  		next->rx_comp.first = 0;
  		remove_buff_from_pool(adapter, rx_buff);
  
  		skb_put(skb, length);
  		skb->protocol = eth_type_trans(skb, netdev);
  		skb_record_rx_queue(skb, scrq_num);
  
  		if (flags & IBMVNIC_IP_CHKSUM_GOOD &&
  		    flags & IBMVNIC_TCP_UDP_CHKSUM_GOOD) {
  			skb->ip_summed = CHECKSUM_UNNECESSARY;
  		}
  
  		length = skb->len;
  		napi_gro_receive(napi, skb); /* send it up */
  		netdev->stats.rx_packets++;
  		netdev->stats.rx_bytes += length;
  		adapter->rx_stats_buffers[scrq_num].packets++;
  		adapter->rx_stats_buffers[scrq_num].bytes += length;
  		frames_processed++;
  	}
  
  	if (adapter->state != VNIC_CLOSING &&
  	    ((atomic_read(&adapter->rx_pool[scrq_num].available) <
  	      adapter->req_rx_add_entries_per_subcrq / 2) ||
  	      frames_processed < budget))
  		replenish_rx_pool(adapter, &adapter->rx_pool[scrq_num]);
  	if (frames_processed < budget) {
  		if (napi_complete_done(napi, frames_processed)) {
  			enable_scrq_irq(adapter, rx_scrq);
  			if (pending_scrq(adapter, rx_scrq)) {
  				if (napi_reschedule(napi)) {
  					disable_scrq_irq(adapter, rx_scrq);
  					goto restart_poll;
  				}
  			}
  		}
  	}
  	return frames_processed;
  }
  
  static int wait_for_reset(struct ibmvnic_adapter *adapter)
  {
  	int rc, ret;
  
  	adapter->fallback.mtu = adapter->req_mtu;
  	adapter->fallback.rx_queues = adapter->req_rx_queues;
  	adapter->fallback.tx_queues = adapter->req_tx_queues;
  	adapter->fallback.rx_entries = adapter->req_rx_add_entries_per_subcrq;
  	adapter->fallback.tx_entries = adapter->req_tx_entries_per_subcrq;
  
  	reinit_completion(&adapter->reset_done);
  	adapter->wait_for_reset = true;
  	rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
  
  	if (rc) {
  		ret = rc;
  		goto out;
  	}
  	rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done, 60000);
  	if (rc) {
  		ret = -ENODEV;
  		goto out;
  	}
  
  	ret = 0;
  	if (adapter->reset_done_rc) {
  		ret = -EIO;
  		adapter->desired.mtu = adapter->fallback.mtu;
  		adapter->desired.rx_queues = adapter->fallback.rx_queues;
  		adapter->desired.tx_queues = adapter->fallback.tx_queues;
  		adapter->desired.rx_entries = adapter->fallback.rx_entries;
  		adapter->desired.tx_entries = adapter->fallback.tx_entries;
  
  		reinit_completion(&adapter->reset_done);
  		adapter->wait_for_reset = true;
  		rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
  		if (rc) {
  			ret = rc;
  			goto out;
  		}
  		rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done,
  						 60000);
  		if (rc) {
  			ret = -ENODEV;
  			goto out;
  		}
  	}
  out:
  	adapter->wait_for_reset = false;
  
  	return ret;
  }
  
  static int ibmvnic_change_mtu(struct net_device *netdev, int new_mtu)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  
  	adapter->desired.mtu = new_mtu + ETH_HLEN;
  
  	return wait_for_reset(adapter);
  }
  
  static netdev_features_t ibmvnic_features_check(struct sk_buff *skb,
  						struct net_device *dev,
  						netdev_features_t features)
  {
  	/* Some backing hardware adapters can not
  	 * handle packets with a MSS less than 224
  	 * or with only one segment.
  	 */
  	if (skb_is_gso(skb)) {
  		if (skb_shinfo(skb)->gso_size < 224 ||
  		    skb_shinfo(skb)->gso_segs == 1)
  			features &= ~NETIF_F_GSO_MASK;
  	}
  
  	return features;
  }
  
  static const struct net_device_ops ibmvnic_netdev_ops = {
  	.ndo_open		= ibmvnic_open,
  	.ndo_stop		= ibmvnic_close,
  	.ndo_start_xmit		= ibmvnic_xmit,
  	.ndo_set_rx_mode	= ibmvnic_set_multi,
  	.ndo_set_mac_address	= ibmvnic_set_mac,
  	.ndo_validate_addr	= eth_validate_addr,
  	.ndo_tx_timeout		= ibmvnic_tx_timeout,
  	.ndo_change_mtu		= ibmvnic_change_mtu,
  	.ndo_features_check     = ibmvnic_features_check,
  };
  
  /* ethtool functions */
  
  static int ibmvnic_get_link_ksettings(struct net_device *netdev,
  				      struct ethtool_link_ksettings *cmd)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	int rc;
  
  	rc = send_query_phys_parms(adapter);
  	if (rc) {
  		adapter->speed = SPEED_UNKNOWN;
  		adapter->duplex = DUPLEX_UNKNOWN;
  	}
  	cmd->base.speed = adapter->speed;
  	cmd->base.duplex = adapter->duplex;
  	cmd->base.port = PORT_FIBRE;
  	cmd->base.phy_address = 0;
  	cmd->base.autoneg = AUTONEG_ENABLE;
  
  	return 0;
  }
  
  static void ibmvnic_get_drvinfo(struct net_device *netdev,
  				struct ethtool_drvinfo *info)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  
  	strscpy(info->driver, ibmvnic_driver_name, sizeof(info->driver));
  	strscpy(info->version, IBMVNIC_DRIVER_VERSION, sizeof(info->version));
  	strscpy(info->fw_version, adapter->fw_version,
  		sizeof(info->fw_version));
  }
  
  static u32 ibmvnic_get_msglevel(struct net_device *netdev)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  
  	return adapter->msg_enable;
  }
  
  static void ibmvnic_set_msglevel(struct net_device *netdev, u32 data)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  
  	adapter->msg_enable = data;
  }
  
  static u32 ibmvnic_get_link(struct net_device *netdev)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  
  	/* Don't need to send a query because we request a logical link up at
  	 * init and then we wait for link state indications
  	 */
  	return adapter->logical_link_state;
  }
  
  static void ibmvnic_get_ringparam(struct net_device *netdev,
  				  struct ethtool_ringparam *ring)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  
  	if (adapter->priv_flags & IBMVNIC_USE_SERVER_MAXES) {
  		ring->rx_max_pending = adapter->max_rx_add_entries_per_subcrq;
  		ring->tx_max_pending = adapter->max_tx_entries_per_subcrq;
  	} else {
  		ring->rx_max_pending = IBMVNIC_MAX_QUEUE_SZ;
  		ring->tx_max_pending = IBMVNIC_MAX_QUEUE_SZ;
  	}
  	ring->rx_mini_max_pending = 0;
  	ring->rx_jumbo_max_pending = 0;
  	ring->rx_pending = adapter->req_rx_add_entries_per_subcrq;
  	ring->tx_pending = adapter->req_tx_entries_per_subcrq;
  	ring->rx_mini_pending = 0;
  	ring->rx_jumbo_pending = 0;
  }
  
  static int ibmvnic_set_ringparam(struct net_device *netdev,
  				 struct ethtool_ringparam *ring)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	int ret;
  
  	ret = 0;
  	adapter->desired.rx_entries = ring->rx_pending;
  	adapter->desired.tx_entries = ring->tx_pending;
  
  	ret = wait_for_reset(adapter);
  
  	if (!ret &&
  	    (adapter->req_rx_add_entries_per_subcrq != ring->rx_pending ||
  	     adapter->req_tx_entries_per_subcrq != ring->tx_pending))
  		netdev_info(netdev,
  			    "Could not match full ringsize request. Requested: RX %d, TX %d; Allowed: RX %llu, TX %llu\n",
  			    ring->rx_pending, ring->tx_pending,
  			    adapter->req_rx_add_entries_per_subcrq,
  			    adapter->req_tx_entries_per_subcrq);
  	return ret;
  }
  
  static void ibmvnic_get_channels(struct net_device *netdev,
  				 struct ethtool_channels *channels)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  
  	if (adapter->priv_flags & IBMVNIC_USE_SERVER_MAXES) {
  		channels->max_rx = adapter->max_rx_queues;
  		channels->max_tx = adapter->max_tx_queues;
  	} else {
  		channels->max_rx = IBMVNIC_MAX_QUEUES;
  		channels->max_tx = IBMVNIC_MAX_QUEUES;
  	}
  
  	channels->max_other = 0;
  	channels->max_combined = 0;
  	channels->rx_count = adapter->req_rx_queues;
  	channels->tx_count = adapter->req_tx_queues;
  	channels->other_count = 0;
  	channels->combined_count = 0;
  }
  
  static int ibmvnic_set_channels(struct net_device *netdev,
  				struct ethtool_channels *channels)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	int ret;
  
  	ret = 0;
  	adapter->desired.rx_queues = channels->rx_count;
  	adapter->desired.tx_queues = channels->tx_count;
  
  	ret = wait_for_reset(adapter);
  
  	if (!ret &&
  	    (adapter->req_rx_queues != channels->rx_count ||
  	     adapter->req_tx_queues != channels->tx_count))
  		netdev_info(netdev,
  			    "Could not match full channels request. Requested: RX %d, TX %d; Allowed: RX %llu, TX %llu\n",
  			    channels->rx_count, channels->tx_count,
  			    adapter->req_rx_queues, adapter->req_tx_queues);
  	return ret;
  }
  
  static void ibmvnic_get_strings(struct net_device *dev, u32 stringset, u8 *data)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(dev);
  	int i;
  
  	switch (stringset) {
  	case ETH_SS_STATS:
  		for (i = 0; i < ARRAY_SIZE(ibmvnic_stats);
  				i++, data += ETH_GSTRING_LEN)
  			memcpy(data, ibmvnic_stats[i].name, ETH_GSTRING_LEN);
  
  		for (i = 0; i < adapter->req_tx_queues; i++) {
  			snprintf(data, ETH_GSTRING_LEN, "tx%d_packets", i);
  			data += ETH_GSTRING_LEN;
  
  			snprintf(data, ETH_GSTRING_LEN, "tx%d_bytes", i);
  			data += ETH_GSTRING_LEN;
  
  			snprintf(data, ETH_GSTRING_LEN,
  				 "tx%d_dropped_packets", i);
  			data += ETH_GSTRING_LEN;
  		}
  
  		for (i = 0; i < adapter->req_rx_queues; i++) {
  			snprintf(data, ETH_GSTRING_LEN, "rx%d_packets", i);
  			data += ETH_GSTRING_LEN;
  
  			snprintf(data, ETH_GSTRING_LEN, "rx%d_bytes", i);
  			data += ETH_GSTRING_LEN;
  
  			snprintf(data, ETH_GSTRING_LEN, "rx%d_interrupts", i);
  			data += ETH_GSTRING_LEN;
  		}
  		break;
  
  	case ETH_SS_PRIV_FLAGS:
  		for (i = 0; i < ARRAY_SIZE(ibmvnic_priv_flags); i++)
  			strcpy(data + i * ETH_GSTRING_LEN,
  			       ibmvnic_priv_flags[i]);
  		break;
  	default:
  		return;
  	}
  }
  
  static int ibmvnic_get_sset_count(struct net_device *dev, int sset)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(dev);
  
  	switch (sset) {
  	case ETH_SS_STATS:
  		return ARRAY_SIZE(ibmvnic_stats) +
  		       adapter->req_tx_queues * NUM_TX_STATS +
  		       adapter->req_rx_queues * NUM_RX_STATS;
  	case ETH_SS_PRIV_FLAGS:
  		return ARRAY_SIZE(ibmvnic_priv_flags);
  	default:
  		return -EOPNOTSUPP;
  	}
  }
  
  static void ibmvnic_get_ethtool_stats(struct net_device *dev,
  				      struct ethtool_stats *stats, u64 *data)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(dev);
  	union ibmvnic_crq crq;
  	int i, j;
  	int rc;
  
  	memset(&crq, 0, sizeof(crq));
  	crq.request_statistics.first = IBMVNIC_CRQ_CMD;
  	crq.request_statistics.cmd = REQUEST_STATISTICS;
  	crq.request_statistics.ioba = cpu_to_be32(adapter->stats_token);
  	crq.request_statistics.len =
  	    cpu_to_be32(sizeof(struct ibmvnic_statistics));
  
  	/* Wait for data to be written */
  	reinit_completion(&adapter->stats_done);
  	rc = ibmvnic_send_crq(adapter, &crq);
  	if (rc)
  		return;
  	rc = ibmvnic_wait_for_completion(adapter, &adapter->stats_done, 10000);
  	if (rc)
  		return;
  
  	for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++)
  		data[i] = be64_to_cpu(IBMVNIC_GET_STAT
  				      (adapter, ibmvnic_stats[i].offset));
  
  	for (j = 0; j < adapter->req_tx_queues; j++) {
  		data[i] = adapter->tx_stats_buffers[j].packets;
  		i++;
  		data[i] = adapter->tx_stats_buffers[j].bytes;
  		i++;
  		data[i] = adapter->tx_stats_buffers[j].dropped_packets;
  		i++;
  	}
  
  	for (j = 0; j < adapter->req_rx_queues; j++) {
  		data[i] = adapter->rx_stats_buffers[j].packets;
  		i++;
  		data[i] = adapter->rx_stats_buffers[j].bytes;
  		i++;
  		data[i] = adapter->rx_stats_buffers[j].interrupts;
  		i++;
  	}
  }
  
  static u32 ibmvnic_get_priv_flags(struct net_device *netdev)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  
  	return adapter->priv_flags;
  }
  
  static int ibmvnic_set_priv_flags(struct net_device *netdev, u32 flags)
  {
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	bool which_maxes = !!(flags & IBMVNIC_USE_SERVER_MAXES);
  
  	if (which_maxes)
  		adapter->priv_flags |= IBMVNIC_USE_SERVER_MAXES;
  	else
  		adapter->priv_flags &= ~IBMVNIC_USE_SERVER_MAXES;
  
  	return 0;
  }
  
  static const struct ethtool_ops ibmvnic_ethtool_ops = {
  	.get_drvinfo		= ibmvnic_get_drvinfo,
  	.get_msglevel		= ibmvnic_get_msglevel,
  	.set_msglevel		= ibmvnic_set_msglevel,
  	.get_link		= ibmvnic_get_link,
  	.get_ringparam		= ibmvnic_get_ringparam,
  	.set_ringparam		= ibmvnic_set_ringparam,
  	.get_channels		= ibmvnic_get_channels,
  	.set_channels		= ibmvnic_set_channels,
  	.get_strings            = ibmvnic_get_strings,
  	.get_sset_count         = ibmvnic_get_sset_count,
  	.get_ethtool_stats	= ibmvnic_get_ethtool_stats,
  	.get_link_ksettings	= ibmvnic_get_link_ksettings,
  	.get_priv_flags		= ibmvnic_get_priv_flags,
  	.set_priv_flags		= ibmvnic_set_priv_flags,
  };
  
  /* Routines for managing CRQs/sCRQs  */
  
  static int reset_one_sub_crq_queue(struct ibmvnic_adapter *adapter,
  				   struct ibmvnic_sub_crq_queue *scrq)
  {
  	int rc;
  
  	if (!scrq) {
  		netdev_dbg(adapter->netdev, "Invalid scrq reset.\n");
  		return -EINVAL;
  	}
  
  	if (scrq->irq) {
  		free_irq(scrq->irq, scrq);
  		irq_dispose_mapping(scrq->irq);
  		scrq->irq = 0;
  	}
  
  	if (scrq->msgs) {
  		memset(scrq->msgs, 0, 4 * PAGE_SIZE);
  		atomic_set(&scrq->used, 0);
  		scrq->cur = 0;
  		scrq->ind_buf.index = 0;
  	} else {
  		netdev_dbg(adapter->netdev, "Invalid scrq reset\n");
  		return -EINVAL;
  	}
  
  	rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
  			   4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);
  	return rc;
  }
  
  static int reset_sub_crq_queues(struct ibmvnic_adapter *adapter)
  {
  	int i, rc;
  
  	if (!adapter->tx_scrq || !adapter->rx_scrq)
  		return -EINVAL;
  
  	for (i = 0; i < adapter->req_tx_queues; i++) {
  		netdev_dbg(adapter->netdev, "Re-setting tx_scrq[%d]\n", i);
  		rc = reset_one_sub_crq_queue(adapter, adapter->tx_scrq[i]);
  		if (rc)
  			return rc;
  	}
  
  	for (i = 0; i < adapter->req_rx_queues; i++) {
  		netdev_dbg(adapter->netdev, "Re-setting rx_scrq[%d]\n", i);
  		rc = reset_one_sub_crq_queue(adapter, adapter->rx_scrq[i]);
  		if (rc)
  			return rc;
  	}
  
  	return rc;
  }
  
  static void release_sub_crq_queue(struct ibmvnic_adapter *adapter,
  				  struct ibmvnic_sub_crq_queue *scrq,
  				  bool do_h_free)
  {
  	struct device *dev = &adapter->vdev->dev;
  	long rc;
  
  	netdev_dbg(adapter->netdev, "Releasing sub-CRQ\n");
  
  	if (do_h_free) {
  		/* Close the sub-crqs */
  		do {
  			rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
  						adapter->vdev->unit_address,
  						scrq->crq_num);
  		} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
  
  		if (rc) {
  			netdev_err(adapter->netdev,
  				   "Failed to release sub-CRQ %16lx, rc = %ld\n",
  				   scrq->crq_num, rc);
  		}
  	}
  
  	dma_free_coherent(dev,
  			  IBMVNIC_IND_ARR_SZ,
  			  scrq->ind_buf.indir_arr,
  			  scrq->ind_buf.indir_dma);
  
  	dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
  			 DMA_BIDIRECTIONAL);
  	free_pages((unsigned long)scrq->msgs, 2);
  	kfree(scrq);
  }
  
  static struct ibmvnic_sub_crq_queue *init_sub_crq_queue(struct ibmvnic_adapter
  							*adapter)
  {
  	struct device *dev = &adapter->vdev->dev;
  	struct ibmvnic_sub_crq_queue *scrq;
  	int rc;
  
  	scrq = kzalloc(sizeof(*scrq), GFP_KERNEL);
  	if (!scrq)
  		return NULL;
  
  	scrq->msgs =
  		(union sub_crq *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 2);
  	if (!scrq->msgs) {
  		dev_warn(dev, "Couldn't allocate crq queue messages page\n");
  		goto zero_page_failed;
  	}
  
  	scrq->msg_token = dma_map_single(dev, scrq->msgs, 4 * PAGE_SIZE,
  					 DMA_BIDIRECTIONAL);
  	if (dma_mapping_error(dev, scrq->msg_token)) {
  		dev_warn(dev, "Couldn't map crq queue messages page\n");
  		goto map_failed;
  	}
  
  	rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
  			   4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);
  
  	if (rc == H_RESOURCE)
  		rc = ibmvnic_reset_crq(adapter);
  
  	if (rc == H_CLOSED) {
  		dev_warn(dev, "Partner adapter not ready, waiting.\n");
  	} else if (rc) {
  		dev_warn(dev, "Error %d registering sub-crq\n", rc);
  		goto reg_failed;
  	}
  
  	scrq->adapter = adapter;
  	scrq->size = 4 * PAGE_SIZE / sizeof(*scrq->msgs);
  	scrq->ind_buf.index = 0;
  
  	scrq->ind_buf.indir_arr =
  		dma_alloc_coherent(dev,
  				   IBMVNIC_IND_ARR_SZ,
  				   &scrq->ind_buf.indir_dma,
  				   GFP_KERNEL);
  
  	if (!scrq->ind_buf.indir_arr)
  		goto indir_failed;
  
  	spin_lock_init(&scrq->lock);
  
  	netdev_dbg(adapter->netdev,
  		   "sub-crq initialized, num %lx, hw_irq=%lx, irq=%x\n",
  		   scrq->crq_num, scrq->hw_irq, scrq->irq);
  
  	return scrq;
  
  indir_failed:
  	do {
  		rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
  					adapter->vdev->unit_address,
  					scrq->crq_num);
  	} while (rc == H_BUSY || rc == H_IS_LONG_BUSY(rc));
  reg_failed:
  	dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
  			 DMA_BIDIRECTIONAL);
  map_failed:
  	free_pages((unsigned long)scrq->msgs, 2);
  zero_page_failed:
  	kfree(scrq);
  
  	return NULL;
  }
  
  static void release_sub_crqs(struct ibmvnic_adapter *adapter, bool do_h_free)
  {
  	int i;
  
  	if (adapter->tx_scrq) {
  		for (i = 0; i < adapter->num_active_tx_scrqs; i++) {
  			if (!adapter->tx_scrq[i])
  				continue;
  
  			netdev_dbg(adapter->netdev, "Releasing tx_scrq[%d]\n",
  				   i);
  			ibmvnic_tx_scrq_clean_buffer(adapter, adapter->tx_scrq[i]);
  			if (adapter->tx_scrq[i]->irq) {
  				free_irq(adapter->tx_scrq[i]->irq,
  					 adapter->tx_scrq[i]);
  				irq_dispose_mapping(adapter->tx_scrq[i]->irq);
  				adapter->tx_scrq[i]->irq = 0;
  			}
  
  			release_sub_crq_queue(adapter, adapter->tx_scrq[i],
  					      do_h_free);
  		}
  
  		kfree(adapter->tx_scrq);
  		adapter->tx_scrq = NULL;
  		adapter->num_active_tx_scrqs = 0;
  	}
  
  	if (adapter->rx_scrq) {
  		for (i = 0; i < adapter->num_active_rx_scrqs; i++) {
  			if (!adapter->rx_scrq[i])
  				continue;
  
  			netdev_dbg(adapter->netdev, "Releasing rx_scrq[%d]\n",
  				   i);
  			if (adapter->rx_scrq[i]->irq) {
  				free_irq(adapter->rx_scrq[i]->irq,
  					 adapter->rx_scrq[i]);
  				irq_dispose_mapping(adapter->rx_scrq[i]->irq);
  				adapter->rx_scrq[i]->irq = 0;
  			}
  
  			release_sub_crq_queue(adapter, adapter->rx_scrq[i],
  					      do_h_free);
  		}
  
  		kfree(adapter->rx_scrq);
  		adapter->rx_scrq = NULL;
  		adapter->num_active_rx_scrqs = 0;
  	}
  }
  
  static int disable_scrq_irq(struct ibmvnic_adapter *adapter,
  			    struct ibmvnic_sub_crq_queue *scrq)
  {
  	struct device *dev = &adapter->vdev->dev;
  	unsigned long rc;
  
  	rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
  				H_DISABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
  	if (rc)
  		dev_err(dev, "Couldn't disable scrq irq 0x%lx. rc=%ld\n",
  			scrq->hw_irq, rc);
  	return rc;
  }
  
  static int enable_scrq_irq(struct ibmvnic_adapter *adapter,
  			   struct ibmvnic_sub_crq_queue *scrq)
  {
  	struct device *dev = &adapter->vdev->dev;
  	unsigned long rc;
  
  	if (scrq->hw_irq > 0x100000000ULL) {
  		dev_err(dev, "bad hw_irq = %lx\n", scrq->hw_irq);
  		return 1;
  	}
  
  	if (test_bit(0, &adapter->resetting) &&
  	    adapter->reset_reason == VNIC_RESET_MOBILITY) {
  		u64 val = (0xff000000) | scrq->hw_irq;
  
  		rc = plpar_hcall_norets(H_EOI, val);
  		/* H_EOI would fail with rc = H_FUNCTION when running
  		 * in XIVE mode which is expected, but not an error.
  		 */
  		if (rc && (rc != H_FUNCTION))
  			dev_err(dev, "H_EOI FAILED irq 0x%llx. rc=%ld\n",
  				val, rc);
  	}
  
  	rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
  				H_ENABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
  	if (rc)
  		dev_err(dev, "Couldn't enable scrq irq 0x%lx. rc=%ld\n",
  			scrq->hw_irq, rc);
  	return rc;
  }
  
  static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
  			       struct ibmvnic_sub_crq_queue *scrq)
  {
  	struct device *dev = &adapter->vdev->dev;
  	struct ibmvnic_tx_pool *tx_pool;
  	struct ibmvnic_tx_buff *txbuff;
  	struct netdev_queue *txq;
  	union sub_crq *next;
  	int index;
  	int i;
  
  restart_loop:
  	while (pending_scrq(adapter, scrq)) {
  		unsigned int pool = scrq->pool_index;
  		int num_entries = 0;
  		int total_bytes = 0;
  		int num_packets = 0;
  
  		next = ibmvnic_next_scrq(adapter, scrq);
  		for (i = 0; i < next->tx_comp.num_comps; i++) {
  			index = be32_to_cpu(next->tx_comp.correlators[i]);
  			if (index & IBMVNIC_TSO_POOL_MASK) {
  				tx_pool = &adapter->tso_pool[pool];
  				index &= ~IBMVNIC_TSO_POOL_MASK;
  			} else {
  				tx_pool = &adapter->tx_pool[pool];
  			}
  
  			txbuff = &tx_pool->tx_buff[index];
  			num_packets++;
  			num_entries += txbuff->num_entries;
  			if (txbuff->skb) {
  				total_bytes += txbuff->skb->len;
  				if (next->tx_comp.rcs[i]) {
  					dev_err(dev, "tx error %x\n",
  						next->tx_comp.rcs[i]);
  					dev_kfree_skb_irq(txbuff->skb);
  				} else {
  					dev_consume_skb_irq(txbuff->skb);
  				}
  				txbuff->skb = NULL;
  			} else {
  				netdev_warn(adapter->netdev,
  					    "TX completion received with NULL socket buffer\n");
  			}
  			tx_pool->free_map[tx_pool->producer_index] = index;
  			tx_pool->producer_index =
  				(tx_pool->producer_index + 1) %
  					tx_pool->num_buffers;
  		}
  		/* remove tx_comp scrq*/
  		next->tx_comp.first = 0;
  
  		txq = netdev_get_tx_queue(adapter->netdev, scrq->pool_index);
  		netdev_tx_completed_queue(txq, num_packets, total_bytes);
  
  		if (atomic_sub_return(num_entries, &scrq->used) <=
  		    (adapter->req_tx_entries_per_subcrq / 2) &&
  		    __netif_subqueue_stopped(adapter->netdev,
  					     scrq->pool_index)) {
  			netif_wake_subqueue(adapter->netdev, scrq->pool_index);
  			netdev_dbg(adapter->netdev, "Started queue %d\n",
  				   scrq->pool_index);
  		}
  	}
  
  	enable_scrq_irq(adapter, scrq);
  
  	if (pending_scrq(adapter, scrq)) {
  		disable_scrq_irq(adapter, scrq);
  		goto restart_loop;
  	}
  
  	return 0;
  }
  
  static irqreturn_t ibmvnic_interrupt_tx(int irq, void *instance)
  {
  	struct ibmvnic_sub_crq_queue *scrq = instance;
  	struct ibmvnic_adapter *adapter = scrq->adapter;
  
  	disable_scrq_irq(adapter, scrq);
  	ibmvnic_complete_tx(adapter, scrq);
  
  	return IRQ_HANDLED;
  }
  
  static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance)
  {
  	struct ibmvnic_sub_crq_queue *scrq = instance;
  	struct ibmvnic_adapter *adapter = scrq->adapter;
  
  	/* When booting a kdump kernel we can hit pending interrupts
  	 * prior to completing driver initialization.
  	 */
  	if (unlikely(adapter->state != VNIC_OPEN))
  		return IRQ_NONE;
  
  	adapter->rx_stats_buffers[scrq->scrq_num].interrupts++;
  
  	if (napi_schedule_prep(&adapter->napi[scrq->scrq_num])) {
  		disable_scrq_irq(adapter, scrq);
  		__napi_schedule(&adapter->napi[scrq->scrq_num]);
  	}
  
  	return IRQ_HANDLED;
  }
  
  static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter)
  {
  	struct device *dev = &adapter->vdev->dev;
  	struct ibmvnic_sub_crq_queue *scrq;
  	int i = 0, j = 0;
  	int rc = 0;
  
  	for (i = 0; i < adapter->req_tx_queues; i++) {
  		netdev_dbg(adapter->netdev, "Initializing tx_scrq[%d] irq\n",
  			   i);
  		scrq = adapter->tx_scrq[i];
  		scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
  
  		if (!scrq->irq) {
  			rc = -EINVAL;
  			dev_err(dev, "Error mapping irq\n");
  			goto req_tx_irq_failed;
  		}
  
  		snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-tx%d",
  			 adapter->vdev->unit_address, i);
  		rc = request_irq(scrq->irq, ibmvnic_interrupt_tx,
  				 0, scrq->name, scrq);
  
  		if (rc) {
  			dev_err(dev, "Couldn't register tx irq 0x%x. rc=%d\n",
  				scrq->irq, rc);
  			irq_dispose_mapping(scrq->irq);
  			goto req_tx_irq_failed;
  		}
  	}
  
  	for (i = 0; i < adapter->req_rx_queues; i++) {
  		netdev_dbg(adapter->netdev, "Initializing rx_scrq[%d] irq\n",
  			   i);
  		scrq = adapter->rx_scrq[i];
  		scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
  		if (!scrq->irq) {
  			rc = -EINVAL;
  			dev_err(dev, "Error mapping irq\n");
  			goto req_rx_irq_failed;
  		}
  		snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-rx%d",
  			 adapter->vdev->unit_address, i);
  		rc = request_irq(scrq->irq, ibmvnic_interrupt_rx,
  				 0, scrq->name, scrq);
  		if (rc) {
  			dev_err(dev, "Couldn't register rx irq 0x%x. rc=%d\n",
  				scrq->irq, rc);
  			irq_dispose_mapping(scrq->irq);
  			goto req_rx_irq_failed;
  		}
  	}
  	return rc;
  
  req_rx_irq_failed:
  	for (j = 0; j < i; j++) {
  		free_irq(adapter->rx_scrq[j]->irq, adapter->rx_scrq[j]);
  		irq_dispose_mapping(adapter->rx_scrq[j]->irq);
  	}
  	i = adapter->req_tx_queues;
  req_tx_irq_failed:
  	for (j = 0; j < i; j++) {
  		free_irq(adapter->tx_scrq[j]->irq, adapter->tx_scrq[j]);
  		irq_dispose_mapping(adapter->tx_scrq[j]->irq);
  	}
  	release_sub_crqs(adapter, 1);
  	return rc;
  }
  
  static int init_sub_crqs(struct ibmvnic_adapter *adapter)
  {
  	struct device *dev = &adapter->vdev->dev;
  	struct ibmvnic_sub_crq_queue **allqueues;
  	int registered_queues = 0;
  	int total_queues;
  	int more = 0;
  	int i;
  
  	total_queues = adapter->req_tx_queues + adapter->req_rx_queues;
  
  	allqueues = kcalloc(total_queues, sizeof(*allqueues), GFP_KERNEL);
  	if (!allqueues)
  		return -1;
  
  	for (i = 0; i < total_queues; i++) {
  		allqueues[i] = init_sub_crq_queue(adapter);
  		if (!allqueues[i]) {
  			dev_warn(dev, "Couldn't allocate all sub-crqs\n");
  			break;
  		}
  		registered_queues++;
  	}
  
  	/* Make sure we were able to register the minimum number of queues */
  	if (registered_queues <
  	    adapter->min_tx_queues + adapter->min_rx_queues) {
  		dev_err(dev, "Fatal: Couldn't init  min number of sub-crqs\n");
  		goto tx_failed;
  	}
  
  	/* Distribute the failed allocated queues*/
  	for (i = 0; i < total_queues - registered_queues + more ; i++) {
  		netdev_dbg(adapter->netdev, "Reducing number of queues\n");
  		switch (i % 3) {
  		case 0:
  			if (adapter->req_rx_queues > adapter->min_rx_queues)
  				adapter->req_rx_queues--;
  			else
  				more++;
  			break;
  		case 1:
  			if (adapter->req_tx_queues > adapter->min_tx_queues)
  				adapter->req_tx_queues--;
  			else
  				more++;
  			break;
  		}
  	}
  
  	adapter->tx_scrq = kcalloc(adapter->req_tx_queues,
  				   sizeof(*adapter->tx_scrq), GFP_KERNEL);
  	if (!adapter->tx_scrq)
  		goto tx_failed;
  
  	for (i = 0; i < adapter->req_tx_queues; i++) {
  		adapter->tx_scrq[i] = allqueues[i];
  		adapter->tx_scrq[i]->pool_index = i;
  		adapter->num_active_tx_scrqs++;
  	}
  
  	adapter->rx_scrq = kcalloc(adapter->req_rx_queues,
  				   sizeof(*adapter->rx_scrq), GFP_KERNEL);
  	if (!adapter->rx_scrq)
  		goto rx_failed;
  
  	for (i = 0; i < adapter->req_rx_queues; i++) {
  		adapter->rx_scrq[i] = allqueues[i + adapter->req_tx_queues];
  		adapter->rx_scrq[i]->scrq_num = i;
  		adapter->num_active_rx_scrqs++;
  	}
  
  	kfree(allqueues);
  	return 0;
  
  rx_failed:
  	kfree(adapter->tx_scrq);
  	adapter->tx_scrq = NULL;
  tx_failed:
  	for (i = 0; i < registered_queues; i++)
  		release_sub_crq_queue(adapter, allqueues[i], 1);
  	kfree(allqueues);
  	return -1;
  }
  
  static void send_request_cap(struct ibmvnic_adapter *adapter, int retry)
  {
  	struct device *dev = &adapter->vdev->dev;
  	union ibmvnic_crq crq;
  	int max_entries;
  
  	if (!retry) {
  		/* Sub-CRQ entries are 32 byte long */
  		int entries_page = 4 * PAGE_SIZE / (sizeof(u64) * 4);
  
  		if (adapter->min_tx_entries_per_subcrq > entries_page ||
  		    adapter->min_rx_add_entries_per_subcrq > entries_page) {
  			dev_err(dev, "Fatal, invalid entries per sub-crq\n");
  			return;
  		}
  
  		if (adapter->desired.mtu)
  			adapter->req_mtu = adapter->desired.mtu;
  		else
  			adapter->req_mtu = adapter->netdev->mtu + ETH_HLEN;
  
  		if (!adapter->desired.tx_entries)
  			adapter->desired.tx_entries =
  					adapter->max_tx_entries_per_subcrq;
  		if (!adapter->desired.rx_entries)
  			adapter->desired.rx_entries =
  					adapter->max_rx_add_entries_per_subcrq;
  
  		max_entries = IBMVNIC_MAX_LTB_SIZE /
  			      (adapter->req_mtu + IBMVNIC_BUFFER_HLEN);
  
  		if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) *
  			adapter->desired.tx_entries > IBMVNIC_MAX_LTB_SIZE) {
  			adapter->desired.tx_entries = max_entries;
  		}
  
  		if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) *
  			adapter->desired.rx_entries > IBMVNIC_MAX_LTB_SIZE) {
  			adapter->desired.rx_entries = max_entries;
  		}
  
  		if (adapter->desired.tx_entries)
  			adapter->req_tx_entries_per_subcrq =
  					adapter->desired.tx_entries;
  		else
  			adapter->req_tx_entries_per_subcrq =
  					adapter->max_tx_entries_per_subcrq;
  
  		if (adapter->desired.rx_entries)
  			adapter->req_rx_add_entries_per_subcrq =
  					adapter->desired.rx_entries;
  		else
  			adapter->req_rx_add_entries_per_subcrq =
  					adapter->max_rx_add_entries_per_subcrq;
  
  		if (adapter->desired.tx_queues)
  			adapter->req_tx_queues =
  					adapter->desired.tx_queues;
  		else
  			adapter->req_tx_queues =
  					adapter->opt_tx_comp_sub_queues;
  
  		if (adapter->desired.rx_queues)
  			adapter->req_rx_queues =
  					adapter->desired.rx_queues;
  		else
  			adapter->req_rx_queues =
  					adapter->opt_rx_comp_queues;
  
  		adapter->req_rx_add_queues = adapter->max_rx_add_queues;
  	}
  
  	memset(&crq, 0, sizeof(crq));
  	crq.request_capability.first = IBMVNIC_CRQ_CMD;
  	crq.request_capability.cmd = REQUEST_CAPABILITY;
  
  	crq.request_capability.capability = cpu_to_be16(REQ_TX_QUEUES);
  	crq.request_capability.number = cpu_to_be64(adapter->req_tx_queues);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.request_capability.capability = cpu_to_be16(REQ_RX_QUEUES);
  	crq.request_capability.number = cpu_to_be64(adapter->req_rx_queues);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.request_capability.capability = cpu_to_be16(REQ_RX_ADD_QUEUES);
  	crq.request_capability.number = cpu_to_be64(adapter->req_rx_add_queues);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.request_capability.capability =
  	    cpu_to_be16(REQ_TX_ENTRIES_PER_SUBCRQ);
  	crq.request_capability.number =
  	    cpu_to_be64(adapter->req_tx_entries_per_subcrq);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.request_capability.capability =
  	    cpu_to_be16(REQ_RX_ADD_ENTRIES_PER_SUBCRQ);
  	crq.request_capability.number =
  	    cpu_to_be64(adapter->req_rx_add_entries_per_subcrq);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.request_capability.capability = cpu_to_be16(REQ_MTU);
  	crq.request_capability.number = cpu_to_be64(adapter->req_mtu);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	if (adapter->netdev->flags & IFF_PROMISC) {
  		if (adapter->promisc_supported) {
  			crq.request_capability.capability =
  			    cpu_to_be16(PROMISC_REQUESTED);
  			crq.request_capability.number = cpu_to_be64(1);
  			atomic_inc(&adapter->running_cap_crqs);
  			ibmvnic_send_crq(adapter, &crq);
  		}
  	} else {
  		crq.request_capability.capability =
  		    cpu_to_be16(PROMISC_REQUESTED);
  		crq.request_capability.number = cpu_to_be64(0);
  		atomic_inc(&adapter->running_cap_crqs);
  		ibmvnic_send_crq(adapter, &crq);
  	}
  }
  
  static int pending_scrq(struct ibmvnic_adapter *adapter,
  			struct ibmvnic_sub_crq_queue *scrq)
  {
  	union sub_crq *entry = &scrq->msgs[scrq->cur];
  	int rc;
  
  	rc = !!(entry->generic.first & IBMVNIC_CRQ_CMD_RSP);
  
  	/* Ensure that the SCRQ valid flag is loaded prior to loading the
  	 * contents of the SCRQ descriptor
  	 */
  	dma_rmb();
  
  	return rc;
  }
  
  static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *adapter,
  					struct ibmvnic_sub_crq_queue *scrq)
  {
  	union sub_crq *entry;
  	unsigned long flags;
  
  	spin_lock_irqsave(&scrq->lock, flags);
  	entry = &scrq->msgs[scrq->cur];
  	if (entry->generic.first & IBMVNIC_CRQ_CMD_RSP) {
  		if (++scrq->cur == scrq->size)
  			scrq->cur = 0;
  	} else {
  		entry = NULL;
  	}
  	spin_unlock_irqrestore(&scrq->lock, flags);
  
  	/* Ensure that the SCRQ valid flag is loaded prior to loading the
  	 * contents of the SCRQ descriptor
  	 */
  	dma_rmb();
  
  	return entry;
  }
  
  static union ibmvnic_crq *ibmvnic_next_crq(struct ibmvnic_adapter *adapter)
  {
  	struct ibmvnic_crq_queue *queue = &adapter->crq;
  	union ibmvnic_crq *crq;
  
  	crq = &queue->msgs[queue->cur];
  	if (crq->generic.first & IBMVNIC_CRQ_CMD_RSP) {
  		if (++queue->cur == queue->size)
  			queue->cur = 0;
  	} else {
  		crq = NULL;
  	}
  
  	return crq;
  }
  
  static void print_subcrq_error(struct device *dev, int rc, const char *func)
  {
  	switch (rc) {
  	case H_PARAMETER:
  		dev_warn_ratelimited(dev,
  				     "%s failed: Send request is malformed or adapter failover pending. (rc=%d)\n",
  				     func, rc);
  		break;
  	case H_CLOSED:
  		dev_warn_ratelimited(dev,
  				     "%s failed: Backing queue closed. Adapter is down or failover pending. (rc=%d)\n",
  				     func, rc);
  		break;
  	default:
  		dev_err_ratelimited(dev, "%s failed: (rc=%d)\n", func, rc);
  		break;
  	}
  }
  
  static int send_subcrq_indirect(struct ibmvnic_adapter *adapter,
  				u64 remote_handle, u64 ioba, u64 num_entries)
  {
  	unsigned int ua = adapter->vdev->unit_address;
  	struct device *dev = &adapter->vdev->dev;
  	int rc;
  
  	/* Make sure the hypervisor sees the complete request */
  	dma_wmb();
  	rc = plpar_hcall_norets(H_SEND_SUB_CRQ_INDIRECT, ua,
  				cpu_to_be64(remote_handle),
  				ioba, num_entries);
  
  	if (rc)
  		print_subcrq_error(dev, rc, __func__);
  
  	return rc;
  }
  
  static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter,
  			    union ibmvnic_crq *crq)
  {
  	unsigned int ua = adapter->vdev->unit_address;
  	struct device *dev = &adapter->vdev->dev;
  	u64 *u64_crq = (u64 *)crq;
  	int rc;
  
  	netdev_dbg(adapter->netdev, "Sending CRQ: %016lx %016lx\n",
  		   (unsigned long)cpu_to_be64(u64_crq[0]),
  		   (unsigned long)cpu_to_be64(u64_crq[1]));
  
  	if (!adapter->crq.active &&
  	    crq->generic.first != IBMVNIC_CRQ_INIT_CMD) {
  		dev_warn(dev, "Invalid request detected while CRQ is inactive, possible device state change during reset\n");
  		return -EINVAL;
  	}
  
  	/* Make sure the hypervisor sees the complete request */
  	dma_wmb();
  
  	rc = plpar_hcall_norets(H_SEND_CRQ, ua,
  				cpu_to_be64(u64_crq[0]),
  				cpu_to_be64(u64_crq[1]));
  
  	if (rc) {
  		if (rc == H_CLOSED) {
  			dev_warn(dev, "CRQ Queue closed\n");
  			/* do not reset, report the fail, wait for passive init from server */
  		}
  
  		dev_warn(dev, "Send error (rc=%d)\n", rc);
  	}
  
  	return rc;
  }
  
  static int ibmvnic_send_crq_init(struct ibmvnic_adapter *adapter)
  {
  	struct device *dev = &adapter->vdev->dev;
  	union ibmvnic_crq crq;
  	int retries = 100;
  	int rc;
  
  	memset(&crq, 0, sizeof(crq));
  	crq.generic.first = IBMVNIC_CRQ_INIT_CMD;
  	crq.generic.cmd = IBMVNIC_CRQ_INIT;
  	netdev_dbg(adapter->netdev, "Sending CRQ init\n");
  
  	do {
  		rc = ibmvnic_send_crq(adapter, &crq);
  		if (rc != H_CLOSED)
  			break;
  		retries--;
  		msleep(50);
  
  	} while (retries > 0);
  
  	if (rc) {
  		dev_err(dev, "Failed to send init request, rc = %d\n", rc);
  		return rc;
  	}
  
  	return 0;
  }
  
  struct vnic_login_client_data {
  	u8	type;
  	__be16	len;
  	char	name[];
  } __packed;
  
  static int vnic_client_data_len(struct ibmvnic_adapter *adapter)
  {
  	int len;
  
  	/* Calculate the amount of buffer space needed for the
  	 * vnic client data in the login buffer. There are four entries,
  	 * OS name, LPAR name, device name, and a null last entry.
  	 */
  	len = 4 * sizeof(struct vnic_login_client_data);
  	len += 6; /* "Linux" plus NULL */
  	len += strlen(utsname()->nodename) + 1;
  	len += strlen(adapter->netdev->name) + 1;
  
  	return len;
  }
  
  static void vnic_add_client_data(struct ibmvnic_adapter *adapter,
  				 struct vnic_login_client_data *vlcd)
  {
  	const char *os_name = "Linux";
  	int len;
  
  	/* Type 1 - LPAR OS */
  	vlcd->type = 1;
  	len = strlen(os_name) + 1;
  	vlcd->len = cpu_to_be16(len);
  	strscpy(vlcd->name, os_name, len);
  	vlcd = (struct vnic_login_client_data *)(vlcd->name + len);
  
  	/* Type 2 - LPAR name */
  	vlcd->type = 2;
  	len = strlen(utsname()->nodename) + 1;
  	vlcd->len = cpu_to_be16(len);
  	strscpy(vlcd->name, utsname()->nodename, len);
  	vlcd = (struct vnic_login_client_data *)(vlcd->name + len);
  
  	/* Type 3 - device name */
  	vlcd->type = 3;
  	len = strlen(adapter->netdev->name) + 1;
  	vlcd->len = cpu_to_be16(len);
  	strscpy(vlcd->name, adapter->netdev->name, len);
  }
  
  static int send_login(struct ibmvnic_adapter *adapter)
  {
  	struct ibmvnic_login_rsp_buffer *login_rsp_buffer;
  	struct ibmvnic_login_buffer *login_buffer;
  	struct device *dev = &adapter->vdev->dev;
  	struct vnic_login_client_data *vlcd;
  	dma_addr_t rsp_buffer_token;
  	dma_addr_t buffer_token;
  	size_t rsp_buffer_size;
  	union ibmvnic_crq crq;
  	int client_data_len;
  	size_t buffer_size;
  	__be64 *tx_list_p;
  	__be64 *rx_list_p;
  	int rc;
  	int i;
  
  	if (!adapter->tx_scrq || !adapter->rx_scrq) {
  		netdev_err(adapter->netdev,
  			   "RX or TX queues are not allocated, device login failed\n");
  		return -1;
  	}
  
  	release_login_buffer(adapter);
  	release_login_rsp_buffer(adapter);
  
  	client_data_len = vnic_client_data_len(adapter);
  
  	buffer_size =
  	    sizeof(struct ibmvnic_login_buffer) +
  	    sizeof(u64) * (adapter->req_tx_queues + adapter->req_rx_queues) +
  	    client_data_len;
  
  	login_buffer = kzalloc(buffer_size, GFP_ATOMIC);
  	if (!login_buffer)
  		goto buf_alloc_failed;
  
  	buffer_token = dma_map_single(dev, login_buffer, buffer_size,
  				      DMA_TO_DEVICE);
  	if (dma_mapping_error(dev, buffer_token)) {
  		dev_err(dev, "Couldn't map login buffer\n");
  		goto buf_map_failed;
  	}
  
  	rsp_buffer_size = sizeof(struct ibmvnic_login_rsp_buffer) +
  			  sizeof(u64) * adapter->req_tx_queues +
  			  sizeof(u64) * adapter->req_rx_queues +
  			  sizeof(u64) * adapter->req_rx_queues +
  			  sizeof(u8) * IBMVNIC_TX_DESC_VERSIONS;
  
  	login_rsp_buffer = kmalloc(rsp_buffer_size, GFP_ATOMIC);
  	if (!login_rsp_buffer)
  		goto buf_rsp_alloc_failed;
  
  	rsp_buffer_token = dma_map_single(dev, login_rsp_buffer,
  					  rsp_buffer_size, DMA_FROM_DEVICE);
  	if (dma_mapping_error(dev, rsp_buffer_token)) {
  		dev_err(dev, "Couldn't map login rsp buffer\n");
  		goto buf_rsp_map_failed;
  	}
  
  	adapter->login_buf = login_buffer;
  	adapter->login_buf_token = buffer_token;
  	adapter->login_buf_sz = buffer_size;
  	adapter->login_rsp_buf = login_rsp_buffer;
  	adapter->login_rsp_buf_token = rsp_buffer_token;
  	adapter->login_rsp_buf_sz = rsp_buffer_size;
  
  	login_buffer->len = cpu_to_be32(buffer_size);
  	login_buffer->version = cpu_to_be32(INITIAL_VERSION_LB);
  	login_buffer->num_txcomp_subcrqs = cpu_to_be32(adapter->req_tx_queues);
  	login_buffer->off_txcomp_subcrqs =
  	    cpu_to_be32(sizeof(struct ibmvnic_login_buffer));
  	login_buffer->num_rxcomp_subcrqs = cpu_to_be32(adapter->req_rx_queues);
  	login_buffer->off_rxcomp_subcrqs =
  	    cpu_to_be32(sizeof(struct ibmvnic_login_buffer) +
  			sizeof(u64) * adapter->req_tx_queues);
  	login_buffer->login_rsp_ioba = cpu_to_be32(rsp_buffer_token);
  	login_buffer->login_rsp_len = cpu_to_be32(rsp_buffer_size);
  
  	tx_list_p = (__be64 *)((char *)login_buffer +
  				      sizeof(struct ibmvnic_login_buffer));
  	rx_list_p = (__be64 *)((char *)login_buffer +
  				      sizeof(struct ibmvnic_login_buffer) +
  				      sizeof(u64) * adapter->req_tx_queues);
  
  	for (i = 0; i < adapter->req_tx_queues; i++) {
  		if (adapter->tx_scrq[i]) {
  			tx_list_p[i] =
  				cpu_to_be64(adapter->tx_scrq[i]->crq_num);
  		}
  	}
  
  	for (i = 0; i < adapter->req_rx_queues; i++) {
  		if (adapter->rx_scrq[i]) {
  			rx_list_p[i] =
  				cpu_to_be64(adapter->rx_scrq[i]->crq_num);
  		}
  	}
  
  	/* Insert vNIC login client data */
  	vlcd = (struct vnic_login_client_data *)
  		((char *)rx_list_p + (sizeof(u64) * adapter->req_rx_queues));
  	login_buffer->client_data_offset =
  			cpu_to_be32((char *)vlcd - (char *)login_buffer);
  	login_buffer->client_data_len = cpu_to_be32(client_data_len);
  
  	vnic_add_client_data(adapter, vlcd);
  
  	netdev_dbg(adapter->netdev, "Login Buffer:\n");
  	for (i = 0; i < (adapter->login_buf_sz - 1) / 8 + 1; i++) {
  		netdev_dbg(adapter->netdev, "%016lx\n",
  			   ((unsigned long *)(adapter->login_buf))[i]);
  	}
  
  	memset(&crq, 0, sizeof(crq));
  	crq.login.first = IBMVNIC_CRQ_CMD;
  	crq.login.cmd = LOGIN;
  	crq.login.ioba = cpu_to_be32(buffer_token);
  	crq.login.len = cpu_to_be32(buffer_size);
  
  	adapter->login_pending = true;
  	rc = ibmvnic_send_crq(adapter, &crq);
  	if (rc) {
  		adapter->login_pending = false;
  		netdev_err(adapter->netdev, "Failed to send login, rc=%d\n", rc);
  		goto buf_rsp_map_failed;
  	}
  
  	return 0;
  
  buf_rsp_map_failed:
  	kfree(login_rsp_buffer);
  	adapter->login_rsp_buf = NULL;
  buf_rsp_alloc_failed:
  	dma_unmap_single(dev, buffer_token, buffer_size, DMA_TO_DEVICE);
  buf_map_failed:
  	kfree(login_buffer);
  	adapter->login_buf = NULL;
  buf_alloc_failed:
  	return -1;
  }
  
  static int send_request_map(struct ibmvnic_adapter *adapter, dma_addr_t addr,
  			    u32 len, u8 map_id)
  {
  	union ibmvnic_crq crq;
  
  	memset(&crq, 0, sizeof(crq));
  	crq.request_map.first = IBMVNIC_CRQ_CMD;
  	crq.request_map.cmd = REQUEST_MAP;
  	crq.request_map.map_id = map_id;
  	crq.request_map.ioba = cpu_to_be32(addr);
  	crq.request_map.len = cpu_to_be32(len);
  	return ibmvnic_send_crq(adapter, &crq);
  }
  
  static int send_request_unmap(struct ibmvnic_adapter *adapter, u8 map_id)
  {
  	union ibmvnic_crq crq;
  
  	memset(&crq, 0, sizeof(crq));
  	crq.request_unmap.first = IBMVNIC_CRQ_CMD;
  	crq.request_unmap.cmd = REQUEST_UNMAP;
  	crq.request_unmap.map_id = map_id;
  	return ibmvnic_send_crq(adapter, &crq);
  }
  
  static void send_query_map(struct ibmvnic_adapter *adapter)
  {
  	union ibmvnic_crq crq;
  
  	memset(&crq, 0, sizeof(crq));
  	crq.query_map.first = IBMVNIC_CRQ_CMD;
  	crq.query_map.cmd = QUERY_MAP;
  	ibmvnic_send_crq(adapter, &crq);
  }
  
  /* Send a series of CRQs requesting various capabilities of the VNIC server */
  static void send_query_cap(struct ibmvnic_adapter *adapter)
  {
  	union ibmvnic_crq crq;
  
  	atomic_set(&adapter->running_cap_crqs, 0);
  	memset(&crq, 0, sizeof(crq));
  	crq.query_capability.first = IBMVNIC_CRQ_CMD;
  	crq.query_capability.cmd = QUERY_CAPABILITY;
  
  	crq.query_capability.capability = cpu_to_be16(MIN_TX_QUEUES);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(MIN_RX_QUEUES);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(MIN_RX_ADD_QUEUES);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(MAX_TX_QUEUES);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(MAX_RX_QUEUES);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(MAX_RX_ADD_QUEUES);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability =
  	    cpu_to_be16(MIN_TX_ENTRIES_PER_SUBCRQ);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability =
  	    cpu_to_be16(MIN_RX_ADD_ENTRIES_PER_SUBCRQ);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability =
  	    cpu_to_be16(MAX_TX_ENTRIES_PER_SUBCRQ);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability =
  	    cpu_to_be16(MAX_RX_ADD_ENTRIES_PER_SUBCRQ);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(TCP_IP_OFFLOAD);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(PROMISC_SUPPORTED);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(MIN_MTU);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(MAX_MTU);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(MAX_MULTICAST_FILTERS);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(VLAN_HEADER_INSERTION);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(RX_VLAN_HEADER_INSERTION);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(MAX_TX_SG_ENTRIES);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(RX_SG_SUPPORTED);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(OPT_TX_COMP_SUB_QUEUES);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(OPT_RX_COMP_QUEUES);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability =
  			cpu_to_be16(OPT_RX_BUFADD_Q_PER_RX_COMP_Q);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability =
  			cpu_to_be16(OPT_TX_ENTRIES_PER_SUBCRQ);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability =
  			cpu_to_be16(OPT_RXBA_ENTRIES_PER_SUBCRQ);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  
  	crq.query_capability.capability = cpu_to_be16(TX_RX_DESC_REQ);
  	atomic_inc(&adapter->running_cap_crqs);
  	ibmvnic_send_crq(adapter, &crq);
  }
  
  static void send_query_ip_offload(struct ibmvnic_adapter *adapter)
  {
  	int buf_sz = sizeof(struct ibmvnic_query_ip_offload_buffer);
  	struct device *dev = &adapter->vdev->dev;
  	union ibmvnic_crq crq;
  
  	adapter->ip_offload_tok =
  		dma_map_single(dev,
  			       &adapter->ip_offload_buf,
  			       buf_sz,
  			       DMA_FROM_DEVICE);
  
  	if (dma_mapping_error(dev, adapter->ip_offload_tok)) {
  		if (!firmware_has_feature(FW_FEATURE_CMO))
  			dev_err(dev, "Couldn't map offload buffer\n");
  		return;
  	}
  
  	memset(&crq, 0, sizeof(crq));
  	crq.query_ip_offload.first = IBMVNIC_CRQ_CMD;
  	crq.query_ip_offload.cmd = QUERY_IP_OFFLOAD;
  	crq.query_ip_offload.len = cpu_to_be32(buf_sz);
  	crq.query_ip_offload.ioba =
  	    cpu_to_be32(adapter->ip_offload_tok);
  
  	ibmvnic_send_crq(adapter, &crq);
  }
  
  static void send_control_ip_offload(struct ibmvnic_adapter *adapter)
  {
  	struct ibmvnic_control_ip_offload_buffer *ctrl_buf = &adapter->ip_offload_ctrl;
  	struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
  	struct device *dev = &adapter->vdev->dev;
  	netdev_features_t old_hw_features = 0;
  	union ibmvnic_crq crq;
  
  	adapter->ip_offload_ctrl_tok =
  		dma_map_single(dev,
  			       ctrl_buf,
  			       sizeof(adapter->ip_offload_ctrl),
  			       DMA_TO_DEVICE);
  
  	if (dma_mapping_error(dev, adapter->ip_offload_ctrl_tok)) {
  		dev_err(dev, "Couldn't map ip offload control buffer\n");
  		return;
  	}
  
  	ctrl_buf->len = cpu_to_be32(sizeof(adapter->ip_offload_ctrl));
  	ctrl_buf->version = cpu_to_be32(INITIAL_VERSION_IOB);
  	ctrl_buf->ipv4_chksum = buf->ipv4_chksum;
  	ctrl_buf->ipv6_chksum = buf->ipv6_chksum;
  	ctrl_buf->tcp_ipv4_chksum = buf->tcp_ipv4_chksum;
  	ctrl_buf->udp_ipv4_chksum = buf->udp_ipv4_chksum;
  	ctrl_buf->tcp_ipv6_chksum = buf->tcp_ipv6_chksum;
  	ctrl_buf->udp_ipv6_chksum = buf->udp_ipv6_chksum;
  	ctrl_buf->large_tx_ipv4 = buf->large_tx_ipv4;
  	ctrl_buf->large_tx_ipv6 = buf->large_tx_ipv6;
  
  	/* large_rx disabled for now, additional features needed */
  	ctrl_buf->large_rx_ipv4 = 0;
  	ctrl_buf->large_rx_ipv6 = 0;
  
  	if (adapter->state != VNIC_PROBING) {
  		old_hw_features = adapter->netdev->hw_features;
  		adapter->netdev->hw_features = 0;
  	}
  
  	adapter->netdev->hw_features = NETIF_F_SG | NETIF_F_GSO | NETIF_F_GRO;
  
  	if (buf->tcp_ipv4_chksum || buf->udp_ipv4_chksum)
  		adapter->netdev->hw_features |= NETIF_F_IP_CSUM;
  
  	if (buf->tcp_ipv6_chksum || buf->udp_ipv6_chksum)
  		adapter->netdev->hw_features |= NETIF_F_IPV6_CSUM;
  
  	if ((adapter->netdev->features &
  	    (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)))
  		adapter->netdev->hw_features |= NETIF_F_RXCSUM;
  
  	if (buf->large_tx_ipv4)
  		adapter->netdev->hw_features |= NETIF_F_TSO;
  	if (buf->large_tx_ipv6)
  		adapter->netdev->hw_features |= NETIF_F_TSO6;
  
  	if (adapter->state == VNIC_PROBING) {
  		adapter->netdev->features |= adapter->netdev->hw_features;
  	} else if (old_hw_features != adapter->netdev->hw_features) {
  		netdev_features_t tmp = 0;
  
  		/* disable features no longer supported */
  		adapter->netdev->features &= adapter->netdev->hw_features;
  		/* turn on features now supported if previously enabled */
  		tmp = (old_hw_features ^ adapter->netdev->hw_features) &
  			adapter->netdev->hw_features;
  		adapter->netdev->features |=
  				tmp & adapter->netdev->wanted_features;
  	}
  
  	memset(&crq, 0, sizeof(crq));
  	crq.control_ip_offload.first = IBMVNIC_CRQ_CMD;
  	crq.control_ip_offload.cmd = CONTROL_IP_OFFLOAD;
  	crq.control_ip_offload.len =
  	    cpu_to_be32(sizeof(adapter->ip_offload_ctrl));
  	crq.control_ip_offload.ioba = cpu_to_be32(adapter->ip_offload_ctrl_tok);
  	ibmvnic_send_crq(adapter, &crq);
  }
  
  static void handle_vpd_size_rsp(union ibmvnic_crq *crq,
  				struct ibmvnic_adapter *adapter)
  {
  	struct device *dev = &adapter->vdev->dev;
  
  	if (crq->get_vpd_size_rsp.rc.code) {
  		dev_err(dev, "Error retrieving VPD size, rc=%x\n",
  			crq->get_vpd_size_rsp.rc.code);
  		complete(&adapter->fw_done);
  		return;
  	}
  
  	adapter->vpd->len = be64_to_cpu(crq->get_vpd_size_rsp.len);
  	complete(&adapter->fw_done);
  }
  
  static void handle_vpd_rsp(union ibmvnic_crq *crq,
  			   struct ibmvnic_adapter *adapter)
  {
  	struct device *dev = &adapter->vdev->dev;
  	unsigned char *substr = NULL;
  	u8 fw_level_len = 0;
  
  	memset(adapter->fw_version, 0, 32);
  
  	dma_unmap_single(dev, adapter->vpd->dma_addr, adapter->vpd->len,
  			 DMA_FROM_DEVICE);
  
  	if (crq->get_vpd_rsp.rc.code) {
  		dev_err(dev, "Error retrieving VPD from device, rc=%x\n",
  			crq->get_vpd_rsp.rc.code);
  		goto complete;
  	}
  
  	/* get the position of the firmware version info
  	 * located after the ASCII 'RM' substring in the buffer
  	 */
  	substr = strnstr(adapter->vpd->buff, "RM", adapter->vpd->len);
  	if (!substr) {
  		dev_info(dev, "Warning - No FW level has been provided in the VPD buffer by the VIOS Server\n");
  		goto complete;
  	}
  
  	/* get length of firmware level ASCII substring */
  	if ((substr + 2) < (adapter->vpd->buff + adapter->vpd->len)) {
  		fw_level_len = *(substr + 2);
  	} else {
  		dev_info(dev, "Length of FW substr extrapolated VDP buff\n");
  		goto complete;
  	}
  
  	/* copy firmware version string from vpd into adapter */
  	if ((substr + 3 + fw_level_len) <
  	    (adapter->vpd->buff + adapter->vpd->len)) {
  		strncpy((char *)adapter->fw_version, substr + 3, fw_level_len);
  	} else {
  		dev_info(dev, "FW substr extrapolated VPD buff\n");
  	}
  
  complete:
  	if (adapter->fw_version[0] == '\0')
  		strscpy((char *)adapter->fw_version, "N/A", sizeof(adapter->fw_version));
  	complete(&adapter->fw_done);
  }
  
  static void handle_query_ip_offload_rsp(struct ibmvnic_adapter *adapter)
  {
  	struct device *dev = &adapter->vdev->dev;
  	struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
  	int i;
  
  	dma_unmap_single(dev, adapter->ip_offload_tok,
  			 sizeof(adapter->ip_offload_buf), DMA_FROM_DEVICE);
  
  	netdev_dbg(adapter->netdev, "Query IP Offload Buffer:\n");
  	for (i = 0; i < (sizeof(adapter->ip_offload_buf) - 1) / 8 + 1; i++)
  		netdev_dbg(adapter->netdev, "%016lx\n",
  			   ((unsigned long *)(buf))[i]);
  
  	netdev_dbg(adapter->netdev, "ipv4_chksum = %d\n", buf->ipv4_chksum);
  	netdev_dbg(adapter->netdev, "ipv6_chksum = %d\n", buf->ipv6_chksum);
  	netdev_dbg(adapter->netdev, "tcp_ipv4_chksum = %d\n",
  		   buf->tcp_ipv4_chksum);
  	netdev_dbg(adapter->netdev, "tcp_ipv6_chksum = %d\n",
  		   buf->tcp_ipv6_chksum);
  	netdev_dbg(adapter->netdev, "udp_ipv4_chksum = %d\n",
  		   buf->udp_ipv4_chksum);
  	netdev_dbg(adapter->netdev, "udp_ipv6_chksum = %d\n",
  		   buf->udp_ipv6_chksum);
  	netdev_dbg(adapter->netdev, "large_tx_ipv4 = %d\n",
  		   buf->large_tx_ipv4);
  	netdev_dbg(adapter->netdev, "large_tx_ipv6 = %d\n",
  		   buf->large_tx_ipv6);
  	netdev_dbg(adapter->netdev, "large_rx_ipv4 = %d\n",
  		   buf->large_rx_ipv4);
  	netdev_dbg(adapter->netdev, "large_rx_ipv6 = %d\n",
  		   buf->large_rx_ipv6);
  	netdev_dbg(adapter->netdev, "max_ipv4_hdr_sz = %d\n",
  		   buf->max_ipv4_header_size);
  	netdev_dbg(adapter->netdev, "max_ipv6_hdr_sz = %d\n",
  		   buf->max_ipv6_header_size);
  	netdev_dbg(adapter->netdev, "max_tcp_hdr_size = %d\n",
  		   buf->max_tcp_header_size);
  	netdev_dbg(adapter->netdev, "max_udp_hdr_size = %d\n",
  		   buf->max_udp_header_size);
  	netdev_dbg(adapter->netdev, "max_large_tx_size = %d\n",
  		   buf->max_large_tx_size);
  	netdev_dbg(adapter->netdev, "max_large_rx_size = %d\n",
  		   buf->max_large_rx_size);
  	netdev_dbg(adapter->netdev, "ipv6_ext_hdr = %d\n",
  		   buf->ipv6_extension_header);
  	netdev_dbg(adapter->netdev, "tcp_pseudosum_req = %d\n",
  		   buf->tcp_pseudosum_req);
  	netdev_dbg(adapter->netdev, "num_ipv6_ext_hd = %d\n",
  		   buf->num_ipv6_ext_headers);
  	netdev_dbg(adapter->netdev, "off_ipv6_ext_hd = %d\n",
  		   buf->off_ipv6_ext_headers);
  
  	send_control_ip_offload(adapter);
  }
  
  static const char *ibmvnic_fw_err_cause(u16 cause)
  {
  	switch (cause) {
  	case ADAPTER_PROBLEM:
  		return "adapter problem";
  	case BUS_PROBLEM:
  		return "bus problem";
  	case FW_PROBLEM:
  		return "firmware problem";
  	case DD_PROBLEM:
  		return "device driver problem";
  	case EEH_RECOVERY:
  		return "EEH recovery";
  	case FW_UPDATED:
  		return "firmware updated";
  	case LOW_MEMORY:
  		return "low Memory";
  	default:
  		return "unknown";
  	}
  }
  
  static void handle_error_indication(union ibmvnic_crq *crq,
  				    struct ibmvnic_adapter *adapter)
  {
  	struct device *dev = &adapter->vdev->dev;
  	u16 cause;
  
  	cause = be16_to_cpu(crq->error_indication.error_cause);
  
  	dev_warn_ratelimited(dev,
  			     "Firmware reports %serror, cause: %s. Starting recovery...\n",
  			     crq->error_indication.flags
  				& IBMVNIC_FATAL_ERROR ? "FATAL " : "",
  			     ibmvnic_fw_err_cause(cause));
  
  	if (crq->error_indication.flags & IBMVNIC_FATAL_ERROR)
  		ibmvnic_reset(adapter, VNIC_RESET_FATAL);
  	else
  		ibmvnic_reset(adapter, VNIC_RESET_NON_FATAL);
  }
  
  static int handle_change_mac_rsp(union ibmvnic_crq *crq,
  				 struct ibmvnic_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	struct device *dev = &adapter->vdev->dev;
  	long rc;
  
  	rc = crq->change_mac_addr_rsp.rc.code;
  	if (rc) {
  		dev_err(dev, "Error %ld in CHANGE_MAC_ADDR_RSP\n", rc);
  		goto out;
  	}
  	/* crq->change_mac_addr.mac_addr is the requested one
  	 * crq->change_mac_addr_rsp.mac_addr is the returned valid one.
  	 */
  	ether_addr_copy(netdev->dev_addr,
  			&crq->change_mac_addr_rsp.mac_addr[0]);
  	ether_addr_copy(adapter->mac_addr,
  			&crq->change_mac_addr_rsp.mac_addr[0]);
  out:
  	complete(&adapter->fw_done);
  	return rc;
  }
  
  static void handle_request_cap_rsp(union ibmvnic_crq *crq,
  				   struct ibmvnic_adapter *adapter)
  {
  	struct device *dev = &adapter->vdev->dev;
  	u64 *req_value;
  	char *name;
  
  	atomic_dec(&adapter->running_cap_crqs);
  	switch (be16_to_cpu(crq->request_capability_rsp.capability)) {
  	case REQ_TX_QUEUES:
  		req_value = &adapter->req_tx_queues;
  		name = "tx";
  		break;
  	case REQ_RX_QUEUES:
  		req_value = &adapter->req_rx_queues;
  		name = "rx";
  		break;
  	case REQ_RX_ADD_QUEUES:
  		req_value = &adapter->req_rx_add_queues;
  		name = "rx_add";
  		break;
  	case REQ_TX_ENTRIES_PER_SUBCRQ:
  		req_value = &adapter->req_tx_entries_per_subcrq;
  		name = "tx_entries_per_subcrq";
  		break;
  	case REQ_RX_ADD_ENTRIES_PER_SUBCRQ:
  		req_value = &adapter->req_rx_add_entries_per_subcrq;
  		name = "rx_add_entries_per_subcrq";
  		break;
  	case REQ_MTU:
  		req_value = &adapter->req_mtu;
  		name = "mtu";
  		break;
  	case PROMISC_REQUESTED:
  		req_value = &adapter->promisc;
  		name = "promisc";
  		break;
  	default:
  		dev_err(dev, "Got invalid cap request rsp %d\n",
  			crq->request_capability.capability);
  		return;
  	}
  
  	switch (crq->request_capability_rsp.rc.code) {
  	case SUCCESS:
  		break;
  	case PARTIALSUCCESS:
  		dev_info(dev, "req=%lld, rsp=%ld in %s queue, retrying.\n",
  			 *req_value,
  			 (long)be64_to_cpu(crq->request_capability_rsp.number),
  			 name);
  
  		if (be16_to_cpu(crq->request_capability_rsp.capability) ==
  		    REQ_MTU) {
  			pr_err("mtu of %llu is not supported. Reverting.\n",
  			       *req_value);
  			*req_value = adapter->fallback.mtu;
  		} else {
  			*req_value =
  				be64_to_cpu(crq->request_capability_rsp.number);
  		}
  
  		send_request_cap(adapter, 1);
  		return;
  	default:
  		dev_err(dev, "Error %d in request cap rsp\n",
  			crq->request_capability_rsp.rc.code);
  		return;
  	}
  
  	/* Done receiving requested capabilities, query IP offload support */
  	if (atomic_read(&adapter->running_cap_crqs) == 0) {
  		adapter->wait_capability = false;
  		send_query_ip_offload(adapter);
  	}
  }
  
  static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq,
  			    struct ibmvnic_adapter *adapter)
  {
  	struct device *dev = &adapter->vdev->dev;
  	struct net_device *netdev = adapter->netdev;
  	struct ibmvnic_login_rsp_buffer *login_rsp = adapter->login_rsp_buf;
  	struct ibmvnic_login_buffer *login = adapter->login_buf;
  	u64 *tx_handle_array;
  	u64 *rx_handle_array;
  	int num_tx_pools;
  	int num_rx_pools;
  	u64 *size_array;
  	int i;
  
  	/* CHECK: Test/set of login_pending does not need to be atomic
  	 * because only ibmvnic_tasklet tests/clears this.
  	 */
  	if (!adapter->login_pending) {
  		netdev_warn(netdev, "Ignoring unexpected login response\n");
  		return 0;
  	}
  	adapter->login_pending = false;
  
  	dma_unmap_single(dev, adapter->login_buf_token, adapter->login_buf_sz,
  			 DMA_TO_DEVICE);
  	dma_unmap_single(dev, adapter->login_rsp_buf_token,
  			 adapter->login_rsp_buf_sz, DMA_FROM_DEVICE);
  
  	/* If the number of queues requested can't be allocated by the
  	 * server, the login response will return with code 1. We will need
  	 * to resend the login buffer with fewer queues requested.
  	 */
  	if (login_rsp_crq->generic.rc.code) {
  		adapter->init_done_rc = login_rsp_crq->generic.rc.code;
  		complete(&adapter->init_done);
  		return 0;
  	}
  
  	if (adapter->failover_pending) {
  		adapter->init_done_rc = -EAGAIN;
  		netdev_dbg(netdev, "Failover pending, ignoring login response\n");
  		complete(&adapter->init_done);
  		/* login response buffer will be released on reset */
  		return 0;
  	}
  
  	netdev->mtu = adapter->req_mtu - ETH_HLEN;
  
  	netdev_dbg(adapter->netdev, "Login Response Buffer:\n");
  	for (i = 0; i < (adapter->login_rsp_buf_sz - 1) / 8 + 1; i++) {
  		netdev_dbg(adapter->netdev, "%016lx\n",
  			   ((unsigned long *)(adapter->login_rsp_buf))[i]);
  	}
  
  	/* Sanity checks */
  	if (login->num_txcomp_subcrqs != login_rsp->num_txsubm_subcrqs ||
  	    (be32_to_cpu(login->num_rxcomp_subcrqs) *
  	     adapter->req_rx_add_queues !=
  	     be32_to_cpu(login_rsp->num_rxadd_subcrqs))) {
  		dev_err(dev, "FATAL: Inconsistent login and login rsp\n");
  		ibmvnic_reset(adapter, VNIC_RESET_FATAL);
  		return -EIO;
  	}
  	size_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
  		be32_to_cpu(adapter->login_rsp_buf->off_rxadd_buff_size));
  	/* variable buffer sizes are not supported, so just read the
  	 * first entry.
  	 */
  	adapter->cur_rx_buf_sz = be64_to_cpu(size_array[0]);
  
  	num_tx_pools = be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs);
  	num_rx_pools = be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
  
  	tx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
  				  be32_to_cpu(adapter->login_rsp_buf->off_txsubm_subcrqs));
  	rx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
  				  be32_to_cpu(adapter->login_rsp_buf->off_rxadd_subcrqs));
  
  	for (i = 0; i < num_tx_pools; i++)
  		adapter->tx_scrq[i]->handle = tx_handle_array[i];
  
  	for (i = 0; i < num_rx_pools; i++)
  		adapter->rx_scrq[i]->handle = rx_handle_array[i];
  
  	adapter->num_active_tx_scrqs = num_tx_pools;
  	adapter->num_active_rx_scrqs = num_rx_pools;
  	release_login_rsp_buffer(adapter);
  	release_login_buffer(adapter);
  	complete(&adapter->init_done);
  
  	return 0;
  }
  
  static void handle_request_unmap_rsp(union ibmvnic_crq *crq,
  				     struct ibmvnic_adapter *adapter)
  {
  	struct device *dev = &adapter->vdev->dev;
  	long rc;
  
  	rc = crq->request_unmap_rsp.rc.code;
  	if (rc)
  		dev_err(dev, "Error %ld in REQUEST_UNMAP_RSP\n", rc);
  }
  
  static void handle_query_map_rsp(union ibmvnic_crq *crq,
  				 struct ibmvnic_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	struct device *dev = &adapter->vdev->dev;
  	long rc;
  
  	rc = crq->query_map_rsp.rc.code;
  	if (rc) {
  		dev_err(dev, "Error %ld in QUERY_MAP_RSP\n", rc);
  		return;
  	}
  	netdev_dbg(netdev, "page_size = %d\ntot_pages = %d\nfree_pages = %d\n",
  		   crq->query_map_rsp.page_size, crq->query_map_rsp.tot_pages,
  		   crq->query_map_rsp.free_pages);
  }
  
  static void handle_query_cap_rsp(union ibmvnic_crq *crq,
  				 struct ibmvnic_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	struct device *dev = &adapter->vdev->dev;
  	long rc;
  
  	atomic_dec(&adapter->running_cap_crqs);
  	netdev_dbg(netdev, "Outstanding queries: %d\n",
  		   atomic_read(&adapter->running_cap_crqs));
  	rc = crq->query_capability.rc.code;
  	if (rc) {
  		dev_err(dev, "Error %ld in QUERY_CAP_RSP\n", rc);
  		goto out;
  	}
  
  	switch (be16_to_cpu(crq->query_capability.capability)) {
  	case MIN_TX_QUEUES:
  		adapter->min_tx_queues =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "min_tx_queues = %lld\n",
  			   adapter->min_tx_queues);
  		break;
  	case MIN_RX_QUEUES:
  		adapter->min_rx_queues =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "min_rx_queues = %lld\n",
  			   adapter->min_rx_queues);
  		break;
  	case MIN_RX_ADD_QUEUES:
  		adapter->min_rx_add_queues =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "min_rx_add_queues = %lld\n",
  			   adapter->min_rx_add_queues);
  		break;
  	case MAX_TX_QUEUES:
  		adapter->max_tx_queues =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "max_tx_queues = %lld\n",
  			   adapter->max_tx_queues);
  		break;
  	case MAX_RX_QUEUES:
  		adapter->max_rx_queues =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "max_rx_queues = %lld\n",
  			   adapter->max_rx_queues);
  		break;
  	case MAX_RX_ADD_QUEUES:
  		adapter->max_rx_add_queues =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "max_rx_add_queues = %lld\n",
  			   adapter->max_rx_add_queues);
  		break;
  	case MIN_TX_ENTRIES_PER_SUBCRQ:
  		adapter->min_tx_entries_per_subcrq =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "min_tx_entries_per_subcrq = %lld\n",
  			   adapter->min_tx_entries_per_subcrq);
  		break;
  	case MIN_RX_ADD_ENTRIES_PER_SUBCRQ:
  		adapter->min_rx_add_entries_per_subcrq =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "min_rx_add_entrs_per_subcrq = %lld\n",
  			   adapter->min_rx_add_entries_per_subcrq);
  		break;
  	case MAX_TX_ENTRIES_PER_SUBCRQ:
  		adapter->max_tx_entries_per_subcrq =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "max_tx_entries_per_subcrq = %lld\n",
  			   adapter->max_tx_entries_per_subcrq);
  		break;
  	case MAX_RX_ADD_ENTRIES_PER_SUBCRQ:
  		adapter->max_rx_add_entries_per_subcrq =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "max_rx_add_entrs_per_subcrq = %lld\n",
  			   adapter->max_rx_add_entries_per_subcrq);
  		break;
  	case TCP_IP_OFFLOAD:
  		adapter->tcp_ip_offload =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "tcp_ip_offload = %lld\n",
  			   adapter->tcp_ip_offload);
  		break;
  	case PROMISC_SUPPORTED:
  		adapter->promisc_supported =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "promisc_supported = %lld\n",
  			   adapter->promisc_supported);
  		break;
  	case MIN_MTU:
  		adapter->min_mtu = be64_to_cpu(crq->query_capability.number);
  		netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
  		netdev_dbg(netdev, "min_mtu = %lld\n", adapter->min_mtu);
  		break;
  	case MAX_MTU:
  		adapter->max_mtu = be64_to_cpu(crq->query_capability.number);
  		netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
  		netdev_dbg(netdev, "max_mtu = %lld\n", adapter->max_mtu);
  		break;
  	case MAX_MULTICAST_FILTERS:
  		adapter->max_multicast_filters =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "max_multicast_filters = %lld\n",
  			   adapter->max_multicast_filters);
  		break;
  	case VLAN_HEADER_INSERTION:
  		adapter->vlan_header_insertion =
  		    be64_to_cpu(crq->query_capability.number);
  		if (adapter->vlan_header_insertion)
  			netdev->features |= NETIF_F_HW_VLAN_STAG_TX;
  		netdev_dbg(netdev, "vlan_header_insertion = %lld\n",
  			   adapter->vlan_header_insertion);
  		break;
  	case RX_VLAN_HEADER_INSERTION:
  		adapter->rx_vlan_header_insertion =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "rx_vlan_header_insertion = %lld\n",
  			   adapter->rx_vlan_header_insertion);
  		break;
  	case MAX_TX_SG_ENTRIES:
  		adapter->max_tx_sg_entries =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "max_tx_sg_entries = %lld\n",
  			   adapter->max_tx_sg_entries);
  		break;
  	case RX_SG_SUPPORTED:
  		adapter->rx_sg_supported =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "rx_sg_supported = %lld\n",
  			   adapter->rx_sg_supported);
  		break;
  	case OPT_TX_COMP_SUB_QUEUES:
  		adapter->opt_tx_comp_sub_queues =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "opt_tx_comp_sub_queues = %lld\n",
  			   adapter->opt_tx_comp_sub_queues);
  		break;
  	case OPT_RX_COMP_QUEUES:
  		adapter->opt_rx_comp_queues =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "opt_rx_comp_queues = %lld\n",
  			   adapter->opt_rx_comp_queues);
  		break;
  	case OPT_RX_BUFADD_Q_PER_RX_COMP_Q:
  		adapter->opt_rx_bufadd_q_per_rx_comp_q =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "opt_rx_bufadd_q_per_rx_comp_q = %lld\n",
  			   adapter->opt_rx_bufadd_q_per_rx_comp_q);
  		break;
  	case OPT_TX_ENTRIES_PER_SUBCRQ:
  		adapter->opt_tx_entries_per_subcrq =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "opt_tx_entries_per_subcrq = %lld\n",
  			   adapter->opt_tx_entries_per_subcrq);
  		break;
  	case OPT_RXBA_ENTRIES_PER_SUBCRQ:
  		adapter->opt_rxba_entries_per_subcrq =
  		    be64_to_cpu(crq->query_capability.number);
  		netdev_dbg(netdev, "opt_rxba_entries_per_subcrq = %lld\n",
  			   adapter->opt_rxba_entries_per_subcrq);
  		break;
  	case TX_RX_DESC_REQ:
  		adapter->tx_rx_desc_req = crq->query_capability.number;
  		netdev_dbg(netdev, "tx_rx_desc_req = %llx\n",
  			   adapter->tx_rx_desc_req);
  		break;
  
  	default:
  		netdev_err(netdev, "Got invalid cap rsp %d\n",
  			   crq->query_capability.capability);
  	}
  
  out:
  	if (atomic_read(&adapter->running_cap_crqs) == 0) {
  		adapter->wait_capability = false;
  		send_request_cap(adapter, 0);
  	}
  }
  
  static int send_query_phys_parms(struct ibmvnic_adapter *adapter)
  {
  	union ibmvnic_crq crq;
  	int rc;
  
  	memset(&crq, 0, sizeof(crq));
  	crq.query_phys_parms.first = IBMVNIC_CRQ_CMD;
  	crq.query_phys_parms.cmd = QUERY_PHYS_PARMS;
  
  	mutex_lock(&adapter->fw_lock);
  	adapter->fw_done_rc = 0;
  	reinit_completion(&adapter->fw_done);
  
  	rc = ibmvnic_send_crq(adapter, &crq);
  	if (rc) {
  		mutex_unlock(&adapter->fw_lock);
  		return rc;
  	}
  
  	rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
  	if (rc) {
  		mutex_unlock(&adapter->fw_lock);
  		return rc;
  	}
  
  	mutex_unlock(&adapter->fw_lock);
  	return adapter->fw_done_rc ? -EIO : 0;
  }
  
  static int handle_query_phys_parms_rsp(union ibmvnic_crq *crq,
  				       struct ibmvnic_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	int rc;
  	__be32 rspeed = cpu_to_be32(crq->query_phys_parms_rsp.speed);
  
  	rc = crq->query_phys_parms_rsp.rc.code;
  	if (rc) {
  		netdev_err(netdev, "Error %d in QUERY_PHYS_PARMS\n", rc);
  		return rc;
  	}
  	switch (rspeed) {
  	case IBMVNIC_10MBPS:
  		adapter->speed = SPEED_10;
  		break;
  	case IBMVNIC_100MBPS:
  		adapter->speed = SPEED_100;
  		break;
  	case IBMVNIC_1GBPS:
  		adapter->speed = SPEED_1000;
  		break;
  	case IBMVNIC_10GBPS:
  		adapter->speed = SPEED_10000;
  		break;
  	case IBMVNIC_25GBPS:
  		adapter->speed = SPEED_25000;
  		break;
  	case IBMVNIC_40GBPS:
  		adapter->speed = SPEED_40000;
  		break;
  	case IBMVNIC_50GBPS:
  		adapter->speed = SPEED_50000;
  		break;
  	case IBMVNIC_100GBPS:
  		adapter->speed = SPEED_100000;
  		break;
  	case IBMVNIC_200GBPS:
  		adapter->speed = SPEED_200000;
  		break;
  	default:
  		if (netif_carrier_ok(netdev))
  			netdev_warn(netdev, "Unknown speed 0x%08x\n", rspeed);
  		adapter->speed = SPEED_UNKNOWN;
  	}
  	if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_FULL_DUPLEX)
  		adapter->duplex = DUPLEX_FULL;
  	else if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_HALF_DUPLEX)
  		adapter->duplex = DUPLEX_HALF;
  	else
  		adapter->duplex = DUPLEX_UNKNOWN;
  
  	return rc;
  }
  
  static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
  			       struct ibmvnic_adapter *adapter)
  {
  	struct ibmvnic_generic_crq *gen_crq = &crq->generic;
  	struct net_device *netdev = adapter->netdev;
  	struct device *dev = &adapter->vdev->dev;
  	u64 *u64_crq = (u64 *)crq;
  	long rc;
  
  	netdev_dbg(netdev, "Handling CRQ: %016lx %016lx\n",
  		   (unsigned long)cpu_to_be64(u64_crq[0]),
  		   (unsigned long)cpu_to_be64(u64_crq[1]));
  	switch (gen_crq->first) {
  	case IBMVNIC_CRQ_INIT_RSP:
  		switch (gen_crq->cmd) {
  		case IBMVNIC_CRQ_INIT:
  			dev_info(dev, "Partner initialized\n");
  			adapter->from_passive_init = true;
  			/* Discard any stale login responses from prev reset.
  			 * CHECK: should we clear even on INIT_COMPLETE?
  			 */
  			adapter->login_pending = false;
  
  			if (adapter->state == VNIC_DOWN)
  				rc = ibmvnic_reset(adapter, VNIC_RESET_PASSIVE_INIT);
  			else
  				rc = ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
  
  			if (rc && rc != -EBUSY) {
  				/* We were unable to schedule the failover
  				 * reset either because the adapter was still
  				 * probing (eg: during kexec) or we could not
  				 * allocate memory. Clear the failover_pending
  				 * flag since no one else will. We ignore
  				 * EBUSY because it means either FAILOVER reset
  				 * is already scheduled or the adapter is
  				 * being removed.
  				 */
  				netdev_err(netdev,
  					   "Error %ld scheduling failover reset\n",
  					   rc);
  				adapter->failover_pending = false;
  			}
  
  			if (!completion_done(&adapter->init_done)) {
  				complete(&adapter->init_done);
  				if (!adapter->init_done_rc)
  					adapter->init_done_rc = -EAGAIN;
  			}
  
  			break;
  		case IBMVNIC_CRQ_INIT_COMPLETE:
  			dev_info(dev, "Partner initialization complete\n");
  			adapter->crq.active = true;
  			send_version_xchg(adapter);
  			break;
  		default:
  			dev_err(dev, "Unknown crq cmd: %d\n", gen_crq->cmd);
  		}
  		return;
  	case IBMVNIC_CRQ_XPORT_EVENT:
  		netif_carrier_off(netdev);
  		adapter->crq.active = false;
  		/* terminate any thread waiting for a response
  		 * from the device
  		 */
  		if (!completion_done(&adapter->fw_done)) {
  			adapter->fw_done_rc = -EIO;
  			complete(&adapter->fw_done);
  		}
  		if (!completion_done(&adapter->stats_done))
  			complete(&adapter->stats_done);
  		if (test_bit(0, &adapter->resetting))
  			adapter->force_reset_recovery = true;
  		if (gen_crq->cmd == IBMVNIC_PARTITION_MIGRATED) {
  			dev_info(dev, "Migrated, re-enabling adapter\n");
  			ibmvnic_reset(adapter, VNIC_RESET_MOBILITY);
  		} else if (gen_crq->cmd == IBMVNIC_DEVICE_FAILOVER) {
  			dev_info(dev, "Backing device failover detected\n");
  			adapter->failover_pending = true;
  		} else {
  			/* The adapter lost the connection */
  			dev_err(dev, "Virtual Adapter failed (rc=%d)\n",
  				gen_crq->cmd);
  			ibmvnic_reset(adapter, VNIC_RESET_FATAL);
  		}
  		return;
  	case IBMVNIC_CRQ_CMD_RSP:
  		break;
  	default:
  		dev_err(dev, "Got an invalid msg type 0x%02x\n",
  			gen_crq->first);
  		return;
  	}
  
  	switch (gen_crq->cmd) {
  	case VERSION_EXCHANGE_RSP:
  		rc = crq->version_exchange_rsp.rc.code;
  		if (rc) {
  			dev_err(dev, "Error %ld in VERSION_EXCHG_RSP\n", rc);
  			break;
  		}
  		ibmvnic_version =
  			    be16_to_cpu(crq->version_exchange_rsp.version);
  		dev_info(dev, "Partner protocol version is %d\n",
  			 ibmvnic_version);
  		send_query_cap(adapter);
  		break;
  	case QUERY_CAPABILITY_RSP:
  		handle_query_cap_rsp(crq, adapter);
  		break;
  	case QUERY_MAP_RSP:
  		handle_query_map_rsp(crq, adapter);
  		break;
  	case REQUEST_MAP_RSP:
  		adapter->fw_done_rc = crq->request_map_rsp.rc.code;
  		complete(&adapter->fw_done);
  		break;
  	case REQUEST_UNMAP_RSP:
  		handle_request_unmap_rsp(crq, adapter);
  		break;
  	case REQUEST_CAPABILITY_RSP:
  		handle_request_cap_rsp(crq, adapter);
  		break;
  	case LOGIN_RSP:
  		netdev_dbg(netdev, "Got Login Response\n");
  		handle_login_rsp(crq, adapter);
  		break;
  	case LOGICAL_LINK_STATE_RSP:
  		netdev_dbg(netdev,
  			   "Got Logical Link State Response, state: %d rc: %d\n",
  			   crq->logical_link_state_rsp.link_state,
  			   crq->logical_link_state_rsp.rc.code);
  		adapter->logical_link_state =
  		    crq->logical_link_state_rsp.link_state;
  		adapter->init_done_rc = crq->logical_link_state_rsp.rc.code;
  		complete(&adapter->init_done);
  		break;
  	case LINK_STATE_INDICATION:
  		netdev_dbg(netdev, "Got Logical Link State Indication\n");
  		adapter->phys_link_state =
  		    crq->link_state_indication.phys_link_state;
  		adapter->logical_link_state =
  		    crq->link_state_indication.logical_link_state;
  		if (adapter->phys_link_state && adapter->logical_link_state)
  			netif_carrier_on(netdev);
  		else
  			netif_carrier_off(netdev);
  		break;
  	case CHANGE_MAC_ADDR_RSP:
  		netdev_dbg(netdev, "Got MAC address change Response\n");
  		adapter->fw_done_rc = handle_change_mac_rsp(crq, adapter);
  		break;
  	case ERROR_INDICATION:
  		netdev_dbg(netdev, "Got Error Indication\n");
  		handle_error_indication(crq, adapter);
  		break;
  	case REQUEST_STATISTICS_RSP:
  		netdev_dbg(netdev, "Got Statistics Response\n");
  		complete(&adapter->stats_done);
  		break;
  	case QUERY_IP_OFFLOAD_RSP:
  		netdev_dbg(netdev, "Got Query IP offload Response\n");
  		handle_query_ip_offload_rsp(adapter);
  		break;
  	case MULTICAST_CTRL_RSP:
  		netdev_dbg(netdev, "Got multicast control Response\n");
  		break;
  	case CONTROL_IP_OFFLOAD_RSP:
  		netdev_dbg(netdev, "Got Control IP offload Response\n");
  		dma_unmap_single(dev, adapter->ip_offload_ctrl_tok,
  				 sizeof(adapter->ip_offload_ctrl),
  				 DMA_TO_DEVICE);
  		complete(&adapter->init_done);
  		break;
  	case COLLECT_FW_TRACE_RSP:
  		netdev_dbg(netdev, "Got Collect firmware trace Response\n");
  		complete(&adapter->fw_done);
  		break;
  	case GET_VPD_SIZE_RSP:
  		handle_vpd_size_rsp(crq, adapter);
  		break;
  	case GET_VPD_RSP:
  		handle_vpd_rsp(crq, adapter);
  		break;
  	case QUERY_PHYS_PARMS_RSP:
  		adapter->fw_done_rc = handle_query_phys_parms_rsp(crq, adapter);
  		complete(&adapter->fw_done);
  		break;
  	default:
  		netdev_err(netdev, "Got an invalid cmd type 0x%02x\n",
  			   gen_crq->cmd);
  	}
  }
  
  static irqreturn_t ibmvnic_interrupt(int irq, void *instance)
  {
  	struct ibmvnic_adapter *adapter = instance;
  
  	tasklet_schedule(&adapter->tasklet);
  	return IRQ_HANDLED;
  }
  
  static void ibmvnic_tasklet(struct tasklet_struct *t)
  {
  	struct ibmvnic_adapter *adapter = from_tasklet(adapter, t, tasklet);
  	struct ibmvnic_crq_queue *queue = &adapter->crq;
  	union ibmvnic_crq *crq;
  	unsigned long flags;
  	bool done = false;
  
  	spin_lock_irqsave(&queue->lock, flags);
  	while (!done) {
  		/* Pull all the valid messages off the CRQ */
  		while ((crq = ibmvnic_next_crq(adapter)) != NULL) {
  			/* This barrier makes sure ibmvnic_next_crq()'s
  			 * crq->generic.first & IBMVNIC_CRQ_CMD_RSP is loaded
  			 * before ibmvnic_handle_crq()'s
  			 * switch(gen_crq->first) and switch(gen_crq->cmd).
  			 */
  			dma_rmb();
  			ibmvnic_handle_crq(crq, adapter);
  			crq->generic.first = 0;
  		}
  
  		/* remain in tasklet until all
  		 * capabilities responses are received
  		 */
  		if (!adapter->wait_capability)
  			done = true;
  	}
  	/* if capabilities CRQ's were sent in this tasklet, the following
  	 * tasklet must wait until all responses are received
  	 */
  	if (atomic_read(&adapter->running_cap_crqs) != 0)
  		adapter->wait_capability = true;
  	spin_unlock_irqrestore(&queue->lock, flags);
  }
  
  static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *adapter)
  {
  	struct vio_dev *vdev = adapter->vdev;
  	int rc;
  
  	do {
  		rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
  	} while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
  
  	if (rc)
  		dev_err(&vdev->dev, "Error enabling adapter (rc=%d)\n", rc);
  
  	return rc;
  }
  
  static int ibmvnic_reset_crq(struct ibmvnic_adapter *adapter)
  {
  	struct ibmvnic_crq_queue *crq = &adapter->crq;
  	struct device *dev = &adapter->vdev->dev;
  	struct vio_dev *vdev = adapter->vdev;
  	int rc;
  
  	/* Close the CRQ */
  	do {
  		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
  	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
  
  	/* Clean out the queue */
  	if (!crq->msgs)
  		return -EINVAL;
  
  	memset(crq->msgs, 0, PAGE_SIZE);
  	crq->cur = 0;
  	crq->active = false;
  
  	/* And re-open it again */
  	rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
  				crq->msg_token, PAGE_SIZE);
  
  	if (rc == H_CLOSED)
  		/* Adapter is good, but other end is not ready */
  		dev_warn(dev, "Partner adapter not ready\n");
  	else if (rc != 0)
  		dev_warn(dev, "Couldn't register crq (rc=%d)\n", rc);
  
  	return rc;
  }
  
  static void release_crq_queue(struct ibmvnic_adapter *adapter)
  {
  	struct ibmvnic_crq_queue *crq = &adapter->crq;
  	struct vio_dev *vdev = adapter->vdev;
  	long rc;
  
  	if (!crq->msgs)
  		return;
  
  	netdev_dbg(adapter->netdev, "Releasing CRQ\n");
  	free_irq(vdev->irq, adapter);
  	tasklet_kill(&adapter->tasklet);
  	do {
  		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
  	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
  
  	dma_unmap_single(&vdev->dev, crq->msg_token, PAGE_SIZE,
  			 DMA_BIDIRECTIONAL);
  	free_page((unsigned long)crq->msgs);
  	crq->msgs = NULL;
  	crq->active = false;
  }
  
  static int init_crq_queue(struct ibmvnic_adapter *adapter)
  {
  	struct ibmvnic_crq_queue *crq = &adapter->crq;
  	struct device *dev = &adapter->vdev->dev;
  	struct vio_dev *vdev = adapter->vdev;
  	int rc, retrc = -ENOMEM;
  
  	if (crq->msgs)
  		return 0;
  
  	crq->msgs = (union ibmvnic_crq *)get_zeroed_page(GFP_KERNEL);
  	/* Should we allocate more than one page? */
  
  	if (!crq->msgs)
  		return -ENOMEM;
  
  	crq->size = PAGE_SIZE / sizeof(*crq->msgs);
  	crq->msg_token = dma_map_single(dev, crq->msgs, PAGE_SIZE,
  					DMA_BIDIRECTIONAL);
  	if (dma_mapping_error(dev, crq->msg_token))
  		goto map_failed;
  
  	rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
  				crq->msg_token, PAGE_SIZE);
  
  	if (rc == H_RESOURCE)
  		/* maybe kexecing and resource is busy. try a reset */
  		rc = ibmvnic_reset_crq(adapter);
  	retrc = rc;
  
  	if (rc == H_CLOSED) {
  		dev_warn(dev, "Partner adapter not ready\n");
  	} else if (rc) {
  		dev_warn(dev, "Error %d opening adapter\n", rc);
  		goto reg_crq_failed;
  	}
  
  	retrc = 0;
  
  	tasklet_setup(&adapter->tasklet, (void *)ibmvnic_tasklet);
  
  	netdev_dbg(adapter->netdev, "registering irq 0x%x\n", vdev->irq);
  	snprintf(crq->name, sizeof(crq->name), "ibmvnic-%x",
  		 adapter->vdev->unit_address);
  	rc = request_irq(vdev->irq, ibmvnic_interrupt, 0, crq->name, adapter);
  	if (rc) {
  		dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n",
  			vdev->irq, rc);
  		goto req_irq_failed;
  	}
  
  	rc = vio_enable_interrupts(vdev);
  	if (rc) {
  		dev_err(dev, "Error %d enabling interrupts\n", rc);
  		goto req_irq_failed;
  	}
  
  	crq->cur = 0;
  	spin_lock_init(&crq->lock);
  
  	/* process any CRQs that were queued before we enabled interrupts */
  	tasklet_schedule(&adapter->tasklet);
  
  	return retrc;
  
  req_irq_failed:
  	tasklet_kill(&adapter->tasklet);
  	do {
  		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
  	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
  reg_crq_failed:
  	dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
  map_failed:
  	free_page((unsigned long)crq->msgs);
  	crq->msgs = NULL;
  	return retrc;
  }
  
  static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter, bool reset)
  {
  	struct device *dev = &adapter->vdev->dev;
  	unsigned long timeout = msecs_to_jiffies(20000);
  	u64 old_num_rx_queues = adapter->req_rx_queues;
  	u64 old_num_tx_queues = adapter->req_tx_queues;
  	int rc;
  
  	adapter->from_passive_init = false;
  
  	if (reset)
  		reinit_completion(&adapter->init_done);
  
  	adapter->init_done_rc = 0;
  	rc = ibmvnic_send_crq_init(adapter);
  	if (rc) {
  		dev_err(dev, "Send crq init failed with error %d\n", rc);
  		return rc;
  	}
  
  	if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
  		dev_err(dev, "Initialization sequence timed out\n");
  		return -1;
  	}
  
  	if (adapter->init_done_rc) {
  		release_crq_queue(adapter);
  		return adapter->init_done_rc;
  	}
  
  	if (adapter->from_passive_init) {
  		adapter->state = VNIC_OPEN;
  		adapter->from_passive_init = false;
  		return -1;
  	}
  
  	if (reset &&
  	    test_bit(0, &adapter->resetting) && !adapter->wait_for_reset &&
  	    adapter->reset_reason != VNIC_RESET_MOBILITY) {
  		if (adapter->req_rx_queues != old_num_rx_queues ||
  		    adapter->req_tx_queues != old_num_tx_queues) {
  			release_sub_crqs(adapter, 0);
  			rc = init_sub_crqs(adapter);
  		} else {
  			rc = reset_sub_crq_queues(adapter);
  		}
  	} else {
  		rc = init_sub_crqs(adapter);
  	}
  
  	if (rc) {
  		dev_err(dev, "Initialization of sub crqs failed\n");
  		release_crq_queue(adapter);
  		return rc;
  	}
  
  	rc = init_sub_crq_irqs(adapter);
  	if (rc) {
  		dev_err(dev, "Failed to initialize sub crq irqs\n");
  		release_crq_queue(adapter);
  	}
  
  	return rc;
  }
  
  static struct device_attribute dev_attr_failover;
  
  static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
  {
  	struct ibmvnic_adapter *adapter;
  	struct net_device *netdev;
  	unsigned char *mac_addr_p;
  	bool init_success;
  	int rc;
  
  	dev_dbg(&dev->dev, "entering ibmvnic_probe for UA 0x%x\n",
  		dev->unit_address);
  
  	mac_addr_p = (unsigned char *)vio_get_attribute(dev,
  							VETH_MAC_ADDR, NULL);
  	if (!mac_addr_p) {
  		dev_err(&dev->dev,
  			"(%s:%3.3d) ERROR: Can't find MAC_ADDR attribute\n",
  			__FILE__, __LINE__);
  		return 0;
  	}
  
  	netdev = alloc_etherdev_mq(sizeof(struct ibmvnic_adapter),
  				   IBMVNIC_MAX_QUEUES);
  	if (!netdev)
  		return -ENOMEM;
  
  	adapter = netdev_priv(netdev);
  	adapter->state = VNIC_PROBING;
  	dev_set_drvdata(&dev->dev, netdev);
  	adapter->vdev = dev;
  	adapter->netdev = netdev;
  	adapter->login_pending = false;
  
  	ether_addr_copy(adapter->mac_addr, mac_addr_p);
  	ether_addr_copy(netdev->dev_addr, adapter->mac_addr);
  	netdev->irq = dev->irq;
  	netdev->netdev_ops = &ibmvnic_netdev_ops;
  	netdev->ethtool_ops = &ibmvnic_ethtool_ops;
  	SET_NETDEV_DEV(netdev, &dev->dev);
  
  	INIT_WORK(&adapter->ibmvnic_reset, __ibmvnic_reset);
  	INIT_DELAYED_WORK(&adapter->ibmvnic_delayed_reset,
  			  __ibmvnic_delayed_reset);
  	INIT_LIST_HEAD(&adapter->rwi_list);
  	spin_lock_init(&adapter->rwi_lock);
  	spin_lock_init(&adapter->state_lock);
  	mutex_init(&adapter->fw_lock);
  	init_completion(&adapter->init_done);
  	init_completion(&adapter->fw_done);
  	init_completion(&adapter->reset_done);
  	init_completion(&adapter->stats_done);
  	clear_bit(0, &adapter->resetting);
  
  	init_success = false;
  	do {
  		rc = init_crq_queue(adapter);
  		if (rc) {
  			dev_err(&dev->dev, "Couldn't initialize crq. rc=%d\n",
  				rc);
  			goto ibmvnic_init_fail;
  		}
  
  		rc = ibmvnic_reset_init(adapter, false);
  	} while (rc == -EAGAIN);
  
  	/* We are ignoring the error from ibmvnic_reset_init() assuming that the
  	 * partner is not ready. CRQ is not active. When the partner becomes
  	 * ready, we will do the passive init reset.
  	 */
  
  	if (!rc)
  		init_success = true;
  
  	rc = init_stats_buffers(adapter);
  	if (rc)
  		goto ibmvnic_init_fail;
  
  	rc = init_stats_token(adapter);
  	if (rc)
  		goto ibmvnic_stats_fail;
  
  	rc = device_create_file(&dev->dev, &dev_attr_failover);
  	if (rc)
  		goto ibmvnic_dev_file_err;
  
  	netif_carrier_off(netdev);
  	rc = register_netdev(netdev);
  	if (rc) {
  		dev_err(&dev->dev, "failed to register netdev rc=%d\n", rc);
  		goto ibmvnic_register_fail;
  	}
  	dev_info(&dev->dev, "ibmvnic registered\n");
  
  	if (init_success) {
  		adapter->state = VNIC_PROBED;
  		netdev->mtu = adapter->req_mtu - ETH_HLEN;
  		netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
  		netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
  	} else {
  		adapter->state = VNIC_DOWN;
  	}
  
  	adapter->wait_for_reset = false;
  	adapter->last_reset_time = jiffies;
  	return 0;
  
  ibmvnic_register_fail:
  	device_remove_file(&dev->dev, &dev_attr_failover);
  
  ibmvnic_dev_file_err:
  	release_stats_token(adapter);
  
  ibmvnic_stats_fail:
  	release_stats_buffers(adapter);
  
  ibmvnic_init_fail:
  	release_sub_crqs(adapter, 1);
  	release_crq_queue(adapter);
  	mutex_destroy(&adapter->fw_lock);
  	free_netdev(netdev);
  
  	return rc;
  }
  
  static void ibmvnic_remove(struct vio_dev *dev)
  {
  	struct net_device *netdev = dev_get_drvdata(&dev->dev);
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	unsigned long flags;
  
  	spin_lock_irqsave(&adapter->state_lock, flags);
  
  	/* If ibmvnic_reset() is scheduling a reset, wait for it to
  	 * finish. Then, set the state to REMOVING to prevent it from
  	 * scheduling any more work and to have reset functions ignore
  	 * any resets that have already been scheduled. Drop the lock
  	 * after setting state, so __ibmvnic_reset() which is called
  	 * from the flush_work() below, can make progress.
  	 */
  	spin_lock(&adapter->rwi_lock);
  	adapter->state = VNIC_REMOVING;
  	spin_unlock(&adapter->rwi_lock);
  
  	spin_unlock_irqrestore(&adapter->state_lock, flags);
  
  	flush_work(&adapter->ibmvnic_reset);
  	flush_delayed_work(&adapter->ibmvnic_delayed_reset);
  
  	rtnl_lock();
  	unregister_netdevice(netdev);
  
  	release_resources(adapter);
  	release_sub_crqs(adapter, 1);
  	release_crq_queue(adapter);
  
  	release_stats_token(adapter);
  	release_stats_buffers(adapter);
  
  	adapter->state = VNIC_REMOVED;
  
  	rtnl_unlock();
  	mutex_destroy(&adapter->fw_lock);
  	device_remove_file(&dev->dev, &dev_attr_failover);
  	free_netdev(netdev);
  	dev_set_drvdata(&dev->dev, NULL);
  }
  
  static ssize_t failover_store(struct device *dev, struct device_attribute *attr,
  			      const char *buf, size_t count)
  {
  	struct net_device *netdev = dev_get_drvdata(dev);
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
  	__be64 session_token;
  	long rc;
  
  	if (!sysfs_streq(buf, "1"))
  		return -EINVAL;
  
  	rc = plpar_hcall(H_VIOCTL, retbuf, adapter->vdev->unit_address,
  			 H_GET_SESSION_TOKEN, 0, 0, 0);
  	if (rc) {
  		netdev_err(netdev, "Couldn't retrieve session token, rc %ld\n",
  			   rc);
  		goto last_resort;
  	}
  
  	session_token = (__be64)retbuf[0];
  	netdev_dbg(netdev, "Initiating client failover, session id %llx\n",
  		   be64_to_cpu(session_token));
  	rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
  				H_SESSION_ERR_DETECTED, session_token, 0, 0);
  	if (rc)
  		netdev_err(netdev,
  			   "H_VIOCTL initiated failover failed, rc %ld\n",
  			   rc);
  
  last_resort:
  	netdev_dbg(netdev, "Trying to send CRQ_CMD, the last resort\n");
  	ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
  
  	return count;
  }
  static DEVICE_ATTR_WO(failover);
  
  static unsigned long ibmvnic_get_desired_dma(struct vio_dev *vdev)
  {
  	struct net_device *netdev = dev_get_drvdata(&vdev->dev);
  	struct ibmvnic_adapter *adapter;
  	struct iommu_table *tbl;
  	unsigned long ret = 0;
  	int i;
  
  	tbl = get_iommu_table_base(&vdev->dev);
  
  	/* netdev inits at probe time along with the structures we need below*/
  	if (!netdev)
  		return IOMMU_PAGE_ALIGN(IBMVNIC_IO_ENTITLEMENT_DEFAULT, tbl);
  
  	adapter = netdev_priv(netdev);
  
  	ret += PAGE_SIZE; /* the crq message queue */
  	ret += IOMMU_PAGE_ALIGN(sizeof(struct ibmvnic_statistics), tbl);
  
  	for (i = 0; i < adapter->req_tx_queues + adapter->req_rx_queues; i++)
  		ret += 4 * PAGE_SIZE; /* the scrq message queue */
  
  	for (i = 0; i < adapter->num_active_rx_pools; i++)
  		ret += adapter->rx_pool[i].size *
  		    IOMMU_PAGE_ALIGN(adapter->rx_pool[i].buff_size, tbl);
  
  	return ret;
  }
  
  static int ibmvnic_resume(struct device *dev)
  {
  	struct net_device *netdev = dev_get_drvdata(dev);
  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
  
  	if (adapter->state != VNIC_OPEN)
  		return 0;
  
  	tasklet_schedule(&adapter->tasklet);
  
  	return 0;
  }
  
  static const struct vio_device_id ibmvnic_device_table[] = {
  	{"network", "IBM,vnic"},
  	{"", "" }
  };
  MODULE_DEVICE_TABLE(vio, ibmvnic_device_table);
  
  static const struct dev_pm_ops ibmvnic_pm_ops = {
  	.resume = ibmvnic_resume
  };
  
  static struct vio_driver ibmvnic_driver = {
  	.id_table       = ibmvnic_device_table,
  	.probe          = ibmvnic_probe,
  	.remove         = ibmvnic_remove,
  	.get_desired_dma = ibmvnic_get_desired_dma,
  	.name		= ibmvnic_driver_name,
  	.pm		= &ibmvnic_pm_ops,
  };
  
  /* module functions */
  static int __init ibmvnic_module_init(void)
  {
  	pr_info("%s: %s %s\n", ibmvnic_driver_name, ibmvnic_driver_string,
  		IBMVNIC_DRIVER_VERSION);
  
  	return vio_register_driver(&ibmvnic_driver);
  }
  
  static void __exit ibmvnic_module_exit(void)
  {
  	vio_unregister_driver(&ibmvnic_driver);
  }
  
  module_init(ibmvnic_module_init);
  module_exit(ibmvnic_module_exit);
  