text: /*
   *  FUJITSU Extended Socket Network Device driver
   *  Copyright (c) 2015 FUJITSU LIMITED
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms and conditions of the GNU General Public License,
   * version 2, as published by the Free Software Foundation.
   *
   * This program is distributed in the hope it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, see <http://www.gnu.org/licenses/>.
   *
   * The full GNU General Public License is included in this distribution in
   * the file called "COPYING".
   *
   */
  
  #include <linux/module.h>
  #include <linux/types.h>
  #include <linux/nls.h>
  #include <linux/platform_device.h>
  #include <linux/netdevice.h>
  #include <linux/interrupt.h>
  
  #include "fjes.h"
  #include "fjes_trace.h"
  
  #define MAJ 1
  #define MIN 2
  #define DRV_VERSION __stringify(MAJ) "." __stringify(MIN)
  #define DRV_NAME	"fjes"
  char fjes_driver_name[] = DRV_NAME;
  char fjes_driver_version[] = DRV_VERSION;
  static const char fjes_driver_string[] =
  		"FUJITSU Extended Socket Network Device Driver";
  static const char fjes_copyright[] =
  		"Copyright (c) 2015 FUJITSU LIMITED";
  
  MODULE_AUTHOR("Taku Izumi <izumi.taku@jp.fujitsu.com>");
  MODULE_DESCRIPTION("FUJITSU Extended Socket Network Device Driver");
  MODULE_LICENSE("GPL");
  MODULE_VERSION(DRV_VERSION);
  
  static int fjes_request_irq(struct fjes_adapter *);
  static void fjes_free_irq(struct fjes_adapter *);
  
  static int fjes_open(struct net_device *);
  static int fjes_close(struct net_device *);
  static int fjes_setup_resources(struct fjes_adapter *);
  static void fjes_free_resources(struct fjes_adapter *);
  static netdev_tx_t fjes_xmit_frame(struct sk_buff *, struct net_device *);
  static void fjes_raise_intr_rxdata_task(struct work_struct *);
  static void fjes_tx_stall_task(struct work_struct *);
  static void fjes_force_close_task(struct work_struct *);
  static irqreturn_t fjes_intr(int, void*);
  static void fjes_get_stats64(struct net_device *, struct rtnl_link_stats64 *);
  static int fjes_change_mtu(struct net_device *, int);
  static int fjes_vlan_rx_add_vid(struct net_device *, __be16 proto, u16);
  static int fjes_vlan_rx_kill_vid(struct net_device *, __be16 proto, u16);
  static void fjes_tx_retry(struct net_device *);
  
  static int fjes_acpi_add(struct acpi_device *);
  static int fjes_acpi_remove(struct acpi_device *);
  static acpi_status fjes_get_acpi_resource(struct acpi_resource *, void*);
  
  static int fjes_probe(struct platform_device *);
  static int fjes_remove(struct platform_device *);
  
  static int fjes_sw_init(struct fjes_adapter *);
  static void fjes_netdev_setup(struct net_device *);
  static void fjes_irq_watch_task(struct work_struct *);
  static void fjes_watch_unshare_task(struct work_struct *);
  static void fjes_rx_irq(struct fjes_adapter *, int);
  static int fjes_poll(struct napi_struct *, int);
  
  static const struct acpi_device_id fjes_acpi_ids[] = {
  	{"PNP0C02", 0},
  	{"", 0},
  };
  MODULE_DEVICE_TABLE(acpi, fjes_acpi_ids);
  
  static struct acpi_driver fjes_acpi_driver = {
  	.name = DRV_NAME,
  	.class = DRV_NAME,
  	.owner = THIS_MODULE,
  	.ids = fjes_acpi_ids,
  	.ops = {
  		.add = fjes_acpi_add,
  		.remove = fjes_acpi_remove,
  	},
  };
  
  static struct platform_driver fjes_driver = {
  	.driver = {
  		.name = DRV_NAME,
  	},
  	.probe = fjes_probe,
  	.remove = fjes_remove,
  };
  
  static struct resource fjes_resource[] = {
  	{
  		.flags = IORESOURCE_MEM,
  		.start = 0,
  		.end = 0,
  	},
  	{
  		.flags = IORESOURCE_IRQ,
  		.start = 0,
  		.end = 0,
  	},
  };
  
  static int fjes_acpi_add(struct acpi_device *device)
  {
  	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
  	char str_buf[sizeof(FJES_ACPI_SYMBOL) + 1];
  	struct platform_device *plat_dev;
  	union acpi_object *str;
  	acpi_status status;
  	int result;
  
  	status = acpi_evaluate_object(device->handle, "_STR", NULL, &buffer);
  	if (ACPI_FAILURE(status))
  		return -ENODEV;
  
  	str = buffer.pointer;
  	result = utf16s_to_utf8s((wchar_t *)str->string.pointer,
  				 str->string.length, UTF16_LITTLE_ENDIAN,
  				 str_buf, sizeof(str_buf) - 1);
  	str_buf[result] = 0;
  
  	if (strncmp(FJES_ACPI_SYMBOL, str_buf, strlen(FJES_ACPI_SYMBOL)) != 0) {
  		kfree(buffer.pointer);
  		return -ENODEV;
  	}
  	kfree(buffer.pointer);
  
  	status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
  				     fjes_get_acpi_resource, fjes_resource);
  	if (ACPI_FAILURE(status))
  		return -ENODEV;
  
  	/* create platform_device */
  	plat_dev = platform_device_register_simple(DRV_NAME, 0, fjes_resource,
  						   ARRAY_SIZE(fjes_resource));
  	device->driver_data = plat_dev;
  
  	return 0;
  }
  
  static int fjes_acpi_remove(struct acpi_device *device)
  {
  	struct platform_device *plat_dev;
  
  	plat_dev = (struct platform_device *)acpi_driver_data(device);
  	platform_device_unregister(plat_dev);
  
  	return 0;
  }
  
  static acpi_status
  fjes_get_acpi_resource(struct acpi_resource *acpi_res, void *data)
  {
  	struct acpi_resource_address32 *addr;
  	struct acpi_resource_irq *irq;
  	struct resource *res = data;
  
  	switch (acpi_res->type) {
  	case ACPI_RESOURCE_TYPE_ADDRESS32:
  		addr = &acpi_res->data.address32;
  		res[0].start = addr->address.minimum;
  		res[0].end = addr->address.minimum +
  			addr->address.address_length - 1;
  		break;
  
  	case ACPI_RESOURCE_TYPE_IRQ:
  		irq = &acpi_res->data.irq;
  		if (irq->interrupt_count != 1)
  			return AE_ERROR;
  		res[1].start = irq->interrupts[0];
  		res[1].end = irq->interrupts[0];
  		break;
  
  	default:
  		break;
  	}
  
  	return AE_OK;
  }
  
  static int fjes_request_irq(struct fjes_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	int result = -1;
  
  	adapter->interrupt_watch_enable = true;
  	if (!delayed_work_pending(&adapter->interrupt_watch_task)) {
  		queue_delayed_work(adapter->control_wq,
  				   &adapter->interrupt_watch_task,
  				   FJES_IRQ_WATCH_DELAY);
  	}
  
  	if (!adapter->irq_registered) {
  		result = request_irq(adapter->hw.hw_res.irq, fjes_intr,
  				     IRQF_SHARED, netdev->name, adapter);
  		if (result)
  			adapter->irq_registered = false;
  		else
  			adapter->irq_registered = true;
  	}
  
  	return result;
  }
  
  static void fjes_free_irq(struct fjes_adapter *adapter)
  {
  	struct fjes_hw *hw = &adapter->hw;
  
  	adapter->interrupt_watch_enable = false;
  	cancel_delayed_work_sync(&adapter->interrupt_watch_task);
  
  	fjes_hw_set_irqmask(hw, REG_ICTL_MASK_ALL, true);
  
  	if (adapter->irq_registered) {
  		free_irq(adapter->hw.hw_res.irq, adapter);
  		adapter->irq_registered = false;
  	}
  }
  
  static const struct net_device_ops fjes_netdev_ops = {
  	.ndo_open		= fjes_open,
  	.ndo_stop		= fjes_close,
  	.ndo_start_xmit		= fjes_xmit_frame,
  	.ndo_get_stats64	= fjes_get_stats64,
  	.ndo_change_mtu		= fjes_change_mtu,
  	.ndo_tx_timeout		= fjes_tx_retry,
  	.ndo_vlan_rx_add_vid	= fjes_vlan_rx_add_vid,
  	.ndo_vlan_rx_kill_vid = fjes_vlan_rx_kill_vid,
  };
  
  /* fjes_open - Called when a network interface is made active */
  static int fjes_open(struct net_device *netdev)
  {
  	struct fjes_adapter *adapter = netdev_priv(netdev);
  	struct fjes_hw *hw = &adapter->hw;
  	int result;
  
  	if (adapter->open_guard)
  		return -ENXIO;
  
  	result = fjes_setup_resources(adapter);
  	if (result)
  		goto err_setup_res;
  
  	hw->txrx_stop_req_bit = 0;
  	hw->epstop_req_bit = 0;
  
  	napi_enable(&adapter->napi);
  
  	fjes_hw_capture_interrupt_status(hw);
  
  	result = fjes_request_irq(adapter);
  	if (result)
  		goto err_req_irq;
  
  	fjes_hw_set_irqmask(hw, REG_ICTL_MASK_ALL, false);
  
  	netif_tx_start_all_queues(netdev);
  	netif_carrier_on(netdev);
  
  	return 0;
  
  err_req_irq:
  	fjes_free_irq(adapter);
  	napi_disable(&adapter->napi);
  
  err_setup_res:
  	fjes_free_resources(adapter);
  	return result;
  }
  
  /* fjes_close - Disables a network interface */
  static int fjes_close(struct net_device *netdev)
  {
  	struct fjes_adapter *adapter = netdev_priv(netdev);
  	struct fjes_hw *hw = &adapter->hw;
  	unsigned long flags;
  	int epidx;
  
  	netif_tx_stop_all_queues(netdev);
  	netif_carrier_off(netdev);
  
  	fjes_hw_raise_epstop(hw);
  
  	napi_disable(&adapter->napi);
  
  	spin_lock_irqsave(&hw->rx_status_lock, flags);
  	for (epidx = 0; epidx < hw->max_epid; epidx++) {
  		if (epidx == hw->my_epid)
  			continue;
  
  		if (fjes_hw_get_partner_ep_status(hw, epidx) ==
  		    EP_PARTNER_SHARED)
  			adapter->hw.ep_shm_info[epidx]
  				   .tx.info->v1i.rx_status &=
  				~FJES_RX_POLL_WORK;
  	}
  	spin_unlock_irqrestore(&hw->rx_status_lock, flags);
  
  	fjes_free_irq(adapter);
  
  	cancel_delayed_work_sync(&adapter->interrupt_watch_task);
  	cancel_work_sync(&adapter->unshare_watch_task);
  	adapter->unshare_watch_bitmask = 0;
  	cancel_work_sync(&adapter->raise_intr_rxdata_task);
  	cancel_work_sync(&adapter->tx_stall_task);
  
  	cancel_work_sync(&hw->update_zone_task);
  	cancel_work_sync(&hw->epstop_task);
  
  	fjes_hw_wait_epstop(hw);
  
  	fjes_free_resources(adapter);
  
  	return 0;
  }
  
  static int fjes_setup_resources(struct fjes_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	struct ep_share_mem_info *buf_pair;
  	struct fjes_hw *hw = &adapter->hw;
  	unsigned long flags;
  	int result;
  	int epidx;
  
  	mutex_lock(&hw->hw_info.lock);
  	result = fjes_hw_request_info(hw);
  	switch (result) {
  	case 0:
  		for (epidx = 0; epidx < hw->max_epid; epidx++) {
  			hw->ep_shm_info[epidx].es_status =
  			    hw->hw_info.res_buf->info.info[epidx].es_status;
  			hw->ep_shm_info[epidx].zone =
  			    hw->hw_info.res_buf->info.info[epidx].zone;
  		}
  		break;
  	default:
  	case -ENOMSG:
  	case -EBUSY:
  		adapter->force_reset = true;
  
  		mutex_unlock(&hw->hw_info.lock);
  		return result;
  	}
  	mutex_unlock(&hw->hw_info.lock);
  
  	for (epidx = 0; epidx < (hw->max_epid); epidx++) {
  		if ((epidx != hw->my_epid) &&
  		    (hw->ep_shm_info[epidx].es_status ==
  		     FJES_ZONING_STATUS_ENABLE)) {
  			fjes_hw_raise_interrupt(hw, epidx,
  						REG_ICTL_MASK_INFO_UPDATE);
  			hw->ep_shm_info[epidx].ep_stats
  				.send_intr_zoneupdate += 1;
  		}
  	}
  
  	msleep(FJES_OPEN_ZONE_UPDATE_WAIT * hw->max_epid);
  
  	for (epidx = 0; epidx < (hw->max_epid); epidx++) {
  		if (epidx == hw->my_epid)
  			continue;
  
  		buf_pair = &hw->ep_shm_info[epidx];
  
  		spin_lock_irqsave(&hw->rx_status_lock, flags);
  		fjes_hw_setup_epbuf(&buf_pair->tx, netdev->dev_addr,
  				    netdev->mtu);
  		spin_unlock_irqrestore(&hw->rx_status_lock, flags);
  
  		if (fjes_hw_epid_is_same_zone(hw, epidx)) {
  			mutex_lock(&hw->hw_info.lock);
  			result =
  			fjes_hw_register_buff_addr(hw, epidx, buf_pair);
  			mutex_unlock(&hw->hw_info.lock);
  
  			switch (result) {
  			case 0:
  				break;
  			case -ENOMSG:
  			case -EBUSY:
  			default:
  				adapter->force_reset = true;
  				return result;
  			}
  
  			hw->ep_shm_info[epidx].ep_stats
  				.com_regist_buf_exec += 1;
  		}
  	}
  
  	return 0;
  }
  
  static void fjes_free_resources(struct fjes_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	struct fjes_device_command_param param;
  	struct ep_share_mem_info *buf_pair;
  	struct fjes_hw *hw = &adapter->hw;
  	bool reset_flag = false;
  	unsigned long flags;
  	int result;
  	int epidx;
  
  	for (epidx = 0; epidx < hw->max_epid; epidx++) {
  		if (epidx == hw->my_epid)
  			continue;
  
  		mutex_lock(&hw->hw_info.lock);
  		result = fjes_hw_unregister_buff_addr(hw, epidx);
  		mutex_unlock(&hw->hw_info.lock);
  
  		hw->ep_shm_info[epidx].ep_stats.com_unregist_buf_exec += 1;
  
  		if (result)
  			reset_flag = true;
  
  		buf_pair = &hw->ep_shm_info[epidx];
  
  		spin_lock_irqsave(&hw->rx_status_lock, flags);
  		fjes_hw_setup_epbuf(&buf_pair->tx,
  				    netdev->dev_addr, netdev->mtu);
  		spin_unlock_irqrestore(&hw->rx_status_lock, flags);
  
  		clear_bit(epidx, &hw->txrx_stop_req_bit);
  	}
  
  	if (reset_flag || adapter->force_reset) {
  		result = fjes_hw_reset(hw);
  
  		adapter->force_reset = false;
  
  		if (result)
  			adapter->open_guard = true;
  
  		hw->hw_info.buffer_share_bit = 0;
  
  		memset((void *)&param, 0, sizeof(param));
  
  		param.req_len = hw->hw_info.req_buf_size;
  		param.req_start = __pa(hw->hw_info.req_buf);
  		param.res_len = hw->hw_info.res_buf_size;
  		param.res_start = __pa(hw->hw_info.res_buf);
  		param.share_start = __pa(hw->hw_info.share->ep_status);
  
  		fjes_hw_init_command_registers(hw, &param);
  	}
  }
  
  static void fjes_tx_stall_task(struct work_struct *work)
  {
  	struct fjes_adapter *adapter = container_of(work,
  			struct fjes_adapter, tx_stall_task);
  	struct net_device *netdev = adapter->netdev;
  	struct fjes_hw *hw = &adapter->hw;
  	int all_queue_available, sendable;
  	enum ep_partner_status pstatus;
  	int max_epid, my_epid, epid;
  	union ep_buffer_info *info;
  	int i;
  
  	if (((long)jiffies -
  		dev_trans_start(netdev)) > FJES_TX_TX_STALL_TIMEOUT) {
  		netif_wake_queue(netdev);
  		return;
  	}
  
  	my_epid = hw->my_epid;
  	max_epid = hw->max_epid;
  
  	for (i = 0; i < 5; i++) {
  		all_queue_available = 1;
  
  		for (epid = 0; epid < max_epid; epid++) {
  			if (my_epid == epid)
  				continue;
  
  			pstatus = fjes_hw_get_partner_ep_status(hw, epid);
  			sendable = (pstatus == EP_PARTNER_SHARED);
  			if (!sendable)
  				continue;
  
  			info = adapter->hw.ep_shm_info[epid].tx.info;
  
  			if (!(info->v1i.rx_status & FJES_RX_MTU_CHANGING_DONE))
  				return;
  
  			if (EP_RING_FULL(info->v1i.head, info->v1i.tail,
  					 info->v1i.count_max)) {
  				all_queue_available = 0;
  				break;
  			}
  		}
  
  		if (all_queue_available) {
  			netif_wake_queue(netdev);
  			return;
  		}
  	}
  
  	usleep_range(50, 100);
  
  	queue_work(adapter->txrx_wq, &adapter->tx_stall_task);
  }
  
  static void fjes_force_close_task(struct work_struct *work)
  {
  	struct fjes_adapter *adapter = container_of(work,
  			struct fjes_adapter, force_close_task);
  	struct net_device *netdev = adapter->netdev;
  
  	rtnl_lock();
  	dev_close(netdev);
  	rtnl_unlock();
  }
  
  static void fjes_raise_intr_rxdata_task(struct work_struct *work)
  {
  	struct fjes_adapter *adapter = container_of(work,
  			struct fjes_adapter, raise_intr_rxdata_task);
  	struct fjes_hw *hw = &adapter->hw;
  	enum ep_partner_status pstatus;
  	int max_epid, my_epid, epid;
  
  	my_epid = hw->my_epid;
  	max_epid = hw->max_epid;
  
  	for (epid = 0; epid < max_epid; epid++)
  		hw->ep_shm_info[epid].tx_status_work = 0;
  
  	for (epid = 0; epid < max_epid; epid++) {
  		if (epid == my_epid)
  			continue;
  
  		pstatus = fjes_hw_get_partner_ep_status(hw, epid);
  		if (pstatus == EP_PARTNER_SHARED) {
  			hw->ep_shm_info[epid].tx_status_work =
  				hw->ep_shm_info[epid].tx.info->v1i.tx_status;
  
  			if (hw->ep_shm_info[epid].tx_status_work ==
  				FJES_TX_DELAY_SEND_PENDING) {
  				hw->ep_shm_info[epid].tx.info->v1i.tx_status =
  					FJES_TX_DELAY_SEND_NONE;
  			}
  		}
  	}
  
  	for (epid = 0; epid < max_epid; epid++) {
  		if (epid == my_epid)
  			continue;
  
  		pstatus = fjes_hw_get_partner_ep_status(hw, epid);
  		if ((hw->ep_shm_info[epid].tx_status_work ==
  		     FJES_TX_DELAY_SEND_PENDING) &&
  		    (pstatus == EP_PARTNER_SHARED) &&
  		    !(hw->ep_shm_info[epid].rx.info->v1i.rx_status &
  		      FJES_RX_POLL_WORK)) {
  			fjes_hw_raise_interrupt(hw, epid,
  						REG_ICTL_MASK_RX_DATA);
  			hw->ep_shm_info[epid].ep_stats.send_intr_rx += 1;
  		}
  	}
  
  	usleep_range(500, 1000);
  }
  
  static int fjes_tx_send(struct fjes_adapter *adapter, int dest,
  			void *data, size_t len)
  {
  	int retval;
  
  	retval = fjes_hw_epbuf_tx_pkt_send(&adapter->hw.ep_shm_info[dest].tx,
  					   data, len);
  	if (retval)
  		return retval;
  
  	adapter->hw.ep_shm_info[dest].tx.info->v1i.tx_status =
  		FJES_TX_DELAY_SEND_PENDING;
  	if (!work_pending(&adapter->raise_intr_rxdata_task))
  		queue_work(adapter->txrx_wq,
  			   &adapter->raise_intr_rxdata_task);
  
  	retval = 0;
  	return retval;
  }
  
  static netdev_tx_t
  fjes_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
  {
  	struct fjes_adapter *adapter = netdev_priv(netdev);
  	struct fjes_hw *hw = &adapter->hw;
  
  	int max_epid, my_epid, dest_epid;
  	enum ep_partner_status pstatus;
  	struct netdev_queue *cur_queue;
  	char shortpkt[VLAN_ETH_HLEN];
  	bool is_multi, vlan;
  	struct ethhdr *eth;
  	u16 queue_no = 0;
  	u16 vlan_id = 0;
  	netdev_tx_t ret;
  	char *data;
  	int len;
  
  	ret = NETDEV_TX_OK;
  	is_multi = false;
  	cur_queue = netdev_get_tx_queue(netdev, queue_no);
  
  	eth = (struct ethhdr *)skb->data;
  	my_epid = hw->my_epid;
  
  	vlan = (vlan_get_tag(skb, &vlan_id) == 0) ? true : false;
  
  	data = skb->data;
  	len = skb->len;
  
  	if (is_multicast_ether_addr(eth->h_dest)) {
  		dest_epid = 0;
  		max_epid = hw->max_epid;
  		is_multi = true;
  	} else if (is_local_ether_addr(eth->h_dest)) {
  		dest_epid = eth->h_dest[ETH_ALEN - 1];
  		max_epid = dest_epid + 1;
  
  		if ((eth->h_dest[0] == 0x02) &&
  		    (0x00 == (eth->h_dest[1] | eth->h_dest[2] |
  			      eth->h_dest[3] | eth->h_dest[4])) &&
  		    (dest_epid < hw->max_epid)) {
  			;
  		} else {
  			dest_epid = 0;
  			max_epid = 0;
  			ret = NETDEV_TX_OK;
  
  			adapter->stats64.tx_packets += 1;
  			hw->ep_shm_info[my_epid].net_stats.tx_packets += 1;
  			adapter->stats64.tx_bytes += len;
  			hw->ep_shm_info[my_epid].net_stats.tx_bytes += len;
  		}
  	} else {
  		dest_epid = 0;
  		max_epid = 0;
  		ret = NETDEV_TX_OK;
  
  		adapter->stats64.tx_packets += 1;
  		hw->ep_shm_info[my_epid].net_stats.tx_packets += 1;
  		adapter->stats64.tx_bytes += len;
  		hw->ep_shm_info[my_epid].net_stats.tx_bytes += len;
  	}
  
  	for (; dest_epid < max_epid; dest_epid++) {
  		if (my_epid == dest_epid)
  			continue;
  
  		pstatus = fjes_hw_get_partner_ep_status(hw, dest_epid);
  		if (pstatus != EP_PARTNER_SHARED) {
  			if (!is_multi)
  				hw->ep_shm_info[dest_epid].ep_stats
  					.tx_dropped_not_shared += 1;
  			ret = NETDEV_TX_OK;
  		} else if (!fjes_hw_check_epbuf_version(
  				&adapter->hw.ep_shm_info[dest_epid].rx, 0)) {
  			/* version is NOT 0 */
  			adapter->stats64.tx_carrier_errors += 1;
  			hw->ep_shm_info[dest_epid].net_stats
  						.tx_carrier_errors += 1;
  			hw->ep_shm_info[dest_epid].ep_stats
  					.tx_dropped_ver_mismatch += 1;
  
  			ret = NETDEV_TX_OK;
  		} else if (!fjes_hw_check_mtu(
  				&adapter->hw.ep_shm_info[dest_epid].rx,
  				netdev->mtu)) {
  			adapter->stats64.tx_dropped += 1;
  			hw->ep_shm_info[dest_epid].net_stats.tx_dropped += 1;
  			adapter->stats64.tx_errors += 1;
  			hw->ep_shm_info[dest_epid].net_stats.tx_errors += 1;
  			hw->ep_shm_info[dest_epid].ep_stats
  					.tx_dropped_buf_size_mismatch += 1;
  
  			ret = NETDEV_TX_OK;
  		} else if (vlan &&
  			   !fjes_hw_check_vlan_id(
  				&adapter->hw.ep_shm_info[dest_epid].rx,
  				vlan_id)) {
  			hw->ep_shm_info[dest_epid].ep_stats
  				.tx_dropped_vlanid_mismatch += 1;
  			ret = NETDEV_TX_OK;
  		} else {
  			if (len < VLAN_ETH_HLEN) {
  				memset(shortpkt, 0, VLAN_ETH_HLEN);
  				memcpy(shortpkt, skb->data, skb->len);
  				len = VLAN_ETH_HLEN;
  				data = shortpkt;
  			}
  
  			if (adapter->tx_retry_count == 0) {
  				adapter->tx_start_jiffies = jiffies;
  				adapter->tx_retry_count = 1;
  			} else {
  				adapter->tx_retry_count++;
  			}
  
  			if (fjes_tx_send(adapter, dest_epid, data, len)) {
  				if (is_multi) {
  					ret = NETDEV_TX_OK;
  				} else if (
  					   ((long)jiffies -
  					    (long)adapter->tx_start_jiffies) >=
  					    FJES_TX_RETRY_TIMEOUT) {
  					adapter->stats64.tx_fifo_errors += 1;
  					hw->ep_shm_info[dest_epid].net_stats
  								.tx_fifo_errors += 1;
  					adapter->stats64.tx_errors += 1;
  					hw->ep_shm_info[dest_epid].net_stats
  								.tx_errors += 1;
  
  					ret = NETDEV_TX_OK;
  				} else {
  					netif_trans_update(netdev);
  					hw->ep_shm_info[dest_epid].ep_stats
  						.tx_buffer_full += 1;
  					netif_tx_stop_queue(cur_queue);
  
  					if (!work_pending(&adapter->tx_stall_task))
  						queue_work(adapter->txrx_wq,
  							   &adapter->tx_stall_task);
  
  					ret = NETDEV_TX_BUSY;
  				}
  			} else {
  				if (!is_multi) {
  					adapter->stats64.tx_packets += 1;
  					hw->ep_shm_info[dest_epid].net_stats
  								.tx_packets += 1;
  					adapter->stats64.tx_bytes += len;
  					hw->ep_shm_info[dest_epid].net_stats
  								.tx_bytes += len;
  				}
  
  				adapter->tx_retry_count = 0;
  				ret = NETDEV_TX_OK;
  			}
  		}
  	}
  
  	if (ret == NETDEV_TX_OK) {
  		dev_kfree_skb(skb);
  		if (is_multi) {
  			adapter->stats64.tx_packets += 1;
  			hw->ep_shm_info[my_epid].net_stats.tx_packets += 1;
  			adapter->stats64.tx_bytes += 1;
  			hw->ep_shm_info[my_epid].net_stats.tx_bytes += len;
  		}
  	}
  
  	return ret;
  }
  
  static void fjes_tx_retry(struct net_device *netdev)
  {
  	struct netdev_queue *queue = netdev_get_tx_queue(netdev, 0);
  
  	netif_tx_wake_queue(queue);
  }
  
  static void
  fjes_get_stats64(struct net_device *netdev, struct rtnl_link_stats64 *stats)
  {
  	struct fjes_adapter *adapter = netdev_priv(netdev);
  
  	memcpy(stats, &adapter->stats64, sizeof(struct rtnl_link_stats64));
  }
  
  static int fjes_change_mtu(struct net_device *netdev, int new_mtu)
  {
  	struct fjes_adapter *adapter = netdev_priv(netdev);
  	bool running = netif_running(netdev);
  	struct fjes_hw *hw = &adapter->hw;
  	unsigned long flags;
  	int ret = -EINVAL;
  	int idx, epidx;
  
  	for (idx = 0; fjes_support_mtu[idx] != 0; idx++) {
  		if (new_mtu <= fjes_support_mtu[idx]) {
  			new_mtu = fjes_support_mtu[idx];
  			if (new_mtu == netdev->mtu)
  				return 0;
  
  			ret = 0;
  			break;
  		}
  	}
  
  	if (ret)
  		return ret;
  
  	if (running) {
  		spin_lock_irqsave(&hw->rx_status_lock, flags);
  		for (epidx = 0; epidx < hw->max_epid; epidx++) {
  			if (epidx == hw->my_epid)
  				continue;
  			hw->ep_shm_info[epidx].tx.info->v1i.rx_status &=
  				~FJES_RX_MTU_CHANGING_DONE;
  		}
  		spin_unlock_irqrestore(&hw->rx_status_lock, flags);
  
  		netif_tx_stop_all_queues(netdev);
  		netif_carrier_off(netdev);
  		cancel_work_sync(&adapter->tx_stall_task);
  		napi_disable(&adapter->napi);
  
  		msleep(1000);
  
  		netif_tx_stop_all_queues(netdev);
  	}
  
  	netdev->mtu = new_mtu;
  
  	if (running) {
  		for (epidx = 0; epidx < hw->max_epid; epidx++) {
  			if (epidx == hw->my_epid)
  				continue;
  
  			spin_lock_irqsave(&hw->rx_status_lock, flags);
  			fjes_hw_setup_epbuf(&hw->ep_shm_info[epidx].tx,
  					    netdev->dev_addr,
  					    netdev->mtu);
  
  			hw->ep_shm_info[epidx].tx.info->v1i.rx_status |=
  				FJES_RX_MTU_CHANGING_DONE;
  			spin_unlock_irqrestore(&hw->rx_status_lock, flags);
  		}
  
  		netif_tx_wake_all_queues(netdev);
  		netif_carrier_on(netdev);
  		napi_enable(&adapter->napi);
  		napi_schedule(&adapter->napi);
  	}
  
  	return ret;
  }
  
  static int fjes_vlan_rx_add_vid(struct net_device *netdev,
  				__be16 proto, u16 vid)
  {
  	struct fjes_adapter *adapter = netdev_priv(netdev);
  	bool ret = true;
  	int epid;
  
  	for (epid = 0; epid < adapter->hw.max_epid; epid++) {
  		if (epid == adapter->hw.my_epid)
  			continue;
  
  		if (!fjes_hw_check_vlan_id(
  			&adapter->hw.ep_shm_info[epid].tx, vid))
  			ret = fjes_hw_set_vlan_id(
  				&adapter->hw.ep_shm_info[epid].tx, vid);
  	}
  
  	return ret ? 0 : -ENOSPC;
  }
  
  static int fjes_vlan_rx_kill_vid(struct net_device *netdev,
  				 __be16 proto, u16 vid)
  {
  	struct fjes_adapter *adapter = netdev_priv(netdev);
  	int epid;
  
  	for (epid = 0; epid < adapter->hw.max_epid; epid++) {
  		if (epid == adapter->hw.my_epid)
  			continue;
  
  		fjes_hw_del_vlan_id(&adapter->hw.ep_shm_info[epid].tx, vid);
  	}
  
  	return 0;
  }
  
  static void fjes_txrx_stop_req_irq(struct fjes_adapter *adapter,
  				   int src_epid)
  {
  	struct fjes_hw *hw = &adapter->hw;
  	enum ep_partner_status status;
  	unsigned long flags;
  
  	status = fjes_hw_get_partner_ep_status(hw, src_epid);
  	trace_fjes_txrx_stop_req_irq_pre(hw, src_epid, status);
  	switch (status) {
  	case EP_PARTNER_UNSHARE:
  	case EP_PARTNER_COMPLETE:
  	default:
  		break;
  	case EP_PARTNER_WAITING:
  		if (src_epid < hw->my_epid) {
  			spin_lock_irqsave(&hw->rx_status_lock, flags);
  			hw->ep_shm_info[src_epid].tx.info->v1i.rx_status |=
  				FJES_RX_STOP_REQ_DONE;
  			spin_unlock_irqrestore(&hw->rx_status_lock, flags);
  
  			clear_bit(src_epid, &hw->txrx_stop_req_bit);
  			set_bit(src_epid, &adapter->unshare_watch_bitmask);
  
  			if (!work_pending(&adapter->unshare_watch_task))
  				queue_work(adapter->control_wq,
  					   &adapter->unshare_watch_task);
  		}
  		break;
  	case EP_PARTNER_SHARED:
  		if (hw->ep_shm_info[src_epid].rx.info->v1i.rx_status &
  		    FJES_RX_STOP_REQ_REQUEST) {
  			set_bit(src_epid, &hw->epstop_req_bit);
  			if (!work_pending(&hw->epstop_task))
  				queue_work(adapter->control_wq,
  					   &hw->epstop_task);
  		}
  		break;
  	}
  	trace_fjes_txrx_stop_req_irq_post(hw, src_epid);
  }
  
  static void fjes_stop_req_irq(struct fjes_adapter *adapter, int src_epid)
  {
  	struct fjes_hw *hw = &adapter->hw;
  	enum ep_partner_status status;
  	unsigned long flags;
  
  	set_bit(src_epid, &hw->hw_info.buffer_unshare_reserve_bit);
  
  	status = fjes_hw_get_partner_ep_status(hw, src_epid);
  	trace_fjes_stop_req_irq_pre(hw, src_epid, status);
  	switch (status) {
  	case EP_PARTNER_WAITING:
  		spin_lock_irqsave(&hw->rx_status_lock, flags);
  		hw->ep_shm_info[src_epid].tx.info->v1i.rx_status |=
  				FJES_RX_STOP_REQ_DONE;
  		spin_unlock_irqrestore(&hw->rx_status_lock, flags);
  		clear_bit(src_epid, &hw->txrx_stop_req_bit);
  		/* fall through */
  	case EP_PARTNER_UNSHARE:
  	case EP_PARTNER_COMPLETE:
  	default:
  		set_bit(src_epid, &adapter->unshare_watch_bitmask);
  		if (!work_pending(&adapter->unshare_watch_task))
  			queue_work(adapter->control_wq,
  				   &adapter->unshare_watch_task);
  		break;
  	case EP_PARTNER_SHARED:
  		set_bit(src_epid, &hw->epstop_req_bit);
  
  		if (!work_pending(&hw->epstop_task))
  			queue_work(adapter->control_wq, &hw->epstop_task);
  		break;
  	}
  	trace_fjes_stop_req_irq_post(hw, src_epid);
  }
  
  static void fjes_update_zone_irq(struct fjes_adapter *adapter,
  				 int src_epid)
  {
  	struct fjes_hw *hw = &adapter->hw;
  
  	if (!work_pending(&hw->update_zone_task))
  		queue_work(adapter->control_wq, &hw->update_zone_task);
  }
  
  static irqreturn_t fjes_intr(int irq, void *data)
  {
  	struct fjes_adapter *adapter = data;
  	struct fjes_hw *hw = &adapter->hw;
  	irqreturn_t ret;
  	u32 icr;
  
  	icr = fjes_hw_capture_interrupt_status(hw);
  
  	if (icr & REG_IS_MASK_IS_ASSERT) {
  		if (icr & REG_ICTL_MASK_RX_DATA) {
  			fjes_rx_irq(adapter, icr & REG_IS_MASK_EPID);
  			hw->ep_shm_info[icr & REG_IS_MASK_EPID].ep_stats
  				.recv_intr_rx += 1;
  		}
  
  		if (icr & REG_ICTL_MASK_DEV_STOP_REQ) {
  			fjes_stop_req_irq(adapter, icr & REG_IS_MASK_EPID);
  			hw->ep_shm_info[icr & REG_IS_MASK_EPID].ep_stats
  				.recv_intr_stop += 1;
  		}
  
  		if (icr & REG_ICTL_MASK_TXRX_STOP_REQ) {
  			fjes_txrx_stop_req_irq(adapter, icr & REG_IS_MASK_EPID);
  			hw->ep_shm_info[icr & REG_IS_MASK_EPID].ep_stats
  				.recv_intr_unshare += 1;
  		}
  
  		if (icr & REG_ICTL_MASK_TXRX_STOP_DONE)
  			fjes_hw_set_irqmask(hw,
  					    REG_ICTL_MASK_TXRX_STOP_DONE, true);
  
  		if (icr & REG_ICTL_MASK_INFO_UPDATE) {
  			fjes_update_zone_irq(adapter, icr & REG_IS_MASK_EPID);
  			hw->ep_shm_info[icr & REG_IS_MASK_EPID].ep_stats
  				.recv_intr_zoneupdate += 1;
  		}
  
  		ret = IRQ_HANDLED;
  	} else {
  		ret = IRQ_NONE;
  	}
  
  	return ret;
  }
  
  static int fjes_rxframe_search_exist(struct fjes_adapter *adapter,
  				     int start_epid)
  {
  	struct fjes_hw *hw = &adapter->hw;
  	enum ep_partner_status pstatus;
  	int max_epid, cur_epid;
  	int i;
  
  	max_epid = hw->max_epid;
  	start_epid = (start_epid + 1 + max_epid) % max_epid;
  
  	for (i = 0; i < max_epid; i++) {
  		cur_epid = (start_epid + i) % max_epid;
  		if (cur_epid == hw->my_epid)
  			continue;
  
  		pstatus = fjes_hw_get_partner_ep_status(hw, cur_epid);
  		if (pstatus == EP_PARTNER_SHARED) {
  			if (!fjes_hw_epbuf_rx_is_empty(
  				&hw->ep_shm_info[cur_epid].rx))
  				return cur_epid;
  		}
  	}
  	return -1;
  }
  
  static void *fjes_rxframe_get(struct fjes_adapter *adapter, size_t *psize,
  			      int *cur_epid)
  {
  	void *frame;
  
  	*cur_epid = fjes_rxframe_search_exist(adapter, *cur_epid);
  	if (*cur_epid < 0)
  		return NULL;
  
  	frame =
  	fjes_hw_epbuf_rx_curpkt_get_addr(
  		&adapter->hw.ep_shm_info[*cur_epid].rx, psize);
  
  	return frame;
  }
  
  static void fjes_rxframe_release(struct fjes_adapter *adapter, int cur_epid)
  {
  	fjes_hw_epbuf_rx_curpkt_drop(&adapter->hw.ep_shm_info[cur_epid].rx);
  }
  
  static void fjes_rx_irq(struct fjes_adapter *adapter, int src_epid)
  {
  	struct fjes_hw *hw = &adapter->hw;
  
  	fjes_hw_set_irqmask(hw, REG_ICTL_MASK_RX_DATA, true);
  
  	adapter->unset_rx_last = true;
  	napi_schedule(&adapter->napi);
  }
  
  static int fjes_poll(struct napi_struct *napi, int budget)
  {
  	struct fjes_adapter *adapter =
  			container_of(napi, struct fjes_adapter, napi);
  	struct net_device *netdev = napi->dev;
  	struct fjes_hw *hw = &adapter->hw;
  	struct sk_buff *skb;
  	int work_done = 0;
  	int cur_epid = 0;
  	int epidx;
  	size_t frame_len;
  	void *frame;
  
  	spin_lock(&hw->rx_status_lock);
  	for (epidx = 0; epidx < hw->max_epid; epidx++) {
  		if (epidx == hw->my_epid)
  			continue;
  
  		if (fjes_hw_get_partner_ep_status(hw, epidx) ==
  		    EP_PARTNER_SHARED)
  			adapter->hw.ep_shm_info[epidx]
  				   .tx.info->v1i.rx_status |= FJES_RX_POLL_WORK;
  	}
  	spin_unlock(&hw->rx_status_lock);
  
  	while (work_done < budget) {
  		prefetch(&adapter->hw);
  		frame = fjes_rxframe_get(adapter, &frame_len, &cur_epid);
  
  		if (frame) {
  			skb = napi_alloc_skb(napi, frame_len);
  			if (!skb) {
  				adapter->stats64.rx_dropped += 1;
  				hw->ep_shm_info[cur_epid].net_stats
  							 .rx_dropped += 1;
  				adapter->stats64.rx_errors += 1;
  				hw->ep_shm_info[cur_epid].net_stats
  							 .rx_errors += 1;
  			} else {
  				memcpy(skb_put(skb, frame_len),
  				       frame, frame_len);
  				skb->protocol = eth_type_trans(skb, netdev);
  				skb->ip_summed = CHECKSUM_UNNECESSARY;
  
  				netif_receive_skb(skb);
  
  				work_done++;
  
  				adapter->stats64.rx_packets += 1;
  				hw->ep_shm_info[cur_epid].net_stats
  							 .rx_packets += 1;
  				adapter->stats64.rx_bytes += frame_len;
  				hw->ep_shm_info[cur_epid].net_stats
  							 .rx_bytes += frame_len;
  
  				if (is_multicast_ether_addr(
  					((struct ethhdr *)frame)->h_dest)) {
  					adapter->stats64.multicast += 1;
  					hw->ep_shm_info[cur_epid].net_stats
  								 .multicast += 1;
  				}
  			}
  
  			fjes_rxframe_release(adapter, cur_epid);
  			adapter->unset_rx_last = true;
  		} else {
  			break;
  		}
  	}
  
  	if (work_done < budget) {
  		napi_complete_done(napi, work_done);
  
  		if (adapter->unset_rx_last) {
  			adapter->rx_last_jiffies = jiffies;
  			adapter->unset_rx_last = false;
  		}
  
  		if (((long)jiffies - (long)adapter->rx_last_jiffies) < 3) {
  			napi_reschedule(napi);
  		} else {
  			spin_lock(&hw->rx_status_lock);
  			for (epidx = 0; epidx < hw->max_epid; epidx++) {
  				if (epidx == hw->my_epid)
  					continue;
  				if (fjes_hw_get_partner_ep_status(hw, epidx) ==
  				    EP_PARTNER_SHARED)
  					adapter->hw.ep_shm_info[epidx].tx
  						   .info->v1i.rx_status &=
  						~FJES_RX_POLL_WORK;
  			}
  			spin_unlock(&hw->rx_status_lock);
  
  			fjes_hw_set_irqmask(hw, REG_ICTL_MASK_RX_DATA, false);
  		}
  	}
  
  	return work_done;
  }
  
  /* fjes_probe - Device Initialization Routine */
  static int fjes_probe(struct platform_device *plat_dev)
  {
  	struct fjes_adapter *adapter;
  	struct net_device *netdev;
  	struct resource *res;
  	struct fjes_hw *hw;
  	int err;
  
  	err = -ENOMEM;
  	netdev = alloc_netdev_mq(sizeof(struct fjes_adapter), "es%d",
  				 NET_NAME_UNKNOWN, fjes_netdev_setup,
  				 FJES_MAX_QUEUES);
  
  	if (!netdev)
  		goto err_out;
  
  	SET_NETDEV_DEV(netdev, &plat_dev->dev);
  
  	dev_set_drvdata(&plat_dev->dev, netdev);
  	adapter = netdev_priv(netdev);
  	adapter->netdev = netdev;
  	adapter->plat_dev = plat_dev;
  	hw = &adapter->hw;
  	hw->back = adapter;
  
  	/* setup the private structure */
  	err = fjes_sw_init(adapter);
  	if (err)
  		goto err_free_netdev;
  
  	INIT_WORK(&adapter->force_close_task, fjes_force_close_task);
  	adapter->force_reset = false;
  	adapter->open_guard = false;
  
  	adapter->txrx_wq = alloc_workqueue(DRV_NAME "/txrx", WQ_MEM_RECLAIM, 0);
  	adapter->control_wq = alloc_workqueue(DRV_NAME "/control",
  					      WQ_MEM_RECLAIM, 0);
  
  	INIT_WORK(&adapter->tx_stall_task, fjes_tx_stall_task);
  	INIT_WORK(&adapter->raise_intr_rxdata_task,
  		  fjes_raise_intr_rxdata_task);
  	INIT_WORK(&adapter->unshare_watch_task, fjes_watch_unshare_task);
  	adapter->unshare_watch_bitmask = 0;
  
  	INIT_DELAYED_WORK(&adapter->interrupt_watch_task, fjes_irq_watch_task);
  	adapter->interrupt_watch_enable = false;
  
  	res = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
  	hw->hw_res.start = res->start;
  	hw->hw_res.size = resource_size(res);
  	hw->hw_res.irq = platform_get_irq(plat_dev, 0);
  	err = fjes_hw_init(&adapter->hw);
  	if (err)
  		goto err_free_netdev;
  
  	/* setup MAC address (02:00:00:00:00:[epid])*/
  	netdev->dev_addr[0] = 2;
  	netdev->dev_addr[1] = 0;
  	netdev->dev_addr[2] = 0;
  	netdev->dev_addr[3] = 0;
  	netdev->dev_addr[4] = 0;
  	netdev->dev_addr[5] = hw->my_epid; /* EPID */
  
  	err = register_netdev(netdev);
  	if (err)
  		goto err_hw_exit;
  
  	netif_carrier_off(netdev);
  
  	fjes_dbg_adapter_init(adapter);
  
  	return 0;
  
  err_hw_exit:
  	fjes_hw_exit(&adapter->hw);
  err_free_netdev:
  	free_netdev(netdev);
  err_out:
  	return err;
  }
  
  /* fjes_remove - Device Removal Routine */
  static int fjes_remove(struct platform_device *plat_dev)
  {
  	struct net_device *netdev = dev_get_drvdata(&plat_dev->dev);
  	struct fjes_adapter *adapter = netdev_priv(netdev);
  	struct fjes_hw *hw = &adapter->hw;
  
  	fjes_dbg_adapter_exit(adapter);
  
  	cancel_delayed_work_sync(&adapter->interrupt_watch_task);
  	cancel_work_sync(&adapter->unshare_watch_task);
  	cancel_work_sync(&adapter->raise_intr_rxdata_task);
  	cancel_work_sync(&adapter->tx_stall_task);
  	if (adapter->control_wq)
  		destroy_workqueue(adapter->control_wq);
  	if (adapter->txrx_wq)
  		destroy_workqueue(adapter->txrx_wq);
  
  	unregister_netdev(netdev);
  
  	fjes_hw_exit(hw);
  
  	netif_napi_del(&adapter->napi);
  
  	free_netdev(netdev);
  
  	return 0;
  }
  
  static int fjes_sw_init(struct fjes_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  
  	netif_napi_add(netdev, &adapter->napi, fjes_poll, 64);
  
  	return 0;
  }
  
  /* fjes_netdev_setup - netdevice initialization routine */
  static void fjes_netdev_setup(struct net_device *netdev)
  {
  	ether_setup(netdev);
  
  	netdev->watchdog_timeo = FJES_TX_RETRY_INTERVAL;
  	netdev->netdev_ops = &fjes_netdev_ops;
  	fjes_set_ethtool_ops(netdev);
  	netdev->mtu = fjes_support_mtu[3];
  	netdev->min_mtu = fjes_support_mtu[0];
  	netdev->max_mtu = fjes_support_mtu[3];
  	netdev->flags |= IFF_BROADCAST;
  	netdev->features |= NETIF_F_HW_CSUM | NETIF_F_HW_VLAN_CTAG_FILTER;
  }
  
  static void fjes_irq_watch_task(struct work_struct *work)
  {
  	struct fjes_adapter *adapter = container_of(to_delayed_work(work),
  			struct fjes_adapter, interrupt_watch_task);
  
  	local_irq_disable();
  	fjes_intr(adapter->hw.hw_res.irq, adapter);
  	local_irq_enable();
  
  	if (fjes_rxframe_search_exist(adapter, 0) >= 0)
  		napi_schedule(&adapter->napi);
  
  	if (adapter->interrupt_watch_enable) {
  		if (!delayed_work_pending(&adapter->interrupt_watch_task))
  			queue_delayed_work(adapter->control_wq,
  					   &adapter->interrupt_watch_task,
  					   FJES_IRQ_WATCH_DELAY);
  	}
  }
  
  static void fjes_watch_unshare_task(struct work_struct *work)
  {
  	struct fjes_adapter *adapter =
  	container_of(work, struct fjes_adapter, unshare_watch_task);
  
  	struct net_device *netdev = adapter->netdev;
  	struct fjes_hw *hw = &adapter->hw;
  
  	int unshare_watch, unshare_reserve;
  	int max_epid, my_epid, epidx;
  	int stop_req, stop_req_done;
  	ulong unshare_watch_bitmask;
  	unsigned long flags;
  	int wait_time = 0;
  	int is_shared;
  	int ret;
  
  	my_epid = hw->my_epid;
  	max_epid = hw->max_epid;
  
  	unshare_watch_bitmask = adapter->unshare_watch_bitmask;
  	adapter->unshare_watch_bitmask = 0;
  
  	while ((unshare_watch_bitmask || hw->txrx_stop_req_bit) &&
  	       (wait_time < 3000)) {
  		for (epidx = 0; epidx < hw->max_epid; epidx++) {
  			if (epidx == hw->my_epid)
  				continue;
  
  			is_shared = fjes_hw_epid_is_shared(hw->hw_info.share,
  							   epidx);
  
  			stop_req = test_bit(epidx, &hw->txrx_stop_req_bit);
  
  			stop_req_done = hw->ep_shm_info[epidx].rx.info->v1i.rx_status &
  					FJES_RX_STOP_REQ_DONE;
  
  			unshare_watch = test_bit(epidx, &unshare_watch_bitmask);
  
  			unshare_reserve = test_bit(epidx,
  						   &hw->hw_info.buffer_unshare_reserve_bit);
  
  			if ((!stop_req ||
  			     (is_shared && (!is_shared || !stop_req_done))) &&
  			    (is_shared || !unshare_watch || !unshare_reserve))
  				continue;
  
  			mutex_lock(&hw->hw_info.lock);
  			ret = fjes_hw_unregister_buff_addr(hw, epidx);
  			switch (ret) {
  			case 0:
  				break;
  			case -ENOMSG:
  			case -EBUSY:
  			default:
  				if (!work_pending(
  					&adapter->force_close_task)) {
  					adapter->force_reset = true;
  					schedule_work(
  						&adapter->force_close_task);
  				}
  				break;
  			}
  			mutex_unlock(&hw->hw_info.lock);
  			hw->ep_shm_info[epidx].ep_stats
  					.com_unregist_buf_exec += 1;
  
  			spin_lock_irqsave(&hw->rx_status_lock, flags);
  			fjes_hw_setup_epbuf(&hw->ep_shm_info[epidx].tx,
  					    netdev->dev_addr, netdev->mtu);
  			spin_unlock_irqrestore(&hw->rx_status_lock, flags);
  
  			clear_bit(epidx, &hw->txrx_stop_req_bit);
  			clear_bit(epidx, &unshare_watch_bitmask);
  			clear_bit(epidx,
  				  &hw->hw_info.buffer_unshare_reserve_bit);
  		}
  
  		msleep(100);
  		wait_time += 100;
  	}
  
  	if (hw->hw_info.buffer_unshare_reserve_bit) {
  		for (epidx = 0; epidx < hw->max_epid; epidx++) {
  			if (epidx == hw->my_epid)
  				continue;
  
  			if (test_bit(epidx,
  				     &hw->hw_info.buffer_unshare_reserve_bit)) {
  				mutex_lock(&hw->hw_info.lock);
  
  				ret = fjes_hw_unregister_buff_addr(hw, epidx);
  				switch (ret) {
  				case 0:
  					break;
  				case -ENOMSG:
  				case -EBUSY:
  				default:
  					if (!work_pending(
  						&adapter->force_close_task)) {
  						adapter->force_reset = true;
  						schedule_work(
  							&adapter->force_close_task);
  					}
  					break;
  				}
  				mutex_unlock(&hw->hw_info.lock);
  
  				hw->ep_shm_info[epidx].ep_stats
  					.com_unregist_buf_exec += 1;
  
  				spin_lock_irqsave(&hw->rx_status_lock, flags);
  				fjes_hw_setup_epbuf(
  					&hw->ep_shm_info[epidx].tx,
  					netdev->dev_addr, netdev->mtu);
  				spin_unlock_irqrestore(&hw->rx_status_lock,
  						       flags);
  
  				clear_bit(epidx, &hw->txrx_stop_req_bit);
  				clear_bit(epidx, &unshare_watch_bitmask);
  				clear_bit(epidx, &hw->hw_info.buffer_unshare_reserve_bit);
  			}
  
  			if (test_bit(epidx, &unshare_watch_bitmask)) {
  				spin_lock_irqsave(&hw->rx_status_lock, flags);
  				hw->ep_shm_info[epidx].tx.info->v1i.rx_status &=
  						~FJES_RX_STOP_REQ_DONE;
  				spin_unlock_irqrestore(&hw->rx_status_lock,
  						       flags);
  			}
  		}
  	}
  }
  
  /* fjes_init_module - Driver Registration Routine */
  static int __init fjes_init_module(void)
  {
  	int result;
  
  	pr_info("%s - version %s - %s\n",
  		fjes_driver_string, fjes_driver_version, fjes_copyright);
  
  	fjes_dbg_init();
  
  	result = platform_driver_register(&fjes_driver);
  	if (result < 0) {
  		fjes_dbg_exit();
  		return result;
  	}
  
  	result = acpi_bus_register_driver(&fjes_acpi_driver);
  	if (result < 0)
  		goto fail_acpi_driver;
  
  	return 0;
  
  fail_acpi_driver:
  	platform_driver_unregister(&fjes_driver);
  	fjes_dbg_exit();
  	return result;
  }
  
  module_init(fjes_init_module);
  
  /* fjes_exit_module - Driver Exit Cleanup Routine */
  static void __exit fjes_exit_module(void)
  {
  	acpi_bus_unregister_driver(&fjes_acpi_driver);
  	platform_driver_unregister(&fjes_driver);
  	fjes_dbg_exit();
  }
  
  module_exit(fjes_exit_module);
  