text: /*
   * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
   *
   * 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, write to the Free Software Foundation, Inc.,
   * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Maintained at www.Open-FCoE.org
   */
  
  #include <linux/module.h>
  #include <linux/version.h>
  #include <linux/spinlock.h>
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/ethtool.h>
  #include <linux/if_ether.h>
  #include <linux/if_vlan.h>
  #include <linux/crc32.h>
  #include <linux/slab.h>
  #include <linux/cpu.h>
  #include <linux/fs.h>
  #include <linux/sysfs.h>
  #include <linux/ctype.h>
  #include <scsi/scsi_tcq.h>
  #include <scsi/scsicam.h>
  #include <scsi/scsi_transport.h>
  #include <scsi/scsi_transport_fc.h>
  #include <net/rtnetlink.h>
  
  #include <scsi/fc/fc_encaps.h>
  #include <scsi/fc/fc_fip.h>
  
  #include <scsi/libfc.h>
  #include <scsi/fc_frame.h>
  #include <scsi/libfcoe.h>
  
  #include "fcoe.h"
  
  MODULE_AUTHOR("Open-FCoE.org");
  MODULE_DESCRIPTION("FCoE");
  MODULE_LICENSE("GPL v2");
  
  /* Performance tuning parameters for fcoe */
  static unsigned int fcoe_ddp_min;
  module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR);
  MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for "	\
  		 "Direct Data Placement (DDP).");
  
  DEFINE_MUTEX(fcoe_config_mutex);
  
  /* fcoe_percpu_clean completion.  Waiter protected by fcoe_create_mutex */
  static DECLARE_COMPLETION(fcoe_flush_completion);
  
  /* fcoe host list */
  /* must only by accessed under the RTNL mutex */
  LIST_HEAD(fcoe_hostlist);
  DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
  
  /* Function Prototypes */
  static int fcoe_reset(struct Scsi_Host *);
  static int fcoe_xmit(struct fc_lport *, struct fc_frame *);
  static int fcoe_rcv(struct sk_buff *, struct net_device *,
  		    struct packet_type *, struct net_device *);
  static int fcoe_percpu_receive_thread(void *);
  static void fcoe_clean_pending_queue(struct fc_lport *);
  static void fcoe_percpu_clean(struct fc_lport *);
  static int fcoe_link_speed_update(struct fc_lport *);
  static int fcoe_link_ok(struct fc_lport *);
  
  static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *);
  static int fcoe_hostlist_add(const struct fc_lport *);
  
  static void fcoe_check_wait_queue(struct fc_lport *, struct sk_buff *);
  static int fcoe_device_notification(struct notifier_block *, ulong, void *);
  static void fcoe_dev_setup(void);
  static void fcoe_dev_cleanup(void);
  static struct fcoe_interface
  *fcoe_hostlist_lookup_port(const struct net_device *);
  
  static int fcoe_fip_recv(struct sk_buff *, struct net_device *,
  			 struct packet_type *, struct net_device *);
  
  static void fcoe_fip_send(struct fcoe_ctlr *, struct sk_buff *);
  static void fcoe_update_src_mac(struct fc_lport *, u8 *);
  static u8 *fcoe_get_src_mac(struct fc_lport *);
  static void fcoe_destroy_work(struct work_struct *);
  
  static int fcoe_ddp_setup(struct fc_lport *, u16, struct scatterlist *,
  			  unsigned int);
  static int fcoe_ddp_done(struct fc_lport *, u16);
  
  static int fcoe_cpu_callback(struct notifier_block *, unsigned long, void *);
  
  static int fcoe_create(const char *, struct kernel_param *);
  static int fcoe_destroy(const char *, struct kernel_param *);
  static int fcoe_enable(const char *, struct kernel_param *);
  static int fcoe_disable(const char *, struct kernel_param *);
  
  static struct fc_seq *fcoe_elsct_send(struct fc_lport *,
  				      u32 did, struct fc_frame *,
  				      unsigned int op,
  				      void (*resp)(struct fc_seq *,
  						   struct fc_frame *,
  						   void *),
  				      void *, u32 timeout);
  static void fcoe_recv_frame(struct sk_buff *skb);
  
  static void fcoe_get_lesb(struct fc_lport *, struct fc_els_lesb *);
  
  module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR);
  __MODULE_PARM_TYPE(create, "string");
  MODULE_PARM_DESC(create, " Creates fcoe instance on a ethernet interface");
  module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR);
  __MODULE_PARM_TYPE(destroy, "string");
  MODULE_PARM_DESC(destroy, " Destroys fcoe instance on a ethernet interface");
  module_param_call(enable, fcoe_enable, NULL, NULL, S_IWUSR);
  __MODULE_PARM_TYPE(enable, "string");
  MODULE_PARM_DESC(enable, " Enables fcoe on a ethernet interface.");
  module_param_call(disable, fcoe_disable, NULL, NULL, S_IWUSR);
  __MODULE_PARM_TYPE(disable, "string");
  MODULE_PARM_DESC(disable, " Disables fcoe on a ethernet interface.");
  
  /* notification function for packets from net device */
  static struct notifier_block fcoe_notifier = {
  	.notifier_call = fcoe_device_notification,
  };
  
  /* notification function for CPU hotplug events */
  static struct notifier_block fcoe_cpu_notifier = {
  	.notifier_call = fcoe_cpu_callback,
  };
  
  static struct scsi_transport_template *fcoe_transport_template;
  static struct scsi_transport_template *fcoe_vport_transport_template;
  
  static int fcoe_vport_destroy(struct fc_vport *);
  static int fcoe_vport_create(struct fc_vport *, bool disabled);
  static int fcoe_vport_disable(struct fc_vport *, bool disable);
  static void fcoe_set_vport_symbolic_name(struct fc_vport *);
  static void fcoe_set_port_id(struct fc_lport *, u32, struct fc_frame *);
  
  static struct libfc_function_template fcoe_libfc_fcn_templ = {
  	.frame_send = fcoe_xmit,
  	.ddp_setup = fcoe_ddp_setup,
  	.ddp_done = fcoe_ddp_done,
  	.elsct_send = fcoe_elsct_send,
  	.get_lesb = fcoe_get_lesb,
  	.lport_set_port_id = fcoe_set_port_id,
  };
  
  struct fc_function_template fcoe_transport_function = {
  	.show_host_node_name = 1,
  	.show_host_port_name = 1,
  	.show_host_supported_classes = 1,
  	.show_host_supported_fc4s = 1,
  	.show_host_active_fc4s = 1,
  	.show_host_maxframe_size = 1,
  
  	.show_host_port_id = 1,
  	.show_host_supported_speeds = 1,
  	.get_host_speed = fc_get_host_speed,
  	.show_host_speed = 1,
  	.show_host_port_type = 1,
  	.get_host_port_state = fc_get_host_port_state,
  	.show_host_port_state = 1,
  	.show_host_symbolic_name = 1,
  
  	.dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
  	.show_rport_maxframe_size = 1,
  	.show_rport_supported_classes = 1,
  
  	.show_host_fabric_name = 1,
  	.show_starget_node_name = 1,
  	.show_starget_port_name = 1,
  	.show_starget_port_id = 1,
  	.set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
  	.show_rport_dev_loss_tmo = 1,
  	.get_fc_host_stats = fc_get_host_stats,
  	.issue_fc_host_lip = fcoe_reset,
  
  	.terminate_rport_io = fc_rport_terminate_io,
  
  	.vport_create = fcoe_vport_create,
  	.vport_delete = fcoe_vport_destroy,
  	.vport_disable = fcoe_vport_disable,
  	.set_vport_symbolic_name = fcoe_set_vport_symbolic_name,
  
  	.bsg_request = fc_lport_bsg_request,
  };
  
  struct fc_function_template fcoe_vport_transport_function = {
  	.show_host_node_name = 1,
  	.show_host_port_name = 1,
  	.show_host_supported_classes = 1,
  	.show_host_supported_fc4s = 1,
  	.show_host_active_fc4s = 1,
  	.show_host_maxframe_size = 1,
  
  	.show_host_port_id = 1,
  	.show_host_supported_speeds = 1,
  	.get_host_speed = fc_get_host_speed,
  	.show_host_speed = 1,
  	.show_host_port_type = 1,
  	.get_host_port_state = fc_get_host_port_state,
  	.show_host_port_state = 1,
  	.show_host_symbolic_name = 1,
  
  	.dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
  	.show_rport_maxframe_size = 1,
  	.show_rport_supported_classes = 1,
  
  	.show_host_fabric_name = 1,
  	.show_starget_node_name = 1,
  	.show_starget_port_name = 1,
  	.show_starget_port_id = 1,
  	.set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
  	.show_rport_dev_loss_tmo = 1,
  	.get_fc_host_stats = fc_get_host_stats,
  	.issue_fc_host_lip = fcoe_reset,
  
  	.terminate_rport_io = fc_rport_terminate_io,
  
  	.bsg_request = fc_lport_bsg_request,
  };
  
  static struct scsi_host_template fcoe_shost_template = {
  	.module = THIS_MODULE,
  	.name = "FCoE Driver",
  	.proc_name = FCOE_NAME,
  	.queuecommand = fc_queuecommand,
  	.eh_abort_handler = fc_eh_abort,
  	.eh_device_reset_handler = fc_eh_device_reset,
  	.eh_host_reset_handler = fc_eh_host_reset,
  	.slave_alloc = fc_slave_alloc,
  	.change_queue_depth = fc_change_queue_depth,
  	.change_queue_type = fc_change_queue_type,
  	.this_id = -1,
  	.cmd_per_lun = 3,
  	.can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
  	.use_clustering = ENABLE_CLUSTERING,
  	.sg_tablesize = SG_ALL,
  	.max_sectors = 0xffff,
  };
  
  /**
   * fcoe_interface_setup() - Setup a FCoE interface
   * @fcoe:   The new FCoE interface
   * @netdev: The net device that the fcoe interface is on
   *
   * Returns : 0 for success
   * Locking: must be called with the RTNL mutex held
   */
  static int fcoe_interface_setup(struct fcoe_interface *fcoe,
  				struct net_device *netdev)
  {
  	struct fcoe_ctlr *fip = &fcoe->ctlr;
  	struct netdev_hw_addr *ha;
  	struct net_device *real_dev;
  	u8 flogi_maddr[ETH_ALEN];
  	const struct net_device_ops *ops;
  
  	fcoe->netdev = netdev;
  
  	/* Let LLD initialize for FCoE */
  	ops = netdev->netdev_ops;
  	if (ops->ndo_fcoe_enable) {
  		if (ops->ndo_fcoe_enable(netdev))
  			FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE"
  					" specific feature for LLD.\n");
  	}
  
  	/* Do not support for bonding device */
  	if ((netdev->priv_flags & IFF_MASTER_ALB) ||
  	    (netdev->priv_flags & IFF_SLAVE_INACTIVE) ||
  	    (netdev->priv_flags & IFF_MASTER_8023AD)) {
  		FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n");
  		return -EOPNOTSUPP;
  	}
  
  	/* look for SAN MAC address, if multiple SAN MACs exist, only
  	 * use the first one for SPMA */
  	real_dev = (netdev->priv_flags & IFF_802_1Q_VLAN) ?
  		vlan_dev_real_dev(netdev) : netdev;
  	rcu_read_lock();
  	for_each_dev_addr(real_dev, ha) {
  		if ((ha->type == NETDEV_HW_ADDR_T_SAN) &&
  		    (is_valid_ether_addr(ha->addr))) {
  			memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN);
  			fip->spma = 1;
  			break;
  		}
  	}
  	rcu_read_unlock();
  
  	/* setup Source Mac Address */
  	if (!fip->spma)
  		memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len);
  
  	/*
  	 * Add FCoE MAC address as second unicast MAC address
  	 * or enter promiscuous mode if not capable of listening
  	 * for multiple unicast MACs.
  	 */
  	memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
  	dev_uc_add(netdev, flogi_maddr);
  	if (fip->spma)
  		dev_uc_add(netdev, fip->ctl_src_addr);
  	dev_mc_add(netdev, FIP_ALL_ENODE_MACS);
  
  	/*
  	 * setup the receive function from ethernet driver
  	 * on the ethertype for the given device
  	 */
  	fcoe->fcoe_packet_type.func = fcoe_rcv;
  	fcoe->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
  	fcoe->fcoe_packet_type.dev = netdev;
  	dev_add_pack(&fcoe->fcoe_packet_type);
  
  	fcoe->fip_packet_type.func = fcoe_fip_recv;
  	fcoe->fip_packet_type.type = htons(ETH_P_FIP);
  	fcoe->fip_packet_type.dev = netdev;
  	dev_add_pack(&fcoe->fip_packet_type);
  
  	return 0;
  }
  
  /**
   * fcoe_interface_create() - Create a FCoE interface on a net device
   * @netdev: The net device to create the FCoE interface on
   *
   * Returns: pointer to a struct fcoe_interface or NULL on error
   */
  static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev)
  {
  	struct fcoe_interface *fcoe;
  	int err;
  
  	fcoe = kzalloc(sizeof(*fcoe), GFP_KERNEL);
  	if (!fcoe) {
  		FCOE_NETDEV_DBG(netdev, "Could not allocate fcoe structure\n");
  		return NULL;
  	}
  
  	dev_hold(netdev);
  	kref_init(&fcoe->kref);
  
  	/*
  	 * Initialize FIP.
  	 */
  	fcoe_ctlr_init(&fcoe->ctlr);
  	fcoe->ctlr.send = fcoe_fip_send;
  	fcoe->ctlr.update_mac = fcoe_update_src_mac;
  	fcoe->ctlr.get_src_addr = fcoe_get_src_mac;
  
  	err = fcoe_interface_setup(fcoe, netdev);
  	if (err) {
  		fcoe_ctlr_destroy(&fcoe->ctlr);
  		kfree(fcoe);
  		dev_put(netdev);
  		return NULL;
  	}
  
  	return fcoe;
  }
  
  /**
   * fcoe_interface_cleanup() - Clean up a FCoE interface
   * @fcoe: The FCoE interface to be cleaned up
   *
   * Caller must be holding the RTNL mutex
   */
  void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
  {
  	struct net_device *netdev = fcoe->netdev;
  	struct fcoe_ctlr *fip = &fcoe->ctlr;
  	u8 flogi_maddr[ETH_ALEN];
  	const struct net_device_ops *ops;
  
  	/*
  	 * Don't listen for Ethernet packets anymore.
  	 * synchronize_net() ensures that the packet handlers are not running
  	 * on another CPU. dev_remove_pack() would do that, this calls the
  	 * unsyncronized version __dev_remove_pack() to avoid multiple delays.
  	 */
  	__dev_remove_pack(&fcoe->fcoe_packet_type);
  	__dev_remove_pack(&fcoe->fip_packet_type);
  	synchronize_net();
  
  	/* Delete secondary MAC addresses */
  	memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
  	dev_uc_del(netdev, flogi_maddr);
  	if (fip->spma)
  		dev_uc_del(netdev, fip->ctl_src_addr);
  	dev_mc_del(netdev, FIP_ALL_ENODE_MACS);
  
  	/* Tell the LLD we are done w/ FCoE */
  	ops = netdev->netdev_ops;
  	if (ops->ndo_fcoe_disable) {
  		if (ops->ndo_fcoe_disable(netdev))
  			FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE"
  					" specific feature for LLD.\n");
  	}
  }
  
  /**
   * fcoe_interface_release() - fcoe_port kref release function
   * @kref: Embedded reference count in an fcoe_interface struct
   */
  static void fcoe_interface_release(struct kref *kref)
  {
  	struct fcoe_interface *fcoe;
  	struct net_device *netdev;
  
  	fcoe = container_of(kref, struct fcoe_interface, kref);
  	netdev = fcoe->netdev;
  	/* tear-down the FCoE controller */
  	fcoe_ctlr_destroy(&fcoe->ctlr);
  	kfree(fcoe);
  	dev_put(netdev);
  }
  
  /**
   * fcoe_interface_get() - Get a reference to a FCoE interface
   * @fcoe: The FCoE interface to be held
   */
  static inline void fcoe_interface_get(struct fcoe_interface *fcoe)
  {
  	kref_get(&fcoe->kref);
  }
  
  /**
   * fcoe_interface_put() - Put a reference to a FCoE interface
   * @fcoe: The FCoE interface to be released
   */
  static inline void fcoe_interface_put(struct fcoe_interface *fcoe)
  {
  	kref_put(&fcoe->kref, fcoe_interface_release);
  }
  
  /**
   * fcoe_fip_recv() - Handler for received FIP frames
   * @skb:      The receive skb
   * @netdev:   The associated net device
   * @ptype:    The packet_type structure which was used to register this handler
   * @orig_dev: The original net_device the the skb was received on.
   *	      (in case dev is a bond)
   *
   * Returns: 0 for success
   */
  static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev,
  			 struct packet_type *ptype,
  			 struct net_device *orig_dev)
  {
  	struct fcoe_interface *fcoe;
  
  	fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type);
  	fcoe_ctlr_recv(&fcoe->ctlr, skb);
  	return 0;
  }
  
  /**
   * fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame
   * @fip: The FCoE controller
   * @skb: The FIP packet to be sent
   */
  static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
  {
  	skb->dev = fcoe_from_ctlr(fip)->netdev;
  	dev_queue_xmit(skb);
  }
  
  /**
   * fcoe_update_src_mac() - Update the Ethernet MAC filters
   * @lport: The local port to update the source MAC on
   * @addr:  Unicast MAC address to add
   *
   * Remove any previously-set unicast MAC filter.
   * Add secondary FCoE MAC address filter for our OUI.
   */
  static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr)
  {
  	struct fcoe_port *port = lport_priv(lport);
  	struct fcoe_interface *fcoe = port->fcoe;
  
  	rtnl_lock();
  	if (!is_zero_ether_addr(port->data_src_addr))
  		dev_uc_del(fcoe->netdev, port->data_src_addr);
  	if (!is_zero_ether_addr(addr))
  		dev_uc_add(fcoe->netdev, addr);
  	memcpy(port->data_src_addr, addr, ETH_ALEN);
  	rtnl_unlock();
  }
  
  /**
   * fcoe_get_src_mac() - return the Ethernet source address for an lport
   * @lport: libfc lport
   */
  static u8 *fcoe_get_src_mac(struct fc_lport *lport)
  {
  	struct fcoe_port *port = lport_priv(lport);
  
  	return port->data_src_addr;
  }
  
  /**
   * fcoe_lport_config() - Set up a local port
   * @lport: The local port to be setup
   *
   * Returns: 0 for success
   */
  static int fcoe_lport_config(struct fc_lport *lport)
  {
  	lport->link_up = 0;
  	lport->qfull = 0;
  	lport->max_retry_count = 3;
  	lport->max_rport_retry_count = 3;
  	lport->e_d_tov = 2 * 1000;	/* FC-FS default */
  	lport->r_a_tov = 2 * 2 * 1000;
  	lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
  				 FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
  	lport->does_npiv = 1;
  
  	fc_lport_init_stats(lport);
  
  	/* lport fc_lport related configuration */
  	fc_lport_config(lport);
  
  	/* offload related configuration */
  	lport->crc_offload = 0;
  	lport->seq_offload = 0;
  	lport->lro_enabled = 0;
  	lport->lro_xid = 0;
  	lport->lso_max = 0;
  
  	return 0;
  }
  
  /**
   * fcoe_queue_timer() - The fcoe queue timer
   * @lport: The local port
   *
   * Calls fcoe_check_wait_queue on timeout
   */
  static void fcoe_queue_timer(ulong lport)
  {
  	fcoe_check_wait_queue((struct fc_lport *)lport, NULL);
  }
  
  /**
   * fcoe_get_wwn() - Get the world wide name from LLD if it supports it
   * @netdev: the associated net device
   * @wwn: the output WWN
   * @type: the type of WWN (WWPN or WWNN)
   *
   * Returns: 0 for success
   */
  static int fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
  {
  	const struct net_device_ops *ops = netdev->netdev_ops;
  
  	if (ops->ndo_fcoe_get_wwn)
  		return ops->ndo_fcoe_get_wwn(netdev, wwn, type);
  	return -EINVAL;
  }
  
  /**
   * fcoe_netdev_config() - Set up net devive for SW FCoE
   * @lport:  The local port that is associated with the net device
   * @netdev: The associated net device
   *
   * Must be called after fcoe_lport_config() as it will use local port mutex
   *
   * Returns: 0 for success
   */
  static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev)
  {
  	u32 mfs;
  	u64 wwnn, wwpn;
  	struct fcoe_interface *fcoe;
  	struct fcoe_port *port;
  	int vid = 0;
  
  	/* Setup lport private data to point to fcoe softc */
  	port = lport_priv(lport);
  	fcoe = port->fcoe;
  
  	/*
  	 * Determine max frame size based on underlying device and optional
  	 * user-configured limit.  If the MFS is too low, fcoe_link_ok()
  	 * will return 0, so do this first.
  	 */
  	mfs = netdev->mtu;
  	if (netdev->features & NETIF_F_FCOE_MTU) {
  		mfs = FCOE_MTU;
  		FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs);
  	}
  	mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof));
  	if (fc_set_mfs(lport, mfs))
  		return -EINVAL;
  
  	/* offload features support */
  	if (netdev->features & NETIF_F_SG)
  		lport->sg_supp = 1;
  
  	if (netdev->features & NETIF_F_FCOE_CRC) {
  		lport->crc_offload = 1;
  		FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
  	}
  	if (netdev->features & NETIF_F_FSO) {
  		lport->seq_offload = 1;
  		lport->lso_max = netdev->gso_max_size;
  		FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
  				lport->lso_max);
  	}
  	if (netdev->fcoe_ddp_xid) {
  		lport->lro_enabled = 1;
  		lport->lro_xid = netdev->fcoe_ddp_xid;
  		FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
  				lport->lro_xid);
  	}
  	skb_queue_head_init(&port->fcoe_pending_queue);
  	port->fcoe_pending_queue_active = 0;
  	setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport);
  
  	fcoe_link_speed_update(lport);
  
  	if (!lport->vport) {
  		/*
  		 * Use NAA 1&2 (FC-FS Rev. 2.0, Sec. 15) to generate WWNN/WWPN:
  		 * For WWNN, we use NAA 1 w/ bit 27-16 of word 0 as 0.
  		 * For WWPN, we use NAA 2 w/ bit 27-16 of word 0 from VLAN ID
  		 */
  		if (netdev->priv_flags & IFF_802_1Q_VLAN)
  			vid = vlan_dev_vlan_id(netdev);
  
  		if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN))
  			wwnn = fcoe_wwn_from_mac(fcoe->ctlr.ctl_src_addr, 1, 0);
  		fc_set_wwnn(lport, wwnn);
  		if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN))
  			wwpn = fcoe_wwn_from_mac(fcoe->ctlr.ctl_src_addr,
  						 2, vid);
  		fc_set_wwpn(lport, wwpn);
  	}
  
  	return 0;
  }
  
  /**
   * fcoe_shost_config() - Set up the SCSI host associated with a local port
   * @lport: The local port
   * @dev:   The device associated with the SCSI host
   *
   * Must be called after fcoe_lport_config() and fcoe_netdev_config()
   *
   * Returns: 0 for success
   */
  static int fcoe_shost_config(struct fc_lport *lport, struct device *dev)
  {
  	int rc = 0;
  
  	/* lport scsi host config */
  	lport->host->max_lun = FCOE_MAX_LUN;
  	lport->host->max_id = FCOE_MAX_FCP_TARGET;
  	lport->host->max_channel = 0;
  	lport->host->max_cmd_len = FCOE_MAX_CMD_LEN;
  
  	if (lport->vport)
  		lport->host->transportt = fcoe_vport_transport_template;
  	else
  		lport->host->transportt = fcoe_transport_template;
  
  	/* add the new host to the SCSI-ml */
  	rc = scsi_add_host(lport->host, dev);
  	if (rc) {
  		FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: "
  				"error on scsi_add_host\n");
  		return rc;
  	}
  
  	if (!lport->vport)
  		fc_host_max_npiv_vports(lport->host) = USHRT_MAX;
  
  	snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
  		 "%s v%s over %s", FCOE_NAME, FCOE_VERSION,
  		 fcoe_netdev(lport)->name);
  
  	return 0;
  }
  
  /**
   * fcoe_oem_match() - The match routine for the offloaded exchange manager
   * @fp: The I/O frame
   *
   * This routine will be associated with an exchange manager (EM). When
   * the libfc exchange handling code is looking for an EM to use it will
   * call this routine and pass it the frame that it wishes to send. This
   * routine will return True if the associated EM is to be used and False
   * if the echange code should continue looking for an EM.
   *
   * The offload EM that this routine is associated with will handle any
   * packets that are for SCSI read requests.
   *
   * Returns: True for read types I/O, otherwise returns false.
   */
  bool fcoe_oem_match(struct fc_frame *fp)
  {
  	return fc_fcp_is_read(fr_fsp(fp)) &&
  		(fr_fsp(fp)->data_len > fcoe_ddp_min);
  }
  
  /**
   * fcoe_em_config() - Allocate and configure an exchange manager
   * @lport: The local port that the new EM will be associated with
   *
   * Returns: 0 on success
   */
  static inline int fcoe_em_config(struct fc_lport *lport)
  {
  	struct fcoe_port *port = lport_priv(lport);
  	struct fcoe_interface *fcoe = port->fcoe;
  	struct fcoe_interface *oldfcoe = NULL;
  	struct net_device *old_real_dev, *cur_real_dev;
  	u16 min_xid = FCOE_MIN_XID;
  	u16 max_xid = FCOE_MAX_XID;
  
  	/*
  	 * Check if need to allocate an em instance for
  	 * offload exchange ids to be shared across all VN_PORTs/lport.
  	 */
  	if (!lport->lro_enabled || !lport->lro_xid ||
  	    (lport->lro_xid >= max_xid)) {
  		lport->lro_xid = 0;
  		goto skip_oem;
  	}
  
  	/*
  	 * Reuse existing offload em instance in case
  	 * it is already allocated on real eth device
  	 */
  	if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
  		cur_real_dev = vlan_dev_real_dev(fcoe->netdev);
  	else
  		cur_real_dev = fcoe->netdev;
  
  	list_for_each_entry(oldfcoe, &fcoe_hostlist, list) {
  		if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
  			old_real_dev = vlan_dev_real_dev(oldfcoe->netdev);
  		else
  			old_real_dev = oldfcoe->netdev;
  
  		if (cur_real_dev == old_real_dev) {
  			fcoe->oem = oldfcoe->oem;
  			break;
  		}
  	}
  
  	if (fcoe->oem) {
  		if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) {
  			printk(KERN_ERR "fcoe_em_config: failed to add "
  			       "offload em:%p on interface:%s\n",
  			       fcoe->oem, fcoe->netdev->name);
  			return -ENOMEM;
  		}
  	} else {
  		fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3,
  					      FCOE_MIN_XID, lport->lro_xid,
  					      fcoe_oem_match);
  		if (!fcoe->oem) {
  			printk(KERN_ERR "fcoe_em_config: failed to allocate "
  			       "em for offload exches on interface:%s\n",
  			       fcoe->netdev->name);
  			return -ENOMEM;
  		}
  	}
  
  	/*
  	 * Exclude offload EM xid range from next EM xid range.
  	 */
  	min_xid += lport->lro_xid + 1;
  
  skip_oem:
  	if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) {
  		printk(KERN_ERR "fcoe_em_config: failed to "
  		       "allocate em on interface %s\n", fcoe->netdev->name);
  		return -ENOMEM;
  	}
  
  	return 0;
  }
  
  /**
   * fcoe_if_destroy() - Tear down a SW FCoE instance
   * @lport: The local port to be destroyed
   *
   * Locking: must be called with the RTNL mutex held and RTNL mutex
   * needed to be dropped by this function since not dropping RTNL
   * would cause circular locking warning on synchronous fip worker
   * cancelling thru fcoe_interface_put invoked by this function.
   *
   */
  static void fcoe_if_destroy(struct fc_lport *lport)
  {
  	struct fcoe_port *port = lport_priv(lport);
  	struct fcoe_interface *fcoe = port->fcoe;
  	struct net_device *netdev = fcoe->netdev;
  
  	FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
  
  	/* Logout of the fabric */
  	fc_fabric_logoff(lport);
  
  	/* Cleanup the fc_lport */
  	fc_lport_destroy(lport);
  	fc_fcp_destroy(lport);
  
  	/* Stop the transmit retry timer */
  	del_timer_sync(&port->timer);
  
  	/* Free existing transmit skbs */
  	fcoe_clean_pending_queue(lport);
  
  	if (!is_zero_ether_addr(port->data_src_addr))
  		dev_uc_del(netdev, port->data_src_addr);
  	rtnl_unlock();
  
  	/* receives may not be stopped until after this */
  	fcoe_interface_put(fcoe);
  
  	/* Free queued packets for the per-CPU receive threads */
  	fcoe_percpu_clean(lport);
  
  	/* Detach from the scsi-ml */
  	fc_remove_host(lport->host);
  	scsi_remove_host(lport->host);
  
  	/* There are no more rports or I/O, free the EM */
  	fc_exch_mgr_free(lport);
  
  	/* Free memory used by statistical counters */
  	fc_lport_free_stats(lport);
  
  	/* Release the Scsi_Host */
  	scsi_host_put(lport->host);
  	module_put(THIS_MODULE);
  }
  
  /**
   * fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device
   * @lport: The local port to setup DDP for
   * @xid:   The exchange ID for this DDP transfer
   * @sgl:   The scatterlist describing this transfer
   * @sgc:   The number of sg items
   *
   * Returns: 0 if the DDP context was not configured
   */
  static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid,
  			  struct scatterlist *sgl, unsigned int sgc)
  {
  	struct net_device *netdev = fcoe_netdev(lport);
  
  	if (netdev->netdev_ops->ndo_fcoe_ddp_setup)
  		return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev,
  							      xid, sgl,
  							      sgc);
  
  	return 0;
  }
  
  /**
   * fcoe_ddp_done() - Call a LLD's ddp_done through the net device
   * @lport: The local port to complete DDP on
   * @xid:   The exchange ID for this DDP transfer
   *
   * Returns: the length of data that have been completed by DDP
   */
  static int fcoe_ddp_done(struct fc_lport *lport, u16 xid)
  {
  	struct net_device *netdev = fcoe_netdev(lport);
  
  	if (netdev->netdev_ops->ndo_fcoe_ddp_done)
  		return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid);
  	return 0;
  }
  
  /**
   * fcoe_if_create() - Create a FCoE instance on an interface
   * @fcoe:   The FCoE interface to create a local port on
   * @parent: The device pointer to be the parent in sysfs for the SCSI host
   * @npiv:   Indicates if the port is a vport or not
   *
   * Creates a fc_lport instance and a Scsi_Host instance and configure them.
   *
   * Returns: The allocated fc_lport or an error pointer
   */
  static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe,
  				       struct device *parent, int npiv)
  {
  	struct net_device *netdev = fcoe->netdev;
  	struct fc_lport *lport = NULL;
  	struct fcoe_port *port;
  	int rc;
  	/*
  	 * parent is only a vport if npiv is 1,
  	 * but we'll only use vport in that case so go ahead and set it
  	 */
  	struct fc_vport *vport = dev_to_vport(parent);
  
  	FCOE_NETDEV_DBG(netdev, "Create Interface\n");
  
  	if (!npiv) {
  		lport = libfc_host_alloc(&fcoe_shost_template,
  					 sizeof(struct fcoe_port));
  	} else	{
  		lport = libfc_vport_create(vport,
  					   sizeof(struct fcoe_port));
  	}
  	if (!lport) {
  		FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n");
  		rc = -ENOMEM;
  		goto out;
  	}
  	port = lport_priv(lport);
  	port->lport = lport;
  	port->fcoe = fcoe;
  	INIT_WORK(&port->destroy_work, fcoe_destroy_work);
  
  	/* configure a fc_lport including the exchange manager */
  	rc = fcoe_lport_config(lport);
  	if (rc) {
  		FCOE_NETDEV_DBG(netdev, "Could not configure lport for the "
  				"interface\n");
  		goto out_host_put;
  	}
  
  	if (npiv) {
  		FCOE_NETDEV_DBG(netdev, "Setting vport names, "
  				"%16.16llx %16.16llx\n",
  				vport->node_name, vport->port_name);
  		fc_set_wwnn(lport, vport->node_name);
  		fc_set_wwpn(lport, vport->port_name);
  	}
  
  	/* configure lport network properties */
  	rc = fcoe_netdev_config(lport, netdev);
  	if (rc) {
  		FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the "
  				"interface\n");
  		goto out_lp_destroy;
  	}
  
  	/* configure lport scsi host properties */
  	rc = fcoe_shost_config(lport, parent);
  	if (rc) {
  		FCOE_NETDEV_DBG(netdev, "Could not configure shost for the "
  				"interface\n");
  		goto out_lp_destroy;
  	}
  
  	/* Initialize the library */
  	rc = fcoe_libfc_config(lport, &fcoe_libfc_fcn_templ);
  	if (rc) {
  		FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the "
  				"interface\n");
  		goto out_lp_destroy;
  	}
  
  	if (!npiv) {
  		/*
  		 * fcoe_em_alloc() and fcoe_hostlist_add() both
  		 * need to be atomic with respect to other changes to the
  		 * hostlist since fcoe_em_alloc() looks for an existing EM
  		 * instance on host list updated by fcoe_hostlist_add().
  		 *
  		 * This is currently handled through the fcoe_config_mutex
  		 * begin held.
  		 */
  
  		/* lport exch manager allocation */
  		rc = fcoe_em_config(lport);
  		if (rc) {
  			FCOE_NETDEV_DBG(netdev, "Could not configure the EM "
  					"for the interface\n");
  			goto out_lp_destroy;
  		}
  	}
  
  	fcoe_interface_get(fcoe);
  	return lport;
  
  out_lp_destroy:
  	fc_exch_mgr_free(lport);
  out_host_put:
  	scsi_host_put(lport->host);
  out:
  	return ERR_PTR(rc);
  }
  
  /**
   * fcoe_if_init() - Initialization routine for fcoe.ko
   *
   * Attaches the SW FCoE transport to the FC transport
   *
   * Returns: 0 on success
   */
  static int __init fcoe_if_init(void)
  {
  	/* attach to scsi transport */
  	fcoe_transport_template = fc_attach_transport(&fcoe_transport_function);
  	fcoe_vport_transport_template =
  		fc_attach_transport(&fcoe_vport_transport_function);
  
  	if (!fcoe_transport_template) {
  		printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n");
  		return -ENODEV;
  	}
  
  	return 0;
  }
  
  /**
   * fcoe_if_exit() - Tear down fcoe.ko
   *
   * Detaches the SW FCoE transport from the FC transport
   *
   * Returns: 0 on success
   */
  int __exit fcoe_if_exit(void)
  {
  	fc_release_transport(fcoe_transport_template);
  	fc_release_transport(fcoe_vport_transport_template);
  	fcoe_transport_template = NULL;
  	fcoe_vport_transport_template = NULL;
  	return 0;
  }
  
  /**
   * fcoe_percpu_thread_create() - Create a receive thread for an online CPU
   * @cpu: The CPU index of the CPU to create a receive thread for
   */
  static void fcoe_percpu_thread_create(unsigned int cpu)
  {
  	struct fcoe_percpu_s *p;
  	struct task_struct *thread;
  
  	p = &per_cpu(fcoe_percpu, cpu);
  
  	thread = kthread_create(fcoe_percpu_receive_thread,
  				(void *)p, "fcoethread/%d", cpu);
  
  	if (likely(!IS_ERR(thread))) {
  		kthread_bind(thread, cpu);
  		wake_up_process(thread);
  
  		spin_lock_bh(&p->fcoe_rx_list.lock);
  		p->thread = thread;
  		spin_unlock_bh(&p->fcoe_rx_list.lock);
  	}
  }
  
  /**
   * fcoe_percpu_thread_destroy() - Remove the receive thread of a CPU
   * @cpu: The CPU index of the CPU whose receive thread is to be destroyed
   *
   * Destroys a per-CPU Rx thread. Any pending skbs are moved to the
   * current CPU's Rx thread. If the thread being destroyed is bound to
   * the CPU processing this context the skbs will be freed.
   */
  static void fcoe_percpu_thread_destroy(unsigned int cpu)
  {
  	struct fcoe_percpu_s *p;
  	struct task_struct *thread;
  	struct page *crc_eof;
  	struct sk_buff *skb;
  #ifdef CONFIG_SMP
  	struct fcoe_percpu_s *p0;
  	unsigned targ_cpu = get_cpu();
  #endif /* CONFIG_SMP */
  
  	FCOE_DBG("Destroying receive thread for CPU %d\n", cpu);
  
  	/* Prevent any new skbs from being queued for this CPU. */
  	p = &per_cpu(fcoe_percpu, cpu);
  	spin_lock_bh(&p->fcoe_rx_list.lock);
  	thread = p->thread;
  	p->thread = NULL;
  	crc_eof = p->crc_eof_page;
  	p->crc_eof_page = NULL;
  	p->crc_eof_offset = 0;
  	spin_unlock_bh(&p->fcoe_rx_list.lock);
  
  #ifdef CONFIG_SMP
  	/*
  	 * Don't bother moving the skb's if this context is running
  	 * on the same CPU that is having its thread destroyed. This
  	 * can easily happen when the module is removed.
  	 */
  	if (cpu != targ_cpu) {
  		p0 = &per_cpu(fcoe_percpu, targ_cpu);
  		spin_lock_bh(&p0->fcoe_rx_list.lock);
  		if (p0->thread) {
  			FCOE_DBG("Moving frames from CPU %d to CPU %d\n",
  				 cpu, targ_cpu);
  
  			while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
  				__skb_queue_tail(&p0->fcoe_rx_list, skb);
  			spin_unlock_bh(&p0->fcoe_rx_list.lock);
  		} else {
  			/*
  			 * The targeted CPU is not initialized and cannot accept
  			 * new	skbs. Unlock the targeted CPU and drop the skbs
  			 * on the CPU that is going offline.
  			 */
  			while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
  				kfree_skb(skb);
  			spin_unlock_bh(&p0->fcoe_rx_list.lock);
  		}
  	} else {
  		/*
  		 * This scenario occurs when the module is being removed
  		 * and all threads are being destroyed. skbs will continue
  		 * to be shifted from the CPU thread that is being removed
  		 * to the CPU thread associated with the CPU that is processing
  		 * the module removal. Once there is only one CPU Rx thread it
  		 * will reach this case and we will drop all skbs and later
  		 * stop the thread.
  		 */
  		spin_lock_bh(&p->fcoe_rx_list.lock);
  		while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
  			kfree_skb(skb);
  		spin_unlock_bh(&p->fcoe_rx_list.lock);
  	}
  	put_cpu();
  #else
  	/*
  	 * This a non-SMP scenario where the singular Rx thread is
  	 * being removed. Free all skbs and stop the thread.
  	 */
  	spin_lock_bh(&p->fcoe_rx_list.lock);
  	while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
  		kfree_skb(skb);
  	spin_unlock_bh(&p->fcoe_rx_list.lock);
  #endif
  
  	if (thread)
  		kthread_stop(thread);
  
  	if (crc_eof)
  		put_page(crc_eof);
  }
  
  /**
   * fcoe_cpu_callback() - Handler for CPU hotplug events
   * @nfb:    The callback data block
   * @action: The event triggering the callback
   * @hcpu:   The index of the CPU that the event is for
   *
   * This creates or destroys per-CPU data for fcoe
   *
   * Returns NOTIFY_OK always.
   */
  static int fcoe_cpu_callback(struct notifier_block *nfb,
  			     unsigned long action, void *hcpu)
  {
  	unsigned cpu = (unsigned long)hcpu;
  
  	switch (action) {
  	case CPU_ONLINE:
  	case CPU_ONLINE_FROZEN:
  		FCOE_DBG("CPU %x online: Create Rx thread\n", cpu);
  		fcoe_percpu_thread_create(cpu);
  		break;
  	case CPU_DEAD:
  	case CPU_DEAD_FROZEN:
  		FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu);
  		fcoe_percpu_thread_destroy(cpu);
  		break;
  	default:
  		break;
  	}
  	return NOTIFY_OK;
  }
  
  /**
   * fcoe_rcv() - Receive packets from a net device
   * @skb:    The received packet
   * @netdev: The net device that the packet was received on
   * @ptype:  The packet type context
   * @olddev: The last device net device
   *
   * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a
   * FC frame and passes the frame to libfc.
   *
   * Returns: 0 for success
   */
  int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev,
  	     struct packet_type *ptype, struct net_device *olddev)
  {
  	struct fc_lport *lport;
  	struct fcoe_rcv_info *fr;
  	struct fcoe_interface *fcoe;
  	struct fc_frame_header *fh;
  	struct fcoe_percpu_s *fps;
  	unsigned int cpu;
  
  	fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type);
  	lport = fcoe->ctlr.lp;
  	if (unlikely(!lport)) {
  		FCOE_NETDEV_DBG(netdev, "Cannot find hba structure");
  		goto err2;
  	}
  	if (!lport->link_up)
  		goto err2;
  
  	FCOE_NETDEV_DBG(netdev, "skb_info: len:%d data_len:%d head:%p "
  			"data:%p tail:%p end:%p sum:%d dev:%s",
  			skb->len, skb->data_len, skb->head, skb->data,
  			skb_tail_pointer(skb), skb_end_pointer(skb),
  			skb->csum, skb->dev ? skb->dev->name : "<NULL>");
  
  	/* check for FCOE packet type */
  	if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) {
  		FCOE_NETDEV_DBG(netdev, "Wrong FC type frame");
  		goto err;
  	}
  
  	/*
  	 * Check for minimum frame length, and make sure required FCoE
  	 * and FC headers are pulled into the linear data area.
  	 */
  	if (unlikely((skb->len < FCOE_MIN_FRAME) ||
  		     !pskb_may_pull(skb, FCOE_HEADER_LEN)))
  		goto err;
  
  	skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
  	fh = (struct fc_frame_header *) skb_transport_header(skb);
  
  	fr = fcoe_dev_from_skb(skb);
  	fr->fr_dev = lport;
  	fr->ptype = ptype;
  
  	/*
  	 * In case the incoming frame's exchange is originated from
  	 * the initiator, then received frame's exchange id is ANDed
  	 * with fc_cpu_mask bits to get the same cpu on which exchange
  	 * was originated, otherwise just use the current cpu.
  	 */
  	if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)
  		cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask;
  	else
  		cpu = smp_processor_id();
  
  	fps = &per_cpu(fcoe_percpu, cpu);
  	spin_lock_bh(&fps->fcoe_rx_list.lock);
  	if (unlikely(!fps->thread)) {
  		/*
  		 * The targeted CPU is not ready, let's target
  		 * the first CPU now. For non-SMP systems this
  		 * will check the same CPU twice.
  		 */
  		FCOE_NETDEV_DBG(netdev, "CPU is online, but no receive thread "
  				"ready for incoming skb- using first online "
  				"CPU.\n");
  
  		spin_unlock_bh(&fps->fcoe_rx_list.lock);
  		cpu = cpumask_first(cpu_online_mask);
  		fps = &per_cpu(fcoe_percpu, cpu);
  		spin_lock_bh(&fps->fcoe_rx_list.lock);
  		if (!fps->thread) {
  			spin_unlock_bh(&fps->fcoe_rx_list.lock);
  			goto err;
  		}
  	}
  
  	/*
  	 * We now have a valid CPU that we're targeting for
  	 * this skb. We also have this receive thread locked,
  	 * so we're free to queue skbs into it's queue.
  	 */
  
  	/* If this is a SCSI-FCP frame, and this is already executing on the
  	 * correct CPU, and the queue for this CPU is empty, then go ahead
  	 * and process the frame directly in the softirq context.
  	 * This lets us process completions without context switching from the
  	 * NET_RX softirq, to our receive processing thread, and then back to
  	 * BLOCK softirq context.
  	 */
  	if (fh->fh_type == FC_TYPE_FCP &&
  	    cpu == smp_processor_id() &&
  	    skb_queue_empty(&fps->fcoe_rx_list)) {
  		spin_unlock_bh(&fps->fcoe_rx_list.lock);
  		fcoe_recv_frame(skb);
  	} else {
  		__skb_queue_tail(&fps->fcoe_rx_list, skb);
  		if (fps->fcoe_rx_list.qlen == 1)
  			wake_up_process(fps->thread);
  		spin_unlock_bh(&fps->fcoe_rx_list.lock);
  	}
  
  	return 0;
  err:
  	per_cpu_ptr(lport->dev_stats, get_cpu())->ErrorFrames++;
  	put_cpu();
  err2:
  	kfree_skb(skb);
  	return -1;
  }
  
  /**
   * fcoe_start_io() - Start FCoE I/O
   * @skb: The packet to be transmitted
   *
   * This routine is called from the net device to start transmitting
   * FCoE packets.
   *
   * Returns: 0 for success
   */
  static inline int fcoe_start_io(struct sk_buff *skb)
  {
  	struct sk_buff *nskb;
  	int rc;
  
  	nskb = skb_clone(skb, GFP_ATOMIC);
  	rc = dev_queue_xmit(nskb);
  	if (rc != 0)
  		return rc;
  	kfree_skb(skb);
  	return 0;
  }
  
  /**
   * fcoe_get_paged_crc_eof() - Allocate a page to be used for the trailer CRC
   * @skb:  The packet to be transmitted
   * @tlen: The total length of the trailer
   *
   * This routine allocates a page for frame trailers. The page is re-used if
   * there is enough room left on it for the current trailer. If there isn't
   * enough buffer left a new page is allocated for the trailer. Reference to
   * the page from this function as well as the skbs using the page fragments
   * ensure that the page is freed at the appropriate time.
   *
   * Returns: 0 for success
   */
  static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
  {
  	struct fcoe_percpu_s *fps;
  	struct page *page;
  
  	fps = &get_cpu_var(fcoe_percpu);
  	page = fps->crc_eof_page;
  	if (!page) {
  		page = alloc_page(GFP_ATOMIC);
  		if (!page) {
  			put_cpu_var(fcoe_percpu);
  			return -ENOMEM;
  		}
  		fps->crc_eof_page = page;
  		fps->crc_eof_offset = 0;
  	}
  
  	get_page(page);
  	skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
  			   fps->crc_eof_offset, tlen);
  	skb->len += tlen;
  	skb->data_len += tlen;
  	skb->truesize += tlen;
  	fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);
  
  	if (fps->crc_eof_offset >= PAGE_SIZE) {
  		fps->crc_eof_page = NULL;
  		fps->crc_eof_offset = 0;
  		put_page(page);
  	}
  	put_cpu_var(fcoe_percpu);
  	return 0;
  }
  
  /**
   * fcoe_fc_crc() - Calculates the CRC for a given frame
   * @fp: The frame to be checksumed
   *
   * This uses crc32() routine to calculate the CRC for a frame
   *
   * Return: The 32 bit CRC value
   */
  u32 fcoe_fc_crc(struct fc_frame *fp)
  {
  	struct sk_buff *skb = fp_skb(fp);
  	struct skb_frag_struct *frag;
  	unsigned char *data;
  	unsigned long off, len, clen;
  	u32 crc;
  	unsigned i;
  
  	crc = crc32(~0, skb->data, skb_headlen(skb));
  
  	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
  		frag = &skb_shinfo(skb)->frags[i];
  		off = frag->page_offset;
  		len = frag->size;
  		while (len > 0) {
  			clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
  			data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
  					   KM_SKB_DATA_SOFTIRQ);
  			crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
  			kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
  			off += clen;
  			len -= clen;
  		}
  	}
  	return crc;
  }
  
  /**
   * fcoe_xmit() - Transmit a FCoE frame
   * @lport: The local port that the frame is to be transmitted for
   * @fp:	   The frame to be transmitted
   *
   * Return: 0 for success
   */
  int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp)
  {
  	int wlen;
  	u32 crc;
  	struct ethhdr *eh;
  	struct fcoe_crc_eof *cp;
  	struct sk_buff *skb;
  	struct fcoe_dev_stats *stats;
  	struct fc_frame_header *fh;
  	unsigned int hlen;		/* header length implies the version */
  	unsigned int tlen;		/* trailer length */
  	unsigned int elen;		/* eth header, may include vlan */
  	struct fcoe_port *port = lport_priv(lport);
  	struct fcoe_interface *fcoe = port->fcoe;
  	u8 sof, eof;
  	struct fcoe_hdr *hp;
  
  	WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
  
  	fh = fc_frame_header_get(fp);
  	skb = fp_skb(fp);
  	wlen = skb->len / FCOE_WORD_TO_BYTE;
  
  	if (!lport->link_up) {
  		kfree_skb(skb);
  		return 0;
  	}
  
  	if (unlikely(fh->fh_type == FC_TYPE_ELS) &&
  	    fcoe_ctlr_els_send(&fcoe->ctlr, lport, skb))
  		return 0;
  
  	sof = fr_sof(fp);
  	eof = fr_eof(fp);
  
  	elen = sizeof(struct ethhdr);
  	hlen = sizeof(struct fcoe_hdr);
  	tlen = sizeof(struct fcoe_crc_eof);
  	wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
  
  	/* crc offload */
  	if (likely(lport->crc_offload)) {
  		skb->ip_summed = CHECKSUM_PARTIAL;
  		skb->csum_start = skb_headroom(skb);
  		skb->csum_offset = skb->len;
  		crc = 0;
  	} else {
  		skb->ip_summed = CHECKSUM_NONE;
  		crc = fcoe_fc_crc(fp);
  	}
  
  	/* copy port crc and eof to the skb buff */
  	if (skb_is_nonlinear(skb)) {
  		skb_frag_t *frag;
  		if (fcoe_get_paged_crc_eof(skb, tlen)) {
  			kfree_skb(skb);
  			return -ENOMEM;
  		}
  		frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
  		cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
  			+ frag->page_offset;
  	} else {
  		cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
  	}
  
  	memset(cp, 0, sizeof(*cp));
  	cp->fcoe_eof = eof;
  	cp->fcoe_crc32 = cpu_to_le32(~crc);
  
  	if (skb_is_nonlinear(skb)) {
  		kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ);
  		cp = NULL;
  	}
  
  	/* adjust skb network/transport offsets to match mac/fcoe/port */
  	skb_push(skb, elen + hlen);
  	skb_reset_mac_header(skb);
  	skb_reset_network_header(skb);
  	skb->mac_len = elen;
  	skb->protocol = htons(ETH_P_FCOE);
  	skb->dev = fcoe->netdev;
  
  	/* fill up mac and fcoe headers */
  	eh = eth_hdr(skb);
  	eh->h_proto = htons(ETH_P_FCOE);
  	if (fcoe->ctlr.map_dest)
  		fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id);
  	else
  		/* insert GW address */
  		memcpy(eh->h_dest, fcoe->ctlr.dest_addr, ETH_ALEN);
  
  	if (unlikely(fcoe->ctlr.flogi_oxid != FC_XID_UNKNOWN))
  		memcpy(eh->h_source, fcoe->ctlr.ctl_src_addr, ETH_ALEN);
  	else
  		memcpy(eh->h_source, port->data_src_addr, ETH_ALEN);
  
  	hp = (struct fcoe_hdr *)(eh + 1);
  	memset(hp, 0, sizeof(*hp));
  	if (FC_FCOE_VER)
  		FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
  	hp->fcoe_sof = sof;
  
  	/* fcoe lso, mss is in max_payload which is non-zero for FCP data */
  	if (lport->seq_offload && fr_max_payload(fp)) {
  		skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
  		skb_shinfo(skb)->gso_size = fr_max_payload(fp);
  	} else {
  		skb_shinfo(skb)->gso_type = 0;
  		skb_shinfo(skb)->gso_size = 0;
  	}
  	/* update tx stats: regardless if LLD fails */
  	stats = per_cpu_ptr(lport->dev_stats, get_cpu());
  	stats->TxFrames++;
  	stats->TxWords += wlen;
  	put_cpu();
  
  	/* send down to lld */
  	fr_dev(fp) = lport;
  	if (port->fcoe_pending_queue.qlen)
  		fcoe_check_wait_queue(lport, skb);
  	else if (fcoe_start_io(skb))
  		fcoe_check_wait_queue(lport, skb);
  
  	return 0;
  }
  
  /**
   * fcoe_percpu_flush_done() - Indicate per-CPU queue flush completion
   * @skb: The completed skb (argument required by destructor)
   */
  static void fcoe_percpu_flush_done(struct sk_buff *skb)
  {
  	complete(&fcoe_flush_completion);
  }
  
  /**
   * fcoe_recv_frame() - process a single received frame
   * @skb: frame to process
   */
  static void fcoe_recv_frame(struct sk_buff *skb)
  {
  	u32 fr_len;
  	struct fc_lport *lport;
  	struct fcoe_rcv_info *fr;
  	struct fcoe_dev_stats *stats;
  	struct fc_frame_header *fh;
  	struct fcoe_crc_eof crc_eof;
  	struct fc_frame *fp;
  	struct fcoe_port *port;
  	struct fcoe_hdr *hp;
  
  	fr = fcoe_dev_from_skb(skb);
  	lport = fr->fr_dev;
  	if (unlikely(!lport)) {
  		if (skb->destructor != fcoe_percpu_flush_done)
  			FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb");
  		kfree_skb(skb);
  		return;
  	}
  
  	FCOE_NETDEV_DBG(skb->dev, "skb_info: len:%d data_len:%d "
  			"head:%p data:%p tail:%p end:%p sum:%d dev:%s",
  			skb->len, skb->data_len,
  			skb->head, skb->data, skb_tail_pointer(skb),
  			skb_end_pointer(skb), skb->csum,
  			skb->dev ? skb->dev->name : "<NULL>");
  
  	port = lport_priv(lport);
  	if (skb_is_nonlinear(skb))
  		skb_linearize(skb);	/* not ideal */
  
  	/*
  	 * Frame length checks and setting up the header pointers
  	 * was done in fcoe_rcv already.
  	 */
  	hp = (struct fcoe_hdr *) skb_network_header(skb);
  	fh = (struct fc_frame_header *) skb_transport_header(skb);
  
  	stats = per_cpu_ptr(lport->dev_stats, get_cpu());
  	if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
  		if (stats->ErrorFrames < 5)
  			printk(KERN_WARNING "fcoe: FCoE version "
  			       "mismatch: The frame has "
  			       "version %x, but the "
  			       "initiator supports version "
  			       "%x\n", FC_FCOE_DECAPS_VER(hp),
  			       FC_FCOE_VER);
  		goto drop;
  	}
  
  	skb_pull(skb, sizeof(struct fcoe_hdr));
  	fr_len = skb->len - sizeof(struct fcoe_crc_eof);
  
  	stats->RxFrames++;
  	stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
  
  	fp = (struct fc_frame *)skb;
  	fc_frame_init(fp);
  	fr_dev(fp) = lport;
  	fr_sof(fp) = hp->fcoe_sof;
  
  	/* Copy out the CRC and EOF trailer for access */
  	if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof)))
  		goto drop;
  	fr_eof(fp) = crc_eof.fcoe_eof;
  	fr_crc(fp) = crc_eof.fcoe_crc32;
  	if (pskb_trim(skb, fr_len))
  		goto drop;
  
  	/*
  	 * We only check CRC if no offload is available and if it is
  	 * it's solicited data, in which case, the FCP layer would
  	 * check it during the copy.
  	 */
  	if (lport->crc_offload &&
  	    skb->ip_summed == CHECKSUM_UNNECESSARY)
  		fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
  	else
  		fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
  
  	fh = fc_frame_header_get(fp);
  	if ((fh->fh_r_ctl != FC_RCTL_DD_SOL_DATA ||
  	    fh->fh_type != FC_TYPE_FCP) &&
  	    (fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
  		if (le32_to_cpu(fr_crc(fp)) !=
  		    ~crc32(~0, skb->data, fr_len)) {
  			if (stats->InvalidCRCCount < 5)
  				printk(KERN_WARNING "fcoe: dropping "
  				       "frame with CRC error\n");
  			stats->InvalidCRCCount++;
  			goto drop;
  		}
  		fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
  	}
  	put_cpu();
  	fc_exch_recv(lport, fp);
  	return;
  
  drop:
  	stats->ErrorFrames++;
  	put_cpu();
  	kfree_skb(skb);
  }
  
  /**
   * fcoe_percpu_receive_thread() - The per-CPU packet receive thread
   * @arg: The per-CPU context
   *
   * Return: 0 for success
   */
  int fcoe_percpu_receive_thread(void *arg)
  {
  	struct fcoe_percpu_s *p = arg;
  	struct sk_buff *skb;
  
  	set_user_nice(current, -20);
  
  	while (!kthread_should_stop()) {
  
  		spin_lock_bh(&p->fcoe_rx_list.lock);
  		while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) {
  			set_current_state(TASK_INTERRUPTIBLE);
  			spin_unlock_bh(&p->fcoe_rx_list.lock);
  			schedule();
  			set_current_state(TASK_RUNNING);
  			if (kthread_should_stop())
  				return 0;
  			spin_lock_bh(&p->fcoe_rx_list.lock);
  		}
  		spin_unlock_bh(&p->fcoe_rx_list.lock);
  		fcoe_recv_frame(skb);
  	}
  	return 0;
  }
  
  /**
   * fcoe_check_wait_queue() - Attempt to clear the transmit backlog
   * @lport: The local port whose backlog is to be cleared
   *
   * This empties the wait_queue, dequeues the head of the wait_queue queue
   * and calls fcoe_start_io() for each packet. If all skb have been
   * transmitted it returns the qlen. If an error occurs it restores
   * wait_queue (to try again later) and returns -1.
   *
   * The wait_queue is used when the skb transmit fails. The failed skb
   * will go in the wait_queue which will be emptied by the timer function or
   * by the next skb transmit.
   */
  static void fcoe_check_wait_queue(struct fc_lport *lport, struct sk_buff *skb)
  {
  	struct fcoe_port *port = lport_priv(lport);
  	int rc;
  
  	spin_lock_bh(&port->fcoe_pending_queue.lock);
  
  	if (skb)
  		__skb_queue_tail(&port->fcoe_pending_queue, skb);
  
  	if (port->fcoe_pending_queue_active)
  		goto out;
  	port->fcoe_pending_queue_active = 1;
  
  	while (port->fcoe_pending_queue.qlen) {
  		/* keep qlen > 0 until fcoe_start_io succeeds */
  		port->fcoe_pending_queue.qlen++;
  		skb = __skb_dequeue(&port->fcoe_pending_queue);
  
  		spin_unlock_bh(&port->fcoe_pending_queue.lock);
  		rc = fcoe_start_io(skb);
  		spin_lock_bh(&port->fcoe_pending_queue.lock);
  
  		if (rc) {
  			__skb_queue_head(&port->fcoe_pending_queue, skb);
  			/* undo temporary increment above */
  			port->fcoe_pending_queue.qlen--;
  			break;
  		}
  		/* undo temporary increment above */
  		port->fcoe_pending_queue.qlen--;
  	}
  
  	if (port->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH)
  		lport->qfull = 0;
  	if (port->fcoe_pending_queue.qlen && !timer_pending(&port->timer))
  		mod_timer(&port->timer, jiffies + 2);
  	port->fcoe_pending_queue_active = 0;
  out:
  	if (port->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
  		lport->qfull = 1;
  	spin_unlock_bh(&port->fcoe_pending_queue.lock);
  	return;
  }
  
  /**
   * fcoe_dev_setup() - Setup the link change notification interface
   */
  static void fcoe_dev_setup(void)
  {
  	register_netdevice_notifier(&fcoe_notifier);
  }
  
  /**
   * fcoe_dev_cleanup() - Cleanup the link change notification interface
   */
  static void fcoe_dev_cleanup(void)
  {
  	unregister_netdevice_notifier(&fcoe_notifier);
  }
  
  /**
   * fcoe_device_notification() - Handler for net device events
   * @notifier: The context of the notification
   * @event:    The type of event
   * @ptr:      The net device that the event was on
   *
   * This function is called by the Ethernet driver in case of link change event.
   *
   * Returns: 0 for success
   */
  static int fcoe_device_notification(struct notifier_block *notifier,
  				    ulong event, void *ptr)
  {
  	struct fc_lport *lport = NULL;
  	struct net_device *netdev = ptr;
  	struct fcoe_interface *fcoe;
  	struct fcoe_port *port;
  	struct fcoe_dev_stats *stats;
  	u32 link_possible = 1;
  	u32 mfs;
  	int rc = NOTIFY_OK;
  
  	list_for_each_entry(fcoe, &fcoe_hostlist, list) {
  		if (fcoe->netdev == netdev) {
  			lport = fcoe->ctlr.lp;
  			break;
  		}
  	}
  	if (!lport) {
  		rc = NOTIFY_DONE;
  		goto out;
  	}
  
  	switch (event) {
  	case NETDEV_DOWN:
  	case NETDEV_GOING_DOWN:
  		link_possible = 0;
  		break;
  	case NETDEV_UP:
  	case NETDEV_CHANGE:
  		break;
  	case NETDEV_CHANGEMTU:
  		if (netdev->features & NETIF_F_FCOE_MTU)
  			break;
  		mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
  				     sizeof(struct fcoe_crc_eof));
  		if (mfs >= FC_MIN_MAX_FRAME)
  			fc_set_mfs(lport, mfs);
  		break;
  	case NETDEV_REGISTER:
  		break;
  	case NETDEV_UNREGISTER:
  		list_del(&fcoe->list);
  		port = lport_priv(fcoe->ctlr.lp);
  		fcoe_interface_cleanup(fcoe);
  		schedule_work(&port->destroy_work);
  		goto out;
  		break;
  	default:
  		FCOE_NETDEV_DBG(netdev, "Unknown event %ld "
  				"from netdev netlink\n", event);
  	}
  
  	fcoe_link_speed_update(lport);
  
  	if (link_possible && !fcoe_link_ok(lport))
  		fcoe_ctlr_link_up(&fcoe->ctlr);
  	else if (fcoe_ctlr_link_down(&fcoe->ctlr)) {
  		stats = per_cpu_ptr(lport->dev_stats, get_cpu());
  		stats->LinkFailureCount++;
  		put_cpu();
  		fcoe_clean_pending_queue(lport);
  	}
  out:
  	return rc;
  }
  
  /**
   * fcoe_if_to_netdev() - Parse a name buffer to get a net device
   * @buffer: The name of the net device
   *
   * Returns: NULL or a ptr to net_device
   */
  static struct net_device *fcoe_if_to_netdev(const char *buffer)
  {
  	char *cp;
  	char ifname[IFNAMSIZ + 2];
  
  	if (buffer) {
  		strlcpy(ifname, buffer, IFNAMSIZ);
  		cp = ifname + strlen(ifname);
  		while (--cp >= ifname && *cp == '\n')
  			*cp = '\0';
  		return dev_get_by_name(&init_net, ifname);
  	}
  	return NULL;
  }
  
  /**
   * fcoe_disable() - Disables a FCoE interface
   * @buffer: The name of the Ethernet interface to be disabled
   * @kp:	    The associated kernel parameter
   *
   * Called from sysfs.
   *
   * Returns: 0 for success
   */
  static int fcoe_disable(const char *buffer, struct kernel_param *kp)
  {
  	struct fcoe_interface *fcoe;
  	struct net_device *netdev;
  	int rc = 0;
  
  	mutex_lock(&fcoe_config_mutex);
  #ifdef CONFIG_FCOE_MODULE
  	/*
  	 * Make sure the module has been initialized, and is not about to be
  	 * removed.  Module paramter sysfs files are writable before the
  	 * module_init function is called and after module_exit.
  	 */
  	if (THIS_MODULE->state != MODULE_STATE_LIVE) {
  		rc = -ENODEV;
  		goto out_nodev;
  	}
  #endif
  
  	netdev = fcoe_if_to_netdev(buffer);
  	if (!netdev) {
  		rc = -ENODEV;
  		goto out_nodev;
  	}
  
  	if (!rtnl_trylock()) {
  		dev_put(netdev);
  		mutex_unlock(&fcoe_config_mutex);
  		return restart_syscall();
  	}
  
  	fcoe = fcoe_hostlist_lookup_port(netdev);
  	rtnl_unlock();
  
  	if (fcoe) {
  		fc_fabric_logoff(fcoe->ctlr.lp);
  		fcoe_ctlr_link_down(&fcoe->ctlr);
  	} else
  		rc = -ENODEV;
  
  	dev_put(netdev);
  out_nodev:
  	mutex_unlock(&fcoe_config_mutex);
  	return rc;
  }
  
  /**
   * fcoe_enable() - Enables a FCoE interface
   * @buffer: The name of the Ethernet interface to be enabled
   * @kp:     The associated kernel parameter
   *
   * Called from sysfs.
   *
   * Returns: 0 for success
   */
  static int fcoe_enable(const char *buffer, struct kernel_param *kp)
  {
  	struct fcoe_interface *fcoe;
  	struct net_device *netdev;
  	int rc = 0;
  
  	mutex_lock(&fcoe_config_mutex);
  #ifdef CONFIG_FCOE_MODULE
  	/*
  	 * Make sure the module has been initialized, and is not about to be
  	 * removed.  Module paramter sysfs files are writable before the
  	 * module_init function is called and after module_exit.
  	 */
  	if (THIS_MODULE->state != MODULE_STATE_LIVE) {
  		rc = -ENODEV;
  		goto out_nodev;
  	}
  #endif
  
  	netdev = fcoe_if_to_netdev(buffer);
  	if (!netdev) {
  		rc = -ENODEV;
  		goto out_nodev;
  	}
  
  	if (!rtnl_trylock()) {
  		dev_put(netdev);
  		mutex_unlock(&fcoe_config_mutex);
  		return restart_syscall();
  	}
  
  	fcoe = fcoe_hostlist_lookup_port(netdev);
  	rtnl_unlock();
  
  	if (fcoe) {
  		if (!fcoe_link_ok(fcoe->ctlr.lp))
  			fcoe_ctlr_link_up(&fcoe->ctlr);
  		rc = fc_fabric_login(fcoe->ctlr.lp);
  	} else
  		rc = -ENODEV;
  
  	dev_put(netdev);
  out_nodev:
  	mutex_unlock(&fcoe_config_mutex);
  	return rc;
  }
  
  /**
   * fcoe_destroy() - Destroy a FCoE interface
   * @buffer: The name of the Ethernet interface to be destroyed
   * @kp:	    The associated kernel parameter
   *
   * Called from sysfs.
   *
   * Returns: 0 for success
   */
  static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
  {
  	struct fcoe_interface *fcoe;
  	struct net_device *netdev;
  	int rc = 0;
  
  	mutex_lock(&fcoe_config_mutex);
  #ifdef CONFIG_FCOE_MODULE
  	/*
  	 * Make sure the module has been initialized, and is not about to be
  	 * removed.  Module paramter sysfs files are writable before the
  	 * module_init function is called and after module_exit.
  	 */
  	if (THIS_MODULE->state != MODULE_STATE_LIVE) {
  		rc = -ENODEV;
  		goto out_nodev;
  	}
  #endif
  
  	netdev = fcoe_if_to_netdev(buffer);
  	if (!netdev) {
  		rc = -ENODEV;
  		goto out_nodev;
  	}
  
  	if (!rtnl_trylock()) {
  		dev_put(netdev);
  		mutex_unlock(&fcoe_config_mutex);
  		return restart_syscall();
  	}
  
  	fcoe = fcoe_hostlist_lookup_port(netdev);
  	if (!fcoe) {
  		rtnl_unlock();
  		rc = -ENODEV;
  		goto out_putdev;
  	}
  	list_del(&fcoe->list);
  	fcoe_interface_cleanup(fcoe);
  	/* RTNL mutex is dropped by fcoe_if_destroy */
  	fcoe_if_destroy(fcoe->ctlr.lp);
  
  out_putdev:
  	dev_put(netdev);
  out_nodev:
  	mutex_unlock(&fcoe_config_mutex);
  	return rc;
  }
  
  /**
   * fcoe_destroy_work() - Destroy a FCoE port in a deferred work context
   * @work: Handle to the FCoE port to be destroyed
   */
  static void fcoe_destroy_work(struct work_struct *work)
  {
  	struct fcoe_port *port;
  
  	port = container_of(work, struct fcoe_port, destroy_work);
  	mutex_lock(&fcoe_config_mutex);
  	rtnl_lock();
  	/* RTNL mutex is dropped by fcoe_if_destroy */
  	fcoe_if_destroy(port->lport);
  	mutex_unlock(&fcoe_config_mutex);
  }
  
  /**
   * fcoe_create() - Create a fcoe interface
   * @buffer: The name of the Ethernet interface to create on
   * @kp:	    The associated kernel param
   *
   * Called from sysfs.
   *
   * Returns: 0 for success
   */
  static int fcoe_create(const char *buffer, struct kernel_param *kp)
  {
  	int rc;
  	struct fcoe_interface *fcoe;
  	struct fc_lport *lport;
  	struct net_device *netdev;
  
  	mutex_lock(&fcoe_config_mutex);
  
  	if (!rtnl_trylock()) {
  		mutex_unlock(&fcoe_config_mutex);
  		return restart_syscall();
  	}
  
  #ifdef CONFIG_FCOE_MODULE
  	/*
  	 * Make sure the module has been initialized, and is not about to be
  	 * removed.  Module paramter sysfs files are writable before the
  	 * module_init function is called and after module_exit.
  	 */
  	if (THIS_MODULE->state != MODULE_STATE_LIVE) {
  		rc = -ENODEV;
  		goto out_nomod;
  	}
  #endif
  
  	if (!try_module_get(THIS_MODULE)) {
  		rc = -EINVAL;
  		goto out_nomod;
  	}
  
  	netdev = fcoe_if_to_netdev(buffer);
  	if (!netdev) {
  		rc = -ENODEV;
  		goto out_nodev;
  	}
  
  	/* look for existing lport */
  	if (fcoe_hostlist_lookup(netdev)) {
  		rc = -EEXIST;
  		goto out_putdev;
  	}
  
  	fcoe = fcoe_interface_create(netdev);
  	if (!fcoe) {
  		rc = -ENOMEM;
  		goto out_putdev;
  	}
  
  	lport = fcoe_if_create(fcoe, &netdev->dev, 0);
  	if (IS_ERR(lport)) {
  		printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
  		       netdev->name);
  		rc = -EIO;
  		fcoe_interface_cleanup(fcoe);
  		goto out_free;
  	}
  
  	/* Make this the "master" N_Port */
  	fcoe->ctlr.lp = lport;
  
  	/* add to lports list */
  	fcoe_hostlist_add(lport);
  
  	/* start FIP Discovery and FLOGI */
  	lport->boot_time = jiffies;
  	fc_fabric_login(lport);
  	if (!fcoe_link_ok(lport))
  		fcoe_ctlr_link_up(&fcoe->ctlr);
  
  	/*
  	 * Release from init in fcoe_interface_create(), on success lport
  	 * should be holding a reference taken in fcoe_if_create().
  	 */
  	fcoe_interface_put(fcoe);
  	dev_put(netdev);
  	rtnl_unlock();
  	mutex_unlock(&fcoe_config_mutex);
  
  	return 0;
  out_free:
  	fcoe_interface_put(fcoe);
  out_putdev:
  	dev_put(netdev);
  out_nodev:
  	module_put(THIS_MODULE);
  out_nomod:
  	rtnl_unlock();
  	mutex_unlock(&fcoe_config_mutex);
  	return rc;
  }
  
  /**
   * fcoe_link_speed_update() - Update the supported and actual link speeds
   * @lport: The local port to update speeds for
   *
   * Returns: 0 if the ethtool query was successful
   *          -1 if the ethtool query failed
   */
  int fcoe_link_speed_update(struct fc_lport *lport)
  {
  	struct fcoe_port *port = lport_priv(lport);
  	struct net_device *netdev = port->fcoe->netdev;
  	struct ethtool_cmd ecmd = { ETHTOOL_GSET };
  
  	if (!dev_ethtool_get_settings(netdev, &ecmd)) {
  		lport->link_supported_speeds &=
  			~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
  		if (ecmd.supported & (SUPPORTED_1000baseT_Half |
  				      SUPPORTED_1000baseT_Full))
  			lport->link_supported_speeds |= FC_PORTSPEED_1GBIT;
  		if (ecmd.supported & SUPPORTED_10000baseT_Full)
  			lport->link_supported_speeds |=
  				FC_PORTSPEED_10GBIT;
  		if (ecmd.speed == SPEED_1000)
  			lport->link_speed = FC_PORTSPEED_1GBIT;
  		if (ecmd.speed == SPEED_10000)
  			lport->link_speed = FC_PORTSPEED_10GBIT;
  
  		return 0;
  	}
  	return -1;
  }
  
  /**
   * fcoe_link_ok() - Check if the link is OK for a local port
   * @lport: The local port to check link on
   *
   * Returns: 0 if link is UP and OK, -1 if not
   *
   */
  int fcoe_link_ok(struct fc_lport *lport)
  {
  	struct fcoe_port *port = lport_priv(lport);
  	struct net_device *netdev = port->fcoe->netdev;
  
  	if (netif_oper_up(netdev))
  		return 0;
  	return -1;
  }
  
  /**
   * fcoe_percpu_clean() - Clear all pending skbs for an local port
   * @lport: The local port whose skbs are to be cleared
   *
   * Must be called with fcoe_create_mutex held to single-thread completion.
   *
   * This flushes the pending skbs by adding a new skb to each queue and
   * waiting until they are all freed.  This assures us that not only are
   * there no packets that will be handled by the lport, but also that any
   * threads already handling packet have returned.
   */
  void fcoe_percpu_clean(struct fc_lport *lport)
  {
  	struct fcoe_percpu_s *pp;
  	struct fcoe_rcv_info *fr;
  	struct sk_buff_head *list;
  	struct sk_buff *skb, *next;
  	struct sk_buff *head;
  	unsigned int cpu;
  
  	for_each_possible_cpu(cpu) {
  		pp = &per_cpu(fcoe_percpu, cpu);
  		spin_lock_bh(&pp->fcoe_rx_list.lock);
  		list = &pp->fcoe_rx_list;
  		head = list->next;
  		for (skb = head; skb != (struct sk_buff *)list;
  		     skb = next) {
  			next = skb->next;
  			fr = fcoe_dev_from_skb(skb);
  			if (fr->fr_dev == lport) {
  				__skb_unlink(skb, list);
  				kfree_skb(skb);
  			}
  		}
  
  		if (!pp->thread || !cpu_online(cpu)) {
  			spin_unlock_bh(&pp->fcoe_rx_list.lock);
  			continue;
  		}
  
  		skb = dev_alloc_skb(0);
  		if (!skb) {
  			spin_unlock_bh(&pp->fcoe_rx_list.lock);
  			continue;
  		}
  		skb->destructor = fcoe_percpu_flush_done;
  
  		__skb_queue_tail(&pp->fcoe_rx_list, skb);
  		if (pp->fcoe_rx_list.qlen == 1)
  			wake_up_process(pp->thread);
  		spin_unlock_bh(&pp->fcoe_rx_list.lock);
  
  		wait_for_completion(&fcoe_flush_completion);
  	}
  }
  
  /**
   * fcoe_clean_pending_queue() - Dequeue a skb and free it
   * @lport: The local port to dequeue a skb on
   */
  void fcoe_clean_pending_queue(struct fc_lport *lport)
  {
  	struct fcoe_port  *port = lport_priv(lport);
  	struct sk_buff *skb;
  
  	spin_lock_bh(&port->fcoe_pending_queue.lock);
  	while ((skb = __skb_dequeue(&port->fcoe_pending_queue)) != NULL) {
  		spin_unlock_bh(&port->fcoe_pending_queue.lock);
  		kfree_skb(skb);
  		spin_lock_bh(&port->fcoe_pending_queue.lock);
  	}
  	spin_unlock_bh(&port->fcoe_pending_queue.lock);
  }
  
  /**
   * fcoe_reset() - Reset a local port
   * @shost: The SCSI host associated with the local port to be reset
   *
   * Returns: Always 0 (return value required by FC transport template)
   */
  int fcoe_reset(struct Scsi_Host *shost)
  {
  	struct fc_lport *lport = shost_priv(shost);
  	fc_lport_reset(lport);
  	return 0;
  }
  
  /**
   * fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device
   * @netdev: The net device used as a key
   *
   * Locking: Must be called with the RNL mutex held.
   *
   * Returns: NULL or the FCoE interface
   */
  static struct fcoe_interface *
  fcoe_hostlist_lookup_port(const struct net_device *netdev)
  {
  	struct fcoe_interface *fcoe;
  
  	list_for_each_entry(fcoe, &fcoe_hostlist, list) {
  		if (fcoe->netdev == netdev)
  			return fcoe;
  	}
  	return NULL;
  }
  
  /**
   * fcoe_hostlist_lookup() - Find the local port associated with a
   *			    given net device
   * @netdev: The netdevice used as a key
   *
   * Locking: Must be called with the RTNL mutex held
   *
   * Returns: NULL or the local port
   */
  static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
  {
  	struct fcoe_interface *fcoe;
  
  	fcoe = fcoe_hostlist_lookup_port(netdev);
  	return (fcoe) ? fcoe->ctlr.lp : NULL;
  }
  
  /**
   * fcoe_hostlist_add() - Add the FCoE interface identified by a local
   *			 port to the hostlist
   * @lport: The local port that identifies the FCoE interface to be added
   *
   * Locking: must be called with the RTNL mutex held
   *
   * Returns: 0 for success
   */
  static int fcoe_hostlist_add(const struct fc_lport *lport)
  {
  	struct fcoe_interface *fcoe;
  	struct fcoe_port *port;
  
  	fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
  	if (!fcoe) {
  		port = lport_priv(lport);
  		fcoe = port->fcoe;
  		list_add_tail(&fcoe->list, &fcoe_hostlist);
  	}
  	return 0;
  }
  
  /**
   * fcoe_init() - Initialize fcoe.ko
   *
   * Returns: 0 on success, or a negative value on failure
   */
  static int __init fcoe_init(void)
  {
  	struct fcoe_percpu_s *p;
  	unsigned int cpu;
  	int rc = 0;
  
  	mutex_lock(&fcoe_config_mutex);
  
  	for_each_possible_cpu(cpu) {
  		p = &per_cpu(fcoe_percpu, cpu);
  		skb_queue_head_init(&p->fcoe_rx_list);
  	}
  
  	for_each_online_cpu(cpu)
  		fcoe_percpu_thread_create(cpu);
  
  	/* Initialize per CPU interrupt thread */
  	rc = register_hotcpu_notifier(&fcoe_cpu_notifier);
  	if (rc)
  		goto out_free;
  
  	/* Setup link change notification */
  	fcoe_dev_setup();
  
  	rc = fcoe_if_init();
  	if (rc)
  		goto out_free;
  
  	mutex_unlock(&fcoe_config_mutex);
  	return 0;
  
  out_free:
  	for_each_online_cpu(cpu) {
  		fcoe_percpu_thread_destroy(cpu);
  	}
  	mutex_unlock(&fcoe_config_mutex);
  	return rc;
  }
  module_init(fcoe_init);
  
  /**
   * fcoe_exit() - Clean up fcoe.ko
   *
   * Returns: 0 on success or a  negative value on failure
   */
  static void __exit fcoe_exit(void)
  {
  	struct fcoe_interface *fcoe, *tmp;
  	struct fcoe_port *port;
  	unsigned int cpu;
  
  	mutex_lock(&fcoe_config_mutex);
  
  	fcoe_dev_cleanup();
  
  	/* releases the associated fcoe hosts */
  	rtnl_lock();
  	list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) {
  		list_del(&fcoe->list);
  		port = lport_priv(fcoe->ctlr.lp);
  		fcoe_interface_cleanup(fcoe);
  		schedule_work(&port->destroy_work);
  	}
  	rtnl_unlock();
  
  	unregister_hotcpu_notifier(&fcoe_cpu_notifier);
  
  	for_each_online_cpu(cpu)
  		fcoe_percpu_thread_destroy(cpu);
  
  	mutex_unlock(&fcoe_config_mutex);
  
  	/* flush any asyncronous interface destroys,
  	 * this should happen after the netdev notifier is unregistered */
  	flush_scheduled_work();
  	/* That will flush out all the N_Ports on the hostlist, but now we
  	 * may have NPIV VN_Ports scheduled for destruction */
  	flush_scheduled_work();
  
  	/* detach from scsi transport
  	 * must happen after all destroys are done, therefor after the flush */
  	fcoe_if_exit();
  }
  module_exit(fcoe_exit);
  
  /**
   * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler
   * @seq: active sequence in the FLOGI or FDISC exchange
   * @fp: response frame, or error encoded in a pointer (timeout)
   * @arg: pointer the the fcoe_ctlr structure
   *
   * This handles MAC address managment for FCoE, then passes control on to
   * the libfc FLOGI response handler.
   */
  static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
  {
  	struct fcoe_ctlr *fip = arg;
  	struct fc_exch *exch = fc_seq_exch(seq);
  	struct fc_lport *lport = exch->lp;
  	u8 *mac;
  
  	if (IS_ERR(fp))
  		goto done;
  
  	mac = fr_cb(fp)->granted_mac;
  	if (is_zero_ether_addr(mac)) {
  		/* pre-FIP */
  		if (fcoe_ctlr_recv_flogi(fip, lport, fp)) {
  			fc_frame_free(fp);
  			return;
  		}
  	}
  	fcoe_update_src_mac(lport, mac);
  done:
  	fc_lport_flogi_resp(seq, fp, lport);
  }
  
  /**
   * fcoe_logo_resp() - FCoE specific LOGO response handler
   * @seq: active sequence in the LOGO exchange
   * @fp: response frame, or error encoded in a pointer (timeout)
   * @arg: pointer the the fcoe_ctlr structure
   *
   * This handles MAC address managment for FCoE, then passes control on to
   * the libfc LOGO response handler.
   */
  static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
  {
  	struct fc_lport *lport = arg;
  	static u8 zero_mac[ETH_ALEN] = { 0 };
  
  	if (!IS_ERR(fp))
  		fcoe_update_src_mac(lport, zero_mac);
  	fc_lport_logo_resp(seq, fp, lport);
  }
  
  /**
   * fcoe_elsct_send - FCoE specific ELS handler
   *
   * This does special case handling of FIP encapsualted ELS exchanges for FCoE,
   * using FCoE specific response handlers and passing the FIP controller as
   * the argument (the lport is still available from the exchange).
   *
   * Most of the work here is just handed off to the libfc routine.
   */
  static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did,
  				      struct fc_frame *fp, unsigned int op,
  				      void (*resp)(struct fc_seq *,
  						   struct fc_frame *,
  						   void *),
  				      void *arg, u32 timeout)
  {
  	struct fcoe_port *port = lport_priv(lport);
  	struct fcoe_interface *fcoe = port->fcoe;
  	struct fcoe_ctlr *fip = &fcoe->ctlr;
  	struct fc_frame_header *fh = fc_frame_header_get(fp);
  
  	switch (op) {
  	case ELS_FLOGI:
  	case ELS_FDISC:
  		return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp,
  				     fip, timeout);
  	case ELS_LOGO:
  		/* only hook onto fabric logouts, not port logouts */
  		if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
  			break;
  		return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp,
  				     lport, timeout);
  	}
  	return fc_elsct_send(lport, did, fp, op, resp, arg, timeout);
  }
  
  /**
   * fcoe_vport_create() - create an fc_host/scsi_host for a vport
   * @vport: fc_vport object to create a new fc_host for
   * @disabled: start the new fc_host in a disabled state by default?
   *
   * Returns: 0 for success
   */
  static int fcoe_vport_create(struct fc_vport *vport, bool disabled)
  {
  	struct Scsi_Host *shost = vport_to_shost(vport);
  	struct fc_lport *n_port = shost_priv(shost);
  	struct fcoe_port *port = lport_priv(n_port);
  	struct fcoe_interface *fcoe = port->fcoe;
  	struct net_device *netdev = fcoe->netdev;
  	struct fc_lport *vn_port;
  
  	mutex_lock(&fcoe_config_mutex);
  	vn_port = fcoe_if_create(fcoe, &vport->dev, 1);
  	mutex_unlock(&fcoe_config_mutex);
  
  	if (IS_ERR(vn_port)) {
  		printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n",
  		       netdev->name);
  		return -EIO;
  	}
  
  	if (disabled) {
  		fc_vport_set_state(vport, FC_VPORT_DISABLED);
  	} else {
  		vn_port->boot_time = jiffies;
  		fc_fabric_login(vn_port);
  		fc_vport_setlink(vn_port);
  	}
  	return 0;
  }
  
  /**
   * fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport
   * @vport: fc_vport object that is being destroyed
   *
   * Returns: 0 for success
   */
  static int fcoe_vport_destroy(struct fc_vport *vport)
  {
  	struct Scsi_Host *shost = vport_to_shost(vport);
  	struct fc_lport *n_port = shost_priv(shost);
  	struct fc_lport *vn_port = vport->dd_data;
  	struct fcoe_port *port = lport_priv(vn_port);
  
  	mutex_lock(&n_port->lp_mutex);
  	list_del(&vn_port->list);
  	mutex_unlock(&n_port->lp_mutex);
  	schedule_work(&port->destroy_work);
  	return 0;
  }
  
  /**
   * fcoe_vport_disable() - change vport state
   * @vport: vport to bring online/offline
   * @disable: should the vport be disabled?
   */
  static int fcoe_vport_disable(struct fc_vport *vport, bool disable)
  {
  	struct fc_lport *lport = vport->dd_data;
  
  	if (disable) {
  		fc_vport_set_state(vport, FC_VPORT_DISABLED);
  		fc_fabric_logoff(lport);
  	} else {
  		lport->boot_time = jiffies;
  		fc_fabric_login(lport);
  		fc_vport_setlink(lport);
  	}
  
  	return 0;
  }
  
  /**
   * fcoe_vport_set_symbolic_name() - append vport string to symbolic name
   * @vport: fc_vport with a new symbolic name string
   *
   * After generating a new symbolic name string, a new RSPN_ID request is
   * sent to the name server.  There is no response handler, so if it fails
   * for some reason it will not be retried.
   */
  static void fcoe_set_vport_symbolic_name(struct fc_vport *vport)
  {
  	struct fc_lport *lport = vport->dd_data;
  	struct fc_frame *fp;
  	size_t len;
  
  	snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
  		 "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION,
  		 fcoe_netdev(lport)->name, vport->symbolic_name);
  
  	if (lport->state != LPORT_ST_READY)
  		return;
  
  	len = strnlen(fc_host_symbolic_name(lport->host), 255);
  	fp = fc_frame_alloc(lport,
  			    sizeof(struct fc_ct_hdr) +
  			    sizeof(struct fc_ns_rspn) + len);
  	if (!fp)
  		return;
  	lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID,
  			     NULL, NULL, 3 * lport->r_a_tov);
  }
  
  /**
   * fcoe_get_lesb() - Fill the FCoE Link Error Status Block
   * @lport: the local port
   * @fc_lesb: the link error status block
   */
  static void fcoe_get_lesb(struct fc_lport *lport,
  			 struct fc_els_lesb *fc_lesb)
  {
  	unsigned int cpu;
  	u32 lfc, vlfc, mdac;
  	struct fcoe_dev_stats *devst;
  	struct fcoe_fc_els_lesb *lesb;
  	struct net_device *netdev = fcoe_netdev(lport);
  
  	lfc = 0;
  	vlfc = 0;
  	mdac = 0;
  	lesb = (struct fcoe_fc_els_lesb *)fc_lesb;
  	memset(lesb, 0, sizeof(*lesb));
  	for_each_possible_cpu(cpu) {
  		devst = per_cpu_ptr(lport->dev_stats, cpu);
  		lfc += devst->LinkFailureCount;
  		vlfc += devst->VLinkFailureCount;
  		mdac += devst->MissDiscAdvCount;
  	}
  	lesb->lesb_link_fail = htonl(lfc);
  	lesb->lesb_vlink_fail = htonl(vlfc);
  	lesb->lesb_miss_fka = htonl(mdac);
  	lesb->lesb_fcs_error = htonl(dev_get_stats(netdev)->rx_crc_errors);
  }
  
  /**
   * fcoe_set_port_id() - Callback from libfc when Port_ID is set.
   * @lport: the local port
   * @port_id: the port ID
   * @fp: the received frame, if any, that caused the port_id to be set.
   *
   * This routine handles the case where we received a FLOGI and are
   * entering point-to-point mode.  We need to call fcoe_ctlr_recv_flogi()
   * so it can set the non-mapped mode and gateway address.
   *
   * The FLOGI LS_ACC is handled by fcoe_flogi_resp().
   */
  static void fcoe_set_port_id(struct fc_lport *lport,
  			     u32 port_id, struct fc_frame *fp)
  {
  	struct fcoe_port *port = lport_priv(lport);
  	struct fcoe_interface *fcoe = port->fcoe;
  
  	if (fp && fc_frame_payload_op(fp) == ELS_FLOGI)
  		fcoe_ctlr_recv_flogi(&fcoe->ctlr, lport, fp);
  }
  