drivers/scsi/fcoe/fcoe.c

/*
 * 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/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 <linux/workqueue.h>
#include <net/dcbnl.h>
#include <net/dcbevent.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/fc/fc_fcoe.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 = 4096;
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).");

unsigned int fcoe_debug_logging;
module_param_named(debug_logging, fcoe_debug_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");

static DEFINE_MUTEX(fcoe_config_mutex);

static struct workqueue_struct *fcoe_wq;

/* fcoe host list */
/* must only by accessed under the RTNL mutex */
static LIST_HEAD(fcoe_hostlist);
static 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 void fcoe_percpu_clean(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_hostlist_del(const struct fc_lport *);

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_ddp_target(struct fc_lport *, u16, struct scatterlist *,
			   unsigned int);
static int fcoe_dcb_app_notification(struct notifier_block *notifier,
				     ulong event, void *ptr);

static bool fcoe_match(struct net_device *netdev);
static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode);
static int fcoe_destroy(struct net_device *netdev);
static int fcoe_enable(struct net_device *netdev);
static int fcoe_disable(struct net_device *netdev);

/* fcoe_syfs control interface handlers */
static int fcoe_ctlr_alloc(struct net_device *netdev);
static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev);


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);

/* notification function for packets from net device */
static struct notifier_block fcoe_notifier = {
	.notifier_call = fcoe_device_notification,
};

/* notification function for DCB events */
static struct notifier_block dcb_notifier = {
	.notifier_call = fcoe_dcb_app_notification,
};

static struct scsi_transport_template *fcoe_nport_scsi_transport;
static struct scsi_transport_template *fcoe_vport_scsi_transport;

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 void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *);

static struct fcoe_sysfs_function_template fcoe_sysfs_templ = {
	.set_fcoe_ctlr_mode = fcoe_ctlr_set_fip_mode,
	.set_fcoe_ctlr_enabled = fcoe_ctlr_enabled,
	.get_fcoe_ctlr_link_fail = fcoe_ctlr_get_lesb,
	.get_fcoe_ctlr_vlink_fail = fcoe_ctlr_get_lesb,
	.get_fcoe_ctlr_miss_fka = fcoe_ctlr_get_lesb,
	.get_fcoe_ctlr_symb_err = fcoe_ctlr_get_lesb,
	.get_fcoe_ctlr_err_block = fcoe_ctlr_get_lesb,
	.get_fcoe_ctlr_fcs_error = fcoe_ctlr_get_lesb,

	.get_fcoe_fcf_selected = fcoe_fcf_get_selected,
	.get_fcoe_fcf_vlan_id = fcoe_fcf_get_vlan_id,
};

static struct libfc_function_template fcoe_libfc_fcn_templ = {
	.frame_send = fcoe_xmit,
	.ddp_setup = fcoe_ddp_setup,
	.ddp_done = fcoe_ddp_done,
	.ddp_target = fcoe_ddp_target,
	.elsct_send = fcoe_elsct_send,
	.get_lesb = fcoe_get_lesb,
	.lport_set_port_id = fcoe_set_port_id,
};

static struct fc_function_template fcoe_nport_fc_functions = {
	.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_serial_number = 1,
	.show_host_manufacturer = 1,
	.show_host_model = 1,
	.show_host_model_description = 1,
	.show_host_hardware_version = 1,
	.show_host_driver_version = 1,
	.show_host_firmware_version = 1,
	.show_host_optionrom_version = 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,
};

static struct fc_function_template fcoe_vport_fc_functions = {
	.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_serial_number = 1,
	.show_host_manufacturer = 1,
	.show_host_model = 1,
	.show_host_model_description = 1,
	.show_host_hardware_version = 1,
	.show_host_driver_version = 1,
	.show_host_firmware_version = 1,
	.show_host_optionrom_version = 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 = scsi_change_queue_depth,
	.this_id = -1,
	.cmd_per_lun = 3,
	.can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
	.use_clustering = ENABLE_CLUSTERING,
	.sg_tablesize = SG_ALL,
	.max_sectors = 0xffff,
	.track_queue_depth = 1,
};

/**
 * 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_to_ctlr(fcoe);
	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_BONDING && netdev->flags & IFF_MASTER) {
		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;
	fcoe->realdev = real_dev;
	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);
	if (fip->mode == FIP_MODE_VN2VN) {
		dev_mc_add(netdev, FIP_ALL_VN2VN_MACS);
		dev_mc_add(netdev, FIP_ALL_P2P_MACS);
	} else
		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 = 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
 * @fip_mode: The mode to use for FIP
 *
 * Returns: pointer to a struct fcoe_interface or NULL on error
 */
static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev,
						    enum fip_state fip_mode)
{
	struct fcoe_ctlr_device *ctlr_dev;
	struct fcoe_ctlr *ctlr;
	struct fcoe_interface *fcoe;
	int size;
	int err;

	if (!try_module_get(THIS_MODULE)) {
		FCOE_NETDEV_DBG(netdev,
				"Could not get a reference to the module\n");
		fcoe = ERR_PTR(-EBUSY);
		goto out;
	}

	size = sizeof(struct fcoe_ctlr) + sizeof(struct fcoe_interface);
	ctlr_dev = fcoe_ctlr_device_add(&netdev->dev, &fcoe_sysfs_templ,
					size);
	if (!ctlr_dev) {
		FCOE_DBG("Failed to add fcoe_ctlr_device\n");
		fcoe = ERR_PTR(-ENOMEM);
		goto out_putmod;
	}

	ctlr = fcoe_ctlr_device_priv(ctlr_dev);
	ctlr->cdev = ctlr_dev;
	fcoe = fcoe_ctlr_priv(ctlr);

	dev_hold(netdev);

	/*
	 * Initialize FIP.
	 */
	fcoe_ctlr_init(ctlr, fip_mode);
	ctlr->send = fcoe_fip_send;
	ctlr->update_mac = fcoe_update_src_mac;
	ctlr->get_src_addr = fcoe_get_src_mac;

	err = fcoe_interface_setup(fcoe, netdev);
	if (err) {
		fcoe_ctlr_destroy(ctlr);
		fcoe_ctlr_device_delete(ctlr_dev);
		dev_put(netdev);
		fcoe = ERR_PTR(err);
		goto out_putmod;
	}

	goto out;

out_putmod:
	module_put(THIS_MODULE);
out:
	return fcoe;
}

/**
 * fcoe_interface_remove() - remove FCoE interface from netdev
 * @fcoe: The FCoE interface to be cleaned up
 *
 * Caller must be holding the RTNL mutex
 */
static void fcoe_interface_remove(struct fcoe_interface *fcoe)
{
	struct net_device *netdev = fcoe->netdev;
	struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
	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);
	if (fip->mode == FIP_MODE_VN2VN) {
		dev_mc_del(netdev, FIP_ALL_VN2VN_MACS);
		dev_mc_del(netdev, FIP_ALL_P2P_MACS);
	} else
		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->removed = 1;
}


/**
 * fcoe_interface_cleanup() - Clean up a FCoE interface
 * @fcoe: The FCoE interface to be cleaned up
 */
static void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
{
	struct net_device *netdev = fcoe->netdev;
	struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);

	rtnl_lock();
	if (!fcoe->removed)
		fcoe_interface_remove(fcoe);
	rtnl_unlock();

	/* Release the self-reference taken during fcoe_interface_create() */
	/* tear-down the FCoE controller */
	fcoe_ctlr_destroy(fip);
	scsi_host_put(fip->lp->host);
	dev_put(netdev);
	module_put(THIS_MODULE);
}

/**
 * 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;
	struct fcoe_ctlr *ctlr;

	fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type);
	ctlr = fcoe_to_ctlr(fcoe);
	fcoe_ctlr_recv(ctlr, skb);
	return 0;
}

/**
 * fcoe_port_send() - Send an Ethernet-encapsulated FIP/FCoE frame
 * @port: The FCoE port
 * @skb: The FIP/FCoE packet to be sent
 */
static void fcoe_port_send(struct fcoe_port *port, struct sk_buff *skb)
{
	if (port->fcoe_pending_queue.qlen)
		fcoe_check_wait_queue(port->lport, skb);
	else if (fcoe_start_io(skb))
		fcoe_check_wait_queue(port->lport, skb);
}

/**
 * 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;
	fcoe_port_send(lport_priv(fip->lp), 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->priv;

	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);
}

/**
 * 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_netdev_features_change - Updates the lport's offload flags based
 * on the LLD netdev's FCoE feature flags
 */
static void fcoe_netdev_features_change(struct fc_lport *lport,
					struct net_device *netdev)
{
	mutex_lock(&lport->lp_mutex);

	if (netdev->features & NETIF_F_SG)
		lport->sg_supp = 1;
	else
		lport->sg_supp = 0;

	if (netdev->features & NETIF_F_FCOE_CRC) {
		lport->crc_offload = 1;
		FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
	} else {
		lport->crc_offload = 0;
	}

	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);
	} else {
		lport->seq_offload = 0;
		lport->lso_max = 0;
	}

	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);
	} else {
		lport->lro_enabled = 0;
		lport->lro_xid = 0;
	}

	mutex_unlock(&lport->lp_mutex);
}

/**
 * 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_ctlr *ctlr;
	struct fcoe_port *port;

	/* Setup lport private data to point to fcoe softc */
	port = lport_priv(lport);
	fcoe = port->priv;
	ctlr = fcoe_to_ctlr(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 */
	fcoe_netdev_features_change(lport, netdev);

	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) {
		if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN))
			wwnn = fcoe_wwn_from_mac(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(ctlr->ctl_src_addr,
						 2, 0);
		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_scsi_transport;
	else
		lport->host->transportt = fcoe_nport_scsi_transport;

	/* 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_fdmi_info() - Get FDMI related info from 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_shost_config() as it will use local port mutex
 *
 */
static void fcoe_fdmi_info(struct fc_lport *lport, struct net_device *netdev)
{
	struct fcoe_interface *fcoe;
	struct fcoe_port *port;
	struct net_device *realdev;
	int rc;

	port = lport_priv(lport);
	fcoe = port->priv;
	realdev = fcoe->realdev;

	if (!realdev)
		return;

	/* No FDMI state m/c for NPIV ports */
	if (lport->vport)
		return;

	if (realdev->netdev_ops->ndo_fcoe_get_hbainfo) {
		struct netdev_fcoe_hbainfo *fdmi;
		fdmi = kzalloc(sizeof(*fdmi), GFP_KERNEL);
		if (!fdmi)
			return;

		rc = realdev->netdev_ops->ndo_fcoe_get_hbainfo(realdev,
							       fdmi);
		if (rc) {
			printk(KERN_INFO "fcoe: Failed to retrieve FDMI "
					"information from netdev.\n");
			return;
		}

		snprintf(fc_host_serial_number(lport->host),
			 FC_SERIAL_NUMBER_SIZE,
			 "%s",
			 fdmi->serial_number);
		snprintf(fc_host_manufacturer(lport->host),
			 FC_SERIAL_NUMBER_SIZE,
			 "%s",
			 fdmi->manufacturer);
		snprintf(fc_host_model(lport->host),
			 FC_SYMBOLIC_NAME_SIZE,
			 "%s",
			 fdmi->model);
		snprintf(fc_host_model_description(lport->host),
			 FC_SYMBOLIC_NAME_SIZE,
			 "%s",
			 fdmi->model_description);
		snprintf(fc_host_hardware_version(lport->host),
			 FC_VERSION_STRING_SIZE,
			 "%s",
			 fdmi->hardware_version);
		snprintf(fc_host_driver_version(lport->host),
			 FC_VERSION_STRING_SIZE,
			 "%s",
			 fdmi->driver_version);
		snprintf(fc_host_optionrom_version(lport->host),
			 FC_VERSION_STRING_SIZE,
			 "%s",
			 fdmi->optionrom_version);
		snprintf(fc_host_firmware_version(lport->host),
			 FC_VERSION_STRING_SIZE,
			 "%s",
			 fdmi->firmware_version);

		/* Enable FDMI lport states */
		lport->fdmi_enabled = 1;
		kfree(fdmi);
	} else {
		lport->fdmi_enabled = 0;
		printk(KERN_INFO "fcoe: No FDMI support.\n");
	}
}

/**
 * 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.
 *
 * This has been enhanced to work when FCoE stack is operating in target
 * mode.
 *
 * Returns: True for read types I/O, otherwise returns false.
 */
static bool fcoe_oem_match(struct fc_frame *fp)
{
	struct fc_frame_header *fh = fc_frame_header_get(fp);
	struct fcp_cmnd *fcp;

	if (fc_fcp_is_read(fr_fsp(fp)) &&
	    (fr_fsp(fp)->data_len > fcoe_ddp_min))
		return true;
	else if ((fr_fsp(fp) == NULL) &&
		 (fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) &&
		 (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)) {
		fcp = fc_frame_payload_get(fp, sizeof(*fcp));
		if ((fcp->fc_flags & FCP_CFL_WRDATA) &&
		    (ntohl(fcp->fc_dl) > fcoe_ddp_min))
			return true;
	}
	return false;
}

/**
 * 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->priv;
	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
 *
 */
static void fcoe_if_destroy(struct fc_lport *lport)
{
	struct fcoe_port *port = lport_priv(lport);
	struct fcoe_interface *fcoe = port->priv;
	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);

	/* Stop the transmit retry timer */
	del_timer_sync(&port->timer);

	/* Free existing transmit skbs */
	fcoe_clean_pending_queue(lport);

	rtnl_lock();
	if (!is_zero_ether_addr(port->data_src_addr))
		dev_uc_del(netdev, port->data_src_addr);
	if (lport->vport)
		synchronize_net();
	else
		fcoe_interface_remove(fcoe);
	rtnl_unlock();

	/* 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);

	/* Destroy lport scsi_priv */
	fc_fcp_destroy(lport);

	/* 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 for vport but hold on to
	 * master lport until it fcoe interface fully cleaned-up.
	 */
	if (lport->vport)
		scsi_host_put(lport->host);
}

/**
 * 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_target() - Call a LLD's ddp_target 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_target(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_target)
		return netdev->netdev_ops->ndo_fcoe_ddp_target(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 fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
	struct net_device *netdev = fcoe->netdev;
	struct fc_lport *lport, *n_port;
	struct fcoe_port *port;
	struct Scsi_Host *shost;
	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(*port));
	else
		lport = libfc_vport_create(vport, sizeof(*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->priv = fcoe;
	port->get_netdev = fcoe_netdev;
	port->max_queue_depth = FCOE_MAX_QUEUE_DEPTH;
	port->min_queue_depth = FCOE_MIN_QUEUE_DEPTH;
	INIT_WORK(&port->destroy_work, fcoe_destroy_work);

	/*
	 * Need to add the lport to the hostlist
	 * so we catch NETDEV_CHANGE events.
	 */
	fcoe_hostlist_add(lport);

	/* 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, ctlr, &fcoe_libfc_fcn_templ, 1);
	if (rc) {
		FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the "
				"interface\n");
		goto out_lp_destroy;
	}

	/* Initialized FDMI information */
	fcoe_fdmi_info(lport, netdev);

	/*
	 * 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.
	 */
	if (!npiv)
		/* lport exch manager allocation */
		rc = fcoe_em_config(lport);
	else {
		shost = vport_to_shost(vport);
		n_port = shost_priv(shost);
		rc = fc_exch_mgr_list_clone(n_port, lport);
	}

	if (rc) {
		FCOE_NETDEV_DBG(netdev, "Could not configure the EM\n");
		goto out_lp_destroy;
	}

	return lport;

out_lp_destroy:
	fc_exch_mgr_free(lport);
out_host_put:
	fcoe_hostlist_del(lport);
	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_nport_scsi_transport =
		fc_attach_transport(&fcoe_nport_fc_functions);
	fcoe_vport_scsi_transport =
		fc_attach_transport(&fcoe_vport_fc_functions);

	if (!fcoe_nport_scsi_transport) {
		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
 */
static int __exit fcoe_if_exit(void)
{
	fc_release_transport(fcoe_nport_scsi_transport);
	fc_release_transport(fcoe_vport_scsi_transport);
	fcoe_nport_scsi_transport = NULL;
	fcoe_vport_scsi_transport = NULL;
	return 0;
}

static void fcoe_thread_cleanup_local(unsigned int cpu)
{
	struct page *crc_eof;
	struct fcoe_percpu_s *p;

	p = per_cpu_ptr(&fcoe_percpu, cpu);
	spin_lock_bh(&p->fcoe_rx_list.lock);
	crc_eof = p->crc_eof_page;
	p->crc_eof_page = NULL;
	p->crc_eof_offset = 0;
	spin_unlock_bh(&p->fcoe_rx_list.lock);

	if (crc_eof)
		put_page(crc_eof);
	flush_work(&p->work);
}

/**
 * fcoe_select_cpu() - Selects CPU to handle post-processing of incoming
 *			command.
 *
 * This routine selects next CPU based on cpumask to distribute
 * incoming requests in round robin.
 *
 * Returns: int CPU number
 */
static inline unsigned int fcoe_select_cpu(void)
{
	static unsigned int selected_cpu;

	selected_cpu = cpumask_next(selected_cpu, cpu_online_mask);
	if (selected_cpu >= nr_cpu_ids)
		selected_cpu = cpumask_first(cpu_online_mask);

	return selected_cpu;
}

/**
 * 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
 */
static 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_ctlr *ctlr;
	struct fcoe_interface *fcoe;
	struct fc_frame_header *fh;
	struct fcoe_percpu_s *fps;
	struct ethhdr *eh;
	unsigned int cpu;

	fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type);
	ctlr = fcoe_to_ctlr(fcoe);
	lport = ctlr->lp;
	if (unlikely(!lport)) {
		FCOE_NETDEV_DBG(netdev, "Cannot find hba structure\n");
		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\n",
			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>");


	skb = skb_share_check(skb, GFP_ATOMIC);

	if (skb == NULL)
		return NET_RX_DROP;

	eh = eth_hdr(skb);

	if (is_fip_mode(ctlr) &&
	    !ether_addr_equal(eh->h_source, ctlr->dest_addr)) {
		FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n",
				eh->h_source);
		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);

	if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) {
		FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n",
				eh->h_dest);
		goto err;
	}

	fr = fcoe_dev_from_skb(skb);
	fr->fr_dev = lport;

	/*
	 * 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 select cpu using rx exchange id
	 * or fcoe_select_cpu().
	 */
	if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)
		cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask;
	else {
		if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)
			cpu = fcoe_select_cpu();
		else
			cpu = ntohs(fh->fh_rx_id) & fc_cpu_mask;
	}

	if (cpu >= nr_cpu_ids)
		goto err;

	fps = &per_cpu(fcoe_percpu, cpu);
	spin_lock(&fps->fcoe_rx_list.lock);
	/*
	 * 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.
	 */

	/*
	 * Note: We used to have a set of conditions under which we would
	 * call fcoe_recv_frame directly, rather than queuing to the rx list
	 * as it could save a few cycles, but doing so is prohibited, as
	 * fcoe_recv_frame has several paths that may sleep, which is forbidden
	 * in softirq context.
	 */
	__skb_queue_tail(&fps->fcoe_rx_list, skb);
	schedule_work_on(cpu, &fps->work);
	spin_unlock(&fps->fcoe_rx_list.lock);

	return NET_RX_SUCCESS;
err:
	per_cpu_ptr(lport->stats, get_cpu())->ErrorFrames++;
	put_cpu();
err2:
	kfree_skb(skb);
	return NET_RX_DROP;
}

/**
 * fcoe_alloc_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
 *
 * Returns: 0 for success
 */
static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen)
{
	struct fcoe_percpu_s *fps;
	int rc;

	fps = &get_cpu_var(fcoe_percpu);
	rc = fcoe_get_paged_crc_eof(skb, tlen, fps);
	put_cpu_var(fcoe_percpu);

	return rc;
}

/**
 * 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
 */
static 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 fc_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->priv;
	struct fcoe_ctlr *ctlr = fcoe_to_ctlr(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(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_alloc_paged_crc_eof(skb, tlen)) {
			kfree_skb(skb);
			return -ENOMEM;
		}
		frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
		cp = kmap_atomic(skb_frag_page(frag))
			+ 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);
		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->priority = fcoe->priority;

	if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN &&
	    fcoe->realdev->features & NETIF_F_HW_VLAN_CTAG_TX) {
		/* must set skb->dev before calling vlan_put_tag */
		skb->dev = fcoe->realdev;
		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
				       vlan_dev_vlan_id(fcoe->netdev));
	} else
		skb->dev = fcoe->netdev;

	/* fill up mac and fcoe headers */
	eh = eth_hdr(skb);
	eh->h_proto = htons(ETH_P_FCOE);
	memcpy(eh->h_dest, ctlr->dest_addr, ETH_ALEN);
	if (ctlr->map_dest)
		memcpy(eh->h_dest + 3, fh->fh_d_id, 3);

	if (unlikely(ctlr->flogi_oxid != FC_XID_UNKNOWN))
		memcpy(eh->h_source, 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->stats, get_cpu());
	stats->TxFrames++;
	stats->TxWords += wlen;
	put_cpu();

	/* send down to lld */
	fr_dev(fp) = lport;
	fcoe_port_send(port, skb);
	return 0;
}

/**
 * fcoe_filter_frames() - filter out bad fcoe frames, i.e. bad CRC
 * @lport: The local port the frame was received on
 * @fp:	   The received frame
 *
 * Return: 0 on passing filtering checks
 */
static inline int fcoe_filter_frames(struct fc_lport *lport,
				     struct fc_frame *fp)
{
	struct fcoe_ctlr *ctlr;
	struct fcoe_interface *fcoe;
	struct fc_frame_header *fh;
	struct sk_buff *skb = (struct sk_buff *)fp;
	struct fc_stats *stats;

	/*
	 * 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 = (struct fc_frame_header *) skb_transport_header(skb);
	fh = fc_frame_header_get(fp);
	if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && fh->fh_type == FC_TYPE_FCP)
		return 0;

	fcoe = ((struct fcoe_port *)lport_priv(lport))->priv;
	ctlr = fcoe_to_ctlr(fcoe);
	if (is_fip_mode(ctlr) && fc_frame_payload_op(fp) == ELS_LOGO &&
	    ntoh24(fh->fh_s_id) == FC_FID_FLOGI) {
		FCOE_DBG("fcoe: dropping FCoE lport LOGO in fip mode\n");
		return -EINVAL;
	}

	if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED) ||
	    le32_to_cpu(fr_crc(fp)) == ~crc32(~0, skb->data, skb->len)) {
		fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
		return 0;
	}

	stats = per_cpu_ptr(lport->stats, get_cpu());
	stats->InvalidCRCCount++;
	if (stats->InvalidCRCCount < 5)
		printk(KERN_WARNING "fcoe: dropping frame with CRC error\n");
	put_cpu();
	return -EINVAL;
}

/**
 * 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 fc_stats *stats;
	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)) {
		FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb\n");
		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\n",
			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);
	skb_linearize(skb); /* check for skb_is_nonlinear is within skb_linearize */

	/*
	 * Frame length checks and setting up the header pointers
	 * was done in fcoe_rcv already.
	 */
	hp = (struct fcoe_hdr *) skb_network_header(skb);

	stats = per_cpu_ptr(lport->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;

	if (!fcoe_filter_frames(lport, fp)) {
		put_cpu();
		fc_exch_recv(lport, fp);
		return;
	}
drop:
	stats->ErrorFrames++;
	put_cpu();
	kfree_skb(skb);
}

/**
 * fcoe_receive_work() - The per-CPU worker
 * @work: The work struct
 *
 */
static void fcoe_receive_work(struct work_struct *work)
{
	struct fcoe_percpu_s *p;
	struct sk_buff *skb;
	struct sk_buff_head tmp;

	p = container_of(work, struct fcoe_percpu_s, work);
	skb_queue_head_init(&tmp);

	spin_lock_bh(&p->fcoe_rx_list.lock);
	skb_queue_splice_init(&p->fcoe_rx_list, &tmp);
	spin_unlock_bh(&p->fcoe_rx_list.lock);

	if (!skb_queue_len(&tmp))
		return;

	while ((skb = __skb_dequeue(&tmp)))
		fcoe_recv_frame(skb);
}

/**
 * fcoe_dev_setup() - Setup the link change notification interface
 */
static void fcoe_dev_setup(void)
{
	register_dcbevent_notifier(&dcb_notifier);
	register_netdevice_notifier(&fcoe_notifier);
}

/**
 * fcoe_dev_cleanup() - Cleanup the link change notification interface
 */
static void fcoe_dev_cleanup(void)
{
	unregister_dcbevent_notifier(&dcb_notifier);
	unregister_netdevice_notifier(&fcoe_notifier);
}

static struct fcoe_interface *
fcoe_hostlist_lookup_realdev_port(struct net_device *netdev)
{
	struct fcoe_interface *fcoe;
	struct net_device *real_dev;

	list_for_each_entry(fcoe, &fcoe_hostlist, list) {
		if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
			real_dev = vlan_dev_real_dev(fcoe->netdev);
		else
			real_dev = fcoe->netdev;

		if (netdev == real_dev)
			return fcoe;
	}
	return NULL;
}

static int fcoe_dcb_app_notification(struct notifier_block *notifier,
				     ulong event, void *ptr)
{
	struct dcb_app_type *entry = ptr;
	struct fcoe_ctlr *ctlr;
	struct fcoe_interface *fcoe;
	struct net_device *netdev;
	int prio;

	if (entry->app.selector != DCB_APP_IDTYPE_ETHTYPE)
		return NOTIFY_OK;

	netdev = dev_get_by_index(&init_net, entry->ifindex);
	if (!netdev)
		return NOTIFY_OK;

	fcoe = fcoe_hostlist_lookup_realdev_port(netdev);
	dev_put(netdev);
	if (!fcoe)
		return NOTIFY_OK;

	ctlr = fcoe_to_ctlr(fcoe);

	if (entry->dcbx & DCB_CAP_DCBX_VER_CEE)
		prio = ffs(entry->app.priority) - 1;
	else
		prio = entry->app.priority;

	if (prio < 0)
		return NOTIFY_OK;

	if (entry->app.protocol == ETH_P_FIP ||
	    entry->app.protocol == ETH_P_FCOE)
		ctlr->priority = prio;

	if (entry->app.protocol == ETH_P_FCOE)
		fcoe->priority = prio;

	return NOTIFY_OK;
}

/**
 * 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 fcoe_ctlr_device *cdev;
	struct fc_lport *lport = NULL;
	struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
	struct fcoe_ctlr *ctlr;
	struct fcoe_interface *fcoe;
	struct fcoe_port *port;
	struct fc_stats *stats;
	u32 link_possible = 1;
	u32 mfs;
	int rc = NOTIFY_OK;

	list_for_each_entry(fcoe, &fcoe_hostlist, list) {
		if (fcoe->netdev == netdev) {
			ctlr = fcoe_to_ctlr(fcoe);
			lport = 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(ctlr->lp);
		queue_work(fcoe_wq, &port->destroy_work);
		goto out;
		break;
	case NETDEV_FEAT_CHANGE:
		fcoe_netdev_features_change(lport, netdev);
		break;
	default:
		FCOE_NETDEV_DBG(netdev, "Unknown event %ld "
				"from netdev netlink\n", event);
	}

	fcoe_link_speed_update(lport);

	cdev = fcoe_ctlr_to_ctlr_dev(ctlr);

	if (link_possible && !fcoe_link_ok(lport)) {
		switch (cdev->enabled) {
		case FCOE_CTLR_DISABLED:
			pr_info("Link up while interface is disabled.\n");
			break;
		case FCOE_CTLR_ENABLED:
		case FCOE_CTLR_UNUSED:
			fcoe_ctlr_link_up(ctlr);
		};
	} else if (fcoe_ctlr_link_down(ctlr)) {
		switch (cdev->enabled) {
		case FCOE_CTLR_DISABLED:
			pr_info("Link down while interface is disabled.\n");
			break;
		case FCOE_CTLR_ENABLED:
		case FCOE_CTLR_UNUSED:
			stats = per_cpu_ptr(lport->stats, get_cpu());
			stats->LinkFailureCount++;
			put_cpu();
			fcoe_clean_pending_queue(lport);
		};
	}
out:
	return rc;
}

/**
 * fcoe_disable() - Disables a FCoE interface
 * @netdev  : The net_device object the Ethernet interface to create on
 *
 * Called from fcoe transport.
 *
 * Returns: 0 for success
 *
 * Deprecated: use fcoe_ctlr_enabled()
 */
static int fcoe_disable(struct net_device *netdev)
{
	struct fcoe_ctlr *ctlr;
	struct fcoe_interface *fcoe;
	int rc = 0;

	mutex_lock(&fcoe_config_mutex);

	rtnl_lock();
	fcoe = fcoe_hostlist_lookup_port(netdev);
	rtnl_unlock();

	if (fcoe) {
		ctlr = fcoe_to_ctlr(fcoe);
		fcoe_ctlr_link_down(ctlr);
		fcoe_clean_pending_queue(ctlr->lp);
	} else
		rc = -ENODEV;

	mutex_unlock(&fcoe_config_mutex);
	return rc;
}

/**
 * fcoe_enable() - Enables a FCoE interface
 * @netdev  : The net_device object the Ethernet interface to create on
 *
 * Called from fcoe transport.
 *
 * Returns: 0 for success
 */
static int fcoe_enable(struct net_device *netdev)
{
	struct fcoe_ctlr *ctlr;
	struct fcoe_interface *fcoe;
	int rc = 0;

	mutex_lock(&fcoe_config_mutex);
	rtnl_lock();
	fcoe = fcoe_hostlist_lookup_port(netdev);
	rtnl_unlock();

	if (!fcoe) {
		rc = -ENODEV;
		goto out;
	}

	ctlr = fcoe_to_ctlr(fcoe);

	if (!fcoe_link_ok(ctlr->lp))
		fcoe_ctlr_link_up(ctlr);

out:
	mutex_unlock(&fcoe_config_mutex);
	return rc;
}

/**
 * fcoe_ctlr_enabled() - Enable or disable an FCoE Controller
 * @cdev: The FCoE Controller that is being enabled or disabled
 *
 * fcoe_sysfs will ensure that the state of 'enabled' has
 * changed, so no checking is necessary here. This routine simply
 * calls fcoe_enable or fcoe_disable, both of which are deprecated.
 * When those routines are removed the functionality can be merged
 * here.
 */
static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev)
{
	struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(cdev);
	struct fc_lport *lport = ctlr->lp;
	struct net_device *netdev = fcoe_netdev(lport);

	switch (cdev->enabled) {
	case FCOE_CTLR_ENABLED:
		return fcoe_enable(netdev);
	case FCOE_CTLR_DISABLED:
		return fcoe_disable(netdev);
	case FCOE_CTLR_UNUSED:
	default:
		return -ENOTSUPP;
	};
}

/**
 * fcoe_destroy() - Destroy a FCoE interface
 * @netdev  : The net_device object the Ethernet interface to create on
 *
 * Called from fcoe transport
 *
 * Returns: 0 for success
 */
static int fcoe_destroy(struct net_device *netdev)
{
	struct fcoe_ctlr *ctlr;
	struct fcoe_interface *fcoe;
	struct fc_lport *lport;
	struct fcoe_port *port;
	int rc = 0;

	mutex_lock(&fcoe_config_mutex);
	rtnl_lock();
	fcoe = fcoe_hostlist_lookup_port(netdev);
	if (!fcoe) {
		rc = -ENODEV;
		goto out_nodev;
	}
	ctlr = fcoe_to_ctlr(fcoe);
	lport = ctlr->lp;
	port = lport_priv(lport);
	list_del(&fcoe->list);
	queue_work(fcoe_wq, &port->destroy_work);
out_nodev:
	rtnl_unlock();
	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_ctlr_device *cdev;
	struct fcoe_ctlr *ctlr;
	struct fcoe_port *port;
	struct fcoe_interface *fcoe;
	struct Scsi_Host *shost;
	struct fc_host_attrs *fc_host;
	unsigned long flags;
	struct fc_vport *vport;
	struct fc_vport *next_vport;

	port = container_of(work, struct fcoe_port, destroy_work);
	shost = port->lport->host;
	fc_host = shost_to_fc_host(shost);

	/* Loop through all the vports and mark them for deletion */
	spin_lock_irqsave(shost->host_lock, flags);
	list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
		if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
			continue;
		} else {
			vport->flags |= FC_VPORT_DELETING;
			queue_work(fc_host_work_q(shost),
				   &vport->vport_delete_work);
		}
	}
	spin_unlock_irqrestore(shost->host_lock, flags);

	flush_workqueue(fc_host_work_q(shost));

	mutex_lock(&fcoe_config_mutex);

	fcoe = port->priv;
	ctlr = fcoe_to_ctlr(fcoe);
	cdev = fcoe_ctlr_to_ctlr_dev(ctlr);

	fcoe_if_destroy(port->lport);
	fcoe_interface_cleanup(fcoe);

	mutex_unlock(&fcoe_config_mutex);

	fcoe_ctlr_device_delete(cdev);
}

/**
 * fcoe_match() - Check if the FCoE is supported on the given netdevice
 * @netdev  : The net_device object the Ethernet interface to create on
 *
 * Called from fcoe transport.
 *
 * Returns: always returns true as this is the default FCoE transport,
 * i.e., support all netdevs.
 */
static bool fcoe_match(struct net_device *netdev)
{
	return true;
}

/**
 * fcoe_dcb_create() - Initialize DCB attributes and hooks
 * @netdev: The net_device object of the L2 link that should be queried
 * @port: The fcoe_port to bind FCoE APP priority with
 * @
 */
static void fcoe_dcb_create(struct fcoe_interface *fcoe)
{
#ifdef CONFIG_DCB
	int dcbx;
	u8 fup, up;
	struct net_device *netdev = fcoe->realdev;
	struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
	struct dcb_app app = {
				.priority = 0,
				.protocol = ETH_P_FCOE
			     };

	/* setup DCB priority attributes. */
	if (netdev && netdev->dcbnl_ops && netdev->dcbnl_ops->getdcbx) {
		dcbx = netdev->dcbnl_ops->getdcbx(netdev);

		if (dcbx & DCB_CAP_DCBX_VER_IEEE) {
			app.selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE;
			up = dcb_ieee_getapp_mask(netdev, &app);
			app.protocol = ETH_P_FIP;
			fup = dcb_ieee_getapp_mask(netdev, &app);
		} else {
			app.selector = DCB_APP_IDTYPE_ETHTYPE;
			up = dcb_getapp(netdev, &app);
			app.protocol = ETH_P_FIP;
			fup = dcb_getapp(netdev, &app);
		}

		fcoe->priority = ffs(up) ? ffs(up) - 1 : 0;
		ctlr->priority = ffs(fup) ? ffs(fup) - 1 : fcoe->priority;
	}
#endif
}

enum fcoe_create_link_state {
	FCOE_CREATE_LINK_DOWN,
	FCOE_CREATE_LINK_UP,
};

/**
 * _fcoe_create() - (internal) Create a fcoe interface
 * @netdev  :   The net_device object the Ethernet interface to create on
 * @fip_mode:   The FIP mode for this creation
 * @link_state: The ctlr link state on creation
 *
 * Called from either the libfcoe 'create' module parameter
 * via fcoe_create or from fcoe_syfs's ctlr_create file.
 *
 * libfcoe's 'create' module parameter is deprecated so some
 * consolidation of code can be done when that interface is
 * removed.
 */
static int _fcoe_create(struct net_device *netdev, enum fip_state fip_mode,
			enum fcoe_create_link_state link_state)
{
	int rc = 0;
	struct fcoe_ctlr_device *ctlr_dev;
	struct fcoe_ctlr *ctlr;
	struct fcoe_interface *fcoe;
	struct fc_lport *lport;

	mutex_lock(&fcoe_config_mutex);
	rtnl_lock();

	/* look for existing lport */
	if (fcoe_hostlist_lookup(netdev)) {
		rc = -EEXIST;
		goto out_nodev;
	}

	fcoe = fcoe_interface_create(netdev, fip_mode);
	if (IS_ERR(fcoe)) {
		rc = PTR_ERR(fcoe);
		goto out_nodev;
	}

	ctlr = fcoe_to_ctlr(fcoe);
	ctlr_dev = fcoe_ctlr_to_ctlr_dev(ctlr);
	lport = fcoe_if_create(fcoe, &ctlr_dev->dev, 0);
	if (IS_ERR(lport)) {
		printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
		       netdev->name);
		rc = -EIO;
		rtnl_unlock();
		fcoe_interface_cleanup(fcoe);
		mutex_unlock(&fcoe_config_mutex);
		fcoe_ctlr_device_delete(ctlr_dev);
		goto out;
	}

	/* Make this the "master" N_Port */
	ctlr->lp = lport;

	/* setup DCB priority attributes. */
	fcoe_dcb_create(fcoe);

	/* start FIP Discovery and FLOGI */
	lport->boot_time = jiffies;
	fc_fabric_login(lport);

	/*
	 * If the fcoe_ctlr_device is to be set to DISABLED
	 * it must be done after the lport is added to the
	 * hostlist, but before the rtnl_lock is released.
	 * This is because the rtnl_lock protects the
	 * hostlist that fcoe_device_notification uses. If
	 * the FCoE Controller is intended to be created
	 * DISABLED then 'enabled' needs to be considered
	 * handling link events. 'enabled' must be set
	 * before the lport can be found in the hostlist
	 * when a link up event is received.
	 */
	if (link_state == FCOE_CREATE_LINK_UP)
		ctlr_dev->enabled = FCOE_CTLR_ENABLED;
	else
		ctlr_dev->enabled = FCOE_CTLR_DISABLED;

	if (link_state == FCOE_CREATE_LINK_UP &&
	    !fcoe_link_ok(lport)) {
		rtnl_unlock();
		fcoe_ctlr_link_up(ctlr);
		mutex_unlock(&fcoe_config_mutex);
		return rc;
	}

out_nodev:
	rtnl_unlock();
	mutex_unlock(&fcoe_config_mutex);
out:
	return rc;
}

/**
 * fcoe_create() - Create a fcoe interface
 * @netdev  : The net_device object the Ethernet interface to create on
 * @fip_mode: The FIP mode for this creation
 *
 * Called from fcoe transport
 *
 * Returns: 0 for success
 */
static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode)
{
	return _fcoe_create(netdev, fip_mode, FCOE_CREATE_LINK_UP);
}

/**
 * fcoe_ctlr_alloc() - Allocate a fcoe interface from fcoe_sysfs
 * @netdev: The net_device to be used by the allocated FCoE Controller
 *
 * This routine is called from fcoe_sysfs. It will start the fcoe_ctlr
 * in a link_down state. The allows the user an opportunity to configure
 * the FCoE Controller from sysfs before enabling the FCoE Controller.
 *
 * Creating in with this routine starts the FCoE Controller in Fabric
 * mode. The user can change to VN2VN or another mode before enabling.
 */
static int fcoe_ctlr_alloc(struct net_device *netdev)
{
	return _fcoe_create(netdev, FIP_MODE_FABRIC,
			    FCOE_CREATE_LINK_DOWN);
}

/**
 * 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
 *
 */
static int fcoe_link_ok(struct fc_lport *lport)
{
	struct net_device *netdev = fcoe_netdev(lport);

	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 flush the work item for each CPU. The work
 * item on each possible CPU is flushed because we may have used the per-CPU
 * struct of an offline CPU.
 */
static void fcoe_percpu_clean(struct fc_lport *lport)
{
	struct fcoe_percpu_s *pp;
	unsigned int cpu;

	for_each_possible_cpu(cpu) {
		pp = &per_cpu(fcoe_percpu, cpu);

		flush_work(&pp->work);
	}
}

/**
 * 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)
 */
static int fcoe_reset(struct Scsi_Host *shost)
{
	struct fc_lport *lport = shost_priv(shost);
	struct fcoe_port *port = lport_priv(lport);
	struct fcoe_interface *fcoe = port->priv;
	struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
	struct fcoe_ctlr_device *cdev = fcoe_ctlr_to_ctlr_dev(ctlr);

	fcoe_ctlr_link_down(ctlr);
	fcoe_clean_pending_queue(ctlr->lp);

	if (cdev->enabled != FCOE_CTLR_DISABLED &&
	    !fcoe_link_ok(ctlr->lp))
		fcoe_ctlr_link_up(ctlr);
	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_ctlr *ctlr;
	struct fcoe_interface *fcoe;

	fcoe = fcoe_hostlist_lookup_port(netdev);
	ctlr = fcoe_to_ctlr(fcoe);
	return (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->priv;
		list_add_tail(&fcoe->list, &fcoe_hostlist);
	}
	return 0;
}

/**
 * fcoe_hostlist_del() - Remove 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
 *
 */
static void fcoe_hostlist_del(const struct fc_lport *lport)
{
	struct fcoe_interface *fcoe;
	struct fcoe_port *port;

	port = lport_priv(lport);
	fcoe = port->priv;
	list_del(&fcoe->list);
	return;
}

static struct fcoe_transport fcoe_sw_transport = {
	.name = {FCOE_TRANSPORT_DEFAULT},
	.attached = false,
	.list = LIST_HEAD_INIT(fcoe_sw_transport.list),
	.match = fcoe_match,
	.alloc = fcoe_ctlr_alloc,
	.create = fcoe_create,
	.destroy = fcoe_destroy,
	.enable = fcoe_enable,
	.disable = fcoe_disable,
};

/**
 * 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;

	fcoe_wq = alloc_workqueue("fcoe", 0, 0);
	if (!fcoe_wq)
		return -ENOMEM;

	/* register as a fcoe transport */
	rc = fcoe_transport_attach(&fcoe_sw_transport);
	if (rc) {
		printk(KERN_ERR "failed to register an fcoe transport, check "
			"if libfcoe is loaded\n");
		return rc;
	}

	mutex_lock(&fcoe_config_mutex);

	for_each_possible_cpu(cpu) {
		p = per_cpu_ptr(&fcoe_percpu, cpu);
		INIT_WORK(&p->work, fcoe_receive_work);
		skb_queue_head_init(&p->fcoe_rx_list);
	}

	/* 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:
	mutex_unlock(&fcoe_config_mutex);
	destroy_workqueue(fcoe_wq);
	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_ctlr *ctlr;
	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) {
		ctlr = fcoe_to_ctlr(fcoe);
		port = lport_priv(ctlr->lp);
		fcoe_hostlist_del(port->lport);
		queue_work(fcoe_wq, &port->destroy_work);
	}
	rtnl_unlock();

	for_each_possible_cpu(cpu)
		fcoe_thread_cleanup_local(cpu);

	mutex_unlock(&fcoe_config_mutex);

	/*
	 * destroy_work's may be chained but destroy_workqueue()
	 * can take care of them. Just kill the fcoe_wq.
	 */
	destroy_workqueue(fcoe_wq);

	/*
	 * Detaching from the scsi transport must happen after all
	 * destroys are done on the fcoe_wq. destroy_workqueue will
	 * enusre the fcoe_wq is flushed.
	 */
	fcoe_if_exit();

	/* detach from fcoe transport */
	fcoe_transport_detach(&fcoe_sw_transport);
}
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 management 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;
	/* pre-FIP */
	if (is_zero_ether_addr(mac))
		fcoe_ctlr_recv_flogi(fip, lport, fp);
	if (!is_zero_ether_addr(mac))
		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 management 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->priv;
	struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
	struct fc_frame_header *fh = fc_frame_header_get(fp);

	switch (op) {
	case ELS_FLOGI:
	case ELS_FDISC:
		if (lport->point_to_multipoint)
			break;
		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->priv;
	struct net_device *netdev = fcoe->netdev;
	struct fc_lport *vn_port;
	int rc;
	char buf[32];

	rc = fcoe_validate_vport_create(vport);
	if (rc) {
		fcoe_wwn_to_str(vport->port_name, buf, sizeof(buf));
		printk(KERN_ERR "fcoe: Failed to create vport, "
			"WWPN (0x%s) already exists\n",
			buf);
		return rc;
	}

	mutex_lock(&fcoe_config_mutex);
	rtnl_lock();
	vn_port = fcoe_if_create(fcoe, &vport->dev, 1);
	rtnl_unlock();
	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;

	mutex_lock(&n_port->lp_mutex);
	list_del(&vn_port->list);
	mutex_unlock(&n_port->lp_mutex);

	mutex_lock(&fcoe_config_mutex);
	fcoe_if_destroy(vn_port);
	mutex_unlock(&fcoe_config_mutex);

	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);
}

static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *fcf_dev)
{
	struct fcoe_ctlr_device *ctlr_dev =
		fcoe_fcf_dev_to_ctlr_dev(fcf_dev);
	struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
	struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr);

	fcf_dev->vlan_id = vlan_dev_vlan_id(fcoe->netdev);
}

/**
 * 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->priv;
	struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);

	if (fp && fc_frame_payload_op(fp) == ELS_FLOGI)
		fcoe_ctlr_recv_flogi(ctlr, lport, fp);
}