fcoe.c 46.0 KB
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/*
 * Copyright(c) 2007 - 2008 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/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>
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#include <scsi/fc/fc_fip.h>
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#include <scsi/libfc.h>
#include <scsi/fc_frame.h>
#include <scsi/libfcoe.h>

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#include "fcoe.h"
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static int debug_fcoe;
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MODULE_AUTHOR("Open-FCoE.org");
MODULE_DESCRIPTION("FCoE");
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MODULE_LICENSE("GPL v2");
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/* fcoe host list */
LIST_HEAD(fcoe_hostlist);
DEFINE_RWLOCK(fcoe_hostlist_lock);
DEFINE_TIMER(fcoe_timer, NULL, 0, 0);
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DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
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/* Function Prototypes */
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static int fcoe_reset(struct Scsi_Host *shost);
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 *arg);
static void fcoe_clean_pending_queue(struct fc_lport *lp);
static void fcoe_percpu_clean(struct fc_lport *lp);
static int fcoe_link_ok(struct fc_lport *lp);

static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *);
static int fcoe_hostlist_add(const struct fc_lport *);
static int fcoe_hostlist_remove(const struct fc_lport *);

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static int fcoe_check_wait_queue(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);

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

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static struct scsi_transport_template *scsi_transport_fcoe_sw;

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,
};

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 = 32,
	.can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
	.use_clustering = ENABLE_CLUSTERING,
	.sg_tablesize = SG_ALL,
	.max_sectors = 0xffff,
};

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/**
 * fcoe_fip_recv - handle a received FIP frame.
 * @skb: the receive skb
 * @dev: associated &net_device
 * @ptype: the &packet_type structure which was used to register this handler.
 * @orig_dev: original receive &net_device, in case @dev is a bond.
 *
 * Returns: 0 for success
 */
static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *dev,
			 struct packet_type *ptype,
			 struct net_device *orig_dev)
{
	struct fcoe_softc *fc;

	fc = container_of(ptype, struct fcoe_softc, fip_packet_type);
	fcoe_ctlr_recv(&fc->ctlr, skb);
	return 0;
}

/**
 * fcoe_fip_send() - send an Ethernet-encapsulated FIP frame.
 * @fip: FCoE controller.
 * @skb: FIP Packet.
 */
static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
	skb->dev = fcoe_from_ctlr(fip)->real_dev;
	dev_queue_xmit(skb);
}

/**
 * fcoe_update_src_mac() - Update Ethernet MAC filters.
 * @fip: FCoE controller.
 * @old: Unicast MAC address to delete if the MAC is non-zero.
 * @new: 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 fcoe_ctlr *fip, u8 *old, u8 *new)
{
	struct fcoe_softc *fc;

	fc = fcoe_from_ctlr(fip);
	rtnl_lock();
	if (!is_zero_ether_addr(old))
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		dev_unicast_delete(fc->real_dev, old);
	dev_unicast_add(fc->real_dev, new);
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	rtnl_unlock();
}

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/**
 * fcoe_lport_config() - sets up the fc_lport
 * @lp: ptr to the fc_lport
 *
 * Returns: 0 for success
 */
static int fcoe_lport_config(struct fc_lport *lp)
{
	lp->link_up = 0;
	lp->qfull = 0;
	lp->max_retry_count = 3;
	lp->e_d_tov = 2 * 1000;	/* FC-FS default */
	lp->r_a_tov = 2 * 2 * 1000;
	lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
			      FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);

	fc_lport_init_stats(lp);

	/* lport fc_lport related configuration */
	fc_lport_config(lp);

	/* offload related configuration */
	lp->crc_offload = 0;
	lp->seq_offload = 0;
	lp->lro_enabled = 0;
	lp->lro_xid = 0;
	lp->lso_max = 0;

	return 0;
}

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/**
 * fcoe_netdev_cleanup() - clean up netdev configurations
 * @fc: ptr to the fcoe_softc
 */
void fcoe_netdev_cleanup(struct fcoe_softc *fc)
{
	u8 flogi_maddr[ETH_ALEN];

	/* Don't listen for Ethernet packets anymore */
	dev_remove_pack(&fc->fcoe_packet_type);
	dev_remove_pack(&fc->fip_packet_type);

	/* Delete secondary MAC addresses */
	rtnl_lock();
	memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
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	dev_unicast_delete(fc->real_dev, flogi_maddr);
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	if (!is_zero_ether_addr(fc->ctlr.data_src_addr))
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		dev_unicast_delete(fc->real_dev, fc->ctlr.data_src_addr);
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	if (fc->ctlr.spma)
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		dev_unicast_delete(fc->real_dev, fc->ctlr.ctl_src_addr);
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	dev_mc_delete(fc->real_dev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0);
	rtnl_unlock();
}

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/**
 * fcoe_netdev_config() - Set up netdev for SW FCoE
 * @lp : ptr to the fc_lport
 * @netdev : ptr to the associated netdevice struct
 *
 * Must be called after fcoe_lport_config() as it will use lport mutex
 *
 * Returns : 0 for success
 */
static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev)
{
	u32 mfs;
	u64 wwnn, wwpn;
	struct fcoe_softc *fc;
	u8 flogi_maddr[ETH_ALEN];
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	struct netdev_hw_addr *ha;
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	/* Setup lport private data to point to fcoe softc */
	fc = lport_priv(lp);
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	fc->ctlr.lp = lp;
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	fc->real_dev = netdev;
	fc->phys_dev = netdev;

	/* Require support for get_pauseparam ethtool op. */
	if (netdev->priv_flags & IFF_802_1Q_VLAN)
		fc->phys_dev = vlan_dev_real_dev(netdev);

	/* Do not support for bonding device */
	if ((fc->real_dev->priv_flags & IFF_MASTER_ALB) ||
	    (fc->real_dev->priv_flags & IFF_SLAVE_INACTIVE) ||
	    (fc->real_dev->priv_flags & IFF_MASTER_8023AD)) {
		return -EOPNOTSUPP;
	}

	/*
	 * 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 = fc->real_dev->mtu - (sizeof(struct fcoe_hdr) +
				   sizeof(struct fcoe_crc_eof));
	if (fc_set_mfs(lp, mfs))
		return -EINVAL;

	/* offload features support */
	if (fc->real_dev->features & NETIF_F_SG)
		lp->sg_supp = 1;

#ifdef NETIF_F_FCOE_CRC
	if (netdev->features & NETIF_F_FCOE_CRC) {
		lp->crc_offload = 1;
		printk(KERN_DEBUG "fcoe:%s supports FCCRC offload\n",
		       netdev->name);
	}
#endif
#ifdef NETIF_F_FSO
	if (netdev->features & NETIF_F_FSO) {
		lp->seq_offload = 1;
		lp->lso_max = netdev->gso_max_size;
		printk(KERN_DEBUG "fcoe:%s supports LSO for max len 0x%x\n",
		       netdev->name, lp->lso_max);
	}
#endif
	if (netdev->fcoe_ddp_xid) {
		lp->lro_enabled = 1;
		lp->lro_xid = netdev->fcoe_ddp_xid;
		printk(KERN_DEBUG "fcoe:%s supports LRO for max xid 0x%x\n",
		       netdev->name, lp->lro_xid);
	}
	skb_queue_head_init(&fc->fcoe_pending_queue);
	fc->fcoe_pending_queue_active = 0;

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	/* look for SAN MAC address, if multiple SAN MACs exist, only
	 * use the first one for SPMA */
	rcu_read_lock();
	for_each_dev_addr(netdev, ha) {
		if ((ha->type == NETDEV_HW_ADDR_T_SAN) &&
		    (is_valid_ether_addr(fc->ctlr.ctl_src_addr))) {
			memcpy(fc->ctlr.ctl_src_addr, ha->addr, ETH_ALEN);
			fc->ctlr.spma = 1;
			break;
		}
	}
	rcu_read_unlock();

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	/* setup Source Mac Address */
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	if (!fc->ctlr.spma)
		memcpy(fc->ctlr.ctl_src_addr, fc->real_dev->dev_addr,
		       fc->real_dev->addr_len);
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	wwnn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 1, 0);
	fc_set_wwnn(lp, wwnn);
	/* XXX - 3rd arg needs to be vlan id */
	wwpn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 2, 0);
	fc_set_wwpn(lp, wwpn);

	/*
	 * Add FCoE MAC address as second unicast MAC address
	 * or enter promiscuous mode if not capable of listening
	 * for multiple unicast MACs.
	 */
	rtnl_lock();
	memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
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	dev_unicast_add(fc->real_dev, flogi_maddr);
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	if (fc->ctlr.spma)
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		dev_unicast_add(fc->real_dev, fc->ctlr.ctl_src_addr);
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	dev_mc_add(fc->real_dev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0);
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	rtnl_unlock();

	/*
	 * setup the receive function from ethernet driver
	 * on the ethertype for the given device
	 */
	fc->fcoe_packet_type.func = fcoe_rcv;
	fc->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
	fc->fcoe_packet_type.dev = fc->real_dev;
	dev_add_pack(&fc->fcoe_packet_type);

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	fc->fip_packet_type.func = fcoe_fip_recv;
	fc->fip_packet_type.type = htons(ETH_P_FIP);
	fc->fip_packet_type.dev = fc->real_dev;
	dev_add_pack(&fc->fip_packet_type);

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	return 0;
}

/**
 * fcoe_shost_config() - Sets up fc_lport->host
 * @lp : ptr to the fc_lport
 * @shost : ptr to the associated scsi host
 * @dev : device associated to 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 *lp, struct Scsi_Host *shost,
				struct device *dev)
{
	int rc = 0;

	/* lport scsi host config */
	lp->host = shost;

	lp->host->max_lun = FCOE_MAX_LUN;
	lp->host->max_id = FCOE_MAX_FCP_TARGET;
	lp->host->max_channel = 0;
	lp->host->transportt = scsi_transport_fcoe_sw;

	/* add the new host to the SCSI-ml */
	rc = scsi_add_host(lp->host, dev);
	if (rc) {
		FC_DBG("fcoe_shost_config:error on scsi_add_host\n");
		return rc;
	}
	sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s",
		FCOE_NAME, FCOE_VERSION,
		fcoe_netdev(lp)->name);

	return 0;
}

/**
 * fcoe_em_config() - allocates em for this lport
 * @lp: the port that em is to allocated for
 *
 * Returns : 0 on success
 */
static inline int fcoe_em_config(struct fc_lport *lp)
{
	BUG_ON(lp->emp);

	lp->emp = fc_exch_mgr_alloc(lp, FC_CLASS_3,
				    FCOE_MIN_XID, FCOE_MAX_XID);
	if (!lp->emp)
		return -ENOMEM;

	return 0;
}

/**
 * fcoe_if_destroy() - FCoE software HBA tear-down function
 * @netdev: ptr to the associated net_device
 *
 * Returns: 0 if link is OK for use by FCoE.
 */
static int fcoe_if_destroy(struct net_device *netdev)
{
	struct fc_lport *lp = NULL;
	struct fcoe_softc *fc;

	BUG_ON(!netdev);

	printk(KERN_DEBUG "fcoe_if_destroy:interface on %s\n",
	       netdev->name);

	lp = fcoe_hostlist_lookup(netdev);
	if (!lp)
		return -ENODEV;

	fc = lport_priv(lp);

	/* Logout of the fabric */
	fc_fabric_logoff(lp);

	/* Remove the instance from fcoe's list */
	fcoe_hostlist_remove(lp);

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	/* clean up netdev configurations */
	fcoe_netdev_cleanup(fc);

	/* tear-down the FCoE controller */
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	fcoe_ctlr_destroy(&fc->ctlr);
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	/* Cleanup the fc_lport */
	fc_lport_destroy(lp);
	fc_fcp_destroy(lp);

	/* Detach from the scsi-ml */
	fc_remove_host(lp->host);
	scsi_remove_host(lp->host);

	/* There are no more rports or I/O, free the EM */
	if (lp->emp)
		fc_exch_mgr_free(lp->emp);

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	/* Free the per-CPU receive threads */
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	fcoe_percpu_clean(lp);

	/* Free existing skbs */
	fcoe_clean_pending_queue(lp);

	/* Free memory used by statistical counters */
	fc_lport_free_stats(lp);

	/* Release the net_device and Scsi_Host */
	dev_put(fc->real_dev);
	scsi_host_put(lp->host);

	return 0;
}

/*
 * fcoe_ddp_setup - calls LLD's ddp_setup through net_device
 * @lp:	the corresponding fc_lport
 * @xid: the exchange id for this ddp transfer
 * @sgl: the scatterlist describing this transfer
 * @sgc: number of sg items
 *
 * Returns : 0 no ddp
 */
static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid,
			     struct scatterlist *sgl, unsigned int sgc)
{
	struct net_device *n = fcoe_netdev(lp);

	if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_setup)
		return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc);

	return 0;
}

/*
 * fcoe_ddp_done - calls LLD's ddp_done through net_device
 * @lp:	the corresponding fc_lport
 * @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 *lp, u16 xid)
{
	struct net_device *n = fcoe_netdev(lp);

	if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_done)
		return n->netdev_ops->ndo_fcoe_ddp_done(n, xid);
	return 0;
}

static struct libfc_function_template fcoe_libfc_fcn_templ = {
	.frame_send = fcoe_xmit,
	.ddp_setup = fcoe_ddp_setup,
	.ddp_done = fcoe_ddp_done,
};

/**
 * fcoe_if_create() - this function creates the fcoe interface
 * @netdev: pointer the associated netdevice
 *
 * Creates fc_lport struct and scsi_host for lport, configures lport
 * and starts fabric login.
 *
 * Returns : 0 on success
 */
static int fcoe_if_create(struct net_device *netdev)
{
	int rc;
	struct fc_lport *lp = NULL;
	struct fcoe_softc *fc;
	struct Scsi_Host *shost;

	BUG_ON(!netdev);

	printk(KERN_DEBUG "fcoe_if_create:interface on %s\n",
	       netdev->name);

	lp = fcoe_hostlist_lookup(netdev);
	if (lp)
		return -EEXIST;

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	shost = libfc_host_alloc(&fcoe_shost_template,
				 sizeof(struct fcoe_softc));
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	if (!shost) {
		FC_DBG("Could not allocate host structure\n");
		return -ENOMEM;
	}
	lp = shost_priv(shost);
	fc = lport_priv(lp);

	/* configure fc_lport, e.g., em */
	rc = fcoe_lport_config(lp);
	if (rc) {
		FC_DBG("Could not configure lport\n");
		goto out_host_put;
	}

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	/*
	 * Initialize FIP.
	 */
	fcoe_ctlr_init(&fc->ctlr);
	fc->ctlr.send = fcoe_fip_send;
	fc->ctlr.update_mac = fcoe_update_src_mac;

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	/* configure lport network properties */
	rc = fcoe_netdev_config(lp, netdev);
	if (rc) {
		FC_DBG("Could not configure netdev for the interface\n");
		goto out_netdev_cleanup;
	}
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	/* configure lport scsi host properties */
	rc = fcoe_shost_config(lp, shost, &netdev->dev);
	if (rc) {
		FC_DBG("Could not configure shost for lport\n");
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		goto out_netdev_cleanup;
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	}

	/* lport exch manager allocation */
	rc = fcoe_em_config(lp);
	if (rc) {
		FC_DBG("Could not configure em for lport\n");
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		goto out_netdev_cleanup;
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	}

	/* Initialize the library */
	rc = fcoe_libfc_config(lp, &fcoe_libfc_fcn_templ);
	if (rc) {
		FC_DBG("Could not configure libfc for lport!\n");
		goto out_lp_destroy;
	}

	/* add to lports list */
	fcoe_hostlist_add(lp);

	lp->boot_time = jiffies;

	fc_fabric_login(lp);

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

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	dev_hold(netdev);

	return rc;

out_lp_destroy:
	fc_exch_mgr_free(lp->emp); /* Free the EM */
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out_netdev_cleanup:
	fcoe_netdev_cleanup(fc);
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out_host_put:
	scsi_host_put(lp->host);
	return rc;
}

/**
 * fcoe_if_init() - attach to scsi transport
 *
 * Returns : 0 on success
 */
static int __init fcoe_if_init(void)
{
	/* attach to scsi transport */
	scsi_transport_fcoe_sw =
		fc_attach_transport(&fcoe_transport_function);

	if (!scsi_transport_fcoe_sw) {
		printk(KERN_ERR "fcoe_init:fc_attach_transport() failed\n");
		return -ENODEV;
	}

	return 0;
}

/**
 * fcoe_if_exit() - detach from scsi transport
 *
 * Returns : 0 on success
 */
int __exit fcoe_if_exit(void)
{
	fc_release_transport(scsi_transport_fcoe_sw);
	return 0;
}

658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
/**
 * fcoe_percpu_thread_create() - Create a receive thread for an online cpu
 * @cpu: cpu index for the online cpu
 */
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(p->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() - removes the rx thread for the given cpu
 * @cpu: cpu index the rx thread is to be removed
 *
 * 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 = smp_processor_id();
#endif /* CONFIG_SMP */

	printk(KERN_DEBUG "fcoe: 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) {
			FC_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);
	}
#else
	/*
756
	 * This a non-SMP scenario where the singular Rx thread is
757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
	 * 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() - fcoe cpu hotplug event callback
 * @nfb: callback data block
 * @action: event triggering the callback
 * @hcpu: index for the cpu of this event
 *
 * 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:
		FC_DBG("CPU %x online: Create Rx thread\n", cpu);
		fcoe_percpu_thread_create(cpu);
		break;
	case CPU_DEAD:
	case CPU_DEAD_FROZEN:
		FC_DBG("CPU %x offline: Remove Rx thread\n", cpu);
		fcoe_percpu_thread_destroy(cpu);
		break;
	default:
		break;
	}
	return NOTIFY_OK;
}

static struct notifier_block fcoe_cpu_notifier = {
	.notifier_call = fcoe_cpu_callback,
};

808
/**
809
 * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ
810 811 812
 * @skb: the receive skb
 * @dev: associated net device
 * @ptype: context
813
 * @olddev: last device
814 815 816 817
 *
 * this function will receive the packet and build fc frame and pass it up
 *
 * Returns: 0 for success
818
 */
819 820 821 822 823 824 825 826
int fcoe_rcv(struct sk_buff *skb, struct net_device *dev,
	     struct packet_type *ptype, struct net_device *olddev)
{
	struct fc_lport *lp;
	struct fcoe_rcv_info *fr;
	struct fcoe_softc *fc;
	struct fc_frame_header *fh;
	struct fcoe_percpu_s *fps;
827
	unsigned short oxid;
828
	unsigned int cpu = 0;
829 830

	fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type);
831
	lp = fc->ctlr.lp;
832 833 834 835
	if (unlikely(lp == NULL)) {
		FC_DBG("cannot find hba structure");
		goto err2;
	}
836 837
	if (!lp->link_up)
		goto err2;
838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869

	if (unlikely(debug_fcoe)) {
		FC_DBG("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))) {
		FC_DBG("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);

	oxid = ntohs(fh->fh_ox_id);

	fr = fcoe_dev_from_skb(skb);
	fr->fr_dev = lp;
	fr->ptype = ptype;
870

871 872 873
#ifdef CONFIG_SMP
	/*
	 * The incoming frame exchange id(oxid) is ANDed with num of online
874 875
	 * cpu bits to get cpu and then this cpu is used for selecting
	 * a per cpu kernel thread from fcoe_percpu.
876
	 */
877
	cpu = oxid & (num_online_cpus() - 1);
878
#endif
879

880
	fps = &per_cpu(fcoe_percpu, cpu);
881
	spin_lock_bh(&fps->fcoe_rx_list.lock);
882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905
	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.
		 */
		FC_DBG("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 = first_cpu(cpu_online_map);
		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.
	 */
906 907 908 909 910 911 912 913
	__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:
914
	fc_lport_get_stats(lp)->ErrorFrames++;
915 916 917 918 919 920 921

err2:
	kfree_skb(skb);
	return -1;
}

/**
922
 * fcoe_start_io() - pass to netdev to start xmit for fcoe
923 924 925
 * @skb: the skb to be xmitted
 *
 * Returns: 0 for success
926
 */
927 928 929 930 931 932 933 934 935 936 937 938 939
static inline int fcoe_start_io(struct sk_buff *skb)
{
	int rc;

	skb_get(skb);
	rc = dev_queue_xmit(skb);
	if (rc != 0)
		return rc;
	kfree_skb(skb);
	return 0;
}

/**
940
 * fcoe_get_paged_crc_eof() - in case we need to alloc a page for crc_eof
941 942 943 944
 * @skb: the skb to be xmitted
 * @tlen: total len
 *
 * Returns: 0 for success
945
 */
946 947 948 949 950
static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
{
	struct fcoe_percpu_s *fps;
	struct page *page;

951
	fps = &get_cpu_var(fcoe_percpu);
952 953 954 955
	page = fps->crc_eof_page;
	if (!page) {
		page = alloc_page(GFP_ATOMIC);
		if (!page) {
956
			put_cpu_var(fcoe_percpu);
957 958 959
			return -ENOMEM;
		}
		fps->crc_eof_page = page;
960
		fps->crc_eof_offset = 0;
961 962 963 964 965 966 967 968 969 970 971 972 973 974 975
	}

	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);
	}
976
	put_cpu_var(fcoe_percpu);
977 978 979 980
	return 0;
}

/**
981
 * fcoe_fc_crc() - calculates FC CRC in this fcoe skb
982
 * @fp: the fc_frame containing data to be checksummed
983 984 985
 *
 * This uses crc32() to calculate the crc for fc frame
 * Return   : 32 bit crc
986
 */
987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015
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;
}

/**
1016
 * fcoe_xmit() - FCoE frame transmit function
1017 1018 1019 1020
 * @lp:	the associated local port
 * @fp: the fc_frame to be transmitted
 *
 * Return   : 0 for success
1021
 */
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039
int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp)
{
	int wlen, rc = 0;
	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_softc *fc;
	u8 sof, eof;
	struct fcoe_hdr *hp;

	WARN_ON((fr_len(fp) % sizeof(u32)) != 0);

1040
	fc = lport_priv(lp);
1041
	fh = fc_frame_header_get(fp);
1042 1043 1044 1045
	skb = fp_skb(fp);
	wlen = skb->len / FCOE_WORD_TO_BYTE;

	if (!lp->link_up) {
1046
		kfree_skb(skb);
1047
		return 0;
1048 1049
	}

1050 1051 1052 1053
	if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) &&
	    fcoe_ctlr_els_send(&fc->ctlr, skb))
		return 0;

1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
	sof = fr_sof(fp);
	eof = fr_eof(fp);

	elen = (fc->real_dev->priv_flags & IFF_802_1Q_VLAN) ?
		sizeof(struct vlan_ethhdr) : 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(lp->crc_offload)) {
1065
		skb->ip_summed = CHECKSUM_PARTIAL;
1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077
		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 fc crc and eof to the skb buff */
	if (skb_is_nonlinear(skb)) {
		skb_frag_t *frag;
		if (fcoe_get_paged_crc_eof(skb, tlen)) {
R
Roel Kluin 已提交
1078
			kfree_skb(skb);
1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096
			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;
	}

1097
	/* adjust skb network/transport offsets to match mac/fcoe/fc */
1098 1099 1100 1101
	skb_push(skb, elen + hlen);
	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);
	skb->mac_len = elen;
1102
	skb->protocol = htons(ETH_P_FCOE);
1103 1104 1105 1106 1107
	skb->dev = fc->real_dev;

	/* fill up mac and fcoe headers */
	eh = eth_hdr(skb);
	eh->h_proto = htons(ETH_P_FCOE);
1108
	if (fc->ctlr.map_dest)
1109 1110 1111
		fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id);
	else
		/* insert GW address */
1112
		memcpy(eh->h_dest, fc->ctlr.dest_addr, ETH_ALEN);
1113

1114 1115
	if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN))
		memcpy(eh->h_source, fc->ctlr.ctl_src_addr, ETH_ALEN);
1116
	else
1117
		memcpy(eh->h_source, fc->ctlr.data_src_addr, ETH_ALEN);
1118 1119 1120 1121 1122 1123 1124

	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;

1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
#ifdef NETIF_F_FSO
	/* fcoe lso, mss is in max_payload which is non-zero for FCP data */
	if (lp->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;
	}
#endif
1135
	/* update tx stats: regardless if LLD fails */
1136 1137 1138
	stats = fc_lport_get_stats(lp);
	stats->TxFrames++;
	stats->TxWords += wlen;
1139 1140 1141 1142 1143 1144 1145 1146 1147 1148

	/* send down to lld */
	fr_dev(fp) = lp;
	if (fc->fcoe_pending_queue.qlen)
		rc = fcoe_check_wait_queue(lp);

	if (rc == 0)
		rc = fcoe_start_io(skb);

	if (rc) {
1149 1150 1151
		spin_lock_bh(&fc->fcoe_pending_queue.lock);
		__skb_queue_tail(&fc->fcoe_pending_queue, skb);
		spin_unlock_bh(&fc->fcoe_pending_queue.lock);
1152
		if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
1153
			lp->qfull = 1;
1154 1155 1156 1157 1158
	}

	return 0;
}

1159 1160
/**
 * fcoe_percpu_receive_thread() - recv thread per cpu
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179
 * @arg: ptr to the fcoe per cpu struct
 *
 * Return: 0 for success
 */
int fcoe_percpu_receive_thread(void *arg)
{
	struct fcoe_percpu_s *p = arg;
	u32 fr_len;
	struct fc_lport *lp;
	struct fcoe_rcv_info *fr;
	struct fcoe_dev_stats *stats;
	struct fc_frame_header *fh;
	struct sk_buff *skb;
	struct fcoe_crc_eof crc_eof;
	struct fc_frame *fp;
	u8 *mac = NULL;
	struct fcoe_softc *fc;
	struct fcoe_hdr *hp;

1180
	set_user_nice(current, -20);
1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217

	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);
		fr = fcoe_dev_from_skb(skb);
		lp = fr->fr_dev;
		if (unlikely(lp == NULL)) {
			FC_DBG("invalid HBA Structure");
			kfree_skb(skb);
			continue;
		}

		if (unlikely(debug_fcoe)) {
			FC_DBG("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>");
		}

		/*
		 * Save source MAC address before discarding header.
		 */
		fc = lport_priv(lp);
		if (skb_is_nonlinear(skb))
			skb_linearize(skb);	/* not ideal */
1218
		mac = eth_hdr(skb)->h_source;
1219 1220 1221 1222 1223 1224 1225 1226

		/*
		 * 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);

1227
		stats = fc_lport_get_stats(lp);
1228
		if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
1229 1230 1231 1232 1233 1234 1235 1236
			if (stats->ErrorFrames < 5)
				printk(KERN_WARNING "FCoE version "
				       "mismatch: The frame has "
				       "version %x, but the "
				       "initiator supports version "
				       "%x\n", FC_FCOE_DECAPS_VER(hp),
				       FC_FCOE_VER);
			stats->ErrorFrames++;
1237 1238 1239 1240 1241 1242 1243
			kfree_skb(skb);
			continue;
		}

		skb_pull(skb, sizeof(struct fcoe_hdr));
		fr_len = skb->len - sizeof(struct fcoe_crc_eof);

1244 1245
		stats->RxFrames++;
		stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268

		fp = (struct fc_frame *)skb;
		fc_frame_init(fp);
		fr_dev(fp) = lp;
		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))) {
			kfree_skb(skb);
			continue;
		}
		fr_eof(fp) = crc_eof.fcoe_eof;
		fr_crc(fp) = crc_eof.fcoe_crc32;
		if (pskb_trim(skb, fr_len)) {
			kfree_skb(skb);
			continue;
		}

		/*
		 * 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.
		 */
1269
		if (lp->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY)
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292
			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) {
			fc_exch_recv(lp, lp->emp, fp);
			continue;
		}
		if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
			if (le32_to_cpu(fr_crc(fp)) !=
			    ~crc32(~0, skb->data, fr_len)) {
				if (debug_fcoe || stats->InvalidCRCCount < 5)
					printk(KERN_WARNING "fcoe: dropping "
					       "frame with CRC error\n");
				stats->InvalidCRCCount++;
				stats->ErrorFrames++;
				fc_frame_free(fp);
				continue;
			}
			fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
		}
1293 1294 1295 1296 1297
		if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN) &&
		    fcoe_ctlr_recv_flogi(&fc->ctlr, fp, mac)) {
			fc_frame_free(fp);
			continue;
		}
1298 1299 1300 1301 1302 1303
		fc_exch_recv(lp, lp->emp, fp);
	}
	return 0;
}

/**
1304
 * fcoe_watchdog() - fcoe timer callback
1305 1306
 * @vp:
 *
1307
 * This checks the pending queue length for fcoe and set lport qfull
1308 1309 1310 1311
 * if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the
 * fcoe_hostlist.
 *
 * Returns: 0 for success
1312
 */
1313 1314 1315 1316 1317 1318
void fcoe_watchdog(ulong vp)
{
	struct fcoe_softc *fc;

	read_lock(&fcoe_hostlist_lock);
	list_for_each_entry(fc, &fcoe_hostlist, list) {
1319 1320
		if (fc->ctlr.lp)
			fcoe_check_wait_queue(fc->ctlr.lp);
1321 1322 1323 1324 1325 1326 1327 1328 1329
	}
	read_unlock(&fcoe_hostlist_lock);

	fcoe_timer.expires = jiffies + (1 * HZ);
	add_timer(&fcoe_timer);
}


/**
1330 1331
 * fcoe_check_wait_queue() - attempt to clear the transmit backlog
 * @lp: the fc_lport
1332 1333 1334
 *
 * This empties the wait_queue, dequeue the head of the wait_queue queue
 * and calls fcoe_start_io() for each packet, if all skb have been
1335
 * transmitted, return qlen or -1 if a error occurs, then restore
1336
 * wait_queue and try again later.
1337 1338
 *
 * The wait_queue is used when the skb transmit fails. skb will go
1339
 * in the wait_queue which will be emptied by the timer function or
1340 1341 1342
 * by the next skb transmit.
 *
 * Returns: 0 for success
1343
 */
1344 1345
static int fcoe_check_wait_queue(struct fc_lport *lp)
{
1346
	struct fcoe_softc *fc = lport_priv(lp);
1347
	struct sk_buff *skb;
1348
	int rc = -1;
1349 1350

	spin_lock_bh(&fc->fcoe_pending_queue.lock);
1351 1352 1353
	if (fc->fcoe_pending_queue_active)
		goto out;
	fc->fcoe_pending_queue_active = 1;
1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368

	while (fc->fcoe_pending_queue.qlen) {
		/* keep qlen > 0 until fcoe_start_io succeeds */
		fc->fcoe_pending_queue.qlen++;
		skb = __skb_dequeue(&fc->fcoe_pending_queue);

		spin_unlock_bh(&fc->fcoe_pending_queue.lock);
		rc = fcoe_start_io(skb);
		spin_lock_bh(&fc->fcoe_pending_queue.lock);

		if (rc) {
			__skb_queue_head(&fc->fcoe_pending_queue, skb);
			/* undo temporary increment above */
			fc->fcoe_pending_queue.qlen--;
			break;
1369
		}
1370 1371
		/* undo temporary increment above */
		fc->fcoe_pending_queue.qlen--;
1372
	}
1373 1374 1375

	if (fc->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH)
		lp->qfull = 0;
1376 1377 1378
	fc->fcoe_pending_queue_active = 0;
	rc = fc->fcoe_pending_queue.qlen;
out:
1379
	spin_unlock_bh(&fc->fcoe_pending_queue.lock);
1380
	return rc;
1381 1382 1383
}

/**
1384 1385 1386
 * fcoe_dev_setup() - setup link change notification interface
 */
static void fcoe_dev_setup()
1387 1388 1389 1390 1391
{
	register_netdevice_notifier(&fcoe_notifier);
}

/**
1392 1393
 * fcoe_dev_setup() - cleanup link change notification interface
 */
1394 1395 1396 1397 1398 1399
static void fcoe_dev_cleanup(void)
{
	unregister_netdevice_notifier(&fcoe_notifier);
}

/**
1400
 * fcoe_device_notification() - netdev event notification callback
1401 1402 1403 1404 1405 1406 1407
 * @notifier: context of the notification
 * @event: type of event
 * @ptr: fixed array for output parsed ifname
 *
 * This function is called by the ethernet driver in case of link change event
 *
 * Returns: 0 for success
1408
 */
1409 1410 1411 1412 1413 1414 1415
static int fcoe_device_notification(struct notifier_block *notifier,
				    ulong event, void *ptr)
{
	struct fc_lport *lp = NULL;
	struct net_device *real_dev = ptr;
	struct fcoe_softc *fc;
	struct fcoe_dev_stats *stats;
1416
	u32 link_possible = 1;
1417 1418 1419 1420 1421 1422
	u32 mfs;
	int rc = NOTIFY_OK;

	read_lock(&fcoe_hostlist_lock);
	list_for_each_entry(fc, &fcoe_hostlist, list) {
		if (fc->real_dev == real_dev) {
1423
			lp = fc->ctlr.lp;
1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435
			break;
		}
	}
	read_unlock(&fcoe_hostlist_lock);
	if (lp == NULL) {
		rc = NOTIFY_DONE;
		goto out;
	}

	switch (event) {
	case NETDEV_DOWN:
	case NETDEV_GOING_DOWN:
1436
		link_possible = 0;
1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450
		break;
	case NETDEV_UP:
	case NETDEV_CHANGE:
		break;
	case NETDEV_CHANGEMTU:
		mfs = fc->real_dev->mtu -
			(sizeof(struct fcoe_hdr) +
			 sizeof(struct fcoe_crc_eof));
		if (mfs >= FC_MIN_MAX_FRAME)
			fc_set_mfs(lp, mfs);
		break;
	case NETDEV_REGISTER:
		break;
	default:
1451
		FC_DBG("Unknown event %ld from netdev netlink\n", event);
1452
	}
1453 1454 1455 1456 1457 1458
	if (link_possible && !fcoe_link_ok(lp))
		fcoe_ctlr_link_up(&fc->ctlr);
	else if (fcoe_ctlr_link_down(&fc->ctlr)) {
		stats = fc_lport_get_stats(lp);
		stats->LinkFailureCount++;
		fcoe_clean_pending_queue(lp);
1459 1460 1461 1462 1463 1464
	}
out:
	return rc;
}

/**
1465
 * fcoe_if_to_netdev() - parse a name buffer to get netdev
1466 1467
 * @buffer: incoming buffer to be copied
 *
1468
 * Returns: NULL or ptr to net_device
1469
 */
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485
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;
}

/**
1486
 * fcoe_netdev_to_module_owner() - finds out the driver module of the netdev
1487 1488 1489
 * @netdev: the target netdev
 *
 * Returns: ptr to the struct module, NULL for failure
1490
 */
1491 1492
static struct module *
fcoe_netdev_to_module_owner(const struct net_device *netdev)
1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509
{
	struct device *dev;

	if (!netdev)
		return NULL;

	dev = netdev->dev.parent;
	if (!dev)
		return NULL;

	if (!dev->driver)
		return NULL;

	return dev->driver->owner;
}

/**
1510
 * fcoe_ethdrv_get() - Hold the Ethernet driver
1511 1512
 * @netdev: the target netdev
 *
1513 1514 1515
 * Holds the Ethernet driver module by try_module_get() for
 * the corresponding netdev.
 *
1516
 * Returns: 0 for success
1517
 */
1518 1519 1520 1521 1522 1523
static int fcoe_ethdrv_get(const struct net_device *netdev)
{
	struct module *owner;

	owner = fcoe_netdev_to_module_owner(netdev);
	if (owner) {
1524 1525
		printk(KERN_DEBUG "fcoe:hold driver module %s for %s\n",
		       module_name(owner), netdev->name);
1526 1527 1528 1529 1530 1531
		return  try_module_get(owner);
	}
	return -ENODEV;
}

/**
1532
 * fcoe_ethdrv_put() - Release the Ethernet driver
1533 1534
 * @netdev: the target netdev
 *
1535 1536 1537
 * Releases the Ethernet driver module by module_put for
 * the corresponding netdev.
 *
1538
 * Returns: 0 for success
1539
 */
1540 1541 1542 1543 1544 1545
static int fcoe_ethdrv_put(const struct net_device *netdev)
{
	struct module *owner;

	owner = fcoe_netdev_to_module_owner(netdev);
	if (owner) {
1546 1547
		printk(KERN_DEBUG "fcoe:release driver module %s for %s\n",
		       module_name(owner), netdev->name);
1548 1549 1550 1551 1552 1553 1554
		module_put(owner);
		return 0;
	}
	return -ENODEV;
}

/**
1555
 * fcoe_destroy() - handles the destroy from sysfs
1556
 * @buffer: expected to be an eth if name
1557 1558 1559
 * @kp: associated kernel param
 *
 * Returns: 0 for success
1560
 */
1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575
static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
{
	int rc;
	struct net_device *netdev;

	netdev = fcoe_if_to_netdev(buffer);
	if (!netdev) {
		rc = -ENODEV;
		goto out_nodev;
	}
	/* look for existing lport */
	if (!fcoe_hostlist_lookup(netdev)) {
		rc = -ENODEV;
		goto out_putdev;
	}
1576
	rc = fcoe_if_destroy(netdev);
1577
	if (rc) {
1578
		printk(KERN_ERR "fcoe: fcoe_if_destroy(%s) failed\n",
1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591
		       netdev->name);
		rc = -EIO;
		goto out_putdev;
	}
	fcoe_ethdrv_put(netdev);
	rc = 0;
out_putdev:
	dev_put(netdev);
out_nodev:
	return rc;
}

/**
1592
 * fcoe_create() - Handles the create call from sysfs
1593
 * @buffer: expected to be an eth if name
1594 1595 1596
 * @kp: associated kernel param
 *
 * Returns: 0 for success
1597
 */
1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614
static int fcoe_create(const char *buffer, struct kernel_param *kp)
{
	int rc;
	struct net_device *netdev;

	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_ethdrv_get(netdev);

1615
	rc = fcoe_if_create(netdev);
1616
	if (rc) {
1617
		printk(KERN_ERR "fcoe: fcoe_if_create(%s) failed\n",
1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636
		       netdev->name);
		fcoe_ethdrv_put(netdev);
		rc = -EIO;
		goto out_putdev;
	}
	rc = 0;
out_putdev:
	dev_put(netdev);
out_nodev:
	return rc;
}

module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(create, "string");
MODULE_PARM_DESC(create, "Create fcoe port using net device passed in.");
module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(destroy, "string");
MODULE_PARM_DESC(destroy, "Destroy fcoe port");

1637 1638
/**
 * fcoe_link_ok() - Check if link is ok for the fc_lport
1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652
 * @lp: ptr to the fc_lport
 *
 * Any permanently-disqualifying conditions have been previously checked.
 * This also updates the speed setting, which may change with link for 100/1000.
 *
 * This function should probably be checking for PAUSE support at some point
 * in the future. Currently Per-priority-pause is not determinable using
 * ethtool, so we shouldn't be restrictive until that problem is resolved.
 *
 * Returns: 0 if link is OK for use by FCoE.
 *
 */
int fcoe_link_ok(struct fc_lport *lp)
{
1653
	struct fcoe_softc *fc = lport_priv(lp);
1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680
	struct net_device *dev = fc->real_dev;
	struct ethtool_cmd ecmd = { ETHTOOL_GSET };
	int rc = 0;

	if ((dev->flags & IFF_UP) && netif_carrier_ok(dev)) {
		dev = fc->phys_dev;
		if (dev->ethtool_ops->get_settings) {
			dev->ethtool_ops->get_settings(dev, &ecmd);
			lp->link_supported_speeds &=
				~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
			if (ecmd.supported & (SUPPORTED_1000baseT_Half |
					      SUPPORTED_1000baseT_Full))
				lp->link_supported_speeds |= FC_PORTSPEED_1GBIT;
			if (ecmd.supported & SUPPORTED_10000baseT_Full)
				lp->link_supported_speeds |=
					FC_PORTSPEED_10GBIT;
			if (ecmd.speed == SPEED_1000)
				lp->link_speed = FC_PORTSPEED_1GBIT;
			if (ecmd.speed == SPEED_10000)
				lp->link_speed = FC_PORTSPEED_10GBIT;
		}
	} else
		rc = -1;

	return rc;
}

1681 1682
/**
 * fcoe_percpu_clean() - Clear the pending skbs for an lport
1683 1684 1685 1686 1687 1688 1689 1690 1691
 * @lp: the fc_lport
 */
void fcoe_percpu_clean(struct fc_lport *lp)
{
	struct fcoe_percpu_s *pp;
	struct fcoe_rcv_info *fr;
	struct sk_buff_head *list;
	struct sk_buff *skb, *next;
	struct sk_buff *head;
1692
	unsigned int cpu;
1693

1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705
	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 == lp) {
				__skb_unlink(skb, list);
				kfree_skb(skb);
1706 1707
			}
		}
1708
		spin_unlock_bh(&pp->fcoe_rx_list.lock);
1709 1710 1711 1712
	}
}

/**
1713
 * fcoe_clean_pending_queue() - Dequeue a skb and free it
1714 1715 1716
 * @lp: the corresponding fc_lport
 *
 * Returns: none
1717
 */
1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731
void fcoe_clean_pending_queue(struct fc_lport *lp)
{
	struct fcoe_softc  *fc = lport_priv(lp);
	struct sk_buff *skb;

	spin_lock_bh(&fc->fcoe_pending_queue.lock);
	while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) {
		spin_unlock_bh(&fc->fcoe_pending_queue.lock);
		kfree_skb(skb);
		spin_lock_bh(&fc->fcoe_pending_queue.lock);
	}
	spin_unlock_bh(&fc->fcoe_pending_queue.lock);
}

1732 1733
/**
 * fcoe_reset() - Resets the fcoe
1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744
 * @shost: shost the reset is from
 *
 * Returns: always 0
 */
int fcoe_reset(struct Scsi_Host *shost)
{
	struct fc_lport *lport = shost_priv(shost);
	fc_lport_reset(lport);
	return 0;
}

1745 1746
/**
 * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device
1747
 * @dev: this is currently ptr to net_device
1748 1749 1750
 *
 * Returns: NULL or the located fcoe_softc
 */
1751 1752
static struct fcoe_softc *
fcoe_hostlist_lookup_softc(const struct net_device *dev)
1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766
{
	struct fcoe_softc *fc;

	read_lock(&fcoe_hostlist_lock);
	list_for_each_entry(fc, &fcoe_hostlist, list) {
		if (fc->real_dev == dev) {
			read_unlock(&fcoe_hostlist_lock);
			return fc;
		}
	}
	read_unlock(&fcoe_hostlist_lock);
	return NULL;
}

1767 1768
/**
 * fcoe_hostlist_lookup() - Find the corresponding lport by netdev
1769 1770 1771 1772 1773 1774 1775 1776 1777 1778
 * @netdev: ptr to net_device
 *
 * Returns: 0 for success
 */
struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
{
	struct fcoe_softc *fc;

	fc = fcoe_hostlist_lookup_softc(netdev);

1779
	return (fc) ? fc->ctlr.lp : NULL;
1780 1781
}

1782 1783
/**
 * fcoe_hostlist_add() - Add a lport to lports list
1784
 * @lp: ptr to the fc_lport to be added
1785 1786 1787 1788 1789 1790 1791 1792 1793
 *
 * Returns: 0 for success
 */
int fcoe_hostlist_add(const struct fc_lport *lp)
{
	struct fcoe_softc *fc;

	fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
	if (!fc) {
1794
		fc = lport_priv(lp);
1795 1796 1797 1798 1799 1800 1801
		write_lock_bh(&fcoe_hostlist_lock);
		list_add_tail(&fc->list, &fcoe_hostlist);
		write_unlock_bh(&fcoe_hostlist_lock);
	}
	return 0;
}

1802 1803
/**
 * fcoe_hostlist_remove() - remove a lport from lports list
1804
 * @lp: ptr to the fc_lport to be removed
1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821
 *
 * Returns: 0 for success
 */
int fcoe_hostlist_remove(const struct fc_lport *lp)
{
	struct fcoe_softc *fc;

	fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
	BUG_ON(!fc);
	write_lock_bh(&fcoe_hostlist_lock);
	list_del(&fc->list);
	write_unlock_bh(&fcoe_hostlist_lock);

	return 0;
}

/**
1822
 * fcoe_init() - fcoe module loading initialization
1823 1824
 *
 * Returns 0 on success, negative on failure
1825
 */
1826 1827
static int __init fcoe_init(void)
{
1828
	unsigned int cpu;
1829
	int rc = 0;
1830 1831 1832 1833 1834
	struct fcoe_percpu_s *p;

	INIT_LIST_HEAD(&fcoe_hostlist);
	rwlock_init(&fcoe_hostlist_lock);

1835
	for_each_possible_cpu(cpu) {
1836
		p = &per_cpu(fcoe_percpu, cpu);
1837 1838 1839
		skb_queue_head_init(&p->fcoe_rx_list);
	}

1840 1841
	for_each_online_cpu(cpu)
		fcoe_percpu_thread_create(cpu);
1842

1843 1844 1845 1846
	/* Initialize per CPU interrupt thread */
	rc = register_hotcpu_notifier(&fcoe_cpu_notifier);
	if (rc)
		goto out_free;
1847

1848
	/* Setup link change notification */
1849 1850
	fcoe_dev_setup();

1851 1852 1853
	setup_timer(&fcoe_timer, fcoe_watchdog, 0);

	mod_timer(&fcoe_timer, jiffies + (10 * HZ));
1854

1855
	fcoe_if_init();
1856 1857

	return 0;
1858 1859 1860 1861 1862 1863 1864

out_free:
	for_each_online_cpu(cpu) {
		fcoe_percpu_thread_destroy(cpu);
	}

	return rc;
1865 1866 1867 1868
}
module_init(fcoe_init);

/**
1869
 * fcoe_exit() - fcoe module unloading cleanup
1870 1871
 *
 * Returns 0 on success, negative on failure
1872
 */
1873 1874
static void __exit fcoe_exit(void)
{
1875
	unsigned int cpu;
1876 1877 1878 1879
	struct fcoe_softc *fc, *tmp;

	fcoe_dev_cleanup();

1880
	/* Stop the timer */
1881 1882
	del_timer_sync(&fcoe_timer);

1883
	/* releases the associated fcoe hosts */
1884
	list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list)
1885
		fcoe_if_destroy(fc->real_dev);
1886

1887 1888 1889 1890
	unregister_hotcpu_notifier(&fcoe_cpu_notifier);

	for_each_online_cpu(cpu) {
		fcoe_percpu_thread_destroy(cpu);
1891 1892
	}

1893 1894
	/* detach from scsi transport */
	fcoe_if_exit();
1895 1896
}
module_exit(fcoe_exit);