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[SCSI] fcoe, libfcoe: Add support for FIP. FCoE discovery and keep-alive. 

FIP is the new standard way to discover Fibre-Channel Forwarders (FCFs)
by sending solicitations and listening for advertisements from FCFs.

It also provides for keep-alives and period advertisements so that both
parties know they have connectivity.  If the FCF loses connectivity to
the storage fabric, it can send a Link Reset to inform the E_node.

This version is also compatible with pre-FIP implementations, so no
configured selection between FIP mode and non-FIP mode is required.

We wait a couple seconds after sending the initial solicitation
and then send an old-style FLOGI.  If we receive any FIP frames,
we use FIP only mode.  If the old FLOGI receives a response,
we disable FIP mode.  After every reset or link up, this
determination is repeated.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Joe Eykholt 2009-03-17 11:42:40 -07:00 committed by James Bottomley
parent af5f428763
commit 97c8389d54
4 changed files with 1499 additions and 137 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

232
drivers/scsi/fcoe/fcoe.c
View File

@ -37,6 +37,7 @@
#include <net/rtnetlink.h>
#include <scsi/fc/fc_encaps.h>
#include <scsi/fc/fc_fip.h>
#include <scsi/libfc.h>
#include <scsi/fc_frame.h>
@ -71,7 +72,6 @@ static int fcoe_hostlist_add(const struct fc_lport *);
static int fcoe_hostlist_remove(const struct fc_lport *);
static int fcoe_check_wait_queue(struct fc_lport *);
static void fcoe_recv_flogi(struct fcoe_softc *, struct fc_frame *, u8 *);
static int fcoe_device_notification(struct notifier_block *, ulong, void *);
static void fcoe_dev_setup(void);
static void fcoe_dev_cleanup(void);
@ -185,7 +185,7 @@ static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev)
/* Setup lport private data to point to fcoe softc */
fc = lport_priv(lp);
fc->lp = lp;
fc->ctlr.lp = lp;
fc->real_dev = netdev;
fc->phys_dev = netdev;
@ -210,9 +210,6 @@ static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev)
if (fc_set_mfs(lp, mfs))
return -EINVAL;
if (!fcoe_link_ok(lp))
lp->link_up = 1;
/* offload features support */
if (fc->real_dev->features & NETIF_F_SG)
lp->sg_supp = 1;
@ -242,7 +239,7 @@ static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev)
fc->fcoe_pending_queue_active = 0;
/* setup Source Mac Address */
memcpy(fc->ctl_src_addr, fc->real_dev->dev_addr,
memcpy(fc->ctlr.ctl_src_addr, fc->real_dev->dev_addr,
fc->real_dev->addr_len);
wwnn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 1, 0);
@ -358,6 +355,8 @@ static int fcoe_if_destroy(struct net_device *netdev)
/* Don't listen for Ethernet packets anymore */
dev_remove_pack(&fc->fcoe_packet_type);
dev_remove_pack(&fc->fip_packet_type);
fcoe_ctlr_destroy(&fc->ctlr);
/* Cleanup the fc_lport */
fc_lport_destroy(lp);
@ -375,8 +374,10 @@ static int fcoe_if_destroy(struct net_device *netdev)
rtnl_lock();
memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
dev_unicast_delete(fc->real_dev, flogi_maddr, ETH_ALEN);
if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 }))
dev_unicast_delete(fc->real_dev, fc->data_src_addr, ETH_ALEN);
if (!is_zero_ether_addr(fc->ctlr.data_src_addr))
dev_unicast_delete(fc->real_dev,
fc->ctlr.data_src_addr, ETH_ALEN);
dev_mc_delete(fc->real_dev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0);
rtnl_unlock();
/* Free the per-CPU revieve threads */
@ -437,6 +438,58 @@ static struct libfc_function_template fcoe_libfc_fcn_templ = {
.ddp_done = fcoe_ddp_done,
};
/**
* 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))
dev_unicast_delete(fc->real_dev, old, ETH_ALEN);
dev_unicast_add(fc->real_dev, new, ETH_ALEN);
rtnl_unlock();
}
/**
* fcoe_if_create() - this function creates the fcoe interface
* @netdev: pointer the associated netdevice
@ -485,6 +538,18 @@ static int fcoe_if_create(struct net_device *netdev)
goto out_host_put;
}
/*
* Initialize FIP.
*/
fcoe_ctlr_init(&fc->ctlr);
fc->ctlr.send = fcoe_fip_send;
fc->ctlr.update_mac = fcoe_update_src_mac;
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);
/* configure lport scsi host properties */
rc = fcoe_shost_config(lp, shost, &netdev->dev);
if (rc) {
@ -513,6 +578,9 @@ static int fcoe_if_create(struct net_device *netdev)
fc_fabric_login(lp);
if (!fcoe_link_ok(lp))
fcoe_ctlr_link_up(&fc->ctlr);
dev_hold(netdev);
return rc;
@ -727,11 +795,13 @@ int fcoe_rcv(struct sk_buff *skb, struct net_device *dev,
unsigned int cpu = 0;
fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type);
lp = fc->lp;
lp = fc->ctlr.lp;
if (unlikely(lp == NULL)) {
FC_DBG("cannot find hba structure");
goto err2;
}
if (!lp->link_up)
goto err2;
if (unlikely(debug_fcoe)) {
FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p "
@ -929,7 +999,6 @@ int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp)
unsigned int hlen; /* header length implies the version */
unsigned int tlen; /* trailer length */
unsigned int elen; /* eth header, may include vlan */
int flogi_in_progress = 0;
struct fcoe_softc *fc;
u8 sof, eof;
struct fcoe_hdr *hp;
@ -937,31 +1006,19 @@ int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp)
WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
fc = lport_priv(lp);
/*
* if it is a flogi then we need to learn gw-addr
* and my own fcid
*/
fh = fc_frame_header_get(fp);
if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ)) {
if (fc_frame_payload_op(fp) == ELS_FLOGI) {
fc->flogi_oxid = ntohs(fh->fh_ox_id);
fc->address_mode = FCOE_FCOUI_ADDR_MODE;
fc->flogi_progress = 1;
flogi_in_progress = 1;
} else if (fc->flogi_progress && ntoh24(fh->fh_s_id) != 0) {
/*
* Here we must've gotten an SID by accepting an FLOGI
* from a point-to-point connection. Switch to using
* the source mac based on the SID. The destination
* MAC in this case would have been set by receving the
* FLOGI.
*/
fc_fcoe_set_mac(fc->data_src_addr, fh->fh_s_id);
fc->flogi_progress = 0;
}
skb = fp_skb(fp);
wlen = skb->len / FCOE_WORD_TO_BYTE;
if (!lp->link_up) {
kfree(skb);
return 0;
}
skb = fp_skb(fp);
if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) &&
fcoe_ctlr_els_send(&fc->ctlr, skb))
return 0;
sof = fr_sof(fp);
eof = fr_eof(fp);
@ -1016,16 +1073,16 @@ int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp)
/* fill up mac and fcoe headers */
eh = eth_hdr(skb);
eh->h_proto = htons(ETH_P_FCOE);
if (fc->address_mode == FCOE_FCOUI_ADDR_MODE)
if (fc->ctlr.map_dest)
fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id);
else
/* insert GW address */
memcpy(eh->h_dest, fc->dest_addr, ETH_ALEN);
memcpy(eh->h_dest, fc->ctlr.dest_addr, ETH_ALEN);
if (unlikely(flogi_in_progress))
memcpy(eh->h_source, fc->ctl_src_addr, ETH_ALEN);
if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN))
memcpy(eh->h_source, fc->ctlr.ctl_src_addr, ETH_ALEN);
else
memcpy(eh->h_source, fc->data_src_addr, ETH_ALEN);
memcpy(eh->h_source, fc->ctlr.data_src_addr, ETH_ALEN);
hp = (struct fcoe_hdr *)(eh + 1);
memset(hp, 0, sizeof(*hp));
@ -1125,11 +1182,9 @@ int fcoe_percpu_receive_thread(void *arg)
* Save source MAC address before discarding header.
*/
fc = lport_priv(lp);
if (unlikely(fc->flogi_progress))
mac = eth_hdr(skb)->h_source;
if (skb_is_nonlinear(skb))
skb_linearize(skb); /* not ideal */
mac = eth_hdr(skb)->h_source;
/*
* Frame length checks and setting up the header pointers
@ -1204,71 +1259,16 @@ int fcoe_percpu_receive_thread(void *arg)
}
fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
}
/* non flogi and non data exchanges are handled here */
if (unlikely(fc->flogi_progress))
fcoe_recv_flogi(fc, fp, mac);
if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN) &&
fcoe_ctlr_recv_flogi(&fc->ctlr, fp, mac)) {
fc_frame_free(fp);
continue;
}
fc_exch_recv(lp, lp->emp, fp);
}
return 0;
}
/**
* fcoe_recv_flogi() - flogi receive function
* @fc: associated fcoe_softc
* @fp: the recieved frame
* @sa: the source address of this flogi
*
* This is responsible to parse the flogi response and sets the corresponding
* mac address for the initiator, eitehr OUI based or GW based.
*
* Returns: none
*/
static void fcoe_recv_flogi(struct fcoe_softc *fc, struct fc_frame *fp, u8 *sa)
{
struct fc_frame_header *fh;
u8 op;
fh = fc_frame_header_get(fp);
if (fh->fh_type != FC_TYPE_ELS)
return;
op = fc_frame_payload_op(fp);
if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
fc->flogi_oxid == ntohs(fh->fh_ox_id)) {
/*
* FLOGI accepted.
* If the src mac addr is FC_OUI-based, then we mark the
* address_mode flag to use FC_OUI-based Ethernet DA.
* Otherwise we use the FCoE gateway addr
*/
if (!compare_ether_addr(sa, (u8[6]) FC_FCOE_FLOGI_MAC)) {
fc->address_mode = FCOE_FCOUI_ADDR_MODE;
} else {
memcpy(fc->dest_addr, sa, ETH_ALEN);
fc->address_mode = FCOE_GW_ADDR_MODE;
}
/*
* Remove any previously-set unicast MAC filter.
* Add secondary FCoE MAC address filter for our OUI.
*/
rtnl_lock();
if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 }))
dev_unicast_delete(fc->real_dev, fc->data_src_addr,
ETH_ALEN);
fc_fcoe_set_mac(fc->data_src_addr, fh->fh_d_id);
dev_unicast_add(fc->real_dev, fc->data_src_addr, ETH_ALEN);
rtnl_unlock();
fc->flogi_progress = 0;
} else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
/*
* Save source MAC for point-to-point responses.
*/
memcpy(fc->dest_addr, sa, ETH_ALEN);
fc->address_mode = FCOE_GW_ADDR_MODE;
}
}
/**
* fcoe_watchdog() - fcoe timer callback
* @vp:
@ -1285,8 +1285,8 @@ void fcoe_watchdog(ulong vp)
read_lock(&fcoe_hostlist_lock);
list_for_each_entry(fc, &fcoe_hostlist, list) {
if (fc->lp)
fcoe_check_wait_queue(fc->lp);
if (fc->ctlr.lp)
fcoe_check_wait_queue(fc->ctlr.lp);
}
read_unlock(&fcoe_hostlist_lock);
@ -1387,14 +1387,14 @@ static int fcoe_device_notification(struct notifier_block *notifier,
struct net_device *real_dev = ptr;
struct fcoe_softc *fc;
struct fcoe_dev_stats *stats;
u32 new_link_up;
u32 link_possible = 1;
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) {
lp = fc->lp;
lp = fc->ctlr.lp;
break;
}
}
@ -1404,15 +1404,13 @@ static int fcoe_device_notification(struct notifier_block *notifier,
goto out;
}
new_link_up = lp->link_up;
switch (event) {
case NETDEV_DOWN:
case NETDEV_GOING_DOWN:
new_link_up = 0;
link_possible = 0;
break;
case NETDEV_UP:
case NETDEV_CHANGE:
new_link_up = !fcoe_link_ok(lp);
break;
case NETDEV_CHANGEMTU:
mfs = fc->real_dev->mtu -
@ -1420,22 +1418,18 @@ static int fcoe_device_notification(struct notifier_block *notifier,
sizeof(struct fcoe_crc_eof));
if (mfs >= FC_MIN_MAX_FRAME)
fc_set_mfs(lp, mfs);
new_link_up = !fcoe_link_ok(lp);
break;
case NETDEV_REGISTER:
break;
default:
FC_DBG("unknown event %ld call", event);
FC_DBG("Unknown event %ld from netdev netlink\n", event);
}
if (lp->link_up != new_link_up) {
if (new_link_up)
fc_linkup(lp);
else {
stats = fc_lport_get_stats(lp);
stats->LinkFailureCount++;
fc_linkdown(lp);
fcoe_clean_pending_queue(lp);
}
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);
}
out:
return rc;
@ -1761,7 +1755,7 @@ struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
fc = fcoe_hostlist_lookup_softc(netdev);
return (fc) ? fc->lp : NULL;
return (fc) ? fc->ctlr.lp : NULL;
}
EXPORT_SYMBOL_GPL(fcoe_hostlist_lookup);

19
drivers/scsi/fcoe/fcoe.h
View File

@ -26,10 +26,6 @@
#define FCOE_MAX_QUEUE_DEPTH 256
#define FCOE_LOW_QUEUE_DEPTH 32
/* destination address mode */
#define FCOE_GW_ADDR_MODE 0x00
#define FCOE_FCOUI_ADDR_MODE 0x01
#define FCOE_WORD_TO_BYTE 4
#define FCOE_VERSION "0.1"
@ -59,24 +55,17 @@ struct fcoe_percpu_s {
*/
struct fcoe_softc {
struct list_head list;
struct fc_lport *lp;
struct net_device *real_dev;
struct net_device *phys_dev; /* device with ethtool_ops */
struct packet_type fcoe_packet_type;
struct packet_type fip_packet_type;
struct sk_buff_head fcoe_pending_queue;
u8 fcoe_pending_queue_active;
u8 dest_addr[ETH_ALEN];
u8 ctl_src_addr[ETH_ALEN];
u8 data_src_addr[ETH_ALEN];
/*
* fcoe protocol address learning related stuff
*/
u16 flogi_oxid;
u8 flogi_progress;
u8 address_mode;
struct fcoe_ctlr ctlr;
};
#define fcoe_from_ctlr(fc) container_of(fc, struct fcoe_softc, ctlr)
static inline struct net_device *fcoe_netdev(
const struct fc_lport *lp)
{

1251
drivers/scsi/fcoe/libfcoe.c
View File

File diff suppressed because it is too large Load Diff

134
include/scsi/libfcoe.h
View File

@ -1,5 +1,6 @@
/*
* Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
* Copyright (c) 2008-2009 Cisco Systems, Inc. All rights reserved.
* 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,
@ -20,11 +21,142 @@
#ifndef _LIBFCOE_H
#define _LIBFCOE_H
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/workqueue.h>
#include <scsi/fc/fc_fcoe.h>
#include <scsi/libfc.h>
/*
* FIP tunable parameters.
*/
#define FCOE_CTLR_START_DELAY 2000 /* mS after first adv. to choose FCF */
#define FCOE_CTRL_SOL_TOV 2000 /* min. solicitation interval (mS) */
#define FCOE_CTLR_FCF_LIMIT 20 /* max. number of FCF entries */
/**
* enum fip_state - internal state of FCoE controller.
* @FIP_ST_DISABLED: controller has been disabled or not yet enabled.
* @FIP_ST_LINK_WAIT: the physical link is down or unusable.
* @FIP_ST_AUTO: determining whether to use FIP or non-FIP mode.
* @FIP_ST_NON_FIP: non-FIP mode selected.
* @FIP_ST_ENABLED: FIP mode selected.
*/
enum fip_state {
FIP_ST_DISABLED,
FIP_ST_LINK_WAIT,
FIP_ST_AUTO,
FIP_ST_NON_FIP,
FIP_ST_ENABLED,
};
/**
* struct fcoe_ctlr - FCoE Controller and FIP state.
* @state: internal FIP state for network link and FIP or non-FIP mode.
* @lp: &fc_lport: libfc local port.
* @sel_fcf: currently selected FCF, or NULL.
* @fcfs: list of discovered FCFs.
* @fcf_count: number of discovered FCF entries.
* @sol_time: time when a multicast solicitation was last sent.
* @sel_time: time after which to select an FCF.
* @port_ka_time: time of next port keep-alive.
* @ctlr_ka_time: time of next controller keep-alive.
* @timer: timer struct used for all delayed events.
* @link_work: &work_struct for doing FCF selection.
* @recv_work: &work_struct for receiving FIP frames.
* @fip_recv_list: list of received FIP frames.
* @user_mfs: configured maximum FC frame size, including FC header.
* @flogi_oxid: exchange ID of most recent fabric login.
* @flogi_count: number of FLOGI attempts in AUTO mode.
* @link: current link status for libfc.
* @last_link: last link state reported to libfc.
* @map_dest: use the FC_MAP mode for destination MAC addresses.
* @dest_addr: MAC address of the selected FC forwarder.
* @ctl_src_addr: the native MAC address of our local port.
* @data_src_addr: the assigned MAC address for the local port after FLOGI.
* @send: LLD-supplied function to handle sending of FIP Ethernet frames.
* @update_mac: LLD-supplied function to handle changes to MAC addresses.
* @lock: lock protecting this structure.
*
* This structure is used by all FCoE drivers. It contains information
* needed by all FCoE low-level drivers (LLDs) as well as internal state
* for FIP, and fields shared with the LLDS.
*/
struct fcoe_ctlr {
enum fip_state state;
struct fc_lport *lp;
struct fcoe_fcf *sel_fcf;
struct list_head fcfs;
u16 fcf_count;
unsigned long sol_time;
unsigned long sel_time;
unsigned long port_ka_time;
unsigned long ctlr_ka_time;
struct timer_list timer;
struct work_struct link_work;
struct work_struct recv_work;
struct sk_buff_head fip_recv_list;
u16 user_mfs;
u16 flogi_oxid;
u8 flogi_count;
u8 link;
u8 last_link;
u8 map_dest;
u8 dest_addr[ETH_ALEN];
u8 ctl_src_addr[ETH_ALEN];
u8 data_src_addr[ETH_ALEN];
void (*send)(struct fcoe_ctlr *, struct sk_buff *);
void (*update_mac)(struct fcoe_ctlr *, u8 *old, u8 *new);
spinlock_t lock;
};
/*
* struct fcoe_fcf - Fibre-Channel Forwarder.
* @list: list linkage.
* @time: system time (jiffies) when an advertisement was last received.
* @switch_name: WWN of switch from advertisement.
* @fabric_name: WWN of fabric from advertisement.
* @fc_map: FC_MAP value from advertisement.
* @fcf_mac: Ethernet address of the FCF.
* @vfid: virtual fabric ID.
* @pri: seletion priority, smaller values are better.
* @flags: flags received from advertisement.
* @fka_period: keep-alive period, in jiffies.
*
* A Fibre-Channel Forwarder (FCF) is the entity on the Ethernet that
* passes FCoE frames on to an FC fabric. This structure represents
* one FCF from which advertisements have been received.
*
* When looking up an FCF, @switch_name, @fabric_name, @fc_map, @vfid, and
* @fcf_mac together form the lookup key.
*/
struct fcoe_fcf {
struct list_head list;
unsigned long time;
u64 switch_name;
u64 fabric_name;
u32 fc_map;
u16 vfid;
u8 fcf_mac[ETH_ALEN];
u8 pri;
u16 flags;
u32 fka_period;
};
/* FIP API functions */
void fcoe_ctlr_init(struct fcoe_ctlr *);
void fcoe_ctlr_destroy(struct fcoe_ctlr *);
void fcoe_ctlr_link_up(struct fcoe_ctlr *);
int fcoe_ctlr_link_down(struct fcoe_ctlr *);
int fcoe_ctlr_els_send(struct fcoe_ctlr *, struct sk_buff *);
void fcoe_ctlr_recv(struct fcoe_ctlr *, struct sk_buff *);
int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *, struct fc_frame *fp, u8 *sa);
/* libfcoe funcs */
u64 fcoe_wwn_from_mac(unsigned char mac[], unsigned int, unsigned int);
int fcoe_libfc_config(struct fc_lport *, struct libfc_function_template *);