[PATCH 14/14] fcoe, libfcoe: Add support for FIP. FCoE discovery and keep-alive.

Robert Love
2009-03-17T18:43:04Z

From: Joe Eykholt <jeykholt@cisco.com>

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>
---

drivers/scsi/fcoe/fcoe.c | 232 ++++----
drivers/scsi/fcoe/fcoe.h | 19 -
drivers/scsi/fcoe/libfcoe.c | 1251 +++++++++++++++++++++++++++++++++++++++++++
include/scsi/libfcoe.h | 134 +++++
4 files changed, 1499 insertions(+), 137 deletions(-)

diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index ef60144..919c79c 100644
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -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 */
@@ -438,6 +439,58 @@ static struct libfc_function_template fcoe_libfc_fcn_templ = {
};

/**
+ * 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;
@@ -716,11 +784,13 @@ 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 "
@@ -919,7 +989,6 @@ 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;
@@ -927,31 +996,19 @@ 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);

@@ -1006,16 +1063,16 @@ 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));
@@ -1115,11 +1172,9 @@ 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
@@ -1194,72 +1249,17 @@ 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:
*
@@ -1275,8 +1275,8 @@ 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);

@@ -1377,14 +1377,14 @@ 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;
}
}
@@ -1394,15 +1394,13 @@ 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 -
@@ -1410,22 +1408,18 @@ 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;
@@ -1751,7 +1745,7 @@ 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);

diff --git a/drivers/scsi/fcoe/fcoe.h b/drivers/scsi/fcoe/fcoe.h
index 4a9611f..917aae8 100644
--- a/drivers/scsi/fcoe/fcoe.h
+++ b/drivers/scsi/fcoe/fcoe.h
@@ -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)
{
diff --git a/drivers/scsi/fcoe/libfcoe.c b/drivers/scsi/fcoe/libfcoe.c
index dff97fc..f410f4a 100644
--- a/drivers/scsi/fcoe/libfcoe.c
+++ b/drivers/scsi/fcoe/libfcoe.c
@@ -1,5 +1,6 @@
/*
- * Copyright(c) 2009 Intel Corporation. All rights reserved.
+ * Copyright (c) 2008-2009 Cisco Systems, Inc. All rights reserved.
+ * Copyright (c) 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,
@@ -17,15 +18,1261 @@
* Maintained at www.Open-FCoE.org
*/

+#include <linux/types.h>
#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/timer.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/netdevice.h>
+#include <linux/errno.h>
+#include <linux/bitops.h>
+#include <net/rtnetlink.h>
+
+#include <scsi/fc/fc_els.h>
+#include <scsi/fc/fc_fs.h>
+#include <scsi/fc/fc_fip.h>
+#include <scsi/fc/fc_encaps.h>
+#include <scsi/fc/fc_fcoe.h>

#include <scsi/libfc.h>
+#include <scsi/libfcoe.h>

MODULE_AUTHOR("Open-FCoE.org");
-MODULE_DESCRIPTION("FCoE");
+MODULE_DESCRIPTION("FIP discovery protocol support for FCoE HBAs");
MODULE_LICENSE("GPL v2");

+#define FCOE_CTLR_MIN_FKA 500 /* min keep alive (mS) */
+#define FCOE_CTLR_DEF_FKA FIP_DEF_FKA /* default keep alive (mS) */
+
+static void fcoe_ctlr_timeout(unsigned long);
+static void fcoe_ctlr_link_work(struct work_struct *);
+static void fcoe_ctlr_recv_work(struct work_struct *);
+
+static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;
+
+static u32 fcoe_ctlr_debug; /* 1 for basic, 2 for noisy debug */
+
+#define FIP_DBG_LVL(level, fmt, args...) \
+ do { \
+ if (fcoe_ctlr_debug >= (level)) \
+ FC_DBG(fmt, ##args); \
+ } while (0)
+
+#define FIP_DBG(fmt, args...) FIP_DBG_LVL(1, fmt, ##args)
+
+/*
+ * Return non-zero if FCF fcoe_size has been validated.
+ */
+static inline int fcoe_ctlr_mtu_valid(const struct fcoe_fcf *fcf)
+{
+ return (fcf->flags & FIP_FL_SOL) != 0;
+}
+
+/*
+ * Return non-zero if the FCF is usable.
+ */
+static inline int fcoe_ctlr_fcf_usable(struct fcoe_fcf *fcf)
+{
+ u16 flags = FIP_FL_SOL | FIP_FL_AVAIL;
+
+ return (fcf->flags & flags) == flags;
+}
+
+/**
+ * fcoe_ctlr_init() - Initialize the FCoE Controller instance.
+ * @fip: FCoE controller.
+ */
+void fcoe_ctlr_init(struct fcoe_ctlr *fip)
+{
+ fip->state = FIP_ST_LINK_WAIT;
+ INIT_LIST_HEAD(&fip->fcfs);
+ spin_lock_init(&fip->lock);
+ fip->flogi_oxid = FC_XID_UNKNOWN;
+ setup_timer(&fip->timer, fcoe_ctlr_timeout, (unsigned long)fip);
+ INIT_WORK(&fip->link_work, fcoe_ctlr_link_work);
+ INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work);
+ skb_queue_head_init(&fip->fip_recv_list);
+}
+EXPORT_SYMBOL(fcoe_ctlr_init);
+
+/**
+ * fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller.
+ * @fip: FCoE controller.
+ *
+ * Called with &fcoe_ctlr lock held.
+ */
+static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip)
+{
+ struct fcoe_fcf *fcf;
+ struct fcoe_fcf *next;
+
+ fip->sel_fcf = NULL;
+ list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
+ list_del(&fcf->list);
+ kfree(fcf);
+ }
+ fip->fcf_count = 0;
+ fip->sel_time = 0;
+}
+
+/**
+ * fcoe_ctrl_destroy() - Disable and tear-down the FCoE controller.
+ * @fip: FCoE controller.
+ *
+ * This is called by FCoE drivers before freeing the &fcoe_ctlr.
+ *
+ * The receive handler will have been deleted before this to guarantee
+ * that no more recv_work will be scheduled.
+ *
+ * The timer routine will simply return once we set FIP_ST_DISABLED.
+ * This guarantees that no further timeouts or work will be scheduled.
+ */
+void fcoe_ctlr_destroy(struct fcoe_ctlr *fip)
+{
+ flush_work(&fip->recv_work);
+ spin_lock_bh(&fip->lock);
+ fip->state = FIP_ST_DISABLED;
+ fcoe_ctlr_reset_fcfs(fip);
+ spin_unlock_bh(&fip->lock);
+ del_timer_sync(&fip->timer);
+ flush_work(&fip->link_work);
+}
+EXPORT_SYMBOL(fcoe_ctlr_destroy);
+
+/**
+ * fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port.
+ * @fip: FCoE controller.
+ *
+ * Returns the maximum packet size including the FCoE header and trailer,
+ * but not including any Ethernet or VLAN headers.
+ */
+static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip)
+{
+ /*
+ * Determine the max FCoE frame size allowed, including
+ * FCoE header and trailer.
+ * Note: lp->mfs is currently the payload size, not the frame size.
+ */
+ return fip->lp->mfs + sizeof(struct fc_frame_header) +
+ sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof);
+}
+
+/**
+ * fcoe_ctlr_solicit() - Send a solicitation.
+ * @fip: FCoE controller.
+ * @fcf: Destination FCF. If NULL, a multicast solicitation is sent.
+ */
+static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf)
+{
+ struct sk_buff *skb;
+ struct fip_sol {
+ struct ethhdr eth;
+ struct fip_header fip;
+ struct {
+ struct fip_mac_desc mac;
+ struct fip_wwn_desc wwnn;
+ struct fip_size_desc size;
+ } __attribute__((packed)) desc;
+ } __attribute__((packed)) *sol;
+ u32 fcoe_size;
+
+ skb = dev_alloc_skb(sizeof(*sol));
+ if (!skb)
+ return;
+
+ sol = (struct fip_sol *)skb->data;
+
+ memset(sol, 0, sizeof(*sol));
+ memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN);
+ memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
+ sol->eth.h_proto = htons(ETH_P_FIP);
+
+ sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
+ sol->fip.fip_op = htons(FIP_OP_DISC);
+ sol->fip.fip_subcode = FIP_SC_SOL;
+ sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW);
+ sol->fip.fip_flags = htons(FIP_FL_FPMA);
+
+ sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
+ sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW;
+ memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
+
+ sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
+ sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW;
+ put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn);
+
+ fcoe_size = fcoe_ctlr_fcoe_size(fip);
+ sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
+ sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW;
+ sol->desc.size.fd_size = htons(fcoe_size);
+
+ skb_put(skb, sizeof(*sol));
+ skb->protocol = htons(ETH_P_802_3);
+ skb_reset_mac_header(skb);
+ skb_reset_network_header(skb);
+ fip->send(fip, skb);
+
+ if (!fcf)
+ fip->sol_time = jiffies;
+}
+
+/**
+ * fcoe_ctlr_link_up() - Start FCoE controller.
+ * @fip: FCoE controller.
+ *
+ * Called from the LLD when the network link is ready.
+ */
+void fcoe_ctlr_link_up(struct fcoe_ctlr *fip)
+{
+ spin_lock_bh(&fip->lock);
+ if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) {
+ fip->last_link = 1;
+ fip->link = 1;
+ spin_unlock_bh(&fip->lock);
+ fc_linkup(fip->lp);
+ } else if (fip->state == FIP_ST_LINK_WAIT) {
+ fip->state = FIP_ST_AUTO;
+ fip->last_link = 1;
+ fip->link = 1;
+ spin_unlock_bh(&fip->lock);
+ FIP_DBG("%s", "setting AUTO mode.\n");
+ fc_linkup(fip->lp);
+ fcoe_ctlr_solicit(fip, NULL);
+ } else
+ spin_unlock_bh(&fip->lock);
+}
+EXPORT_SYMBOL(fcoe_ctlr_link_up);
+
+/**
+ * fcoe_ctlr_reset() - Reset FIP.
+ * @fip: FCoE controller.
+ * @new_state: FIP state to be entered.
+ *
+ * Returns non-zero if the link was up and now isn't.
+ */
+static int fcoe_ctlr_reset(struct fcoe_ctlr *fip, enum fip_state new_state)
+{
+ struct fc_lport *lp = fip->lp;
+ int link_dropped;
+
+ spin_lock_bh(&fip->lock);
+ fcoe_ctlr_reset_fcfs(fip);
+ del_timer(&fip->timer);
+ fip->state = new_state;
+ fip->ctlr_ka_time = 0;
+ fip->port_ka_time = 0;
+ fip->sol_time = 0;
+ fip->flogi_oxid = FC_XID_UNKNOWN;
+ fip->map_dest = 0;
+ fip->last_link = 0;
+ link_dropped = fip->link;
+ fip->link = 0;
+ spin_unlock_bh(&fip->lock);
+
+ if (link_dropped)
+ fc_linkdown(lp);
+
+ if (new_state == FIP_ST_ENABLED) {
+ fcoe_ctlr_solicit(fip, NULL);
+ fc_linkup(lp);
+ link_dropped = 0;
+ }
+ return link_dropped;
+}
+
+/**
+ * fcoe_ctlr_link_down() - Stop FCoE controller.
+ * @fip: FCoE controller.
+ *
+ * Returns non-zero if the link was up and now isn't.
+ *
+ * Called from the LLD when the network link is not ready.
+ * There may be multiple calls while the link is down.
+ */
+int fcoe_ctlr_link_down(struct fcoe_ctlr *fip)
+{
+ return fcoe_ctlr_reset(fip, FIP_ST_LINK_WAIT);
+}
+EXPORT_SYMBOL(fcoe_ctlr_link_down);
+
+/**
+ * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF.
+ * @fip: FCoE controller.
+ * @ports: 0 for controller keep-alive, 1 for port keep-alive.
+ * @sa: source MAC address.
+ *
+ * A controller keep-alive is sent every fka_period (typically 8 seconds).
+ * The source MAC is the native MAC address.
+ *
+ * A port keep-alive is sent every 90 seconds while logged in.
+ * The source MAC is the assigned mapped source address.
+ * The destination is the FCF's F-port.
+ */
+static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip, int ports, u8 *sa)
+{
+ struct sk_buff *skb;
+ struct fip_kal {
+ struct ethhdr eth;
+ struct fip_header fip;
+ struct fip_mac_desc mac;
+ } __attribute__((packed)) *kal;
+ struct fip_vn_desc *vn;
+ u32 len;
+ struct fc_lport *lp;
+ struct fcoe_fcf *fcf;
+
+ fcf = fip->sel_fcf;
+ lp = fip->lp;
+ if (!fcf || !fc_host_port_id(lp->host))
+ return;
+
+ len = fcoe_ctlr_fcoe_size(fip) + sizeof(struct ethhdr);
+ BUG_ON(len < sizeof(*kal) + sizeof(*vn));
+ skb = dev_alloc_skb(len);
+ if (!skb)
+ return;
+
+ kal = (struct fip_kal *)skb->data;
+ memset(kal, 0, len);
+ memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
+ memcpy(kal->eth.h_source, sa, ETH_ALEN);
+ kal->eth.h_proto = htons(ETH_P_FIP);
+
+ kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
+ kal->fip.fip_op = htons(FIP_OP_CTRL);
+ kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE;
+ kal->fip.fip_dl_len = htons((sizeof(kal->mac) +
+ ports * sizeof(*vn)) / FIP_BPW);
+ kal->fip.fip_flags = htons(FIP_FL_FPMA);
+
+ kal->mac.fd_desc.fip_dtype = FIP_DT_MAC;
+ kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW;
+ memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
+
+ if (ports) {
+ vn = (struct fip_vn_desc *)(kal + 1);
+ vn->fd_desc.fip_dtype = FIP_DT_VN_ID;
+ vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW;
+ memcpy(vn->fd_mac, fip->data_src_addr, ETH_ALEN);
+ hton24(vn->fd_fc_id, fc_host_port_id(lp->host));
+ put_unaligned_be64(lp->wwpn, &vn->fd_wwpn);
+ }
+
+ skb_put(skb, len);
+ skb->protocol = htons(ETH_P_802_3);
+ skb_reset_mac_header(skb);
+ skb_reset_network_header(skb);
+ fip->send(fip, skb);
+}
+
+/**
+ * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it.
+ * @fip: FCoE controller.
+ * @dtype: FIP descriptor type for the frame.
+ * @skb: FCoE ELS frame including FC header but no FCoE headers.
+ *
+ * Returns non-zero error code on failure.
+ *
+ * The caller must check that the length is a multiple of 4.
+ *
+ * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes).
+ * Headroom includes the FIP encapsulation description, FIP header, and
+ * Ethernet header. The tailroom is for the FIP MAC descriptor.
+ */
+static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip,
+ u8 dtype, struct sk_buff *skb)
+{
+ struct fip_encaps_head {
+ struct ethhdr eth;
+ struct fip_header fip;
+ struct fip_encaps encaps;
+ } __attribute__((packed)) *cap;
+ struct fip_mac_desc *mac;
+ struct fcoe_fcf *fcf;
+ size_t dlen;
+
+ fcf = fip->sel_fcf;
+ if (!fcf)
+ return -ENODEV;
+ dlen = sizeof(struct fip_encaps) + skb->len; /* len before push */
+ cap = (struct fip_encaps_head *)skb_push(skb, sizeof(*cap));
+
+ memset(cap, 0, sizeof(*cap));
+ memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
+ memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
+ cap->eth.h_proto = htons(ETH_P_FIP);
+
+ cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
+ cap->fip.fip_op = htons(FIP_OP_LS);
+ cap->fip.fip_subcode = FIP_SC_REQ;
+ cap->fip.fip_dl_len = htons((dlen + sizeof(*mac)) / FIP_BPW);
+ cap->fip.fip_flags = htons(FIP_FL_FPMA);
+
+ cap->encaps.fd_desc.fip_dtype = dtype;
+ cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW;
+
+ mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac));
+ memset(mac, 0, sizeof(mac));
+ mac->fd_desc.fip_dtype = FIP_DT_MAC;
+ mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW;
+ if (dtype != ELS_FLOGI)
+ memcpy(mac->fd_mac, fip->data_src_addr, ETH_ALEN);
+
+ skb->protocol = htons(ETH_P_802_3);
+ skb_reset_mac_header(skb);
+ skb_reset_network_header(skb);
+ return 0;
+}
+
+/**
+ * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate.
+ * @fip: FCoE controller.
+ * @skb: FCoE ELS frame including FC header but no FCoE headers.
+ *
+ * Returns a non-zero error code if the frame should not be sent.
+ * Returns zero if the caller should send the frame with FCoE encapsulation.
+ *
+ * The caller must check that the length is a multiple of 4.
+ * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes).
+ */
+int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
+{
+ struct fc_frame_header *fh;
+ u16 old_xid;
+ u8 op;
+
+ if (fip->state == FIP_ST_NON_FIP)
+ return 0;
+
+ fh = (struct fc_frame_header *)skb->data;
+ op = *(u8 *)(fh + 1);
+
+ switch (op) {
+ case ELS_FLOGI:
+ old_xid = fip->flogi_oxid;
+ fip->flogi_oxid = ntohs(fh->fh_ox_id);
+ if (fip->state == FIP_ST_AUTO) {
+ if (old_xid == FC_XID_UNKNOWN)
+ fip->flogi_count = 0;
+ fip->flogi_count++;
+ if (fip->flogi_count < 3)
+ goto drop;
+ fip->map_dest = 1;
+ return 0;
+ }
+ op = FIP_DT_FLOGI;
+ break;
+ case ELS_FDISC:
+ if (ntoh24(fh->fh_s_id))
+ return 0;
+ op = FIP_DT_FDISC;
+ break;
+ case ELS_LOGO:
+ if (fip->state != FIP_ST_ENABLED)
+ return 0;
+ if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
+ return 0;
+ op = FIP_DT_LOGO;
+ break;
+ case ELS_LS_ACC:
+ if (fip->flogi_oxid == FC_XID_UNKNOWN)
+ return 0;
+ if (!ntoh24(fh->fh_s_id))
+ return 0;
+ if (fip->state == FIP_ST_AUTO)
+ return 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.
+ */
+ fip->flogi_oxid = FC_XID_UNKNOWN;
+ fc_fcoe_set_mac(fip->data_src_addr, fh->fh_s_id);
+ return 0;
+ default:
+ if (fip->state != FIP_ST_ENABLED)
+ goto drop;
+ return 0;
+ }
+ if (fcoe_ctlr_encaps(fip, op, skb))
+ goto drop;
+ fip->send(fip, skb);
+ return -EINPROGRESS;
+drop:
+ kfree_skb(skb);
+ return -EINVAL;
+}
+EXPORT_SYMBOL(fcoe_ctlr_els_send);
+
+/*
+ * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller.
+ * @fip: FCoE controller.
+ *
+ * Called with lock held.
+ *
+ * An FCF is considered old if we have missed three advertisements.
+ * That is, there have been no valid advertisement from it for three
+ * times its keep-alive period including fuzz.
+ *
+ * In addition, determine the time when an FCF selection can occur.
+ */
+static void fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
+{
+ struct fcoe_fcf *fcf;
+ struct fcoe_fcf *next;
+ unsigned long sel_time = 0;
+
+ list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
+ if (time_after(jiffies, fcf->time + fcf->fka_period * 3 +
+ msecs_to_jiffies(FIP_FCF_FUZZ * 3))) {
+ if (fip->sel_fcf == fcf)
+ fip->sel_fcf = NULL;
+ list_del(&fcf->list);
+ WARN_ON(!fip->fcf_count);
+ fip->fcf_count--;
+ kfree(fcf);
+ } else if (fcoe_ctlr_mtu_valid(fcf) &&
+ (!sel_time || time_before(sel_time, fcf->time))) {
+ sel_time = fcf->time;
+ }
+ }
+ if (sel_time) {
+ sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY);
+ fip->sel_time = sel_time;
+ if (time_before(sel_time, fip->timer.expires))
+ mod_timer(&fip->timer, sel_time);
+ } else {
+ fip->sel_time = 0;
+ }
+}
+
+/**
+ * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry.
+ * @skb: received FIP advertisement frame
+ * @fcf: resulting FCF entry.
+ *
+ * Returns zero on a valid parsed advertisement,
+ * otherwise returns non zero value.
+ */
+static int fcoe_ctlr_parse_adv(struct sk_buff *skb, struct fcoe_fcf *fcf)
+{
+ struct fip_header *fiph;
+ struct fip_desc *desc = NULL;
+ struct fip_wwn_desc *wwn;
+ struct fip_fab_desc *fab;
+ struct fip_fka_desc *fka;
+ unsigned long t;
+ size_t rlen;
+ size_t dlen;
+
+ memset(fcf, 0, sizeof(*fcf));
+ fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA);
+
+ fiph = (struct fip_header *)skb->data;
+ fcf->flags = ntohs(fiph->fip_flags);
+
+ rlen = ntohs(fiph->fip_dl_len) * 4;
+ if (rlen + sizeof(*fiph) > skb->len)
+ return -EINVAL;
+
+ desc = (struct fip_desc *)(fiph + 1);
+ while (rlen > 0) {
+ dlen = desc->fip_dlen * FIP_BPW;
+ if (dlen < sizeof(*desc) || dlen > rlen)
+ return -EINVAL;
+ switch (desc->fip_dtype) {
+ case FIP_DT_PRI:
+ if (dlen != sizeof(struct fip_pri_desc))
+ goto len_err;
+ fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri;
+ break;
+ case FIP_DT_MAC:
+ if (dlen != sizeof(struct fip_mac_desc))
+ goto len_err;
+ memcpy(fcf->fcf_mac,
+ ((struct fip_mac_desc *)desc)->fd_mac,
+ ETH_ALEN);
+ if (!is_valid_ether_addr(fcf->fcf_mac)) {
+ FIP_DBG("invalid MAC addr in FIP adv\n");
+ return -EINVAL;
+ }
+ break;
+ case FIP_DT_NAME:
+ if (dlen != sizeof(struct fip_wwn_desc))
+ goto len_err;
+ wwn = (struct fip_wwn_desc *)desc;
+ fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn);
+ break;
+ case FIP_DT_FAB:
+ if (dlen != sizeof(struct fip_fab_desc))
+ goto len_err;
+ fab = (struct fip_fab_desc *)desc;
+ fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn);
+ fcf->vfid = ntohs(fab->fd_vfid);
+ fcf->fc_map = ntoh24(fab->fd_map);
+ break;
+ case FIP_DT_FKA:
+ if (dlen != sizeof(struct fip_fka_desc))
+ goto len_err;
+ fka = (struct fip_fka_desc *)desc;
+ t = ntohl(fka->fd_fka_period);
+ if (t >= FCOE_CTLR_MIN_FKA)
+ fcf->fka_period = msecs_to_jiffies(t);
+ break;
+ case FIP_DT_MAP_OUI:
+ case FIP_DT_FCOE_SIZE:
+ case FIP_DT_FLOGI:
+ case FIP_DT_FDISC:
+ case FIP_DT_LOGO:
+ case FIP_DT_ELP:
+ default:
+ FIP_DBG("unexpected descriptor type %x in FIP adv\n",
+ desc->fip_dtype);
+ /* standard says ignore unknown descriptors >= 128 */
+ if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
+ return -EINVAL;
+ continue;
+ }
+ desc = (struct fip_desc *)((char *)desc + dlen);
+ rlen -= dlen;
+ }
+ if (!fcf->fc_map || (fcf->fc_map & 0x10000))
+ return -EINVAL;
+ if (!fcf->switch_name || !fcf->fabric_name)
+ return -EINVAL;
+ return 0;
+
+len_err:
+ FIP_DBG("FIP length error in descriptor type %x len %zu\n",
+ desc->fip_dtype, dlen);
+ return -EINVAL;
+}
+
+/**
+ * fcoe_ctlr_recv_adv() - Handle an incoming advertisement.
+ * @fip: FCoE controller.
+ * @skb: Received FIP packet.
+ */
+static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb)
+{
+ struct fcoe_fcf *fcf;
+ struct fcoe_fcf new;
+ struct fcoe_fcf *found;
+ unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV);
+ int first = 0;
+ int mtu_valid;
+
+ if (fcoe_ctlr_parse_adv(skb, &new))
+ return;
+
+ spin_lock_bh(&fip->lock);
+ first = list_empty(&fip->fcfs);
+ found = NULL;
+ list_for_each_entry(fcf, &fip->fcfs, list) {
+ if (fcf->switch_name == new.switch_name &&
+ fcf->fabric_name == new.fabric_name &&
+ fcf->fc_map == new.fc_map &&
+ compare_ether_addr(fcf->fcf_mac, new.fcf_mac) == 0) {
+ found = fcf;
+ break;
+ }
+ }
+ if (!found) {
+ if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT)
+ goto out;
+
+ fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC);
+ if (!fcf)
+ goto out;
+
+ fip->fcf_count++;
+ memcpy(fcf, &new, sizeof(new));
+ list_add(&fcf->list, &fip->fcfs);
+ } else {
+ /*
+ * Flags in advertisements are ignored once the FCF is
+ * selected. Flags in unsolicited advertisements are
+ * ignored after a usable solicited advertisement
+ * has been received.
+ */
+ if (fcf == fip->sel_fcf) {
+ fip->ctlr_ka_time -= fcf->fka_period;
+ fip->ctlr_ka_time += new.fka_period;
+ if (time_before(fip->ctlr_ka_time, fip->timer.expires))
+ mod_timer(&fip->timer, fip->ctlr_ka_time);
+ } else if (!fcoe_ctlr_fcf_usable(fcf))
+ fcf->flags = new.flags;
+ fcf->fka_period = new.fka_period;
+ memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN);
+ }
+ mtu_valid = fcoe_ctlr_mtu_valid(fcf);
+ fcf->time = jiffies;
+ FIP_DBG_LVL(found ? 2 : 1, "%s FCF for fab %llx map %x val %d\n",
+ found ? "old" : "new",
+ fcf->fabric_name, fcf->fc_map, mtu_valid);
+
+ /*
+ * If this advertisement is not solicited and our max receive size
+ * hasn't been verified, send a solicited advertisement.
+ */
+ if (!mtu_valid)
+ fcoe_ctlr_solicit(fip, fcf);
+
+ /*
+ * If its been a while since we did a solicit, and this is
+ * the first advertisement we've received, do a multicast
+ * solicitation to gather as many advertisements as we can
+ * before selection occurs.
+ */
+ if (first && time_after(jiffies, fip->sol_time + sol_tov))
+ fcoe_ctlr_solicit(fip, NULL);
+
+ /*
+ * If this is the first validated FCF, note the time and
+ * set a timer to trigger selection.
+ */
+ if (mtu_valid && !fip->sel_time && fcoe_ctlr_fcf_usable(fcf)) {
+ fip->sel_time = jiffies +
+ msecs_to_jiffies(FCOE_CTLR_START_DELAY);
+ if (!timer_pending(&fip->timer) ||
+ time_before(fip->sel_time, fip->timer.expires))
+ mod_timer(&fip->timer, fip->sel_time);
+ }
+out:
+ spin_unlock_bh(&fip->lock);
+}
+
+/**
+ * fcoe_ctlr_recv_els() - Handle an incoming FIP-encapsulated ELS frame.
+ * @fip: FCoE controller.
+ * @skb: Received FIP packet.
+ */
+static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
+{
+ struct fc_lport *lp = fip->lp;
+ struct fip_header *fiph;
+ struct fc_frame *fp;
+ struct fc_frame_header *fh = NULL;
+ struct fip_desc *desc;
+ struct fip_encaps *els;
+ struct fcoe_dev_stats *stats;
+ enum fip_desc_type els_dtype = 0;
+ u8 els_op;
+ u8 sub;
+ u8 granted_mac[ETH_ALEN] = { 0 };
+ size_t els_len = 0;
+ size_t rlen;
+ size_t dlen;
+
+ fiph = (struct fip_header *)skb->data;
+ sub = fiph->fip_subcode;
+ if (sub != FIP_SC_REQ && sub != FIP_SC_REP)
+ goto drop;
+
+ rlen = ntohs(fiph->fip_dl_len) * 4;
+ if (rlen + sizeof(*fiph) > skb->len)
+ goto drop;
+
+ desc = (struct fip_desc *)(fiph + 1);
+ while (rlen > 0) {
+ dlen = desc->fip_dlen * FIP_BPW;
+ if (dlen < sizeof(*desc) || dlen > rlen)
+ goto drop;
+ switch (desc->fip_dtype) {
+ case FIP_DT_MAC:
+ if (dlen != sizeof(struct fip_mac_desc))
+ goto len_err;
+ memcpy(granted_mac,
+ ((struct fip_mac_desc *)desc)->fd_mac,
+ ETH_ALEN);
+ if (!is_valid_ether_addr(granted_mac)) {
+ FIP_DBG("invalid MAC addrs in FIP ELS\n");
+ goto drop;
+ }
+ break;
+ case FIP_DT_FLOGI:
+ case FIP_DT_FDISC:
+ case FIP_DT_LOGO:
+ case FIP_DT_ELP:
+ if (fh)
+ goto drop;
+ if (dlen < sizeof(*els) + sizeof(*fh) + 1)
+ goto len_err;
+ els_len = dlen - sizeof(*els);
+ els = (struct fip_encaps *)desc;
+ fh = (struct fc_frame_header *)(els + 1);
+ els_dtype = desc->fip_dtype;
+ break;
+ default:
+ FIP_DBG("unexpected descriptor type %x "
+ "in FIP adv\n", desc->fip_dtype);
+ /* standard says ignore unknown descriptors >= 128 */
+ if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
+ goto drop;
+ continue;
+ }
+ desc = (struct fip_desc *)((char *)desc + dlen);
+ rlen -= dlen;
+ }
+
+ if (!fh)
+ goto drop;
+ els_op = *(u8 *)(fh + 1);
+
+ if (els_dtype == FIP_DT_FLOGI && sub == FIP_SC_REP &&
+ fip->flogi_oxid == ntohs(fh->fh_ox_id) &&
+ els_op == ELS_LS_ACC && is_valid_ether_addr(granted_mac)) {
+ fip->flogi_oxid = FC_XID_UNKNOWN;
+ fip->update_mac(fip, fip->data_src_addr, granted_mac);
+ memcpy(fip->data_src_addr, granted_mac, ETH_ALEN);
+ }
+
+ /*
+ * Convert skb into an fc_frame containing only the ELS.
+ */
+ skb_pull(skb, (u8 *)fh - skb->data);
+ skb_trim(skb, els_len);
+ fp = (struct fc_frame *)skb;
+ fc_frame_init(fp);
+ fr_sof(fp) = FC_SOF_I3;
+ fr_eof(fp) = FC_EOF_T;
+ fr_dev(fp) = lp;
+
+ stats = fc_lport_get_stats(lp);
+ stats->RxFrames++;
+ stats->RxWords += skb->len / FIP_BPW;
+
+ fc_exch_recv(lp, lp->emp, fp);
+ return;
+
+len_err:
+ FIP_DBG("FIP length error in descriptor type %x len %zu\n",
+ desc->fip_dtype, dlen);
+drop:
+ kfree_skb(skb);
+}
+
+/**
+ * fcoe_ctlr_recv_els() - Handle an incoming link reset frame.
+ * @fip: FCoE controller.
+ * @fh: Received FIP header.
+ *
+ * There may be multiple VN_Port descriptors.
+ * The overall length has already been checked.
+ */
+static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip,
+ struct fip_header *fh)
+{
+ struct fip_desc *desc;
+ struct fip_mac_desc *mp;
+ struct fip_wwn_desc *wp;
+ struct fip_vn_desc *vp;
+ size_t rlen;
+ size_t dlen;
+ struct fcoe_fcf *fcf = fip->sel_fcf;
+ struct fc_lport *lp = fip->lp;
+ u32 desc_mask;
+
+ FIP_DBG("Clear Virtual Link received\n");
+ if (!fcf)
+ return;
+ if (!fcf || !fc_host_port_id(lp->host))
+ return;
+
+ /*
+ * mask of required descriptors. Validating each one clears its bit.
+ */
+ desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) | BIT(FIP_DT_VN_ID);
+
+ rlen = ntohs(fh->fip_dl_len) * FIP_BPW;
+ desc = (struct fip_desc *)(fh + 1);
+ while (rlen >= sizeof(*desc)) {
+ dlen = desc->fip_dlen * FIP_BPW;
+ if (dlen > rlen)
+ return;
+ switch (desc->fip_dtype) {
+ case FIP_DT_MAC:
+ mp = (struct fip_mac_desc *)desc;
+ if (dlen < sizeof(*mp))
+ return;
+ if (compare_ether_addr(mp->fd_mac, fcf->fcf_mac))
+ return;
+ desc_mask &= ~BIT(FIP_DT_MAC);
+ break;
+ case FIP_DT_NAME:
+ wp = (struct fip_wwn_desc *)desc;
+ if (dlen < sizeof(*wp))
+ return;
+ if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name)
+ return;
+ desc_mask &= ~BIT(FIP_DT_NAME);
+ break;
+ case FIP_DT_VN_ID:
+ vp = (struct fip_vn_desc *)desc;
+ if (dlen < sizeof(*vp))
+ return;
+ if (compare_ether_addr(vp->fd_mac,
+ fip->data_src_addr) == 0 &&
+ get_unaligned_be64(&vp->fd_wwpn) == lp->wwpn &&
+ ntoh24(vp->fd_fc_id) == fc_host_port_id(lp->host))
+ desc_mask &= ~BIT(FIP_DT_VN_ID);
+ break;
+ default:
+ /* standard says ignore unknown descriptors >= 128 */
+ if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
+ return;
+ break;
+ }
+ desc = (struct fip_desc *)((char *)desc + dlen);
+ rlen -= dlen;
+ }
+
+ /*
+ * reset only if all required descriptors were present and valid.
+ */
+ if (desc_mask) {
+ FIP_DBG("missing descriptors mask %x\n", desc_mask);
+ } else {
+ FIP_DBG("performing Clear Virtual Link\n");
+ fcoe_ctlr_reset(fip, FIP_ST_ENABLED);
+ }
+}
+
+/**
+ * fcoe_ctlr_recv() - Receive a FIP frame.
+ * @fip: FCoE controller.
+ * @skb: Received FIP packet.
+ *
+ * This is called from NET_RX_SOFTIRQ.
+ */
+void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
+{
+ spin_lock_bh(&fip->fip_recv_list.lock);
+ __skb_queue_tail(&fip->fip_recv_list, skb);
+ spin_unlock_bh(&fip->fip_recv_list.lock);
+ schedule_work(&fip->recv_work);
+}
+EXPORT_SYMBOL(fcoe_ctlr_recv);
+
+/**
+ * fcoe_ctlr_recv_handler() - Receive a FIP frame.
+ * @fip: FCoE controller.
+ * @skb: Received FIP packet.
+ *
+ * Returns non-zero if the frame is dropped.
+ */
+static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb)
+{
+ struct fip_header *fiph;
+ struct ethhdr *eh;
+ enum fip_state state;
+ u16 op;
+ u8 sub;
+
+ if (skb_linearize(skb))
+ goto drop;
+ if (skb->len < sizeof(*fiph))
+ goto drop;
+ eh = eth_hdr(skb);
+ if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) &&
+ compare_ether_addr(eh->h_dest, FIP_ALL_ENODE_MACS))
+ goto drop;
+ fiph = (struct fip_header *)skb->data;
+ op = ntohs(fiph->fip_op);
+ sub = fiph->fip_subcode;
+
+ FIP_DBG_LVL(2, "ver %x op %x/%x dl %x fl %x\n",
+ FIP_VER_DECAPS(fiph->fip_ver), op, sub,
+ ntohs(fiph->fip_dl_len), ntohs(fiph->fip_flags));
+
+ if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER)
+ goto drop;
+ if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len)
+ goto drop;
+
+ spin_lock_bh(&fip->lock);
+ state = fip->state;
+ if (state == FIP_ST_AUTO) {
+ fip->map_dest = 0;
+ fip->state = FIP_ST_ENABLED;
+ state = FIP_ST_ENABLED;
+ FIP_DBG("using FIP mode\n");
+ }
+ spin_unlock_bh(&fip->lock);
+ if (state != FIP_ST_ENABLED)
+ goto drop;
+
+ if (op == FIP_OP_LS) {
+ fcoe_ctlr_recv_els(fip, skb); /* consumes skb */
+ return 0;
+ }
+ if (op == FIP_OP_DISC && sub == FIP_SC_ADV)
+ fcoe_ctlr_recv_adv(fip, skb);
+ else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK)
+ fcoe_ctlr_recv_clr_vlink(fip, fiph);
+ kfree_skb(skb);
+ return 0;
+drop:
+ kfree_skb(skb);
+ return -1;
+}
+
+/**
+ * fcoe_ctlr_select() - Select the best FCF, if possible.
+ * @fip: FCoE controller.
+ *
+ * If there are conflicting advertisements, no FCF can be chosen.
+ *
+ * Called with lock held.
+ */
+static void fcoe_ctlr_select(struct fcoe_ctlr *fip)
+{
+ struct fcoe_fcf *fcf;
+ struct fcoe_fcf *best = NULL;
+
+ list_for_each_entry(fcf, &fip->fcfs, list) {
+ FIP_DBG("consider FCF for fab %llx VFID %d map %x val %d\n",
+ fcf->fabric_name, fcf->vfid,
+ fcf->fc_map, fcoe_ctlr_mtu_valid(fcf));
+ if (!fcoe_ctlr_fcf_usable(fcf)) {
+ FIP_DBG("FCF for fab %llx map %x %svalid %savailable\n",
+ fcf->fabric_name, fcf->fc_map,
+ (fcf->flags & FIP_FL_SOL) ? "" : "in",
+ (fcf->flags & FIP_FL_AVAIL) ? "" : "un");
+ continue;
+ }
+ if (!best) {
+ best = fcf;
+ continue;
+ }
+ if (fcf->fabric_name != best->fabric_name ||
+ fcf->vfid != best->vfid ||
+ fcf->fc_map != best->fc_map) {
+ FIP_DBG("conflicting fabric, VFID, or FC-MAP\n");
+ return;
+ }
+ if (fcf->pri < best->pri)
+ best = fcf;
+ }
+ fip->sel_fcf = best;
+}
+
+/**
+ * fcoe_ctlr_timeout() - FIP timer function.
+ * @arg: &fcoe_ctlr pointer.
+ *
+ * Ages FCFs. Triggers FCF selection if possible. Sends keep-alives.
+ */
+static void fcoe_ctlr_timeout(unsigned long arg)
+{
+ struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg;
+ struct fcoe_fcf *sel;
+ struct fcoe_fcf *fcf;
+ unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD);
+ DECLARE_MAC_BUF(buf);
+ u8 send_ctlr_ka;
+ u8 send_port_ka;
+
+ spin_lock_bh(&fip->lock);
+ if (fip->state == FIP_ST_DISABLED) {
+ spin_unlock_bh(&fip->lock);
+ return;
+ }
+
+ fcf = fip->sel_fcf;
+ fcoe_ctlr_age_fcfs(fip);
+
+ sel = fip->sel_fcf;
+ if (!sel && fip->sel_time && time_after_eq(jiffies, fip->sel_time)) {
+ fcoe_ctlr_select(fip);
+ sel = fip->sel_fcf;
+ fip->sel_time = 0;
+ }
+
+ if (sel != fcf) {
+ fcf = sel; /* the old FCF may have been freed */
+ if (sel) {
+ printk(KERN_INFO "host%d: FIP selected "
+ "Fibre-Channel Forwarder MAC %s\n",
+ fip->lp->host->host_no,
+ print_mac(buf, sel->fcf_mac));
+ memcpy(fip->dest_addr, sel->fcf_mac, ETH_ALEN);
+ fip->port_ka_time = jiffies +
+ msecs_to_jiffies(FIP_VN_KA_PERIOD);
+ fip->ctlr_ka_time = jiffies + sel->fka_period;
+ fip->link = 1;
+ } else {
+ printk(KERN_NOTICE "host%d: "
+ "FIP Fibre-Channel Forwarder timed out. "
+ "Starting FCF discovery.\n",
+ fip->lp->host->host_no);
+ fip->link = 0;
+ }
+ schedule_work(&fip->link_work);
+ }
+
+ send_ctlr_ka = 0;
+ send_port_ka = 0;
+ if (sel) {
+ if (time_after_eq(jiffies, fip->ctlr_ka_time)) {
+ fip->ctlr_ka_time = jiffies + sel->fka_period;
+ send_ctlr_ka = 1;
+ }
+ if (time_after(next_timer, fip->ctlr_ka_time))
+ next_timer = fip->ctlr_ka_time;
+
+ if (time_after_eq(jiffies, fip->port_ka_time)) {
+ fip->port_ka_time += jiffies +
+ msecs_to_jiffies(FIP_VN_KA_PERIOD);
+ send_port_ka = 1;
+ }
+ if (time_after(next_timer, fip->port_ka_time))
+ next_timer = fip->port_ka_time;
+ mod_timer(&fip->timer, next_timer);
+ } else if (fip->sel_time) {
+ next_timer = fip->sel_time +
+ msecs_to_jiffies(FCOE_CTLR_START_DELAY);
+ mod_timer(&fip->timer, next_timer);
+ }
+ spin_unlock_bh(&fip->lock);
+
+ if (send_ctlr_ka)
+ fcoe_ctlr_send_keep_alive(fip, 0, fip->ctl_src_addr);
+ if (send_port_ka)
+ fcoe_ctlr_send_keep_alive(fip, 1, fip->data_src_addr);
+}
+
+/**
+ * fcoe_ctlr_link_work() - worker thread function for link changes.
+ * @work: pointer to link_work member inside &fcoe_ctlr.
+ *
+ * See if the link status has changed and if so, report it.
+ *
+ * This is here because fc_linkup() and fc_linkdown() must not
+ * be called from the timer directly, since they use a mutex.
+ */
+static void fcoe_ctlr_link_work(struct work_struct *work)
+{
+ struct fcoe_ctlr *fip;
+ int link;
+ int last_link;
+
+ fip = container_of(work, struct fcoe_ctlr, link_work);
+ spin_lock_bh(&fip->lock);
+ last_link = fip->last_link;
+ link = fip->link;
+ fip->last_link = link;
+ spin_unlock_bh(&fip->lock);
+
+ if (last_link != link) {
+ if (link)
+ fc_linkup(fip->lp);
+ else
+ fcoe_ctlr_reset(fip, FIP_ST_LINK_WAIT);
+ }
+}
+
+/**
+ * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames.
+ * @recv_work: pointer to recv_work member inside &fcoe_ctlr.
+ */
+static void fcoe_ctlr_recv_work(struct work_struct *recv_work)
+{
+ struct fcoe_ctlr *fip;
+ struct sk_buff *skb;
+
+ fip = container_of(recv_work, struct fcoe_ctlr, recv_work);
+ spin_lock_bh(&fip->fip_recv_list.lock);
+ while ((skb = __skb_dequeue(&fip->fip_recv_list))) {
+ spin_unlock_bh(&fip->fip_recv_list.lock);
+ fcoe_ctlr_recv_handler(fip, skb);
+ spin_lock_bh(&fip->fip_recv_list.lock);
+ }
+ spin_unlock_bh(&fip->fip_recv_list.lock);
+}
+
+/**
+ * fcoe_ctlr_recv_flogi() - snoop Pre-FIP receipt of FLOGI response or request.
+ * @fip: FCoE controller.
+ * @fp: FC frame.
+ * @sa: Ethernet source MAC address from received FCoE frame.
+ *
+ * Snoop potential response to FLOGI or even incoming FLOGI.
+ *
+ * The caller has checked that we are waiting for login as indicated
+ * by fip->flogi_oxid != FC_XID_UNKNOWN.
+ *
+ * The caller is responsible for freeing the frame.
+ *
+ * Return non-zero if the frame should not be delivered to libfc.
+ */
+int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_frame *fp, u8 *sa)
+{
+ struct fc_frame_header *fh;
+ u8 op;
+ u8 mac[ETH_ALEN];
+
+ fh = fc_frame_header_get(fp);
+ if (fh->fh_type != FC_TYPE_ELS)
+ return 0;
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
+ fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
+
+ spin_lock_bh(&fip->lock);
+ if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) {
+ spin_unlock_bh(&fip->lock);
+ return -EINVAL;
+ }
+ fip->state = FIP_ST_NON_FIP;
+ FIP_DBG("received FLOGI LS_ACC using non-FIP mode\n");
+
+ /*
+ * 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)) {
+ fip->map_dest = 1;
+ } else {
+ memcpy(fip->dest_addr, sa, ETH_ALEN);
+ fip->map_dest = 0;
+ }
+ fip->flogi_oxid = FC_XID_UNKNOWN;
+ memcpy(mac, fip->data_src_addr, ETH_ALEN);
+ fc_fcoe_set_mac(fip->data_src_addr, fh->fh_d_id);
+ spin_unlock_bh(&fip->lock);
+
+ fip->update_mac(fip, mac, fip->data_src_addr);
+ } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
+ /*
+ * Save source MAC for point-to-point responses.
+ */
+ spin_lock_bh(&fip->lock);
+ if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) {
+ memcpy(fip->dest_addr, sa, ETH_ALEN);
+ fip->map_dest = 0;
+ if (fip->state == FIP_ST_NON_FIP)
+ FIP_DBG("received FLOGI REQ, "
+ "using non-FIP mode\n");
+ fip->state = FIP_ST_NON_FIP;
+ }
+ spin_unlock_bh(&fip->lock);
+ }
+ return 0;
+}
+EXPORT_SYMBOL(fcoe_ctlr_recv_flogi);
+
/**
* fcoe_wwn_from_mac() - Converts 48-bit IEEE MAC address to 64-bit FC WWN.
* @mac: mac address
diff --git a/include/scsi/libfcoe.h b/include/scsi/libfcoe.h
index d07ebe6..666cc13 100644
--- a/include/scsi/libfcoe.h
+++ b/include/scsi/libfcoe.h
@@ -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 *);