[SCSI] fcoe: Fibre Channel over Ethernet
Encapsulation protocol for running Fibre Channel over Ethernet interfaces.
Creates virtual Fibre Channel host adapters using libfc.
This layer is the LLD to the scsi-ml. It allocates the Scsi_Host, utilizes
libfc for Fibre Channel protocol processing and interacts with netdev to
send/receive Ethernet packets.
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/fcoe/libfcoe.c b/drivers/scsi/fcoe/libfcoe.c
new file mode 100644
index 0000000..1cb549c
--- /dev/null
+++ b/drivers/scsi/fcoe/libfcoe.c
@@ -0,0 +1,1510 @@
+/*
+ * 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/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.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/kthread.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>
+
+#include <scsi/libfc.h>
+#include <scsi/fc_frame.h>
+#include <scsi/libfcoe.h>
+#include <scsi/fc_transport_fcoe.h>
+
+static int debug_fcoe;
+
+#define FCOE_MAX_QUEUE_DEPTH 256
+
+/* destination address mode */
+#define FCOE_GW_ADDR_MODE 0x00
+#define FCOE_FCOUI_ADDR_MODE 0x01
+
+#define FCOE_WORD_TO_BYTE 4
+
+MODULE_AUTHOR("Open-FCoE.org");
+MODULE_DESCRIPTION("FCoE");
+MODULE_LICENSE("GPL");
+
+/* fcoe host list */
+LIST_HEAD(fcoe_hostlist);
+DEFINE_RWLOCK(fcoe_hostlist_lock);
+DEFINE_TIMER(fcoe_timer, NULL, 0, 0);
+struct fcoe_percpu_s *fcoe_percpu[NR_CPUS];
+
+
+/* Function Prototyes */
+static int fcoe_check_wait_queue(struct fc_lport *);
+static void fcoe_insert_wait_queue_head(struct fc_lport *, struct sk_buff *);
+static void fcoe_insert_wait_queue(struct fc_lport *, struct sk_buff *);
+static void fcoe_recv_flogi(struct fcoe_softc *, struct fc_frame *, u8 *);
+#ifdef CONFIG_HOTPLUG_CPU
+static int fcoe_cpu_callback(struct notifier_block *, ulong, void *);
+#endif /* CONFIG_HOTPLUG_CPU */
+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,
+};
+
+
+#ifdef CONFIG_HOTPLUG_CPU
+static struct notifier_block fcoe_cpu_notifier = {
+ .notifier_call = fcoe_cpu_callback,
+};
+
+/**
+ * fcoe_create_percpu_data - creates the associated cpu data
+ * @cpu: index for the cpu where fcoe cpu data will be created
+ *
+ * create percpu stats block, from cpu add notifier
+ *
+ * Returns: none
+ **/
+static void fcoe_create_percpu_data(int cpu)
+{
+ struct fc_lport *lp;
+ struct fcoe_softc *fc;
+
+ write_lock_bh(&fcoe_hostlist_lock);
+ list_for_each_entry(fc, &fcoe_hostlist, list) {
+ lp = fc->lp;
+ if (lp->dev_stats[cpu] == NULL)
+ lp->dev_stats[cpu] =
+ kzalloc(sizeof(struct fcoe_dev_stats),
+ GFP_KERNEL);
+ }
+ write_unlock_bh(&fcoe_hostlist_lock);
+}
+
+/**
+ * fcoe_destroy_percpu_data - destroys the associated cpu data
+ * @cpu: index for the cpu where fcoe cpu data will destroyed
+ *
+ * destroy percpu stats block called by cpu add/remove notifier
+ *
+ * Retuns: none
+ **/
+static void fcoe_destroy_percpu_data(int cpu)
+{
+ struct fc_lport *lp;
+ struct fcoe_softc *fc;
+
+ write_lock_bh(&fcoe_hostlist_lock);
+ list_for_each_entry(fc, &fcoe_hostlist, list) {
+ lp = fc->lp;
+ kfree(lp->dev_stats[cpu]);
+ lp->dev_stats[cpu] = NULL;
+ }
+ write_unlock_bh(&fcoe_hostlist_lock);
+}
+
+/**
+ * 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 int cpu = (unsigned long)hcpu;
+
+ switch (action) {
+ case CPU_ONLINE:
+ fcoe_create_percpu_data(cpu);
+ break;
+ case CPU_DEAD:
+ fcoe_destroy_percpu_data(cpu);
+ break;
+ default:
+ break;
+ }
+ return NOTIFY_OK;
+}
+#endif /* CONFIG_HOTPLUG_CPU */
+
+/**
+ * foce_rcv - this is the fcoe receive function called by NET_RX_SOFTIRQ
+ * @skb: the receive skb
+ * @dev: associated net device
+ * @ptype: context
+ * @odldev: last device
+ *
+ * this function will receive the packet and build fc frame and pass it up
+ *
+ * Returns: 0 for success
+ **/
+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 fcoe_dev_stats *stats;
+ struct fc_frame_header *fh;
+ unsigned short oxid;
+ int cpu_idx;
+ struct fcoe_percpu_s *fps;
+
+ fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type);
+ lp = fc->lp;
+ if (unlikely(lp == NULL)) {
+ FC_DBG("cannot find hba structure");
+ goto err2;
+ }
+
+ 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;
+ cpu_idx = 0;
+#ifdef CONFIG_SMP
+ /*
+ * The incoming frame exchange id(oxid) is ANDed with num of online
+ * cpu bits to get cpu_idx and then this cpu_idx is used for selecting
+ * a per cpu kernel thread from fcoe_percpu. In case the cpu is
+ * offline or no kernel thread for derived cpu_idx then cpu_idx is
+ * initialize to first online cpu index.
+ */
+ cpu_idx = oxid & (num_online_cpus() - 1);
+ if (!fcoe_percpu[cpu_idx] || !cpu_online(cpu_idx))
+ cpu_idx = first_cpu(cpu_online_map);
+#endif
+ fps = fcoe_percpu[cpu_idx];
+
+ spin_lock_bh(&fps->fcoe_rx_list.lock);
+ __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:
+#ifdef CONFIG_SMP
+ stats = lp->dev_stats[smp_processor_id()];
+#else
+ stats = lp->dev_stats[0];
+#endif
+ if (stats)
+ stats->ErrorFrames++;
+
+err2:
+ kfree_skb(skb);
+ return -1;
+}
+EXPORT_SYMBOL_GPL(fcoe_rcv);
+
+/**
+ * fcoe_start_io - pass to netdev to start xmit for fcoe
+ * @skb: the skb to be xmitted
+ *
+ * Returns: 0 for success
+ **/
+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;
+}
+
+/**
+ * fcoe_get_paged_crc_eof - in case we need alloc a page for crc_eof
+ * @skb: the skb to be xmitted
+ * @tlen: total len
+ *
+ * Returns: 0 for success
+ **/
+static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
+{
+ struct fcoe_percpu_s *fps;
+ struct page *page;
+ int cpu_idx;
+
+ cpu_idx = get_cpu();
+ fps = fcoe_percpu[cpu_idx];
+ page = fps->crc_eof_page;
+ if (!page) {
+ page = alloc_page(GFP_ATOMIC);
+ if (!page) {
+ put_cpu();
+ return -ENOMEM;
+ }
+ fps->crc_eof_page = page;
+ WARN_ON(fps->crc_eof_offset != 0);
+ }
+
+ get_page(page);
+ skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
+ fps->crc_eof_offset, tlen);
+ skb->len += tlen;
+ skb->data_len += tlen;
+ skb->truesize += tlen;
+ fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);
+
+ if (fps->crc_eof_offset >= PAGE_SIZE) {
+ fps->crc_eof_page = NULL;
+ fps->crc_eof_offset = 0;
+ put_page(page);
+ }
+ put_cpu();
+ return 0;
+}
+
+/**
+ * fcoe_fc_crc - calculates FC CRC in this fcoe skb
+ * @fp: the fc_frame containg data to be checksummed
+ *
+ * This uses crc32() to calculate the crc for fc frame
+ * Return : 32 bit crc
+ *
+ **/
+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;
+}
+EXPORT_SYMBOL_GPL(fcoe_fc_crc);
+
+/**
+ * fcoe_xmit - FCoE frame transmit function
+ * @lp: the associated local port
+ * @fp: the fc_frame to be transmitted
+ *
+ * Return : 0 for success
+ *
+ **/
+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 */
+ int flogi_in_progress = 0;
+ struct fcoe_softc *fc;
+ u8 sof, eof;
+ struct fcoe_hdr *hp;
+
+ WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
+
+ fc = fcoe_softc(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);
+ 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)) {
+ skb->ip_summed = CHECKSUM_COMPLETE;
+ 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)) {
+ kfree(skb);
+ return -ENOMEM;
+ }
+ frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
+ cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
+ + frag->page_offset;
+ } else {
+ cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
+ }
+
+ memset(cp, 0, sizeof(*cp));
+ cp->fcoe_eof = eof;
+ cp->fcoe_crc32 = cpu_to_le32(~crc);
+
+ if (skb_is_nonlinear(skb)) {
+ kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ);
+ cp = NULL;
+ }
+
+ /* adjust skb netowrk/transport offsets to match mac/fcoe/fc */
+ skb_push(skb, elen + hlen);
+ skb_reset_mac_header(skb);
+ skb_reset_network_header(skb);
+ skb->mac_len = elen;
+ skb->protocol = htons(ETH_P_802_3);
+ skb->dev = fc->real_dev;
+
+ /* 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)
+ fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id);
+ else
+ /* insert GW address */
+ memcpy(eh->h_dest, fc->dest_addr, ETH_ALEN);
+
+ if (unlikely(flogi_in_progress))
+ memcpy(eh->h_source, fc->ctl_src_addr, ETH_ALEN);
+ else
+ memcpy(eh->h_source, fc->data_src_addr, ETH_ALEN);
+
+ hp = (struct fcoe_hdr *)(eh + 1);
+ memset(hp, 0, sizeof(*hp));
+ if (FC_FCOE_VER)
+ FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
+ hp->fcoe_sof = sof;
+
+ /* update tx stats: regardless if LLD fails */
+ stats = lp->dev_stats[smp_processor_id()];
+ if (stats) {
+ stats->TxFrames++;
+ stats->TxWords += wlen;
+ }
+
+ /* 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) {
+ fcoe_insert_wait_queue(lp, skb);
+ if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
+ fc_pause(lp);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fcoe_xmit);
+
+/*
+ * fcoe_percpu_receive_thread - recv thread per cpu
+ * @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;
+
+ set_user_nice(current, 19);
+
+ 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;
+ }
+
+ stats = lp->dev_stats[smp_processor_id()];
+
+ 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 (unlikely(fc->flogi_progress))
+ mac = eth_hdr(skb)->h_source;
+
+ if (skb_is_nonlinear(skb))
+ skb_linearize(skb); /* not ideal */
+
+ /*
+ * Frame length checks and setting up the header pointers
+ * was done in fcoe_rcv already.
+ */
+ hp = (struct fcoe_hdr *) skb_network_header(skb);
+ fh = (struct fc_frame_header *) skb_transport_header(skb);
+
+ if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
+ if (stats) {
+ if (stats->ErrorFrames < 5)
+ FC_DBG("unknown FCoE version %x",
+ FC_FCOE_DECAPS_VER(hp));
+ stats->ErrorFrames++;
+ }
+ kfree_skb(skb);
+ continue;
+ }
+
+ skb_pull(skb, sizeof(struct fcoe_hdr));
+ fr_len = skb->len - sizeof(struct fcoe_crc_eof);
+
+ if (stats) {
+ stats->RxFrames++;
+ stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
+ }
+
+ 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.
+ */
+ if (lp->crc_offload)
+ 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;
+ }
+ /* non flogi and non data exchanges are handled here */
+ if (unlikely(fc->flogi_progress))
+ fcoe_recv_flogi(fc, fp, mac);
+ 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:
+ *
+ * This checks the pending queue length for fcoe and put fcoe to be paused state
+ * if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the
+ * fcoe_hostlist.
+ *
+ * Returns: 0 for success
+ **/
+void fcoe_watchdog(ulong vp)
+{
+ struct fc_lport *lp;
+ struct fcoe_softc *fc;
+ int paused = 0;
+
+ read_lock(&fcoe_hostlist_lock);
+ list_for_each_entry(fc, &fcoe_hostlist, list) {
+ lp = fc->lp;
+ if (lp) {
+ if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
+ paused = 1;
+ if (fcoe_check_wait_queue(lp) < FCOE_MAX_QUEUE_DEPTH) {
+ if (paused)
+ fc_unpause(lp);
+ }
+ }
+ }
+ read_unlock(&fcoe_hostlist_lock);
+
+ fcoe_timer.expires = jiffies + (1 * HZ);
+ add_timer(&fcoe_timer);
+}
+
+
+/**
+ * fcoe_check_wait_queue - put the skb into fcoe pending xmit queue
+ * @lp: the fc_port for this skb
+ * @skb: the associated skb to be xmitted
+ *
+ * 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
+ * transmitted, return 0 if a error occurs, then restore wait_queue and
+ * try again later.
+ *
+ * The wait_queue is used when the skb transmit fails. skb will go
+ * in the wait_queue which will be emptied by the time function OR
+ * by the next skb transmit.
+ *
+ * Returns: 0 for success
+ **/
+static int fcoe_check_wait_queue(struct fc_lport *lp)
+{
+ int rc, unpause = 0;
+ int paused = 0;
+ struct sk_buff *skb;
+ struct fcoe_softc *fc;
+
+ fc = fcoe_softc(lp);
+ spin_lock_bh(&fc->fcoe_pending_queue.lock);
+
+ /*
+ * is this interface paused?
+ */
+ if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
+ paused = 1;
+ if (fc->fcoe_pending_queue.qlen) {
+ while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) {
+ spin_unlock_bh(&fc->fcoe_pending_queue.lock);
+ rc = fcoe_start_io(skb);
+ if (rc) {
+ fcoe_insert_wait_queue_head(lp, skb);
+ return rc;
+ }
+ spin_lock_bh(&fc->fcoe_pending_queue.lock);
+ }
+ if (fc->fcoe_pending_queue.qlen < FCOE_MAX_QUEUE_DEPTH)
+ unpause = 1;
+ }
+ spin_unlock_bh(&fc->fcoe_pending_queue.lock);
+ if ((unpause) && (paused))
+ fc_unpause(lp);
+ return fc->fcoe_pending_queue.qlen;
+}
+
+/**
+ * fcoe_insert_wait_queue_head - puts skb to fcoe pending queue head
+ * @lp: the fc_port for this skb
+ * @skb: the associated skb to be xmitted
+ *
+ * Returns: none
+ **/
+static void fcoe_insert_wait_queue_head(struct fc_lport *lp,
+ struct sk_buff *skb)
+{
+ struct fcoe_softc *fc;
+
+ fc = fcoe_softc(lp);
+ spin_lock_bh(&fc->fcoe_pending_queue.lock);
+ __skb_queue_head(&fc->fcoe_pending_queue, skb);
+ spin_unlock_bh(&fc->fcoe_pending_queue.lock);
+}
+
+/**
+ * fcoe_insert_wait_queue - put the skb into fcoe pending queue tail
+ * @lp: the fc_port for this skb
+ * @skb: the associated skb to be xmitted
+ *
+ * Returns: none
+ **/
+static void fcoe_insert_wait_queue(struct fc_lport *lp,
+ struct sk_buff *skb)
+{
+ struct fcoe_softc *fc;
+
+ fc = fcoe_softc(lp);
+ spin_lock_bh(&fc->fcoe_pending_queue.lock);
+ __skb_queue_tail(&fc->fcoe_pending_queue, skb);
+ spin_unlock_bh(&fc->fcoe_pending_queue.lock);
+}
+
+/**
+ * fcoe_dev_setup - setup link change notification interface
+ *
+ **/
+static void fcoe_dev_setup(void)
+{
+ /*
+ * here setup a interface specific wd time to
+ * monitor the link state
+ */
+ register_netdevice_notifier(&fcoe_notifier);
+}
+
+/**
+ * fcoe_dev_setup - cleanup link change notification interface
+ **/
+static void fcoe_dev_cleanup(void)
+{
+ unregister_netdevice_notifier(&fcoe_notifier);
+}
+
+/**
+ * fcoe_device_notification - netdev event notification callback
+ * @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
+ **/
+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;
+ u16 new_status;
+ 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;
+ break;
+ }
+ }
+ read_unlock(&fcoe_hostlist_lock);
+ if (lp == NULL) {
+ rc = NOTIFY_DONE;
+ goto out;
+ }
+
+ new_status = lp->link_status;
+ switch (event) {
+ case NETDEV_DOWN:
+ case NETDEV_GOING_DOWN:
+ new_status &= ~FC_LINK_UP;
+ break;
+ case NETDEV_UP:
+ case NETDEV_CHANGE:
+ new_status &= ~FC_LINK_UP;
+ if (!fcoe_link_ok(lp))
+ new_status |= FC_LINK_UP;
+ 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);
+ new_status &= ~FC_LINK_UP;
+ if (!fcoe_link_ok(lp))
+ new_status |= FC_LINK_UP;
+ break;
+ case NETDEV_REGISTER:
+ break;
+ default:
+ FC_DBG("unknown event %ld call", event);
+ }
+ if (lp->link_status != new_status) {
+ if ((new_status & FC_LINK_UP) == FC_LINK_UP)
+ fc_linkup(lp);
+ else {
+ stats = lp->dev_stats[smp_processor_id()];
+ if (stats)
+ stats->LinkFailureCount++;
+ fc_linkdown(lp);
+ fcoe_clean_pending_queue(lp);
+ }
+ }
+out:
+ return rc;
+}
+
+/**
+ * fcoe_if_to_netdev - parse a name buffer to get netdev
+ * @ifname: fixed array for output parsed ifname
+ * @buffer: incoming buffer to be copied
+ *
+ * Returns: NULL or ptr to netdeive
+ **/
+static struct net_device *fcoe_if_to_netdev(const char *buffer)
+{
+ char *cp;
+ char ifname[IFNAMSIZ + 2];
+
+ if (buffer) {
+ strlcpy(ifname, buffer, IFNAMSIZ);
+ cp = ifname + strlen(ifname);
+ while (--cp >= ifname && *cp == '\n')
+ *cp = '\0';
+ return dev_get_by_name(&init_net, ifname);
+ }
+ return NULL;
+}
+
+/**
+ * fcoe_netdev_to_module_owner - finds out the nic drive moddule of the netdev
+ * @netdev: the target netdev
+ *
+ * Returns: ptr to the struct module, NULL for failure
+ **/
+static struct module *fcoe_netdev_to_module_owner(
+ const struct net_device *netdev)
+{
+ struct device *dev;
+
+ if (!netdev)
+ return NULL;
+
+ dev = netdev->dev.parent;
+ if (!dev)
+ return NULL;
+
+ if (!dev->driver)
+ return NULL;
+
+ return dev->driver->owner;
+}
+
+/**
+ * fcoe_ethdrv_get - holds the nic driver module by try_module_get() for
+ * the corresponding netdev.
+ * @netdev: the target netdev
+ *
+ * Returns: 0 for succsss
+ **/
+static int fcoe_ethdrv_get(const struct net_device *netdev)
+{
+ struct module *owner;
+
+ owner = fcoe_netdev_to_module_owner(netdev);
+ if (owner) {
+ printk(KERN_DEBUG "foce:hold driver module %s for %s\n",
+ owner->name, netdev->name);
+ return try_module_get(owner);
+ }
+ return -ENODEV;
+}
+
+/**
+ * fcoe_ethdrv_get - releases the nic driver module by module_put for
+ * the corresponding netdev.
+ * @netdev: the target netdev
+ *
+ * Returns: 0 for succsss
+ **/
+static int fcoe_ethdrv_put(const struct net_device *netdev)
+{
+ struct module *owner;
+
+ owner = fcoe_netdev_to_module_owner(netdev);
+ if (owner) {
+ printk(KERN_DEBUG "foce:release driver module %s for %s\n",
+ owner->name, netdev->name);
+ module_put(owner);
+ return 0;
+ }
+ return -ENODEV;
+}
+
+/**
+ * fcoe_destroy- handles the destroy from sysfs
+ * @buffer: expcted to be a eth if name
+ * @kp: associated kernel param
+ *
+ * Returns: 0 for success
+ **/
+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;
+ }
+ /* pass to transport */
+ rc = fcoe_transport_release(netdev);
+ if (rc) {
+ printk(KERN_ERR "fcoe: fcoe_transport_release(%s) failed\n",
+ netdev->name);
+ rc = -EIO;
+ goto out_putdev;
+ }
+ fcoe_ethdrv_put(netdev);
+ rc = 0;
+out_putdev:
+ dev_put(netdev);
+out_nodev:
+ return rc;
+}
+
+/**
+ * fcoe_create - handles the create call from sysfs
+ * @buffer: expcted to be a eth if name
+ * @kp: associated kernel param
+ *
+ * Returns: 0 for success
+ **/
+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);
+
+ /* pass to transport */
+ rc = fcoe_transport_attach(netdev);
+ if (rc) {
+ printk(KERN_ERR "fcoe: fcoe_transport_attach(%s) failed\n",
+ 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");
+
+/*
+ * fcoe_link_ok - check if link is ok for the fc_lport
+ * @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)
+{
+ struct fcoe_softc *fc = fcoe_softc(lp);
+ 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;
+}
+EXPORT_SYMBOL_GPL(fcoe_link_ok);
+
+/*
+ * fcoe_percpu_clean - frees skb of the corresponding lport from the per
+ * cpu queue.
+ * @lp: the fc_lport
+ */
+void fcoe_percpu_clean(struct fc_lport *lp)
+{
+ int idx;
+ struct fcoe_percpu_s *pp;
+ struct fcoe_rcv_info *fr;
+ struct sk_buff_head *list;
+ struct sk_buff *skb, *next;
+ struct sk_buff *head;
+
+ for (idx = 0; idx < NR_CPUS; idx++) {
+ if (fcoe_percpu[idx]) {
+ pp = fcoe_percpu[idx];
+ 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);
+ }
+ }
+ spin_unlock_bh(&pp->fcoe_rx_list.lock);
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(fcoe_percpu_clean);
+
+/**
+ * fcoe_clean_pending_queue - dequeue skb and free it
+ * @lp: the corresponding fc_lport
+ *
+ * Returns: none
+ **/
+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);
+}
+EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue);
+
+/**
+ * libfc_host_alloc - allocate a Scsi_Host with room for the fc_lport
+ * @sht: ptr to the scsi host templ
+ * @priv_size: size of private data after fc_lport
+ *
+ * Returns: ptr to Scsi_Host
+ * TODO - to libfc?
+ */
+static inline struct Scsi_Host *libfc_host_alloc(
+ struct scsi_host_template *sht, int priv_size)
+{
+ return scsi_host_alloc(sht, sizeof(struct fc_lport) + priv_size);
+}
+
+/**
+ * fcoe_host_alloc - allocate a Scsi_Host with room for the fcoe_softc
+ * @sht: ptr to the scsi host templ
+ * @priv_size: size of private data after fc_lport
+ *
+ * Returns: ptr to Scsi_Host
+ */
+struct Scsi_Host *fcoe_host_alloc(struct scsi_host_template *sht, int priv_size)
+{
+ return libfc_host_alloc(sht, sizeof(struct fcoe_softc) + priv_size);
+}
+EXPORT_SYMBOL_GPL(fcoe_host_alloc);
+
+/*
+ * fcoe_reset - resets the fcoe
+ * @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;
+}
+EXPORT_SYMBOL_GPL(fcoe_reset);
+
+/*
+ * fcoe_wwn_from_mac - converts 48-bit IEEE MAC address to 64-bit FC WWN.
+ * @mac: mac address
+ * @scheme: check port
+ * @port: port indicator for converting
+ *
+ * Returns: u64 fc world wide name
+ */
+u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
+ unsigned int scheme, unsigned int port)
+{
+ u64 wwn;
+ u64 host_mac;
+
+ /* The MAC is in NO, so flip only the low 48 bits */
+ host_mac = ((u64) mac[0] << 40) |
+ ((u64) mac[1] << 32) |
+ ((u64) mac[2] << 24) |
+ ((u64) mac[3] << 16) |
+ ((u64) mac[4] << 8) |
+ (u64) mac[5];
+
+ WARN_ON(host_mac >= (1ULL << 48));
+ wwn = host_mac | ((u64) scheme << 60);
+ switch (scheme) {
+ case 1:
+ WARN_ON(port != 0);
+ break;
+ case 2:
+ WARN_ON(port >= 0xfff);
+ wwn |= (u64) port << 48;
+ break;
+ default:
+ WARN_ON(1);
+ break;
+ }
+
+ return wwn;
+}
+EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
+/*
+ * fcoe_hostlist_lookup_softc - find the corresponding lport by a given device
+ * @device: this is currently ptr to net_device
+ *
+ * Returns: NULL or the located fcoe_softc
+ */
+static struct fcoe_softc *fcoe_hostlist_lookup_softc(
+ const struct net_device *dev)
+{
+ 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;
+}
+
+/*
+ * fcoe_hostlist_lookup - find the corresponding lport by netdev
+ * @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);
+
+ return (fc) ? fc->lp : NULL;
+}
+EXPORT_SYMBOL_GPL(fcoe_hostlist_lookup);
+
+/*
+ * fcoe_hostlist_add - add a lport to lports list
+ * @lp: ptr to the fc_lport to badded
+ *
+ * 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) {
+ fc = fcoe_softc(lp);
+ write_lock_bh(&fcoe_hostlist_lock);
+ list_add_tail(&fc->list, &fcoe_hostlist);
+ write_unlock_bh(&fcoe_hostlist_lock);
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fcoe_hostlist_add);
+
+/*
+ * fcoe_hostlist_remove - remove a lport from lports list
+ * @lp: ptr to the fc_lport to badded
+ *
+ * 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;
+}
+EXPORT_SYMBOL_GPL(fcoe_hostlist_remove);
+
+/**
+ * fcoe_libfc_config - sets up libfc related properties for lport
+ * @lp: ptr to the fc_lport
+ * @tt: libfc function template
+ *
+ * Returns : 0 for success
+ **/
+int fcoe_libfc_config(struct fc_lport *lp, struct libfc_function_template *tt)
+{
+ /* Set the function pointers set by the LLDD */
+ memcpy(&lp->tt, tt, sizeof(*tt));
+ if (fc_fcp_init(lp))
+ return -ENOMEM;
+ fc_exch_init(lp);
+ fc_elsct_init(lp);
+ fc_lport_init(lp);
+ fc_rport_init(lp);
+ fc_disc_init(lp);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fcoe_libfc_config);
+
+/**
+ * fcoe_init - fcoe module loading initialization
+ *
+ * Initialization routine
+ * 1. Will create fc transport software structure
+ * 2. initialize the link list of port information structure
+ *
+ * Returns 0 on success, negative on failure
+ **/
+static int __init fcoe_init(void)
+{
+ int cpu;
+ struct fcoe_percpu_s *p;
+
+
+ INIT_LIST_HEAD(&fcoe_hostlist);
+ rwlock_init(&fcoe_hostlist_lock);
+
+#ifdef CONFIG_HOTPLUG_CPU
+ register_cpu_notifier(&fcoe_cpu_notifier);
+#endif /* CONFIG_HOTPLUG_CPU */
+
+ /*
+ * initialize per CPU interrupt thread
+ */
+ for_each_online_cpu(cpu) {
+ p = kzalloc(sizeof(struct fcoe_percpu_s), GFP_KERNEL);
+ if (p) {
+ p->thread = kthread_create(fcoe_percpu_receive_thread,
+ (void *)p,
+ "fcoethread/%d", cpu);
+
+ /*
+ * if there is no error then bind the thread to the cpu
+ * initialize the semaphore and skb queue head
+ */
+ if (likely(!IS_ERR(p->thread))) {
+ p->cpu = cpu;
+ fcoe_percpu[cpu] = p;
+ skb_queue_head_init(&p->fcoe_rx_list);
+ kthread_bind(p->thread, cpu);
+ wake_up_process(p->thread);
+ } else {
+ fcoe_percpu[cpu] = NULL;
+ kfree(p);
+
+ }
+ }
+ }
+
+ /*
+ * setup link change notification
+ */
+ fcoe_dev_setup();
+
+ init_timer(&fcoe_timer);
+ fcoe_timer.data = 0;
+ fcoe_timer.function = fcoe_watchdog;
+ fcoe_timer.expires = (jiffies + (10 * HZ));
+ add_timer(&fcoe_timer);
+
+ /* initiatlize the fcoe transport */
+ fcoe_transport_init();
+
+ fcoe_sw_init();
+
+ return 0;
+}
+module_init(fcoe_init);
+
+/**
+ * fcoe_exit - fcoe module unloading cleanup
+ *
+ * Returns 0 on success, negative on failure
+ **/
+static void __exit fcoe_exit(void)
+{
+ u32 idx;
+ struct fcoe_softc *fc, *tmp;
+ struct fcoe_percpu_s *p;
+ struct sk_buff *skb;
+
+ /*
+ * Stop all call back interfaces
+ */
+#ifdef CONFIG_HOTPLUG_CPU
+ unregister_cpu_notifier(&fcoe_cpu_notifier);
+#endif /* CONFIG_HOTPLUG_CPU */
+ fcoe_dev_cleanup();
+
+ /*
+ * stop timer
+ */
+ del_timer_sync(&fcoe_timer);
+
+ /* releases the assocaited fcoe transport for each lport */
+ list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list)
+ fcoe_transport_release(fc->real_dev);
+
+ for (idx = 0; idx < NR_CPUS; idx++) {
+ if (fcoe_percpu[idx]) {
+ kthread_stop(fcoe_percpu[idx]->thread);
+ p = fcoe_percpu[idx];
+ 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);
+ if (fcoe_percpu[idx]->crc_eof_page)
+ put_page(fcoe_percpu[idx]->crc_eof_page);
+ kfree(fcoe_percpu[idx]);
+ }
+ }
+
+ /* remove sw trasnport */
+ fcoe_sw_exit();
+
+ /* detach the transport */
+ fcoe_transport_exit();
+}
+module_exit(fcoe_exit);