2 * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
17 * Maintained at www.Open-FCoE.org
20 #include <linux/module.h>
21 #include <linux/version.h>
22 #include <linux/spinlock.h>
23 #include <linux/netdevice.h>
24 #include <linux/etherdevice.h>
25 #include <linux/ethtool.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/crc32.h>
29 #include <linux/cpu.h>
31 #include <linux/sysfs.h>
32 #include <linux/ctype.h>
33 #include <scsi/scsi_tcq.h>
34 #include <scsi/scsicam.h>
35 #include <scsi/scsi_transport.h>
36 #include <scsi/scsi_transport_fc.h>
37 #include <net/rtnetlink.h>
39 #include <scsi/fc/fc_encaps.h>
40 #include <scsi/fc/fc_fip.h>
42 #include <scsi/libfc.h>
43 #include <scsi/fc_frame.h>
44 #include <scsi/libfcoe.h>
48 MODULE_AUTHOR("Open-FCoE.org");
49 MODULE_DESCRIPTION("FCoE");
50 MODULE_LICENSE("GPL v2");
53 LIST_HEAD(fcoe_hostlist);
54 DEFINE_RWLOCK(fcoe_hostlist_lock);
55 DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
57 /* Function Prototypes */
58 static int fcoe_reset(struct Scsi_Host *shost);
59 static int fcoe_xmit(struct fc_lport *, struct fc_frame *);
60 static int fcoe_rcv(struct sk_buff *, struct net_device *,
61 struct packet_type *, struct net_device *);
62 static int fcoe_percpu_receive_thread(void *arg);
63 static void fcoe_clean_pending_queue(struct fc_lport *lp);
64 static void fcoe_percpu_clean(struct fc_lport *lp);
65 static int fcoe_link_ok(struct fc_lport *lp);
67 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *);
68 static int fcoe_hostlist_add(const struct fc_lport *);
69 static int fcoe_hostlist_remove(const struct fc_lport *);
71 static void fcoe_check_wait_queue(struct fc_lport *, struct sk_buff *);
72 static int fcoe_device_notification(struct notifier_block *, ulong, void *);
73 static void fcoe_dev_setup(void);
74 static void fcoe_dev_cleanup(void);
76 /* notification function from net device */
77 static struct notifier_block fcoe_notifier = {
78 .notifier_call = fcoe_device_notification,
81 static struct scsi_transport_template *scsi_transport_fcoe_sw;
83 struct fc_function_template fcoe_transport_function = {
84 .show_host_node_name = 1,
85 .show_host_port_name = 1,
86 .show_host_supported_classes = 1,
87 .show_host_supported_fc4s = 1,
88 .show_host_active_fc4s = 1,
89 .show_host_maxframe_size = 1,
91 .show_host_port_id = 1,
92 .show_host_supported_speeds = 1,
93 .get_host_speed = fc_get_host_speed,
95 .show_host_port_type = 1,
96 .get_host_port_state = fc_get_host_port_state,
97 .show_host_port_state = 1,
98 .show_host_symbolic_name = 1,
100 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
101 .show_rport_maxframe_size = 1,
102 .show_rport_supported_classes = 1,
104 .show_host_fabric_name = 1,
105 .show_starget_node_name = 1,
106 .show_starget_port_name = 1,
107 .show_starget_port_id = 1,
108 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
109 .show_rport_dev_loss_tmo = 1,
110 .get_fc_host_stats = fc_get_host_stats,
111 .issue_fc_host_lip = fcoe_reset,
113 .terminate_rport_io = fc_rport_terminate_io,
116 static struct scsi_host_template fcoe_shost_template = {
117 .module = THIS_MODULE,
118 .name = "FCoE Driver",
119 .proc_name = FCOE_NAME,
120 .queuecommand = fc_queuecommand,
121 .eh_abort_handler = fc_eh_abort,
122 .eh_device_reset_handler = fc_eh_device_reset,
123 .eh_host_reset_handler = fc_eh_host_reset,
124 .slave_alloc = fc_slave_alloc,
125 .change_queue_depth = fc_change_queue_depth,
126 .change_queue_type = fc_change_queue_type,
129 .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
130 .use_clustering = ENABLE_CLUSTERING,
131 .sg_tablesize = SG_ALL,
132 .max_sectors = 0xffff,
136 * fcoe_fip_recv - handle a received FIP frame.
137 * @skb: the receive skb
138 * @dev: associated &net_device
139 * @ptype: the &packet_type structure which was used to register this handler.
140 * @orig_dev: original receive &net_device, in case @dev is a bond.
142 * Returns: 0 for success
144 static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *dev,
145 struct packet_type *ptype,
146 struct net_device *orig_dev)
148 struct fcoe_softc *fc;
150 fc = container_of(ptype, struct fcoe_softc, fip_packet_type);
151 fcoe_ctlr_recv(&fc->ctlr, skb);
156 * fcoe_fip_send() - send an Ethernet-encapsulated FIP frame.
157 * @fip: FCoE controller.
160 static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
162 skb->dev = fcoe_from_ctlr(fip)->real_dev;
167 * fcoe_update_src_mac() - Update Ethernet MAC filters.
168 * @fip: FCoE controller.
169 * @old: Unicast MAC address to delete if the MAC is non-zero.
170 * @new: Unicast MAC address to add.
172 * Remove any previously-set unicast MAC filter.
173 * Add secondary FCoE MAC address filter for our OUI.
175 static void fcoe_update_src_mac(struct fcoe_ctlr *fip, u8 *old, u8 *new)
177 struct fcoe_softc *fc;
179 fc = fcoe_from_ctlr(fip);
181 if (!is_zero_ether_addr(old))
182 dev_unicast_delete(fc->real_dev, old);
183 dev_unicast_add(fc->real_dev, new);
188 * fcoe_lport_config() - sets up the fc_lport
189 * @lp: ptr to the fc_lport
191 * Returns: 0 for success
193 static int fcoe_lport_config(struct fc_lport *lp)
197 lp->max_retry_count = 3;
198 lp->max_rport_retry_count = 3;
199 lp->e_d_tov = 2 * 1000; /* FC-FS default */
200 lp->r_a_tov = 2 * 2 * 1000;
201 lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
202 FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
204 fc_lport_init_stats(lp);
206 /* lport fc_lport related configuration */
209 /* offload related configuration */
220 * fcoe_netdev_cleanup() - clean up netdev configurations
221 * @fc: ptr to the fcoe_softc
223 void fcoe_netdev_cleanup(struct fcoe_softc *fc)
225 u8 flogi_maddr[ETH_ALEN];
227 /* Don't listen for Ethernet packets anymore */
228 dev_remove_pack(&fc->fcoe_packet_type);
229 dev_remove_pack(&fc->fip_packet_type);
231 /* Delete secondary MAC addresses */
233 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
234 dev_unicast_delete(fc->real_dev, flogi_maddr);
235 if (!is_zero_ether_addr(fc->ctlr.data_src_addr))
236 dev_unicast_delete(fc->real_dev, fc->ctlr.data_src_addr);
238 dev_unicast_delete(fc->real_dev, fc->ctlr.ctl_src_addr);
239 dev_mc_delete(fc->real_dev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0);
244 * fcoe_queue_timer() - fcoe queue timer
245 * @lp: the fc_lport pointer
247 * Calls fcoe_check_wait_queue on timeout
250 static void fcoe_queue_timer(ulong lp)
252 fcoe_check_wait_queue((struct fc_lport *)lp, NULL);
256 * fcoe_netdev_config() - Set up netdev for SW FCoE
257 * @lp : ptr to the fc_lport
258 * @netdev : ptr to the associated netdevice struct
260 * Must be called after fcoe_lport_config() as it will use lport mutex
262 * Returns : 0 for success
264 static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev)
268 struct fcoe_softc *fc;
269 u8 flogi_maddr[ETH_ALEN];
270 struct netdev_hw_addr *ha;
272 /* Setup lport private data to point to fcoe softc */
275 fc->real_dev = netdev;
276 fc->phys_dev = netdev;
278 /* Require support for get_pauseparam ethtool op. */
279 if (netdev->priv_flags & IFF_802_1Q_VLAN)
280 fc->phys_dev = vlan_dev_real_dev(netdev);
282 /* Do not support for bonding device */
283 if ((fc->real_dev->priv_flags & IFF_MASTER_ALB) ||
284 (fc->real_dev->priv_flags & IFF_SLAVE_INACTIVE) ||
285 (fc->real_dev->priv_flags & IFF_MASTER_8023AD)) {
290 * Determine max frame size based on underlying device and optional
291 * user-configured limit. If the MFS is too low, fcoe_link_ok()
292 * will return 0, so do this first.
294 mfs = fc->real_dev->mtu - (sizeof(struct fcoe_hdr) +
295 sizeof(struct fcoe_crc_eof));
296 if (fc_set_mfs(lp, mfs))
299 /* offload features support */
300 if (fc->real_dev->features & NETIF_F_SG)
303 #ifdef NETIF_F_FCOE_CRC
304 if (netdev->features & NETIF_F_FCOE_CRC) {
306 FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
310 if (netdev->features & NETIF_F_FSO) {
312 lp->lso_max = netdev->gso_max_size;
313 FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
317 if (netdev->fcoe_ddp_xid) {
319 lp->lro_xid = netdev->fcoe_ddp_xid;
320 FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
323 skb_queue_head_init(&fc->fcoe_pending_queue);
324 fc->fcoe_pending_queue_active = 0;
325 setup_timer(&fc->timer, fcoe_queue_timer, (unsigned long)lp);
327 /* look for SAN MAC address, if multiple SAN MACs exist, only
328 * use the first one for SPMA */
330 for_each_dev_addr(netdev, ha) {
331 if ((ha->type == NETDEV_HW_ADDR_T_SAN) &&
332 (is_valid_ether_addr(ha->addr))) {
333 memcpy(fc->ctlr.ctl_src_addr, ha->addr, ETH_ALEN);
340 /* setup Source Mac Address */
342 memcpy(fc->ctlr.ctl_src_addr, fc->real_dev->dev_addr,
343 fc->real_dev->addr_len);
345 wwnn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 1, 0);
346 fc_set_wwnn(lp, wwnn);
347 /* XXX - 3rd arg needs to be vlan id */
348 wwpn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 2, 0);
349 fc_set_wwpn(lp, wwpn);
352 * Add FCoE MAC address as second unicast MAC address
353 * or enter promiscuous mode if not capable of listening
354 * for multiple unicast MACs.
357 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
358 dev_unicast_add(fc->real_dev, flogi_maddr);
360 dev_unicast_add(fc->real_dev, fc->ctlr.ctl_src_addr);
361 dev_mc_add(fc->real_dev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0);
365 * setup the receive function from ethernet driver
366 * on the ethertype for the given device
368 fc->fcoe_packet_type.func = fcoe_rcv;
369 fc->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
370 fc->fcoe_packet_type.dev = fc->real_dev;
371 dev_add_pack(&fc->fcoe_packet_type);
373 fc->fip_packet_type.func = fcoe_fip_recv;
374 fc->fip_packet_type.type = htons(ETH_P_FIP);
375 fc->fip_packet_type.dev = fc->real_dev;
376 dev_add_pack(&fc->fip_packet_type);
382 * fcoe_shost_config() - Sets up fc_lport->host
383 * @lp : ptr to the fc_lport
384 * @shost : ptr to the associated scsi host
385 * @dev : device associated to scsi host
387 * Must be called after fcoe_lport_config() and fcoe_netdev_config()
389 * Returns : 0 for success
391 static int fcoe_shost_config(struct fc_lport *lp, struct Scsi_Host *shost,
396 /* lport scsi host config */
399 lp->host->max_lun = FCOE_MAX_LUN;
400 lp->host->max_id = FCOE_MAX_FCP_TARGET;
401 lp->host->max_channel = 0;
402 lp->host->transportt = scsi_transport_fcoe_sw;
404 /* add the new host to the SCSI-ml */
405 rc = scsi_add_host(lp->host, dev);
407 FCOE_NETDEV_DBG(fcoe_netdev(lp), "fcoe_shost_config: "
408 "error on scsi_add_host\n");
411 sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s",
412 FCOE_NAME, FCOE_VERSION,
413 fcoe_netdev(lp)->name);
419 * fcoe_em_config() - allocates em for this lport
420 * @lp: the port that em is to allocated for
422 * Called with write fcoe_hostlist_lock held.
424 * Returns : 0 on success
426 static inline int fcoe_em_config(struct fc_lport *lp)
428 if (!fc_exch_mgr_alloc(lp, FC_CLASS_3, FCOE_MIN_XID,
436 * fcoe_if_destroy() - FCoE software HBA tear-down function
437 * @netdev: ptr to the associated net_device
439 * Returns: 0 if link is OK for use by FCoE.
441 static int fcoe_if_destroy(struct net_device *netdev)
443 struct fc_lport *lp = NULL;
444 struct fcoe_softc *fc;
448 FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
450 lp = fcoe_hostlist_lookup(netdev);
456 /* Logout of the fabric */
457 fc_fabric_logoff(lp);
459 /* Remove the instance from fcoe's list */
460 fcoe_hostlist_remove(lp);
462 /* clean up netdev configurations */
463 fcoe_netdev_cleanup(fc);
465 /* tear-down the FCoE controller */
466 fcoe_ctlr_destroy(&fc->ctlr);
468 /* Free queued packets for the per-CPU receive threads */
469 fcoe_percpu_clean(lp);
471 /* Cleanup the fc_lport */
472 fc_lport_destroy(lp);
475 /* Detach from the scsi-ml */
476 fc_remove_host(lp->host);
477 scsi_remove_host(lp->host);
479 /* There are no more rports or I/O, free the EM */
480 fc_exch_mgr_free(lp);
482 /* Free existing skbs */
483 fcoe_clean_pending_queue(lp);
486 del_timer_sync(&fc->timer);
488 /* Free memory used by statistical counters */
489 fc_lport_free_stats(lp);
491 /* Release the net_device and Scsi_Host */
492 dev_put(fc->real_dev);
493 scsi_host_put(lp->host);
499 * fcoe_ddp_setup - calls LLD's ddp_setup through net_device
500 * @lp: the corresponding fc_lport
501 * @xid: the exchange id for this ddp transfer
502 * @sgl: the scatterlist describing this transfer
503 * @sgc: number of sg items
507 static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid,
508 struct scatterlist *sgl, unsigned int sgc)
510 struct net_device *n = fcoe_netdev(lp);
512 if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_setup)
513 return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc);
519 * fcoe_ddp_done - calls LLD's ddp_done through net_device
520 * @lp: the corresponding fc_lport
521 * @xid: the exchange id for this ddp transfer
523 * Returns : the length of data that have been completed by ddp
525 static int fcoe_ddp_done(struct fc_lport *lp, u16 xid)
527 struct net_device *n = fcoe_netdev(lp);
529 if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_done)
530 return n->netdev_ops->ndo_fcoe_ddp_done(n, xid);
534 static struct libfc_function_template fcoe_libfc_fcn_templ = {
535 .frame_send = fcoe_xmit,
536 .ddp_setup = fcoe_ddp_setup,
537 .ddp_done = fcoe_ddp_done,
541 * fcoe_if_create() - this function creates the fcoe interface
542 * @netdev: pointer the associated netdevice
544 * Creates fc_lport struct and scsi_host for lport, configures lport
545 * and starts fabric login.
547 * Returns : 0 on success
549 static int fcoe_if_create(struct net_device *netdev)
552 struct fc_lport *lp = NULL;
553 struct fcoe_softc *fc;
554 struct Scsi_Host *shost;
558 FCOE_NETDEV_DBG(netdev, "Create Interface\n");
560 lp = fcoe_hostlist_lookup(netdev);
564 shost = libfc_host_alloc(&fcoe_shost_template,
565 sizeof(struct fcoe_softc));
567 FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n");
570 lp = shost_priv(shost);
573 /* configure fc_lport, e.g., em */
574 rc = fcoe_lport_config(lp);
576 FCOE_NETDEV_DBG(netdev, "Could not configure lport for the "
584 fcoe_ctlr_init(&fc->ctlr);
585 fc->ctlr.send = fcoe_fip_send;
586 fc->ctlr.update_mac = fcoe_update_src_mac;
588 /* configure lport network properties */
589 rc = fcoe_netdev_config(lp, netdev);
591 FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the "
593 goto out_netdev_cleanup;
596 /* configure lport scsi host properties */
597 rc = fcoe_shost_config(lp, shost, &netdev->dev);
599 FCOE_NETDEV_DBG(netdev, "Could not configure shost for the "
601 goto out_netdev_cleanup;
604 /* Initialize the library */
605 rc = fcoe_libfc_config(lp, &fcoe_libfc_fcn_templ);
607 FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the "
613 * fcoe_em_alloc() and fcoe_hostlist_add() both
614 * need to be atomic under fcoe_hostlist_lock
615 * since fcoe_em_alloc() looks for an existing EM
616 * instance on host list updated by fcoe_hostlist_add().
618 write_lock(&fcoe_hostlist_lock);
619 /* lport exch manager allocation */
620 rc = fcoe_em_config(lp);
622 FCOE_NETDEV_DBG(netdev, "Could not configure the EM for the "
627 /* add to lports list */
628 fcoe_hostlist_add(lp);
629 write_unlock(&fcoe_hostlist_lock);
631 lp->boot_time = jiffies;
635 if (!fcoe_link_ok(lp))
636 fcoe_ctlr_link_up(&fc->ctlr);
643 fc_exch_mgr_free(lp);
645 fcoe_netdev_cleanup(fc);
647 scsi_host_put(lp->host);
652 * fcoe_if_init() - attach to scsi transport
654 * Returns : 0 on success
656 static int __init fcoe_if_init(void)
658 /* attach to scsi transport */
659 scsi_transport_fcoe_sw =
660 fc_attach_transport(&fcoe_transport_function);
662 if (!scsi_transport_fcoe_sw) {
663 printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n");
671 * fcoe_if_exit() - detach from scsi transport
673 * Returns : 0 on success
675 int __exit fcoe_if_exit(void)
677 fc_release_transport(scsi_transport_fcoe_sw);
682 * fcoe_percpu_thread_create() - Create a receive thread for an online cpu
683 * @cpu: cpu index for the online cpu
685 static void fcoe_percpu_thread_create(unsigned int cpu)
687 struct fcoe_percpu_s *p;
688 struct task_struct *thread;
690 p = &per_cpu(fcoe_percpu, cpu);
692 thread = kthread_create(fcoe_percpu_receive_thread,
693 (void *)p, "fcoethread/%d", cpu);
695 if (likely(!IS_ERR(p->thread))) {
696 kthread_bind(thread, cpu);
697 wake_up_process(thread);
699 spin_lock_bh(&p->fcoe_rx_list.lock);
701 spin_unlock_bh(&p->fcoe_rx_list.lock);
706 * fcoe_percpu_thread_destroy() - removes the rx thread for the given cpu
707 * @cpu: cpu index the rx thread is to be removed
709 * Destroys a per-CPU Rx thread. Any pending skbs are moved to the
710 * current CPU's Rx thread. If the thread being destroyed is bound to
711 * the CPU processing this context the skbs will be freed.
713 static void fcoe_percpu_thread_destroy(unsigned int cpu)
715 struct fcoe_percpu_s *p;
716 struct task_struct *thread;
717 struct page *crc_eof;
720 struct fcoe_percpu_s *p0;
721 unsigned targ_cpu = smp_processor_id();
722 #endif /* CONFIG_SMP */
724 FCOE_DBG("Destroying receive thread for CPU %d\n", cpu);
726 /* Prevent any new skbs from being queued for this CPU. */
727 p = &per_cpu(fcoe_percpu, cpu);
728 spin_lock_bh(&p->fcoe_rx_list.lock);
731 crc_eof = p->crc_eof_page;
732 p->crc_eof_page = NULL;
733 p->crc_eof_offset = 0;
734 spin_unlock_bh(&p->fcoe_rx_list.lock);
738 * Don't bother moving the skb's if this context is running
739 * on the same CPU that is having its thread destroyed. This
740 * can easily happen when the module is removed.
742 if (cpu != targ_cpu) {
743 p0 = &per_cpu(fcoe_percpu, targ_cpu);
744 spin_lock_bh(&p0->fcoe_rx_list.lock);
746 FCOE_DBG("Moving frames from CPU %d to CPU %d\n",
749 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
750 __skb_queue_tail(&p0->fcoe_rx_list, skb);
751 spin_unlock_bh(&p0->fcoe_rx_list.lock);
754 * The targeted CPU is not initialized and cannot accept
755 * new skbs. Unlock the targeted CPU and drop the skbs
756 * on the CPU that is going offline.
758 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
760 spin_unlock_bh(&p0->fcoe_rx_list.lock);
764 * This scenario occurs when the module is being removed
765 * and all threads are being destroyed. skbs will continue
766 * to be shifted from the CPU thread that is being removed
767 * to the CPU thread associated with the CPU that is processing
768 * the module removal. Once there is only one CPU Rx thread it
769 * will reach this case and we will drop all skbs and later
772 spin_lock_bh(&p->fcoe_rx_list.lock);
773 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
775 spin_unlock_bh(&p->fcoe_rx_list.lock);
779 * This a non-SMP scenario where the singular Rx thread is
780 * being removed. Free all skbs and stop the thread.
782 spin_lock_bh(&p->fcoe_rx_list.lock);
783 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
785 spin_unlock_bh(&p->fcoe_rx_list.lock);
789 kthread_stop(thread);
796 * fcoe_cpu_callback() - fcoe cpu hotplug event callback
797 * @nfb: callback data block
798 * @action: event triggering the callback
799 * @hcpu: index for the cpu of this event
801 * This creates or destroys per cpu data for fcoe
803 * Returns NOTIFY_OK always.
805 static int fcoe_cpu_callback(struct notifier_block *nfb,
806 unsigned long action, void *hcpu)
808 unsigned cpu = (unsigned long)hcpu;
812 case CPU_ONLINE_FROZEN:
813 FCOE_DBG("CPU %x online: Create Rx thread\n", cpu);
814 fcoe_percpu_thread_create(cpu);
817 case CPU_DEAD_FROZEN:
818 FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu);
819 fcoe_percpu_thread_destroy(cpu);
827 static struct notifier_block fcoe_cpu_notifier = {
828 .notifier_call = fcoe_cpu_callback,
832 * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ
833 * @skb: the receive skb
834 * @dev: associated net device
836 * @olddev: last device
838 * this function will receive the packet and build fc frame and pass it up
840 * Returns: 0 for success
842 int fcoe_rcv(struct sk_buff *skb, struct net_device *dev,
843 struct packet_type *ptype, struct net_device *olddev)
846 struct fcoe_rcv_info *fr;
847 struct fcoe_softc *fc;
848 struct fc_frame_header *fh;
849 struct fcoe_percpu_s *fps;
851 unsigned int cpu = 0;
853 fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type);
855 if (unlikely(lp == NULL)) {
856 FCOE_NETDEV_DBG(dev, "Cannot find hba structure");
862 FCOE_NETDEV_DBG(dev, "skb_info: len:%d data_len:%d head:%p "
863 "data:%p tail:%p end:%p sum:%d dev:%s",
864 skb->len, skb->data_len, skb->head, skb->data,
865 skb_tail_pointer(skb), skb_end_pointer(skb),
866 skb->csum, skb->dev ? skb->dev->name : "<NULL>");
868 /* check for FCOE packet type */
869 if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) {
870 FCOE_NETDEV_DBG(dev, "Wrong FC type frame");
875 * Check for minimum frame length, and make sure required FCoE
876 * and FC headers are pulled into the linear data area.
878 if (unlikely((skb->len < FCOE_MIN_FRAME) ||
879 !pskb_may_pull(skb, FCOE_HEADER_LEN)))
882 skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
883 fh = (struct fc_frame_header *) skb_transport_header(skb);
885 oxid = ntohs(fh->fh_ox_id);
887 fr = fcoe_dev_from_skb(skb);
893 * The incoming frame exchange id(oxid) is ANDed with num of online
894 * cpu bits to get cpu and then this cpu is used for selecting
895 * a per cpu kernel thread from fcoe_percpu.
897 cpu = oxid & (num_online_cpus() - 1);
900 fps = &per_cpu(fcoe_percpu, cpu);
901 spin_lock_bh(&fps->fcoe_rx_list.lock);
902 if (unlikely(!fps->thread)) {
904 * The targeted CPU is not ready, let's target
905 * the first CPU now. For non-SMP systems this
906 * will check the same CPU twice.
908 FCOE_NETDEV_DBG(dev, "CPU is online, but no receive thread "
909 "ready for incoming skb- using first online "
912 spin_unlock_bh(&fps->fcoe_rx_list.lock);
913 cpu = first_cpu(cpu_online_map);
914 fps = &per_cpu(fcoe_percpu, cpu);
915 spin_lock_bh(&fps->fcoe_rx_list.lock);
917 spin_unlock_bh(&fps->fcoe_rx_list.lock);
923 * We now have a valid CPU that we're targeting for
924 * this skb. We also have this receive thread locked,
925 * so we're free to queue skbs into it's queue.
927 __skb_queue_tail(&fps->fcoe_rx_list, skb);
928 if (fps->fcoe_rx_list.qlen == 1)
929 wake_up_process(fps->thread);
931 spin_unlock_bh(&fps->fcoe_rx_list.lock);
935 fc_lport_get_stats(lp)->ErrorFrames++;
943 * fcoe_start_io() - pass to netdev to start xmit for fcoe
944 * @skb: the skb to be xmitted
946 * Returns: 0 for success
948 static inline int fcoe_start_io(struct sk_buff *skb)
953 rc = dev_queue_xmit(skb);
961 * fcoe_get_paged_crc_eof() - in case we need to alloc a page for crc_eof
962 * @skb: the skb to be xmitted
965 * Returns: 0 for success
967 static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
969 struct fcoe_percpu_s *fps;
972 fps = &get_cpu_var(fcoe_percpu);
973 page = fps->crc_eof_page;
975 page = alloc_page(GFP_ATOMIC);
977 put_cpu_var(fcoe_percpu);
980 fps->crc_eof_page = page;
981 fps->crc_eof_offset = 0;
985 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
986 fps->crc_eof_offset, tlen);
988 skb->data_len += tlen;
989 skb->truesize += tlen;
990 fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);
992 if (fps->crc_eof_offset >= PAGE_SIZE) {
993 fps->crc_eof_page = NULL;
994 fps->crc_eof_offset = 0;
997 put_cpu_var(fcoe_percpu);
1002 * fcoe_fc_crc() - calculates FC CRC in this fcoe skb
1003 * @fp: the fc_frame containing data to be checksummed
1005 * This uses crc32() to calculate the crc for fc frame
1006 * Return : 32 bit crc
1008 u32 fcoe_fc_crc(struct fc_frame *fp)
1010 struct sk_buff *skb = fp_skb(fp);
1011 struct skb_frag_struct *frag;
1012 unsigned char *data;
1013 unsigned long off, len, clen;
1017 crc = crc32(~0, skb->data, skb_headlen(skb));
1019 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1020 frag = &skb_shinfo(skb)->frags[i];
1021 off = frag->page_offset;
1024 clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
1025 data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
1026 KM_SKB_DATA_SOFTIRQ);
1027 crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
1028 kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
1037 * fcoe_xmit() - FCoE frame transmit function
1038 * @lp: the associated local port
1039 * @fp: the fc_frame to be transmitted
1041 * Return : 0 for success
1043 int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp)
1048 struct fcoe_crc_eof *cp;
1049 struct sk_buff *skb;
1050 struct fcoe_dev_stats *stats;
1051 struct fc_frame_header *fh;
1052 unsigned int hlen; /* header length implies the version */
1053 unsigned int tlen; /* trailer length */
1054 unsigned int elen; /* eth header, may include vlan */
1055 struct fcoe_softc *fc;
1057 struct fcoe_hdr *hp;
1059 WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
1061 fc = lport_priv(lp);
1062 fh = fc_frame_header_get(fp);
1064 wlen = skb->len / FCOE_WORD_TO_BYTE;
1071 if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) &&
1072 fcoe_ctlr_els_send(&fc->ctlr, skb))
1078 elen = sizeof(struct ethhdr);
1079 hlen = sizeof(struct fcoe_hdr);
1080 tlen = sizeof(struct fcoe_crc_eof);
1081 wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
1084 if (likely(lp->crc_offload)) {
1085 skb->ip_summed = CHECKSUM_PARTIAL;
1086 skb->csum_start = skb_headroom(skb);
1087 skb->csum_offset = skb->len;
1090 skb->ip_summed = CHECKSUM_NONE;
1091 crc = fcoe_fc_crc(fp);
1094 /* copy fc crc and eof to the skb buff */
1095 if (skb_is_nonlinear(skb)) {
1097 if (fcoe_get_paged_crc_eof(skb, tlen)) {
1101 frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
1102 cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
1103 + frag->page_offset;
1105 cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
1108 memset(cp, 0, sizeof(*cp));
1110 cp->fcoe_crc32 = cpu_to_le32(~crc);
1112 if (skb_is_nonlinear(skb)) {
1113 kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ);
1117 /* adjust skb network/transport offsets to match mac/fcoe/fc */
1118 skb_push(skb, elen + hlen);
1119 skb_reset_mac_header(skb);
1120 skb_reset_network_header(skb);
1121 skb->mac_len = elen;
1122 skb->protocol = htons(ETH_P_FCOE);
1123 skb->dev = fc->real_dev;
1125 /* fill up mac and fcoe headers */
1127 eh->h_proto = htons(ETH_P_FCOE);
1128 if (fc->ctlr.map_dest)
1129 fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id);
1131 /* insert GW address */
1132 memcpy(eh->h_dest, fc->ctlr.dest_addr, ETH_ALEN);
1134 if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN))
1135 memcpy(eh->h_source, fc->ctlr.ctl_src_addr, ETH_ALEN);
1137 memcpy(eh->h_source, fc->ctlr.data_src_addr, ETH_ALEN);
1139 hp = (struct fcoe_hdr *)(eh + 1);
1140 memset(hp, 0, sizeof(*hp));
1142 FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
1146 /* fcoe lso, mss is in max_payload which is non-zero for FCP data */
1147 if (lp->seq_offload && fr_max_payload(fp)) {
1148 skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
1149 skb_shinfo(skb)->gso_size = fr_max_payload(fp);
1151 skb_shinfo(skb)->gso_type = 0;
1152 skb_shinfo(skb)->gso_size = 0;
1155 /* update tx stats: regardless if LLD fails */
1156 stats = fc_lport_get_stats(lp);
1158 stats->TxWords += wlen;
1160 /* send down to lld */
1162 if (fc->fcoe_pending_queue.qlen)
1163 fcoe_check_wait_queue(lp, skb);
1164 else if (fcoe_start_io(skb))
1165 fcoe_check_wait_queue(lp, skb);
1171 * fcoe_percpu_receive_thread() - recv thread per cpu
1172 * @arg: ptr to the fcoe per cpu struct
1174 * Return: 0 for success
1176 int fcoe_percpu_receive_thread(void *arg)
1178 struct fcoe_percpu_s *p = arg;
1180 struct fc_lport *lp;
1181 struct fcoe_rcv_info *fr;
1182 struct fcoe_dev_stats *stats;
1183 struct fc_frame_header *fh;
1184 struct sk_buff *skb;
1185 struct fcoe_crc_eof crc_eof;
1186 struct fc_frame *fp;
1188 struct fcoe_softc *fc;
1189 struct fcoe_hdr *hp;
1191 set_user_nice(current, -20);
1193 while (!kthread_should_stop()) {
1195 spin_lock_bh(&p->fcoe_rx_list.lock);
1196 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) {
1197 set_current_state(TASK_INTERRUPTIBLE);
1198 spin_unlock_bh(&p->fcoe_rx_list.lock);
1200 set_current_state(TASK_RUNNING);
1201 if (kthread_should_stop())
1203 spin_lock_bh(&p->fcoe_rx_list.lock);
1205 spin_unlock_bh(&p->fcoe_rx_list.lock);
1206 fr = fcoe_dev_from_skb(skb);
1208 if (unlikely(lp == NULL)) {
1209 FCOE_NETDEV_DBG(skb->dev, "Invalid HBA Structure");
1214 FCOE_NETDEV_DBG(skb->dev, "skb_info: len:%d data_len:%d "
1215 "head:%p data:%p tail:%p end:%p sum:%d dev:%s",
1216 skb->len, skb->data_len,
1217 skb->head, skb->data, skb_tail_pointer(skb),
1218 skb_end_pointer(skb), skb->csum,
1219 skb->dev ? skb->dev->name : "<NULL>");
1222 * Save source MAC address before discarding header.
1224 fc = lport_priv(lp);
1225 if (skb_is_nonlinear(skb))
1226 skb_linearize(skb); /* not ideal */
1227 mac = eth_hdr(skb)->h_source;
1230 * Frame length checks and setting up the header pointers
1231 * was done in fcoe_rcv already.
1233 hp = (struct fcoe_hdr *) skb_network_header(skb);
1234 fh = (struct fc_frame_header *) skb_transport_header(skb);
1236 stats = fc_lport_get_stats(lp);
1237 if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
1238 if (stats->ErrorFrames < 5)
1239 printk(KERN_WARNING "fcoe: FCoE version "
1240 "mismatch: The frame has "
1241 "version %x, but the "
1242 "initiator supports version "
1243 "%x\n", FC_FCOE_DECAPS_VER(hp),
1245 stats->ErrorFrames++;
1250 skb_pull(skb, sizeof(struct fcoe_hdr));
1251 fr_len = skb->len - sizeof(struct fcoe_crc_eof);
1254 stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
1256 fp = (struct fc_frame *)skb;
1259 fr_sof(fp) = hp->fcoe_sof;
1261 /* Copy out the CRC and EOF trailer for access */
1262 if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) {
1266 fr_eof(fp) = crc_eof.fcoe_eof;
1267 fr_crc(fp) = crc_eof.fcoe_crc32;
1268 if (pskb_trim(skb, fr_len)) {
1274 * We only check CRC if no offload is available and if it is
1275 * it's solicited data, in which case, the FCP layer would
1276 * check it during the copy.
1278 if (lp->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY)
1279 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1281 fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
1283 fh = fc_frame_header_get(fp);
1284 if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA &&
1285 fh->fh_type == FC_TYPE_FCP) {
1286 fc_exch_recv(lp, fp);
1289 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
1290 if (le32_to_cpu(fr_crc(fp)) !=
1291 ~crc32(~0, skb->data, fr_len)) {
1292 if (stats->InvalidCRCCount < 5)
1293 printk(KERN_WARNING "fcoe: dropping "
1294 "frame with CRC error\n");
1295 stats->InvalidCRCCount++;
1296 stats->ErrorFrames++;
1300 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1302 if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN) &&
1303 fcoe_ctlr_recv_flogi(&fc->ctlr, fp, mac)) {
1307 fc_exch_recv(lp, fp);
1313 * fcoe_check_wait_queue() - attempt to clear the transmit backlog
1316 * This empties the wait_queue, dequeue the head of the wait_queue queue
1317 * and calls fcoe_start_io() for each packet, if all skb have been
1318 * transmitted, return qlen or -1 if a error occurs, then restore
1319 * wait_queue and try again later.
1321 * The wait_queue is used when the skb transmit fails. skb will go
1322 * in the wait_queue which will be emptied by the timer function or
1323 * by the next skb transmit.
1325 static void fcoe_check_wait_queue(struct fc_lport *lp, struct sk_buff *skb)
1327 struct fcoe_softc *fc = lport_priv(lp);
1330 spin_lock_bh(&fc->fcoe_pending_queue.lock);
1333 __skb_queue_tail(&fc->fcoe_pending_queue, skb);
1335 if (fc->fcoe_pending_queue_active)
1337 fc->fcoe_pending_queue_active = 1;
1339 while (fc->fcoe_pending_queue.qlen) {
1340 /* keep qlen > 0 until fcoe_start_io succeeds */
1341 fc->fcoe_pending_queue.qlen++;
1342 skb = __skb_dequeue(&fc->fcoe_pending_queue);
1344 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
1345 rc = fcoe_start_io(skb);
1346 spin_lock_bh(&fc->fcoe_pending_queue.lock);
1349 __skb_queue_head(&fc->fcoe_pending_queue, skb);
1350 /* undo temporary increment above */
1351 fc->fcoe_pending_queue.qlen--;
1354 /* undo temporary increment above */
1355 fc->fcoe_pending_queue.qlen--;
1358 if (fc->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH)
1360 if (fc->fcoe_pending_queue.qlen && !timer_pending(&fc->timer))
1361 mod_timer(&fc->timer, jiffies + 2);
1362 fc->fcoe_pending_queue_active = 0;
1364 if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
1366 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
1371 * fcoe_dev_setup() - setup link change notification interface
1373 static void fcoe_dev_setup(void)
1375 register_netdevice_notifier(&fcoe_notifier);
1379 * fcoe_dev_cleanup() - cleanup link change notification interface
1381 static void fcoe_dev_cleanup(void)
1383 unregister_netdevice_notifier(&fcoe_notifier);
1387 * fcoe_device_notification() - netdev event notification callback
1388 * @notifier: context of the notification
1389 * @event: type of event
1390 * @ptr: fixed array for output parsed ifname
1392 * This function is called by the ethernet driver in case of link change event
1394 * Returns: 0 for success
1396 static int fcoe_device_notification(struct notifier_block *notifier,
1397 ulong event, void *ptr)
1399 struct fc_lport *lp = NULL;
1400 struct net_device *real_dev = ptr;
1401 struct fcoe_softc *fc;
1402 struct fcoe_dev_stats *stats;
1403 u32 link_possible = 1;
1407 read_lock(&fcoe_hostlist_lock);
1408 list_for_each_entry(fc, &fcoe_hostlist, list) {
1409 if (fc->real_dev == real_dev) {
1414 read_unlock(&fcoe_hostlist_lock);
1422 case NETDEV_GOING_DOWN:
1428 case NETDEV_CHANGEMTU:
1429 mfs = fc->real_dev->mtu -
1430 (sizeof(struct fcoe_hdr) +
1431 sizeof(struct fcoe_crc_eof));
1432 if (mfs >= FC_MIN_MAX_FRAME)
1433 fc_set_mfs(lp, mfs);
1435 case NETDEV_REGISTER:
1438 FCOE_NETDEV_DBG(real_dev, "Unknown event %ld "
1439 "from netdev netlink\n", event);
1441 if (link_possible && !fcoe_link_ok(lp))
1442 fcoe_ctlr_link_up(&fc->ctlr);
1443 else if (fcoe_ctlr_link_down(&fc->ctlr)) {
1444 stats = fc_lport_get_stats(lp);
1445 stats->LinkFailureCount++;
1446 fcoe_clean_pending_queue(lp);
1453 * fcoe_if_to_netdev() - parse a name buffer to get netdev
1454 * @buffer: incoming buffer to be copied
1456 * Returns: NULL or ptr to net_device
1458 static struct net_device *fcoe_if_to_netdev(const char *buffer)
1461 char ifname[IFNAMSIZ + 2];
1464 strlcpy(ifname, buffer, IFNAMSIZ);
1465 cp = ifname + strlen(ifname);
1466 while (--cp >= ifname && *cp == '\n')
1468 return dev_get_by_name(&init_net, ifname);
1474 * fcoe_netdev_to_module_owner() - finds out the driver module of the netdev
1475 * @netdev: the target netdev
1477 * Returns: ptr to the struct module, NULL for failure
1479 static struct module *
1480 fcoe_netdev_to_module_owner(const struct net_device *netdev)
1487 dev = netdev->dev.parent;
1494 return dev->driver->owner;
1498 * fcoe_ethdrv_get() - Hold the Ethernet driver
1499 * @netdev: the target netdev
1501 * Holds the Ethernet driver module by try_module_get() for
1502 * the corresponding netdev.
1504 * Returns: 0 for success
1506 static int fcoe_ethdrv_get(const struct net_device *netdev)
1508 struct module *owner;
1510 owner = fcoe_netdev_to_module_owner(netdev);
1512 FCOE_NETDEV_DBG(netdev, "Hold driver module %s\n",
1513 module_name(owner));
1514 return try_module_get(owner);
1520 * fcoe_ethdrv_put() - Release the Ethernet driver
1521 * @netdev: the target netdev
1523 * Releases the Ethernet driver module by module_put for
1524 * the corresponding netdev.
1526 * Returns: 0 for success
1528 static int fcoe_ethdrv_put(const struct net_device *netdev)
1530 struct module *owner;
1532 owner = fcoe_netdev_to_module_owner(netdev);
1534 FCOE_NETDEV_DBG(netdev, "Release driver module %s\n",
1535 module_name(owner));
1543 * fcoe_destroy() - handles the destroy from sysfs
1544 * @buffer: expected to be an eth if name
1545 * @kp: associated kernel param
1547 * Returns: 0 for success
1549 static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
1552 struct net_device *netdev;
1554 netdev = fcoe_if_to_netdev(buffer);
1559 /* look for existing lport */
1560 if (!fcoe_hostlist_lookup(netdev)) {
1564 rc = fcoe_if_destroy(netdev);
1566 printk(KERN_ERR "fcoe: Failed to destroy interface (%s)\n",
1571 fcoe_ethdrv_put(netdev);
1580 * fcoe_create() - Handles the create call from sysfs
1581 * @buffer: expected to be an eth if name
1582 * @kp: associated kernel param
1584 * Returns: 0 for success
1586 static int fcoe_create(const char *buffer, struct kernel_param *kp)
1589 struct net_device *netdev;
1591 netdev = fcoe_if_to_netdev(buffer);
1596 /* look for existing lport */
1597 if (fcoe_hostlist_lookup(netdev)) {
1601 fcoe_ethdrv_get(netdev);
1603 rc = fcoe_if_create(netdev);
1605 printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
1607 fcoe_ethdrv_put(netdev);
1618 module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR);
1619 __MODULE_PARM_TYPE(create, "string");
1620 MODULE_PARM_DESC(create, "Create fcoe port using net device passed in.");
1621 module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR);
1622 __MODULE_PARM_TYPE(destroy, "string");
1623 MODULE_PARM_DESC(destroy, "Destroy fcoe port");
1626 * fcoe_link_ok() - Check if link is ok for the fc_lport
1627 * @lp: ptr to the fc_lport
1629 * Any permanently-disqualifying conditions have been previously checked.
1630 * This also updates the speed setting, which may change with link for 100/1000.
1632 * This function should probably be checking for PAUSE support at some point
1633 * in the future. Currently Per-priority-pause is not determinable using
1634 * ethtool, so we shouldn't be restrictive until that problem is resolved.
1636 * Returns: 0 if link is OK for use by FCoE.
1639 int fcoe_link_ok(struct fc_lport *lp)
1641 struct fcoe_softc *fc = lport_priv(lp);
1642 struct net_device *dev = fc->real_dev;
1643 struct ethtool_cmd ecmd = { ETHTOOL_GSET };
1645 if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
1646 (!dev_ethtool_get_settings(dev, &ecmd))) {
1647 lp->link_supported_speeds &=
1648 ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
1649 if (ecmd.supported & (SUPPORTED_1000baseT_Half |
1650 SUPPORTED_1000baseT_Full))
1651 lp->link_supported_speeds |= FC_PORTSPEED_1GBIT;
1652 if (ecmd.supported & SUPPORTED_10000baseT_Full)
1653 lp->link_supported_speeds |=
1654 FC_PORTSPEED_10GBIT;
1655 if (ecmd.speed == SPEED_1000)
1656 lp->link_speed = FC_PORTSPEED_1GBIT;
1657 if (ecmd.speed == SPEED_10000)
1658 lp->link_speed = FC_PORTSPEED_10GBIT;
1666 * fcoe_percpu_clean() - Clear the pending skbs for an lport
1669 void fcoe_percpu_clean(struct fc_lport *lp)
1671 struct fcoe_percpu_s *pp;
1672 struct fcoe_rcv_info *fr;
1673 struct sk_buff_head *list;
1674 struct sk_buff *skb, *next;
1675 struct sk_buff *head;
1678 for_each_possible_cpu(cpu) {
1679 pp = &per_cpu(fcoe_percpu, cpu);
1680 spin_lock_bh(&pp->fcoe_rx_list.lock);
1681 list = &pp->fcoe_rx_list;
1683 for (skb = head; skb != (struct sk_buff *)list;
1686 fr = fcoe_dev_from_skb(skb);
1687 if (fr->fr_dev == lp) {
1688 __skb_unlink(skb, list);
1692 spin_unlock_bh(&pp->fcoe_rx_list.lock);
1697 * fcoe_clean_pending_queue() - Dequeue a skb and free it
1698 * @lp: the corresponding fc_lport
1702 void fcoe_clean_pending_queue(struct fc_lport *lp)
1704 struct fcoe_softc *fc = lport_priv(lp);
1705 struct sk_buff *skb;
1707 spin_lock_bh(&fc->fcoe_pending_queue.lock);
1708 while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) {
1709 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
1711 spin_lock_bh(&fc->fcoe_pending_queue.lock);
1713 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
1717 * fcoe_reset() - Resets the fcoe
1718 * @shost: shost the reset is from
1722 int fcoe_reset(struct Scsi_Host *shost)
1724 struct fc_lport *lport = shost_priv(shost);
1725 fc_lport_reset(lport);
1730 * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device
1731 * @dev: this is currently ptr to net_device
1733 * Called with fcoe_hostlist_lock held.
1735 * Returns: NULL or the located fcoe_softc
1737 static struct fcoe_softc *
1738 fcoe_hostlist_lookup_softc(const struct net_device *dev)
1740 struct fcoe_softc *fc;
1742 list_for_each_entry(fc, &fcoe_hostlist, list) {
1743 if (fc->real_dev == dev)
1750 * fcoe_hostlist_lookup() - Find the corresponding lport by netdev
1751 * @netdev: ptr to net_device
1753 * Returns: 0 for success
1755 struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
1757 struct fcoe_softc *fc;
1759 read_lock(&fcoe_hostlist_lock);
1760 fc = fcoe_hostlist_lookup_softc(netdev);
1761 read_unlock(&fcoe_hostlist_lock);
1763 return (fc) ? fc->ctlr.lp : NULL;
1767 * fcoe_hostlist_add() - Add a lport to lports list
1768 * @lp: ptr to the fc_lport to be added
1770 * Called with write fcoe_hostlist_lock held.
1772 * Returns: 0 for success
1774 int fcoe_hostlist_add(const struct fc_lport *lp)
1776 struct fcoe_softc *fc;
1778 fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
1780 fc = lport_priv(lp);
1781 list_add_tail(&fc->list, &fcoe_hostlist);
1787 * fcoe_hostlist_remove() - remove a lport from lports list
1788 * @lp: ptr to the fc_lport to be removed
1790 * Returns: 0 for success
1792 int fcoe_hostlist_remove(const struct fc_lport *lp)
1794 struct fcoe_softc *fc;
1796 write_lock_bh(&fcoe_hostlist_lock);
1797 fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
1799 list_del(&fc->list);
1800 write_unlock_bh(&fcoe_hostlist_lock);
1806 * fcoe_init() - fcoe module loading initialization
1808 * Returns 0 on success, negative on failure
1810 static int __init fcoe_init(void)
1814 struct fcoe_percpu_s *p;
1816 INIT_LIST_HEAD(&fcoe_hostlist);
1817 rwlock_init(&fcoe_hostlist_lock);
1819 for_each_possible_cpu(cpu) {
1820 p = &per_cpu(fcoe_percpu, cpu);
1821 skb_queue_head_init(&p->fcoe_rx_list);
1824 for_each_online_cpu(cpu)
1825 fcoe_percpu_thread_create(cpu);
1827 /* Initialize per CPU interrupt thread */
1828 rc = register_hotcpu_notifier(&fcoe_cpu_notifier);
1832 /* Setup link change notification */
1840 for_each_online_cpu(cpu) {
1841 fcoe_percpu_thread_destroy(cpu);
1846 module_init(fcoe_init);
1849 * fcoe_exit() - fcoe module unloading cleanup
1851 * Returns 0 on success, negative on failure
1853 static void __exit fcoe_exit(void)
1856 struct fcoe_softc *fc, *tmp;
1860 /* releases the associated fcoe hosts */
1861 list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list)
1862 fcoe_if_destroy(fc->real_dev);
1864 unregister_hotcpu_notifier(&fcoe_cpu_notifier);
1866 for_each_online_cpu(cpu) {
1867 fcoe_percpu_thread_destroy(cpu);
1870 /* detach from scsi transport */
1873 module_exit(fcoe_exit);