2 * Copyright(c) 2007 - 2009 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");
52 /* Performance tuning parameters for fcoe */
53 static unsigned int fcoe_ddp_min;
54 module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR);
55 MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for " \
56 "Direct Data Placement (DDP).");
59 LIST_HEAD(fcoe_hostlist);
60 DEFINE_RWLOCK(fcoe_hostlist_lock);
61 DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
63 /* Function Prototypes */
64 static int fcoe_reset(struct Scsi_Host *shost);
65 static int fcoe_xmit(struct fc_lport *, struct fc_frame *);
66 static int fcoe_rcv(struct sk_buff *, struct net_device *,
67 struct packet_type *, struct net_device *);
68 static int fcoe_percpu_receive_thread(void *arg);
69 static void fcoe_clean_pending_queue(struct fc_lport *lp);
70 static void fcoe_percpu_clean(struct fc_lport *lp);
71 static int fcoe_link_ok(struct fc_lport *lp);
73 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *);
74 static int fcoe_hostlist_add(const struct fc_lport *);
75 static int fcoe_hostlist_remove(const struct fc_lport *);
77 static void fcoe_check_wait_queue(struct fc_lport *, struct sk_buff *);
78 static int fcoe_device_notification(struct notifier_block *, ulong, void *);
79 static void fcoe_dev_setup(void);
80 static void fcoe_dev_cleanup(void);
82 /* notification function from net device */
83 static struct notifier_block fcoe_notifier = {
84 .notifier_call = fcoe_device_notification,
87 static struct scsi_transport_template *scsi_transport_fcoe_sw;
89 struct fc_function_template fcoe_transport_function = {
90 .show_host_node_name = 1,
91 .show_host_port_name = 1,
92 .show_host_supported_classes = 1,
93 .show_host_supported_fc4s = 1,
94 .show_host_active_fc4s = 1,
95 .show_host_maxframe_size = 1,
97 .show_host_port_id = 1,
98 .show_host_supported_speeds = 1,
99 .get_host_speed = fc_get_host_speed,
100 .show_host_speed = 1,
101 .show_host_port_type = 1,
102 .get_host_port_state = fc_get_host_port_state,
103 .show_host_port_state = 1,
104 .show_host_symbolic_name = 1,
106 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
107 .show_rport_maxframe_size = 1,
108 .show_rport_supported_classes = 1,
110 .show_host_fabric_name = 1,
111 .show_starget_node_name = 1,
112 .show_starget_port_name = 1,
113 .show_starget_port_id = 1,
114 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
115 .show_rport_dev_loss_tmo = 1,
116 .get_fc_host_stats = fc_get_host_stats,
117 .issue_fc_host_lip = fcoe_reset,
119 .terminate_rport_io = fc_rport_terminate_io,
122 static struct scsi_host_template fcoe_shost_template = {
123 .module = THIS_MODULE,
124 .name = "FCoE Driver",
125 .proc_name = FCOE_NAME,
126 .queuecommand = fc_queuecommand,
127 .eh_abort_handler = fc_eh_abort,
128 .eh_device_reset_handler = fc_eh_device_reset,
129 .eh_host_reset_handler = fc_eh_host_reset,
130 .slave_alloc = fc_slave_alloc,
131 .change_queue_depth = fc_change_queue_depth,
132 .change_queue_type = fc_change_queue_type,
135 .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
136 .use_clustering = ENABLE_CLUSTERING,
137 .sg_tablesize = SG_ALL,
138 .max_sectors = 0xffff,
142 * fcoe_fip_recv - handle a received FIP frame.
143 * @skb: the receive skb
144 * @dev: associated &net_device
145 * @ptype: the &packet_type structure which was used to register this handler.
146 * @orig_dev: original receive &net_device, in case @dev is a bond.
148 * Returns: 0 for success
150 static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *dev,
151 struct packet_type *ptype,
152 struct net_device *orig_dev)
154 struct fcoe_interface *fcoe;
156 fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type);
157 fcoe_ctlr_recv(&fcoe->ctlr, skb);
162 * fcoe_fip_send() - send an Ethernet-encapsulated FIP frame.
163 * @fip: FCoE controller.
166 static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
168 skb->dev = fcoe_from_ctlr(fip)->netdev;
173 * fcoe_update_src_mac() - Update Ethernet MAC filters.
174 * @fip: FCoE controller.
175 * @old: Unicast MAC address to delete if the MAC is non-zero.
176 * @new: Unicast MAC address to add.
178 * Remove any previously-set unicast MAC filter.
179 * Add secondary FCoE MAC address filter for our OUI.
181 static void fcoe_update_src_mac(struct fcoe_ctlr *fip, u8 *old, u8 *new)
183 struct fcoe_interface *fcoe;
185 fcoe = fcoe_from_ctlr(fip);
187 if (!is_zero_ether_addr(old))
188 dev_unicast_delete(fcoe->netdev, old);
189 dev_unicast_add(fcoe->netdev, new);
194 * fcoe_lport_config() - sets up the fc_lport
195 * @lp: ptr to the fc_lport
197 * Returns: 0 for success
199 static int fcoe_lport_config(struct fc_lport *lp)
203 lp->max_retry_count = 3;
204 lp->max_rport_retry_count = 3;
205 lp->e_d_tov = 2 * 1000; /* FC-FS default */
206 lp->r_a_tov = 2 * 2 * 1000;
207 lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
208 FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
210 fc_lport_init_stats(lp);
212 /* lport fc_lport related configuration */
215 /* offload related configuration */
226 * fcoe_netdev_cleanup() - clean up netdev configurations
227 * @port: ptr to the fcoe_port
229 void fcoe_netdev_cleanup(struct fcoe_port *port)
231 u8 flogi_maddr[ETH_ALEN];
232 struct fcoe_interface *fcoe = port->fcoe;
234 /* Don't listen for Ethernet packets anymore */
235 dev_remove_pack(&fcoe->fcoe_packet_type);
236 dev_remove_pack(&fcoe->fip_packet_type);
238 /* Delete secondary MAC addresses */
240 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
241 dev_unicast_delete(fcoe->netdev, flogi_maddr);
242 if (!is_zero_ether_addr(fcoe->ctlr.data_src_addr))
243 dev_unicast_delete(fcoe->netdev, fcoe->ctlr.data_src_addr);
245 dev_unicast_delete(fcoe->netdev, fcoe->ctlr.ctl_src_addr);
246 dev_mc_delete(fcoe->netdev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0);
251 * fcoe_queue_timer() - fcoe queue timer
252 * @lp: the fc_lport pointer
254 * Calls fcoe_check_wait_queue on timeout
257 static void fcoe_queue_timer(ulong lp)
259 fcoe_check_wait_queue((struct fc_lport *)lp, NULL);
263 * fcoe_netdev_config() - Set up netdev for SW FCoE
264 * @lp : ptr to the fc_lport
265 * @netdev : ptr to the associated netdevice struct
267 * Must be called after fcoe_lport_config() as it will use lport mutex
269 * Returns : 0 for success
271 static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev)
275 struct fcoe_interface *fcoe;
276 struct fcoe_port *port;
277 u8 flogi_maddr[ETH_ALEN];
278 struct netdev_hw_addr *ha;
280 /* Setup lport private data to point to fcoe softc */
281 port = lport_priv(lp);
284 fcoe->netdev = netdev;
286 /* Do not support for bonding device */
287 if ((netdev->priv_flags & IFF_MASTER_ALB) ||
288 (netdev->priv_flags & IFF_SLAVE_INACTIVE) ||
289 (netdev->priv_flags & IFF_MASTER_8023AD)) {
294 * Determine max frame size based on underlying device and optional
295 * user-configured limit. If the MFS is too low, fcoe_link_ok()
296 * will return 0, so do this first.
298 mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
299 sizeof(struct fcoe_crc_eof));
300 if (fc_set_mfs(lp, mfs))
303 /* offload features support */
304 if (netdev->features & NETIF_F_SG)
307 if (netdev->features & NETIF_F_FCOE_CRC) {
309 FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
311 if (netdev->features & NETIF_F_FSO) {
313 lp->lso_max = netdev->gso_max_size;
314 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(&port->fcoe_pending_queue);
324 port->fcoe_pending_queue_active = 0;
325 setup_timer(&port->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(fcoe->ctlr.ctl_src_addr))) {
333 memcpy(fcoe->ctlr.ctl_src_addr, ha->addr, ETH_ALEN);
340 /* setup Source Mac Address */
341 if (!fcoe->ctlr.spma)
342 memcpy(fcoe->ctlr.ctl_src_addr, netdev->dev_addr,
345 wwnn = fcoe_wwn_from_mac(netdev->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(netdev->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(netdev, flogi_maddr);
360 dev_unicast_add(netdev, fcoe->ctlr.ctl_src_addr);
361 dev_mc_add(netdev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0);
365 * setup the receive function from ethernet driver
366 * on the ethertype for the given device
368 fcoe->fcoe_packet_type.func = fcoe_rcv;
369 fcoe->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
370 fcoe->fcoe_packet_type.dev = netdev;
371 dev_add_pack(&fcoe->fcoe_packet_type);
373 fcoe->fip_packet_type.func = fcoe_fip_recv;
374 fcoe->fip_packet_type.type = htons(ETH_P_FIP);
375 fcoe->fip_packet_type.dev = netdev;
376 dev_add_pack(&fcoe->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_oem_match() - match for read types IO
420 * @fp: the fc_frame for new IO.
422 * Returns : true for read types IO, otherwise returns false.
424 bool fcoe_oem_match(struct fc_frame *fp)
426 return fc_fcp_is_read(fr_fsp(fp)) &&
427 (fr_fsp(fp)->data_len > fcoe_ddp_min);
431 * fcoe_em_config() - allocates em for this lport
432 * @lp: the fcoe that em is to allocated for
434 * Called with write fcoe_hostlist_lock held.
436 * Returns : 0 on success
438 static inline int fcoe_em_config(struct fc_lport *lp)
440 struct fcoe_port *port = lport_priv(lp);
441 struct fcoe_port *oldport = NULL;
442 struct fcoe_interface *fcoe = port->fcoe;
443 struct fcoe_interface *oldfcoe = NULL;
444 struct net_device *old_real_dev, *cur_real_dev;
445 u16 min_xid = FCOE_MIN_XID;
446 u16 max_xid = FCOE_MAX_XID;
449 * Check if need to allocate an em instance for
450 * offload exchange ids to be shared across all VN_PORTs/lport.
452 if (!lp->lro_enabled || !lp->lro_xid || (lp->lro_xid >= max_xid)) {
458 * Reuse existing offload em instance in case
459 * it is already allocated on real eth device
461 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
462 cur_real_dev = vlan_dev_real_dev(fcoe->netdev);
464 cur_real_dev = fcoe->netdev;
466 list_for_each_entry(oldfcoe, &fcoe_hostlist, list) {
467 oldport = oldfcoe->priv;
468 if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
469 old_real_dev = vlan_dev_real_dev(oldfcoe->netdev);
471 old_real_dev = oldfcoe->netdev;
473 if (cur_real_dev == old_real_dev) {
474 port->oem = oldport->oem;
480 if (!fc_exch_mgr_add(lp, port->oem, fcoe_oem_match)) {
481 printk(KERN_ERR "fcoe_em_config: failed to add "
482 "offload em:%p on interface:%s\n",
483 port->oem, fcoe->netdev->name);
487 port->oem = fc_exch_mgr_alloc(lp, FC_CLASS_3,
488 FCOE_MIN_XID, lp->lro_xid,
491 printk(KERN_ERR "fcoe_em_config: failed to allocate "
492 "em for offload exches on interface:%s\n",
499 * Exclude offload EM xid range from next EM xid range.
501 min_xid += lp->lro_xid + 1;
504 if (!fc_exch_mgr_alloc(lp, FC_CLASS_3, min_xid, max_xid, NULL)) {
505 printk(KERN_ERR "fcoe_em_config: failed to "
506 "allocate em on interface %s\n", fcoe->netdev->name);
514 * fcoe_if_destroy() - FCoE software HBA tear-down function
515 * @lport: fc_lport to destroy
517 static void fcoe_if_destroy(struct fc_lport *lport)
519 struct fcoe_port *port = lport_priv(lport);
520 struct fcoe_interface *fcoe = port->fcoe;
521 struct net_device *netdev = fcoe->netdev;
523 FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
525 /* Logout of the fabric */
526 fc_fabric_logoff(lport);
528 /* Remove the instance from fcoe's list */
529 fcoe_hostlist_remove(lport);
531 /* clean up netdev configurations */
532 fcoe_netdev_cleanup(port);
534 /* tear-down the FCoE controller */
535 fcoe_ctlr_destroy(&fcoe->ctlr);
537 /* Free queued packets for the per-CPU receive threads */
538 fcoe_percpu_clean(lport);
540 /* Cleanup the fc_lport */
541 fc_lport_destroy(lport);
542 fc_fcp_destroy(lport);
544 /* Detach from the scsi-ml */
545 fc_remove_host(lport->host);
546 scsi_remove_host(lport->host);
548 /* There are no more rports or I/O, free the EM */
549 fc_exch_mgr_free(lport);
551 /* Free existing skbs */
552 fcoe_clean_pending_queue(lport);
555 del_timer_sync(&port->timer);
557 /* Free memory used by statistical counters */
558 fc_lport_free_stats(lport);
560 /* Release the net_device and Scsi_Host */
562 scsi_host_put(lport->host);
563 kfree(fcoe); /* TODO, should be refcounted */
567 * fcoe_ddp_setup - calls LLD's ddp_setup through net_device
568 * @lp: the corresponding fc_lport
569 * @xid: the exchange id for this ddp transfer
570 * @sgl: the scatterlist describing this transfer
571 * @sgc: number of sg items
575 static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid,
576 struct scatterlist *sgl, unsigned int sgc)
578 struct net_device *n = fcoe_netdev(lp);
580 if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_setup)
581 return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc);
587 * fcoe_ddp_done - calls LLD's ddp_done through net_device
588 * @lp: the corresponding fc_lport
589 * @xid: the exchange id for this ddp transfer
591 * Returns : the length of data that have been completed by ddp
593 static int fcoe_ddp_done(struct fc_lport *lp, u16 xid)
595 struct net_device *n = fcoe_netdev(lp);
597 if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_done)
598 return n->netdev_ops->ndo_fcoe_ddp_done(n, xid);
602 static struct libfc_function_template fcoe_libfc_fcn_templ = {
603 .frame_send = fcoe_xmit,
604 .ddp_setup = fcoe_ddp_setup,
605 .ddp_done = fcoe_ddp_done,
609 * fcoe_if_create() - this function creates the fcoe interface
610 * @netdev: pointer the associated netdevice
611 * @parent: device pointer to be the parent in sysfs for the SCSI host
613 * Creates fc_lport struct and scsi_host for lport, configures lport
614 * and starts fabric login.
616 * Returns : The allocated fc_lport or an error pointer
618 static struct fc_lport *fcoe_if_create(struct net_device *netdev,
619 struct device *parent)
622 struct fc_lport *lport = NULL;
623 struct fcoe_port *port;
624 struct fcoe_interface *fcoe;
625 struct Scsi_Host *shost;
627 FCOE_NETDEV_DBG(netdev, "Create Interface\n");
629 fcoe = kzalloc(sizeof(*fcoe), GFP_KERNEL);
631 FCOE_NETDEV_DBG(netdev, "Could not allocate fcoe structure\n");
636 shost = libfc_host_alloc(&fcoe_shost_template,
637 sizeof(struct fcoe_port));
639 FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n");
643 lport = shost_priv(shost);
644 port = lport_priv(lport);
649 /* configure fc_lport, e.g., em */
650 rc = fcoe_lport_config(lport);
652 FCOE_NETDEV_DBG(netdev, "Could not configure lport for the "
660 fcoe_ctlr_init(&fcoe->ctlr);
661 fcoe->ctlr.send = fcoe_fip_send;
662 fcoe->ctlr.update_mac = fcoe_update_src_mac;
664 /* configure lport network properties */
665 rc = fcoe_netdev_config(lport, netdev);
667 FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the "
669 goto out_netdev_cleanup;
672 /* configure lport scsi host properties */
673 rc = fcoe_shost_config(lport, shost, parent);
675 FCOE_NETDEV_DBG(netdev, "Could not configure shost for the "
677 goto out_netdev_cleanup;
680 /* Initialize the library */
681 rc = fcoe_libfc_config(lport, &fcoe_libfc_fcn_templ);
683 FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the "
689 * fcoe_em_alloc() and fcoe_hostlist_add() both
690 * need to be atomic under fcoe_hostlist_lock
691 * since fcoe_em_alloc() looks for an existing EM
692 * instance on host list updated by fcoe_hostlist_add().
694 write_lock(&fcoe_hostlist_lock);
695 /* lport exch manager allocation */
696 rc = fcoe_em_config(lport);
698 FCOE_NETDEV_DBG(netdev, "Could not configure the EM for the "
703 /* add to lports list */
704 fcoe_hostlist_add(lport);
705 write_unlock(&fcoe_hostlist_lock);
707 lport->boot_time = jiffies;
709 fc_fabric_login(lport);
711 if (!fcoe_link_ok(lport))
712 fcoe_ctlr_link_up(&fcoe->ctlr);
719 fc_exch_mgr_free(lport);
721 fcoe_netdev_cleanup(port);
723 scsi_host_put(lport->host);
731 * fcoe_if_init() - attach to scsi transport
733 * Returns : 0 on success
735 static int __init fcoe_if_init(void)
737 /* attach to scsi transport */
738 scsi_transport_fcoe_sw =
739 fc_attach_transport(&fcoe_transport_function);
741 if (!scsi_transport_fcoe_sw) {
742 printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n");
750 * fcoe_if_exit() - detach from scsi transport
752 * Returns : 0 on success
754 int __exit fcoe_if_exit(void)
756 fc_release_transport(scsi_transport_fcoe_sw);
761 * fcoe_percpu_thread_create() - Create a receive thread for an online cpu
762 * @cpu: cpu index for the online cpu
764 static void fcoe_percpu_thread_create(unsigned int cpu)
766 struct fcoe_percpu_s *p;
767 struct task_struct *thread;
769 p = &per_cpu(fcoe_percpu, cpu);
771 thread = kthread_create(fcoe_percpu_receive_thread,
772 (void *)p, "fcoethread/%d", cpu);
774 if (likely(!IS_ERR(p->thread))) {
775 kthread_bind(thread, cpu);
776 wake_up_process(thread);
778 spin_lock_bh(&p->fcoe_rx_list.lock);
780 spin_unlock_bh(&p->fcoe_rx_list.lock);
785 * fcoe_percpu_thread_destroy() - removes the rx thread for the given cpu
786 * @cpu: cpu index the rx thread is to be removed
788 * Destroys a per-CPU Rx thread. Any pending skbs are moved to the
789 * current CPU's Rx thread. If the thread being destroyed is bound to
790 * the CPU processing this context the skbs will be freed.
792 static void fcoe_percpu_thread_destroy(unsigned int cpu)
794 struct fcoe_percpu_s *p;
795 struct task_struct *thread;
796 struct page *crc_eof;
799 struct fcoe_percpu_s *p0;
800 unsigned targ_cpu = smp_processor_id();
801 #endif /* CONFIG_SMP */
803 FCOE_DBG("Destroying receive thread for CPU %d\n", cpu);
805 /* Prevent any new skbs from being queued for this CPU. */
806 p = &per_cpu(fcoe_percpu, cpu);
807 spin_lock_bh(&p->fcoe_rx_list.lock);
810 crc_eof = p->crc_eof_page;
811 p->crc_eof_page = NULL;
812 p->crc_eof_offset = 0;
813 spin_unlock_bh(&p->fcoe_rx_list.lock);
817 * Don't bother moving the skb's if this context is running
818 * on the same CPU that is having its thread destroyed. This
819 * can easily happen when the module is removed.
821 if (cpu != targ_cpu) {
822 p0 = &per_cpu(fcoe_percpu, targ_cpu);
823 spin_lock_bh(&p0->fcoe_rx_list.lock);
825 FCOE_DBG("Moving frames from CPU %d to CPU %d\n",
828 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
829 __skb_queue_tail(&p0->fcoe_rx_list, skb);
830 spin_unlock_bh(&p0->fcoe_rx_list.lock);
833 * The targeted CPU is not initialized and cannot accept
834 * new skbs. Unlock the targeted CPU and drop the skbs
835 * on the CPU that is going offline.
837 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
839 spin_unlock_bh(&p0->fcoe_rx_list.lock);
843 * This scenario occurs when the module is being removed
844 * and all threads are being destroyed. skbs will continue
845 * to be shifted from the CPU thread that is being removed
846 * to the CPU thread associated with the CPU that is processing
847 * the module removal. Once there is only one CPU Rx thread it
848 * will reach this case and we will drop all skbs and later
851 spin_lock_bh(&p->fcoe_rx_list.lock);
852 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
854 spin_unlock_bh(&p->fcoe_rx_list.lock);
858 * This a non-SMP scenario where the singular Rx thread is
859 * being removed. Free all skbs and stop the thread.
861 spin_lock_bh(&p->fcoe_rx_list.lock);
862 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
864 spin_unlock_bh(&p->fcoe_rx_list.lock);
868 kthread_stop(thread);
875 * fcoe_cpu_callback() - fcoe cpu hotplug event callback
876 * @nfb: callback data block
877 * @action: event triggering the callback
878 * @hcpu: index for the cpu of this event
880 * This creates or destroys per cpu data for fcoe
882 * Returns NOTIFY_OK always.
884 static int fcoe_cpu_callback(struct notifier_block *nfb,
885 unsigned long action, void *hcpu)
887 unsigned cpu = (unsigned long)hcpu;
891 case CPU_ONLINE_FROZEN:
892 FCOE_DBG("CPU %x online: Create Rx thread\n", cpu);
893 fcoe_percpu_thread_create(cpu);
896 case CPU_DEAD_FROZEN:
897 FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu);
898 fcoe_percpu_thread_destroy(cpu);
906 static struct notifier_block fcoe_cpu_notifier = {
907 .notifier_call = fcoe_cpu_callback,
911 * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ
912 * @skb: the receive skb
913 * @dev: associated net device
915 * @olddev: last device
917 * this function will receive the packet and build fc frame and pass it up
919 * Returns: 0 for success
921 int fcoe_rcv(struct sk_buff *skb, struct net_device *dev,
922 struct packet_type *ptype, struct net_device *olddev)
925 struct fcoe_rcv_info *fr;
926 struct fcoe_interface *fcoe;
927 struct fc_frame_header *fh;
928 struct fcoe_percpu_s *fps;
931 fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type);
933 if (unlikely(lp == NULL)) {
934 FCOE_NETDEV_DBG(dev, "Cannot find hba structure");
940 FCOE_NETDEV_DBG(dev, "skb_info: len:%d data_len:%d head:%p "
941 "data:%p tail:%p end:%p sum:%d dev:%s",
942 skb->len, skb->data_len, skb->head, skb->data,
943 skb_tail_pointer(skb), skb_end_pointer(skb),
944 skb->csum, skb->dev ? skb->dev->name : "<NULL>");
946 /* check for FCOE packet type */
947 if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) {
948 FCOE_NETDEV_DBG(dev, "Wrong FC type frame");
953 * Check for minimum frame length, and make sure required FCoE
954 * and FC headers are pulled into the linear data area.
956 if (unlikely((skb->len < FCOE_MIN_FRAME) ||
957 !pskb_may_pull(skb, FCOE_HEADER_LEN)))
960 skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
961 fh = (struct fc_frame_header *) skb_transport_header(skb);
963 fr = fcoe_dev_from_skb(skb);
968 * In case the incoming frame's exchange is originated from
969 * the initiator, then received frame's exchange id is ANDed
970 * with fc_cpu_mask bits to get the same cpu on which exchange
971 * was originated, otherwise just use the current cpu.
973 if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)
974 cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask;
976 cpu = smp_processor_id();
978 fps = &per_cpu(fcoe_percpu, cpu);
979 spin_lock_bh(&fps->fcoe_rx_list.lock);
980 if (unlikely(!fps->thread)) {
982 * The targeted CPU is not ready, let's target
983 * the first CPU now. For non-SMP systems this
984 * will check the same CPU twice.
986 FCOE_NETDEV_DBG(dev, "CPU is online, but no receive thread "
987 "ready for incoming skb- using first online "
990 spin_unlock_bh(&fps->fcoe_rx_list.lock);
991 cpu = first_cpu(cpu_online_map);
992 fps = &per_cpu(fcoe_percpu, cpu);
993 spin_lock_bh(&fps->fcoe_rx_list.lock);
995 spin_unlock_bh(&fps->fcoe_rx_list.lock);
1001 * We now have a valid CPU that we're targeting for
1002 * this skb. We also have this receive thread locked,
1003 * so we're free to queue skbs into it's queue.
1005 __skb_queue_tail(&fps->fcoe_rx_list, skb);
1006 if (fps->fcoe_rx_list.qlen == 1)
1007 wake_up_process(fps->thread);
1009 spin_unlock_bh(&fps->fcoe_rx_list.lock);
1013 fc_lport_get_stats(lp)->ErrorFrames++;
1021 * fcoe_start_io() - pass to netdev to start xmit for fcoe
1022 * @skb: the skb to be xmitted
1024 * Returns: 0 for success
1026 static inline int fcoe_start_io(struct sk_buff *skb)
1031 rc = dev_queue_xmit(skb);
1039 * fcoe_get_paged_crc_eof() - in case we need to alloc a page for crc_eof
1040 * @skb: the skb to be xmitted
1043 * Returns: 0 for success
1045 static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
1047 struct fcoe_percpu_s *fps;
1050 fps = &get_cpu_var(fcoe_percpu);
1051 page = fps->crc_eof_page;
1053 page = alloc_page(GFP_ATOMIC);
1055 put_cpu_var(fcoe_percpu);
1058 fps->crc_eof_page = page;
1059 fps->crc_eof_offset = 0;
1063 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
1064 fps->crc_eof_offset, tlen);
1066 skb->data_len += tlen;
1067 skb->truesize += tlen;
1068 fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);
1070 if (fps->crc_eof_offset >= PAGE_SIZE) {
1071 fps->crc_eof_page = NULL;
1072 fps->crc_eof_offset = 0;
1075 put_cpu_var(fcoe_percpu);
1080 * fcoe_fc_crc() - calculates FC CRC in this fcoe skb
1081 * @fp: the fc_frame containing data to be checksummed
1083 * This uses crc32() to calculate the crc for port frame
1084 * Return : 32 bit crc
1086 u32 fcoe_fc_crc(struct fc_frame *fp)
1088 struct sk_buff *skb = fp_skb(fp);
1089 struct skb_frag_struct *frag;
1090 unsigned char *data;
1091 unsigned long off, len, clen;
1095 crc = crc32(~0, skb->data, skb_headlen(skb));
1097 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1098 frag = &skb_shinfo(skb)->frags[i];
1099 off = frag->page_offset;
1102 clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
1103 data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
1104 KM_SKB_DATA_SOFTIRQ);
1105 crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
1106 kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
1115 * fcoe_xmit() - FCoE frame transmit function
1116 * @lp: the associated local fcoe
1117 * @fp: the fc_frame to be transmitted
1119 * Return : 0 for success
1121 int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp)
1126 struct fcoe_crc_eof *cp;
1127 struct sk_buff *skb;
1128 struct fcoe_dev_stats *stats;
1129 struct fc_frame_header *fh;
1130 unsigned int hlen; /* header length implies the version */
1131 unsigned int tlen; /* trailer length */
1132 unsigned int elen; /* eth header, may include vlan */
1133 struct fcoe_port *port = lport_priv(lp);
1134 struct fcoe_interface *fcoe = port->fcoe;
1136 struct fcoe_hdr *hp;
1138 WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
1140 fh = fc_frame_header_get(fp);
1142 wlen = skb->len / FCOE_WORD_TO_BYTE;
1149 if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) &&
1150 fcoe_ctlr_els_send(&fcoe->ctlr, skb))
1156 elen = sizeof(struct ethhdr);
1157 hlen = sizeof(struct fcoe_hdr);
1158 tlen = sizeof(struct fcoe_crc_eof);
1159 wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
1162 if (likely(lp->crc_offload)) {
1163 skb->ip_summed = CHECKSUM_PARTIAL;
1164 skb->csum_start = skb_headroom(skb);
1165 skb->csum_offset = skb->len;
1168 skb->ip_summed = CHECKSUM_NONE;
1169 crc = fcoe_fc_crc(fp);
1172 /* copy port crc and eof to the skb buff */
1173 if (skb_is_nonlinear(skb)) {
1175 if (fcoe_get_paged_crc_eof(skb, tlen)) {
1179 frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
1180 cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
1181 + frag->page_offset;
1183 cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
1186 memset(cp, 0, sizeof(*cp));
1188 cp->fcoe_crc32 = cpu_to_le32(~crc);
1190 if (skb_is_nonlinear(skb)) {
1191 kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ);
1195 /* adjust skb network/transport offsets to match mac/fcoe/port */
1196 skb_push(skb, elen + hlen);
1197 skb_reset_mac_header(skb);
1198 skb_reset_network_header(skb);
1199 skb->mac_len = elen;
1200 skb->protocol = htons(ETH_P_FCOE);
1201 skb->dev = fcoe->netdev;
1203 /* fill up mac and fcoe headers */
1205 eh->h_proto = htons(ETH_P_FCOE);
1206 if (fcoe->ctlr.map_dest)
1207 fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id);
1209 /* insert GW address */
1210 memcpy(eh->h_dest, fcoe->ctlr.dest_addr, ETH_ALEN);
1212 if (unlikely(fcoe->ctlr.flogi_oxid != FC_XID_UNKNOWN))
1213 memcpy(eh->h_source, fcoe->ctlr.ctl_src_addr, ETH_ALEN);
1215 memcpy(eh->h_source, fcoe->ctlr.data_src_addr, ETH_ALEN);
1217 hp = (struct fcoe_hdr *)(eh + 1);
1218 memset(hp, 0, sizeof(*hp));
1220 FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
1223 /* fcoe lso, mss is in max_payload which is non-zero for FCP data */
1224 if (lp->seq_offload && fr_max_payload(fp)) {
1225 skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
1226 skb_shinfo(skb)->gso_size = fr_max_payload(fp);
1228 skb_shinfo(skb)->gso_type = 0;
1229 skb_shinfo(skb)->gso_size = 0;
1231 /* update tx stats: regardless if LLD fails */
1232 stats = fc_lport_get_stats(lp);
1234 stats->TxWords += wlen;
1236 /* send down to lld */
1238 if (port->fcoe_pending_queue.qlen)
1239 fcoe_check_wait_queue(lp, skb);
1240 else if (fcoe_start_io(skb))
1241 fcoe_check_wait_queue(lp, skb);
1247 * fcoe_percpu_receive_thread() - recv thread per cpu
1248 * @arg: ptr to the fcoe per cpu struct
1250 * Return: 0 for success
1252 int fcoe_percpu_receive_thread(void *arg)
1254 struct fcoe_percpu_s *p = arg;
1256 struct fc_lport *lp;
1257 struct fcoe_rcv_info *fr;
1258 struct fcoe_dev_stats *stats;
1259 struct fc_frame_header *fh;
1260 struct sk_buff *skb;
1261 struct fcoe_crc_eof crc_eof;
1262 struct fc_frame *fp;
1264 struct fcoe_port *port;
1265 struct fcoe_hdr *hp;
1267 set_user_nice(current, -20);
1269 while (!kthread_should_stop()) {
1271 spin_lock_bh(&p->fcoe_rx_list.lock);
1272 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) {
1273 set_current_state(TASK_INTERRUPTIBLE);
1274 spin_unlock_bh(&p->fcoe_rx_list.lock);
1276 set_current_state(TASK_RUNNING);
1277 if (kthread_should_stop())
1279 spin_lock_bh(&p->fcoe_rx_list.lock);
1281 spin_unlock_bh(&p->fcoe_rx_list.lock);
1282 fr = fcoe_dev_from_skb(skb);
1284 if (unlikely(lp == NULL)) {
1285 FCOE_NETDEV_DBG(skb->dev, "Invalid HBA Structure");
1290 FCOE_NETDEV_DBG(skb->dev, "skb_info: len:%d data_len:%d "
1291 "head:%p data:%p tail:%p end:%p sum:%d dev:%s",
1292 skb->len, skb->data_len,
1293 skb->head, skb->data, skb_tail_pointer(skb),
1294 skb_end_pointer(skb), skb->csum,
1295 skb->dev ? skb->dev->name : "<NULL>");
1298 * Save source MAC address before discarding header.
1300 port = lport_priv(lp);
1301 if (skb_is_nonlinear(skb))
1302 skb_linearize(skb); /* not ideal */
1303 mac = eth_hdr(skb)->h_source;
1306 * Frame length checks and setting up the header pointers
1307 * was done in fcoe_rcv already.
1309 hp = (struct fcoe_hdr *) skb_network_header(skb);
1310 fh = (struct fc_frame_header *) skb_transport_header(skb);
1312 stats = fc_lport_get_stats(lp);
1313 if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
1314 if (stats->ErrorFrames < 5)
1315 printk(KERN_WARNING "fcoe: FCoE version "
1316 "mismatch: The frame has "
1317 "version %x, but the "
1318 "initiator supports version "
1319 "%x\n", FC_FCOE_DECAPS_VER(hp),
1321 stats->ErrorFrames++;
1326 skb_pull(skb, sizeof(struct fcoe_hdr));
1327 fr_len = skb->len - sizeof(struct fcoe_crc_eof);
1330 stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
1332 fp = (struct fc_frame *)skb;
1335 fr_sof(fp) = hp->fcoe_sof;
1337 /* Copy out the CRC and EOF trailer for access */
1338 if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) {
1342 fr_eof(fp) = crc_eof.fcoe_eof;
1343 fr_crc(fp) = crc_eof.fcoe_crc32;
1344 if (pskb_trim(skb, fr_len)) {
1350 * We only check CRC if no offload is available and if it is
1351 * it's solicited data, in which case, the FCP layer would
1352 * check it during the copy.
1354 if (lp->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY)
1355 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1357 fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
1359 fh = fc_frame_header_get(fp);
1360 if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA &&
1361 fh->fh_type == FC_TYPE_FCP) {
1362 fc_exch_recv(lp, fp);
1365 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
1366 if (le32_to_cpu(fr_crc(fp)) !=
1367 ~crc32(~0, skb->data, fr_len)) {
1368 if (stats->InvalidCRCCount < 5)
1369 printk(KERN_WARNING "fcoe: dropping "
1370 "frame with CRC error\n");
1371 stats->InvalidCRCCount++;
1372 stats->ErrorFrames++;
1376 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1378 if (unlikely(port->fcoe->ctlr.flogi_oxid != FC_XID_UNKNOWN) &&
1379 fcoe_ctlr_recv_flogi(&port->fcoe->ctlr, fp, mac)) {
1383 fc_exch_recv(lp, fp);
1389 * fcoe_check_wait_queue() - attempt to clear the transmit backlog
1392 * This empties the wait_queue, dequeue the head of the wait_queue queue
1393 * and calls fcoe_start_io() for each packet, if all skb have been
1394 * transmitted, return qlen or -1 if a error occurs, then restore
1395 * wait_queue and try again later.
1397 * The wait_queue is used when the skb transmit fails. skb will go
1398 * in the wait_queue which will be emptied by the timer function or
1399 * by the next skb transmit.
1401 static void fcoe_check_wait_queue(struct fc_lport *lp, struct sk_buff *skb)
1403 struct fcoe_port *port = lport_priv(lp);
1406 spin_lock_bh(&port->fcoe_pending_queue.lock);
1409 __skb_queue_tail(&port->fcoe_pending_queue, skb);
1411 if (port->fcoe_pending_queue_active)
1413 port->fcoe_pending_queue_active = 1;
1415 while (port->fcoe_pending_queue.qlen) {
1416 /* keep qlen > 0 until fcoe_start_io succeeds */
1417 port->fcoe_pending_queue.qlen++;
1418 skb = __skb_dequeue(&port->fcoe_pending_queue);
1420 spin_unlock_bh(&port->fcoe_pending_queue.lock);
1421 rc = fcoe_start_io(skb);
1422 spin_lock_bh(&port->fcoe_pending_queue.lock);
1425 __skb_queue_head(&port->fcoe_pending_queue, skb);
1426 /* undo temporary increment above */
1427 port->fcoe_pending_queue.qlen--;
1430 /* undo temporary increment above */
1431 port->fcoe_pending_queue.qlen--;
1434 if (port->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH)
1436 if (port->fcoe_pending_queue.qlen && !timer_pending(&port->timer))
1437 mod_timer(&port->timer, jiffies + 2);
1438 port->fcoe_pending_queue_active = 0;
1440 if (port->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
1442 spin_unlock_bh(&port->fcoe_pending_queue.lock);
1447 * fcoe_dev_setup() - setup link change notification interface
1449 static void fcoe_dev_setup(void)
1451 register_netdevice_notifier(&fcoe_notifier);
1455 * fcoe_dev_cleanup() - cleanup link change notification interface
1457 static void fcoe_dev_cleanup(void)
1459 unregister_netdevice_notifier(&fcoe_notifier);
1463 * fcoe_device_notification() - netdev event notification callback
1464 * @notifier: context of the notification
1465 * @event: type of event
1466 * @ptr: fixed array for output parsed ifname
1468 * This function is called by the ethernet driver in case of link change event
1470 * Returns: 0 for success
1472 static int fcoe_device_notification(struct notifier_block *notifier,
1473 ulong event, void *ptr)
1475 struct fc_lport *lp = NULL;
1476 struct net_device *netdev = ptr;
1477 struct fcoe_interface *fcoe;
1478 struct fcoe_dev_stats *stats;
1479 u32 link_possible = 1;
1483 read_lock(&fcoe_hostlist_lock);
1484 list_for_each_entry(fcoe, &fcoe_hostlist, list) {
1485 if (fcoe->netdev == netdev) {
1490 read_unlock(&fcoe_hostlist_lock);
1498 case NETDEV_GOING_DOWN:
1504 case NETDEV_CHANGEMTU:
1505 mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
1506 sizeof(struct fcoe_crc_eof));
1507 if (mfs >= FC_MIN_MAX_FRAME)
1508 fc_set_mfs(lp, mfs);
1510 case NETDEV_REGISTER:
1513 FCOE_NETDEV_DBG(netdev, "Unknown event %ld "
1514 "from netdev netlink\n", event);
1516 if (link_possible && !fcoe_link_ok(lp))
1517 fcoe_ctlr_link_up(&fcoe->ctlr);
1518 else if (fcoe_ctlr_link_down(&fcoe->ctlr)) {
1519 stats = fc_lport_get_stats(lp);
1520 stats->LinkFailureCount++;
1521 fcoe_clean_pending_queue(lp);
1528 * fcoe_if_to_netdev() - parse a name buffer to get netdev
1529 * @buffer: incoming buffer to be copied
1531 * Returns: NULL or ptr to net_device
1533 static struct net_device *fcoe_if_to_netdev(const char *buffer)
1536 char ifname[IFNAMSIZ + 2];
1539 strlcpy(ifname, buffer, IFNAMSIZ);
1540 cp = ifname + strlen(ifname);
1541 while (--cp >= ifname && *cp == '\n')
1543 return dev_get_by_name(&init_net, ifname);
1549 * fcoe_netdev_to_module_owner() - finds out the driver module of the netdev
1550 * @netdev: the target netdev
1552 * Returns: ptr to the struct module, NULL for failure
1554 static struct module *
1555 fcoe_netdev_to_module_owner(const struct net_device *netdev)
1562 dev = netdev->dev.parent;
1569 return dev->driver->owner;
1573 * fcoe_ethdrv_get() - Hold the Ethernet driver
1574 * @netdev: the target netdev
1576 * Holds the Ethernet driver module by try_module_get() for
1577 * the corresponding netdev.
1579 * Returns: 0 for success
1581 static int fcoe_ethdrv_get(const struct net_device *netdev)
1583 struct module *owner;
1585 owner = fcoe_netdev_to_module_owner(netdev);
1587 FCOE_NETDEV_DBG(netdev, "Hold driver module %s\n",
1588 module_name(owner));
1589 return try_module_get(owner);
1595 * fcoe_ethdrv_put() - Release the Ethernet driver
1596 * @netdev: the target netdev
1598 * Releases the Ethernet driver module by module_put for
1599 * the corresponding netdev.
1601 * Returns: 0 for success
1603 static int fcoe_ethdrv_put(const struct net_device *netdev)
1605 struct module *owner;
1607 owner = fcoe_netdev_to_module_owner(netdev);
1609 FCOE_NETDEV_DBG(netdev, "Release driver module %s\n",
1610 module_name(owner));
1618 * fcoe_destroy() - handles the destroy from sysfs
1619 * @buffer: expected to be an eth if name
1620 * @kp: associated kernel param
1622 * Returns: 0 for success
1624 static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
1626 struct net_device *netdev;
1627 struct fc_lport *lport;
1630 netdev = fcoe_if_to_netdev(buffer);
1635 /* look for existing lport */
1636 lport = fcoe_hostlist_lookup(netdev);
1641 fcoe_if_destroy(lport);
1642 fcoe_ethdrv_put(netdev);
1651 * fcoe_create() - Handles the create call from sysfs
1652 * @buffer: expected to be an eth if name
1653 * @kp: associated kernel param
1655 * Returns: 0 for success
1657 static int fcoe_create(const char *buffer, struct kernel_param *kp)
1660 struct fc_lport *lport;
1661 struct net_device *netdev;
1663 netdev = fcoe_if_to_netdev(buffer);
1668 /* look for existing lport */
1669 if (fcoe_hostlist_lookup(netdev)) {
1673 fcoe_ethdrv_get(netdev);
1675 lport = fcoe_if_create(netdev, &netdev->dev);
1676 if (IS_ERR(lport)) {
1677 printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
1679 fcoe_ethdrv_put(netdev);
1690 module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR);
1691 __MODULE_PARM_TYPE(create, "string");
1692 MODULE_PARM_DESC(create, "Create fcoe fcoe using net device passed in.");
1693 module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR);
1694 __MODULE_PARM_TYPE(destroy, "string");
1695 MODULE_PARM_DESC(destroy, "Destroy fcoe fcoe");
1698 * fcoe_link_ok() - Check if link is ok for the fc_lport
1699 * @lp: ptr to the fc_lport
1701 * Any permanently-disqualifying conditions have been previously checked.
1702 * This also updates the speed setting, which may change with link for 100/1000.
1704 * This function should probably be checking for PAUSE support at some point
1705 * in the future. Currently Per-priority-pause is not determinable using
1706 * ethtool, so we shouldn't be restrictive until that problem is resolved.
1708 * Returns: 0 if link is OK for use by FCoE.
1711 int fcoe_link_ok(struct fc_lport *lp)
1713 struct fcoe_port *port = lport_priv(lp);
1714 struct net_device *dev = port->fcoe->netdev;
1715 struct ethtool_cmd ecmd = { ETHTOOL_GSET };
1717 if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
1718 (!dev_ethtool_get_settings(dev, &ecmd))) {
1719 lp->link_supported_speeds &=
1720 ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
1721 if (ecmd.supported & (SUPPORTED_1000baseT_Half |
1722 SUPPORTED_1000baseT_Full))
1723 lp->link_supported_speeds |= FC_PORTSPEED_1GBIT;
1724 if (ecmd.supported & SUPPORTED_10000baseT_Full)
1725 lp->link_supported_speeds |=
1726 FC_PORTSPEED_10GBIT;
1727 if (ecmd.speed == SPEED_1000)
1728 lp->link_speed = FC_PORTSPEED_1GBIT;
1729 if (ecmd.speed == SPEED_10000)
1730 lp->link_speed = FC_PORTSPEED_10GBIT;
1738 * fcoe_percpu_clean() - Clear the pending skbs for an lport
1741 void fcoe_percpu_clean(struct fc_lport *lp)
1743 struct fcoe_percpu_s *pp;
1744 struct fcoe_rcv_info *fr;
1745 struct sk_buff_head *list;
1746 struct sk_buff *skb, *next;
1747 struct sk_buff *head;
1750 for_each_possible_cpu(cpu) {
1751 pp = &per_cpu(fcoe_percpu, cpu);
1752 spin_lock_bh(&pp->fcoe_rx_list.lock);
1753 list = &pp->fcoe_rx_list;
1755 for (skb = head; skb != (struct sk_buff *)list;
1758 fr = fcoe_dev_from_skb(skb);
1759 if (fr->fr_dev == lp) {
1760 __skb_unlink(skb, list);
1764 spin_unlock_bh(&pp->fcoe_rx_list.lock);
1769 * fcoe_clean_pending_queue() - Dequeue a skb and free it
1770 * @lp: the corresponding fc_lport
1774 void fcoe_clean_pending_queue(struct fc_lport *lp)
1776 struct fcoe_port *port = lport_priv(lp);
1777 struct sk_buff *skb;
1779 spin_lock_bh(&port->fcoe_pending_queue.lock);
1780 while ((skb = __skb_dequeue(&port->fcoe_pending_queue)) != NULL) {
1781 spin_unlock_bh(&port->fcoe_pending_queue.lock);
1783 spin_lock_bh(&port->fcoe_pending_queue.lock);
1785 spin_unlock_bh(&port->fcoe_pending_queue.lock);
1789 * fcoe_reset() - Resets the fcoe
1790 * @shost: shost the reset is from
1794 int fcoe_reset(struct Scsi_Host *shost)
1796 struct fc_lport *lport = shost_priv(shost);
1797 fc_lport_reset(lport);
1802 * fcoe_hostlist_lookup_port() - find the corresponding lport by a given device
1803 * @dev: this is currently ptr to net_device
1805 * Called with fcoe_hostlist_lock held.
1807 * Returns: NULL or the located fcoe_port
1809 static struct fcoe_interface *
1810 fcoe_hostlist_lookup_port(const struct net_device *dev)
1812 struct fcoe_interface *fcoe;
1814 list_for_each_entry(fcoe, &fcoe_hostlist, list) {
1815 if (fcoe->netdev == dev)
1822 * fcoe_hostlist_lookup() - Find the corresponding lport by netdev
1823 * @netdev: ptr to net_device
1825 * Returns: 0 for success
1827 struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
1829 struct fcoe_interface *fcoe;
1831 read_lock(&fcoe_hostlist_lock);
1832 fcoe = fcoe_hostlist_lookup_port(netdev);
1833 read_unlock(&fcoe_hostlist_lock);
1835 return (fcoe) ? fcoe->ctlr.lp : NULL;
1839 * fcoe_hostlist_add() - Add a lport to lports list
1840 * @lp: ptr to the fc_lport to be added
1842 * Called with write fcoe_hostlist_lock held.
1844 * Returns: 0 for success
1846 int fcoe_hostlist_add(const struct fc_lport *lport)
1848 struct fcoe_interface *fcoe;
1849 struct fcoe_port *port;
1851 fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
1853 port = lport_priv(lport);
1855 list_add_tail(&fcoe->list, &fcoe_hostlist);
1861 * fcoe_hostlist_remove() - remove a lport from lports list
1862 * @lp: ptr to the fc_lport to be removed
1864 * Returns: 0 for success
1866 int fcoe_hostlist_remove(const struct fc_lport *lport)
1868 struct fcoe_interface *fcoe;
1870 write_lock_bh(&fcoe_hostlist_lock);
1871 fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
1873 list_del(&fcoe->list);
1874 write_unlock_bh(&fcoe_hostlist_lock);
1880 * fcoe_init() - fcoe module loading initialization
1882 * Returns 0 on success, negative on failure
1884 static int __init fcoe_init(void)
1888 struct fcoe_percpu_s *p;
1890 for_each_possible_cpu(cpu) {
1891 p = &per_cpu(fcoe_percpu, cpu);
1892 skb_queue_head_init(&p->fcoe_rx_list);
1895 for_each_online_cpu(cpu)
1896 fcoe_percpu_thread_create(cpu);
1898 /* Initialize per CPU interrupt thread */
1899 rc = register_hotcpu_notifier(&fcoe_cpu_notifier);
1903 /* Setup link change notification */
1906 rc = fcoe_if_init();
1913 for_each_online_cpu(cpu) {
1914 fcoe_percpu_thread_destroy(cpu);
1919 module_init(fcoe_init);
1922 * fcoe_exit() - fcoe module unloading cleanup
1924 * Returns 0 on success, negative on failure
1926 static void __exit fcoe_exit(void)
1929 struct fcoe_interface *fcoe, *tmp;
1933 /* releases the associated fcoe hosts */
1934 list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list)
1935 fcoe_if_destroy(fcoe->ctlr.lp);
1937 unregister_hotcpu_notifier(&fcoe_cpu_notifier);
1939 for_each_online_cpu(cpu)
1940 fcoe_percpu_thread_destroy(cpu);
1942 /* detach from scsi transport */
1945 module_exit(fcoe_exit);