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 static int debug_fcoe
;
50 MODULE_AUTHOR("Open-FCoE.org");
51 MODULE_DESCRIPTION("FCoE");
52 MODULE_LICENSE("GPL v2");
55 LIST_HEAD(fcoe_hostlist
);
56 DEFINE_RWLOCK(fcoe_hostlist_lock
);
57 DEFINE_TIMER(fcoe_timer
, NULL
, 0, 0);
58 DEFINE_PER_CPU(struct fcoe_percpu_s
, fcoe_percpu
);
60 /* Function Prototypes */
61 static int fcoe_reset(struct Scsi_Host
*shost
);
62 static int fcoe_xmit(struct fc_lport
*, struct fc_frame
*);
63 static int fcoe_rcv(struct sk_buff
*, struct net_device
*,
64 struct packet_type
*, struct net_device
*);
65 static int fcoe_percpu_receive_thread(void *arg
);
66 static void fcoe_clean_pending_queue(struct fc_lport
*lp
);
67 static void fcoe_percpu_clean(struct fc_lport
*lp
);
68 static int fcoe_link_ok(struct fc_lport
*lp
);
70 static struct fc_lport
*fcoe_hostlist_lookup(const struct net_device
*);
71 static int fcoe_hostlist_add(const struct fc_lport
*);
72 static int fcoe_hostlist_remove(const struct fc_lport
*);
74 static int fcoe_check_wait_queue(struct fc_lport
*);
75 static int fcoe_device_notification(struct notifier_block
*, ulong
, void *);
76 static void fcoe_dev_setup(void);
77 static void fcoe_dev_cleanup(void);
79 /* notification function from net device */
80 static struct notifier_block fcoe_notifier
= {
81 .notifier_call
= fcoe_device_notification
,
84 static struct scsi_transport_template
*scsi_transport_fcoe_sw
;
86 struct fc_function_template fcoe_transport_function
= {
87 .show_host_node_name
= 1,
88 .show_host_port_name
= 1,
89 .show_host_supported_classes
= 1,
90 .show_host_supported_fc4s
= 1,
91 .show_host_active_fc4s
= 1,
92 .show_host_maxframe_size
= 1,
94 .show_host_port_id
= 1,
95 .show_host_supported_speeds
= 1,
96 .get_host_speed
= fc_get_host_speed
,
98 .show_host_port_type
= 1,
99 .get_host_port_state
= fc_get_host_port_state
,
100 .show_host_port_state
= 1,
101 .show_host_symbolic_name
= 1,
103 .dd_fcrport_size
= sizeof(struct fc_rport_libfc_priv
),
104 .show_rport_maxframe_size
= 1,
105 .show_rport_supported_classes
= 1,
107 .show_host_fabric_name
= 1,
108 .show_starget_node_name
= 1,
109 .show_starget_port_name
= 1,
110 .show_starget_port_id
= 1,
111 .set_rport_dev_loss_tmo
= fc_set_rport_loss_tmo
,
112 .show_rport_dev_loss_tmo
= 1,
113 .get_fc_host_stats
= fc_get_host_stats
,
114 .issue_fc_host_lip
= fcoe_reset
,
116 .terminate_rport_io
= fc_rport_terminate_io
,
119 static struct scsi_host_template fcoe_shost_template
= {
120 .module
= THIS_MODULE
,
121 .name
= "FCoE Driver",
122 .proc_name
= FCOE_NAME
,
123 .queuecommand
= fc_queuecommand
,
124 .eh_abort_handler
= fc_eh_abort
,
125 .eh_device_reset_handler
= fc_eh_device_reset
,
126 .eh_host_reset_handler
= fc_eh_host_reset
,
127 .slave_alloc
= fc_slave_alloc
,
128 .change_queue_depth
= fc_change_queue_depth
,
129 .change_queue_type
= fc_change_queue_type
,
132 .can_queue
= FCOE_MAX_OUTSTANDING_COMMANDS
,
133 .use_clustering
= ENABLE_CLUSTERING
,
134 .sg_tablesize
= SG_ALL
,
135 .max_sectors
= 0xffff,
139 * fcoe_fip_recv - handle a received FIP frame.
140 * @skb: the receive skb
141 * @dev: associated &net_device
142 * @ptype: the &packet_type structure which was used to register this handler.
143 * @orig_dev: original receive &net_device, in case @dev is a bond.
145 * Returns: 0 for success
147 static int fcoe_fip_recv(struct sk_buff
*skb
, struct net_device
*dev
,
148 struct packet_type
*ptype
,
149 struct net_device
*orig_dev
)
151 struct fcoe_softc
*fc
;
153 fc
= container_of(ptype
, struct fcoe_softc
, fip_packet_type
);
154 fcoe_ctlr_recv(&fc
->ctlr
, skb
);
159 * fcoe_fip_send() - send an Ethernet-encapsulated FIP frame.
160 * @fip: FCoE controller.
163 static void fcoe_fip_send(struct fcoe_ctlr
*fip
, struct sk_buff
*skb
)
165 skb
->dev
= fcoe_from_ctlr(fip
)->real_dev
;
170 * fcoe_update_src_mac() - Update Ethernet MAC filters.
171 * @fip: FCoE controller.
172 * @old: Unicast MAC address to delete if the MAC is non-zero.
173 * @new: Unicast MAC address to add.
175 * Remove any previously-set unicast MAC filter.
176 * Add secondary FCoE MAC address filter for our OUI.
178 static void fcoe_update_src_mac(struct fcoe_ctlr
*fip
, u8
*old
, u8
*new)
180 struct fcoe_softc
*fc
;
182 fc
= fcoe_from_ctlr(fip
);
184 if (!is_zero_ether_addr(old
))
185 dev_unicast_delete(fc
->real_dev
, old
);
186 dev_unicast_add(fc
->real_dev
, new);
191 * fcoe_lport_config() - sets up the fc_lport
192 * @lp: ptr to the fc_lport
194 * Returns: 0 for success
196 static int fcoe_lport_config(struct fc_lport
*lp
)
200 lp
->max_retry_count
= 3;
201 lp
->e_d_tov
= 2 * 1000; /* FC-FS default */
202 lp
->r_a_tov
= 2 * 2 * 1000;
203 lp
->service_params
= (FCP_SPPF_INIT_FCN
| FCP_SPPF_RD_XRDY_DIS
|
204 FCP_SPPF_RETRY
| FCP_SPPF_CONF_COMPL
);
206 fc_lport_init_stats(lp
);
208 /* lport fc_lport related configuration */
211 /* offload related configuration */
222 * fcoe_netdev_cleanup() - clean up netdev configurations
223 * @fc: ptr to the fcoe_softc
225 void fcoe_netdev_cleanup(struct fcoe_softc
*fc
)
227 u8 flogi_maddr
[ETH_ALEN
];
229 /* Don't listen for Ethernet packets anymore */
230 dev_remove_pack(&fc
->fcoe_packet_type
);
231 dev_remove_pack(&fc
->fip_packet_type
);
233 /* Delete secondary MAC addresses */
235 memcpy(flogi_maddr
, (u8
[6]) FC_FCOE_FLOGI_MAC
, ETH_ALEN
);
236 dev_unicast_delete(fc
->real_dev
, flogi_maddr
);
237 if (!is_zero_ether_addr(fc
->ctlr
.data_src_addr
))
238 dev_unicast_delete(fc
->real_dev
, fc
->ctlr
.data_src_addr
);
240 dev_unicast_delete(fc
->real_dev
, fc
->ctlr
.ctl_src_addr
);
241 dev_mc_delete(fc
->real_dev
, FIP_ALL_ENODE_MACS
, ETH_ALEN
, 0);
246 * fcoe_netdev_config() - Set up netdev for SW FCoE
247 * @lp : ptr to the fc_lport
248 * @netdev : ptr to the associated netdevice struct
250 * Must be called after fcoe_lport_config() as it will use lport mutex
252 * Returns : 0 for success
254 static int fcoe_netdev_config(struct fc_lport
*lp
, struct net_device
*netdev
)
258 struct fcoe_softc
*fc
;
259 u8 flogi_maddr
[ETH_ALEN
];
260 struct netdev_hw_addr
*ha
;
262 /* Setup lport private data to point to fcoe softc */
265 fc
->real_dev
= netdev
;
266 fc
->phys_dev
= netdev
;
268 /* Require support for get_pauseparam ethtool op. */
269 if (netdev
->priv_flags
& IFF_802_1Q_VLAN
)
270 fc
->phys_dev
= vlan_dev_real_dev(netdev
);
272 /* Do not support for bonding device */
273 if ((fc
->real_dev
->priv_flags
& IFF_MASTER_ALB
) ||
274 (fc
->real_dev
->priv_flags
& IFF_SLAVE_INACTIVE
) ||
275 (fc
->real_dev
->priv_flags
& IFF_MASTER_8023AD
)) {
280 * Determine max frame size based on underlying device and optional
281 * user-configured limit. If the MFS is too low, fcoe_link_ok()
282 * will return 0, so do this first.
284 mfs
= fc
->real_dev
->mtu
- (sizeof(struct fcoe_hdr
) +
285 sizeof(struct fcoe_crc_eof
));
286 if (fc_set_mfs(lp
, mfs
))
289 /* offload features support */
290 if (fc
->real_dev
->features
& NETIF_F_SG
)
293 #ifdef NETIF_F_FCOE_CRC
294 if (netdev
->features
& NETIF_F_FCOE_CRC
) {
296 printk(KERN_DEBUG
"fcoe:%s supports FCCRC offload\n",
301 if (netdev
->features
& NETIF_F_FSO
) {
303 lp
->lso_max
= netdev
->gso_max_size
;
304 printk(KERN_DEBUG
"fcoe:%s supports LSO for max len 0x%x\n",
305 netdev
->name
, lp
->lso_max
);
308 if (netdev
->fcoe_ddp_xid
) {
310 lp
->lro_xid
= netdev
->fcoe_ddp_xid
;
311 printk(KERN_DEBUG
"fcoe:%s supports LRO for max xid 0x%x\n",
312 netdev
->name
, lp
->lro_xid
);
314 skb_queue_head_init(&fc
->fcoe_pending_queue
);
315 fc
->fcoe_pending_queue_active
= 0;
317 /* look for SAN MAC address, if multiple SAN MACs exist, only
318 * use the first one for SPMA */
320 for_each_dev_addr(netdev
, ha
) {
321 if ((ha
->type
== NETDEV_HW_ADDR_T_SAN
) &&
322 (is_valid_ether_addr(fc
->ctlr
.ctl_src_addr
))) {
323 memcpy(fc
->ctlr
.ctl_src_addr
, ha
->addr
, ETH_ALEN
);
330 /* setup Source Mac Address */
332 memcpy(fc
->ctlr
.ctl_src_addr
, fc
->real_dev
->dev_addr
,
333 fc
->real_dev
->addr_len
);
335 wwnn
= fcoe_wwn_from_mac(fc
->real_dev
->dev_addr
, 1, 0);
336 fc_set_wwnn(lp
, wwnn
);
337 /* XXX - 3rd arg needs to be vlan id */
338 wwpn
= fcoe_wwn_from_mac(fc
->real_dev
->dev_addr
, 2, 0);
339 fc_set_wwpn(lp
, wwpn
);
342 * Add FCoE MAC address as second unicast MAC address
343 * or enter promiscuous mode if not capable of listening
344 * for multiple unicast MACs.
347 memcpy(flogi_maddr
, (u8
[6]) FC_FCOE_FLOGI_MAC
, ETH_ALEN
);
348 dev_unicast_add(fc
->real_dev
, flogi_maddr
);
350 dev_unicast_add(fc
->real_dev
, fc
->ctlr
.ctl_src_addr
);
351 dev_mc_add(fc
->real_dev
, FIP_ALL_ENODE_MACS
, ETH_ALEN
, 0);
355 * setup the receive function from ethernet driver
356 * on the ethertype for the given device
358 fc
->fcoe_packet_type
.func
= fcoe_rcv
;
359 fc
->fcoe_packet_type
.type
= __constant_htons(ETH_P_FCOE
);
360 fc
->fcoe_packet_type
.dev
= fc
->real_dev
;
361 dev_add_pack(&fc
->fcoe_packet_type
);
363 fc
->fip_packet_type
.func
= fcoe_fip_recv
;
364 fc
->fip_packet_type
.type
= htons(ETH_P_FIP
);
365 fc
->fip_packet_type
.dev
= fc
->real_dev
;
366 dev_add_pack(&fc
->fip_packet_type
);
372 * fcoe_shost_config() - Sets up fc_lport->host
373 * @lp : ptr to the fc_lport
374 * @shost : ptr to the associated scsi host
375 * @dev : device associated to scsi host
377 * Must be called after fcoe_lport_config() and fcoe_netdev_config()
379 * Returns : 0 for success
381 static int fcoe_shost_config(struct fc_lport
*lp
, struct Scsi_Host
*shost
,
386 /* lport scsi host config */
389 lp
->host
->max_lun
= FCOE_MAX_LUN
;
390 lp
->host
->max_id
= FCOE_MAX_FCP_TARGET
;
391 lp
->host
->max_channel
= 0;
392 lp
->host
->transportt
= scsi_transport_fcoe_sw
;
394 /* add the new host to the SCSI-ml */
395 rc
= scsi_add_host(lp
->host
, dev
);
397 FC_DBG("fcoe_shost_config:error on scsi_add_host\n");
400 sprintf(fc_host_symbolic_name(lp
->host
), "%s v%s over %s",
401 FCOE_NAME
, FCOE_VERSION
,
402 fcoe_netdev(lp
)->name
);
408 * fcoe_em_config() - allocates em for this lport
409 * @lp: the port that em is to allocated for
411 * Returns : 0 on success
413 static inline int fcoe_em_config(struct fc_lport
*lp
)
417 lp
->emp
= fc_exch_mgr_alloc(lp
, FC_CLASS_3
,
418 FCOE_MIN_XID
, FCOE_MAX_XID
);
426 * fcoe_if_destroy() - FCoE software HBA tear-down function
427 * @netdev: ptr to the associated net_device
429 * Returns: 0 if link is OK for use by FCoE.
431 static int fcoe_if_destroy(struct net_device
*netdev
)
433 struct fc_lport
*lp
= NULL
;
434 struct fcoe_softc
*fc
;
438 printk(KERN_DEBUG
"fcoe_if_destroy:interface on %s\n",
441 lp
= fcoe_hostlist_lookup(netdev
);
447 /* Logout of the fabric */
448 fc_fabric_logoff(lp
);
450 /* Remove the instance from fcoe's list */
451 fcoe_hostlist_remove(lp
);
453 /* clean up netdev configurations */
454 fcoe_netdev_cleanup(fc
);
456 /* tear-down the FCoE controller */
457 fcoe_ctlr_destroy(&fc
->ctlr
);
459 /* Cleanup the fc_lport */
460 fc_lport_destroy(lp
);
463 /* Detach from the scsi-ml */
464 fc_remove_host(lp
->host
);
465 scsi_remove_host(lp
->host
);
467 /* There are no more rports or I/O, free the EM */
469 fc_exch_mgr_free(lp
->emp
);
471 /* Free the per-CPU receive threads */
472 fcoe_percpu_clean(lp
);
474 /* Free existing skbs */
475 fcoe_clean_pending_queue(lp
);
477 /* Free memory used by statistical counters */
478 fc_lport_free_stats(lp
);
480 /* Release the net_device and Scsi_Host */
481 dev_put(fc
->real_dev
);
482 scsi_host_put(lp
->host
);
488 * fcoe_ddp_setup - calls LLD's ddp_setup through net_device
489 * @lp: the corresponding fc_lport
490 * @xid: the exchange id for this ddp transfer
491 * @sgl: the scatterlist describing this transfer
492 * @sgc: number of sg items
496 static int fcoe_ddp_setup(struct fc_lport
*lp
, u16 xid
,
497 struct scatterlist
*sgl
, unsigned int sgc
)
499 struct net_device
*n
= fcoe_netdev(lp
);
501 if (n
->netdev_ops
&& n
->netdev_ops
->ndo_fcoe_ddp_setup
)
502 return n
->netdev_ops
->ndo_fcoe_ddp_setup(n
, xid
, sgl
, sgc
);
508 * fcoe_ddp_done - calls LLD's ddp_done through net_device
509 * @lp: the corresponding fc_lport
510 * @xid: the exchange id for this ddp transfer
512 * Returns : the length of data that have been completed by ddp
514 static int fcoe_ddp_done(struct fc_lport
*lp
, u16 xid
)
516 struct net_device
*n
= fcoe_netdev(lp
);
518 if (n
->netdev_ops
&& n
->netdev_ops
->ndo_fcoe_ddp_done
)
519 return n
->netdev_ops
->ndo_fcoe_ddp_done(n
, xid
);
523 static struct libfc_function_template fcoe_libfc_fcn_templ
= {
524 .frame_send
= fcoe_xmit
,
525 .ddp_setup
= fcoe_ddp_setup
,
526 .ddp_done
= fcoe_ddp_done
,
530 * fcoe_if_create() - this function creates the fcoe interface
531 * @netdev: pointer the associated netdevice
533 * Creates fc_lport struct and scsi_host for lport, configures lport
534 * and starts fabric login.
536 * Returns : 0 on success
538 static int fcoe_if_create(struct net_device
*netdev
)
541 struct fc_lport
*lp
= NULL
;
542 struct fcoe_softc
*fc
;
543 struct Scsi_Host
*shost
;
547 printk(KERN_DEBUG
"fcoe_if_create:interface on %s\n",
550 lp
= fcoe_hostlist_lookup(netdev
);
554 shost
= libfc_host_alloc(&fcoe_shost_template
,
555 sizeof(struct fcoe_softc
));
557 FC_DBG("Could not allocate host structure\n");
560 lp
= shost_priv(shost
);
563 /* configure fc_lport, e.g., em */
564 rc
= fcoe_lport_config(lp
);
566 FC_DBG("Could not configure lport\n");
573 fcoe_ctlr_init(&fc
->ctlr
);
574 fc
->ctlr
.send
= fcoe_fip_send
;
575 fc
->ctlr
.update_mac
= fcoe_update_src_mac
;
577 /* configure lport network properties */
578 rc
= fcoe_netdev_config(lp
, netdev
);
580 FC_DBG("Could not configure netdev for the interface\n");
581 goto out_netdev_cleanup
;
584 /* configure lport scsi host properties */
585 rc
= fcoe_shost_config(lp
, shost
, &netdev
->dev
);
587 FC_DBG("Could not configure shost for lport\n");
588 goto out_netdev_cleanup
;
591 /* lport exch manager allocation */
592 rc
= fcoe_em_config(lp
);
594 FC_DBG("Could not configure em for lport\n");
595 goto out_netdev_cleanup
;
598 /* Initialize the library */
599 rc
= fcoe_libfc_config(lp
, &fcoe_libfc_fcn_templ
);
601 FC_DBG("Could not configure libfc for lport!\n");
605 /* add to lports list */
606 fcoe_hostlist_add(lp
);
608 lp
->boot_time
= jiffies
;
612 if (!fcoe_link_ok(lp
))
613 fcoe_ctlr_link_up(&fc
->ctlr
);
620 fc_exch_mgr_free(lp
->emp
); /* Free the EM */
622 fcoe_netdev_cleanup(fc
);
624 scsi_host_put(lp
->host
);
629 * fcoe_if_init() - attach to scsi transport
631 * Returns : 0 on success
633 static int __init
fcoe_if_init(void)
635 /* attach to scsi transport */
636 scsi_transport_fcoe_sw
=
637 fc_attach_transport(&fcoe_transport_function
);
639 if (!scsi_transport_fcoe_sw
) {
640 printk(KERN_ERR
"fcoe_init:fc_attach_transport() failed\n");
648 * fcoe_if_exit() - detach from scsi transport
650 * Returns : 0 on success
652 int __exit
fcoe_if_exit(void)
654 fc_release_transport(scsi_transport_fcoe_sw
);
659 * fcoe_percpu_thread_create() - Create a receive thread for an online cpu
660 * @cpu: cpu index for the online cpu
662 static void fcoe_percpu_thread_create(unsigned int cpu
)
664 struct fcoe_percpu_s
*p
;
665 struct task_struct
*thread
;
667 p
= &per_cpu(fcoe_percpu
, cpu
);
669 thread
= kthread_create(fcoe_percpu_receive_thread
,
670 (void *)p
, "fcoethread/%d", cpu
);
672 if (likely(!IS_ERR(p
->thread
))) {
673 kthread_bind(thread
, cpu
);
674 wake_up_process(thread
);
676 spin_lock_bh(&p
->fcoe_rx_list
.lock
);
678 spin_unlock_bh(&p
->fcoe_rx_list
.lock
);
683 * fcoe_percpu_thread_destroy() - removes the rx thread for the given cpu
684 * @cpu: cpu index the rx thread is to be removed
686 * Destroys a per-CPU Rx thread. Any pending skbs are moved to the
687 * current CPU's Rx thread. If the thread being destroyed is bound to
688 * the CPU processing this context the skbs will be freed.
690 static void fcoe_percpu_thread_destroy(unsigned int cpu
)
692 struct fcoe_percpu_s
*p
;
693 struct task_struct
*thread
;
694 struct page
*crc_eof
;
697 struct fcoe_percpu_s
*p0
;
698 unsigned targ_cpu
= smp_processor_id();
699 #endif /* CONFIG_SMP */
701 printk(KERN_DEBUG
"fcoe: Destroying receive thread for CPU %d\n", cpu
);
703 /* Prevent any new skbs from being queued for this CPU. */
704 p
= &per_cpu(fcoe_percpu
, cpu
);
705 spin_lock_bh(&p
->fcoe_rx_list
.lock
);
708 crc_eof
= p
->crc_eof_page
;
709 p
->crc_eof_page
= NULL
;
710 p
->crc_eof_offset
= 0;
711 spin_unlock_bh(&p
->fcoe_rx_list
.lock
);
715 * Don't bother moving the skb's if this context is running
716 * on the same CPU that is having its thread destroyed. This
717 * can easily happen when the module is removed.
719 if (cpu
!= targ_cpu
) {
720 p0
= &per_cpu(fcoe_percpu
, targ_cpu
);
721 spin_lock_bh(&p0
->fcoe_rx_list
.lock
);
723 FC_DBG("Moving frames from CPU %d to CPU %d\n",
726 while ((skb
= __skb_dequeue(&p
->fcoe_rx_list
)) != NULL
)
727 __skb_queue_tail(&p0
->fcoe_rx_list
, skb
);
728 spin_unlock_bh(&p0
->fcoe_rx_list
.lock
);
731 * The targeted CPU is not initialized and cannot accept
732 * new skbs. Unlock the targeted CPU and drop the skbs
733 * on the CPU that is going offline.
735 while ((skb
= __skb_dequeue(&p
->fcoe_rx_list
)) != NULL
)
737 spin_unlock_bh(&p0
->fcoe_rx_list
.lock
);
741 * This scenario occurs when the module is being removed
742 * and all threads are being destroyed. skbs will continue
743 * to be shifted from the CPU thread that is being removed
744 * to the CPU thread associated with the CPU that is processing
745 * the module removal. Once there is only one CPU Rx thread it
746 * will reach this case and we will drop all skbs and later
749 spin_lock_bh(&p
->fcoe_rx_list
.lock
);
750 while ((skb
= __skb_dequeue(&p
->fcoe_rx_list
)) != NULL
)
752 spin_unlock_bh(&p
->fcoe_rx_list
.lock
);
756 * This a non-SMP scenario where the singular Rx thread is
757 * being removed. Free all skbs and stop the thread.
759 spin_lock_bh(&p
->fcoe_rx_list
.lock
);
760 while ((skb
= __skb_dequeue(&p
->fcoe_rx_list
)) != NULL
)
762 spin_unlock_bh(&p
->fcoe_rx_list
.lock
);
766 kthread_stop(thread
);
773 * fcoe_cpu_callback() - fcoe cpu hotplug event callback
774 * @nfb: callback data block
775 * @action: event triggering the callback
776 * @hcpu: index for the cpu of this event
778 * This creates or destroys per cpu data for fcoe
780 * Returns NOTIFY_OK always.
782 static int fcoe_cpu_callback(struct notifier_block
*nfb
,
783 unsigned long action
, void *hcpu
)
785 unsigned cpu
= (unsigned long)hcpu
;
789 case CPU_ONLINE_FROZEN
:
790 FC_DBG("CPU %x online: Create Rx thread\n", cpu
);
791 fcoe_percpu_thread_create(cpu
);
794 case CPU_DEAD_FROZEN
:
795 FC_DBG("CPU %x offline: Remove Rx thread\n", cpu
);
796 fcoe_percpu_thread_destroy(cpu
);
804 static struct notifier_block fcoe_cpu_notifier
= {
805 .notifier_call
= fcoe_cpu_callback
,
809 * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ
810 * @skb: the receive skb
811 * @dev: associated net device
813 * @olddev: last device
815 * this function will receive the packet and build fc frame and pass it up
817 * Returns: 0 for success
819 int fcoe_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
820 struct packet_type
*ptype
, struct net_device
*olddev
)
823 struct fcoe_rcv_info
*fr
;
824 struct fcoe_softc
*fc
;
825 struct fc_frame_header
*fh
;
826 struct fcoe_percpu_s
*fps
;
828 unsigned int cpu
= 0;
830 fc
= container_of(ptype
, struct fcoe_softc
, fcoe_packet_type
);
832 if (unlikely(lp
== NULL
)) {
833 FC_DBG("cannot find hba structure");
839 if (unlikely(debug_fcoe
)) {
840 FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p "
841 "end:%p sum:%d dev:%s", skb
->len
, skb
->data_len
,
842 skb
->head
, skb
->data
, skb_tail_pointer(skb
),
843 skb_end_pointer(skb
), skb
->csum
,
844 skb
->dev
? skb
->dev
->name
: "<NULL>");
848 /* check for FCOE packet type */
849 if (unlikely(eth_hdr(skb
)->h_proto
!= htons(ETH_P_FCOE
))) {
850 FC_DBG("wrong FC type frame");
855 * Check for minimum frame length, and make sure required FCoE
856 * and FC headers are pulled into the linear data area.
858 if (unlikely((skb
->len
< FCOE_MIN_FRAME
) ||
859 !pskb_may_pull(skb
, FCOE_HEADER_LEN
)))
862 skb_set_transport_header(skb
, sizeof(struct fcoe_hdr
));
863 fh
= (struct fc_frame_header
*) skb_transport_header(skb
);
865 oxid
= ntohs(fh
->fh_ox_id
);
867 fr
= fcoe_dev_from_skb(skb
);
873 * The incoming frame exchange id(oxid) is ANDed with num of online
874 * cpu bits to get cpu and then this cpu is used for selecting
875 * a per cpu kernel thread from fcoe_percpu.
877 cpu
= oxid
& (num_online_cpus() - 1);
880 fps
= &per_cpu(fcoe_percpu
, cpu
);
881 spin_lock_bh(&fps
->fcoe_rx_list
.lock
);
882 if (unlikely(!fps
->thread
)) {
884 * The targeted CPU is not ready, let's target
885 * the first CPU now. For non-SMP systems this
886 * will check the same CPU twice.
888 FC_DBG("CPU is online, but no receive thread ready "
889 "for incoming skb- using first online CPU.\n");
891 spin_unlock_bh(&fps
->fcoe_rx_list
.lock
);
892 cpu
= first_cpu(cpu_online_map
);
893 fps
= &per_cpu(fcoe_percpu
, cpu
);
894 spin_lock_bh(&fps
->fcoe_rx_list
.lock
);
896 spin_unlock_bh(&fps
->fcoe_rx_list
.lock
);
902 * We now have a valid CPU that we're targeting for
903 * this skb. We also have this receive thread locked,
904 * so we're free to queue skbs into it's queue.
906 __skb_queue_tail(&fps
->fcoe_rx_list
, skb
);
907 if (fps
->fcoe_rx_list
.qlen
== 1)
908 wake_up_process(fps
->thread
);
910 spin_unlock_bh(&fps
->fcoe_rx_list
.lock
);
914 fc_lport_get_stats(lp
)->ErrorFrames
++;
922 * fcoe_start_io() - pass to netdev to start xmit for fcoe
923 * @skb: the skb to be xmitted
925 * Returns: 0 for success
927 static inline int fcoe_start_io(struct sk_buff
*skb
)
932 rc
= dev_queue_xmit(skb
);
940 * fcoe_get_paged_crc_eof() - in case we need to alloc a page for crc_eof
941 * @skb: the skb to be xmitted
944 * Returns: 0 for success
946 static int fcoe_get_paged_crc_eof(struct sk_buff
*skb
, int tlen
)
948 struct fcoe_percpu_s
*fps
;
951 fps
= &get_cpu_var(fcoe_percpu
);
952 page
= fps
->crc_eof_page
;
954 page
= alloc_page(GFP_ATOMIC
);
956 put_cpu_var(fcoe_percpu
);
959 fps
->crc_eof_page
= page
;
960 fps
->crc_eof_offset
= 0;
964 skb_fill_page_desc(skb
, skb_shinfo(skb
)->nr_frags
, page
,
965 fps
->crc_eof_offset
, tlen
);
967 skb
->data_len
+= tlen
;
968 skb
->truesize
+= tlen
;
969 fps
->crc_eof_offset
+= sizeof(struct fcoe_crc_eof
);
971 if (fps
->crc_eof_offset
>= PAGE_SIZE
) {
972 fps
->crc_eof_page
= NULL
;
973 fps
->crc_eof_offset
= 0;
976 put_cpu_var(fcoe_percpu
);
981 * fcoe_fc_crc() - calculates FC CRC in this fcoe skb
982 * @fp: the fc_frame containing data to be checksummed
984 * This uses crc32() to calculate the crc for fc frame
985 * Return : 32 bit crc
987 u32
fcoe_fc_crc(struct fc_frame
*fp
)
989 struct sk_buff
*skb
= fp_skb(fp
);
990 struct skb_frag_struct
*frag
;
992 unsigned long off
, len
, clen
;
996 crc
= crc32(~0, skb
->data
, skb_headlen(skb
));
998 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
999 frag
= &skb_shinfo(skb
)->frags
[i
];
1000 off
= frag
->page_offset
;
1003 clen
= min(len
, PAGE_SIZE
- (off
& ~PAGE_MASK
));
1004 data
= kmap_atomic(frag
->page
+ (off
>> PAGE_SHIFT
),
1005 KM_SKB_DATA_SOFTIRQ
);
1006 crc
= crc32(crc
, data
+ (off
& ~PAGE_MASK
), clen
);
1007 kunmap_atomic(data
, KM_SKB_DATA_SOFTIRQ
);
1016 * fcoe_xmit() - FCoE frame transmit function
1017 * @lp: the associated local port
1018 * @fp: the fc_frame to be transmitted
1020 * Return : 0 for success
1022 int fcoe_xmit(struct fc_lport
*lp
, struct fc_frame
*fp
)
1027 struct fcoe_crc_eof
*cp
;
1028 struct sk_buff
*skb
;
1029 struct fcoe_dev_stats
*stats
;
1030 struct fc_frame_header
*fh
;
1031 unsigned int hlen
; /* header length implies the version */
1032 unsigned int tlen
; /* trailer length */
1033 unsigned int elen
; /* eth header, may include vlan */
1034 struct fcoe_softc
*fc
;
1036 struct fcoe_hdr
*hp
;
1038 WARN_ON((fr_len(fp
) % sizeof(u32
)) != 0);
1040 fc
= lport_priv(lp
);
1041 fh
= fc_frame_header_get(fp
);
1043 wlen
= skb
->len
/ FCOE_WORD_TO_BYTE
;
1050 if (unlikely(fh
->fh_r_ctl
== FC_RCTL_ELS_REQ
) &&
1051 fcoe_ctlr_els_send(&fc
->ctlr
, skb
))
1057 elen
= (fc
->real_dev
->priv_flags
& IFF_802_1Q_VLAN
) ?
1058 sizeof(struct vlan_ethhdr
) : sizeof(struct ethhdr
);
1059 hlen
= sizeof(struct fcoe_hdr
);
1060 tlen
= sizeof(struct fcoe_crc_eof
);
1061 wlen
= (skb
->len
- tlen
+ sizeof(crc
)) / FCOE_WORD_TO_BYTE
;
1064 if (likely(lp
->crc_offload
)) {
1065 skb
->ip_summed
= CHECKSUM_PARTIAL
;
1066 skb
->csum_start
= skb_headroom(skb
);
1067 skb
->csum_offset
= skb
->len
;
1070 skb
->ip_summed
= CHECKSUM_NONE
;
1071 crc
= fcoe_fc_crc(fp
);
1074 /* copy fc crc and eof to the skb buff */
1075 if (skb_is_nonlinear(skb
)) {
1077 if (fcoe_get_paged_crc_eof(skb
, tlen
)) {
1081 frag
= &skb_shinfo(skb
)->frags
[skb_shinfo(skb
)->nr_frags
- 1];
1082 cp
= kmap_atomic(frag
->page
, KM_SKB_DATA_SOFTIRQ
)
1083 + frag
->page_offset
;
1085 cp
= (struct fcoe_crc_eof
*)skb_put(skb
, tlen
);
1088 memset(cp
, 0, sizeof(*cp
));
1090 cp
->fcoe_crc32
= cpu_to_le32(~crc
);
1092 if (skb_is_nonlinear(skb
)) {
1093 kunmap_atomic(cp
, KM_SKB_DATA_SOFTIRQ
);
1097 /* adjust skb network/transport offsets to match mac/fcoe/fc */
1098 skb_push(skb
, elen
+ hlen
);
1099 skb_reset_mac_header(skb
);
1100 skb_reset_network_header(skb
);
1101 skb
->mac_len
= elen
;
1102 skb
->protocol
= htons(ETH_P_FCOE
);
1103 skb
->dev
= fc
->real_dev
;
1105 /* fill up mac and fcoe headers */
1107 eh
->h_proto
= htons(ETH_P_FCOE
);
1108 if (fc
->ctlr
.map_dest
)
1109 fc_fcoe_set_mac(eh
->h_dest
, fh
->fh_d_id
);
1111 /* insert GW address */
1112 memcpy(eh
->h_dest
, fc
->ctlr
.dest_addr
, ETH_ALEN
);
1114 if (unlikely(fc
->ctlr
.flogi_oxid
!= FC_XID_UNKNOWN
))
1115 memcpy(eh
->h_source
, fc
->ctlr
.ctl_src_addr
, ETH_ALEN
);
1117 memcpy(eh
->h_source
, fc
->ctlr
.data_src_addr
, ETH_ALEN
);
1119 hp
= (struct fcoe_hdr
*)(eh
+ 1);
1120 memset(hp
, 0, sizeof(*hp
));
1122 FC_FCOE_ENCAPS_VER(hp
, FC_FCOE_VER
);
1126 /* fcoe lso, mss is in max_payload which is non-zero for FCP data */
1127 if (lp
->seq_offload
&& fr_max_payload(fp
)) {
1128 skb_shinfo(skb
)->gso_type
= SKB_GSO_FCOE
;
1129 skb_shinfo(skb
)->gso_size
= fr_max_payload(fp
);
1131 skb_shinfo(skb
)->gso_type
= 0;
1132 skb_shinfo(skb
)->gso_size
= 0;
1135 /* update tx stats: regardless if LLD fails */
1136 stats
= fc_lport_get_stats(lp
);
1138 stats
->TxWords
+= wlen
;
1140 /* send down to lld */
1142 if (fc
->fcoe_pending_queue
.qlen
)
1143 rc
= fcoe_check_wait_queue(lp
);
1146 rc
= fcoe_start_io(skb
);
1149 spin_lock_bh(&fc
->fcoe_pending_queue
.lock
);
1150 __skb_queue_tail(&fc
->fcoe_pending_queue
, skb
);
1151 spin_unlock_bh(&fc
->fcoe_pending_queue
.lock
);
1152 if (fc
->fcoe_pending_queue
.qlen
> FCOE_MAX_QUEUE_DEPTH
)
1160 * fcoe_percpu_receive_thread() - recv thread per cpu
1161 * @arg: ptr to the fcoe per cpu struct
1163 * Return: 0 for success
1165 int fcoe_percpu_receive_thread(void *arg
)
1167 struct fcoe_percpu_s
*p
= arg
;
1169 struct fc_lport
*lp
;
1170 struct fcoe_rcv_info
*fr
;
1171 struct fcoe_dev_stats
*stats
;
1172 struct fc_frame_header
*fh
;
1173 struct sk_buff
*skb
;
1174 struct fcoe_crc_eof crc_eof
;
1175 struct fc_frame
*fp
;
1177 struct fcoe_softc
*fc
;
1178 struct fcoe_hdr
*hp
;
1180 set_user_nice(current
, -20);
1182 while (!kthread_should_stop()) {
1184 spin_lock_bh(&p
->fcoe_rx_list
.lock
);
1185 while ((skb
= __skb_dequeue(&p
->fcoe_rx_list
)) == NULL
) {
1186 set_current_state(TASK_INTERRUPTIBLE
);
1187 spin_unlock_bh(&p
->fcoe_rx_list
.lock
);
1189 set_current_state(TASK_RUNNING
);
1190 if (kthread_should_stop())
1192 spin_lock_bh(&p
->fcoe_rx_list
.lock
);
1194 spin_unlock_bh(&p
->fcoe_rx_list
.lock
);
1195 fr
= fcoe_dev_from_skb(skb
);
1197 if (unlikely(lp
== NULL
)) {
1198 FC_DBG("invalid HBA Structure");
1203 if (unlikely(debug_fcoe
)) {
1204 FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p "
1205 "tail:%p end:%p sum:%d dev:%s",
1206 skb
->len
, skb
->data_len
,
1207 skb
->head
, skb
->data
, skb_tail_pointer(skb
),
1208 skb_end_pointer(skb
), skb
->csum
,
1209 skb
->dev
? skb
->dev
->name
: "<NULL>");
1213 * Save source MAC address before discarding header.
1215 fc
= lport_priv(lp
);
1216 if (skb_is_nonlinear(skb
))
1217 skb_linearize(skb
); /* not ideal */
1218 mac
= eth_hdr(skb
)->h_source
;
1221 * Frame length checks and setting up the header pointers
1222 * was done in fcoe_rcv already.
1224 hp
= (struct fcoe_hdr
*) skb_network_header(skb
);
1225 fh
= (struct fc_frame_header
*) skb_transport_header(skb
);
1227 stats
= fc_lport_get_stats(lp
);
1228 if (unlikely(FC_FCOE_DECAPS_VER(hp
) != FC_FCOE_VER
)) {
1229 if (stats
->ErrorFrames
< 5)
1230 printk(KERN_WARNING
"FCoE version "
1231 "mismatch: The frame has "
1232 "version %x, but the "
1233 "initiator supports version "
1234 "%x\n", FC_FCOE_DECAPS_VER(hp
),
1236 stats
->ErrorFrames
++;
1241 skb_pull(skb
, sizeof(struct fcoe_hdr
));
1242 fr_len
= skb
->len
- sizeof(struct fcoe_crc_eof
);
1245 stats
->RxWords
+= fr_len
/ FCOE_WORD_TO_BYTE
;
1247 fp
= (struct fc_frame
*)skb
;
1250 fr_sof(fp
) = hp
->fcoe_sof
;
1252 /* Copy out the CRC and EOF trailer for access */
1253 if (skb_copy_bits(skb
, fr_len
, &crc_eof
, sizeof(crc_eof
))) {
1257 fr_eof(fp
) = crc_eof
.fcoe_eof
;
1258 fr_crc(fp
) = crc_eof
.fcoe_crc32
;
1259 if (pskb_trim(skb
, fr_len
)) {
1265 * We only check CRC if no offload is available and if it is
1266 * it's solicited data, in which case, the FCP layer would
1267 * check it during the copy.
1269 if (lp
->crc_offload
&& skb
->ip_summed
== CHECKSUM_UNNECESSARY
)
1270 fr_flags(fp
) &= ~FCPHF_CRC_UNCHECKED
;
1272 fr_flags(fp
) |= FCPHF_CRC_UNCHECKED
;
1274 fh
= fc_frame_header_get(fp
);
1275 if (fh
->fh_r_ctl
== FC_RCTL_DD_SOL_DATA
&&
1276 fh
->fh_type
== FC_TYPE_FCP
) {
1277 fc_exch_recv(lp
, lp
->emp
, fp
);
1280 if (fr_flags(fp
) & FCPHF_CRC_UNCHECKED
) {
1281 if (le32_to_cpu(fr_crc(fp
)) !=
1282 ~crc32(~0, skb
->data
, fr_len
)) {
1283 if (debug_fcoe
|| stats
->InvalidCRCCount
< 5)
1284 printk(KERN_WARNING
"fcoe: dropping "
1285 "frame with CRC error\n");
1286 stats
->InvalidCRCCount
++;
1287 stats
->ErrorFrames
++;
1291 fr_flags(fp
) &= ~FCPHF_CRC_UNCHECKED
;
1293 if (unlikely(fc
->ctlr
.flogi_oxid
!= FC_XID_UNKNOWN
) &&
1294 fcoe_ctlr_recv_flogi(&fc
->ctlr
, fp
, mac
)) {
1298 fc_exch_recv(lp
, lp
->emp
, fp
);
1304 * fcoe_watchdog() - fcoe timer callback
1307 * This checks the pending queue length for fcoe and set lport qfull
1308 * if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the
1311 * Returns: 0 for success
1313 void fcoe_watchdog(ulong vp
)
1315 struct fcoe_softc
*fc
;
1317 read_lock(&fcoe_hostlist_lock
);
1318 list_for_each_entry(fc
, &fcoe_hostlist
, list
) {
1320 fcoe_check_wait_queue(fc
->ctlr
.lp
);
1322 read_unlock(&fcoe_hostlist_lock
);
1324 fcoe_timer
.expires
= jiffies
+ (1 * HZ
);
1325 add_timer(&fcoe_timer
);
1330 * fcoe_check_wait_queue() - attempt to clear the transmit backlog
1333 * This empties the wait_queue, dequeue the head of the wait_queue queue
1334 * and calls fcoe_start_io() for each packet, if all skb have been
1335 * transmitted, return qlen or -1 if a error occurs, then restore
1336 * wait_queue and try again later.
1338 * The wait_queue is used when the skb transmit fails. skb will go
1339 * in the wait_queue which will be emptied by the timer function or
1340 * by the next skb transmit.
1342 * Returns: 0 for success
1344 static int fcoe_check_wait_queue(struct fc_lport
*lp
)
1346 struct fcoe_softc
*fc
= lport_priv(lp
);
1347 struct sk_buff
*skb
;
1350 spin_lock_bh(&fc
->fcoe_pending_queue
.lock
);
1351 if (fc
->fcoe_pending_queue_active
)
1353 fc
->fcoe_pending_queue_active
= 1;
1355 while (fc
->fcoe_pending_queue
.qlen
) {
1356 /* keep qlen > 0 until fcoe_start_io succeeds */
1357 fc
->fcoe_pending_queue
.qlen
++;
1358 skb
= __skb_dequeue(&fc
->fcoe_pending_queue
);
1360 spin_unlock_bh(&fc
->fcoe_pending_queue
.lock
);
1361 rc
= fcoe_start_io(skb
);
1362 spin_lock_bh(&fc
->fcoe_pending_queue
.lock
);
1365 __skb_queue_head(&fc
->fcoe_pending_queue
, skb
);
1366 /* undo temporary increment above */
1367 fc
->fcoe_pending_queue
.qlen
--;
1370 /* undo temporary increment above */
1371 fc
->fcoe_pending_queue
.qlen
--;
1374 if (fc
->fcoe_pending_queue
.qlen
< FCOE_LOW_QUEUE_DEPTH
)
1376 fc
->fcoe_pending_queue_active
= 0;
1377 rc
= fc
->fcoe_pending_queue
.qlen
;
1379 spin_unlock_bh(&fc
->fcoe_pending_queue
.lock
);
1384 * fcoe_dev_setup() - setup link change notification interface
1386 static void fcoe_dev_setup()
1388 register_netdevice_notifier(&fcoe_notifier
);
1392 * fcoe_dev_setup() - cleanup link change notification interface
1394 static void fcoe_dev_cleanup(void)
1396 unregister_netdevice_notifier(&fcoe_notifier
);
1400 * fcoe_device_notification() - netdev event notification callback
1401 * @notifier: context of the notification
1402 * @event: type of event
1403 * @ptr: fixed array for output parsed ifname
1405 * This function is called by the ethernet driver in case of link change event
1407 * Returns: 0 for success
1409 static int fcoe_device_notification(struct notifier_block
*notifier
,
1410 ulong event
, void *ptr
)
1412 struct fc_lport
*lp
= NULL
;
1413 struct net_device
*real_dev
= ptr
;
1414 struct fcoe_softc
*fc
;
1415 struct fcoe_dev_stats
*stats
;
1416 u32 link_possible
= 1;
1420 read_lock(&fcoe_hostlist_lock
);
1421 list_for_each_entry(fc
, &fcoe_hostlist
, list
) {
1422 if (fc
->real_dev
== real_dev
) {
1427 read_unlock(&fcoe_hostlist_lock
);
1435 case NETDEV_GOING_DOWN
:
1441 case NETDEV_CHANGEMTU
:
1442 mfs
= fc
->real_dev
->mtu
-
1443 (sizeof(struct fcoe_hdr
) +
1444 sizeof(struct fcoe_crc_eof
));
1445 if (mfs
>= FC_MIN_MAX_FRAME
)
1446 fc_set_mfs(lp
, mfs
);
1448 case NETDEV_REGISTER
:
1451 FC_DBG("Unknown event %ld from netdev netlink\n", event
);
1453 if (link_possible
&& !fcoe_link_ok(lp
))
1454 fcoe_ctlr_link_up(&fc
->ctlr
);
1455 else if (fcoe_ctlr_link_down(&fc
->ctlr
)) {
1456 stats
= fc_lport_get_stats(lp
);
1457 stats
->LinkFailureCount
++;
1458 fcoe_clean_pending_queue(lp
);
1465 * fcoe_if_to_netdev() - parse a name buffer to get netdev
1466 * @buffer: incoming buffer to be copied
1468 * Returns: NULL or ptr to net_device
1470 static struct net_device
*fcoe_if_to_netdev(const char *buffer
)
1473 char ifname
[IFNAMSIZ
+ 2];
1476 strlcpy(ifname
, buffer
, IFNAMSIZ
);
1477 cp
= ifname
+ strlen(ifname
);
1478 while (--cp
>= ifname
&& *cp
== '\n')
1480 return dev_get_by_name(&init_net
, ifname
);
1486 * fcoe_netdev_to_module_owner() - finds out the driver module of the netdev
1487 * @netdev: the target netdev
1489 * Returns: ptr to the struct module, NULL for failure
1491 static struct module
*
1492 fcoe_netdev_to_module_owner(const struct net_device
*netdev
)
1499 dev
= netdev
->dev
.parent
;
1506 return dev
->driver
->owner
;
1510 * fcoe_ethdrv_get() - Hold the Ethernet driver
1511 * @netdev: the target netdev
1513 * Holds the Ethernet driver module by try_module_get() for
1514 * the corresponding netdev.
1516 * Returns: 0 for success
1518 static int fcoe_ethdrv_get(const struct net_device
*netdev
)
1520 struct module
*owner
;
1522 owner
= fcoe_netdev_to_module_owner(netdev
);
1524 printk(KERN_DEBUG
"fcoe:hold driver module %s for %s\n",
1525 module_name(owner
), netdev
->name
);
1526 return try_module_get(owner
);
1532 * fcoe_ethdrv_put() - Release the Ethernet driver
1533 * @netdev: the target netdev
1535 * Releases the Ethernet driver module by module_put for
1536 * the corresponding netdev.
1538 * Returns: 0 for success
1540 static int fcoe_ethdrv_put(const struct net_device
*netdev
)
1542 struct module
*owner
;
1544 owner
= fcoe_netdev_to_module_owner(netdev
);
1546 printk(KERN_DEBUG
"fcoe:release driver module %s for %s\n",
1547 module_name(owner
), netdev
->name
);
1555 * fcoe_destroy() - handles the destroy from sysfs
1556 * @buffer: expected to be an eth if name
1557 * @kp: associated kernel param
1559 * Returns: 0 for success
1561 static int fcoe_destroy(const char *buffer
, struct kernel_param
*kp
)
1564 struct net_device
*netdev
;
1566 netdev
= fcoe_if_to_netdev(buffer
);
1571 /* look for existing lport */
1572 if (!fcoe_hostlist_lookup(netdev
)) {
1576 rc
= fcoe_if_destroy(netdev
);
1578 printk(KERN_ERR
"fcoe: fcoe_if_destroy(%s) failed\n",
1583 fcoe_ethdrv_put(netdev
);
1592 * fcoe_create() - Handles the create call from sysfs
1593 * @buffer: expected to be an eth if name
1594 * @kp: associated kernel param
1596 * Returns: 0 for success
1598 static int fcoe_create(const char *buffer
, struct kernel_param
*kp
)
1601 struct net_device
*netdev
;
1603 netdev
= fcoe_if_to_netdev(buffer
);
1608 /* look for existing lport */
1609 if (fcoe_hostlist_lookup(netdev
)) {
1613 fcoe_ethdrv_get(netdev
);
1615 rc
= fcoe_if_create(netdev
);
1617 printk(KERN_ERR
"fcoe: fcoe_if_create(%s) failed\n",
1619 fcoe_ethdrv_put(netdev
);
1630 module_param_call(create
, fcoe_create
, NULL
, NULL
, S_IWUSR
);
1631 __MODULE_PARM_TYPE(create
, "string");
1632 MODULE_PARM_DESC(create
, "Create fcoe port using net device passed in.");
1633 module_param_call(destroy
, fcoe_destroy
, NULL
, NULL
, S_IWUSR
);
1634 __MODULE_PARM_TYPE(destroy
, "string");
1635 MODULE_PARM_DESC(destroy
, "Destroy fcoe port");
1638 * fcoe_link_ok() - Check if link is ok for the fc_lport
1639 * @lp: ptr to the fc_lport
1641 * Any permanently-disqualifying conditions have been previously checked.
1642 * This also updates the speed setting, which may change with link for 100/1000.
1644 * This function should probably be checking for PAUSE support at some point
1645 * in the future. Currently Per-priority-pause is not determinable using
1646 * ethtool, so we shouldn't be restrictive until that problem is resolved.
1648 * Returns: 0 if link is OK for use by FCoE.
1651 int fcoe_link_ok(struct fc_lport
*lp
)
1653 struct fcoe_softc
*fc
= lport_priv(lp
);
1654 struct net_device
*dev
= fc
->real_dev
;
1655 struct ethtool_cmd ecmd
= { ETHTOOL_GSET
};
1658 if ((dev
->flags
& IFF_UP
) && netif_carrier_ok(dev
)) {
1660 if (dev
->ethtool_ops
->get_settings
) {
1661 dev
->ethtool_ops
->get_settings(dev
, &ecmd
);
1662 lp
->link_supported_speeds
&=
1663 ~(FC_PORTSPEED_1GBIT
| FC_PORTSPEED_10GBIT
);
1664 if (ecmd
.supported
& (SUPPORTED_1000baseT_Half
|
1665 SUPPORTED_1000baseT_Full
))
1666 lp
->link_supported_speeds
|= FC_PORTSPEED_1GBIT
;
1667 if (ecmd
.supported
& SUPPORTED_10000baseT_Full
)
1668 lp
->link_supported_speeds
|=
1669 FC_PORTSPEED_10GBIT
;
1670 if (ecmd
.speed
== SPEED_1000
)
1671 lp
->link_speed
= FC_PORTSPEED_1GBIT
;
1672 if (ecmd
.speed
== SPEED_10000
)
1673 lp
->link_speed
= FC_PORTSPEED_10GBIT
;
1682 * fcoe_percpu_clean() - Clear the pending skbs for an lport
1685 void fcoe_percpu_clean(struct fc_lport
*lp
)
1687 struct fcoe_percpu_s
*pp
;
1688 struct fcoe_rcv_info
*fr
;
1689 struct sk_buff_head
*list
;
1690 struct sk_buff
*skb
, *next
;
1691 struct sk_buff
*head
;
1694 for_each_possible_cpu(cpu
) {
1695 pp
= &per_cpu(fcoe_percpu
, cpu
);
1696 spin_lock_bh(&pp
->fcoe_rx_list
.lock
);
1697 list
= &pp
->fcoe_rx_list
;
1699 for (skb
= head
; skb
!= (struct sk_buff
*)list
;
1702 fr
= fcoe_dev_from_skb(skb
);
1703 if (fr
->fr_dev
== lp
) {
1704 __skb_unlink(skb
, list
);
1708 spin_unlock_bh(&pp
->fcoe_rx_list
.lock
);
1713 * fcoe_clean_pending_queue() - Dequeue a skb and free it
1714 * @lp: the corresponding fc_lport
1718 void fcoe_clean_pending_queue(struct fc_lport
*lp
)
1720 struct fcoe_softc
*fc
= lport_priv(lp
);
1721 struct sk_buff
*skb
;
1723 spin_lock_bh(&fc
->fcoe_pending_queue
.lock
);
1724 while ((skb
= __skb_dequeue(&fc
->fcoe_pending_queue
)) != NULL
) {
1725 spin_unlock_bh(&fc
->fcoe_pending_queue
.lock
);
1727 spin_lock_bh(&fc
->fcoe_pending_queue
.lock
);
1729 spin_unlock_bh(&fc
->fcoe_pending_queue
.lock
);
1733 * fcoe_reset() - Resets the fcoe
1734 * @shost: shost the reset is from
1738 int fcoe_reset(struct Scsi_Host
*shost
)
1740 struct fc_lport
*lport
= shost_priv(shost
);
1741 fc_lport_reset(lport
);
1746 * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device
1747 * @dev: this is currently ptr to net_device
1749 * Returns: NULL or the located fcoe_softc
1751 static struct fcoe_softc
*
1752 fcoe_hostlist_lookup_softc(const struct net_device
*dev
)
1754 struct fcoe_softc
*fc
;
1756 read_lock(&fcoe_hostlist_lock
);
1757 list_for_each_entry(fc
, &fcoe_hostlist
, list
) {
1758 if (fc
->real_dev
== dev
) {
1759 read_unlock(&fcoe_hostlist_lock
);
1763 read_unlock(&fcoe_hostlist_lock
);
1768 * fcoe_hostlist_lookup() - Find the corresponding lport by netdev
1769 * @netdev: ptr to net_device
1771 * Returns: 0 for success
1773 struct fc_lport
*fcoe_hostlist_lookup(const struct net_device
*netdev
)
1775 struct fcoe_softc
*fc
;
1777 fc
= fcoe_hostlist_lookup_softc(netdev
);
1779 return (fc
) ? fc
->ctlr
.lp
: NULL
;
1783 * fcoe_hostlist_add() - Add a lport to lports list
1784 * @lp: ptr to the fc_lport to be added
1786 * Returns: 0 for success
1788 int fcoe_hostlist_add(const struct fc_lport
*lp
)
1790 struct fcoe_softc
*fc
;
1792 fc
= fcoe_hostlist_lookup_softc(fcoe_netdev(lp
));
1794 fc
= lport_priv(lp
);
1795 write_lock_bh(&fcoe_hostlist_lock
);
1796 list_add_tail(&fc
->list
, &fcoe_hostlist
);
1797 write_unlock_bh(&fcoe_hostlist_lock
);
1803 * fcoe_hostlist_remove() - remove a lport from lports list
1804 * @lp: ptr to the fc_lport to be removed
1806 * Returns: 0 for success
1808 int fcoe_hostlist_remove(const struct fc_lport
*lp
)
1810 struct fcoe_softc
*fc
;
1812 fc
= fcoe_hostlist_lookup_softc(fcoe_netdev(lp
));
1814 write_lock_bh(&fcoe_hostlist_lock
);
1815 list_del(&fc
->list
);
1816 write_unlock_bh(&fcoe_hostlist_lock
);
1822 * fcoe_init() - fcoe module loading initialization
1824 * Returns 0 on success, negative on failure
1826 static int __init
fcoe_init(void)
1830 struct fcoe_percpu_s
*p
;
1832 INIT_LIST_HEAD(&fcoe_hostlist
);
1833 rwlock_init(&fcoe_hostlist_lock
);
1835 for_each_possible_cpu(cpu
) {
1836 p
= &per_cpu(fcoe_percpu
, cpu
);
1837 skb_queue_head_init(&p
->fcoe_rx_list
);
1840 for_each_online_cpu(cpu
)
1841 fcoe_percpu_thread_create(cpu
);
1843 /* Initialize per CPU interrupt thread */
1844 rc
= register_hotcpu_notifier(&fcoe_cpu_notifier
);
1848 /* Setup link change notification */
1851 setup_timer(&fcoe_timer
, fcoe_watchdog
, 0);
1853 mod_timer(&fcoe_timer
, jiffies
+ (10 * HZ
));
1860 for_each_online_cpu(cpu
) {
1861 fcoe_percpu_thread_destroy(cpu
);
1866 module_init(fcoe_init
);
1869 * fcoe_exit() - fcoe module unloading cleanup
1871 * Returns 0 on success, negative on failure
1873 static void __exit
fcoe_exit(void)
1876 struct fcoe_softc
*fc
, *tmp
;
1880 /* Stop the timer */
1881 del_timer_sync(&fcoe_timer
);
1883 /* releases the associated fcoe hosts */
1884 list_for_each_entry_safe(fc
, tmp
, &fcoe_hostlist
, list
)
1885 fcoe_if_destroy(fc
->real_dev
);
1887 unregister_hotcpu_notifier(&fcoe_cpu_notifier
);
1889 for_each_online_cpu(cpu
) {
1890 fcoe_percpu_thread_destroy(cpu
);
1893 /* detach from scsi transport */
1896 module_exit(fcoe_exit
);