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/kernel.h>
23 #include <linux/spinlock.h>
24 #include <linux/skbuff.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/ethtool.h>
28 #include <linux/if_ether.h>
29 #include <linux/if_vlan.h>
30 #include <linux/kthread.h>
31 #include <linux/crc32.h>
32 #include <linux/cpu.h>
34 #include <linux/sysfs.h>
35 #include <linux/ctype.h>
36 #include <scsi/scsi_tcq.h>
37 #include <scsi/scsicam.h>
38 #include <scsi/scsi_transport.h>
39 #include <scsi/scsi_transport_fc.h>
40 #include <net/rtnetlink.h>
42 #include <scsi/fc/fc_encaps.h>
44 #include <scsi/libfc.h>
45 #include <scsi/fc_frame.h>
46 #include <scsi/libfcoe.h>
47 #include <scsi/fc_transport_fcoe.h>
49 static int debug_fcoe
;
51 #define FCOE_MAX_QUEUE_DEPTH 256
53 /* destination address mode */
54 #define FCOE_GW_ADDR_MODE 0x00
55 #define FCOE_FCOUI_ADDR_MODE 0x01
57 #define FCOE_WORD_TO_BYTE 4
59 MODULE_AUTHOR("Open-FCoE.org");
60 MODULE_DESCRIPTION("FCoE");
61 MODULE_LICENSE("GPL");
64 LIST_HEAD(fcoe_hostlist
);
65 DEFINE_RWLOCK(fcoe_hostlist_lock
);
66 DEFINE_TIMER(fcoe_timer
, NULL
, 0, 0);
67 struct fcoe_percpu_s
*fcoe_percpu
[NR_CPUS
];
70 /* Function Prototyes */
71 static int fcoe_check_wait_queue(struct fc_lport
*);
72 static void fcoe_insert_wait_queue_head(struct fc_lport
*, struct sk_buff
*);
73 static void fcoe_insert_wait_queue(struct fc_lport
*, struct sk_buff
*);
74 static void fcoe_recv_flogi(struct fcoe_softc
*, struct fc_frame
*, u8
*);
75 #ifdef CONFIG_HOTPLUG_CPU
76 static int fcoe_cpu_callback(struct notifier_block
*, ulong
, void *);
77 #endif /* CONFIG_HOTPLUG_CPU */
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
,
88 #ifdef CONFIG_HOTPLUG_CPU
89 static struct notifier_block fcoe_cpu_notifier
= {
90 .notifier_call
= fcoe_cpu_callback
,
94 * fcoe_create_percpu_data() - creates the associated cpu data
95 * @cpu: index for the cpu where fcoe cpu data will be created
97 * create percpu stats block, from cpu add notifier
101 static void fcoe_create_percpu_data(int cpu
)
104 struct fcoe_softc
*fc
;
106 write_lock_bh(&fcoe_hostlist_lock
);
107 list_for_each_entry(fc
, &fcoe_hostlist
, list
) {
109 if (lp
->dev_stats
[cpu
] == NULL
)
111 kzalloc(sizeof(struct fcoe_dev_stats
),
114 write_unlock_bh(&fcoe_hostlist_lock
);
118 * fcoe_destroy_percpu_data() - destroys the associated cpu data
119 * @cpu: index for the cpu where fcoe cpu data will destroyed
121 * destroy percpu stats block called by cpu add/remove notifier
125 static void fcoe_destroy_percpu_data(int cpu
)
128 struct fcoe_softc
*fc
;
130 write_lock_bh(&fcoe_hostlist_lock
);
131 list_for_each_entry(fc
, &fcoe_hostlist
, list
) {
133 kfree(lp
->dev_stats
[cpu
]);
134 lp
->dev_stats
[cpu
] = NULL
;
136 write_unlock_bh(&fcoe_hostlist_lock
);
140 * fcoe_cpu_callback() - fcoe cpu hotplug event callback
141 * @nfb: callback data block
142 * @action: event triggering the callback
143 * @hcpu: index for the cpu of this event
145 * this creates or destroys per cpu data for fcoe
147 * Returns NOTIFY_OK always.
149 static int fcoe_cpu_callback(struct notifier_block
*nfb
, unsigned long action
,
152 unsigned int cpu
= (unsigned long)hcpu
;
156 fcoe_create_percpu_data(cpu
);
159 fcoe_destroy_percpu_data(cpu
);
166 #endif /* CONFIG_HOTPLUG_CPU */
169 * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ
170 * @skb: the receive skb
171 * @dev: associated net device
173 * @odldev: last device
175 * this function will receive the packet and build fc frame and pass it up
177 * Returns: 0 for success
179 int fcoe_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
180 struct packet_type
*ptype
, struct net_device
*olddev
)
183 struct fcoe_rcv_info
*fr
;
184 struct fcoe_softc
*fc
;
185 struct fcoe_dev_stats
*stats
;
186 struct fc_frame_header
*fh
;
189 struct fcoe_percpu_s
*fps
;
191 fc
= container_of(ptype
, struct fcoe_softc
, fcoe_packet_type
);
193 if (unlikely(lp
== NULL
)) {
194 FC_DBG("cannot find hba structure");
198 if (unlikely(debug_fcoe
)) {
199 FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p "
200 "end:%p sum:%d dev:%s", skb
->len
, skb
->data_len
,
201 skb
->head
, skb
->data
, skb_tail_pointer(skb
),
202 skb_end_pointer(skb
), skb
->csum
,
203 skb
->dev
? skb
->dev
->name
: "<NULL>");
207 /* check for FCOE packet type */
208 if (unlikely(eth_hdr(skb
)->h_proto
!= htons(ETH_P_FCOE
))) {
209 FC_DBG("wrong FC type frame");
214 * Check for minimum frame length, and make sure required FCoE
215 * and FC headers are pulled into the linear data area.
217 if (unlikely((skb
->len
< FCOE_MIN_FRAME
) ||
218 !pskb_may_pull(skb
, FCOE_HEADER_LEN
)))
221 skb_set_transport_header(skb
, sizeof(struct fcoe_hdr
));
222 fh
= (struct fc_frame_header
*) skb_transport_header(skb
);
224 oxid
= ntohs(fh
->fh_ox_id
);
226 fr
= fcoe_dev_from_skb(skb
);
232 * The incoming frame exchange id(oxid) is ANDed with num of online
233 * cpu bits to get cpu_idx and then this cpu_idx is used for selecting
234 * a per cpu kernel thread from fcoe_percpu. In case the cpu is
235 * offline or no kernel thread for derived cpu_idx then cpu_idx is
236 * initialize to first online cpu index.
238 cpu_idx
= oxid
& (num_online_cpus() - 1);
239 if (!fcoe_percpu
[cpu_idx
] || !cpu_online(cpu_idx
))
240 cpu_idx
= first_cpu(cpu_online_map
);
242 fps
= fcoe_percpu
[cpu_idx
];
244 spin_lock_bh(&fps
->fcoe_rx_list
.lock
);
245 __skb_queue_tail(&fps
->fcoe_rx_list
, skb
);
246 if (fps
->fcoe_rx_list
.qlen
== 1)
247 wake_up_process(fps
->thread
);
249 spin_unlock_bh(&fps
->fcoe_rx_list
.lock
);
254 stats
= lp
->dev_stats
[smp_processor_id()];
256 stats
= lp
->dev_stats
[0];
259 stats
->ErrorFrames
++;
265 EXPORT_SYMBOL_GPL(fcoe_rcv
);
268 * fcoe_start_io() - pass to netdev to start xmit for fcoe
269 * @skb: the skb to be xmitted
271 * Returns: 0 for success
273 static inline int fcoe_start_io(struct sk_buff
*skb
)
278 rc
= dev_queue_xmit(skb
);
286 * fcoe_get_paged_crc_eof() - in case we need alloc a page for crc_eof
287 * @skb: the skb to be xmitted
290 * Returns: 0 for success
292 static int fcoe_get_paged_crc_eof(struct sk_buff
*skb
, int tlen
)
294 struct fcoe_percpu_s
*fps
;
299 fps
= fcoe_percpu
[cpu_idx
];
300 page
= fps
->crc_eof_page
;
302 page
= alloc_page(GFP_ATOMIC
);
307 fps
->crc_eof_page
= page
;
308 WARN_ON(fps
->crc_eof_offset
!= 0);
312 skb_fill_page_desc(skb
, skb_shinfo(skb
)->nr_frags
, page
,
313 fps
->crc_eof_offset
, tlen
);
315 skb
->data_len
+= tlen
;
316 skb
->truesize
+= tlen
;
317 fps
->crc_eof_offset
+= sizeof(struct fcoe_crc_eof
);
319 if (fps
->crc_eof_offset
>= PAGE_SIZE
) {
320 fps
->crc_eof_page
= NULL
;
321 fps
->crc_eof_offset
= 0;
329 * fcoe_fc_crc() - calculates FC CRC in this fcoe skb
330 * @fp: the fc_frame containg data to be checksummed
332 * This uses crc32() to calculate the crc for fc frame
333 * Return : 32 bit crc
335 u32
fcoe_fc_crc(struct fc_frame
*fp
)
337 struct sk_buff
*skb
= fp_skb(fp
);
338 struct skb_frag_struct
*frag
;
340 unsigned long off
, len
, clen
;
344 crc
= crc32(~0, skb
->data
, skb_headlen(skb
));
346 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
347 frag
= &skb_shinfo(skb
)->frags
[i
];
348 off
= frag
->page_offset
;
351 clen
= min(len
, PAGE_SIZE
- (off
& ~PAGE_MASK
));
352 data
= kmap_atomic(frag
->page
+ (off
>> PAGE_SHIFT
),
353 KM_SKB_DATA_SOFTIRQ
);
354 crc
= crc32(crc
, data
+ (off
& ~PAGE_MASK
), clen
);
355 kunmap_atomic(data
, KM_SKB_DATA_SOFTIRQ
);
362 EXPORT_SYMBOL_GPL(fcoe_fc_crc
);
365 * fcoe_xmit() - FCoE frame transmit function
366 * @lp: the associated local port
367 * @fp: the fc_frame to be transmitted
369 * Return : 0 for success
371 int fcoe_xmit(struct fc_lport
*lp
, struct fc_frame
*fp
)
376 struct fcoe_crc_eof
*cp
;
378 struct fcoe_dev_stats
*stats
;
379 struct fc_frame_header
*fh
;
380 unsigned int hlen
; /* header length implies the version */
381 unsigned int tlen
; /* trailer length */
382 unsigned int elen
; /* eth header, may include vlan */
383 int flogi_in_progress
= 0;
384 struct fcoe_softc
*fc
;
388 WARN_ON((fr_len(fp
) % sizeof(u32
)) != 0);
392 * if it is a flogi then we need to learn gw-addr
395 fh
= fc_frame_header_get(fp
);
396 if (unlikely(fh
->fh_r_ctl
== FC_RCTL_ELS_REQ
)) {
397 if (fc_frame_payload_op(fp
) == ELS_FLOGI
) {
398 fc
->flogi_oxid
= ntohs(fh
->fh_ox_id
);
399 fc
->address_mode
= FCOE_FCOUI_ADDR_MODE
;
400 fc
->flogi_progress
= 1;
401 flogi_in_progress
= 1;
402 } else if (fc
->flogi_progress
&& ntoh24(fh
->fh_s_id
) != 0) {
404 * Here we must've gotten an SID by accepting an FLOGI
405 * from a point-to-point connection. Switch to using
406 * the source mac based on the SID. The destination
407 * MAC in this case would have been set by receving the
410 fc_fcoe_set_mac(fc
->data_src_addr
, fh
->fh_s_id
);
411 fc
->flogi_progress
= 0;
419 elen
= (fc
->real_dev
->priv_flags
& IFF_802_1Q_VLAN
) ?
420 sizeof(struct vlan_ethhdr
) : sizeof(struct ethhdr
);
421 hlen
= sizeof(struct fcoe_hdr
);
422 tlen
= sizeof(struct fcoe_crc_eof
);
423 wlen
= (skb
->len
- tlen
+ sizeof(crc
)) / FCOE_WORD_TO_BYTE
;
426 if (likely(lp
->crc_offload
)) {
427 skb
->ip_summed
= CHECKSUM_COMPLETE
;
428 skb
->csum_start
= skb_headroom(skb
);
429 skb
->csum_offset
= skb
->len
;
432 skb
->ip_summed
= CHECKSUM_NONE
;
433 crc
= fcoe_fc_crc(fp
);
436 /* copy fc crc and eof to the skb buff */
437 if (skb_is_nonlinear(skb
)) {
439 if (fcoe_get_paged_crc_eof(skb
, tlen
)) {
443 frag
= &skb_shinfo(skb
)->frags
[skb_shinfo(skb
)->nr_frags
- 1];
444 cp
= kmap_atomic(frag
->page
, KM_SKB_DATA_SOFTIRQ
)
447 cp
= (struct fcoe_crc_eof
*)skb_put(skb
, tlen
);
450 memset(cp
, 0, sizeof(*cp
));
452 cp
->fcoe_crc32
= cpu_to_le32(~crc
);
454 if (skb_is_nonlinear(skb
)) {
455 kunmap_atomic(cp
, KM_SKB_DATA_SOFTIRQ
);
459 /* adjust skb netowrk/transport offsets to match mac/fcoe/fc */
460 skb_push(skb
, elen
+ hlen
);
461 skb_reset_mac_header(skb
);
462 skb_reset_network_header(skb
);
464 skb
->protocol
= htons(ETH_P_802_3
);
465 skb
->dev
= fc
->real_dev
;
467 /* fill up mac and fcoe headers */
469 eh
->h_proto
= htons(ETH_P_FCOE
);
470 if (fc
->address_mode
== FCOE_FCOUI_ADDR_MODE
)
471 fc_fcoe_set_mac(eh
->h_dest
, fh
->fh_d_id
);
473 /* insert GW address */
474 memcpy(eh
->h_dest
, fc
->dest_addr
, ETH_ALEN
);
476 if (unlikely(flogi_in_progress
))
477 memcpy(eh
->h_source
, fc
->ctl_src_addr
, ETH_ALEN
);
479 memcpy(eh
->h_source
, fc
->data_src_addr
, ETH_ALEN
);
481 hp
= (struct fcoe_hdr
*)(eh
+ 1);
482 memset(hp
, 0, sizeof(*hp
));
484 FC_FCOE_ENCAPS_VER(hp
, FC_FCOE_VER
);
487 /* update tx stats: regardless if LLD fails */
488 stats
= lp
->dev_stats
[smp_processor_id()];
491 stats
->TxWords
+= wlen
;
494 /* send down to lld */
496 if (fc
->fcoe_pending_queue
.qlen
)
497 rc
= fcoe_check_wait_queue(lp
);
500 rc
= fcoe_start_io(skb
);
503 fcoe_insert_wait_queue(lp
, skb
);
504 if (fc
->fcoe_pending_queue
.qlen
> FCOE_MAX_QUEUE_DEPTH
)
510 EXPORT_SYMBOL_GPL(fcoe_xmit
);
513 * fcoe_percpu_receive_thread() - recv thread per cpu
514 * @arg: ptr to the fcoe per cpu struct
516 * Return: 0 for success
518 int fcoe_percpu_receive_thread(void *arg
)
520 struct fcoe_percpu_s
*p
= arg
;
523 struct fcoe_rcv_info
*fr
;
524 struct fcoe_dev_stats
*stats
;
525 struct fc_frame_header
*fh
;
527 struct fcoe_crc_eof crc_eof
;
530 struct fcoe_softc
*fc
;
533 set_user_nice(current
, 19);
535 while (!kthread_should_stop()) {
537 spin_lock_bh(&p
->fcoe_rx_list
.lock
);
538 while ((skb
= __skb_dequeue(&p
->fcoe_rx_list
)) == NULL
) {
539 set_current_state(TASK_INTERRUPTIBLE
);
540 spin_unlock_bh(&p
->fcoe_rx_list
.lock
);
542 set_current_state(TASK_RUNNING
);
543 if (kthread_should_stop())
545 spin_lock_bh(&p
->fcoe_rx_list
.lock
);
547 spin_unlock_bh(&p
->fcoe_rx_list
.lock
);
548 fr
= fcoe_dev_from_skb(skb
);
550 if (unlikely(lp
== NULL
)) {
551 FC_DBG("invalid HBA Structure");
556 stats
= lp
->dev_stats
[smp_processor_id()];
558 if (unlikely(debug_fcoe
)) {
559 FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p "
560 "tail:%p end:%p sum:%d dev:%s",
561 skb
->len
, skb
->data_len
,
562 skb
->head
, skb
->data
, skb_tail_pointer(skb
),
563 skb_end_pointer(skb
), skb
->csum
,
564 skb
->dev
? skb
->dev
->name
: "<NULL>");
568 * Save source MAC address before discarding header.
571 if (unlikely(fc
->flogi_progress
))
572 mac
= eth_hdr(skb
)->h_source
;
574 if (skb_is_nonlinear(skb
))
575 skb_linearize(skb
); /* not ideal */
578 * Frame length checks and setting up the header pointers
579 * was done in fcoe_rcv already.
581 hp
= (struct fcoe_hdr
*) skb_network_header(skb
);
582 fh
= (struct fc_frame_header
*) skb_transport_header(skb
);
584 if (unlikely(FC_FCOE_DECAPS_VER(hp
) != FC_FCOE_VER
)) {
586 if (stats
->ErrorFrames
< 5)
587 FC_DBG("unknown FCoE version %x",
588 FC_FCOE_DECAPS_VER(hp
));
589 stats
->ErrorFrames
++;
595 skb_pull(skb
, sizeof(struct fcoe_hdr
));
596 fr_len
= skb
->len
- sizeof(struct fcoe_crc_eof
);
600 stats
->RxWords
+= fr_len
/ FCOE_WORD_TO_BYTE
;
603 fp
= (struct fc_frame
*)skb
;
606 fr_sof(fp
) = hp
->fcoe_sof
;
608 /* Copy out the CRC and EOF trailer for access */
609 if (skb_copy_bits(skb
, fr_len
, &crc_eof
, sizeof(crc_eof
))) {
613 fr_eof(fp
) = crc_eof
.fcoe_eof
;
614 fr_crc(fp
) = crc_eof
.fcoe_crc32
;
615 if (pskb_trim(skb
, fr_len
)) {
621 * We only check CRC if no offload is available and if it is
622 * it's solicited data, in which case, the FCP layer would
623 * check it during the copy.
626 fr_flags(fp
) &= ~FCPHF_CRC_UNCHECKED
;
628 fr_flags(fp
) |= FCPHF_CRC_UNCHECKED
;
630 fh
= fc_frame_header_get(fp
);
631 if (fh
->fh_r_ctl
== FC_RCTL_DD_SOL_DATA
&&
632 fh
->fh_type
== FC_TYPE_FCP
) {
633 fc_exch_recv(lp
, lp
->emp
, fp
);
636 if (fr_flags(fp
) & FCPHF_CRC_UNCHECKED
) {
637 if (le32_to_cpu(fr_crc(fp
)) !=
638 ~crc32(~0, skb
->data
, fr_len
)) {
639 if (debug_fcoe
|| stats
->InvalidCRCCount
< 5)
640 printk(KERN_WARNING
"fcoe: dropping "
641 "frame with CRC error\n");
642 stats
->InvalidCRCCount
++;
643 stats
->ErrorFrames
++;
647 fr_flags(fp
) &= ~FCPHF_CRC_UNCHECKED
;
649 /* non flogi and non data exchanges are handled here */
650 if (unlikely(fc
->flogi_progress
))
651 fcoe_recv_flogi(fc
, fp
, mac
);
652 fc_exch_recv(lp
, lp
->emp
, fp
);
658 * fcoe_recv_flogi() - flogi receive function
659 * @fc: associated fcoe_softc
660 * @fp: the recieved frame
661 * @sa: the source address of this flogi
663 * This is responsible to parse the flogi response and sets the corresponding
664 * mac address for the initiator, eitehr OUI based or GW based.
668 static void fcoe_recv_flogi(struct fcoe_softc
*fc
, struct fc_frame
*fp
, u8
*sa
)
670 struct fc_frame_header
*fh
;
673 fh
= fc_frame_header_get(fp
);
674 if (fh
->fh_type
!= FC_TYPE_ELS
)
676 op
= fc_frame_payload_op(fp
);
677 if (op
== ELS_LS_ACC
&& fh
->fh_r_ctl
== FC_RCTL_ELS_REP
&&
678 fc
->flogi_oxid
== ntohs(fh
->fh_ox_id
)) {
681 * If the src mac addr is FC_OUI-based, then we mark the
682 * address_mode flag to use FC_OUI-based Ethernet DA.
683 * Otherwise we use the FCoE gateway addr
685 if (!compare_ether_addr(sa
, (u8
[6]) FC_FCOE_FLOGI_MAC
)) {
686 fc
->address_mode
= FCOE_FCOUI_ADDR_MODE
;
688 memcpy(fc
->dest_addr
, sa
, ETH_ALEN
);
689 fc
->address_mode
= FCOE_GW_ADDR_MODE
;
693 * Remove any previously-set unicast MAC filter.
694 * Add secondary FCoE MAC address filter for our OUI.
697 if (compare_ether_addr(fc
->data_src_addr
, (u8
[6]) { 0 }))
698 dev_unicast_delete(fc
->real_dev
, fc
->data_src_addr
,
700 fc_fcoe_set_mac(fc
->data_src_addr
, fh
->fh_d_id
);
701 dev_unicast_add(fc
->real_dev
, fc
->data_src_addr
, ETH_ALEN
);
704 fc
->flogi_progress
= 0;
705 } else if (op
== ELS_FLOGI
&& fh
->fh_r_ctl
== FC_RCTL_ELS_REQ
&& sa
) {
707 * Save source MAC for point-to-point responses.
709 memcpy(fc
->dest_addr
, sa
, ETH_ALEN
);
710 fc
->address_mode
= FCOE_GW_ADDR_MODE
;
715 * fcoe_watchdog() - fcoe timer callback
718 * This checks the pending queue length for fcoe and set lport qfull
719 * if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the
722 * Returns: 0 for success
724 void fcoe_watchdog(ulong vp
)
727 struct fcoe_softc
*fc
;
730 read_lock(&fcoe_hostlist_lock
);
731 list_for_each_entry(fc
, &fcoe_hostlist
, list
) {
734 if (fc
->fcoe_pending_queue
.qlen
> FCOE_MAX_QUEUE_DEPTH
)
736 if (fcoe_check_wait_queue(lp
) < FCOE_MAX_QUEUE_DEPTH
) {
742 read_unlock(&fcoe_hostlist_lock
);
744 fcoe_timer
.expires
= jiffies
+ (1 * HZ
);
745 add_timer(&fcoe_timer
);
750 * fcoe_check_wait_queue() - put the skb into fcoe pending xmit queue
751 * @lp: the fc_port for this skb
752 * @skb: the associated skb to be xmitted
754 * This empties the wait_queue, dequeue the head of the wait_queue queue
755 * and calls fcoe_start_io() for each packet, if all skb have been
756 * transmitted, return 0 if a error occurs, then restore wait_queue and
759 * The wait_queue is used when the skb transmit fails. skb will go
760 * in the wait_queue which will be emptied by the time function OR
761 * by the next skb transmit.
763 * Returns: 0 for success
765 static int fcoe_check_wait_queue(struct fc_lport
*lp
)
769 struct fcoe_softc
*fc
;
772 spin_lock_bh(&fc
->fcoe_pending_queue
.lock
);
775 * if interface pending queue full then set qfull in lport.
777 if (fc
->fcoe_pending_queue
.qlen
> FCOE_MAX_QUEUE_DEPTH
)
779 if (fc
->fcoe_pending_queue
.qlen
) {
780 while ((skb
= __skb_dequeue(&fc
->fcoe_pending_queue
)) != NULL
) {
781 spin_unlock_bh(&fc
->fcoe_pending_queue
.lock
);
782 rc
= fcoe_start_io(skb
);
784 fcoe_insert_wait_queue_head(lp
, skb
);
787 spin_lock_bh(&fc
->fcoe_pending_queue
.lock
);
789 if (fc
->fcoe_pending_queue
.qlen
< FCOE_MAX_QUEUE_DEPTH
)
792 spin_unlock_bh(&fc
->fcoe_pending_queue
.lock
);
793 return fc
->fcoe_pending_queue
.qlen
;
797 * fcoe_insert_wait_queue_head() - puts skb to fcoe pending queue head
798 * @lp: the fc_port for this skb
799 * @skb: the associated skb to be xmitted
803 static void fcoe_insert_wait_queue_head(struct fc_lport
*lp
,
806 struct fcoe_softc
*fc
;
809 spin_lock_bh(&fc
->fcoe_pending_queue
.lock
);
810 __skb_queue_head(&fc
->fcoe_pending_queue
, skb
);
811 spin_unlock_bh(&fc
->fcoe_pending_queue
.lock
);
815 * fcoe_insert_wait_queue() - put the skb into fcoe pending queue tail
816 * @lp: the fc_port for this skb
817 * @skb: the associated skb to be xmitted
821 static void fcoe_insert_wait_queue(struct fc_lport
*lp
,
824 struct fcoe_softc
*fc
;
827 spin_lock_bh(&fc
->fcoe_pending_queue
.lock
);
828 __skb_queue_tail(&fc
->fcoe_pending_queue
, skb
);
829 spin_unlock_bh(&fc
->fcoe_pending_queue
.lock
);
833 * fcoe_dev_setup() - setup link change notification interface
835 static void fcoe_dev_setup()
838 * here setup a interface specific wd time to
839 * monitor the link state
841 register_netdevice_notifier(&fcoe_notifier
);
845 * fcoe_dev_setup() - cleanup link change notification interface
847 static void fcoe_dev_cleanup(void)
849 unregister_netdevice_notifier(&fcoe_notifier
);
853 * fcoe_device_notification() - netdev event notification callback
854 * @notifier: context of the notification
855 * @event: type of event
856 * @ptr: fixed array for output parsed ifname
858 * This function is called by the ethernet driver in case of link change event
860 * Returns: 0 for success
862 static int fcoe_device_notification(struct notifier_block
*notifier
,
863 ulong event
, void *ptr
)
865 struct fc_lport
*lp
= NULL
;
866 struct net_device
*real_dev
= ptr
;
867 struct fcoe_softc
*fc
;
868 struct fcoe_dev_stats
*stats
;
873 read_lock(&fcoe_hostlist_lock
);
874 list_for_each_entry(fc
, &fcoe_hostlist
, list
) {
875 if (fc
->real_dev
== real_dev
) {
880 read_unlock(&fcoe_hostlist_lock
);
886 new_link_up
= lp
->link_up
;
889 case NETDEV_GOING_DOWN
:
894 new_link_up
= !fcoe_link_ok(lp
);
896 case NETDEV_CHANGEMTU
:
897 mfs
= fc
->real_dev
->mtu
-
898 (sizeof(struct fcoe_hdr
) +
899 sizeof(struct fcoe_crc_eof
));
900 if (mfs
>= FC_MIN_MAX_FRAME
)
902 new_link_up
= !fcoe_link_ok(lp
);
904 case NETDEV_REGISTER
:
907 FC_DBG("unknown event %ld call", event
);
909 if (lp
->link_up
!= new_link_up
) {
913 stats
= lp
->dev_stats
[smp_processor_id()];
915 stats
->LinkFailureCount
++;
917 fcoe_clean_pending_queue(lp
);
925 * fcoe_if_to_netdev() - parse a name buffer to get netdev
926 * @ifname: fixed array for output parsed ifname
927 * @buffer: incoming buffer to be copied
929 * Returns: NULL or ptr to netdeive
931 static struct net_device
*fcoe_if_to_netdev(const char *buffer
)
934 char ifname
[IFNAMSIZ
+ 2];
937 strlcpy(ifname
, buffer
, IFNAMSIZ
);
938 cp
= ifname
+ strlen(ifname
);
939 while (--cp
>= ifname
&& *cp
== '\n')
941 return dev_get_by_name(&init_net
, ifname
);
947 * fcoe_netdev_to_module_owner() - finds out the nic drive moddule of the netdev
948 * @netdev: the target netdev
950 * Returns: ptr to the struct module, NULL for failure
952 static struct module
*
953 fcoe_netdev_to_module_owner(const struct net_device
*netdev
)
960 dev
= netdev
->dev
.parent
;
967 return dev
->driver
->owner
;
971 * fcoe_ethdrv_get() - Hold the Ethernet driver
972 * @netdev: the target netdev
974 * Holds the Ethernet driver module by try_module_get() for
975 * the corresponding netdev.
977 * Returns: 0 for succsss
979 static int fcoe_ethdrv_get(const struct net_device
*netdev
)
981 struct module
*owner
;
983 owner
= fcoe_netdev_to_module_owner(netdev
);
985 printk(KERN_DEBUG
"fcoe:hold driver module %s for %s\n",
986 module_name(owner
), netdev
->name
);
987 return try_module_get(owner
);
993 * fcoe_ethdrv_put() - Release the Ethernet driver
994 * @netdev: the target netdev
996 * Releases the Ethernet driver module by module_put for
997 * the corresponding netdev.
999 * Returns: 0 for succsss
1001 static int fcoe_ethdrv_put(const struct net_device
*netdev
)
1003 struct module
*owner
;
1005 owner
= fcoe_netdev_to_module_owner(netdev
);
1007 printk(KERN_DEBUG
"fcoe:release driver module %s for %s\n",
1008 module_name(owner
), netdev
->name
);
1016 * fcoe_destroy() - handles the destroy from sysfs
1017 * @buffer: expcted to be a eth if name
1018 * @kp: associated kernel param
1020 * Returns: 0 for success
1022 static int fcoe_destroy(const char *buffer
, struct kernel_param
*kp
)
1025 struct net_device
*netdev
;
1027 netdev
= fcoe_if_to_netdev(buffer
);
1032 /* look for existing lport */
1033 if (!fcoe_hostlist_lookup(netdev
)) {
1037 /* pass to transport */
1038 rc
= fcoe_transport_release(netdev
);
1040 printk(KERN_ERR
"fcoe: fcoe_transport_release(%s) failed\n",
1045 fcoe_ethdrv_put(netdev
);
1054 * fcoe_create() - Handles the create call from sysfs
1055 * @buffer: expcted to be a eth if name
1056 * @kp: associated kernel param
1058 * Returns: 0 for success
1060 static int fcoe_create(const char *buffer
, struct kernel_param
*kp
)
1063 struct net_device
*netdev
;
1065 netdev
= fcoe_if_to_netdev(buffer
);
1070 /* look for existing lport */
1071 if (fcoe_hostlist_lookup(netdev
)) {
1075 fcoe_ethdrv_get(netdev
);
1077 /* pass to transport */
1078 rc
= fcoe_transport_attach(netdev
);
1080 printk(KERN_ERR
"fcoe: fcoe_transport_attach(%s) failed\n",
1082 fcoe_ethdrv_put(netdev
);
1093 module_param_call(create
, fcoe_create
, NULL
, NULL
, S_IWUSR
);
1094 __MODULE_PARM_TYPE(create
, "string");
1095 MODULE_PARM_DESC(create
, "Create fcoe port using net device passed in.");
1096 module_param_call(destroy
, fcoe_destroy
, NULL
, NULL
, S_IWUSR
);
1097 __MODULE_PARM_TYPE(destroy
, "string");
1098 MODULE_PARM_DESC(destroy
, "Destroy fcoe port");
1101 * fcoe_link_ok() - Check if link is ok for the fc_lport
1102 * @lp: ptr to the fc_lport
1104 * Any permanently-disqualifying conditions have been previously checked.
1105 * This also updates the speed setting, which may change with link for 100/1000.
1107 * This function should probably be checking for PAUSE support at some point
1108 * in the future. Currently Per-priority-pause is not determinable using
1109 * ethtool, so we shouldn't be restrictive until that problem is resolved.
1111 * Returns: 0 if link is OK for use by FCoE.
1114 int fcoe_link_ok(struct fc_lport
*lp
)
1116 struct fcoe_softc
*fc
= fcoe_softc(lp
);
1117 struct net_device
*dev
= fc
->real_dev
;
1118 struct ethtool_cmd ecmd
= { ETHTOOL_GSET
};
1121 if ((dev
->flags
& IFF_UP
) && netif_carrier_ok(dev
)) {
1123 if (dev
->ethtool_ops
->get_settings
) {
1124 dev
->ethtool_ops
->get_settings(dev
, &ecmd
);
1125 lp
->link_supported_speeds
&=
1126 ~(FC_PORTSPEED_1GBIT
| FC_PORTSPEED_10GBIT
);
1127 if (ecmd
.supported
& (SUPPORTED_1000baseT_Half
|
1128 SUPPORTED_1000baseT_Full
))
1129 lp
->link_supported_speeds
|= FC_PORTSPEED_1GBIT
;
1130 if (ecmd
.supported
& SUPPORTED_10000baseT_Full
)
1131 lp
->link_supported_speeds
|=
1132 FC_PORTSPEED_10GBIT
;
1133 if (ecmd
.speed
== SPEED_1000
)
1134 lp
->link_speed
= FC_PORTSPEED_1GBIT
;
1135 if (ecmd
.speed
== SPEED_10000
)
1136 lp
->link_speed
= FC_PORTSPEED_10GBIT
;
1143 EXPORT_SYMBOL_GPL(fcoe_link_ok
);
1146 * fcoe_percpu_clean() - Clear the pending skbs for an lport
1149 void fcoe_percpu_clean(struct fc_lport
*lp
)
1152 struct fcoe_percpu_s
*pp
;
1153 struct fcoe_rcv_info
*fr
;
1154 struct sk_buff_head
*list
;
1155 struct sk_buff
*skb
, *next
;
1156 struct sk_buff
*head
;
1158 for (idx
= 0; idx
< NR_CPUS
; idx
++) {
1159 if (fcoe_percpu
[idx
]) {
1160 pp
= fcoe_percpu
[idx
];
1161 spin_lock_bh(&pp
->fcoe_rx_list
.lock
);
1162 list
= &pp
->fcoe_rx_list
;
1164 for (skb
= head
; skb
!= (struct sk_buff
*)list
;
1167 fr
= fcoe_dev_from_skb(skb
);
1168 if (fr
->fr_dev
== lp
) {
1169 __skb_unlink(skb
, list
);
1173 spin_unlock_bh(&pp
->fcoe_rx_list
.lock
);
1177 EXPORT_SYMBOL_GPL(fcoe_percpu_clean
);
1180 * fcoe_clean_pending_queue() - Dequeue a skb and free it
1181 * @lp: the corresponding fc_lport
1185 void fcoe_clean_pending_queue(struct fc_lport
*lp
)
1187 struct fcoe_softc
*fc
= lport_priv(lp
);
1188 struct sk_buff
*skb
;
1190 spin_lock_bh(&fc
->fcoe_pending_queue
.lock
);
1191 while ((skb
= __skb_dequeue(&fc
->fcoe_pending_queue
)) != NULL
) {
1192 spin_unlock_bh(&fc
->fcoe_pending_queue
.lock
);
1194 spin_lock_bh(&fc
->fcoe_pending_queue
.lock
);
1196 spin_unlock_bh(&fc
->fcoe_pending_queue
.lock
);
1198 EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue
);
1201 * libfc_host_alloc() - Allocate a Scsi_Host with room for the fc_lport
1202 * @sht: ptr to the scsi host templ
1203 * @priv_size: size of private data after fc_lport
1205 * Returns: ptr to Scsi_Host
1208 static inline struct Scsi_Host
*
1209 libfc_host_alloc(struct scsi_host_template
*sht
, int priv_size
)
1211 return scsi_host_alloc(sht
, sizeof(struct fc_lport
) + priv_size
);
1215 * fcoe_host_alloc() - Allocate a Scsi_Host with room for the fcoe_softc
1216 * @sht: ptr to the scsi host templ
1217 * @priv_size: size of private data after fc_lport
1219 * Returns: ptr to Scsi_Host
1221 struct Scsi_Host
*fcoe_host_alloc(struct scsi_host_template
*sht
, int priv_size
)
1223 return libfc_host_alloc(sht
, sizeof(struct fcoe_softc
) + priv_size
);
1225 EXPORT_SYMBOL_GPL(fcoe_host_alloc
);
1228 * fcoe_reset() - Resets the fcoe
1229 * @shost: shost the reset is from
1233 int fcoe_reset(struct Scsi_Host
*shost
)
1235 struct fc_lport
*lport
= shost_priv(shost
);
1236 fc_lport_reset(lport
);
1239 EXPORT_SYMBOL_GPL(fcoe_reset
);
1242 * fcoe_wwn_from_mac() - Converts 48-bit IEEE MAC address to 64-bit FC WWN.
1244 * @scheme: check port
1245 * @port: port indicator for converting
1247 * Returns: u64 fc world wide name
1249 u64
fcoe_wwn_from_mac(unsigned char mac
[MAX_ADDR_LEN
],
1250 unsigned int scheme
, unsigned int port
)
1255 /* The MAC is in NO, so flip only the low 48 bits */
1256 host_mac
= ((u64
) mac
[0] << 40) |
1257 ((u64
) mac
[1] << 32) |
1258 ((u64
) mac
[2] << 24) |
1259 ((u64
) mac
[3] << 16) |
1260 ((u64
) mac
[4] << 8) |
1263 WARN_ON(host_mac
>= (1ULL << 48));
1264 wwn
= host_mac
| ((u64
) scheme
<< 60);
1270 WARN_ON(port
>= 0xfff);
1271 wwn
|= (u64
) port
<< 48;
1280 EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac
);
1283 * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device
1284 * @device: this is currently ptr to net_device
1286 * Returns: NULL or the located fcoe_softc
1288 static struct fcoe_softc
*
1289 fcoe_hostlist_lookup_softc(const struct net_device
*dev
)
1291 struct fcoe_softc
*fc
;
1293 read_lock(&fcoe_hostlist_lock
);
1294 list_for_each_entry(fc
, &fcoe_hostlist
, list
) {
1295 if (fc
->real_dev
== dev
) {
1296 read_unlock(&fcoe_hostlist_lock
);
1300 read_unlock(&fcoe_hostlist_lock
);
1305 * fcoe_hostlist_lookup() - Find the corresponding lport by netdev
1306 * @netdev: ptr to net_device
1308 * Returns: 0 for success
1310 struct fc_lport
*fcoe_hostlist_lookup(const struct net_device
*netdev
)
1312 struct fcoe_softc
*fc
;
1314 fc
= fcoe_hostlist_lookup_softc(netdev
);
1316 return (fc
) ? fc
->lp
: NULL
;
1318 EXPORT_SYMBOL_GPL(fcoe_hostlist_lookup
);
1321 * fcoe_hostlist_add() - Add a lport to lports list
1322 * @lp: ptr to the fc_lport to badded
1324 * Returns: 0 for success
1326 int fcoe_hostlist_add(const struct fc_lport
*lp
)
1328 struct fcoe_softc
*fc
;
1330 fc
= fcoe_hostlist_lookup_softc(fcoe_netdev(lp
));
1332 fc
= fcoe_softc(lp
);
1333 write_lock_bh(&fcoe_hostlist_lock
);
1334 list_add_tail(&fc
->list
, &fcoe_hostlist
);
1335 write_unlock_bh(&fcoe_hostlist_lock
);
1339 EXPORT_SYMBOL_GPL(fcoe_hostlist_add
);
1342 * fcoe_hostlist_remove() - remove a lport from lports list
1343 * @lp: ptr to the fc_lport to badded
1345 * Returns: 0 for success
1347 int fcoe_hostlist_remove(const struct fc_lport
*lp
)
1349 struct fcoe_softc
*fc
;
1351 fc
= fcoe_hostlist_lookup_softc(fcoe_netdev(lp
));
1353 write_lock_bh(&fcoe_hostlist_lock
);
1354 list_del(&fc
->list
);
1355 write_unlock_bh(&fcoe_hostlist_lock
);
1359 EXPORT_SYMBOL_GPL(fcoe_hostlist_remove
);
1362 * fcoe_libfc_config() - sets up libfc related properties for lport
1363 * @lp: ptr to the fc_lport
1364 * @tt: libfc function template
1366 * Returns : 0 for success
1368 int fcoe_libfc_config(struct fc_lport
*lp
, struct libfc_function_template
*tt
)
1370 /* Set the function pointers set by the LLDD */
1371 memcpy(&lp
->tt
, tt
, sizeof(*tt
));
1372 if (fc_fcp_init(lp
))
1382 EXPORT_SYMBOL_GPL(fcoe_libfc_config
);
1385 * fcoe_init() - fcoe module loading initialization
1387 * Initialization routine
1388 * 1. Will create fc transport software structure
1389 * 2. initialize the link list of port information structure
1391 * Returns 0 on success, negative on failure
1393 static int __init
fcoe_init(void)
1396 struct fcoe_percpu_s
*p
;
1399 INIT_LIST_HEAD(&fcoe_hostlist
);
1400 rwlock_init(&fcoe_hostlist_lock
);
1402 #ifdef CONFIG_HOTPLUG_CPU
1403 register_cpu_notifier(&fcoe_cpu_notifier
);
1404 #endif /* CONFIG_HOTPLUG_CPU */
1407 * initialize per CPU interrupt thread
1409 for_each_online_cpu(cpu
) {
1410 p
= kzalloc(sizeof(struct fcoe_percpu_s
), GFP_KERNEL
);
1412 p
->thread
= kthread_create(fcoe_percpu_receive_thread
,
1414 "fcoethread/%d", cpu
);
1417 * if there is no error then bind the thread to the cpu
1418 * initialize the semaphore and skb queue head
1420 if (likely(!IS_ERR(p
->thread
))) {
1422 fcoe_percpu
[cpu
] = p
;
1423 skb_queue_head_init(&p
->fcoe_rx_list
);
1424 kthread_bind(p
->thread
, cpu
);
1425 wake_up_process(p
->thread
);
1427 fcoe_percpu
[cpu
] = NULL
;
1434 * setup link change notification
1438 init_timer(&fcoe_timer
);
1439 fcoe_timer
.data
= 0;
1440 fcoe_timer
.function
= fcoe_watchdog
;
1441 fcoe_timer
.expires
= (jiffies
+ (10 * HZ
));
1442 add_timer(&fcoe_timer
);
1444 /* initiatlize the fcoe transport */
1445 fcoe_transport_init();
1451 module_init(fcoe_init
);
1454 * fcoe_exit() - fcoe module unloading cleanup
1456 * Returns 0 on success, negative on failure
1458 static void __exit
fcoe_exit(void)
1461 struct fcoe_softc
*fc
, *tmp
;
1462 struct fcoe_percpu_s
*p
;
1463 struct sk_buff
*skb
;
1466 * Stop all call back interfaces
1468 #ifdef CONFIG_HOTPLUG_CPU
1469 unregister_cpu_notifier(&fcoe_cpu_notifier
);
1470 #endif /* CONFIG_HOTPLUG_CPU */
1476 del_timer_sync(&fcoe_timer
);
1478 /* releases the associated fcoe transport for each lport */
1479 list_for_each_entry_safe(fc
, tmp
, &fcoe_hostlist
, list
)
1480 fcoe_transport_release(fc
->real_dev
);
1482 for (idx
= 0; idx
< NR_CPUS
; idx
++) {
1483 if (fcoe_percpu
[idx
]) {
1484 kthread_stop(fcoe_percpu
[idx
]->thread
);
1485 p
= fcoe_percpu
[idx
];
1486 spin_lock_bh(&p
->fcoe_rx_list
.lock
);
1487 while ((skb
= __skb_dequeue(&p
->fcoe_rx_list
)) != NULL
)
1489 spin_unlock_bh(&p
->fcoe_rx_list
.lock
);
1490 if (fcoe_percpu
[idx
]->crc_eof_page
)
1491 put_page(fcoe_percpu
[idx
]->crc_eof_page
);
1492 kfree(fcoe_percpu
[idx
]);
1496 /* remove sw trasnport */
1499 /* detach the transport */
1500 fcoe_transport_exit();
1502 module_exit(fcoe_exit
);