blob: e419f486cdb333ab53cf693209a251378093b943 [file] [log] [blame]
Robert Love85b4aa42008-12-09 15:10:24 -08001/*
2 * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
3 *
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.
7 *
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
11 * more details.
12 *
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.
16 *
17 * Maintained at www.Open-FCoE.org
18 */
19
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>
33#include <linux/fs.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>
41
42#include <scsi/fc/fc_encaps.h>
43
44#include <scsi/libfc.h>
45#include <scsi/fc_frame.h>
46#include <scsi/libfcoe.h>
47#include <scsi/fc_transport_fcoe.h>
48
49static int debug_fcoe;
50
51#define FCOE_MAX_QUEUE_DEPTH 256
52
53/* destination address mode */
54#define FCOE_GW_ADDR_MODE 0x00
55#define FCOE_FCOUI_ADDR_MODE 0x01
56
57#define FCOE_WORD_TO_BYTE 4
58
59MODULE_AUTHOR("Open-FCoE.org");
60MODULE_DESCRIPTION("FCoE");
61MODULE_LICENSE("GPL");
62
63/* fcoe host list */
64LIST_HEAD(fcoe_hostlist);
65DEFINE_RWLOCK(fcoe_hostlist_lock);
66DEFINE_TIMER(fcoe_timer, NULL, 0, 0);
67struct fcoe_percpu_s *fcoe_percpu[NR_CPUS];
68
69
70/* Function Prototyes */
71static int fcoe_check_wait_queue(struct fc_lport *);
72static void fcoe_insert_wait_queue_head(struct fc_lport *, struct sk_buff *);
73static void fcoe_insert_wait_queue(struct fc_lport *, struct sk_buff *);
74static void fcoe_recv_flogi(struct fcoe_softc *, struct fc_frame *, u8 *);
75#ifdef CONFIG_HOTPLUG_CPU
76static int fcoe_cpu_callback(struct notifier_block *, ulong, void *);
77#endif /* CONFIG_HOTPLUG_CPU */
78static int fcoe_device_notification(struct notifier_block *, ulong, void *);
79static void fcoe_dev_setup(void);
80static void fcoe_dev_cleanup(void);
81
82/* notification function from net device */
83static struct notifier_block fcoe_notifier = {
84 .notifier_call = fcoe_device_notification,
85};
86
87
88#ifdef CONFIG_HOTPLUG_CPU
89static struct notifier_block fcoe_cpu_notifier = {
90 .notifier_call = fcoe_cpu_callback,
91};
92
93/**
94 * fcoe_create_percpu_data - creates the associated cpu data
95 * @cpu: index for the cpu where fcoe cpu data will be created
96 *
97 * create percpu stats block, from cpu add notifier
98 *
99 * Returns: none
100 **/
101static void fcoe_create_percpu_data(int cpu)
102{
103 struct fc_lport *lp;
104 struct fcoe_softc *fc;
105
106 write_lock_bh(&fcoe_hostlist_lock);
107 list_for_each_entry(fc, &fcoe_hostlist, list) {
108 lp = fc->lp;
109 if (lp->dev_stats[cpu] == NULL)
110 lp->dev_stats[cpu] =
111 kzalloc(sizeof(struct fcoe_dev_stats),
112 GFP_KERNEL);
113 }
114 write_unlock_bh(&fcoe_hostlist_lock);
115}
116
117/**
118 * fcoe_destroy_percpu_data - destroys the associated cpu data
119 * @cpu: index for the cpu where fcoe cpu data will destroyed
120 *
121 * destroy percpu stats block called by cpu add/remove notifier
122 *
123 * Retuns: none
124 **/
125static void fcoe_destroy_percpu_data(int cpu)
126{
127 struct fc_lport *lp;
128 struct fcoe_softc *fc;
129
130 write_lock_bh(&fcoe_hostlist_lock);
131 list_for_each_entry(fc, &fcoe_hostlist, list) {
132 lp = fc->lp;
133 kfree(lp->dev_stats[cpu]);
134 lp->dev_stats[cpu] = NULL;
135 }
136 write_unlock_bh(&fcoe_hostlist_lock);
137}
138
139/**
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
144 *
145 * this creates or destroys per cpu data for fcoe
146 *
147 * Returns NOTIFY_OK always.
148 **/
149static int fcoe_cpu_callback(struct notifier_block *nfb, unsigned long action,
150 void *hcpu)
151{
152 unsigned int cpu = (unsigned long)hcpu;
153
154 switch (action) {
155 case CPU_ONLINE:
156 fcoe_create_percpu_data(cpu);
157 break;
158 case CPU_DEAD:
159 fcoe_destroy_percpu_data(cpu);
160 break;
161 default:
162 break;
163 }
164 return NOTIFY_OK;
165}
166#endif /* CONFIG_HOTPLUG_CPU */
167
168/**
James Bottomley56b854b2008-12-29 15:45:41 -0600169 * fcoe_rcv - this is the fcoe receive function called by NET_RX_SOFTIRQ
Robert Love85b4aa42008-12-09 15:10:24 -0800170 * @skb: the receive skb
171 * @dev: associated net device
172 * @ptype: context
173 * @odldev: last device
174 *
175 * this function will receive the packet and build fc frame and pass it up
176 *
177 * Returns: 0 for success
178 **/
179int fcoe_rcv(struct sk_buff *skb, struct net_device *dev,
180 struct packet_type *ptype, struct net_device *olddev)
181{
182 struct fc_lport *lp;
183 struct fcoe_rcv_info *fr;
184 struct fcoe_softc *fc;
185 struct fcoe_dev_stats *stats;
186 struct fc_frame_header *fh;
187 unsigned short oxid;
188 int cpu_idx;
189 struct fcoe_percpu_s *fps;
190
191 fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type);
192 lp = fc->lp;
193 if (unlikely(lp == NULL)) {
194 FC_DBG("cannot find hba structure");
195 goto err2;
196 }
197
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>");
204
205 }
206
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");
210 goto err;
211 }
212
213 /*
214 * Check for minimum frame length, and make sure required FCoE
215 * and FC headers are pulled into the linear data area.
216 */
217 if (unlikely((skb->len < FCOE_MIN_FRAME) ||
218 !pskb_may_pull(skb, FCOE_HEADER_LEN)))
219 goto err;
220
221 skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
222 fh = (struct fc_frame_header *) skb_transport_header(skb);
223
224 oxid = ntohs(fh->fh_ox_id);
225
226 fr = fcoe_dev_from_skb(skb);
227 fr->fr_dev = lp;
228 fr->ptype = ptype;
229 cpu_idx = 0;
230#ifdef CONFIG_SMP
231 /*
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.
237 */
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);
241#endif
242 fps = fcoe_percpu[cpu_idx];
243
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);
248
249 spin_unlock_bh(&fps->fcoe_rx_list.lock);
250
251 return 0;
252err:
253#ifdef CONFIG_SMP
254 stats = lp->dev_stats[smp_processor_id()];
255#else
256 stats = lp->dev_stats[0];
257#endif
258 if (stats)
259 stats->ErrorFrames++;
260
261err2:
262 kfree_skb(skb);
263 return -1;
264}
265EXPORT_SYMBOL_GPL(fcoe_rcv);
266
267/**
268 * fcoe_start_io - pass to netdev to start xmit for fcoe
269 * @skb: the skb to be xmitted
270 *
271 * Returns: 0 for success
272 **/
273static inline int fcoe_start_io(struct sk_buff *skb)
274{
275 int rc;
276
277 skb_get(skb);
278 rc = dev_queue_xmit(skb);
279 if (rc != 0)
280 return rc;
281 kfree_skb(skb);
282 return 0;
283}
284
285/**
286 * fcoe_get_paged_crc_eof - in case we need alloc a page for crc_eof
287 * @skb: the skb to be xmitted
288 * @tlen: total len
289 *
290 * Returns: 0 for success
291 **/
292static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
293{
294 struct fcoe_percpu_s *fps;
295 struct page *page;
296 int cpu_idx;
297
298 cpu_idx = get_cpu();
299 fps = fcoe_percpu[cpu_idx];
300 page = fps->crc_eof_page;
301 if (!page) {
302 page = alloc_page(GFP_ATOMIC);
303 if (!page) {
304 put_cpu();
305 return -ENOMEM;
306 }
307 fps->crc_eof_page = page;
308 WARN_ON(fps->crc_eof_offset != 0);
309 }
310
311 get_page(page);
312 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
313 fps->crc_eof_offset, tlen);
314 skb->len += tlen;
315 skb->data_len += tlen;
316 skb->truesize += tlen;
317 fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);
318
319 if (fps->crc_eof_offset >= PAGE_SIZE) {
320 fps->crc_eof_page = NULL;
321 fps->crc_eof_offset = 0;
322 put_page(page);
323 }
324 put_cpu();
325 return 0;
326}
327
328/**
329 * fcoe_fc_crc - calculates FC CRC in this fcoe skb
330 * @fp: the fc_frame containg data to be checksummed
331 *
332 * This uses crc32() to calculate the crc for fc frame
333 * Return : 32 bit crc
334 *
335 **/
336u32 fcoe_fc_crc(struct fc_frame *fp)
337{
338 struct sk_buff *skb = fp_skb(fp);
339 struct skb_frag_struct *frag;
340 unsigned char *data;
341 unsigned long off, len, clen;
342 u32 crc;
343 unsigned i;
344
345 crc = crc32(~0, skb->data, skb_headlen(skb));
346
347 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
348 frag = &skb_shinfo(skb)->frags[i];
349 off = frag->page_offset;
350 len = frag->size;
351 while (len > 0) {
352 clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
353 data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
354 KM_SKB_DATA_SOFTIRQ);
355 crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
356 kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
357 off += clen;
358 len -= clen;
359 }
360 }
361 return crc;
362}
363EXPORT_SYMBOL_GPL(fcoe_fc_crc);
364
365/**
366 * fcoe_xmit - FCoE frame transmit function
367 * @lp: the associated local port
368 * @fp: the fc_frame to be transmitted
369 *
370 * Return : 0 for success
371 *
372 **/
373int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp)
374{
375 int wlen, rc = 0;
376 u32 crc;
377 struct ethhdr *eh;
378 struct fcoe_crc_eof *cp;
379 struct sk_buff *skb;
380 struct fcoe_dev_stats *stats;
381 struct fc_frame_header *fh;
382 unsigned int hlen; /* header length implies the version */
383 unsigned int tlen; /* trailer length */
384 unsigned int elen; /* eth header, may include vlan */
385 int flogi_in_progress = 0;
386 struct fcoe_softc *fc;
387 u8 sof, eof;
388 struct fcoe_hdr *hp;
389
390 WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
391
392 fc = fcoe_softc(lp);
393 /*
394 * if it is a flogi then we need to learn gw-addr
395 * and my own fcid
396 */
397 fh = fc_frame_header_get(fp);
398 if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ)) {
399 if (fc_frame_payload_op(fp) == ELS_FLOGI) {
400 fc->flogi_oxid = ntohs(fh->fh_ox_id);
401 fc->address_mode = FCOE_FCOUI_ADDR_MODE;
402 fc->flogi_progress = 1;
403 flogi_in_progress = 1;
404 } else if (fc->flogi_progress && ntoh24(fh->fh_s_id) != 0) {
405 /*
406 * Here we must've gotten an SID by accepting an FLOGI
407 * from a point-to-point connection. Switch to using
408 * the source mac based on the SID. The destination
409 * MAC in this case would have been set by receving the
410 * FLOGI.
411 */
412 fc_fcoe_set_mac(fc->data_src_addr, fh->fh_s_id);
413 fc->flogi_progress = 0;
414 }
415 }
416
417 skb = fp_skb(fp);
418 sof = fr_sof(fp);
419 eof = fr_eof(fp);
420
421 elen = (fc->real_dev->priv_flags & IFF_802_1Q_VLAN) ?
422 sizeof(struct vlan_ethhdr) : sizeof(struct ethhdr);
423 hlen = sizeof(struct fcoe_hdr);
424 tlen = sizeof(struct fcoe_crc_eof);
425 wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
426
427 /* crc offload */
428 if (likely(lp->crc_offload)) {
429 skb->ip_summed = CHECKSUM_COMPLETE;
430 skb->csum_start = skb_headroom(skb);
431 skb->csum_offset = skb->len;
432 crc = 0;
433 } else {
434 skb->ip_summed = CHECKSUM_NONE;
435 crc = fcoe_fc_crc(fp);
436 }
437
438 /* copy fc crc and eof to the skb buff */
439 if (skb_is_nonlinear(skb)) {
440 skb_frag_t *frag;
441 if (fcoe_get_paged_crc_eof(skb, tlen)) {
442 kfree(skb);
443 return -ENOMEM;
444 }
445 frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
446 cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
447 + frag->page_offset;
448 } else {
449 cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
450 }
451
452 memset(cp, 0, sizeof(*cp));
453 cp->fcoe_eof = eof;
454 cp->fcoe_crc32 = cpu_to_le32(~crc);
455
456 if (skb_is_nonlinear(skb)) {
457 kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ);
458 cp = NULL;
459 }
460
461 /* adjust skb netowrk/transport offsets to match mac/fcoe/fc */
462 skb_push(skb, elen + hlen);
463 skb_reset_mac_header(skb);
464 skb_reset_network_header(skb);
465 skb->mac_len = elen;
466 skb->protocol = htons(ETH_P_802_3);
467 skb->dev = fc->real_dev;
468
469 /* fill up mac and fcoe headers */
470 eh = eth_hdr(skb);
471 eh->h_proto = htons(ETH_P_FCOE);
472 if (fc->address_mode == FCOE_FCOUI_ADDR_MODE)
473 fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id);
474 else
475 /* insert GW address */
476 memcpy(eh->h_dest, fc->dest_addr, ETH_ALEN);
477
478 if (unlikely(flogi_in_progress))
479 memcpy(eh->h_source, fc->ctl_src_addr, ETH_ALEN);
480 else
481 memcpy(eh->h_source, fc->data_src_addr, ETH_ALEN);
482
483 hp = (struct fcoe_hdr *)(eh + 1);
484 memset(hp, 0, sizeof(*hp));
485 if (FC_FCOE_VER)
486 FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
487 hp->fcoe_sof = sof;
488
489 /* update tx stats: regardless if LLD fails */
490 stats = lp->dev_stats[smp_processor_id()];
491 if (stats) {
492 stats->TxFrames++;
493 stats->TxWords += wlen;
494 }
495
496 /* send down to lld */
497 fr_dev(fp) = lp;
498 if (fc->fcoe_pending_queue.qlen)
499 rc = fcoe_check_wait_queue(lp);
500
501 if (rc == 0)
502 rc = fcoe_start_io(skb);
503
504 if (rc) {
505 fcoe_insert_wait_queue(lp, skb);
506 if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
507 fc_pause(lp);
508 }
509
510 return 0;
511}
512EXPORT_SYMBOL_GPL(fcoe_xmit);
513
514/*
515 * fcoe_percpu_receive_thread - recv thread per cpu
516 * @arg: ptr to the fcoe per cpu struct
517 *
518 * Return: 0 for success
519 *
520 */
521int fcoe_percpu_receive_thread(void *arg)
522{
523 struct fcoe_percpu_s *p = arg;
524 u32 fr_len;
525 struct fc_lport *lp;
526 struct fcoe_rcv_info *fr;
527 struct fcoe_dev_stats *stats;
528 struct fc_frame_header *fh;
529 struct sk_buff *skb;
530 struct fcoe_crc_eof crc_eof;
531 struct fc_frame *fp;
532 u8 *mac = NULL;
533 struct fcoe_softc *fc;
534 struct fcoe_hdr *hp;
535
536 set_user_nice(current, 19);
537
538 while (!kthread_should_stop()) {
539
540 spin_lock_bh(&p->fcoe_rx_list.lock);
541 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) {
542 set_current_state(TASK_INTERRUPTIBLE);
543 spin_unlock_bh(&p->fcoe_rx_list.lock);
544 schedule();
545 set_current_state(TASK_RUNNING);
546 if (kthread_should_stop())
547 return 0;
548 spin_lock_bh(&p->fcoe_rx_list.lock);
549 }
550 spin_unlock_bh(&p->fcoe_rx_list.lock);
551 fr = fcoe_dev_from_skb(skb);
552 lp = fr->fr_dev;
553 if (unlikely(lp == NULL)) {
554 FC_DBG("invalid HBA Structure");
555 kfree_skb(skb);
556 continue;
557 }
558
559 stats = lp->dev_stats[smp_processor_id()];
560
561 if (unlikely(debug_fcoe)) {
562 FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p "
563 "tail:%p end:%p sum:%d dev:%s",
564 skb->len, skb->data_len,
565 skb->head, skb->data, skb_tail_pointer(skb),
566 skb_end_pointer(skb), skb->csum,
567 skb->dev ? skb->dev->name : "<NULL>");
568 }
569
570 /*
571 * Save source MAC address before discarding header.
572 */
573 fc = lport_priv(lp);
574 if (unlikely(fc->flogi_progress))
575 mac = eth_hdr(skb)->h_source;
576
577 if (skb_is_nonlinear(skb))
578 skb_linearize(skb); /* not ideal */
579
580 /*
581 * Frame length checks and setting up the header pointers
582 * was done in fcoe_rcv already.
583 */
584 hp = (struct fcoe_hdr *) skb_network_header(skb);
585 fh = (struct fc_frame_header *) skb_transport_header(skb);
586
587 if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
588 if (stats) {
589 if (stats->ErrorFrames < 5)
590 FC_DBG("unknown FCoE version %x",
591 FC_FCOE_DECAPS_VER(hp));
592 stats->ErrorFrames++;
593 }
594 kfree_skb(skb);
595 continue;
596 }
597
598 skb_pull(skb, sizeof(struct fcoe_hdr));
599 fr_len = skb->len - sizeof(struct fcoe_crc_eof);
600
601 if (stats) {
602 stats->RxFrames++;
603 stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
604 }
605
606 fp = (struct fc_frame *)skb;
607 fc_frame_init(fp);
608 fr_dev(fp) = lp;
609 fr_sof(fp) = hp->fcoe_sof;
610
611 /* Copy out the CRC and EOF trailer for access */
612 if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) {
613 kfree_skb(skb);
614 continue;
615 }
616 fr_eof(fp) = crc_eof.fcoe_eof;
617 fr_crc(fp) = crc_eof.fcoe_crc32;
618 if (pskb_trim(skb, fr_len)) {
619 kfree_skb(skb);
620 continue;
621 }
622
623 /*
624 * We only check CRC if no offload is available and if it is
625 * it's solicited data, in which case, the FCP layer would
626 * check it during the copy.
627 */
628 if (lp->crc_offload)
629 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
630 else
631 fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
632
633 fh = fc_frame_header_get(fp);
634 if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA &&
635 fh->fh_type == FC_TYPE_FCP) {
636 fc_exch_recv(lp, lp->emp, fp);
637 continue;
638 }
639 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
640 if (le32_to_cpu(fr_crc(fp)) !=
641 ~crc32(~0, skb->data, fr_len)) {
642 if (debug_fcoe || stats->InvalidCRCCount < 5)
643 printk(KERN_WARNING "fcoe: dropping "
644 "frame with CRC error\n");
645 stats->InvalidCRCCount++;
646 stats->ErrorFrames++;
647 fc_frame_free(fp);
648 continue;
649 }
650 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
651 }
652 /* non flogi and non data exchanges are handled here */
653 if (unlikely(fc->flogi_progress))
654 fcoe_recv_flogi(fc, fp, mac);
655 fc_exch_recv(lp, lp->emp, fp);
656 }
657 return 0;
658}
659
660/**
661 * fcoe_recv_flogi - flogi receive function
662 * @fc: associated fcoe_softc
663 * @fp: the recieved frame
664 * @sa: the source address of this flogi
665 *
666 * This is responsible to parse the flogi response and sets the corresponding
667 * mac address for the initiator, eitehr OUI based or GW based.
668 *
669 * Returns: none
670 **/
671static void fcoe_recv_flogi(struct fcoe_softc *fc, struct fc_frame *fp, u8 *sa)
672{
673 struct fc_frame_header *fh;
674 u8 op;
675
676 fh = fc_frame_header_get(fp);
677 if (fh->fh_type != FC_TYPE_ELS)
678 return;
679 op = fc_frame_payload_op(fp);
680 if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
681 fc->flogi_oxid == ntohs(fh->fh_ox_id)) {
682 /*
683 * FLOGI accepted.
684 * If the src mac addr is FC_OUI-based, then we mark the
685 * address_mode flag to use FC_OUI-based Ethernet DA.
686 * Otherwise we use the FCoE gateway addr
687 */
688 if (!compare_ether_addr(sa, (u8[6]) FC_FCOE_FLOGI_MAC)) {
689 fc->address_mode = FCOE_FCOUI_ADDR_MODE;
690 } else {
691 memcpy(fc->dest_addr, sa, ETH_ALEN);
692 fc->address_mode = FCOE_GW_ADDR_MODE;
693 }
694
695 /*
696 * Remove any previously-set unicast MAC filter.
697 * Add secondary FCoE MAC address filter for our OUI.
698 */
699 rtnl_lock();
700 if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 }))
701 dev_unicast_delete(fc->real_dev, fc->data_src_addr,
702 ETH_ALEN);
703 fc_fcoe_set_mac(fc->data_src_addr, fh->fh_d_id);
704 dev_unicast_add(fc->real_dev, fc->data_src_addr, ETH_ALEN);
705 rtnl_unlock();
706
707 fc->flogi_progress = 0;
708 } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
709 /*
710 * Save source MAC for point-to-point responses.
711 */
712 memcpy(fc->dest_addr, sa, ETH_ALEN);
713 fc->address_mode = FCOE_GW_ADDR_MODE;
714 }
715}
716
717/**
718 * fcoe_watchdog - fcoe timer callback
719 * @vp:
720 *
721 * This checks the pending queue length for fcoe and put fcoe to be paused state
722 * if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the
723 * fcoe_hostlist.
724 *
725 * Returns: 0 for success
726 **/
727void fcoe_watchdog(ulong vp)
728{
729 struct fc_lport *lp;
730 struct fcoe_softc *fc;
731 int paused = 0;
732
733 read_lock(&fcoe_hostlist_lock);
734 list_for_each_entry(fc, &fcoe_hostlist, list) {
735 lp = fc->lp;
736 if (lp) {
737 if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
738 paused = 1;
739 if (fcoe_check_wait_queue(lp) < FCOE_MAX_QUEUE_DEPTH) {
740 if (paused)
741 fc_unpause(lp);
742 }
743 }
744 }
745 read_unlock(&fcoe_hostlist_lock);
746
747 fcoe_timer.expires = jiffies + (1 * HZ);
748 add_timer(&fcoe_timer);
749}
750
751
752/**
753 * fcoe_check_wait_queue - put the skb into fcoe pending xmit queue
754 * @lp: the fc_port for this skb
755 * @skb: the associated skb to be xmitted
756 *
757 * This empties the wait_queue, dequeue the head of the wait_queue queue
758 * and calls fcoe_start_io() for each packet, if all skb have been
759 * transmitted, return 0 if a error occurs, then restore wait_queue and
760 * try again later.
761 *
762 * The wait_queue is used when the skb transmit fails. skb will go
763 * in the wait_queue which will be emptied by the time function OR
764 * by the next skb transmit.
765 *
766 * Returns: 0 for success
767 **/
768static int fcoe_check_wait_queue(struct fc_lport *lp)
769{
770 int rc, unpause = 0;
771 int paused = 0;
772 struct sk_buff *skb;
773 struct fcoe_softc *fc;
774
775 fc = fcoe_softc(lp);
776 spin_lock_bh(&fc->fcoe_pending_queue.lock);
777
778 /*
779 * is this interface paused?
780 */
781 if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
782 paused = 1;
783 if (fc->fcoe_pending_queue.qlen) {
784 while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) {
785 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
786 rc = fcoe_start_io(skb);
787 if (rc) {
788 fcoe_insert_wait_queue_head(lp, skb);
789 return rc;
790 }
791 spin_lock_bh(&fc->fcoe_pending_queue.lock);
792 }
793 if (fc->fcoe_pending_queue.qlen < FCOE_MAX_QUEUE_DEPTH)
794 unpause = 1;
795 }
796 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
797 if ((unpause) && (paused))
798 fc_unpause(lp);
799 return fc->fcoe_pending_queue.qlen;
800}
801
802/**
803 * fcoe_insert_wait_queue_head - puts skb to fcoe pending queue head
804 * @lp: the fc_port for this skb
805 * @skb: the associated skb to be xmitted
806 *
807 * Returns: none
808 **/
809static void fcoe_insert_wait_queue_head(struct fc_lport *lp,
810 struct sk_buff *skb)
811{
812 struct fcoe_softc *fc;
813
814 fc = fcoe_softc(lp);
815 spin_lock_bh(&fc->fcoe_pending_queue.lock);
816 __skb_queue_head(&fc->fcoe_pending_queue, skb);
817 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
818}
819
820/**
821 * fcoe_insert_wait_queue - put the skb into fcoe pending queue tail
822 * @lp: the fc_port for this skb
823 * @skb: the associated skb to be xmitted
824 *
825 * Returns: none
826 **/
827static void fcoe_insert_wait_queue(struct fc_lport *lp,
828 struct sk_buff *skb)
829{
830 struct fcoe_softc *fc;
831
832 fc = fcoe_softc(lp);
833 spin_lock_bh(&fc->fcoe_pending_queue.lock);
834 __skb_queue_tail(&fc->fcoe_pending_queue, skb);
835 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
836}
837
838/**
839 * fcoe_dev_setup - setup link change notification interface
840 *
841 **/
842static void fcoe_dev_setup(void)
843{
844 /*
845 * here setup a interface specific wd time to
846 * monitor the link state
847 */
848 register_netdevice_notifier(&fcoe_notifier);
849}
850
851/**
852 * fcoe_dev_setup - cleanup link change notification interface
853 **/
854static void fcoe_dev_cleanup(void)
855{
856 unregister_netdevice_notifier(&fcoe_notifier);
857}
858
859/**
860 * fcoe_device_notification - netdev event notification callback
861 * @notifier: context of the notification
862 * @event: type of event
863 * @ptr: fixed array for output parsed ifname
864 *
865 * This function is called by the ethernet driver in case of link change event
866 *
867 * Returns: 0 for success
868 **/
869static int fcoe_device_notification(struct notifier_block *notifier,
870 ulong event, void *ptr)
871{
872 struct fc_lport *lp = NULL;
873 struct net_device *real_dev = ptr;
874 struct fcoe_softc *fc;
875 struct fcoe_dev_stats *stats;
876 u16 new_status;
877 u32 mfs;
878 int rc = NOTIFY_OK;
879
880 read_lock(&fcoe_hostlist_lock);
881 list_for_each_entry(fc, &fcoe_hostlist, list) {
882 if (fc->real_dev == real_dev) {
883 lp = fc->lp;
884 break;
885 }
886 }
887 read_unlock(&fcoe_hostlist_lock);
888 if (lp == NULL) {
889 rc = NOTIFY_DONE;
890 goto out;
891 }
892
893 new_status = lp->link_status;
894 switch (event) {
895 case NETDEV_DOWN:
896 case NETDEV_GOING_DOWN:
897 new_status &= ~FC_LINK_UP;
898 break;
899 case NETDEV_UP:
900 case NETDEV_CHANGE:
901 new_status &= ~FC_LINK_UP;
902 if (!fcoe_link_ok(lp))
903 new_status |= FC_LINK_UP;
904 break;
905 case NETDEV_CHANGEMTU:
906 mfs = fc->real_dev->mtu -
907 (sizeof(struct fcoe_hdr) +
908 sizeof(struct fcoe_crc_eof));
909 if (mfs >= FC_MIN_MAX_FRAME)
910 fc_set_mfs(lp, mfs);
911 new_status &= ~FC_LINK_UP;
912 if (!fcoe_link_ok(lp))
913 new_status |= FC_LINK_UP;
914 break;
915 case NETDEV_REGISTER:
916 break;
917 default:
918 FC_DBG("unknown event %ld call", event);
919 }
920 if (lp->link_status != new_status) {
921 if ((new_status & FC_LINK_UP) == FC_LINK_UP)
922 fc_linkup(lp);
923 else {
924 stats = lp->dev_stats[smp_processor_id()];
925 if (stats)
926 stats->LinkFailureCount++;
927 fc_linkdown(lp);
928 fcoe_clean_pending_queue(lp);
929 }
930 }
931out:
932 return rc;
933}
934
935/**
936 * fcoe_if_to_netdev - parse a name buffer to get netdev
937 * @ifname: fixed array for output parsed ifname
938 * @buffer: incoming buffer to be copied
939 *
940 * Returns: NULL or ptr to netdeive
941 **/
942static struct net_device *fcoe_if_to_netdev(const char *buffer)
943{
944 char *cp;
945 char ifname[IFNAMSIZ + 2];
946
947 if (buffer) {
948 strlcpy(ifname, buffer, IFNAMSIZ);
949 cp = ifname + strlen(ifname);
950 while (--cp >= ifname && *cp == '\n')
951 *cp = '\0';
952 return dev_get_by_name(&init_net, ifname);
953 }
954 return NULL;
955}
956
957/**
958 * fcoe_netdev_to_module_owner - finds out the nic drive moddule of the netdev
959 * @netdev: the target netdev
960 *
961 * Returns: ptr to the struct module, NULL for failure
962 **/
963static struct module *fcoe_netdev_to_module_owner(
964 const struct net_device *netdev)
965{
966 struct device *dev;
967
968 if (!netdev)
969 return NULL;
970
971 dev = netdev->dev.parent;
972 if (!dev)
973 return NULL;
974
975 if (!dev->driver)
976 return NULL;
977
978 return dev->driver->owner;
979}
980
981/**
982 * fcoe_ethdrv_get - holds the nic driver module by try_module_get() for
983 * the corresponding netdev.
984 * @netdev: the target netdev
985 *
986 * Returns: 0 for succsss
987 **/
988static int fcoe_ethdrv_get(const struct net_device *netdev)
989{
990 struct module *owner;
991
992 owner = fcoe_netdev_to_module_owner(netdev);
993 if (owner) {
James Bottomley56b854b2008-12-29 15:45:41 -0600994 printk(KERN_DEBUG "fcoe:hold driver module %s for %s\n",
995 module_name(owner), netdev->name);
Robert Love85b4aa42008-12-09 15:10:24 -0800996 return try_module_get(owner);
997 }
998 return -ENODEV;
999}
1000
1001/**
1002 * fcoe_ethdrv_get - releases the nic driver module by module_put for
1003 * the corresponding netdev.
1004 * @netdev: the target netdev
1005 *
1006 * Returns: 0 for succsss
1007 **/
1008static int fcoe_ethdrv_put(const struct net_device *netdev)
1009{
1010 struct module *owner;
1011
1012 owner = fcoe_netdev_to_module_owner(netdev);
1013 if (owner) {
James Bottomley56b854b2008-12-29 15:45:41 -06001014 printk(KERN_DEBUG "fcoe:release driver module %s for %s\n",
1015 module_name(owner), netdev->name);
Robert Love85b4aa42008-12-09 15:10:24 -08001016 module_put(owner);
1017 return 0;
1018 }
1019 return -ENODEV;
1020}
1021
1022/**
1023 * fcoe_destroy- handles the destroy from sysfs
1024 * @buffer: expcted to be a eth if name
1025 * @kp: associated kernel param
1026 *
1027 * Returns: 0 for success
1028 **/
1029static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
1030{
1031 int rc;
1032 struct net_device *netdev;
1033
1034 netdev = fcoe_if_to_netdev(buffer);
1035 if (!netdev) {
1036 rc = -ENODEV;
1037 goto out_nodev;
1038 }
1039 /* look for existing lport */
1040 if (!fcoe_hostlist_lookup(netdev)) {
1041 rc = -ENODEV;
1042 goto out_putdev;
1043 }
1044 /* pass to transport */
1045 rc = fcoe_transport_release(netdev);
1046 if (rc) {
1047 printk(KERN_ERR "fcoe: fcoe_transport_release(%s) failed\n",
1048 netdev->name);
1049 rc = -EIO;
1050 goto out_putdev;
1051 }
1052 fcoe_ethdrv_put(netdev);
1053 rc = 0;
1054out_putdev:
1055 dev_put(netdev);
1056out_nodev:
1057 return rc;
1058}
1059
1060/**
1061 * fcoe_create - handles the create call from sysfs
1062 * @buffer: expcted to be a eth if name
1063 * @kp: associated kernel param
1064 *
1065 * Returns: 0 for success
1066 **/
1067static int fcoe_create(const char *buffer, struct kernel_param *kp)
1068{
1069 int rc;
1070 struct net_device *netdev;
1071
1072 netdev = fcoe_if_to_netdev(buffer);
1073 if (!netdev) {
1074 rc = -ENODEV;
1075 goto out_nodev;
1076 }
1077 /* look for existing lport */
1078 if (fcoe_hostlist_lookup(netdev)) {
1079 rc = -EEXIST;
1080 goto out_putdev;
1081 }
1082 fcoe_ethdrv_get(netdev);
1083
1084 /* pass to transport */
1085 rc = fcoe_transport_attach(netdev);
1086 if (rc) {
1087 printk(KERN_ERR "fcoe: fcoe_transport_attach(%s) failed\n",
1088 netdev->name);
1089 fcoe_ethdrv_put(netdev);
1090 rc = -EIO;
1091 goto out_putdev;
1092 }
1093 rc = 0;
1094out_putdev:
1095 dev_put(netdev);
1096out_nodev:
1097 return rc;
1098}
1099
1100module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR);
1101__MODULE_PARM_TYPE(create, "string");
1102MODULE_PARM_DESC(create, "Create fcoe port using net device passed in.");
1103module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR);
1104__MODULE_PARM_TYPE(destroy, "string");
1105MODULE_PARM_DESC(destroy, "Destroy fcoe port");
1106
1107/*
1108 * fcoe_link_ok - check if link is ok for the fc_lport
1109 * @lp: ptr to the fc_lport
1110 *
1111 * Any permanently-disqualifying conditions have been previously checked.
1112 * This also updates the speed setting, which may change with link for 100/1000.
1113 *
1114 * This function should probably be checking for PAUSE support at some point
1115 * in the future. Currently Per-priority-pause is not determinable using
1116 * ethtool, so we shouldn't be restrictive until that problem is resolved.
1117 *
1118 * Returns: 0 if link is OK for use by FCoE.
1119 *
1120 */
1121int fcoe_link_ok(struct fc_lport *lp)
1122{
1123 struct fcoe_softc *fc = fcoe_softc(lp);
1124 struct net_device *dev = fc->real_dev;
1125 struct ethtool_cmd ecmd = { ETHTOOL_GSET };
1126 int rc = 0;
1127
1128 if ((dev->flags & IFF_UP) && netif_carrier_ok(dev)) {
1129 dev = fc->phys_dev;
1130 if (dev->ethtool_ops->get_settings) {
1131 dev->ethtool_ops->get_settings(dev, &ecmd);
1132 lp->link_supported_speeds &=
1133 ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
1134 if (ecmd.supported & (SUPPORTED_1000baseT_Half |
1135 SUPPORTED_1000baseT_Full))
1136 lp->link_supported_speeds |= FC_PORTSPEED_1GBIT;
1137 if (ecmd.supported & SUPPORTED_10000baseT_Full)
1138 lp->link_supported_speeds |=
1139 FC_PORTSPEED_10GBIT;
1140 if (ecmd.speed == SPEED_1000)
1141 lp->link_speed = FC_PORTSPEED_1GBIT;
1142 if (ecmd.speed == SPEED_10000)
1143 lp->link_speed = FC_PORTSPEED_10GBIT;
1144 }
1145 } else
1146 rc = -1;
1147
1148 return rc;
1149}
1150EXPORT_SYMBOL_GPL(fcoe_link_ok);
1151
1152/*
1153 * fcoe_percpu_clean - frees skb of the corresponding lport from the per
1154 * cpu queue.
1155 * @lp: the fc_lport
1156 */
1157void fcoe_percpu_clean(struct fc_lport *lp)
1158{
1159 int idx;
1160 struct fcoe_percpu_s *pp;
1161 struct fcoe_rcv_info *fr;
1162 struct sk_buff_head *list;
1163 struct sk_buff *skb, *next;
1164 struct sk_buff *head;
1165
1166 for (idx = 0; idx < NR_CPUS; idx++) {
1167 if (fcoe_percpu[idx]) {
1168 pp = fcoe_percpu[idx];
1169 spin_lock_bh(&pp->fcoe_rx_list.lock);
1170 list = &pp->fcoe_rx_list;
1171 head = list->next;
1172 for (skb = head; skb != (struct sk_buff *)list;
1173 skb = next) {
1174 next = skb->next;
1175 fr = fcoe_dev_from_skb(skb);
1176 if (fr->fr_dev == lp) {
1177 __skb_unlink(skb, list);
1178 kfree_skb(skb);
1179 }
1180 }
1181 spin_unlock_bh(&pp->fcoe_rx_list.lock);
1182 }
1183 }
1184}
1185EXPORT_SYMBOL_GPL(fcoe_percpu_clean);
1186
1187/**
1188 * fcoe_clean_pending_queue - dequeue skb and free it
1189 * @lp: the corresponding fc_lport
1190 *
1191 * Returns: none
1192 **/
1193void fcoe_clean_pending_queue(struct fc_lport *lp)
1194{
1195 struct fcoe_softc *fc = lport_priv(lp);
1196 struct sk_buff *skb;
1197
1198 spin_lock_bh(&fc->fcoe_pending_queue.lock);
1199 while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) {
1200 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
1201 kfree_skb(skb);
1202 spin_lock_bh(&fc->fcoe_pending_queue.lock);
1203 }
1204 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
1205}
1206EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue);
1207
1208/**
1209 * libfc_host_alloc - allocate a Scsi_Host with room for the fc_lport
1210 * @sht: ptr to the scsi host templ
1211 * @priv_size: size of private data after fc_lport
1212 *
1213 * Returns: ptr to Scsi_Host
1214 * TODO - to libfc?
1215 */
1216static inline struct Scsi_Host *libfc_host_alloc(
1217 struct scsi_host_template *sht, int priv_size)
1218{
1219 return scsi_host_alloc(sht, sizeof(struct fc_lport) + priv_size);
1220}
1221
1222/**
1223 * fcoe_host_alloc - allocate a Scsi_Host with room for the fcoe_softc
1224 * @sht: ptr to the scsi host templ
1225 * @priv_size: size of private data after fc_lport
1226 *
1227 * Returns: ptr to Scsi_Host
1228 */
1229struct Scsi_Host *fcoe_host_alloc(struct scsi_host_template *sht, int priv_size)
1230{
1231 return libfc_host_alloc(sht, sizeof(struct fcoe_softc) + priv_size);
1232}
1233EXPORT_SYMBOL_GPL(fcoe_host_alloc);
1234
1235/*
1236 * fcoe_reset - resets the fcoe
1237 * @shost: shost the reset is from
1238 *
1239 * Returns: always 0
1240 */
1241int fcoe_reset(struct Scsi_Host *shost)
1242{
1243 struct fc_lport *lport = shost_priv(shost);
1244 fc_lport_reset(lport);
1245 return 0;
1246}
1247EXPORT_SYMBOL_GPL(fcoe_reset);
1248
1249/*
1250 * fcoe_wwn_from_mac - converts 48-bit IEEE MAC address to 64-bit FC WWN.
1251 * @mac: mac address
1252 * @scheme: check port
1253 * @port: port indicator for converting
1254 *
1255 * Returns: u64 fc world wide name
1256 */
1257u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
1258 unsigned int scheme, unsigned int port)
1259{
1260 u64 wwn;
1261 u64 host_mac;
1262
1263 /* The MAC is in NO, so flip only the low 48 bits */
1264 host_mac = ((u64) mac[0] << 40) |
1265 ((u64) mac[1] << 32) |
1266 ((u64) mac[2] << 24) |
1267 ((u64) mac[3] << 16) |
1268 ((u64) mac[4] << 8) |
1269 (u64) mac[5];
1270
1271 WARN_ON(host_mac >= (1ULL << 48));
1272 wwn = host_mac | ((u64) scheme << 60);
1273 switch (scheme) {
1274 case 1:
1275 WARN_ON(port != 0);
1276 break;
1277 case 2:
1278 WARN_ON(port >= 0xfff);
1279 wwn |= (u64) port << 48;
1280 break;
1281 default:
1282 WARN_ON(1);
1283 break;
1284 }
1285
1286 return wwn;
1287}
1288EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
1289/*
1290 * fcoe_hostlist_lookup_softc - find the corresponding lport by a given device
1291 * @device: this is currently ptr to net_device
1292 *
1293 * Returns: NULL or the located fcoe_softc
1294 */
1295static struct fcoe_softc *fcoe_hostlist_lookup_softc(
1296 const struct net_device *dev)
1297{
1298 struct fcoe_softc *fc;
1299
1300 read_lock(&fcoe_hostlist_lock);
1301 list_for_each_entry(fc, &fcoe_hostlist, list) {
1302 if (fc->real_dev == dev) {
1303 read_unlock(&fcoe_hostlist_lock);
1304 return fc;
1305 }
1306 }
1307 read_unlock(&fcoe_hostlist_lock);
1308 return NULL;
1309}
1310
1311/*
1312 * fcoe_hostlist_lookup - find the corresponding lport by netdev
1313 * @netdev: ptr to net_device
1314 *
1315 * Returns: 0 for success
1316 */
1317struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
1318{
1319 struct fcoe_softc *fc;
1320
1321 fc = fcoe_hostlist_lookup_softc(netdev);
1322
1323 return (fc) ? fc->lp : NULL;
1324}
1325EXPORT_SYMBOL_GPL(fcoe_hostlist_lookup);
1326
1327/*
1328 * fcoe_hostlist_add - add a lport to lports list
1329 * @lp: ptr to the fc_lport to badded
1330 *
1331 * Returns: 0 for success
1332 */
1333int fcoe_hostlist_add(const struct fc_lport *lp)
1334{
1335 struct fcoe_softc *fc;
1336
1337 fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
1338 if (!fc) {
1339 fc = fcoe_softc(lp);
1340 write_lock_bh(&fcoe_hostlist_lock);
1341 list_add_tail(&fc->list, &fcoe_hostlist);
1342 write_unlock_bh(&fcoe_hostlist_lock);
1343 }
1344 return 0;
1345}
1346EXPORT_SYMBOL_GPL(fcoe_hostlist_add);
1347
1348/*
1349 * fcoe_hostlist_remove - remove a lport from lports list
1350 * @lp: ptr to the fc_lport to badded
1351 *
1352 * Returns: 0 for success
1353 */
1354int fcoe_hostlist_remove(const struct fc_lport *lp)
1355{
1356 struct fcoe_softc *fc;
1357
1358 fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
1359 BUG_ON(!fc);
1360 write_lock_bh(&fcoe_hostlist_lock);
1361 list_del(&fc->list);
1362 write_unlock_bh(&fcoe_hostlist_lock);
1363
1364 return 0;
1365}
1366EXPORT_SYMBOL_GPL(fcoe_hostlist_remove);
1367
1368/**
1369 * fcoe_libfc_config - sets up libfc related properties for lport
1370 * @lp: ptr to the fc_lport
1371 * @tt: libfc function template
1372 *
1373 * Returns : 0 for success
1374 **/
1375int fcoe_libfc_config(struct fc_lport *lp, struct libfc_function_template *tt)
1376{
1377 /* Set the function pointers set by the LLDD */
1378 memcpy(&lp->tt, tt, sizeof(*tt));
1379 if (fc_fcp_init(lp))
1380 return -ENOMEM;
1381 fc_exch_init(lp);
1382 fc_elsct_init(lp);
1383 fc_lport_init(lp);
1384 fc_rport_init(lp);
1385 fc_disc_init(lp);
1386
1387 return 0;
1388}
1389EXPORT_SYMBOL_GPL(fcoe_libfc_config);
1390
1391/**
1392 * fcoe_init - fcoe module loading initialization
1393 *
1394 * Initialization routine
1395 * 1. Will create fc transport software structure
1396 * 2. initialize the link list of port information structure
1397 *
1398 * Returns 0 on success, negative on failure
1399 **/
1400static int __init fcoe_init(void)
1401{
1402 int cpu;
1403 struct fcoe_percpu_s *p;
1404
1405
1406 INIT_LIST_HEAD(&fcoe_hostlist);
1407 rwlock_init(&fcoe_hostlist_lock);
1408
1409#ifdef CONFIG_HOTPLUG_CPU
1410 register_cpu_notifier(&fcoe_cpu_notifier);
1411#endif /* CONFIG_HOTPLUG_CPU */
1412
1413 /*
1414 * initialize per CPU interrupt thread
1415 */
1416 for_each_online_cpu(cpu) {
1417 p = kzalloc(sizeof(struct fcoe_percpu_s), GFP_KERNEL);
1418 if (p) {
1419 p->thread = kthread_create(fcoe_percpu_receive_thread,
1420 (void *)p,
1421 "fcoethread/%d", cpu);
1422
1423 /*
1424 * if there is no error then bind the thread to the cpu
1425 * initialize the semaphore and skb queue head
1426 */
1427 if (likely(!IS_ERR(p->thread))) {
1428 p->cpu = cpu;
1429 fcoe_percpu[cpu] = p;
1430 skb_queue_head_init(&p->fcoe_rx_list);
1431 kthread_bind(p->thread, cpu);
1432 wake_up_process(p->thread);
1433 } else {
1434 fcoe_percpu[cpu] = NULL;
1435 kfree(p);
1436
1437 }
1438 }
1439 }
1440
1441 /*
1442 * setup link change notification
1443 */
1444 fcoe_dev_setup();
1445
1446 init_timer(&fcoe_timer);
1447 fcoe_timer.data = 0;
1448 fcoe_timer.function = fcoe_watchdog;
1449 fcoe_timer.expires = (jiffies + (10 * HZ));
1450 add_timer(&fcoe_timer);
1451
1452 /* initiatlize the fcoe transport */
1453 fcoe_transport_init();
1454
1455 fcoe_sw_init();
1456
1457 return 0;
1458}
1459module_init(fcoe_init);
1460
1461/**
1462 * fcoe_exit - fcoe module unloading cleanup
1463 *
1464 * Returns 0 on success, negative on failure
1465 **/
1466static void __exit fcoe_exit(void)
1467{
1468 u32 idx;
1469 struct fcoe_softc *fc, *tmp;
1470 struct fcoe_percpu_s *p;
1471 struct sk_buff *skb;
1472
1473 /*
1474 * Stop all call back interfaces
1475 */
1476#ifdef CONFIG_HOTPLUG_CPU
1477 unregister_cpu_notifier(&fcoe_cpu_notifier);
1478#endif /* CONFIG_HOTPLUG_CPU */
1479 fcoe_dev_cleanup();
1480
1481 /*
1482 * stop timer
1483 */
1484 del_timer_sync(&fcoe_timer);
1485
1486 /* releases the assocaited fcoe transport for each lport */
1487 list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list)
1488 fcoe_transport_release(fc->real_dev);
1489
1490 for (idx = 0; idx < NR_CPUS; idx++) {
1491 if (fcoe_percpu[idx]) {
1492 kthread_stop(fcoe_percpu[idx]->thread);
1493 p = fcoe_percpu[idx];
1494 spin_lock_bh(&p->fcoe_rx_list.lock);
1495 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1496 kfree_skb(skb);
1497 spin_unlock_bh(&p->fcoe_rx_list.lock);
1498 if (fcoe_percpu[idx]->crc_eof_page)
1499 put_page(fcoe_percpu[idx]->crc_eof_page);
1500 kfree(fcoe_percpu[idx]);
1501 }
1502 }
1503
1504 /* remove sw trasnport */
1505 fcoe_sw_exit();
1506
1507 /* detach the transport */
1508 fcoe_transport_exit();
1509}
1510module_exit(fcoe_exit);