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printf: Remove unused 'bprintf'
[drm/drm-misc.git] / drivers / block / aoe / aoecmd.c
blob92b06d1de4cc7b7c4ea6f5fad6aa6c4518c1001b
1 /* Copyright (c) 2013 Coraid, Inc. See COPYING for GPL terms. */
2 /*
3 * aoecmd.c
4 * Filesystem request handling methods
5 */
6
7 #include <linux/ata.h>
8 #include <linux/slab.h>
9 #include <linux/hdreg.h>
10 #include <linux/blk-mq.h>
11 #include <linux/skbuff.h>
12 #include <linux/netdevice.h>
13 #include <linux/moduleparam.h>
14 #include <linux/workqueue.h>
15 #include <linux/kthread.h>
16 #include <net/net_namespace.h>
17 #include <linux/unaligned.h>
18 #include <linux/uio.h>
19 #include "aoe.h"
20
21 #define MAXIOC (8192) /* default meant to avoid most soft lockups */
22
23 static void ktcomplete(struct frame *, struct sk_buff *);
24 static int count_targets(struct aoedev *d, int *untainted);
25
26 static struct buf *nextbuf(struct aoedev *);
27
28 static int aoe_deadsecs = 60 * 3;
29 module_param(aoe_deadsecs, int, 0644);
30 MODULE_PARM_DESC(aoe_deadsecs, "After aoe_deadsecs seconds, give up and fail dev.");
31
32 static int aoe_maxout = 64;
33 module_param(aoe_maxout, int, 0644);
34 MODULE_PARM_DESC(aoe_maxout,
35 "Only aoe_maxout outstanding packets for every MAC on eX.Y.");
36
37 /* The number of online cpus during module initialization gives us a
38 * convenient heuristic cap on the parallelism used for ktio threads
39 * doing I/O completion. It is not important that the cap equal the
40 * actual number of running CPUs at any given time, but because of CPU
41 * hotplug, we take care to use ncpus instead of using
42 * num_online_cpus() after module initialization.
43 */
44 static int ncpus;
45
46 /* mutex lock used for synchronization while thread spawning */
47 static DEFINE_MUTEX(ktio_spawn_lock);
48
49 static wait_queue_head_t *ktiowq;
50 static struct ktstate *kts;
51
52 /* io completion queue */
53 struct iocq_ktio {
54 struct list_head head;
55 spinlock_t lock;
56 };
57 static struct iocq_ktio *iocq;
58
59 static struct page *empty_page;
60
61 static struct sk_buff *
62 new_skb(ulong len)
63 {
64 struct sk_buff *skb;
65
66 skb = alloc_skb(len + MAX_HEADER, GFP_ATOMIC);
67 if (skb) {
68 skb_reserve(skb, MAX_HEADER);
69 skb_reset_mac_header(skb);
70 skb_reset_network_header(skb);
71 skb->protocol = __constant_htons(ETH_P_AOE);
72 skb_checksum_none_assert(skb);
73 }
74 return skb;
75 }
76
77 static struct frame *
78 getframe_deferred(struct aoedev *d, u32 tag)
79 {
80 struct list_head *head, *pos, *nx;
81 struct frame *f;
82
83 head = &d->rexmitq;
84 list_for_each_safe(pos, nx, head) {
85 f = list_entry(pos, struct frame, head);
86 if (f->tag == tag) {
87 list_del(pos);
88 return f;
89 }
90 }
91 return NULL;
92 }
93
94 static struct frame *
95 getframe(struct aoedev *d, u32 tag)
96 {
97 struct frame *f;
98 struct list_head *head, *pos, *nx;
99 u32 n;
100
101 n = tag % NFACTIVE;
102 head = &d->factive[n];
103 list_for_each_safe(pos, nx, head) {
104 f = list_entry(pos, struct frame, head);
105 if (f->tag == tag) {
106 list_del(pos);
107 return f;
108 }
109 }
110 return NULL;
111 }
112
113 /*
114 * Leave the top bit clear so we have tagspace for userland.
115 * The bottom 16 bits are the xmit tick for rexmit/rttavg processing.
116 * This driver reserves tag -1 to mean "unused frame."
117 */
118 static int
119 newtag(struct aoedev *d)
120 {
121 register ulong n;
122
123 n = jiffies & 0xffff;
124 return n | (++d->lasttag & 0x7fff) << 16;
125 }
126
127 static u32
128 aoehdr_atainit(struct aoedev *d, struct aoetgt *t, struct aoe_hdr *h)
129 {
130 u32 host_tag = newtag(d);
131
132 memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src);
133 memcpy(h->dst, t->addr, sizeof h->dst);
134 h->type = __constant_cpu_to_be16(ETH_P_AOE);
135 h->verfl = AOE_HVER;
136 h->major = cpu_to_be16(d->aoemajor);
137 h->minor = d->aoeminor;
138 h->cmd = AOECMD_ATA;
139 h->tag = cpu_to_be32(host_tag);
140
141 return host_tag;
142 }
143
144 static inline void
145 put_lba(struct aoe_atahdr *ah, sector_t lba)
146 {
147 ah->lba0 = lba;
148 ah->lba1 = lba >>= 8;
149 ah->lba2 = lba >>= 8;
150 ah->lba3 = lba >>= 8;
151 ah->lba4 = lba >>= 8;
152 ah->lba5 = lba >>= 8;
153 }
154
155 static struct aoeif *
156 ifrotate(struct aoetgt *t)
157 {
158 struct aoeif *ifp;
159
160 ifp = t->ifp;
161 ifp++;
162 if (ifp >= &t->ifs[NAOEIFS] || ifp->nd == NULL)
163 ifp = t->ifs;
164 if (ifp->nd == NULL)
165 return NULL;
166 return t->ifp = ifp;
167 }
168
169 static void
170 skb_pool_put(struct aoedev *d, struct sk_buff *skb)
171 {
172 __skb_queue_tail(&d->skbpool, skb);
173 }
174
175 static struct sk_buff *
176 skb_pool_get(struct aoedev *d)
177 {
178 struct sk_buff *skb = skb_peek(&d->skbpool);
179
180 if (skb && atomic_read(&skb_shinfo(skb)->dataref) == 1) {
181 __skb_unlink(skb, &d->skbpool);
182 return skb;
183 }
184 if (skb_queue_len(&d->skbpool) < NSKBPOOLMAX &&
185 (skb = new_skb(ETH_ZLEN)))
186 return skb;
187
188 return NULL;
189 }
190
191 void
192 aoe_freetframe(struct frame *f)
193 {
194 struct aoetgt *t;
195
196 t = f->t;
197 f->buf = NULL;
198 memset(&f->iter, 0, sizeof(f->iter));
199 f->r_skb = NULL;
200 f->flags = 0;
201 list_add(&f->head, &t->ffree);
202 }
203
204 static struct frame *
205 newtframe(struct aoedev *d, struct aoetgt *t)
206 {
207 struct frame *f;
208 struct sk_buff *skb;
209 struct list_head *pos;
210
211 if (list_empty(&t->ffree)) {
212 if (t->falloc >= NSKBPOOLMAX*2)
213 return NULL;
214 f = kcalloc(1, sizeof(*f), GFP_ATOMIC);
215 if (f == NULL)
216 return NULL;
217 t->falloc++;
218 f->t = t;
219 } else {
220 pos = t->ffree.next;
221 list_del(pos);
222 f = list_entry(pos, struct frame, head);
223 }
224
225 skb = f->skb;
226 if (skb == NULL) {
227 f->skb = skb = new_skb(ETH_ZLEN);
228 if (!skb) {
229 bail: aoe_freetframe(f);
230 return NULL;
231 }
232 }
233
234 if (atomic_read(&skb_shinfo(skb)->dataref) != 1) {
235 skb = skb_pool_get(d);
236 if (skb == NULL)
237 goto bail;
238 skb_pool_put(d, f->skb);
239 f->skb = skb;
240 }
241
242 skb->truesize -= skb->data_len;
243 skb_shinfo(skb)->nr_frags = skb->data_len = 0;
244 skb_trim(skb, 0);
245 return f;
246 }
247
248 static struct frame *
249 newframe(struct aoedev *d)
250 {
251 struct frame *f;
252 struct aoetgt *t, **tt;
253 int totout = 0;
254 int use_tainted;
255 int has_untainted;
256
257 if (!d->targets || !d->targets[0]) {
258 printk(KERN_ERR "aoe: NULL TARGETS!\n");
259 return NULL;
260 }
261 tt = d->tgt; /* last used target */
262 for (use_tainted = 0, has_untainted = 0;;) {
263 tt++;
264 if (tt >= &d->targets[d->ntargets] || !*tt)
265 tt = d->targets;
266 t = *tt;
267 if (!t->taint) {
268 has_untainted = 1;
269 totout += t->nout;
270 }
271 if (t->nout < t->maxout
272 && (use_tainted || !t->taint)
273 && t->ifp->nd) {
274 f = newtframe(d, t);
275 if (f) {
276 ifrotate(t);
277 d->tgt = tt;
278 return f;
279 }
280 }
281 if (tt == d->tgt) { /* we've looped and found nada */
282 if (!use_tainted && !has_untainted)
283 use_tainted = 1;
284 else
285 break;
286 }
287 }
288 if (totout == 0) {
289 d->kicked++;
290 d->flags |= DEVFL_KICKME;
291 }
292 return NULL;
293 }
294
295 static void
296 skb_fillup(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter)
297 {
298 int frag = 0;
299 struct bio_vec bv;
300
301 __bio_for_each_segment(bv, bio, iter, iter)
302 skb_fill_page_desc(skb, frag++, bv.bv_page,
303 bv.bv_offset, bv.bv_len);
304 }
305
306 static void
307 fhash(struct frame *f)
308 {
309 struct aoedev *d = f->t->d;
310 u32 n;
311
312 n = f->tag % NFACTIVE;
313 list_add_tail(&f->head, &d->factive[n]);
314 }
315
316 static void
317 ata_rw_frameinit(struct frame *f)
318 {
319 struct aoetgt *t;
320 struct aoe_hdr *h;
321 struct aoe_atahdr *ah;
322 struct sk_buff *skb;
323 char writebit, extbit;
324
325 skb = f->skb;
326 h = (struct aoe_hdr *) skb_mac_header(skb);
327 ah = (struct aoe_atahdr *) (h + 1);
328 skb_put(skb, sizeof(*h) + sizeof(*ah));
329 memset(h, 0, skb->len);
330
331 writebit = 0x10;
332 extbit = 0x4;
333
334 t = f->t;
335 f->tag = aoehdr_atainit(t->d, t, h);
336 fhash(f);
337 t->nout++;
338 f->waited = 0;
339 f->waited_total = 0;
340
341 /* set up ata header */
342 ah->scnt = f->iter.bi_size >> 9;
343 put_lba(ah, f->iter.bi_sector);
344 if (t->d->flags & DEVFL_EXT) {
345 ah->aflags |= AOEAFL_EXT;
346 } else {
347 extbit = 0;
348 ah->lba3 &= 0x0f;
349 ah->lba3 |= 0xe0; /* LBA bit + obsolete 0xa0 */
350 }
351 if (f->buf && bio_data_dir(f->buf->bio) == WRITE) {
352 skb_fillup(skb, f->buf->bio, f->iter);
353 ah->aflags |= AOEAFL_WRITE;
354 skb->len += f->iter.bi_size;
355 skb->data_len = f->iter.bi_size;
356 skb->truesize += f->iter.bi_size;
357 t->wpkts++;
358 } else {
359 t->rpkts++;
360 writebit = 0;
361 }
362
363 ah->cmdstat = ATA_CMD_PIO_READ | writebit | extbit;
364 dev_hold(t->ifp->nd);
365 skb->dev = t->ifp->nd;
366 }
367
368 static int
369 aoecmd_ata_rw(struct aoedev *d)
370 {
371 struct frame *f;
372 struct buf *buf;
373 struct sk_buff *skb;
374 struct sk_buff_head queue;
375
376 buf = nextbuf(d);
377 if (buf == NULL)
378 return 0;
379 f = newframe(d);
380 if (f == NULL)
381 return 0;
382
383 /* initialize the headers & frame */
384 f->buf = buf;
385 f->iter = buf->iter;
386 f->iter.bi_size = min_t(unsigned long,
387 d->maxbcnt ?: DEFAULTBCNT,
388 f->iter.bi_size);
389 bio_advance_iter(buf->bio, &buf->iter, f->iter.bi_size);
390
391 if (!buf->iter.bi_size)
392 d->ip.buf = NULL;
393
394 /* mark all tracking fields and load out */
395 buf->nframesout += 1;
396
397 ata_rw_frameinit(f);
398
399 skb = skb_clone(f->skb, GFP_ATOMIC);
400 if (skb) {
401 f->sent = ktime_get();
402 __skb_queue_head_init(&queue);
403 __skb_queue_tail(&queue, skb);
404 aoenet_xmit(&queue);
405 } else {
406 dev_put(f->t->ifp->nd);
407 }
408 return 1;
409 }
410
411 /* some callers cannot sleep, and they can call this function,
412 * transmitting the packets later, when interrupts are on
413 */
414 static void
415 aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff_head *queue)
416 {
417 struct aoe_hdr *h;
418 struct aoe_cfghdr *ch;
419 struct sk_buff *skb;
420 struct net_device *ifp;
421
422 rcu_read_lock();
423 for_each_netdev_rcu(&init_net, ifp) {
424 dev_hold(ifp);
425 if (!is_aoe_netif(ifp)) {
426 dev_put(ifp);
427 continue;
428 }
429
430 skb = new_skb(sizeof *h + sizeof *ch);
431 if (skb == NULL) {
432 printk(KERN_INFO "aoe: skb alloc failure\n");
433 dev_put(ifp);
434 continue;
435 }
436 skb_put(skb, sizeof *h + sizeof *ch);
437 skb->dev = ifp;
438 __skb_queue_tail(queue, skb);
439 h = (struct aoe_hdr *) skb_mac_header(skb);
440 memset(h, 0, sizeof *h + sizeof *ch);
441
442 memset(h->dst, 0xff, sizeof h->dst);
443 memcpy(h->src, ifp->dev_addr, sizeof h->src);
444 h->type = __constant_cpu_to_be16(ETH_P_AOE);
445 h->verfl = AOE_HVER;
446 h->major = cpu_to_be16(aoemajor);
447 h->minor = aoeminor;
448 h->cmd = AOECMD_CFG;
449 }
450 rcu_read_unlock();
451 }
452
453 static void
454 resend(struct aoedev *d, struct frame *f)
455 {
456 struct sk_buff *skb;
457 struct sk_buff_head queue;
458 struct aoe_hdr *h;
459 struct aoetgt *t;
460 char buf[128];
461 u32 n;
462
463 t = f->t;
464 n = newtag(d);
465 skb = f->skb;
466 if (ifrotate(t) == NULL) {
467 /* probably can't happen, but set it up to fail anyway */
468 pr_info("aoe: resend: no interfaces to rotate to.\n");
469 ktcomplete(f, NULL);
470 return;
471 }
472 h = (struct aoe_hdr *) skb_mac_header(skb);
473
474 if (!(f->flags & FFL_PROBE)) {
475 snprintf(buf, sizeof(buf),
476 "%15s e%ld.%d oldtag=%08x@%08lx newtag=%08x s=%pm d=%pm nout=%d\n",
477 "retransmit", d->aoemajor, d->aoeminor,
478 f->tag, jiffies, n,
479 h->src, h->dst, t->nout);
480 aoechr_error(buf);
481 }
482
483 f->tag = n;
484 fhash(f);
485 h->tag = cpu_to_be32(n);
486 memcpy(h->dst, t->addr, sizeof h->dst);
487 memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src);
488
489 dev_hold(t->ifp->nd);
490 skb->dev = t->ifp->nd;
491 skb = skb_clone(skb, GFP_ATOMIC);
492 if (skb == NULL) {
493 dev_put(t->ifp->nd);
494 return;
495 }
496 f->sent = ktime_get();
497 __skb_queue_head_init(&queue);
498 __skb_queue_tail(&queue, skb);
499 aoenet_xmit(&queue);
500 }
501
502 static int
503 tsince_hr(struct frame *f)
504 {
505 u64 delta = ktime_to_ns(ktime_sub(ktime_get(), f->sent));
506
507 /* delta is normally under 4.2 seconds, avoid 64-bit division */
508 if (likely(delta <= UINT_MAX))
509 return (u32)delta / NSEC_PER_USEC;
510
511 /* avoid overflow after 71 minutes */
512 if (delta > ((u64)INT_MAX * NSEC_PER_USEC))
513 return INT_MAX;
514
515 return div_u64(delta, NSEC_PER_USEC);
516 }
517
518 static int
519 tsince(u32 tag)
520 {
521 int n;
522
523 n = jiffies & 0xffff;
524 n -= tag & 0xffff;
525 if (n < 0)
526 n += 1<<16;
527 return jiffies_to_usecs(n + 1);
528 }
529
530 static struct aoeif *
531 getif(struct aoetgt *t, struct net_device *nd)
532 {
533 struct aoeif *p, *e;
534
535 p = t->ifs;
536 e = p + NAOEIFS;
537 for (; p < e; p++)
538 if (p->nd == nd)
539 return p;
540 return NULL;
541 }
542
543 static void
544 ejectif(struct aoetgt *t, struct aoeif *ifp)
545 {
546 struct aoeif *e;
547 struct net_device *nd;
548 ulong n;
549
550 nd = ifp->nd;
551 e = t->ifs + NAOEIFS - 1;
552 n = (e - ifp) * sizeof *ifp;
553 memmove(ifp, ifp+1, n);
554 e->nd = NULL;
555 dev_put(nd);
556 }
557
558 static struct frame *
559 reassign_frame(struct frame *f)
560 {
561 struct frame *nf;
562 struct sk_buff *skb;
563
564 nf = newframe(f->t->d);
565 if (!nf)
566 return NULL;
567 if (nf->t == f->t) {
568 aoe_freetframe(nf);
569 return NULL;
570 }
571
572 skb = nf->skb;
573 nf->skb = f->skb;
574 nf->buf = f->buf;
575 nf->iter = f->iter;
576 nf->waited = 0;
577 nf->waited_total = f->waited_total;
578 nf->sent = f->sent;
579 f->skb = skb;
580
581 return nf;
582 }
583
584 static void
585 probe(struct aoetgt *t)
586 {
587 struct aoedev *d;
588 struct frame *f;
589 struct sk_buff *skb;
590 struct sk_buff_head queue;
591 size_t n, m;
592 int frag;
593
594 d = t->d;
595 f = newtframe(d, t);
596 if (!f) {
597 pr_err("%s %pm for e%ld.%d: %s\n",
598 "aoe: cannot probe remote address",
599 t->addr,
600 (long) d->aoemajor, d->aoeminor,
601 "no frame available");
602 return;
603 }
604 f->flags |= FFL_PROBE;
605 ifrotate(t);
606 f->iter.bi_size = t->d->maxbcnt ? t->d->maxbcnt : DEFAULTBCNT;
607 ata_rw_frameinit(f);
608 skb = f->skb;
609 for (frag = 0, n = f->iter.bi_size; n > 0; ++frag, n -= m) {
610 if (n < PAGE_SIZE)
611 m = n;
612 else
613 m = PAGE_SIZE;
614 skb_fill_page_desc(skb, frag, empty_page, 0, m);
615 }
616 skb->len += f->iter.bi_size;
617 skb->data_len = f->iter.bi_size;
618 skb->truesize += f->iter.bi_size;
619
620 skb = skb_clone(f->skb, GFP_ATOMIC);
621 if (skb) {
622 f->sent = ktime_get();
623 __skb_queue_head_init(&queue);
624 __skb_queue_tail(&queue, skb);
625 aoenet_xmit(&queue);
626 } else {
627 dev_put(f->t->ifp->nd);
628 }
629 }
630
631 static long
632 rto(struct aoedev *d)
633 {
634 long t;
635
636 t = 2 * d->rttavg >> RTTSCALE;
637 t += 8 * d->rttdev >> RTTDSCALE;
638 if (t == 0)
639 t = 1;
640
641 return t;
642 }
643
644 static void
645 rexmit_deferred(struct aoedev *d)
646 {
647 struct aoetgt *t;
648 struct frame *f;
649 struct frame *nf;
650 struct list_head *pos, *nx, *head;
651 int since;
652 int untainted;
653
654 count_targets(d, &untainted);
655
656 head = &d->rexmitq;
657 list_for_each_safe(pos, nx, head) {
658 f = list_entry(pos, struct frame, head);
659 t = f->t;
660 if (t->taint) {
661 if (!(f->flags & FFL_PROBE)) {
662 nf = reassign_frame(f);
663 if (nf) {
664 if (t->nout_probes == 0
665 && untainted > 0) {
666 probe(t);
667 t->nout_probes++;
668 }
669 list_replace(&f->head, &nf->head);
670 pos = &nf->head;
671 aoe_freetframe(f);
672 f = nf;
673 t = f->t;
674 }
675 } else if (untainted < 1) {
676 /* don't probe w/o other untainted aoetgts */
677 goto stop_probe;
678 } else if (tsince_hr(f) < t->taint * rto(d)) {
679 /* reprobe slowly when taint is high */
680 continue;
681 }
682 } else if (f->flags & FFL_PROBE) {
683 stop_probe: /* don't probe untainted aoetgts */
684 list_del(pos);
685 aoe_freetframe(f);
686 /* leaving d->kicked, because this is routine */
687 f->t->d->flags |= DEVFL_KICKME;
688 continue;
689 }
690 if (t->nout >= t->maxout)
691 continue;
692 list_del(pos);
693 t->nout++;
694 if (f->flags & FFL_PROBE)
695 t->nout_probes++;
696 since = tsince_hr(f);
697 f->waited += since;
698 f->waited_total += since;
699 resend(d, f);
700 }
701 }
702
703 /* An aoetgt accumulates demerits quickly, and successful
704 * probing redeems the aoetgt slowly.
705 */
706 static void
707 scorn(struct aoetgt *t)
708 {
709 int n;
710
711 n = t->taint++;
712 t->taint += t->taint * 2;
713 if (n > t->taint)
714 t->taint = n;
715 if (t->taint > MAX_TAINT)
716 t->taint = MAX_TAINT;
717 }
718
719 static int
720 count_targets(struct aoedev *d, int *untainted)
721 {
722 int i, good;
723
724 for (i = good = 0; i < d->ntargets && d->targets[i]; ++i)
725 if (d->targets[i]->taint == 0)
726 good++;
727
728 if (untainted)
729 *untainted = good;
730 return i;
731 }
732
733 static void
734 rexmit_timer(struct timer_list *timer)
735 {
736 struct aoedev *d;
737 struct aoetgt *t;
738 struct aoeif *ifp;
739 struct frame *f;
740 struct list_head *head, *pos, *nx;
741 LIST_HEAD(flist);
742 register long timeout;
743 ulong flags, n;
744 int i;
745 int utgts; /* number of aoetgt descriptors (not slots) */
746 int since;
747
748 d = from_timer(d, timer, timer);
749
750 spin_lock_irqsave(&d->lock, flags);
751
752 /* timeout based on observed timings and variations */
753 timeout = rto(d);
754
755 utgts = count_targets(d, NULL);
756
757 if (d->flags & DEVFL_TKILL) {
758 spin_unlock_irqrestore(&d->lock, flags);
759 return;
760 }
761
762 /* collect all frames to rexmit into flist */
763 for (i = 0; i < NFACTIVE; i++) {
764 head = &d->factive[i];
765 list_for_each_safe(pos, nx, head) {
766 f = list_entry(pos, struct frame, head);
767 if (tsince_hr(f) < timeout)
768 break; /* end of expired frames */
769 /* move to flist for later processing */
770 list_move_tail(pos, &flist);
771 }
772 }
773
774 /* process expired frames */
775 while (!list_empty(&flist)) {
776 pos = flist.next;
777 f = list_entry(pos, struct frame, head);
778 since = tsince_hr(f);
779 n = f->waited_total + since;
780 n /= USEC_PER_SEC;
781 if (aoe_deadsecs
782 && n > aoe_deadsecs
783 && !(f->flags & FFL_PROBE)) {
784 /* Waited too long. Device failure.
785 * Hang all frames on first hash bucket for downdev
786 * to clean up.
787 */
788 list_splice(&flist, &d->factive[0]);
789 aoedev_downdev(d);
790 goto out;
791 }
792
793 t = f->t;
794 n = f->waited + since;
795 n /= USEC_PER_SEC;
796 if (aoe_deadsecs && utgts > 0
797 && (n > aoe_deadsecs / utgts || n > HARD_SCORN_SECS))
798 scorn(t); /* avoid this target */
799
800 if (t->maxout != 1) {
801 t->ssthresh = t->maxout / 2;
802 t->maxout = 1;
803 }
804
805 if (f->flags & FFL_PROBE) {
806 t->nout_probes--;
807 } else {
808 ifp = getif(t, f->skb->dev);
809 if (ifp && ++ifp->lost > (t->nframes << 1)
810 && (ifp != t->ifs || t->ifs[1].nd)) {
811 ejectif(t, ifp);
812 ifp = NULL;
813 }
814 }
815 list_move_tail(pos, &d->rexmitq);
816 t->nout--;
817 }
818 rexmit_deferred(d);
819
820 out:
821 if ((d->flags & DEVFL_KICKME) && d->blkq) {
822 d->flags &= ~DEVFL_KICKME;
823 blk_mq_run_hw_queues(d->blkq, true);
824 }
825
826 d->timer.expires = jiffies + TIMERTICK;
827 add_timer(&d->timer);
828
829 spin_unlock_irqrestore(&d->lock, flags);
830 }
831
832 static void
833 bufinit(struct buf *buf, struct request *rq, struct bio *bio)
834 {
835 memset(buf, 0, sizeof(*buf));
836 buf->rq = rq;
837 buf->bio = bio;
838 buf->iter = bio->bi_iter;
839 }
840
841 static struct buf *
842 nextbuf(struct aoedev *d)
843 {
844 struct request *rq;
845 struct request_queue *q;
846 struct aoe_req *req;
847 struct buf *buf;
848 struct bio *bio;
849
850 q = d->blkq;
851 if (q == NULL)
852 return NULL; /* initializing */
853 if (d->ip.buf)
854 return d->ip.buf;
855 rq = d->ip.rq;
856 if (rq == NULL) {
857 rq = list_first_entry_or_null(&d->rq_list, struct request,
858 queuelist);
859 if (rq == NULL)
860 return NULL;
861 list_del_init(&rq->queuelist);
862 blk_mq_start_request(rq);
863 d->ip.rq = rq;
864 d->ip.nxbio = rq->bio;
865
866 req = blk_mq_rq_to_pdu(rq);
867 req->nr_bios = 0;
868 __rq_for_each_bio(bio, rq)
869 req->nr_bios++;
870 }
871 buf = mempool_alloc(d->bufpool, GFP_ATOMIC);
872 if (buf == NULL) {
873 pr_err("aoe: nextbuf: unable to mempool_alloc!\n");
874 return NULL;
875 }
876 bio = d->ip.nxbio;
877 bufinit(buf, rq, bio);
878 bio = bio->bi_next;
879 d->ip.nxbio = bio;
880 if (bio == NULL)
881 d->ip.rq = NULL;
882 return d->ip.buf = buf;
883 }
884
885 /* enters with d->lock held */
886 void
887 aoecmd_work(struct aoedev *d)
888 {
889 rexmit_deferred(d);
890 while (aoecmd_ata_rw(d))
891 ;
892 }
893
894 /* this function performs work that has been deferred until sleeping is OK
895 */
896 void
897 aoecmd_sleepwork(struct work_struct *work)
898 {
899 struct aoedev *d = container_of(work, struct aoedev, work);
900
901 if (d->flags & DEVFL_GDALLOC)
902 aoeblk_gdalloc(d);
903
904 if (d->flags & DEVFL_NEWSIZE) {
905 set_capacity_and_notify(d->gd, d->ssize);
906
907 spin_lock_irq(&d->lock);
908 d->flags |= DEVFL_UP;
909 d->flags &= ~DEVFL_NEWSIZE;
910 spin_unlock_irq(&d->lock);
911 }
912 }
913
914 static void
915 ata_ident_fixstring(u16 *id, int ns)
916 {
917 u16 s;
918
919 while (ns-- > 0) {
920 s = *id;
921 *id++ = s >> 8 | s << 8;
922 }
923 }
924
925 static void
926 ataid_complete(struct aoedev *d, struct aoetgt *t, unsigned char *id)
927 {
928 u64 ssize;
929 u16 n;
930
931 /* word 83: command set supported */
932 n = get_unaligned_le16(&id[83 << 1]);
933
934 /* word 86: command set/feature enabled */
935 n |= get_unaligned_le16(&id[86 << 1]);
936
937 if (n & (1<<10)) { /* bit 10: LBA 48 */
938 d->flags |= DEVFL_EXT;
939
940 /* word 100: number lba48 sectors */
941 ssize = get_unaligned_le64(&id[100 << 1]);
942
943 /* set as in ide-disk.c:init_idedisk_capacity */
944 d->geo.cylinders = ssize;
945 d->geo.cylinders /= (255 * 63);
946 d->geo.heads = 255;
947 d->geo.sectors = 63;
948 } else {
949 d->flags &= ~DEVFL_EXT;
950
951 /* number lba28 sectors */
952 ssize = get_unaligned_le32(&id[60 << 1]);
953
954 /* NOTE: obsolete in ATA 6 */
955 d->geo.cylinders = get_unaligned_le16(&id[54 << 1]);
956 d->geo.heads = get_unaligned_le16(&id[55 << 1]);
957 d->geo.sectors = get_unaligned_le16(&id[56 << 1]);
958 }
959
960 ata_ident_fixstring((u16 *) &id[10<<1], 10); /* serial */
961 ata_ident_fixstring((u16 *) &id[23<<1], 4); /* firmware */
962 ata_ident_fixstring((u16 *) &id[27<<1], 20); /* model */
963 memcpy(d->ident, id, sizeof(d->ident));
964
965 if (d->ssize != ssize)
966 printk(KERN_INFO
967 "aoe: %pm e%ld.%d v%04x has %llu sectors\n",
968 t->addr,
969 d->aoemajor, d->aoeminor,
970 d->fw_ver, (long long)ssize);
971 d->ssize = ssize;
972 d->geo.start = 0;
973 if (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE))
974 return;
975 if (d->gd != NULL)
976 d->flags |= DEVFL_NEWSIZE;
977 else
978 d->flags |= DEVFL_GDALLOC;
979 queue_work(aoe_wq, &d->work);
980 }
981
982 static void
983 calc_rttavg(struct aoedev *d, struct aoetgt *t, int rtt)
984 {
985 register long n;
986
987 n = rtt;
988
989 /* cf. Congestion Avoidance and Control, Jacobson & Karels, 1988 */
990 n -= d->rttavg >> RTTSCALE;
991 d->rttavg += n;
992 if (n < 0)
993 n = -n;
994 n -= d->rttdev >> RTTDSCALE;
995 d->rttdev += n;
996
997 if (!t || t->maxout >= t->nframes)
998 return;
999 if (t->maxout < t->ssthresh)
1000 t->maxout += 1;
1001 else if (t->nout == t->maxout && t->next_cwnd-- == 0) {
1002 t->maxout += 1;
1003 t->next_cwnd = t->maxout;
1004 }
1005 }
1006
1007 static struct aoetgt *
1008 gettgt(struct aoedev *d, char *addr)
1009 {
1010 struct aoetgt **t, **e;
1011
1012 t = d->targets;
1013 e = t + d->ntargets;
1014 for (; t < e && *t; t++)
1015 if (memcmp((*t)->addr, addr, sizeof((*t)->addr)) == 0)
1016 return *t;
1017 return NULL;
1018 }
1019
1020 static void
1021 bvcpy(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter, long cnt)
1022 {
1023 int soff = 0;
1024 struct bio_vec bv;
1025
1026 iter.bi_size = cnt;
1027
1028 __bio_for_each_segment(bv, bio, iter, iter) {
1029 char *p = bvec_kmap_local(&bv);
1030 skb_copy_bits(skb, soff, p, bv.bv_len);
1031 kunmap_local(p);
1032 soff += bv.bv_len;
1033 }
1034 }
1035
1036 void
1037 aoe_end_request(struct aoedev *d, struct request *rq, int fastfail)
1038 {
1039 struct bio *bio;
1040 int bok;
1041 struct request_queue *q;
1042 blk_status_t err = BLK_STS_OK;
1043
1044 q = d->blkq;
1045 if (rq == d->ip.rq)
1046 d->ip.rq = NULL;
1047 do {
1048 bio = rq->bio;
1049 bok = !fastfail && !bio->bi_status;
1050 if (!bok)
1051 err = BLK_STS_IOERR;
1052 } while (blk_update_request(rq, bok ? BLK_STS_OK : BLK_STS_IOERR, bio->bi_iter.bi_size));
1053
1054 __blk_mq_end_request(rq, err);
1055
1056 /* cf. https://lore.kernel.org/lkml/20061031071040.GS14055@kernel.dk/ */
1057 if (!fastfail)
1058 blk_mq_run_hw_queues(q, true);
1059 }
1060
1061 static void
1062 aoe_end_buf(struct aoedev *d, struct buf *buf)
1063 {
1064 struct request *rq = buf->rq;
1065 struct aoe_req *req = blk_mq_rq_to_pdu(rq);
1066
1067 if (buf == d->ip.buf)
1068 d->ip.buf = NULL;
1069 mempool_free(buf, d->bufpool);
1070 if (--req->nr_bios == 0)
1071 aoe_end_request(d, rq, 0);
1072 }
1073
1074 static void
1075 ktiocomplete(struct frame *f)
1076 {
1077 struct aoe_hdr *hin, *hout;
1078 struct aoe_atahdr *ahin, *ahout;
1079 struct buf *buf;
1080 struct sk_buff *skb;
1081 struct aoetgt *t;
1082 struct aoeif *ifp;
1083 struct aoedev *d;
1084 long n;
1085 int untainted;
1086
1087 if (f == NULL)
1088 return;
1089
1090 t = f->t;
1091 d = t->d;
1092 skb = f->r_skb;
1093 buf = f->buf;
1094 if (f->flags & FFL_PROBE)
1095 goto out;
1096 if (!skb) /* just fail the buf. */
1097 goto noskb;
1098
1099 hout = (struct aoe_hdr *) skb_mac_header(f->skb);
1100 ahout = (struct aoe_atahdr *) (hout+1);
1101
1102 hin = (struct aoe_hdr *) skb->data;
1103 skb_pull(skb, sizeof(*hin));
1104 ahin = (struct aoe_atahdr *) skb->data;
1105 skb_pull(skb, sizeof(*ahin));
1106 if (ahin->cmdstat & 0xa9) { /* these bits cleared on success */
1107 pr_err("aoe: ata error cmd=%2.2Xh stat=%2.2Xh from e%ld.%d\n",
1108 ahout->cmdstat, ahin->cmdstat,
1109 d->aoemajor, d->aoeminor);
1110 noskb: if (buf)
1111 buf->bio->bi_status = BLK_STS_IOERR;
1112 goto out;
1113 }
1114
1115 n = ahout->scnt << 9;
1116 switch (ahout->cmdstat) {
1117 case ATA_CMD_PIO_READ:
1118 case ATA_CMD_PIO_READ_EXT:
1119 if (skb->len < n) {
1120 pr_err("%s e%ld.%d. skb->len=%d need=%ld\n",
1121 "aoe: runt data size in read from",
1122 (long) d->aoemajor, d->aoeminor,
1123 skb->len, n);
1124 buf->bio->bi_status = BLK_STS_IOERR;
1125 break;
1126 }
1127 if (n > f->iter.bi_size) {
1128 pr_err_ratelimited("%s e%ld.%d. bytes=%ld need=%u\n",
1129 "aoe: too-large data size in read from",
1130 (long) d->aoemajor, d->aoeminor,
1131 n, f->iter.bi_size);
1132 buf->bio->bi_status = BLK_STS_IOERR;
1133 break;
1134 }
1135 bvcpy(skb, f->buf->bio, f->iter, n);
1136 fallthrough;
1137 case ATA_CMD_PIO_WRITE:
1138 case ATA_CMD_PIO_WRITE_EXT:
1139 spin_lock_irq(&d->lock);
1140 ifp = getif(t, skb->dev);
1141 if (ifp)
1142 ifp->lost = 0;
1143 spin_unlock_irq(&d->lock);
1144 break;
1145 case ATA_CMD_ID_ATA:
1146 if (skb->len < 512) {
1147 pr_info("%s e%ld.%d. skb->len=%d need=512\n",
1148 "aoe: runt data size in ataid from",
1149 (long) d->aoemajor, d->aoeminor,
1150 skb->len);
1151 break;
1152 }
1153 if (skb_linearize(skb))
1154 break;
1155 spin_lock_irq(&d->lock);
1156 ataid_complete(d, t, skb->data);
1157 spin_unlock_irq(&d->lock);
1158 break;
1159 default:
1160 pr_info("aoe: unrecognized ata command %2.2Xh for %d.%d\n",
1161 ahout->cmdstat,
1162 be16_to_cpu(get_unaligned(&hin->major)),
1163 hin->minor);
1164 }
1165 out:
1166 spin_lock_irq(&d->lock);
1167 if (t->taint > 0
1168 && --t->taint > 0
1169 && t->nout_probes == 0) {
1170 count_targets(d, &untainted);
1171 if (untainted > 0) {
1172 probe(t);
1173 t->nout_probes++;
1174 }
1175 }
1176
1177 aoe_freetframe(f);
1178
1179 if (buf && --buf->nframesout == 0 && buf->iter.bi_size == 0)
1180 aoe_end_buf(d, buf);
1181
1182 spin_unlock_irq(&d->lock);
1183 aoedev_put(d);
1184 dev_kfree_skb(skb);
1185 }
1186
1187 /* Enters with iocq.lock held.
1188 * Returns true iff responses needing processing remain.
1189 */
1190 static int
1191 ktio(int id)
1192 {
1193 struct frame *f;
1194 struct list_head *pos;
1195 int i;
1196 int actual_id;
1197
1198 for (i = 0; ; ++i) {
1199 if (i == MAXIOC)
1200 return 1;
1201 if (list_empty(&iocq[id].head))
1202 return 0;
1203 pos = iocq[id].head.next;
1204 list_del(pos);
1205 f = list_entry(pos, struct frame, head);
1206 spin_unlock_irq(&iocq[id].lock);
1207 ktiocomplete(f);
1208
1209 /* Figure out if extra threads are required. */
1210 actual_id = f->t->d->aoeminor % ncpus;
1211
1212 if (!kts[actual_id].active) {
1213 BUG_ON(id != 0);
1214 mutex_lock(&ktio_spawn_lock);
1215 if (!kts[actual_id].active
1216 && aoe_ktstart(&kts[actual_id]) == 0)
1217 kts[actual_id].active = 1;
1218 mutex_unlock(&ktio_spawn_lock);
1219 }
1220 spin_lock_irq(&iocq[id].lock);
1221 }
1222 }
1223
1224 static int
1225 kthread(void *vp)
1226 {
1227 struct ktstate *k;
1228 DECLARE_WAITQUEUE(wait, current);
1229 int more;
1230
1231 k = vp;
1232 current->flags |= PF_NOFREEZE;
1233 set_user_nice(current, -10);
1234 complete(&k->rendez); /* tell spawner we're running */
1235 do {
1236 spin_lock_irq(k->lock);
1237 more = k->fn(k->id);
1238 if (!more) {
1239 add_wait_queue(k->waitq, &wait);
1240 __set_current_state(TASK_INTERRUPTIBLE);
1241 }
1242 spin_unlock_irq(k->lock);
1243 if (!more) {
1244 schedule();
1245 remove_wait_queue(k->waitq, &wait);
1246 } else
1247 cond_resched();
1248 } while (!kthread_should_stop());
1249 complete(&k->rendez); /* tell spawner we're stopping */
1250 return 0;
1251 }
1252
1253 void
1254 aoe_ktstop(struct ktstate *k)
1255 {
1256 kthread_stop(k->task);
1257 wait_for_completion(&k->rendez);
1258 }
1259
1260 int
1261 aoe_ktstart(struct ktstate *k)
1262 {
1263 struct task_struct *task;
1264
1265 init_completion(&k->rendez);
1266 task = kthread_run(kthread, k, "%s", k->name);
1267 if (task == NULL || IS_ERR(task))
1268 return -ENOMEM;
1269 k->task = task;
1270 wait_for_completion(&k->rendez); /* allow kthread to start */
1271 init_completion(&k->rendez); /* for waiting for exit later */
1272 return 0;
1273 }
1274
1275 /* pass it off to kthreads for processing */
1276 static void
1277 ktcomplete(struct frame *f, struct sk_buff *skb)
1278 {
1279 int id;
1280 ulong flags;
1281
1282 f->r_skb = skb;
1283 id = f->t->d->aoeminor % ncpus;
1284 spin_lock_irqsave(&iocq[id].lock, flags);
1285 if (!kts[id].active) {
1286 spin_unlock_irqrestore(&iocq[id].lock, flags);
1287 /* The thread with id has not been spawned yet,
1288 * so delegate the work to the main thread and
1289 * try spawning a new thread.
1290 */
1291 id = 0;
1292 spin_lock_irqsave(&iocq[id].lock, flags);
1293 }
1294 list_add_tail(&f->head, &iocq[id].head);
1295 spin_unlock_irqrestore(&iocq[id].lock, flags);
1296 wake_up(&ktiowq[id]);
1297 }
1298
1299 struct sk_buff *
1300 aoecmd_ata_rsp(struct sk_buff *skb)
1301 {
1302 struct aoedev *d;
1303 struct aoe_hdr *h;
1304 struct frame *f;
1305 u32 n;
1306 ulong flags;
1307 char ebuf[128];
1308 u16 aoemajor;
1309
1310 h = (struct aoe_hdr *) skb->data;
1311 aoemajor = be16_to_cpu(get_unaligned(&h->major));
1312 d = aoedev_by_aoeaddr(aoemajor, h->minor, 0);
1313 if (d == NULL) {
1314 snprintf(ebuf, sizeof ebuf, "aoecmd_ata_rsp: ata response "
1315 "for unknown device %d.%d\n",
1316 aoemajor, h->minor);
1317 aoechr_error(ebuf);
1318 return skb;
1319 }
1320
1321 spin_lock_irqsave(&d->lock, flags);
1322
1323 n = be32_to_cpu(get_unaligned(&h->tag));
1324 f = getframe(d, n);
1325 if (f) {
1326 calc_rttavg(d, f->t, tsince_hr(f));
1327 f->t->nout--;
1328 if (f->flags & FFL_PROBE)
1329 f->t->nout_probes--;
1330 } else {
1331 f = getframe_deferred(d, n);
1332 if (f) {
1333 calc_rttavg(d, NULL, tsince_hr(f));
1334 } else {
1335 calc_rttavg(d, NULL, tsince(n));
1336 spin_unlock_irqrestore(&d->lock, flags);
1337 aoedev_put(d);
1338 snprintf(ebuf, sizeof(ebuf),
1339 "%15s e%d.%d tag=%08x@%08lx s=%pm d=%pm\n",
1340 "unexpected rsp",
1341 get_unaligned_be16(&h->major),
1342 h->minor,
1343 get_unaligned_be32(&h->tag),
1344 jiffies,
1345 h->src,
1346 h->dst);
1347 aoechr_error(ebuf);
1348 return skb;
1349 }
1350 }
1351 aoecmd_work(d);
1352
1353 spin_unlock_irqrestore(&d->lock, flags);
1354
1355 ktcomplete(f, skb);
1356
1357 /*
1358 * Note here that we do not perform an aoedev_put, as we are
1359 * leaving this reference for the ktio to release.
1360 */
1361 return NULL;
1362 }
1363
1364 void
1365 aoecmd_cfg(ushort aoemajor, unsigned char aoeminor)
1366 {
1367 struct sk_buff_head queue;
1368
1369 __skb_queue_head_init(&queue);
1370 aoecmd_cfg_pkts(aoemajor, aoeminor, &queue);
1371 aoenet_xmit(&queue);
1372 }
1373
1374 struct sk_buff *
1375 aoecmd_ata_id(struct aoedev *d)
1376 {
1377 struct aoe_hdr *h;
1378 struct aoe_atahdr *ah;
1379 struct frame *f;
1380 struct sk_buff *skb;
1381 struct aoetgt *t;
1382
1383 f = newframe(d);
1384 if (f == NULL)
1385 return NULL;
1386
1387 t = *d->tgt;
1388
1389 /* initialize the headers & frame */
1390 skb = f->skb;
1391 h = (struct aoe_hdr *) skb_mac_header(skb);
1392 ah = (struct aoe_atahdr *) (h+1);
1393 skb_put(skb, sizeof *h + sizeof *ah);
1394 memset(h, 0, skb->len);
1395 f->tag = aoehdr_atainit(d, t, h);
1396 fhash(f);
1397 t->nout++;
1398 f->waited = 0;
1399 f->waited_total = 0;
1400
1401 /* set up ata header */
1402 ah->scnt = 1;
1403 ah->cmdstat = ATA_CMD_ID_ATA;
1404 ah->lba3 = 0xa0;
1405
1406 dev_hold(t->ifp->nd);
1407 skb->dev = t->ifp->nd;
1408
1409 d->rttavg = RTTAVG_INIT;
1410 d->rttdev = RTTDEV_INIT;
1411 d->timer.function = rexmit_timer;
1412
1413 skb = skb_clone(skb, GFP_ATOMIC);
1414 if (skb)
1415 f->sent = ktime_get();
1416 else
1417 dev_put(t->ifp->nd);
1418
1419 return skb;
1420 }
1421
1422 static struct aoetgt **
1423 grow_targets(struct aoedev *d)
1424 {
1425 ulong oldn, newn;
1426 struct aoetgt **tt;
1427
1428 oldn = d->ntargets;
1429 newn = oldn * 2;
1430 tt = kcalloc(newn, sizeof(*d->targets), GFP_ATOMIC);
1431 if (!tt)
1432 return NULL;
1433 memmove(tt, d->targets, sizeof(*d->targets) * oldn);
1434 d->tgt = tt + (d->tgt - d->targets);
1435 kfree(d->targets);
1436 d->targets = tt;
1437 d->ntargets = newn;
1438
1439 return &d->targets[oldn];
1440 }
1441
1442 static struct aoetgt *
1443 addtgt(struct aoedev *d, char *addr, ulong nframes)
1444 {
1445 struct aoetgt *t, **tt, **te;
1446
1447 tt = d->targets;
1448 te = tt + d->ntargets;
1449 for (; tt < te && *tt; tt++)
1450 ;
1451
1452 if (tt == te) {
1453 tt = grow_targets(d);
1454 if (!tt)
1455 goto nomem;
1456 }
1457 t = kzalloc(sizeof(*t), GFP_ATOMIC);
1458 if (!t)
1459 goto nomem;
1460 t->nframes = nframes;
1461 t->d = d;
1462 memcpy(t->addr, addr, sizeof t->addr);
1463 t->ifp = t->ifs;
1464 aoecmd_wreset(t);
1465 t->maxout = t->nframes / 2;
1466 INIT_LIST_HEAD(&t->ffree);
1467 return *tt = t;
1468
1469 nomem:
1470 pr_info("aoe: cannot allocate memory to add target\n");
1471 return NULL;
1472 }
1473
1474 static void
1475 setdbcnt(struct aoedev *d)
1476 {
1477 struct aoetgt **t, **e;
1478 int bcnt = 0;
1479
1480 t = d->targets;
1481 e = t + d->ntargets;
1482 for (; t < e && *t; t++)
1483 if (bcnt == 0 || bcnt > (*t)->minbcnt)
1484 bcnt = (*t)->minbcnt;
1485 if (bcnt != d->maxbcnt) {
1486 d->maxbcnt = bcnt;
1487 pr_info("aoe: e%ld.%d: setting %d byte data frames\n",
1488 d->aoemajor, d->aoeminor, bcnt);
1489 }
1490 }
1491
1492 static void
1493 setifbcnt(struct aoetgt *t, struct net_device *nd, int bcnt)
1494 {
1495 struct aoedev *d;
1496 struct aoeif *p, *e;
1497 int minbcnt;
1498
1499 d = t->d;
1500 minbcnt = bcnt;
1501 p = t->ifs;
1502 e = p + NAOEIFS;
1503 for (; p < e; p++) {
1504 if (p->nd == NULL)
1505 break; /* end of the valid interfaces */
1506 if (p->nd == nd) {
1507 p->bcnt = bcnt; /* we're updating */
1508 nd = NULL;
1509 } else if (minbcnt > p->bcnt)
1510 minbcnt = p->bcnt; /* find the min interface */
1511 }
1512 if (nd) {
1513 if (p == e) {
1514 pr_err("aoe: device setifbcnt failure; too many interfaces.\n");
1515 return;
1516 }
1517 dev_hold(nd);
1518 p->nd = nd;
1519 p->bcnt = bcnt;
1520 }
1521 t->minbcnt = minbcnt;
1522 setdbcnt(d);
1523 }
1524
1525 void
1526 aoecmd_cfg_rsp(struct sk_buff *skb)
1527 {
1528 struct aoedev *d;
1529 struct aoe_hdr *h;
1530 struct aoe_cfghdr *ch;
1531 struct aoetgt *t;
1532 ulong flags, aoemajor;
1533 struct sk_buff *sl;
1534 struct sk_buff_head queue;
1535 u16 n;
1536
1537 sl = NULL;
1538 h = (struct aoe_hdr *) skb_mac_header(skb);
1539 ch = (struct aoe_cfghdr *) (h+1);
1540
1541 /*
1542 * Enough people have their dip switches set backwards to
1543 * warrant a loud message for this special case.
1544 */
1545 aoemajor = get_unaligned_be16(&h->major);
1546 if (aoemajor == 0xfff) {
1547 printk(KERN_ERR "aoe: Warning: shelf address is all ones. "
1548 "Check shelf dip switches.\n");
1549 return;
1550 }
1551 if (aoemajor == 0xffff) {
1552 pr_info("aoe: e%ld.%d: broadcast shelf number invalid\n",
1553 aoemajor, (int) h->minor);
1554 return;
1555 }
1556 if (h->minor == 0xff) {
1557 pr_info("aoe: e%ld.%d: broadcast slot number invalid\n",
1558 aoemajor, (int) h->minor);
1559 return;
1560 }
1561
1562 n = be16_to_cpu(ch->bufcnt);
1563 if (n > aoe_maxout) /* keep it reasonable */
1564 n = aoe_maxout;
1565
1566 d = aoedev_by_aoeaddr(aoemajor, h->minor, 1);
1567 if (d == NULL) {
1568 pr_info("aoe: device allocation failure\n");
1569 return;
1570 }
1571
1572 spin_lock_irqsave(&d->lock, flags);
1573
1574 t = gettgt(d, h->src);
1575 if (t) {
1576 t->nframes = n;
1577 if (n < t->maxout)
1578 aoecmd_wreset(t);
1579 } else {
1580 t = addtgt(d, h->src, n);
1581 if (!t)
1582 goto bail;
1583 }
1584 n = skb->dev->mtu;
1585 n -= sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr);
1586 n /= 512;
1587 if (n > ch->scnt)
1588 n = ch->scnt;
1589 n = n ? n * 512 : DEFAULTBCNT;
1590 setifbcnt(t, skb->dev, n);
1591
1592 /* don't change users' perspective */
1593 if (d->nopen == 0) {
1594 d->fw_ver = be16_to_cpu(ch->fwver);
1595 sl = aoecmd_ata_id(d);
1596 }
1597 bail:
1598 spin_unlock_irqrestore(&d->lock, flags);
1599 aoedev_put(d);
1600 if (sl) {
1601 __skb_queue_head_init(&queue);
1602 __skb_queue_tail(&queue, sl);
1603 aoenet_xmit(&queue);
1604 }
1605 }
1606
1607 void
1608 aoecmd_wreset(struct aoetgt *t)
1609 {
1610 t->maxout = 1;
1611 t->ssthresh = t->nframes / 2;
1612 t->next_cwnd = t->nframes;
1613 }
1614
1615 void
1616 aoecmd_cleanslate(struct aoedev *d)
1617 {
1618 struct aoetgt **t, **te;
1619
1620 d->rttavg = RTTAVG_INIT;
1621 d->rttdev = RTTDEV_INIT;
1622 d->maxbcnt = 0;
1623
1624 t = d->targets;
1625 te = t + d->ntargets;
1626 for (; t < te && *t; t++)
1627 aoecmd_wreset(*t);
1628 }
1629
1630 void
1631 aoe_failbuf(struct aoedev *d, struct buf *buf)
1632 {
1633 if (buf == NULL)
1634 return;
1635 buf->iter.bi_size = 0;
1636 buf->bio->bi_status = BLK_STS_IOERR;
1637 if (buf->nframesout == 0)
1638 aoe_end_buf(d, buf);
1639 }
1640
1641 void
1642 aoe_flush_iocq(void)
1643 {
1644 int i;
1645
1646 for (i = 0; i < ncpus; i++) {
1647 if (kts[i].active)
1648 aoe_flush_iocq_by_index(i);
1649 }
1650 }
1651
1652 void
1653 aoe_flush_iocq_by_index(int id)
1654 {
1655 struct frame *f;
1656 struct aoedev *d;
1657 LIST_HEAD(flist);
1658 struct list_head *pos;
1659 struct sk_buff *skb;
1660 ulong flags;
1661
1662 spin_lock_irqsave(&iocq[id].lock, flags);
1663 list_splice_init(&iocq[id].head, &flist);
1664 spin_unlock_irqrestore(&iocq[id].lock, flags);
1665 while (!list_empty(&flist)) {
1666 pos = flist.next;
1667 list_del(pos);
1668 f = list_entry(pos, struct frame, head);
1669 d = f->t->d;
1670 skb = f->r_skb;
1671 spin_lock_irqsave(&d->lock, flags);
1672 if (f->buf) {
1673 f->buf->nframesout--;
1674 aoe_failbuf(d, f->buf);
1675 }
1676 aoe_freetframe(f);
1677 spin_unlock_irqrestore(&d->lock, flags);
1678 dev_kfree_skb(skb);
1679 aoedev_put(d);
1680 }
1681 }
1682
1683 int __init
1684 aoecmd_init(void)
1685 {
1686 void *p;
1687 int i;
1688 int ret;
1689
1690 /* get_zeroed_page returns page with ref count 1 */
1691 p = (void *) get_zeroed_page(GFP_KERNEL);
1692 if (!p)
1693 return -ENOMEM;
1694 empty_page = virt_to_page(p);
1695
1696 ncpus = num_online_cpus();
1697
1698 iocq = kcalloc(ncpus, sizeof(struct iocq_ktio), GFP_KERNEL);
1699 if (!iocq)
1700 return -ENOMEM;
1701
1702 kts = kcalloc(ncpus, sizeof(struct ktstate), GFP_KERNEL);
1703 if (!kts) {
1704 ret = -ENOMEM;
1705 goto kts_fail;
1706 }
1707
1708 ktiowq = kcalloc(ncpus, sizeof(wait_queue_head_t), GFP_KERNEL);
1709 if (!ktiowq) {
1710 ret = -ENOMEM;
1711 goto ktiowq_fail;
1712 }
1713
1714 for (i = 0; i < ncpus; i++) {
1715 INIT_LIST_HEAD(&iocq[i].head);
1716 spin_lock_init(&iocq[i].lock);
1717 init_waitqueue_head(&ktiowq[i]);
1718 snprintf(kts[i].name, sizeof(kts[i].name), "aoe_ktio%d", i);
1719 kts[i].fn = ktio;
1720 kts[i].waitq = &ktiowq[i];
1721 kts[i].lock = &iocq[i].lock;
1722 kts[i].id = i;
1723 kts[i].active = 0;
1724 }
1725 kts[0].active = 1;
1726 if (aoe_ktstart(&kts[0])) {
1727 ret = -ENOMEM;
1728 goto ktstart_fail;
1729 }
1730 return 0;
1731
1732 ktstart_fail:
1733 kfree(ktiowq);
1734 ktiowq_fail:
1735 kfree(kts);
1736 kts_fail:
1737 kfree(iocq);
1738
1739 return ret;
1740 }
1741
1742 void
1743 aoecmd_exit(void)
1744 {
1745 int i;
1746
1747 for (i = 0; i < ncpus; i++)
1748 if (kts[i].active)
1749 aoe_ktstop(&kts[i]);
1750
1751 aoe_flush_iocq();
1752
1753 /* Free up the iocq and thread speicific configuration
1754 * allocated during startup.
1755 */
1756 kfree(iocq);
1757 kfree(kts);
1758 kfree(ktiowq);
1759
1760 free_page((unsigned long) page_address(empty_page));
1761 empty_page = NULL;
1762 }
Kernel DRM miscellaneous fixes and cross-tree changes