1 /* Copyright (c) 2013 Coraid, Inc. See COPYING for GPL terms. */
4 * Filesystem request handling methods
8 #include <linux/slab.h>
9 #include <linux/hdreg.h>
10 #include <linux/blkdev.h>
11 #include <linux/skbuff.h>
12 #include <linux/netdevice.h>
13 #include <linux/genhd.h>
14 #include <linux/moduleparam.h>
15 #include <linux/workqueue.h>
16 #include <linux/kthread.h>
17 #include <net/net_namespace.h>
18 #include <asm/unaligned.h>
19 #include <linux/uio.h>
22 #define MAXIOC (8192) /* default meant to avoid most soft lockups */
24 static void ktcomplete(struct frame *, struct sk_buff *);
25 static int count_targets(struct aoedev *d, int *untainted);
27 static struct buf *nextbuf(struct aoedev *);
29 static int aoe_deadsecs = 60 * 3;
30 module_param(aoe_deadsecs, int, 0644);
31 MODULE_PARM_DESC(aoe_deadsecs, "After aoe_deadsecs seconds, give up and fail dev.");
33 static int aoe_maxout = 64;
34 module_param(aoe_maxout, int, 0644);
35 MODULE_PARM_DESC(aoe_maxout,
36 "Only aoe_maxout outstanding packets for every MAC on eX.Y.");
38 /* The number of online cpus during module initialization gives us a
39 * convenient heuristic cap on the parallelism used for ktio threads
40 * doing I/O completion. It is not important that the cap equal the
41 * actual number of running CPUs at any given time, but because of CPU
42 * hotplug, we take care to use ncpus instead of using
43 * num_online_cpus() after module initialization.
47 /* mutex lock used for synchronization while thread spawning */
48 static DEFINE_MUTEX(ktio_spawn_lock);
50 static wait_queue_head_t *ktiowq;
51 static struct ktstate *kts;
53 /* io completion queue */
55 struct list_head head;
58 static struct iocq_ktio *iocq;
60 static struct page *empty_page;
62 static struct sk_buff *
67 skb = alloc_skb(len + MAX_HEADER, GFP_ATOMIC);
69 skb_reserve(skb, MAX_HEADER);
70 skb_reset_mac_header(skb);
71 skb_reset_network_header(skb);
72 skb->protocol = __constant_htons(ETH_P_AOE);
73 skb_checksum_none_assert(skb);
79 getframe_deferred(struct aoedev *d, u32 tag)
81 struct list_head *head, *pos, *nx;
85 list_for_each_safe(pos, nx, head) {
86 f = list_entry(pos, struct frame, head);
96 getframe(struct aoedev *d, u32 tag)
99 struct list_head *head, *pos, *nx;
103 head = &d->factive[n];
104 list_for_each_safe(pos, nx, head) {
105 f = list_entry(pos, struct frame, head);
115 * Leave the top bit clear so we have tagspace for userland.
116 * The bottom 16 bits are the xmit tick for rexmit/rttavg processing.
117 * This driver reserves tag -1 to mean "unused frame."
120 newtag(struct aoedev *d)
124 n = jiffies & 0xffff;
125 return n |= (++d->lasttag & 0x7fff) << 16;
129 aoehdr_atainit(struct aoedev *d, struct aoetgt *t, struct aoe_hdr *h)
131 u32 host_tag = newtag(d);
133 memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src);
134 memcpy(h->dst, t->addr, sizeof h->dst);
135 h->type = __constant_cpu_to_be16(ETH_P_AOE);
137 h->major = cpu_to_be16(d->aoemajor);
138 h->minor = d->aoeminor;
140 h->tag = cpu_to_be32(host_tag);
146 put_lba(struct aoe_atahdr *ah, sector_t lba)
149 ah->lba1 = lba >>= 8;
150 ah->lba2 = lba >>= 8;
151 ah->lba3 = lba >>= 8;
152 ah->lba4 = lba >>= 8;
153 ah->lba5 = lba >>= 8;
156 static struct aoeif *
157 ifrotate(struct aoetgt *t)
163 if (ifp >= &t->ifs[NAOEIFS] || ifp->nd == NULL)
171 skb_pool_put(struct aoedev *d, struct sk_buff *skb)
173 __skb_queue_tail(&d->skbpool, skb);
176 static struct sk_buff *
177 skb_pool_get(struct aoedev *d)
179 struct sk_buff *skb = skb_peek(&d->skbpool);
181 if (skb && atomic_read(&skb_shinfo(skb)->dataref) == 1) {
182 __skb_unlink(skb, &d->skbpool);
185 if (skb_queue_len(&d->skbpool) < NSKBPOOLMAX &&
186 (skb = new_skb(ETH_ZLEN)))
193 aoe_freetframe(struct frame *f)
199 memset(&f->iter, 0, sizeof(f->iter));
202 list_add(&f->head, &t->ffree);
205 static struct frame *
206 newtframe(struct aoedev *d, struct aoetgt *t)
210 struct list_head *pos;
212 if (list_empty(&t->ffree)) {
213 if (t->falloc >= NSKBPOOLMAX*2)
215 f = kcalloc(1, sizeof(*f), GFP_ATOMIC);
223 f = list_entry(pos, struct frame, head);
228 f->skb = skb = new_skb(ETH_ZLEN);
230 bail: aoe_freetframe(f);
235 if (atomic_read(&skb_shinfo(skb)->dataref) != 1) {
236 skb = skb_pool_get(d);
239 skb_pool_put(d, f->skb);
243 skb->truesize -= skb->data_len;
244 skb_shinfo(skb)->nr_frags = skb->data_len = 0;
249 static struct frame *
250 newframe(struct aoedev *d)
253 struct aoetgt *t, **tt;
258 if (!d->targets || !d->targets[0]) {
259 printk(KERN_ERR "aoe: NULL TARGETS!\n");
262 tt = d->tgt; /* last used target */
263 for (use_tainted = 0, has_untainted = 0;;) {
265 if (tt >= &d->targets[d->ntargets] || !*tt)
272 if (t->nout < t->maxout
273 && (use_tainted || !t->taint)
282 if (tt == d->tgt) { /* we've looped and found nada */
283 if (!use_tainted && !has_untainted)
291 d->flags |= DEVFL_KICKME;
297 skb_fillup(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter)
302 __bio_for_each_segment(bv, bio, iter, iter)
303 skb_fill_page_desc(skb, frag++, bv.bv_page,
304 bv.bv_offset, bv.bv_len);
308 fhash(struct frame *f)
310 struct aoedev *d = f->t->d;
313 n = f->tag % NFACTIVE;
314 list_add_tail(&f->head, &d->factive[n]);
318 ata_rw_frameinit(struct frame *f)
322 struct aoe_atahdr *ah;
324 char writebit, extbit;
327 h = (struct aoe_hdr *) skb_mac_header(skb);
328 ah = (struct aoe_atahdr *) (h + 1);
329 skb_put(skb, sizeof(*h) + sizeof(*ah));
330 memset(h, 0, skb->len);
336 f->tag = aoehdr_atainit(t->d, t, h);
342 /* set up ata header */
343 ah->scnt = f->iter.bi_size >> 9;
344 put_lba(ah, f->iter.bi_sector);
345 if (t->d->flags & DEVFL_EXT) {
346 ah->aflags |= AOEAFL_EXT;
350 ah->lba3 |= 0xe0; /* LBA bit + obsolete 0xa0 */
352 if (f->buf && bio_data_dir(f->buf->bio) == WRITE) {
353 skb_fillup(skb, f->buf->bio, f->iter);
354 ah->aflags |= AOEAFL_WRITE;
355 skb->len += f->iter.bi_size;
356 skb->data_len = f->iter.bi_size;
357 skb->truesize += f->iter.bi_size;
364 ah->cmdstat = ATA_CMD_PIO_READ | writebit | extbit;
365 skb->dev = t->ifp->nd;
369 aoecmd_ata_rw(struct aoedev *d)
374 struct sk_buff_head queue;
383 /* initialize the headers & frame */
386 f->iter.bi_size = min_t(unsigned long,
387 d->maxbcnt ?: DEFAULTBCNT,
389 bio_advance_iter(buf->bio, &buf->iter, f->iter.bi_size);
391 if (!buf->iter.bi_size)
394 /* mark all tracking fields and load out */
395 buf->nframesout += 1;
399 skb = skb_clone(f->skb, GFP_ATOMIC);
401 do_gettimeofday(&f->sent);
402 f->sent_jiffs = (u32) jiffies;
403 __skb_queue_head_init(&queue);
404 __skb_queue_tail(&queue, skb);
410 /* some callers cannot sleep, and they can call this function,
411 * transmitting the packets later, when interrupts are on
414 aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff_head *queue)
417 struct aoe_cfghdr *ch;
419 struct net_device *ifp;
422 for_each_netdev_rcu(&init_net, ifp) {
424 if (!is_aoe_netif(ifp))
427 skb = new_skb(sizeof *h + sizeof *ch);
429 printk(KERN_INFO "aoe: skb alloc failure\n");
432 skb_put(skb, sizeof *h + sizeof *ch);
434 __skb_queue_tail(queue, skb);
435 h = (struct aoe_hdr *) skb_mac_header(skb);
436 memset(h, 0, sizeof *h + sizeof *ch);
438 memset(h->dst, 0xff, sizeof h->dst);
439 memcpy(h->src, ifp->dev_addr, sizeof h->src);
440 h->type = __constant_cpu_to_be16(ETH_P_AOE);
442 h->major = cpu_to_be16(aoemajor);
453 resend(struct aoedev *d, struct frame *f)
456 struct sk_buff_head queue;
465 if (ifrotate(t) == NULL) {
466 /* probably can't happen, but set it up to fail anyway */
467 pr_info("aoe: resend: no interfaces to rotate to.\n");
471 h = (struct aoe_hdr *) skb_mac_header(skb);
473 if (!(f->flags & FFL_PROBE)) {
474 snprintf(buf, sizeof(buf),
475 "%15s e%ld.%d oldtag=%08x@%08lx newtag=%08x s=%pm d=%pm nout=%d\n",
476 "retransmit", d->aoemajor, d->aoeminor,
478 h->src, h->dst, t->nout);
484 h->tag = cpu_to_be32(n);
485 memcpy(h->dst, t->addr, sizeof h->dst);
486 memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src);
488 skb->dev = t->ifp->nd;
489 skb = skb_clone(skb, GFP_ATOMIC);
492 do_gettimeofday(&f->sent);
493 f->sent_jiffs = (u32) jiffies;
494 __skb_queue_head_init(&queue);
495 __skb_queue_tail(&queue, skb);
500 tsince_hr(struct frame *f)
505 do_gettimeofday(&now);
506 n = now.tv_usec - f->sent.tv_usec;
507 n += (now.tv_sec - f->sent.tv_sec) * USEC_PER_SEC;
512 /* For relatively long periods, use jiffies to avoid
513 * discrepancies caused by updates to the system time.
515 * On system with HZ of 1000, 32-bits is over 49 days
516 * worth of jiffies, or over 71 minutes worth of usecs.
518 * Jiffies overflow is handled by subtraction of unsigned ints:
519 * (gdb) print (unsigned) 2 - (unsigned) 0xfffffffe
523 if (n > USEC_PER_SEC / 4) {
524 n = ((u32) jiffies) - f->sent_jiffs;
525 n *= USEC_PER_SEC / HZ;
536 n = jiffies & 0xffff;
540 return jiffies_to_usecs(n + 1);
543 static struct aoeif *
544 getif(struct aoetgt *t, struct net_device *nd)
557 ejectif(struct aoetgt *t, struct aoeif *ifp)
560 struct net_device *nd;
564 e = t->ifs + NAOEIFS - 1;
565 n = (e - ifp) * sizeof *ifp;
566 memmove(ifp, ifp+1, n);
571 static struct frame *
572 reassign_frame(struct frame *f)
577 nf = newframe(f->t->d);
590 nf->waited_total = f->waited_total;
592 nf->sent_jiffs = f->sent_jiffs;
599 probe(struct aoetgt *t)
604 struct sk_buff_head queue;
611 pr_err("%s %pm for e%ld.%d: %s\n",
612 "aoe: cannot probe remote address",
614 (long) d->aoemajor, d->aoeminor,
615 "no frame available");
618 f->flags |= FFL_PROBE;
620 f->iter.bi_size = t->d->maxbcnt ? t->d->maxbcnt : DEFAULTBCNT;
623 for (frag = 0, n = f->iter.bi_size; n > 0; ++frag, n -= m) {
628 skb_fill_page_desc(skb, frag, empty_page, 0, m);
630 skb->len += f->iter.bi_size;
631 skb->data_len = f->iter.bi_size;
632 skb->truesize += f->iter.bi_size;
634 skb = skb_clone(f->skb, GFP_ATOMIC);
636 do_gettimeofday(&f->sent);
637 f->sent_jiffs = (u32) jiffies;
638 __skb_queue_head_init(&queue);
639 __skb_queue_tail(&queue, skb);
645 rto(struct aoedev *d)
649 t = 2 * d->rttavg >> RTTSCALE;
650 t += 8 * d->rttdev >> RTTDSCALE;
658 rexmit_deferred(struct aoedev *d)
663 struct list_head *pos, *nx, *head;
667 count_targets(d, &untainted);
670 list_for_each_safe(pos, nx, head) {
671 f = list_entry(pos, struct frame, head);
674 if (!(f->flags & FFL_PROBE)) {
675 nf = reassign_frame(f);
677 if (t->nout_probes == 0
682 list_replace(&f->head, &nf->head);
688 } else if (untainted < 1) {
689 /* don't probe w/o other untainted aoetgts */
691 } else if (tsince_hr(f) < t->taint * rto(d)) {
692 /* reprobe slowly when taint is high */
695 } else if (f->flags & FFL_PROBE) {
696 stop_probe: /* don't probe untainted aoetgts */
699 /* leaving d->kicked, because this is routine */
700 f->t->d->flags |= DEVFL_KICKME;
703 if (t->nout >= t->maxout)
707 if (f->flags & FFL_PROBE)
709 since = tsince_hr(f);
711 f->waited_total += since;
716 /* An aoetgt accumulates demerits quickly, and successful
717 * probing redeems the aoetgt slowly.
720 scorn(struct aoetgt *t)
725 t->taint += t->taint * 2;
728 if (t->taint > MAX_TAINT)
729 t->taint = MAX_TAINT;
733 count_targets(struct aoedev *d, int *untainted)
737 for (i = good = 0; i < d->ntargets && d->targets[i]; ++i)
738 if (d->targets[i]->taint == 0)
747 rexmit_timer(ulong vp)
753 struct list_head *head, *pos, *nx;
755 register long timeout;
758 int utgts; /* number of aoetgt descriptors (not slots) */
761 d = (struct aoedev *) vp;
763 spin_lock_irqsave(&d->lock, flags);
765 /* timeout based on observed timings and variations */
768 utgts = count_targets(d, NULL);
770 if (d->flags & DEVFL_TKILL) {
771 spin_unlock_irqrestore(&d->lock, flags);
775 /* collect all frames to rexmit into flist */
776 for (i = 0; i < NFACTIVE; i++) {
777 head = &d->factive[i];
778 list_for_each_safe(pos, nx, head) {
779 f = list_entry(pos, struct frame, head);
780 if (tsince_hr(f) < timeout)
781 break; /* end of expired frames */
782 /* move to flist for later processing */
783 list_move_tail(pos, &flist);
787 /* process expired frames */
788 while (!list_empty(&flist)) {
790 f = list_entry(pos, struct frame, head);
791 since = tsince_hr(f);
792 n = f->waited_total + since;
796 && !(f->flags & FFL_PROBE)) {
797 /* Waited too long. Device failure.
798 * Hang all frames on first hash bucket for downdev
801 list_splice(&flist, &d->factive[0]);
807 n = f->waited + since;
809 if (aoe_deadsecs && utgts > 0
810 && (n > aoe_deadsecs / utgts || n > HARD_SCORN_SECS))
811 scorn(t); /* avoid this target */
813 if (t->maxout != 1) {
814 t->ssthresh = t->maxout / 2;
818 if (f->flags & FFL_PROBE) {
821 ifp = getif(t, f->skb->dev);
822 if (ifp && ++ifp->lost > (t->nframes << 1)
823 && (ifp != t->ifs || t->ifs[1].nd)) {
828 list_move_tail(pos, &d->rexmitq);
834 if ((d->flags & DEVFL_KICKME) && d->blkq) {
835 d->flags &= ~DEVFL_KICKME;
836 d->blkq->request_fn(d->blkq);
839 d->timer.expires = jiffies + TIMERTICK;
840 add_timer(&d->timer);
842 spin_unlock_irqrestore(&d->lock, flags);
846 rqbiocnt(struct request *r)
851 __rq_for_each_bio(bio, r)
857 bufinit(struct buf *buf, struct request *rq, struct bio *bio)
859 memset(buf, 0, sizeof(*buf));
862 buf->iter = bio->bi_iter;
866 nextbuf(struct aoedev *d)
869 struct request_queue *q;
875 return NULL; /* initializing */
880 rq = blk_peek_request(q);
883 blk_start_request(rq);
885 d->ip.nxbio = rq->bio;
886 rq->special = (void *) rqbiocnt(rq);
888 buf = mempool_alloc(d->bufpool, GFP_ATOMIC);
890 pr_err("aoe: nextbuf: unable to mempool_alloc!\n");
894 bufinit(buf, rq, bio);
899 return d->ip.buf = buf;
902 /* enters with d->lock held */
904 aoecmd_work(struct aoedev *d)
907 while (aoecmd_ata_rw(d))
911 /* this function performs work that has been deferred until sleeping is OK
914 aoecmd_sleepwork(struct work_struct *work)
916 struct aoedev *d = container_of(work, struct aoedev, work);
917 struct block_device *bd;
920 if (d->flags & DEVFL_GDALLOC)
923 if (d->flags & DEVFL_NEWSIZE) {
924 ssize = get_capacity(d->gd);
925 bd = bdget_disk(d->gd, 0);
927 inode_lock(bd->bd_inode);
928 i_size_write(bd->bd_inode, (loff_t)ssize<<9);
929 inode_unlock(bd->bd_inode);
932 spin_lock_irq(&d->lock);
933 d->flags |= DEVFL_UP;
934 d->flags &= ~DEVFL_NEWSIZE;
935 spin_unlock_irq(&d->lock);
940 ata_ident_fixstring(u16 *id, int ns)
946 *id++ = s >> 8 | s << 8;
951 ataid_complete(struct aoedev *d, struct aoetgt *t, unsigned char *id)
956 /* word 83: command set supported */
957 n = get_unaligned_le16(&id[83 << 1]);
959 /* word 86: command set/feature enabled */
960 n |= get_unaligned_le16(&id[86 << 1]);
962 if (n & (1<<10)) { /* bit 10: LBA 48 */
963 d->flags |= DEVFL_EXT;
965 /* word 100: number lba48 sectors */
966 ssize = get_unaligned_le64(&id[100 << 1]);
968 /* set as in ide-disk.c:init_idedisk_capacity */
969 d->geo.cylinders = ssize;
970 d->geo.cylinders /= (255 * 63);
974 d->flags &= ~DEVFL_EXT;
976 /* number lba28 sectors */
977 ssize = get_unaligned_le32(&id[60 << 1]);
979 /* NOTE: obsolete in ATA 6 */
980 d->geo.cylinders = get_unaligned_le16(&id[54 << 1]);
981 d->geo.heads = get_unaligned_le16(&id[55 << 1]);
982 d->geo.sectors = get_unaligned_le16(&id[56 << 1]);
985 ata_ident_fixstring((u16 *) &id[10<<1], 10); /* serial */
986 ata_ident_fixstring((u16 *) &id[23<<1], 4); /* firmware */
987 ata_ident_fixstring((u16 *) &id[27<<1], 20); /* model */
988 memcpy(d->ident, id, sizeof(d->ident));
990 if (d->ssize != ssize)
992 "aoe: %pm e%ld.%d v%04x has %llu sectors\n",
994 d->aoemajor, d->aoeminor,
995 d->fw_ver, (long long)ssize);
998 if (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE))
1000 if (d->gd != NULL) {
1001 set_capacity(d->gd, ssize);
1002 d->flags |= DEVFL_NEWSIZE;
1004 d->flags |= DEVFL_GDALLOC;
1005 schedule_work(&d->work);
1009 calc_rttavg(struct aoedev *d, struct aoetgt *t, int rtt)
1015 /* cf. Congestion Avoidance and Control, Jacobson & Karels, 1988 */
1016 n -= d->rttavg >> RTTSCALE;
1020 n -= d->rttdev >> RTTDSCALE;
1023 if (!t || t->maxout >= t->nframes)
1025 if (t->maxout < t->ssthresh)
1027 else if (t->nout == t->maxout && t->next_cwnd-- == 0) {
1029 t->next_cwnd = t->maxout;
1033 static struct aoetgt *
1034 gettgt(struct aoedev *d, char *addr)
1036 struct aoetgt **t, **e;
1039 e = t + d->ntargets;
1040 for (; t < e && *t; t++)
1041 if (memcmp((*t)->addr, addr, sizeof((*t)->addr)) == 0)
1047 bvcpy(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter, long cnt)
1054 __bio_for_each_segment(bv, bio, iter, iter) {
1055 char *p = page_address(bv.bv_page) + bv.bv_offset;
1056 skb_copy_bits(skb, soff, p, bv.bv_len);
1062 aoe_end_request(struct aoedev *d, struct request *rq, int fastfail)
1066 struct request_queue *q;
1073 bok = !fastfail && !bio->bi_status;
1074 } while (__blk_end_request(rq, bok ? BLK_STS_OK : BLK_STS_IOERR, bio->bi_iter.bi_size));
1076 /* cf. http://lkml.org/lkml/2006/10/31/28 */
1082 aoe_end_buf(struct aoedev *d, struct buf *buf)
1087 if (buf == d->ip.buf)
1090 mempool_free(buf, d->bufpool);
1091 n = (unsigned long) rq->special;
1092 rq->special = (void *) --n;
1094 aoe_end_request(d, rq, 0);
1098 ktiocomplete(struct frame *f)
1100 struct aoe_hdr *hin, *hout;
1101 struct aoe_atahdr *ahin, *ahout;
1103 struct sk_buff *skb;
1117 if (f->flags & FFL_PROBE)
1119 if (!skb) /* just fail the buf. */
1122 hout = (struct aoe_hdr *) skb_mac_header(f->skb);
1123 ahout = (struct aoe_atahdr *) (hout+1);
1125 hin = (struct aoe_hdr *) skb->data;
1126 skb_pull(skb, sizeof(*hin));
1127 ahin = (struct aoe_atahdr *) skb->data;
1128 skb_pull(skb, sizeof(*ahin));
1129 if (ahin->cmdstat & 0xa9) { /* these bits cleared on success */
1130 pr_err("aoe: ata error cmd=%2.2Xh stat=%2.2Xh from e%ld.%d\n",
1131 ahout->cmdstat, ahin->cmdstat,
1132 d->aoemajor, d->aoeminor);
1134 buf->bio->bi_status = BLK_STS_IOERR;
1138 n = ahout->scnt << 9;
1139 switch (ahout->cmdstat) {
1140 case ATA_CMD_PIO_READ:
1141 case ATA_CMD_PIO_READ_EXT:
1143 pr_err("%s e%ld.%d. skb->len=%d need=%ld\n",
1144 "aoe: runt data size in read from",
1145 (long) d->aoemajor, d->aoeminor,
1147 buf->bio->bi_status = BLK_STS_IOERR;
1150 if (n > f->iter.bi_size) {
1151 pr_err_ratelimited("%s e%ld.%d. bytes=%ld need=%u\n",
1152 "aoe: too-large data size in read from",
1153 (long) d->aoemajor, d->aoeminor,
1154 n, f->iter.bi_size);
1155 buf->bio->bi_status = BLK_STS_IOERR;
1158 bvcpy(skb, f->buf->bio, f->iter, n);
1159 case ATA_CMD_PIO_WRITE:
1160 case ATA_CMD_PIO_WRITE_EXT:
1161 spin_lock_irq(&d->lock);
1162 ifp = getif(t, skb->dev);
1165 spin_unlock_irq(&d->lock);
1167 case ATA_CMD_ID_ATA:
1168 if (skb->len < 512) {
1169 pr_info("%s e%ld.%d. skb->len=%d need=512\n",
1170 "aoe: runt data size in ataid from",
1171 (long) d->aoemajor, d->aoeminor,
1175 if (skb_linearize(skb))
1177 spin_lock_irq(&d->lock);
1178 ataid_complete(d, t, skb->data);
1179 spin_unlock_irq(&d->lock);
1182 pr_info("aoe: unrecognized ata command %2.2Xh for %d.%d\n",
1184 be16_to_cpu(get_unaligned(&hin->major)),
1188 spin_lock_irq(&d->lock);
1191 && t->nout_probes == 0) {
1192 count_targets(d, &untainted);
1193 if (untainted > 0) {
1201 if (buf && --buf->nframesout == 0 && buf->iter.bi_size == 0)
1202 aoe_end_buf(d, buf);
1204 spin_unlock_irq(&d->lock);
1209 /* Enters with iocq.lock held.
1210 * Returns true iff responses needing processing remain.
1216 struct list_head *pos;
1220 for (i = 0; ; ++i) {
1223 if (list_empty(&iocq[id].head))
1225 pos = iocq[id].head.next;
1227 f = list_entry(pos, struct frame, head);
1228 spin_unlock_irq(&iocq[id].lock);
1231 /* Figure out if extra threads are required. */
1232 actual_id = f->t->d->aoeminor % ncpus;
1234 if (!kts[actual_id].active) {
1236 mutex_lock(&ktio_spawn_lock);
1237 if (!kts[actual_id].active
1238 && aoe_ktstart(&kts[actual_id]) == 0)
1239 kts[actual_id].active = 1;
1240 mutex_unlock(&ktio_spawn_lock);
1242 spin_lock_irq(&iocq[id].lock);
1250 DECLARE_WAITQUEUE(wait, current);
1254 current->flags |= PF_NOFREEZE;
1255 set_user_nice(current, -10);
1256 complete(&k->rendez); /* tell spawner we're running */
1258 spin_lock_irq(k->lock);
1259 more = k->fn(k->id);
1261 add_wait_queue(k->waitq, &wait);
1262 __set_current_state(TASK_INTERRUPTIBLE);
1264 spin_unlock_irq(k->lock);
1267 remove_wait_queue(k->waitq, &wait);
1270 } while (!kthread_should_stop());
1271 complete(&k->rendez); /* tell spawner we're stopping */
1276 aoe_ktstop(struct ktstate *k)
1278 kthread_stop(k->task);
1279 wait_for_completion(&k->rendez);
1283 aoe_ktstart(struct ktstate *k)
1285 struct task_struct *task;
1287 init_completion(&k->rendez);
1288 task = kthread_run(kthread, k, "%s", k->name);
1289 if (task == NULL || IS_ERR(task))
1292 wait_for_completion(&k->rendez); /* allow kthread to start */
1293 init_completion(&k->rendez); /* for waiting for exit later */
1297 /* pass it off to kthreads for processing */
1299 ktcomplete(struct frame *f, struct sk_buff *skb)
1305 id = f->t->d->aoeminor % ncpus;
1306 spin_lock_irqsave(&iocq[id].lock, flags);
1307 if (!kts[id].active) {
1308 spin_unlock_irqrestore(&iocq[id].lock, flags);
1309 /* The thread with id has not been spawned yet,
1310 * so delegate the work to the main thread and
1311 * try spawning a new thread.
1314 spin_lock_irqsave(&iocq[id].lock, flags);
1316 list_add_tail(&f->head, &iocq[id].head);
1317 spin_unlock_irqrestore(&iocq[id].lock, flags);
1318 wake_up(&ktiowq[id]);
1322 aoecmd_ata_rsp(struct sk_buff *skb)
1332 h = (struct aoe_hdr *) skb->data;
1333 aoemajor = be16_to_cpu(get_unaligned(&h->major));
1334 d = aoedev_by_aoeaddr(aoemajor, h->minor, 0);
1336 snprintf(ebuf, sizeof ebuf, "aoecmd_ata_rsp: ata response "
1337 "for unknown device %d.%d\n",
1338 aoemajor, h->minor);
1343 spin_lock_irqsave(&d->lock, flags);
1345 n = be32_to_cpu(get_unaligned(&h->tag));
1348 calc_rttavg(d, f->t, tsince_hr(f));
1350 if (f->flags & FFL_PROBE)
1351 f->t->nout_probes--;
1353 f = getframe_deferred(d, n);
1355 calc_rttavg(d, NULL, tsince_hr(f));
1357 calc_rttavg(d, NULL, tsince(n));
1358 spin_unlock_irqrestore(&d->lock, flags);
1360 snprintf(ebuf, sizeof(ebuf),
1361 "%15s e%d.%d tag=%08x@%08lx s=%pm d=%pm\n",
1363 get_unaligned_be16(&h->major),
1365 get_unaligned_be32(&h->tag),
1375 spin_unlock_irqrestore(&d->lock, flags);
1380 * Note here that we do not perform an aoedev_put, as we are
1381 * leaving this reference for the ktio to release.
1387 aoecmd_cfg(ushort aoemajor, unsigned char aoeminor)
1389 struct sk_buff_head queue;
1391 __skb_queue_head_init(&queue);
1392 aoecmd_cfg_pkts(aoemajor, aoeminor, &queue);
1393 aoenet_xmit(&queue);
1397 aoecmd_ata_id(struct aoedev *d)
1400 struct aoe_atahdr *ah;
1402 struct sk_buff *skb;
1411 /* initialize the headers & frame */
1413 h = (struct aoe_hdr *) skb_mac_header(skb);
1414 ah = (struct aoe_atahdr *) (h+1);
1415 skb_put(skb, sizeof *h + sizeof *ah);
1416 memset(h, 0, skb->len);
1417 f->tag = aoehdr_atainit(d, t, h);
1421 f->waited_total = 0;
1423 /* set up ata header */
1425 ah->cmdstat = ATA_CMD_ID_ATA;
1428 skb->dev = t->ifp->nd;
1430 d->rttavg = RTTAVG_INIT;
1431 d->rttdev = RTTDEV_INIT;
1432 d->timer.function = rexmit_timer;
1434 skb = skb_clone(skb, GFP_ATOMIC);
1436 do_gettimeofday(&f->sent);
1437 f->sent_jiffs = (u32) jiffies;
1443 static struct aoetgt **
1444 grow_targets(struct aoedev *d)
1451 tt = kcalloc(newn, sizeof(*d->targets), GFP_ATOMIC);
1454 memmove(tt, d->targets, sizeof(*d->targets) * oldn);
1455 d->tgt = tt + (d->tgt - d->targets);
1460 return &d->targets[oldn];
1463 static struct aoetgt *
1464 addtgt(struct aoedev *d, char *addr, ulong nframes)
1466 struct aoetgt *t, **tt, **te;
1469 te = tt + d->ntargets;
1470 for (; tt < te && *tt; tt++)
1474 tt = grow_targets(d);
1478 t = kzalloc(sizeof(*t), GFP_ATOMIC);
1481 t->nframes = nframes;
1483 memcpy(t->addr, addr, sizeof t->addr);
1486 t->maxout = t->nframes / 2;
1487 INIT_LIST_HEAD(&t->ffree);
1491 pr_info("aoe: cannot allocate memory to add target\n");
1496 setdbcnt(struct aoedev *d)
1498 struct aoetgt **t, **e;
1502 e = t + d->ntargets;
1503 for (; t < e && *t; t++)
1504 if (bcnt == 0 || bcnt > (*t)->minbcnt)
1505 bcnt = (*t)->minbcnt;
1506 if (bcnt != d->maxbcnt) {
1508 pr_info("aoe: e%ld.%d: setting %d byte data frames\n",
1509 d->aoemajor, d->aoeminor, bcnt);
1514 setifbcnt(struct aoetgt *t, struct net_device *nd, int bcnt)
1517 struct aoeif *p, *e;
1524 for (; p < e; p++) {
1526 break; /* end of the valid interfaces */
1528 p->bcnt = bcnt; /* we're updating */
1530 } else if (minbcnt > p->bcnt)
1531 minbcnt = p->bcnt; /* find the min interface */
1535 pr_err("aoe: device setifbcnt failure; too many interfaces.\n");
1542 t->minbcnt = minbcnt;
1547 aoecmd_cfg_rsp(struct sk_buff *skb)
1551 struct aoe_cfghdr *ch;
1553 ulong flags, aoemajor;
1555 struct sk_buff_head queue;
1559 h = (struct aoe_hdr *) skb_mac_header(skb);
1560 ch = (struct aoe_cfghdr *) (h+1);
1563 * Enough people have their dip switches set backwards to
1564 * warrant a loud message for this special case.
1566 aoemajor = get_unaligned_be16(&h->major);
1567 if (aoemajor == 0xfff) {
1568 printk(KERN_ERR "aoe: Warning: shelf address is all ones. "
1569 "Check shelf dip switches.\n");
1572 if (aoemajor == 0xffff) {
1573 pr_info("aoe: e%ld.%d: broadcast shelf number invalid\n",
1574 aoemajor, (int) h->minor);
1577 if (h->minor == 0xff) {
1578 pr_info("aoe: e%ld.%d: broadcast slot number invalid\n",
1579 aoemajor, (int) h->minor);
1583 n = be16_to_cpu(ch->bufcnt);
1584 if (n > aoe_maxout) /* keep it reasonable */
1587 d = aoedev_by_aoeaddr(aoemajor, h->minor, 1);
1589 pr_info("aoe: device allocation failure\n");
1593 spin_lock_irqsave(&d->lock, flags);
1595 t = gettgt(d, h->src);
1601 t = addtgt(d, h->src, n);
1606 n -= sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr);
1610 n = n ? n * 512 : DEFAULTBCNT;
1611 setifbcnt(t, skb->dev, n);
1613 /* don't change users' perspective */
1614 if (d->nopen == 0) {
1615 d->fw_ver = be16_to_cpu(ch->fwver);
1616 sl = aoecmd_ata_id(d);
1619 spin_unlock_irqrestore(&d->lock, flags);
1622 __skb_queue_head_init(&queue);
1623 __skb_queue_tail(&queue, sl);
1624 aoenet_xmit(&queue);
1629 aoecmd_wreset(struct aoetgt *t)
1632 t->ssthresh = t->nframes / 2;
1633 t->next_cwnd = t->nframes;
1637 aoecmd_cleanslate(struct aoedev *d)
1639 struct aoetgt **t, **te;
1641 d->rttavg = RTTAVG_INIT;
1642 d->rttdev = RTTDEV_INIT;
1646 te = t + d->ntargets;
1647 for (; t < te && *t; t++)
1652 aoe_failbuf(struct aoedev *d, struct buf *buf)
1656 buf->iter.bi_size = 0;
1657 buf->bio->bi_status = BLK_STS_IOERR;
1658 if (buf->nframesout == 0)
1659 aoe_end_buf(d, buf);
1663 aoe_flush_iocq(void)
1667 for (i = 0; i < ncpus; i++) {
1669 aoe_flush_iocq_by_index(i);
1674 aoe_flush_iocq_by_index(int id)
1679 struct list_head *pos;
1680 struct sk_buff *skb;
1683 spin_lock_irqsave(&iocq[id].lock, flags);
1684 list_splice_init(&iocq[id].head, &flist);
1685 spin_unlock_irqrestore(&iocq[id].lock, flags);
1686 while (!list_empty(&flist)) {
1689 f = list_entry(pos, struct frame, head);
1692 spin_lock_irqsave(&d->lock, flags);
1694 f->buf->nframesout--;
1695 aoe_failbuf(d, f->buf);
1698 spin_unlock_irqrestore(&d->lock, flags);
1711 /* get_zeroed_page returns page with ref count 1 */
1712 p = (void *) get_zeroed_page(GFP_KERNEL);
1715 empty_page = virt_to_page(p);
1717 ncpus = num_online_cpus();
1719 iocq = kcalloc(ncpus, sizeof(struct iocq_ktio), GFP_KERNEL);
1723 kts = kcalloc(ncpus, sizeof(struct ktstate), GFP_KERNEL);
1729 ktiowq = kcalloc(ncpus, sizeof(wait_queue_head_t), GFP_KERNEL);
1735 mutex_init(&ktio_spawn_lock);
1737 for (i = 0; i < ncpus; i++) {
1738 INIT_LIST_HEAD(&iocq[i].head);
1739 spin_lock_init(&iocq[i].lock);
1740 init_waitqueue_head(&ktiowq[i]);
1741 snprintf(kts[i].name, sizeof(kts[i].name), "aoe_ktio%d", i);
1743 kts[i].waitq = &ktiowq[i];
1744 kts[i].lock = &iocq[i].lock;
1749 if (aoe_ktstart(&kts[0])) {
1770 for (i = 0; i < ncpus; i++)
1772 aoe_ktstop(&kts[i]);
1776 /* Free up the iocq and thread speicific configuration
1777 * allocated during startup.
1783 free_page((unsigned long) page_address(empty_page));