1 /* Copyright (c) 2007 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 *);
26 static struct buf *nextbuf(struct aoedev *);
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.");
32 static int aoe_maxout = 16;
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.");
37 static wait_queue_head_t ktiowq;
38 static struct ktstate kts;
40 /* io completion queue */
42 struct list_head head;
46 static struct sk_buff *
51 skb = alloc_skb(len, GFP_ATOMIC);
53 skb_reset_mac_header(skb);
54 skb_reset_network_header(skb);
55 skb->protocol = __constant_htons(ETH_P_AOE);
56 skb_checksum_none_assert(skb);
62 getframe(struct aoetgt *t, u32 tag)
65 struct list_head *head, *pos, *nx;
69 head = &t->factive[n];
70 list_for_each_safe(pos, nx, head) {
71 f = list_entry(pos, struct frame, head);
81 * Leave the top bit clear so we have tagspace for userland.
82 * The bottom 16 bits are the xmit tick for rexmit/rttavg processing.
83 * This driver reserves tag -1 to mean "unused frame."
86 newtag(struct aoetgt *t)
91 return n |= (++t->lasttag & 0x7fff) << 16;
95 aoehdr_atainit(struct aoedev *d, struct aoetgt *t, struct aoe_hdr *h)
97 u32 host_tag = newtag(t);
99 memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src);
100 memcpy(h->dst, t->addr, sizeof h->dst);
101 h->type = __constant_cpu_to_be16(ETH_P_AOE);
103 h->major = cpu_to_be16(d->aoemajor);
104 h->minor = d->aoeminor;
106 h->tag = cpu_to_be32(host_tag);
112 put_lba(struct aoe_atahdr *ah, sector_t lba)
115 ah->lba1 = lba >>= 8;
116 ah->lba2 = lba >>= 8;
117 ah->lba3 = lba >>= 8;
118 ah->lba4 = lba >>= 8;
119 ah->lba5 = lba >>= 8;
123 ifrotate(struct aoetgt *t)
126 if (t->ifp >= &t->ifs[NAOEIFS] || t->ifp->nd == NULL)
128 if (t->ifp->nd == NULL) {
129 printk(KERN_INFO "aoe: no interface to rotate to\n");
135 skb_pool_put(struct aoedev *d, struct sk_buff *skb)
137 __skb_queue_tail(&d->skbpool, skb);
140 static struct sk_buff *
141 skb_pool_get(struct aoedev *d)
143 struct sk_buff *skb = skb_peek(&d->skbpool);
145 if (skb && atomic_read(&skb_shinfo(skb)->dataref) == 1) {
146 __skb_unlink(skb, &d->skbpool);
149 if (skb_queue_len(&d->skbpool) < NSKBPOOLMAX &&
150 (skb = new_skb(ETH_ZLEN)))
157 aoe_freetframe(struct frame *f)
165 list_add(&f->head, &t->ffree);
168 static struct frame *
169 newtframe(struct aoedev *d, struct aoetgt *t)
173 struct list_head *pos;
175 if (list_empty(&t->ffree)) {
176 if (t->falloc >= NSKBPOOLMAX*2)
178 f = kcalloc(1, sizeof(*f), GFP_ATOMIC);
186 f = list_entry(pos, struct frame, head);
191 f->skb = skb = new_skb(ETH_ZLEN);
193 bail: aoe_freetframe(f);
198 if (atomic_read(&skb_shinfo(skb)->dataref) != 1) {
199 skb = skb_pool_get(d);
202 skb_pool_put(d, f->skb);
206 skb->truesize -= skb->data_len;
207 skb_shinfo(skb)->nr_frags = skb->data_len = 0;
212 static struct frame *
213 newframe(struct aoedev *d)
216 struct aoetgt *t, **tt;
219 if (d->targets[0] == NULL) { /* shouldn't happen, but I'm paranoid */
220 printk(KERN_ERR "aoe: NULL TARGETS!\n");
223 tt = d->tgt; /* last used target */
226 if (tt >= &d->targets[NTARGETS] || !*tt)
230 if (t->nout < t->maxout
240 if (tt == d->tgt) /* we've looped and found nada */
245 d->flags |= DEVFL_KICKME;
251 skb_fillup(struct sk_buff *skb, struct bio_vec *bv, ulong off, ulong cnt)
256 fcnt = bv->bv_len - (off - bv->bv_offset);
259 skb_fill_page_desc(skb, frag++, bv->bv_page, off, fcnt);
269 fhash(struct frame *f)
271 struct aoetgt *t = f->t;
274 n = f->tag % NFACTIVE;
275 list_add_tail(&f->head, &t->factive[n]);
279 aoecmd_ata_rw(struct aoedev *d)
283 struct aoe_atahdr *ah;
288 struct sk_buff_head queue;
290 char writebit, extbit;
303 bcnt = t->ifp->maxbcnt;
306 if (bcnt > buf->resid)
310 f->bv_off = f->bv->bv_offset + (f->bv->bv_len - buf->bv_resid);
312 if (fbcnt < buf->bv_resid) {
313 buf->bv_resid -= fbcnt;
317 fbcnt -= buf->bv_resid;
318 buf->resid -= buf->bv_resid;
319 if (buf->resid == 0) {
324 buf->bv_resid = buf->bv->bv_len;
325 WARN_ON(buf->bv_resid == 0);
328 /* initialize the headers & frame */
330 h = (struct aoe_hdr *) skb_mac_header(skb);
331 ah = (struct aoe_atahdr *) (h+1);
332 skb_put(skb, sizeof *h + sizeof *ah);
333 memset(h, 0, skb->len);
334 f->tag = aoehdr_atainit(d, t, h);
340 f->lba = buf->sector;
342 /* set up ata header */
343 ah->scnt = bcnt >> 9;
344 put_lba(ah, buf->sector);
345 if (d->flags & DEVFL_EXT) {
346 ah->aflags |= AOEAFL_EXT;
350 ah->lba3 |= 0xe0; /* LBA bit + obsolete 0xa0 */
352 if (bio_data_dir(buf->bio) == WRITE) {
353 skb_fillup(skb, f->bv, f->bv_off, bcnt);
354 ah->aflags |= AOEAFL_WRITE;
356 skb->data_len = bcnt;
357 skb->truesize += bcnt;
364 ah->cmdstat = ATA_CMD_PIO_READ | writebit | extbit;
366 /* mark all tracking fields and load out */
367 buf->nframesout += 1;
368 buf->sector += bcnt >> 9;
370 skb->dev = t->ifp->nd;
371 skb = skb_clone(skb, GFP_ATOMIC);
373 __skb_queue_head_init(&queue);
374 __skb_queue_tail(&queue, skb);
380 /* some callers cannot sleep, and they can call this function,
381 * transmitting the packets later, when interrupts are on
384 aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff_head *queue)
387 struct aoe_cfghdr *ch;
389 struct net_device *ifp;
392 for_each_netdev_rcu(&init_net, ifp) {
394 if (!is_aoe_netif(ifp))
397 skb = new_skb(sizeof *h + sizeof *ch);
399 printk(KERN_INFO "aoe: skb alloc failure\n");
402 skb_put(skb, sizeof *h + sizeof *ch);
404 __skb_queue_tail(queue, skb);
405 h = (struct aoe_hdr *) skb_mac_header(skb);
406 memset(h, 0, sizeof *h + sizeof *ch);
408 memset(h->dst, 0xff, sizeof h->dst);
409 memcpy(h->src, ifp->dev_addr, sizeof h->src);
410 h->type = __constant_cpu_to_be16(ETH_P_AOE);
412 h->major = cpu_to_be16(aoemajor);
423 resend(struct aoedev *d, struct frame *f)
426 struct sk_buff_head queue;
428 struct aoe_atahdr *ah;
437 h = (struct aoe_hdr *) skb_mac_header(skb);
438 ah = (struct aoe_atahdr *) (h+1);
440 snprintf(buf, sizeof buf,
441 "%15s e%ld.%d oldtag=%08x@%08lx newtag=%08x s=%pm d=%pm nout=%d\n",
442 "retransmit", d->aoemajor, d->aoeminor, f->tag, jiffies, n,
443 h->src, h->dst, t->nout);
448 h->tag = cpu_to_be32(n);
449 memcpy(h->dst, t->addr, sizeof h->dst);
450 memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src);
452 skb->dev = t->ifp->nd;
453 skb = skb_clone(skb, GFP_ATOMIC);
456 __skb_queue_head_init(&queue);
457 __skb_queue_tail(&queue, skb);
466 n = jiffies & 0xffff;
473 static struct aoeif *
474 getif(struct aoetgt *t, struct net_device *nd)
486 static struct aoeif *
487 addif(struct aoetgt *t, struct net_device *nd)
495 p->maxbcnt = DEFAULTBCNT;
502 ejectif(struct aoetgt *t, struct aoeif *ifp)
507 e = t->ifs + NAOEIFS - 1;
508 n = (e - ifp) * sizeof *ifp;
509 memmove(ifp, ifp+1, n);
514 sthtith(struct aoedev *d)
516 struct frame *f, *nf;
517 struct list_head *nx, *pos, *head;
519 struct aoetgt *ht = d->htgt;
522 for (i = 0; i < NFACTIVE; i++) {
523 head = &ht->factive[i];
524 list_for_each_safe(pos, nx, head) {
525 f = list_entry(pos, struct frame, head);
530 /* remove frame from active list */
533 /* reassign all pertinent bits to new outbound frame */
540 nf->bv_off = f->bv_off;
549 /* he's clean, he's useless. take away his interfaces */
550 memset(ht->ifs, 0, sizeof ht->ifs);
555 static inline unsigned char
556 ata_scnt(unsigned char *packet) {
558 struct aoe_atahdr *ah;
560 h = (struct aoe_hdr *) packet;
561 ah = (struct aoe_atahdr *) (h+1);
566 rexmit_timer(ulong vp)
569 struct aoetgt *t, **tt, **te;
572 struct list_head *head, *pos, *nx;
574 register long timeout;
578 d = (struct aoedev *) vp;
580 /* timeout is always ~150% of the moving average */
582 timeout += timeout >> 1;
584 spin_lock_irqsave(&d->lock, flags);
586 if (d->flags & DEVFL_TKILL) {
587 spin_unlock_irqrestore(&d->lock, flags);
591 /* collect all frames to rexmit into flist */
594 for (; tt < te && *tt; tt++) {
596 for (i = 0; i < NFACTIVE; i++) {
597 head = &t->factive[i];
598 list_for_each_safe(pos, nx, head) {
599 f = list_entry(pos, struct frame, head);
600 if (tsince(f->tag) < timeout)
602 /* move to flist for later processing */
603 list_move_tail(pos, &flist);
608 if (t->nout == t->maxout
609 && t->maxout < t->nframes
610 && (jiffies - t->lastwadj)/HZ > 10) {
612 t->lastwadj = jiffies;
616 if (!list_empty(&flist)) { /* retransmissions necessary */
619 d->rttavg = MAXTIMER;
622 /* process expired frames */
623 while (!list_empty(&flist)) {
625 f = list_entry(pos, struct frame, head);
626 n = f->waited += timeout;
628 if (n > aoe_deadsecs) {
629 /* Waited too long. Device failure.
630 * Hang all frames on first hash bucket for downdev
633 list_splice(&flist, &f->t->factive[0]);
641 /* see if another target can help */
645 if (t->nout == t->maxout) {
648 t->lastwadj = jiffies;
651 ifp = getif(t, f->skb->dev);
652 if (ifp && ++ifp->lost > (t->nframes << 1)
653 && (ifp != t->ifs || t->ifs[1].nd)) {
660 if ((d->flags & DEVFL_KICKME || d->htgt) && d->blkq) {
661 d->flags &= ~DEVFL_KICKME;
662 d->blkq->request_fn(d->blkq);
665 d->timer.expires = jiffies + TIMERTICK;
666 add_timer(&d->timer);
668 spin_unlock_irqrestore(&d->lock, flags);
672 rqbiocnt(struct request *r)
677 __rq_for_each_bio(bio, r)
682 /* This can be removed if we are certain that no users of the block
683 * layer will ever use zero-count pages in bios. Otherwise we have to
684 * protect against the put_page sometimes done by the network layer.
686 * See http://oss.sgi.com/archives/xfs/2007-01/msg00594.html for
689 * We cannot use get_page in the workaround, because it insists on a
690 * positive page count as a precondition. So we use _count directly.
693 bio_pageinc(struct bio *bio)
699 bio_for_each_segment(bv, bio, i) {
701 /* Non-zero page count for non-head members of
702 * compound pages is no longer allowed by the kernel,
703 * but this has never been seen here.
705 if (unlikely(PageCompound(page)))
706 if (compound_trans_head(page) != page) {
707 pr_crit("page tail used for block I/O\n");
710 atomic_inc(&page->_count);
715 bio_pagedec(struct bio *bio)
720 bio_for_each_segment(bv, bio, i)
721 atomic_dec(&bv->bv_page->_count);
725 bufinit(struct buf *buf, struct request *rq, struct bio *bio)
729 memset(buf, 0, sizeof(*buf));
732 buf->resid = bio->bi_size;
733 buf->sector = bio->bi_sector;
735 buf->bv = bv = &bio->bi_io_vec[bio->bi_idx];
736 buf->bv_resid = bv->bv_len;
737 WARN_ON(buf->bv_resid == 0);
741 nextbuf(struct aoedev *d)
744 struct request_queue *q;
750 return NULL; /* initializing */
755 rq = blk_peek_request(q);
758 blk_start_request(rq);
760 d->ip.nxbio = rq->bio;
761 rq->special = (void *) rqbiocnt(rq);
763 buf = mempool_alloc(d->bufpool, GFP_ATOMIC);
765 pr_err("aoe: nextbuf: unable to mempool_alloc!\n");
769 bufinit(buf, rq, bio);
774 return d->ip.buf = buf;
777 /* enters with d->lock held */
779 aoecmd_work(struct aoedev *d)
781 if (d->htgt && !sthtith(d))
783 while (aoecmd_ata_rw(d))
787 /* this function performs work that has been deferred until sleeping is OK
790 aoecmd_sleepwork(struct work_struct *work)
792 struct aoedev *d = container_of(work, struct aoedev, work);
794 if (d->flags & DEVFL_GDALLOC)
797 if (d->flags & DEVFL_NEWSIZE) {
798 struct block_device *bd;
802 ssize = get_capacity(d->gd);
803 bd = bdget_disk(d->gd, 0);
806 mutex_lock(&bd->bd_inode->i_mutex);
807 i_size_write(bd->bd_inode, (loff_t)ssize<<9);
808 mutex_unlock(&bd->bd_inode->i_mutex);
811 spin_lock_irqsave(&d->lock, flags);
812 d->flags |= DEVFL_UP;
813 d->flags &= ~DEVFL_NEWSIZE;
814 spin_unlock_irqrestore(&d->lock, flags);
819 ataid_complete(struct aoedev *d, struct aoetgt *t, unsigned char *id)
824 /* word 83: command set supported */
825 n = get_unaligned_le16(&id[83 << 1]);
827 /* word 86: command set/feature enabled */
828 n |= get_unaligned_le16(&id[86 << 1]);
830 if (n & (1<<10)) { /* bit 10: LBA 48 */
831 d->flags |= DEVFL_EXT;
833 /* word 100: number lba48 sectors */
834 ssize = get_unaligned_le64(&id[100 << 1]);
836 /* set as in ide-disk.c:init_idedisk_capacity */
837 d->geo.cylinders = ssize;
838 d->geo.cylinders /= (255 * 63);
842 d->flags &= ~DEVFL_EXT;
844 /* number lba28 sectors */
845 ssize = get_unaligned_le32(&id[60 << 1]);
847 /* NOTE: obsolete in ATA 6 */
848 d->geo.cylinders = get_unaligned_le16(&id[54 << 1]);
849 d->geo.heads = get_unaligned_le16(&id[55 << 1]);
850 d->geo.sectors = get_unaligned_le16(&id[56 << 1]);
853 if (d->ssize != ssize)
855 "aoe: %pm e%ld.%d v%04x has %llu sectors\n",
857 d->aoemajor, d->aoeminor,
858 d->fw_ver, (long long)ssize);
861 if (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE))
864 set_capacity(d->gd, ssize);
865 d->flags |= DEVFL_NEWSIZE;
867 d->flags |= DEVFL_GDALLOC;
868 schedule_work(&d->work);
872 calc_rttavg(struct aoedev *d, int rtt)
881 else if (n > MAXTIMER)
883 d->mintimer += (n - d->mintimer) >> 1;
884 } else if (n < d->mintimer)
886 else if (n > MAXTIMER)
889 /* g == .25; cf. Congestion Avoidance and Control, Jacobson & Karels; 1988 */
894 static struct aoetgt *
895 gettgt(struct aoedev *d, char *addr)
897 struct aoetgt **t, **e;
901 for (; t < e && *t; t++)
902 if (memcmp((*t)->addr, addr, sizeof((*t)->addr)) == 0)
908 bvcpy(struct bio_vec *bv, ulong off, struct sk_buff *skb, long cnt)
914 fcnt = bv->bv_len - (off - bv->bv_offset);
917 p = page_address(bv->bv_page) + off;
918 skb_copy_bits(skb, soff, p, fcnt);
929 aoe_end_request(struct aoedev *d, struct request *rq, int fastfail)
933 struct request_queue *q;
940 bok = !fastfail && test_bit(BIO_UPTODATE, &bio->bi_flags);
941 } while (__blk_end_request(rq, bok ? 0 : -EIO, bio->bi_size));
943 /* cf. http://lkml.org/lkml/2006/10/31/28 */
949 aoe_end_buf(struct aoedev *d, struct buf *buf)
954 if (buf == d->ip.buf)
957 bio_pagedec(buf->bio);
958 mempool_free(buf, d->bufpool);
959 n = (unsigned long) rq->special;
960 rq->special = (void *) --n;
962 aoe_end_request(d, rq, 0);
966 ktiocomplete(struct frame *f)
968 struct aoe_hdr *hin, *hout;
969 struct aoe_atahdr *ahin, *ahout;
983 hout = (struct aoe_hdr *) skb_mac_header(f->skb);
984 ahout = (struct aoe_atahdr *) (hout+1);
988 goto noskb; /* just fail the buf. */
990 hin = (struct aoe_hdr *) skb->data;
991 skb_pull(skb, sizeof(*hin));
992 ahin = (struct aoe_atahdr *) skb->data;
993 skb_pull(skb, sizeof(*ahin));
994 if (ahin->cmdstat & 0xa9) { /* these bits cleared on success */
995 pr_err("aoe: ata error cmd=%2.2Xh stat=%2.2Xh from e%ld.%d\n",
996 ahout->cmdstat, ahin->cmdstat,
997 d->aoemajor, d->aoeminor);
999 clear_bit(BIO_UPTODATE, &buf->bio->bi_flags);
1003 n = ahout->scnt << 9;
1004 switch (ahout->cmdstat) {
1005 case ATA_CMD_PIO_READ:
1006 case ATA_CMD_PIO_READ_EXT:
1008 pr_err("aoe: runt data size in read. skb->len=%d need=%ld\n",
1010 clear_bit(BIO_UPTODATE, &buf->bio->bi_flags);
1013 bvcpy(f->bv, f->bv_off, skb, n);
1014 case ATA_CMD_PIO_WRITE:
1015 case ATA_CMD_PIO_WRITE_EXT:
1016 spin_lock_irq(&d->lock);
1017 ifp = getif(t, skb->dev);
1020 if (n > DEFAULTBCNT)
1023 if (d->htgt == t) /* I'll help myself, thank you. */
1025 spin_unlock_irq(&d->lock);
1027 case ATA_CMD_ID_ATA:
1028 if (skb->len < 512) {
1029 pr_info("aoe: runt data size in ataid. skb->len=%d\n",
1033 if (skb_linearize(skb))
1035 spin_lock_irq(&d->lock);
1036 ataid_complete(d, t, skb->data);
1037 spin_unlock_irq(&d->lock);
1040 pr_info("aoe: unrecognized ata command %2.2Xh for %d.%d\n",
1042 be16_to_cpu(get_unaligned(&hin->major)),
1046 spin_lock_irq(&d->lock);
1050 if (buf && --buf->nframesout == 0 && buf->resid == 0)
1051 aoe_end_buf(d, buf);
1055 spin_unlock_irq(&d->lock);
1060 /* Enters with iocq.lock held.
1061 * Returns true iff responses needing processing remain.
1067 struct list_head *pos;
1070 for (i = 0; ; ++i) {
1073 if (list_empty(&iocq.head))
1075 pos = iocq.head.next;
1077 spin_unlock_irq(&iocq.lock);
1078 f = list_entry(pos, struct frame, head);
1080 spin_lock_irq(&iocq.lock);
1088 DECLARE_WAITQUEUE(wait, current);
1092 current->flags |= PF_NOFREEZE;
1093 set_user_nice(current, -10);
1094 complete(&k->rendez); /* tell spawner we're running */
1096 spin_lock_irq(k->lock);
1099 add_wait_queue(k->waitq, &wait);
1100 __set_current_state(TASK_INTERRUPTIBLE);
1102 spin_unlock_irq(k->lock);
1105 remove_wait_queue(k->waitq, &wait);
1108 } while (!kthread_should_stop());
1109 complete(&k->rendez); /* tell spawner we're stopping */
1114 aoe_ktstop(struct ktstate *k)
1116 kthread_stop(k->task);
1117 wait_for_completion(&k->rendez);
1121 aoe_ktstart(struct ktstate *k)
1123 struct task_struct *task;
1125 init_completion(&k->rendez);
1126 task = kthread_run(kthread, k, k->name);
1127 if (task == NULL || IS_ERR(task))
1130 wait_for_completion(&k->rendez); /* allow kthread to start */
1131 init_completion(&k->rendez); /* for waiting for exit later */
1135 /* pass it off to kthreads for processing */
1137 ktcomplete(struct frame *f, struct sk_buff *skb)
1142 spin_lock_irqsave(&iocq.lock, flags);
1143 list_add_tail(&f->head, &iocq.head);
1144 spin_unlock_irqrestore(&iocq.lock, flags);
1149 aoecmd_ata_rsp(struct sk_buff *skb)
1160 h = (struct aoe_hdr *) skb->data;
1161 aoemajor = be16_to_cpu(get_unaligned(&h->major));
1162 d = aoedev_by_aoeaddr(aoemajor, h->minor);
1164 snprintf(ebuf, sizeof ebuf, "aoecmd_ata_rsp: ata response "
1165 "for unknown device %d.%d\n",
1166 aoemajor, h->minor);
1171 spin_lock_irqsave(&d->lock, flags);
1173 n = be32_to_cpu(get_unaligned(&h->tag));
1174 t = gettgt(d, h->src);
1176 printk(KERN_INFO "aoe: can't find target e%ld.%d:%pm\n",
1177 d->aoemajor, d->aoeminor, h->src);
1178 spin_unlock_irqrestore(&d->lock, flags);
1184 calc_rttavg(d, -tsince(n));
1185 spin_unlock_irqrestore(&d->lock, flags);
1187 snprintf(ebuf, sizeof ebuf,
1188 "%15s e%d.%d tag=%08x@%08lx\n",
1190 get_unaligned_be16(&h->major),
1192 get_unaligned_be32(&h->tag),
1197 calc_rttavg(d, tsince(f->tag));
1201 spin_unlock_irqrestore(&d->lock, flags);
1206 * Note here that we do not perform an aoedev_put, as we are
1207 * leaving this reference for the ktio to release.
1213 aoecmd_cfg(ushort aoemajor, unsigned char aoeminor)
1215 struct sk_buff_head queue;
1217 __skb_queue_head_init(&queue);
1218 aoecmd_cfg_pkts(aoemajor, aoeminor, &queue);
1219 aoenet_xmit(&queue);
1223 aoecmd_ata_id(struct aoedev *d)
1226 struct aoe_atahdr *ah;
1228 struct sk_buff *skb;
1237 /* initialize the headers & frame */
1239 h = (struct aoe_hdr *) skb_mac_header(skb);
1240 ah = (struct aoe_atahdr *) (h+1);
1241 skb_put(skb, sizeof *h + sizeof *ah);
1242 memset(h, 0, skb->len);
1243 f->tag = aoehdr_atainit(d, t, h);
1248 /* set up ata header */
1250 ah->cmdstat = ATA_CMD_ID_ATA;
1253 skb->dev = t->ifp->nd;
1255 d->rttavg = MAXTIMER;
1256 d->timer.function = rexmit_timer;
1258 return skb_clone(skb, GFP_ATOMIC);
1261 static struct aoetgt *
1262 addtgt(struct aoedev *d, char *addr, ulong nframes)
1264 struct aoetgt *t, **tt, **te;
1269 for (; tt < te && *tt; tt++)
1274 "aoe: device addtgt failure; too many targets\n");
1277 t = kzalloc(sizeof(*t), GFP_ATOMIC);
1279 printk(KERN_INFO "aoe: cannot allocate memory to add target\n");
1284 t->nframes = nframes;
1286 memcpy(t->addr, addr, sizeof t->addr);
1288 t->maxout = t->nframes;
1289 INIT_LIST_HEAD(&t->ffree);
1290 for (i = 0; i < NFACTIVE; ++i)
1291 INIT_LIST_HEAD(&t->factive[i]);
1296 aoecmd_cfg_rsp(struct sk_buff *skb)
1300 struct aoe_cfghdr *ch;
1303 ulong flags, sysminor, aoemajor;
1305 struct sk_buff_head queue;
1309 h = (struct aoe_hdr *) skb_mac_header(skb);
1310 ch = (struct aoe_cfghdr *) (h+1);
1313 * Enough people have their dip switches set backwards to
1314 * warrant a loud message for this special case.
1316 aoemajor = get_unaligned_be16(&h->major);
1317 if (aoemajor == 0xfff) {
1318 printk(KERN_ERR "aoe: Warning: shelf address is all ones. "
1319 "Check shelf dip switches.\n");
1323 sysminor = SYSMINOR(aoemajor, h->minor);
1324 if (sysminor * AOE_PARTITIONS + AOE_PARTITIONS > MINORMASK) {
1325 printk(KERN_INFO "aoe: e%ld.%d: minor number too large\n",
1326 aoemajor, (int) h->minor);
1330 n = be16_to_cpu(ch->bufcnt);
1331 if (n > aoe_maxout) /* keep it reasonable */
1334 d = aoedev_by_sysminor_m(sysminor);
1336 printk(KERN_INFO "aoe: device sysminor_m failure\n");
1340 spin_lock_irqsave(&d->lock, flags);
1342 t = gettgt(d, h->src);
1344 t = addtgt(d, h->src, n);
1348 ifp = getif(t, skb->dev);
1350 ifp = addif(t, skb->dev);
1353 "aoe: device addif failure; "
1354 "too many interfaces?\n");
1360 n -= sizeof (struct aoe_hdr) + sizeof (struct aoe_atahdr);
1364 n = n ? n * 512 : DEFAULTBCNT;
1365 if (n != ifp->maxbcnt) {
1367 "aoe: e%ld.%d: setting %d%s%s:%pm\n",
1368 d->aoemajor, d->aoeminor, n,
1369 " byte data frames on ", ifp->nd->name,
1375 /* don't change users' perspective */
1376 if (d->nopen == 0) {
1377 d->fw_ver = be16_to_cpu(ch->fwver);
1378 sl = aoecmd_ata_id(d);
1381 spin_unlock_irqrestore(&d->lock, flags);
1384 __skb_queue_head_init(&queue);
1385 __skb_queue_tail(&queue, sl);
1386 aoenet_xmit(&queue);
1391 aoecmd_cleanslate(struct aoedev *d)
1393 struct aoetgt **t, **te;
1394 struct aoeif *p, *e;
1396 d->mintimer = MINTIMER;
1400 for (; t < te && *t; t++) {
1401 (*t)->maxout = (*t)->nframes;
1404 for (; p < e; p++) {
1407 p->maxbcnt = DEFAULTBCNT;
1413 aoe_failbuf(struct aoedev *d, struct buf *buf)
1418 clear_bit(BIO_UPTODATE, &buf->bio->bi_flags);
1419 if (buf->nframesout == 0)
1420 aoe_end_buf(d, buf);
1424 aoe_flush_iocq(void)
1429 struct list_head *pos;
1430 struct sk_buff *skb;
1433 spin_lock_irqsave(&iocq.lock, flags);
1434 list_splice_init(&iocq.head, &flist);
1435 spin_unlock_irqrestore(&iocq.lock, flags);
1436 while (!list_empty(&flist)) {
1439 f = list_entry(pos, struct frame, head);
1442 spin_lock_irqsave(&d->lock, flags);
1444 f->buf->nframesout--;
1445 aoe_failbuf(d, f->buf);
1448 spin_unlock_irqrestore(&d->lock, flags);
1457 INIT_LIST_HEAD(&iocq.head);
1458 spin_lock_init(&iocq.lock);
1459 init_waitqueue_head(&ktiowq);
1460 kts.name = "aoe_ktio";
1462 kts.waitq = &ktiowq;
1463 kts.lock = &iocq.lock;
1464 return aoe_ktstart(&kts);