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/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> 20 #include "aoe.h" 21 22 #define MAXIOC (8192) /* default meant to avoid most soft lockups */ 23 24 static void ktcomplete(struct frame *, struct sk_buff *); 25 static int count_targets(struct aoedev *d, int *untainted); 26 27 static struct buf *nextbuf(struct aoedev *); 28 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."); 32 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."); 37 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. 44 */ 45 static int ncpus; 46 47 /* mutex lock used for synchronization while thread spawning */ 48 static DEFINE_MUTEX(ktio_spawn_lock); 49 50 static wait_queue_head_t *ktiowq; 51 static struct ktstate *kts; 52 53 /* io completion queue */ 54 struct iocq_ktio { 55 struct list_head head; 56 spinlock_t lock; 57 }; 58 static struct iocq_ktio *iocq; 59 60 static struct page *empty_page; 61 62 static struct sk_buff * 63 new_skb(ulong len) 64 { 65 struct sk_buff *skb; 66 67 skb = alloc_skb(len + MAX_HEADER, GFP_ATOMIC); 68 if (skb) { 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); 74 } 75 return skb; 76 } 77 78 static struct frame * 79 getframe_deferred(struct aoedev *d, u32 tag) 80 { 81 struct list_head *head, *pos, *nx; 82 struct frame *f; 83 84 head = &d->rexmitq; 85 list_for_each_safe(pos, nx, head) { 86 f = list_entry(pos, struct frame, head); 87 if (f->tag == tag) { 88 list_del(pos); 89 return f; 90 } 91 } 92 return NULL; 93 } 94 95 static struct frame * 96 getframe(struct aoedev *d, u32 tag) 97 { 98 struct frame *f; 99 struct list_head *head, *pos, *nx; 100 u32 n; 101 102 n = tag % NFACTIVE; 103 head = &d->factive[n]; 104 list_for_each_safe(pos, nx, head) { 105 f = list_entry(pos, struct frame, head); 106 if (f->tag == tag) { 107 list_del(pos); 108 return f; 109 } 110 } 111 return NULL; 112 } 113 114 /* 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." 118 */ 119 static int 120 newtag(struct aoedev *d) 121 { 122 register ulong n; 123 124 n = jiffies & 0xffff; 125 return n |= (++d->lasttag & 0x7fff) << 16; 126 } 127 128 static u32 129 aoehdr_atainit(struct aoedev *d, struct aoetgt *t, struct aoe_hdr *h) 130 { 131 u32 host_tag = newtag(d); 132 133 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); 136 h->verfl = AOE_HVER; 137 h->major = cpu_to_be16(d->aoemajor); 138 h->minor = d->aoeminor; 139 h->cmd = AOECMD_ATA; 140 h->tag = cpu_to_be32(host_tag); 141 142 return host_tag; 143 } 144 145 static inline void 146 put_lba(struct aoe_atahdr *ah, sector_t lba) 147 { 148 ah->lba0 = 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; 154 } 155 156 static struct aoeif * 157 ifrotate(struct aoetgt *t) 158 { 159 struct aoeif *ifp; 160 161 ifp = t->ifp; 162 ifp++; 163 if (ifp >= &t->ifs[NAOEIFS] || ifp->nd == NULL) 164 ifp = t->ifs; 165 if (ifp->nd == NULL) 166 return NULL; 167 return t->ifp = ifp; 168 } 169 170 static void 171 skb_pool_put(struct aoedev *d, struct sk_buff *skb) 172 { 173 __skb_queue_tail(&d->skbpool, skb); 174 } 175 176 static struct sk_buff * 177 skb_pool_get(struct aoedev *d) 178 { 179 struct sk_buff *skb = skb_peek(&d->skbpool); 180 181 if (skb && atomic_read(&skb_shinfo(skb)->dataref) == 1) { 182 __skb_unlink(skb, &d->skbpool); 183 return skb; 184 } 185 if (skb_queue_len(&d->skbpool) < NSKBPOOLMAX && 186 (skb = new_skb(ETH_ZLEN))) 187 return skb; 188 189 return NULL; 190 } 191 192 void 193 aoe_freetframe(struct frame *f) 194 { 195 struct aoetgt *t; 196 197 t = f->t; 198 f->buf = NULL; 199 memset(&f->iter, 0, sizeof(f->iter)); 200 f->r_skb = NULL; 201 f->flags = 0; 202 list_add(&f->head, &t->ffree); 203 } 204 205 static struct frame * 206 newtframe(struct aoedev *d, struct aoetgt *t) 207 { 208 struct frame *f; 209 struct sk_buff *skb; 210 struct list_head *pos; 211 212 if (list_empty(&t->ffree)) { 213 if (t->falloc >= NSKBPOOLMAX*2) 214 return NULL; 215 f = kcalloc(1, sizeof(*f), GFP_ATOMIC); 216 if (f == NULL) 217 return NULL; 218 t->falloc++; 219 f->t = t; 220 } else { 221 pos = t->ffree.next; 222 list_del(pos); 223 f = list_entry(pos, struct frame, head); 224 } 225 226 skb = f->skb; 227 if (skb == NULL) { 228 f->skb = skb = new_skb(ETH_ZLEN); 229 if (!skb) { 230 bail: aoe_freetframe(f); 231 return NULL; 232 } 233 } 234 235 if (atomic_read(&skb_shinfo(skb)->dataref) != 1) { 236 skb = skb_pool_get(d); 237 if (skb == NULL) 238 goto bail; 239 skb_pool_put(d, f->skb); 240 f->skb = skb; 241 } 242 243 skb->truesize -= skb->data_len; 244 skb_shinfo(skb)->nr_frags = skb->data_len = 0; 245 skb_trim(skb, 0); 246 return f; 247 } 248 249 static struct frame * 250 newframe(struct aoedev *d) 251 { 252 struct frame *f; 253 struct aoetgt *t, **tt; 254 int totout = 0; 255 int use_tainted; 256 int has_untainted; 257 258 if (!d->targets || !d->targets[0]) { 259 printk(KERN_ERR "aoe: NULL TARGETS!\n"); 260 return NULL; 261 } 262 tt = d->tgt; /* last used target */ 263 for (use_tainted = 0, has_untainted = 0;;) { 264 tt++; 265 if (tt >= &d->targets[d->ntargets] || !*tt) 266 tt = d->targets; 267 t = *tt; 268 if (!t->taint) { 269 has_untainted = 1; 270 totout += t->nout; 271 } 272 if (t->nout < t->maxout 273 && (use_tainted || !t->taint) 274 && t->ifp->nd) { 275 f = newtframe(d, t); 276 if (f) { 277 ifrotate(t); 278 d->tgt = tt; 279 return f; 280 } 281 } 282 if (tt == d->tgt) { /* we've looped and found nada */ 283 if (!use_tainted && !has_untainted) 284 use_tainted = 1; 285 else 286 break; 287 } 288 } 289 if (totout == 0) { 290 d->kicked++; 291 d->flags |= DEVFL_KICKME; 292 } 293 return NULL; 294 } 295 296 static void 297 skb_fillup(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter) 298 { 299 int frag = 0; 300 struct bio_vec bv; 301 302 __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); 305 } 306 307 static void 308 fhash(struct frame *f) 309 { 310 struct aoedev *d = f->t->d; 311 u32 n; 312 313 n = f->tag % NFACTIVE; 314 list_add_tail(&f->head, &d->factive[n]); 315 } 316 317 static void 318 ata_rw_frameinit(struct frame *f) 319 { 320 struct aoetgt *t; 321 struct aoe_hdr *h; 322 struct aoe_atahdr *ah; 323 struct sk_buff *skb; 324 char writebit, extbit; 325 326 skb = f->skb; 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); 331 332 writebit = 0x10; 333 extbit = 0x4; 334 335 t = f->t; 336 f->tag = aoehdr_atainit(t->d, t, h); 337 fhash(f); 338 t->nout++; 339 f->waited = 0; 340 f->waited_total = 0; 341 342 /* 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; 347 } else { 348 extbit = 0; 349 ah->lba3 &= 0x0f; 350 ah->lba3 |= 0xe0; /* LBA bit + obsolete 0xa0 */ 351 } 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; 358 t->wpkts++; 359 } else { 360 t->rpkts++; 361 writebit = 0; 362 } 363 364 ah->cmdstat = ATA_CMD_PIO_READ | writebit | extbit; 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 } 406 return 1; 407 } 408 409 /* some callers cannot sleep, and they can call this function, 410 * transmitting the packets later, when interrupts are on 411 */ 412 static void 413 aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff_head *queue) 414 { 415 struct aoe_hdr *h; 416 struct aoe_cfghdr *ch; 417 struct sk_buff *skb; 418 struct net_device *ifp; 419 420 rcu_read_lock(); 421 for_each_netdev_rcu(&init_net, ifp) { 422 dev_hold(ifp); 423 if (!is_aoe_netif(ifp)) 424 goto cont; 425 426 skb = new_skb(sizeof *h + sizeof *ch); 427 if (skb == NULL) { 428 printk(KERN_INFO "aoe: skb alloc failure\n"); 429 goto cont; 430 } 431 skb_put(skb, sizeof *h + sizeof *ch); 432 skb->dev = ifp; 433 __skb_queue_tail(queue, skb); 434 h = (struct aoe_hdr *) skb_mac_header(skb); 435 memset(h, 0, sizeof *h + sizeof *ch); 436 437 memset(h->dst, 0xff, sizeof h->dst); 438 memcpy(h->src, ifp->dev_addr, sizeof h->src); 439 h->type = __constant_cpu_to_be16(ETH_P_AOE); 440 h->verfl = AOE_HVER; 441 h->major = cpu_to_be16(aoemajor); 442 h->minor = aoeminor; 443 h->cmd = AOECMD_CFG; 444 445 cont: 446 dev_put(ifp); 447 } 448 rcu_read_unlock(); 449 } 450 451 static void 452 resend(struct aoedev *d, struct frame *f) 453 { 454 struct sk_buff *skb; 455 struct sk_buff_head queue; 456 struct aoe_hdr *h; 457 struct aoetgt *t; 458 char buf[128]; 459 u32 n; 460 461 t = f->t; 462 n = newtag(d); 463 skb = f->skb; 464 if (ifrotate(t) == NULL) { 465 /* probably can't happen, but set it up to fail anyway */ 466 pr_info("aoe: resend: no interfaces to rotate to.\n"); 467 ktcomplete(f, NULL); 468 return; 469 } 470 h = (struct aoe_hdr *) skb_mac_header(skb); 471 472 if (!(f->flags & FFL_PROBE)) { 473 snprintf(buf, sizeof(buf), 474 "%15s e%ld.%d oldtag=%08x@%08lx newtag=%08x s=%pm d=%pm nout=%d\n", 475 "retransmit", d->aoemajor, d->aoeminor, 476 f->tag, jiffies, n, 477 h->src, h->dst, t->nout); 478 aoechr_error(buf); 479 } 480 481 f->tag = n; 482 fhash(f); 483 h->tag = cpu_to_be32(n); 484 memcpy(h->dst, t->addr, sizeof h->dst); 485 memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src); 486 487 skb->dev = t->ifp->nd; 488 skb = skb_clone(skb, GFP_ATOMIC); 489 if (skb == NULL) 490 return; 491 f->sent = ktime_get(); 492 __skb_queue_head_init(&queue); 493 __skb_queue_tail(&queue, skb); 494 aoenet_xmit(&queue); 495 } 496 497 static int 498 tsince_hr(struct frame *f) 499 { 500 u64 delta = ktime_to_ns(ktime_sub(ktime_get(), f->sent)); 501 502 /* delta is normally under 4.2 seconds, avoid 64-bit division */ 503 if (likely(delta <= UINT_MAX)) 504 return (u32)delta / NSEC_PER_USEC; 505 506 /* avoid overflow after 71 minutes */ 507 if (delta > ((u64)INT_MAX * NSEC_PER_USEC)) 508 return INT_MAX; 509 510 return div_u64(delta, NSEC_PER_USEC); 511 } 512 513 static int 514 tsince(u32 tag) 515 { 516 int n; 517 518 n = jiffies & 0xffff; 519 n -= tag & 0xffff; 520 if (n < 0) 521 n += 1<<16; 522 return jiffies_to_usecs(n + 1); 523 } 524 525 static struct aoeif * 526 getif(struct aoetgt *t, struct net_device *nd) 527 { 528 struct aoeif *p, *e; 529 530 p = t->ifs; 531 e = p + NAOEIFS; 532 for (; p < e; p++) 533 if (p->nd == nd) 534 return p; 535 return NULL; 536 } 537 538 static void 539 ejectif(struct aoetgt *t, struct aoeif *ifp) 540 { 541 struct aoeif *e; 542 struct net_device *nd; 543 ulong n; 544 545 nd = ifp->nd; 546 e = t->ifs + NAOEIFS - 1; 547 n = (e - ifp) * sizeof *ifp; 548 memmove(ifp, ifp+1, n); 549 e->nd = NULL; 550 dev_put(nd); 551 } 552 553 static struct frame * 554 reassign_frame(struct frame *f) 555 { 556 struct frame *nf; 557 struct sk_buff *skb; 558 559 nf = newframe(f->t->d); 560 if (!nf) 561 return NULL; 562 if (nf->t == f->t) { 563 aoe_freetframe(nf); 564 return NULL; 565 } 566 567 skb = nf->skb; 568 nf->skb = f->skb; 569 nf->buf = f->buf; 570 nf->iter = f->iter; 571 nf->waited = 0; 572 nf->waited_total = f->waited_total; 573 nf->sent = f->sent; 574 f->skb = skb; 575 576 return nf; 577 } 578 579 static void 580 probe(struct aoetgt *t) 581 { 582 struct aoedev *d; 583 struct frame *f; 584 struct sk_buff *skb; 585 struct sk_buff_head queue; 586 size_t n, m; 587 int frag; 588 589 d = t->d; 590 f = newtframe(d, t); 591 if (!f) { 592 pr_err("%s %pm for e%ld.%d: %s\n", 593 "aoe: cannot probe remote address", 594 t->addr, 595 (long) d->aoemajor, d->aoeminor, 596 "no frame available"); 597 return; 598 } 599 f->flags |= FFL_PROBE; 600 ifrotate(t); 601 f->iter.bi_size = t->d->maxbcnt ? t->d->maxbcnt : DEFAULTBCNT; 602 ata_rw_frameinit(f); 603 skb = f->skb; 604 for (frag = 0, n = f->iter.bi_size; n > 0; ++frag, n -= m) { 605 if (n < PAGE_SIZE) 606 m = n; 607 else 608 m = PAGE_SIZE; 609 skb_fill_page_desc(skb, frag, empty_page, 0, m); 610 } 611 skb->len += f->iter.bi_size; 612 skb->data_len = f->iter.bi_size; 613 skb->truesize += f->iter.bi_size; 614 615 skb = skb_clone(f->skb, GFP_ATOMIC); 616 if (skb) { 617 f->sent = ktime_get(); 618 __skb_queue_head_init(&queue); 619 __skb_queue_tail(&queue, skb); 620 aoenet_xmit(&queue); 621 } 622 } 623 624 static long 625 rto(struct aoedev *d) 626 { 627 long t; 628 629 t = 2 * d->rttavg >> RTTSCALE; 630 t += 8 * d->rttdev >> RTTDSCALE; 631 if (t == 0) 632 t = 1; 633 634 return t; 635 } 636 637 static void 638 rexmit_deferred(struct aoedev *d) 639 { 640 struct aoetgt *t; 641 struct frame *f; 642 struct frame *nf; 643 struct list_head *pos, *nx, *head; 644 int since; 645 int untainted; 646 647 count_targets(d, &untainted); 648 649 head = &d->rexmitq; 650 list_for_each_safe(pos, nx, head) { 651 f = list_entry(pos, struct frame, head); 652 t = f->t; 653 if (t->taint) { 654 if (!(f->flags & FFL_PROBE)) { 655 nf = reassign_frame(f); 656 if (nf) { 657 if (t->nout_probes == 0 658 && untainted > 0) { 659 probe(t); 660 t->nout_probes++; 661 } 662 list_replace(&f->head, &nf->head); 663 pos = &nf->head; 664 aoe_freetframe(f); 665 f = nf; 666 t = f->t; 667 } 668 } else if (untainted < 1) { 669 /* don't probe w/o other untainted aoetgts */ 670 goto stop_probe; 671 } else if (tsince_hr(f) < t->taint * rto(d)) { 672 /* reprobe slowly when taint is high */ 673 continue; 674 } 675 } else if (f->flags & FFL_PROBE) { 676 stop_probe: /* don't probe untainted aoetgts */ 677 list_del(pos); 678 aoe_freetframe(f); 679 /* leaving d->kicked, because this is routine */ 680 f->t->d->flags |= DEVFL_KICKME; 681 continue; 682 } 683 if (t->nout >= t->maxout) 684 continue; 685 list_del(pos); 686 t->nout++; 687 if (f->flags & FFL_PROBE) 688 t->nout_probes++; 689 since = tsince_hr(f); 690 f->waited += since; 691 f->waited_total += since; 692 resend(d, f); 693 } 694 } 695 696 /* An aoetgt accumulates demerits quickly, and successful 697 * probing redeems the aoetgt slowly. 698 */ 699 static void 700 scorn(struct aoetgt *t) 701 { 702 int n; 703 704 n = t->taint++; 705 t->taint += t->taint * 2; 706 if (n > t->taint) 707 t->taint = n; 708 if (t->taint > MAX_TAINT) 709 t->taint = MAX_TAINT; 710 } 711 712 static int 713 count_targets(struct aoedev *d, int *untainted) 714 { 715 int i, good; 716 717 for (i = good = 0; i < d->ntargets && d->targets[i]; ++i) 718 if (d->targets[i]->taint == 0) 719 good++; 720 721 if (untainted) 722 *untainted = good; 723 return i; 724 } 725 726 static void 727 rexmit_timer(struct timer_list *timer) 728 { 729 struct aoedev *d; 730 struct aoetgt *t; 731 struct aoeif *ifp; 732 struct frame *f; 733 struct list_head *head, *pos, *nx; 734 LIST_HEAD(flist); 735 register long timeout; 736 ulong flags, n; 737 int i; 738 int utgts; /* number of aoetgt descriptors (not slots) */ 739 int since; 740 741 d = from_timer(d, timer, timer); 742 743 spin_lock_irqsave(&d->lock, flags); 744 745 /* timeout based on observed timings and variations */ 746 timeout = rto(d); 747 748 utgts = count_targets(d, NULL); 749 750 if (d->flags & DEVFL_TKILL) { 751 spin_unlock_irqrestore(&d->lock, flags); 752 return; 753 } 754 755 /* collect all frames to rexmit into flist */ 756 for (i = 0; i < NFACTIVE; i++) { 757 head = &d->factive[i]; 758 list_for_each_safe(pos, nx, head) { 759 f = list_entry(pos, struct frame, head); 760 if (tsince_hr(f) < timeout) 761 break; /* end of expired frames */ 762 /* move to flist for later processing */ 763 list_move_tail(pos, &flist); 764 } 765 } 766 767 /* process expired frames */ 768 while (!list_empty(&flist)) { 769 pos = flist.next; 770 f = list_entry(pos, struct frame, head); 771 since = tsince_hr(f); 772 n = f->waited_total + since; 773 n /= USEC_PER_SEC; 774 if (aoe_deadsecs 775 && n > aoe_deadsecs 776 && !(f->flags & FFL_PROBE)) { 777 /* Waited too long. Device failure. 778 * Hang all frames on first hash bucket for downdev 779 * to clean up. 780 */ 781 list_splice(&flist, &d->factive[0]); 782 aoedev_downdev(d); 783 goto out; 784 } 785 786 t = f->t; 787 n = f->waited + since; 788 n /= USEC_PER_SEC; 789 if (aoe_deadsecs && utgts > 0 790 && (n > aoe_deadsecs / utgts || n > HARD_SCORN_SECS)) 791 scorn(t); /* avoid this target */ 792 793 if (t->maxout != 1) { 794 t->ssthresh = t->maxout / 2; 795 t->maxout = 1; 796 } 797 798 if (f->flags & FFL_PROBE) { 799 t->nout_probes--; 800 } else { 801 ifp = getif(t, f->skb->dev); 802 if (ifp && ++ifp->lost > (t->nframes << 1) 803 && (ifp != t->ifs || t->ifs[1].nd)) { 804 ejectif(t, ifp); 805 ifp = NULL; 806 } 807 } 808 list_move_tail(pos, &d->rexmitq); 809 t->nout--; 810 } 811 rexmit_deferred(d); 812 813 out: 814 if ((d->flags & DEVFL_KICKME) && d->blkq) { 815 d->flags &= ~DEVFL_KICKME; 816 blk_mq_run_hw_queues(d->blkq, true); 817 } 818 819 d->timer.expires = jiffies + TIMERTICK; 820 add_timer(&d->timer); 821 822 spin_unlock_irqrestore(&d->lock, flags); 823 } 824 825 static void 826 bufinit(struct buf *buf, struct request *rq, struct bio *bio) 827 { 828 memset(buf, 0, sizeof(*buf)); 829 buf->rq = rq; 830 buf->bio = bio; 831 buf->iter = bio->bi_iter; 832 } 833 834 static struct buf * 835 nextbuf(struct aoedev *d) 836 { 837 struct request *rq; 838 struct request_queue *q; 839 struct aoe_req *req; 840 struct buf *buf; 841 struct bio *bio; 842 843 q = d->blkq; 844 if (q == NULL) 845 return NULL; /* initializing */ 846 if (d->ip.buf) 847 return d->ip.buf; 848 rq = d->ip.rq; 849 if (rq == NULL) { 850 rq = list_first_entry_or_null(&d->rq_list, struct request, 851 queuelist); 852 if (rq == NULL) 853 return NULL; 854 list_del_init(&rq->queuelist); 855 blk_mq_start_request(rq); 856 d->ip.rq = rq; 857 d->ip.nxbio = rq->bio; 858 859 req = blk_mq_rq_to_pdu(rq); 860 req->nr_bios = 0; 861 __rq_for_each_bio(bio, rq) 862 req->nr_bios++; 863 } 864 buf = mempool_alloc(d->bufpool, GFP_ATOMIC); 865 if (buf == NULL) { 866 pr_err("aoe: nextbuf: unable to mempool_alloc!\n"); 867 return NULL; 868 } 869 bio = d->ip.nxbio; 870 bufinit(buf, rq, bio); 871 bio = bio->bi_next; 872 d->ip.nxbio = bio; 873 if (bio == NULL) 874 d->ip.rq = NULL; 875 return d->ip.buf = buf; 876 } 877 878 /* enters with d->lock held */ 879 void 880 aoecmd_work(struct aoedev *d) 881 { 882 rexmit_deferred(d); 883 while (aoecmd_ata_rw(d)) 884 ; 885 } 886 887 /* this function performs work that has been deferred until sleeping is OK 888 */ 889 void 890 aoecmd_sleepwork(struct work_struct *work) 891 { 892 struct aoedev *d = container_of(work, struct aoedev, work); 893 struct block_device *bd; 894 u64 ssize; 895 896 if (d->flags & DEVFL_GDALLOC) 897 aoeblk_gdalloc(d); 898 899 if (d->flags & DEVFL_NEWSIZE) { 900 ssize = get_capacity(d->gd); 901 bd = bdget_disk(d->gd, 0); 902 if (bd) { 903 inode_lock(bd->bd_inode); 904 i_size_write(bd->bd_inode, (loff_t)ssize<<9); 905 inode_unlock(bd->bd_inode); 906 bdput(bd); 907 } 908 spin_lock_irq(&d->lock); 909 d->flags |= DEVFL_UP; 910 d->flags &= ~DEVFL_NEWSIZE; 911 spin_unlock_irq(&d->lock); 912 } 913 } 914 915 static void 916 ata_ident_fixstring(u16 *id, int ns) 917 { 918 u16 s; 919 920 while (ns-- > 0) { 921 s = *id; 922 *id++ = s >> 8 | s << 8; 923 } 924 } 925 926 static void 927 ataid_complete(struct aoedev *d, struct aoetgt *t, unsigned char *id) 928 { 929 u64 ssize; 930 u16 n; 931 932 /* word 83: command set supported */ 933 n = get_unaligned_le16(&id[83 << 1]); 934 935 /* word 86: command set/feature enabled */ 936 n |= get_unaligned_le16(&id[86 << 1]); 937 938 if (n & (1<<10)) { /* bit 10: LBA 48 */ 939 d->flags |= DEVFL_EXT; 940 941 /* word 100: number lba48 sectors */ 942 ssize = get_unaligned_le64(&id[100 << 1]); 943 944 /* set as in ide-disk.c:init_idedisk_capacity */ 945 d->geo.cylinders = ssize; 946 d->geo.cylinders /= (255 * 63); 947 d->geo.heads = 255; 948 d->geo.sectors = 63; 949 } else { 950 d->flags &= ~DEVFL_EXT; 951 952 /* number lba28 sectors */ 953 ssize = get_unaligned_le32(&id[60 << 1]); 954 955 /* NOTE: obsolete in ATA 6 */ 956 d->geo.cylinders = get_unaligned_le16(&id[54 << 1]); 957 d->geo.heads = get_unaligned_le16(&id[55 << 1]); 958 d->geo.sectors = get_unaligned_le16(&id[56 << 1]); 959 } 960 961 ata_ident_fixstring((u16 *) &id[10<<1], 10); /* serial */ 962 ata_ident_fixstring((u16 *) &id[23<<1], 4); /* firmware */ 963 ata_ident_fixstring((u16 *) &id[27<<1], 20); /* model */ 964 memcpy(d->ident, id, sizeof(d->ident)); 965 966 if (d->ssize != ssize) 967 printk(KERN_INFO 968 "aoe: %pm e%ld.%d v%04x has %llu sectors\n", 969 t->addr, 970 d->aoemajor, d->aoeminor, 971 d->fw_ver, (long long)ssize); 972 d->ssize = ssize; 973 d->geo.start = 0; 974 if (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE)) 975 return; 976 if (d->gd != NULL) { 977 set_capacity(d->gd, ssize); 978 d->flags |= DEVFL_NEWSIZE; 979 } else 980 d->flags |= DEVFL_GDALLOC; 981 schedule_work(&d->work); 982 } 983 984 static void 985 calc_rttavg(struct aoedev *d, struct aoetgt *t, int rtt) 986 { 987 register long n; 988 989 n = rtt; 990 991 /* cf. Congestion Avoidance and Control, Jacobson & Karels, 1988 */ 992 n -= d->rttavg >> RTTSCALE; 993 d->rttavg += n; 994 if (n < 0) 995 n = -n; 996 n -= d->rttdev >> RTTDSCALE; 997 d->rttdev += n; 998 999 if (!t || t->maxout >= t->nframes) 1000 return; 1001 if (t->maxout < t->ssthresh) 1002 t->maxout += 1; 1003 else if (t->nout == t->maxout && t->next_cwnd-- == 0) { 1004 t->maxout += 1; 1005 t->next_cwnd = t->maxout; 1006 } 1007 } 1008 1009 static struct aoetgt * 1010 gettgt(struct aoedev *d, char *addr) 1011 { 1012 struct aoetgt **t, **e; 1013 1014 t = d->targets; 1015 e = t + d->ntargets; 1016 for (; t < e && *t; t++) 1017 if (memcmp((*t)->addr, addr, sizeof((*t)->addr)) == 0) 1018 return *t; 1019 return NULL; 1020 } 1021 1022 static void 1023 bvcpy(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter, long cnt) 1024 { 1025 int soff = 0; 1026 struct bio_vec bv; 1027 1028 iter.bi_size = cnt; 1029 1030 __bio_for_each_segment(bv, bio, iter, iter) { 1031 char *p = kmap_atomic(bv.bv_page) + bv.bv_offset; 1032 skb_copy_bits(skb, soff, p, bv.bv_len); 1033 kunmap_atomic(p); 1034 soff += bv.bv_len; 1035 } 1036 } 1037 1038 void 1039 aoe_end_request(struct aoedev *d, struct request *rq, int fastfail) 1040 { 1041 struct bio *bio; 1042 int bok; 1043 struct request_queue *q; 1044 blk_status_t err = BLK_STS_OK; 1045 1046 q = d->blkq; 1047 if (rq == d->ip.rq) 1048 d->ip.rq = NULL; 1049 do { 1050 bio = rq->bio; 1051 bok = !fastfail && !bio->bi_status; 1052 if (!bok) 1053 err = BLK_STS_IOERR; 1054 } while (blk_update_request(rq, bok ? BLK_STS_OK : BLK_STS_IOERR, bio->bi_iter.bi_size)); 1055 1056 __blk_mq_end_request(rq, err); 1057 1058 /* cf. http://lkml.org/lkml/2006/10/31/28 */ 1059 if (!fastfail) 1060 blk_mq_run_hw_queues(q, true); 1061 } 1062 1063 static void 1064 aoe_end_buf(struct aoedev *d, struct buf *buf) 1065 { 1066 struct request *rq = buf->rq; 1067 struct aoe_req *req = blk_mq_rq_to_pdu(rq); 1068 1069 if (buf == d->ip.buf) 1070 d->ip.buf = NULL; 1071 mempool_free(buf, d->bufpool); 1072 if (--req->nr_bios == 0) 1073 aoe_end_request(d, rq, 0); 1074 } 1075 1076 static void 1077 ktiocomplete(struct frame *f) 1078 { 1079 struct aoe_hdr *hin, *hout; 1080 struct aoe_atahdr *ahin, *ahout; 1081 struct buf *buf; 1082 struct sk_buff *skb; 1083 struct aoetgt *t; 1084 struct aoeif *ifp; 1085 struct aoedev *d; 1086 long n; 1087 int untainted; 1088 1089 if (f == NULL) 1090 return; 1091 1092 t = f->t; 1093 d = t->d; 1094 skb = f->r_skb; 1095 buf = f->buf; 1096 if (f->flags & FFL_PROBE) 1097 goto out; 1098 if (!skb) /* just fail the buf. */ 1099 goto noskb; 1100 1101 hout = (struct aoe_hdr *) skb_mac_header(f->skb); 1102 ahout = (struct aoe_atahdr *) (hout+1); 1103 1104 hin = (struct aoe_hdr *) skb->data; 1105 skb_pull(skb, sizeof(*hin)); 1106 ahin = (struct aoe_atahdr *) skb->data; 1107 skb_pull(skb, sizeof(*ahin)); 1108 if (ahin->cmdstat & 0xa9) { /* these bits cleared on success */ 1109 pr_err("aoe: ata error cmd=%2.2Xh stat=%2.2Xh from e%ld.%d\n", 1110 ahout->cmdstat, ahin->cmdstat, 1111 d->aoemajor, d->aoeminor); 1112 noskb: if (buf) 1113 buf->bio->bi_status = BLK_STS_IOERR; 1114 goto out; 1115 } 1116 1117 n = ahout->scnt << 9; 1118 switch (ahout->cmdstat) { 1119 case ATA_CMD_PIO_READ: 1120 case ATA_CMD_PIO_READ_EXT: 1121 if (skb->len < n) { 1122 pr_err("%s e%ld.%d. skb->len=%d need=%ld\n", 1123 "aoe: runt data size in read from", 1124 (long) d->aoemajor, d->aoeminor, 1125 skb->len, n); 1126 buf->bio->bi_status = BLK_STS_IOERR; 1127 break; 1128 } 1129 if (n > f->iter.bi_size) { 1130 pr_err_ratelimited("%s e%ld.%d. bytes=%ld need=%u\n", 1131 "aoe: too-large data size in read from", 1132 (long) d->aoemajor, d->aoeminor, 1133 n, f->iter.bi_size); 1134 buf->bio->bi_status = BLK_STS_IOERR; 1135 break; 1136 } 1137 bvcpy(skb, f->buf->bio, f->iter, n); 1138 fallthrough; 1139 case ATA_CMD_PIO_WRITE: 1140 case ATA_CMD_PIO_WRITE_EXT: 1141 spin_lock_irq(&d->lock); 1142 ifp = getif(t, skb->dev); 1143 if (ifp) 1144 ifp->lost = 0; 1145 spin_unlock_irq(&d->lock); 1146 break; 1147 case ATA_CMD_ID_ATA: 1148 if (skb->len < 512) { 1149 pr_info("%s e%ld.%d. skb->len=%d need=512\n", 1150 "aoe: runt data size in ataid from", 1151 (long) d->aoemajor, d->aoeminor, 1152 skb->len); 1153 break; 1154 } 1155 if (skb_linearize(skb)) 1156 break; 1157 spin_lock_irq(&d->lock); 1158 ataid_complete(d, t, skb->data); 1159 spin_unlock_irq(&d->lock); 1160 break; 1161 default: 1162 pr_info("aoe: unrecognized ata command %2.2Xh for %d.%d\n", 1163 ahout->cmdstat, 1164 be16_to_cpu(get_unaligned(&hin->major)), 1165 hin->minor); 1166 } 1167 out: 1168 spin_lock_irq(&d->lock); 1169 if (t->taint > 0 1170 && --t->taint > 0 1171 && t->nout_probes == 0) { 1172 count_targets(d, &untainted); 1173 if (untainted > 0) { 1174 probe(t); 1175 t->nout_probes++; 1176 } 1177 } 1178 1179 aoe_freetframe(f); 1180 1181 if (buf && --buf->nframesout == 0 && buf->iter.bi_size == 0) 1182 aoe_end_buf(d, buf); 1183 1184 spin_unlock_irq(&d->lock); 1185 aoedev_put(d); 1186 dev_kfree_skb(skb); 1187 } 1188 1189 /* Enters with iocq.lock held. 1190 * Returns true iff responses needing processing remain. 1191 */ 1192 static int 1193 ktio(int id) 1194 { 1195 struct frame *f; 1196 struct list_head *pos; 1197 int i; 1198 int actual_id; 1199 1200 for (i = 0; ; ++i) { 1201 if (i == MAXIOC) 1202 return 1; 1203 if (list_empty(&iocq[id].head)) 1204 return 0; 1205 pos = iocq[id].head.next; 1206 list_del(pos); 1207 f = list_entry(pos, struct frame, head); 1208 spin_unlock_irq(&iocq[id].lock); 1209 ktiocomplete(f); 1210 1211 /* Figure out if extra threads are required. */ 1212 actual_id = f->t->d->aoeminor % ncpus; 1213 1214 if (!kts[actual_id].active) { 1215 BUG_ON(id != 0); 1216 mutex_lock(&ktio_spawn_lock); 1217 if (!kts[actual_id].active 1218 && aoe_ktstart(&kts[actual_id]) == 0) 1219 kts[actual_id].active = 1; 1220 mutex_unlock(&ktio_spawn_lock); 1221 } 1222 spin_lock_irq(&iocq[id].lock); 1223 } 1224 } 1225 1226 static int 1227 kthread(void *vp) 1228 { 1229 struct ktstate *k; 1230 DECLARE_WAITQUEUE(wait, current); 1231 int more; 1232 1233 k = vp; 1234 current->flags |= PF_NOFREEZE; 1235 set_user_nice(current, -10); 1236 complete(&k->rendez); /* tell spawner we're running */ 1237 do { 1238 spin_lock_irq(k->lock); 1239 more = k->fn(k->id); 1240 if (!more) { 1241 add_wait_queue(k->waitq, &wait); 1242 __set_current_state(TASK_INTERRUPTIBLE); 1243 } 1244 spin_unlock_irq(k->lock); 1245 if (!more) { 1246 schedule(); 1247 remove_wait_queue(k->waitq, &wait); 1248 } else 1249 cond_resched(); 1250 } while (!kthread_should_stop()); 1251 complete(&k->rendez); /* tell spawner we're stopping */ 1252 return 0; 1253 } 1254 1255 void 1256 aoe_ktstop(struct ktstate *k) 1257 { 1258 kthread_stop(k->task); 1259 wait_for_completion(&k->rendez); 1260 } 1261 1262 int 1263 aoe_ktstart(struct ktstate *k) 1264 { 1265 struct task_struct *task; 1266 1267 init_completion(&k->rendez); 1268 task = kthread_run(kthread, k, "%s", k->name); 1269 if (task == NULL || IS_ERR(task)) 1270 return -ENOMEM; 1271 k->task = task; 1272 wait_for_completion(&k->rendez); /* allow kthread to start */ 1273 init_completion(&k->rendez); /* for waiting for exit later */ 1274 return 0; 1275 } 1276 1277 /* pass it off to kthreads for processing */ 1278 static void 1279 ktcomplete(struct frame *f, struct sk_buff *skb) 1280 { 1281 int id; 1282 ulong flags; 1283 1284 f->r_skb = skb; 1285 id = f->t->d->aoeminor % ncpus; 1286 spin_lock_irqsave(&iocq[id].lock, flags); 1287 if (!kts[id].active) { 1288 spin_unlock_irqrestore(&iocq[id].lock, flags); 1289 /* The thread with id has not been spawned yet, 1290 * so delegate the work to the main thread and 1291 * try spawning a new thread. 1292 */ 1293 id = 0; 1294 spin_lock_irqsave(&iocq[id].lock, flags); 1295 } 1296 list_add_tail(&f->head, &iocq[id].head); 1297 spin_unlock_irqrestore(&iocq[id].lock, flags); 1298 wake_up(&ktiowq[id]); 1299 } 1300 1301 struct sk_buff * 1302 aoecmd_ata_rsp(struct sk_buff *skb) 1303 { 1304 struct aoedev *d; 1305 struct aoe_hdr *h; 1306 struct frame *f; 1307 u32 n; 1308 ulong flags; 1309 char ebuf[128]; 1310 u16 aoemajor; 1311 1312 h = (struct aoe_hdr *) skb->data; 1313 aoemajor = be16_to_cpu(get_unaligned(&h->major)); 1314 d = aoedev_by_aoeaddr(aoemajor, h->minor, 0); 1315 if (d == NULL) { 1316 snprintf(ebuf, sizeof ebuf, "aoecmd_ata_rsp: ata response " 1317 "for unknown device %d.%d\n", 1318 aoemajor, h->minor); 1319 aoechr_error(ebuf); 1320 return skb; 1321 } 1322 1323 spin_lock_irqsave(&d->lock, flags); 1324 1325 n = be32_to_cpu(get_unaligned(&h->tag)); 1326 f = getframe(d, n); 1327 if (f) { 1328 calc_rttavg(d, f->t, tsince_hr(f)); 1329 f->t->nout--; 1330 if (f->flags & FFL_PROBE) 1331 f->t->nout_probes--; 1332 } else { 1333 f = getframe_deferred(d, n); 1334 if (f) { 1335 calc_rttavg(d, NULL, tsince_hr(f)); 1336 } else { 1337 calc_rttavg(d, NULL, tsince(n)); 1338 spin_unlock_irqrestore(&d->lock, flags); 1339 aoedev_put(d); 1340 snprintf(ebuf, sizeof(ebuf), 1341 "%15s e%d.%d tag=%08x@%08lx s=%pm d=%pm\n", 1342 "unexpected rsp", 1343 get_unaligned_be16(&h->major), 1344 h->minor, 1345 get_unaligned_be32(&h->tag), 1346 jiffies, 1347 h->src, 1348 h->dst); 1349 aoechr_error(ebuf); 1350 return skb; 1351 } 1352 } 1353 aoecmd_work(d); 1354 1355 spin_unlock_irqrestore(&d->lock, flags); 1356 1357 ktcomplete(f, skb); 1358 1359 /* 1360 * Note here that we do not perform an aoedev_put, as we are 1361 * leaving this reference for the ktio to release. 1362 */ 1363 return NULL; 1364 } 1365 1366 void 1367 aoecmd_cfg(ushort aoemajor, unsigned char aoeminor) 1368 { 1369 struct sk_buff_head queue; 1370 1371 __skb_queue_head_init(&queue); 1372 aoecmd_cfg_pkts(aoemajor, aoeminor, &queue); 1373 aoenet_xmit(&queue); 1374 } 1375 1376 struct sk_buff * 1377 aoecmd_ata_id(struct aoedev *d) 1378 { 1379 struct aoe_hdr *h; 1380 struct aoe_atahdr *ah; 1381 struct frame *f; 1382 struct sk_buff *skb; 1383 struct aoetgt *t; 1384 1385 f = newframe(d); 1386 if (f == NULL) 1387 return NULL; 1388 1389 t = *d->tgt; 1390 1391 /* initialize the headers & frame */ 1392 skb = f->skb; 1393 h = (struct aoe_hdr *) skb_mac_header(skb); 1394 ah = (struct aoe_atahdr *) (h+1); 1395 skb_put(skb, sizeof *h + sizeof *ah); 1396 memset(h, 0, skb->len); 1397 f->tag = aoehdr_atainit(d, t, h); 1398 fhash(f); 1399 t->nout++; 1400 f->waited = 0; 1401 f->waited_total = 0; 1402 1403 /* set up ata header */ 1404 ah->scnt = 1; 1405 ah->cmdstat = ATA_CMD_ID_ATA; 1406 ah->lba3 = 0xa0; 1407 1408 skb->dev = t->ifp->nd; 1409 1410 d->rttavg = RTTAVG_INIT; 1411 d->rttdev = RTTDEV_INIT; 1412 d->timer.function = rexmit_timer; 1413 1414 skb = skb_clone(skb, GFP_ATOMIC); 1415 if (skb) 1416 f->sent = ktime_get(); 1417 1418 return skb; 1419 } 1420 1421 static struct aoetgt ** 1422 grow_targets(struct aoedev *d) 1423 { 1424 ulong oldn, newn; 1425 struct aoetgt **tt; 1426 1427 oldn = d->ntargets; 1428 newn = oldn * 2; 1429 tt = kcalloc(newn, sizeof(*d->targets), GFP_ATOMIC); 1430 if (!tt) 1431 return NULL; 1432 memmove(tt, d->targets, sizeof(*d->targets) * oldn); 1433 d->tgt = tt + (d->tgt - d->targets); 1434 kfree(d->targets); 1435 d->targets = tt; 1436 d->ntargets = newn; 1437 1438 return &d->targets[oldn]; 1439 } 1440 1441 static struct aoetgt * 1442 addtgt(struct aoedev *d, char *addr, ulong nframes) 1443 { 1444 struct aoetgt *t, **tt, **te; 1445 1446 tt = d->targets; 1447 te = tt + d->ntargets; 1448 for (; tt < te && *tt; tt++) 1449 ; 1450 1451 if (tt == te) { 1452 tt = grow_targets(d); 1453 if (!tt) 1454 goto nomem; 1455 } 1456 t = kzalloc(sizeof(*t), GFP_ATOMIC); 1457 if (!t) 1458 goto nomem; 1459 t->nframes = nframes; 1460 t->d = d; 1461 memcpy(t->addr, addr, sizeof t->addr); 1462 t->ifp = t->ifs; 1463 aoecmd_wreset(t); 1464 t->maxout = t->nframes / 2; 1465 INIT_LIST_HEAD(&t->ffree); 1466 return *tt = t; 1467 1468 nomem: 1469 pr_info("aoe: cannot allocate memory to add target\n"); 1470 return NULL; 1471 } 1472 1473 static void 1474 setdbcnt(struct aoedev *d) 1475 { 1476 struct aoetgt **t, **e; 1477 int bcnt = 0; 1478 1479 t = d->targets; 1480 e = t + d->ntargets; 1481 for (; t < e && *t; t++) 1482 if (bcnt == 0 || bcnt > (*t)->minbcnt) 1483 bcnt = (*t)->minbcnt; 1484 if (bcnt != d->maxbcnt) { 1485 d->maxbcnt = bcnt; 1486 pr_info("aoe: e%ld.%d: setting %d byte data frames\n", 1487 d->aoemajor, d->aoeminor, bcnt); 1488 } 1489 } 1490 1491 static void 1492 setifbcnt(struct aoetgt *t, struct net_device *nd, int bcnt) 1493 { 1494 struct aoedev *d; 1495 struct aoeif *p, *e; 1496 int minbcnt; 1497 1498 d = t->d; 1499 minbcnt = bcnt; 1500 p = t->ifs; 1501 e = p + NAOEIFS; 1502 for (; p < e; p++) { 1503 if (p->nd == NULL) 1504 break; /* end of the valid interfaces */ 1505 if (p->nd == nd) { 1506 p->bcnt = bcnt; /* we're updating */ 1507 nd = NULL; 1508 } else if (minbcnt > p->bcnt) 1509 minbcnt = p->bcnt; /* find the min interface */ 1510 } 1511 if (nd) { 1512 if (p == e) { 1513 pr_err("aoe: device setifbcnt failure; too many interfaces.\n"); 1514 return; 1515 } 1516 dev_hold(nd); 1517 p->nd = nd; 1518 p->bcnt = bcnt; 1519 } 1520 t->minbcnt = minbcnt; 1521 setdbcnt(d); 1522 } 1523 1524 void 1525 aoecmd_cfg_rsp(struct sk_buff *skb) 1526 { 1527 struct aoedev *d; 1528 struct aoe_hdr *h; 1529 struct aoe_cfghdr *ch; 1530 struct aoetgt *t; 1531 ulong flags, aoemajor; 1532 struct sk_buff *sl; 1533 struct sk_buff_head queue; 1534 u16 n; 1535 1536 sl = NULL; 1537 h = (struct aoe_hdr *) skb_mac_header(skb); 1538 ch = (struct aoe_cfghdr *) (h+1); 1539 1540 /* 1541 * Enough people have their dip switches set backwards to 1542 * warrant a loud message for this special case. 1543 */ 1544 aoemajor = get_unaligned_be16(&h->major); 1545 if (aoemajor == 0xfff) { 1546 printk(KERN_ERR "aoe: Warning: shelf address is all ones. " 1547 "Check shelf dip switches.\n"); 1548 return; 1549 } 1550 if (aoemajor == 0xffff) { 1551 pr_info("aoe: e%ld.%d: broadcast shelf number invalid\n", 1552 aoemajor, (int) h->minor); 1553 return; 1554 } 1555 if (h->minor == 0xff) { 1556 pr_info("aoe: e%ld.%d: broadcast slot number invalid\n", 1557 aoemajor, (int) h->minor); 1558 return; 1559 } 1560 1561 n = be16_to_cpu(ch->bufcnt); 1562 if (n > aoe_maxout) /* keep it reasonable */ 1563 n = aoe_maxout; 1564 1565 d = aoedev_by_aoeaddr(aoemajor, h->minor, 1); 1566 if (d == NULL) { 1567 pr_info("aoe: device allocation failure\n"); 1568 return; 1569 } 1570 1571 spin_lock_irqsave(&d->lock, flags); 1572 1573 t = gettgt(d, h->src); 1574 if (t) { 1575 t->nframes = n; 1576 if (n < t->maxout) 1577 aoecmd_wreset(t); 1578 } else { 1579 t = addtgt(d, h->src, n); 1580 if (!t) 1581 goto bail; 1582 } 1583 n = skb->dev->mtu; 1584 n -= sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr); 1585 n /= 512; 1586 if (n > ch->scnt) 1587 n = ch->scnt; 1588 n = n ? n * 512 : DEFAULTBCNT; 1589 setifbcnt(t, skb->dev, n); 1590 1591 /* don't change users' perspective */ 1592 if (d->nopen == 0) { 1593 d->fw_ver = be16_to_cpu(ch->fwver); 1594 sl = aoecmd_ata_id(d); 1595 } 1596 bail: 1597 spin_unlock_irqrestore(&d->lock, flags); 1598 aoedev_put(d); 1599 if (sl) { 1600 __skb_queue_head_init(&queue); 1601 __skb_queue_tail(&queue, sl); 1602 aoenet_xmit(&queue); 1603 } 1604 } 1605 1606 void 1607 aoecmd_wreset(struct aoetgt *t) 1608 { 1609 t->maxout = 1; 1610 t->ssthresh = t->nframes / 2; 1611 t->next_cwnd = t->nframes; 1612 } 1613 1614 void 1615 aoecmd_cleanslate(struct aoedev *d) 1616 { 1617 struct aoetgt **t, **te; 1618 1619 d->rttavg = RTTAVG_INIT; 1620 d->rttdev = RTTDEV_INIT; 1621 d->maxbcnt = 0; 1622 1623 t = d->targets; 1624 te = t + d->ntargets; 1625 for (; t < te && *t; t++) 1626 aoecmd_wreset(*t); 1627 } 1628 1629 void 1630 aoe_failbuf(struct aoedev *d, struct buf *buf) 1631 { 1632 if (buf == NULL) 1633 return; 1634 buf->iter.bi_size = 0; 1635 buf->bio->bi_status = BLK_STS_IOERR; 1636 if (buf->nframesout == 0) 1637 aoe_end_buf(d, buf); 1638 } 1639 1640 void 1641 aoe_flush_iocq(void) 1642 { 1643 int i; 1644 1645 for (i = 0; i < ncpus; i++) { 1646 if (kts[i].active) 1647 aoe_flush_iocq_by_index(i); 1648 } 1649 } 1650 1651 void 1652 aoe_flush_iocq_by_index(int id) 1653 { 1654 struct frame *f; 1655 struct aoedev *d; 1656 LIST_HEAD(flist); 1657 struct list_head *pos; 1658 struct sk_buff *skb; 1659 ulong flags; 1660 1661 spin_lock_irqsave(&iocq[id].lock, flags); 1662 list_splice_init(&iocq[id].head, &flist); 1663 spin_unlock_irqrestore(&iocq[id].lock, flags); 1664 while (!list_empty(&flist)) { 1665 pos = flist.next; 1666 list_del(pos); 1667 f = list_entry(pos, struct frame, head); 1668 d = f->t->d; 1669 skb = f->r_skb; 1670 spin_lock_irqsave(&d->lock, flags); 1671 if (f->buf) { 1672 f->buf->nframesout--; 1673 aoe_failbuf(d, f->buf); 1674 } 1675 aoe_freetframe(f); 1676 spin_unlock_irqrestore(&d->lock, flags); 1677 dev_kfree_skb(skb); 1678 aoedev_put(d); 1679 } 1680 } 1681 1682 int __init 1683 aoecmd_init(void) 1684 { 1685 void *p; 1686 int i; 1687 int ret; 1688 1689 /* get_zeroed_page returns page with ref count 1 */ 1690 p = (void *) get_zeroed_page(GFP_KERNEL); 1691 if (!p) 1692 return -ENOMEM; 1693 empty_page = virt_to_page(p); 1694 1695 ncpus = num_online_cpus(); 1696 1697 iocq = kcalloc(ncpus, sizeof(struct iocq_ktio), GFP_KERNEL); 1698 if (!iocq) 1699 return -ENOMEM; 1700 1701 kts = kcalloc(ncpus, sizeof(struct ktstate), GFP_KERNEL); 1702 if (!kts) { 1703 ret = -ENOMEM; 1704 goto kts_fail; 1705 } 1706 1707 ktiowq = kcalloc(ncpus, sizeof(wait_queue_head_t), GFP_KERNEL); 1708 if (!ktiowq) { 1709 ret = -ENOMEM; 1710 goto ktiowq_fail; 1711 } 1712 1713 mutex_init(&ktio_spawn_lock); 1714 1715 for (i = 0; i < ncpus; i++) { 1716 INIT_LIST_HEAD(&iocq[i].head); 1717 spin_lock_init(&iocq[i].lock); 1718 init_waitqueue_head(&ktiowq[i]); 1719 snprintf(kts[i].name, sizeof(kts[i].name), "aoe_ktio%d", i); 1720 kts[i].fn = ktio; 1721 kts[i].waitq = &ktiowq[i]; 1722 kts[i].lock = &iocq[i].lock; 1723 kts[i].id = i; 1724 kts[i].active = 0; 1725 } 1726 kts[0].active = 1; 1727 if (aoe_ktstart(&kts[0])) { 1728 ret = -ENOMEM; 1729 goto ktstart_fail; 1730 } 1731 return 0; 1732 1733 ktstart_fail: 1734 kfree(ktiowq); 1735 ktiowq_fail: 1736 kfree(kts); 1737 kts_fail: 1738 kfree(iocq); 1739 1740 return ret; 1741 } 1742 1743 void 1744 aoecmd_exit(void) 1745 { 1746 int i; 1747 1748 for (i = 0; i < ncpus; i++) 1749 if (kts[i].active) 1750 aoe_ktstop(&kts[i]); 1751 1752 aoe_flush_iocq(); 1753 1754 /* Free up the iocq and thread speicific configuration 1755 * allocated during startup. 1756 */ 1757 kfree(iocq); 1758 kfree(kts); 1759 kfree(ktiowq); 1760 1761 free_page((unsigned long) page_address(empty_page)); 1762 empty_page = NULL; 1763 } 1764