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 = timer_container_of(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 | DEVFL_DEAD)) { 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 d->flags |= DEVFL_DEAD; 790 queue_work(aoe_wq, &d->work); 791 goto out; 792 } 793 794 t = f->t; 795 n = f->waited + since; 796 n /= USEC_PER_SEC; 797 if (aoe_deadsecs && utgts > 0 798 && (n > aoe_deadsecs / utgts || n > HARD_SCORN_SECS)) 799 scorn(t); /* avoid this target */ 800 801 if (t->maxout != 1) { 802 t->ssthresh = t->maxout / 2; 803 t->maxout = 1; 804 } 805 806 if (f->flags & FFL_PROBE) { 807 t->nout_probes--; 808 } else { 809 ifp = getif(t, f->skb->dev); 810 if (ifp && ++ifp->lost > (t->nframes << 1) 811 && (ifp != t->ifs || t->ifs[1].nd)) { 812 ejectif(t, ifp); 813 ifp = NULL; 814 } 815 } 816 list_move_tail(pos, &d->rexmitq); 817 t->nout--; 818 } 819 rexmit_deferred(d); 820 821 out: 822 if ((d->flags & DEVFL_KICKME) && d->blkq) { 823 d->flags &= ~DEVFL_KICKME; 824 blk_mq_run_hw_queues(d->blkq, true); 825 } 826 827 d->timer.expires = jiffies + TIMERTICK; 828 add_timer(&d->timer); 829 830 spin_unlock_irqrestore(&d->lock, flags); 831 } 832 833 static void 834 bufinit(struct buf *buf, struct request *rq, struct bio *bio) 835 { 836 memset(buf, 0, sizeof(*buf)); 837 buf->rq = rq; 838 buf->bio = bio; 839 buf->iter = bio->bi_iter; 840 } 841 842 static struct buf * 843 nextbuf(struct aoedev *d) 844 { 845 struct request *rq; 846 struct request_queue *q; 847 struct aoe_req *req; 848 struct buf *buf; 849 struct bio *bio; 850 851 q = d->blkq; 852 if (q == NULL) 853 return NULL; /* initializing */ 854 if (d->ip.buf) 855 return d->ip.buf; 856 rq = d->ip.rq; 857 if (rq == NULL) { 858 rq = list_first_entry_or_null(&d->rq_list, struct request, 859 queuelist); 860 if (rq == NULL) 861 return NULL; 862 list_del_init(&rq->queuelist); 863 blk_mq_start_request(rq); 864 d->ip.rq = rq; 865 d->ip.nxbio = rq->bio; 866 867 req = blk_mq_rq_to_pdu(rq); 868 req->nr_bios = 0; 869 __rq_for_each_bio(bio, rq) 870 req->nr_bios++; 871 } 872 buf = mempool_alloc(d->bufpool, GFP_ATOMIC); 873 if (buf == NULL) { 874 pr_err("aoe: nextbuf: unable to mempool_alloc!\n"); 875 return NULL; 876 } 877 bio = d->ip.nxbio; 878 bufinit(buf, rq, bio); 879 bio = bio->bi_next; 880 d->ip.nxbio = bio; 881 if (bio == NULL) 882 d->ip.rq = NULL; 883 return d->ip.buf = buf; 884 } 885 886 /* enters with d->lock held */ 887 void 888 aoecmd_work(struct aoedev *d) 889 { 890 rexmit_deferred(d); 891 while (aoecmd_ata_rw(d)) 892 ; 893 } 894 895 /* this function performs work that has been deferred until sleeping is OK 896 */ 897 void 898 aoecmd_sleepwork(struct work_struct *work) 899 { 900 struct aoedev *d = container_of(work, struct aoedev, work); 901 902 if (d->flags & DEVFL_DEAD) 903 aoedev_downdev(d); 904 905 if (d->flags & DEVFL_GDALLOC) 906 aoeblk_gdalloc(d); 907 908 if (d->flags & DEVFL_NEWSIZE) { 909 set_capacity_and_notify(d->gd, d->ssize); 910 911 spin_lock_irq(&d->lock); 912 d->flags |= DEVFL_UP; 913 d->flags &= ~DEVFL_NEWSIZE; 914 spin_unlock_irq(&d->lock); 915 } 916 } 917 918 static void 919 ata_ident_fixstring(u16 *id, int ns) 920 { 921 u16 s; 922 923 while (ns-- > 0) { 924 s = *id; 925 *id++ = s >> 8 | s << 8; 926 } 927 } 928 929 static void 930 ataid_complete(struct aoedev *d, struct aoetgt *t, unsigned char *id) 931 { 932 u64 ssize; 933 u16 n; 934 935 /* word 83: command set supported */ 936 n = get_unaligned_le16(&id[83 << 1]); 937 938 /* word 86: command set/feature enabled */ 939 n |= get_unaligned_le16(&id[86 << 1]); 940 941 if (n & (1<<10)) { /* bit 10: LBA 48 */ 942 d->flags |= DEVFL_EXT; 943 944 /* word 100: number lba48 sectors */ 945 ssize = get_unaligned_le64(&id[100 << 1]); 946 947 /* set as in ide-disk.c:init_idedisk_capacity */ 948 d->geo.cylinders = ssize; 949 d->geo.cylinders /= (255 * 63); 950 d->geo.heads = 255; 951 d->geo.sectors = 63; 952 } else { 953 d->flags &= ~DEVFL_EXT; 954 955 /* number lba28 sectors */ 956 ssize = get_unaligned_le32(&id[60 << 1]); 957 958 /* NOTE: obsolete in ATA 6 */ 959 d->geo.cylinders = get_unaligned_le16(&id[54 << 1]); 960 d->geo.heads = get_unaligned_le16(&id[55 << 1]); 961 d->geo.sectors = get_unaligned_le16(&id[56 << 1]); 962 } 963 964 ata_ident_fixstring((u16 *) &id[10<<1], 10); /* serial */ 965 ata_ident_fixstring((u16 *) &id[23<<1], 4); /* firmware */ 966 ata_ident_fixstring((u16 *) &id[27<<1], 20); /* model */ 967 memcpy(d->ident, id, sizeof(d->ident)); 968 969 if (d->ssize != ssize) 970 printk(KERN_INFO 971 "aoe: %pm e%ld.%d v%04x has %llu sectors\n", 972 t->addr, 973 d->aoemajor, d->aoeminor, 974 d->fw_ver, (long long)ssize); 975 d->ssize = ssize; 976 d->geo.start = 0; 977 if (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE)) 978 return; 979 if (d->gd != NULL) 980 d->flags |= DEVFL_NEWSIZE; 981 else 982 d->flags |= DEVFL_GDALLOC; 983 queue_work(aoe_wq, &d->work); 984 } 985 986 static void 987 calc_rttavg(struct aoedev *d, struct aoetgt *t, int rtt) 988 { 989 register long n; 990 991 n = rtt; 992 993 /* cf. Congestion Avoidance and Control, Jacobson & Karels, 1988 */ 994 n -= d->rttavg >> RTTSCALE; 995 d->rttavg += n; 996 if (n < 0) 997 n = -n; 998 n -= d->rttdev >> RTTDSCALE; 999 d->rttdev += n; 1000 1001 if (!t || t->maxout >= t->nframes) 1002 return; 1003 if (t->maxout < t->ssthresh) 1004 t->maxout += 1; 1005 else if (t->nout == t->maxout && t->next_cwnd-- == 0) { 1006 t->maxout += 1; 1007 t->next_cwnd = t->maxout; 1008 } 1009 } 1010 1011 static struct aoetgt * 1012 gettgt(struct aoedev *d, char *addr) 1013 { 1014 struct aoetgt **t, **e; 1015 1016 t = d->targets; 1017 e = t + d->ntargets; 1018 for (; t < e && *t; t++) 1019 if (memcmp((*t)->addr, addr, sizeof((*t)->addr)) == 0) 1020 return *t; 1021 return NULL; 1022 } 1023 1024 static void 1025 bvcpy(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter, long cnt) 1026 { 1027 int soff = 0; 1028 struct bio_vec bv; 1029 1030 iter.bi_size = cnt; 1031 1032 __bio_for_each_segment(bv, bio, iter, iter) { 1033 char *p = bvec_kmap_local(&bv); 1034 skb_copy_bits(skb, soff, p, bv.bv_len); 1035 kunmap_local(p); 1036 soff += bv.bv_len; 1037 } 1038 } 1039 1040 void 1041 aoe_end_request(struct aoedev *d, struct request *rq, int fastfail) 1042 { 1043 struct bio *bio; 1044 int bok; 1045 struct request_queue *q; 1046 blk_status_t err = BLK_STS_OK; 1047 1048 q = d->blkq; 1049 if (rq == d->ip.rq) 1050 d->ip.rq = NULL; 1051 do { 1052 bio = rq->bio; 1053 bok = !fastfail && !bio->bi_status; 1054 if (!bok) 1055 err = BLK_STS_IOERR; 1056 } while (blk_update_request(rq, bok ? BLK_STS_OK : BLK_STS_IOERR, bio->bi_iter.bi_size)); 1057 1058 __blk_mq_end_request(rq, err); 1059 1060 /* cf. https://lore.kernel.org/lkml/20061031071040.GS14055@kernel.dk/ */ 1061 if (!fastfail) 1062 blk_mq_run_hw_queues(q, true); 1063 } 1064 1065 static void 1066 aoe_end_buf(struct aoedev *d, struct buf *buf) 1067 { 1068 struct request *rq = buf->rq; 1069 struct aoe_req *req = blk_mq_rq_to_pdu(rq); 1070 1071 if (buf == d->ip.buf) 1072 d->ip.buf = NULL; 1073 mempool_free(buf, d->bufpool); 1074 if (--req->nr_bios == 0) 1075 aoe_end_request(d, rq, 0); 1076 } 1077 1078 static void 1079 ktiocomplete(struct frame *f) 1080 { 1081 struct aoe_hdr *hin, *hout; 1082 struct aoe_atahdr *ahin, *ahout; 1083 struct buf *buf; 1084 struct sk_buff *skb; 1085 struct aoetgt *t; 1086 struct aoeif *ifp; 1087 struct aoedev *d; 1088 long n; 1089 int untainted; 1090 1091 if (f == NULL) 1092 return; 1093 1094 t = f->t; 1095 d = t->d; 1096 skb = f->r_skb; 1097 buf = f->buf; 1098 if (f->flags & FFL_PROBE) 1099 goto out; 1100 if (!skb) /* just fail the buf. */ 1101 goto noskb; 1102 1103 hout = (struct aoe_hdr *) skb_mac_header(f->skb); 1104 ahout = (struct aoe_atahdr *) (hout+1); 1105 1106 hin = (struct aoe_hdr *) skb->data; 1107 skb_pull(skb, sizeof(*hin)); 1108 ahin = (struct aoe_atahdr *) skb->data; 1109 skb_pull(skb, sizeof(*ahin)); 1110 if (ahin->cmdstat & 0xa9) { /* these bits cleared on success */ 1111 pr_err("aoe: ata error cmd=%2.2Xh stat=%2.2Xh from e%ld.%d\n", 1112 ahout->cmdstat, ahin->cmdstat, 1113 d->aoemajor, d->aoeminor); 1114 noskb: if (buf) 1115 buf->bio->bi_status = BLK_STS_IOERR; 1116 goto out; 1117 } 1118 1119 n = ahout->scnt << 9; 1120 switch (ahout->cmdstat) { 1121 case ATA_CMD_PIO_READ: 1122 case ATA_CMD_PIO_READ_EXT: 1123 if (skb->len < n) { 1124 pr_err("%s e%ld.%d. skb->len=%d need=%ld\n", 1125 "aoe: runt data size in read from", 1126 (long) d->aoemajor, d->aoeminor, 1127 skb->len, n); 1128 buf->bio->bi_status = BLK_STS_IOERR; 1129 break; 1130 } 1131 if (n > f->iter.bi_size) { 1132 pr_err_ratelimited("%s e%ld.%d. bytes=%ld need=%u\n", 1133 "aoe: too-large data size in read from", 1134 (long) d->aoemajor, d->aoeminor, 1135 n, f->iter.bi_size); 1136 buf->bio->bi_status = BLK_STS_IOERR; 1137 break; 1138 } 1139 bvcpy(skb, f->buf->bio, f->iter, n); 1140 fallthrough; 1141 case ATA_CMD_PIO_WRITE: 1142 case ATA_CMD_PIO_WRITE_EXT: 1143 spin_lock_irq(&d->lock); 1144 ifp = getif(t, skb->dev); 1145 if (ifp) 1146 ifp->lost = 0; 1147 spin_unlock_irq(&d->lock); 1148 break; 1149 case ATA_CMD_ID_ATA: 1150 if (skb->len < 512) { 1151 pr_info("%s e%ld.%d. skb->len=%d need=512\n", 1152 "aoe: runt data size in ataid from", 1153 (long) d->aoemajor, d->aoeminor, 1154 skb->len); 1155 break; 1156 } 1157 if (skb_linearize(skb)) 1158 break; 1159 spin_lock_irq(&d->lock); 1160 ataid_complete(d, t, skb->data); 1161 spin_unlock_irq(&d->lock); 1162 break; 1163 default: 1164 pr_info("aoe: unrecognized ata command %2.2Xh for %d.%d\n", 1165 ahout->cmdstat, 1166 be16_to_cpu(get_unaligned(&hin->major)), 1167 hin->minor); 1168 } 1169 out: 1170 spin_lock_irq(&d->lock); 1171 if (t->taint > 0 1172 && --t->taint > 0 1173 && t->nout_probes == 0) { 1174 count_targets(d, &untainted); 1175 if (untainted > 0) { 1176 probe(t); 1177 t->nout_probes++; 1178 } 1179 } 1180 1181 aoe_freetframe(f); 1182 1183 if (buf && --buf->nframesout == 0 && buf->iter.bi_size == 0) 1184 aoe_end_buf(d, buf); 1185 1186 spin_unlock_irq(&d->lock); 1187 aoedev_put(d); 1188 dev_kfree_skb(skb); 1189 } 1190 1191 /* Enters with iocq.lock held. 1192 * Returns true iff responses needing processing remain. 1193 */ 1194 static int 1195 ktio(int id) 1196 { 1197 struct frame *f; 1198 struct list_head *pos; 1199 int i; 1200 int actual_id; 1201 1202 for (i = 0; ; ++i) { 1203 if (i == MAXIOC) 1204 return 1; 1205 if (list_empty(&iocq[id].head)) 1206 return 0; 1207 pos = iocq[id].head.next; 1208 list_del(pos); 1209 f = list_entry(pos, struct frame, head); 1210 spin_unlock_irq(&iocq[id].lock); 1211 ktiocomplete(f); 1212 1213 /* Figure out if extra threads are required. */ 1214 actual_id = f->t->d->aoeminor % ncpus; 1215 1216 if (!kts[actual_id].active) { 1217 BUG_ON(id != 0); 1218 mutex_lock(&ktio_spawn_lock); 1219 if (!kts[actual_id].active 1220 && aoe_ktstart(&kts[actual_id]) == 0) 1221 kts[actual_id].active = 1; 1222 mutex_unlock(&ktio_spawn_lock); 1223 } 1224 spin_lock_irq(&iocq[id].lock); 1225 } 1226 } 1227 1228 static int 1229 kthread(void *vp) 1230 { 1231 struct ktstate *k; 1232 DECLARE_WAITQUEUE(wait, current); 1233 int more; 1234 1235 k = vp; 1236 current->flags |= PF_NOFREEZE; 1237 set_user_nice(current, -10); 1238 complete(&k->rendez); /* tell spawner we're running */ 1239 do { 1240 spin_lock_irq(k->lock); 1241 more = k->fn(k->id); 1242 if (!more) { 1243 add_wait_queue(k->waitq, &wait); 1244 __set_current_state(TASK_INTERRUPTIBLE); 1245 } 1246 spin_unlock_irq(k->lock); 1247 if (!more) { 1248 schedule(); 1249 remove_wait_queue(k->waitq, &wait); 1250 } else 1251 cond_resched(); 1252 } while (!kthread_should_stop()); 1253 complete(&k->rendez); /* tell spawner we're stopping */ 1254 return 0; 1255 } 1256 1257 void 1258 aoe_ktstop(struct ktstate *k) 1259 { 1260 kthread_stop(k->task); 1261 wait_for_completion(&k->rendez); 1262 } 1263 1264 int 1265 aoe_ktstart(struct ktstate *k) 1266 { 1267 struct task_struct *task; 1268 1269 init_completion(&k->rendez); 1270 task = kthread_run(kthread, k, "%s", k->name); 1271 if (task == NULL || IS_ERR(task)) 1272 return -ENOMEM; 1273 k->task = task; 1274 wait_for_completion(&k->rendez); /* allow kthread to start */ 1275 init_completion(&k->rendez); /* for waiting for exit later */ 1276 return 0; 1277 } 1278 1279 /* pass it off to kthreads for processing */ 1280 static void 1281 ktcomplete(struct frame *f, struct sk_buff *skb) 1282 { 1283 int id; 1284 ulong flags; 1285 1286 f->r_skb = skb; 1287 id = f->t->d->aoeminor % ncpus; 1288 spin_lock_irqsave(&iocq[id].lock, flags); 1289 if (!kts[id].active) { 1290 spin_unlock_irqrestore(&iocq[id].lock, flags); 1291 /* The thread with id has not been spawned yet, 1292 * so delegate the work to the main thread and 1293 * try spawning a new thread. 1294 */ 1295 id = 0; 1296 spin_lock_irqsave(&iocq[id].lock, flags); 1297 } 1298 list_add_tail(&f->head, &iocq[id].head); 1299 spin_unlock_irqrestore(&iocq[id].lock, flags); 1300 wake_up(&ktiowq[id]); 1301 } 1302 1303 struct sk_buff * 1304 aoecmd_ata_rsp(struct sk_buff *skb) 1305 { 1306 struct aoedev *d; 1307 struct aoe_hdr *h; 1308 struct frame *f; 1309 u32 n; 1310 ulong flags; 1311 char ebuf[128]; 1312 u16 aoemajor; 1313 1314 h = (struct aoe_hdr *) skb->data; 1315 aoemajor = be16_to_cpu(get_unaligned(&h->major)); 1316 d = aoedev_by_aoeaddr(aoemajor, h->minor, 0); 1317 if (d == NULL) { 1318 snprintf(ebuf, sizeof ebuf, "aoecmd_ata_rsp: ata response " 1319 "for unknown device %d.%d\n", 1320 aoemajor, h->minor); 1321 aoechr_error(ebuf); 1322 return skb; 1323 } 1324 1325 spin_lock_irqsave(&d->lock, flags); 1326 1327 n = be32_to_cpu(get_unaligned(&h->tag)); 1328 f = getframe(d, n); 1329 if (f) { 1330 calc_rttavg(d, f->t, tsince_hr(f)); 1331 f->t->nout--; 1332 if (f->flags & FFL_PROBE) 1333 f->t->nout_probes--; 1334 } else { 1335 f = getframe_deferred(d, n); 1336 if (f) { 1337 calc_rttavg(d, NULL, tsince_hr(f)); 1338 } else { 1339 calc_rttavg(d, NULL, tsince(n)); 1340 spin_unlock_irqrestore(&d->lock, flags); 1341 aoedev_put(d); 1342 snprintf(ebuf, sizeof(ebuf), 1343 "%15s e%d.%d tag=%08x@%08lx s=%pm d=%pm\n", 1344 "unexpected rsp", 1345 get_unaligned_be16(&h->major), 1346 h->minor, 1347 get_unaligned_be32(&h->tag), 1348 jiffies, 1349 h->src, 1350 h->dst); 1351 aoechr_error(ebuf); 1352 return skb; 1353 } 1354 } 1355 aoecmd_work(d); 1356 1357 spin_unlock_irqrestore(&d->lock, flags); 1358 1359 ktcomplete(f, skb); 1360 1361 /* 1362 * Note here that we do not perform an aoedev_put, as we are 1363 * leaving this reference for the ktio to release. 1364 */ 1365 return NULL; 1366 } 1367 1368 void 1369 aoecmd_cfg(ushort aoemajor, unsigned char aoeminor) 1370 { 1371 struct sk_buff_head queue; 1372 1373 __skb_queue_head_init(&queue); 1374 aoecmd_cfg_pkts(aoemajor, aoeminor, &queue); 1375 aoenet_xmit(&queue); 1376 } 1377 1378 struct sk_buff * 1379 aoecmd_ata_id(struct aoedev *d) 1380 { 1381 struct aoe_hdr *h; 1382 struct aoe_atahdr *ah; 1383 struct frame *f; 1384 struct sk_buff *skb; 1385 struct aoetgt *t; 1386 1387 f = newframe(d); 1388 if (f == NULL) 1389 return NULL; 1390 1391 t = *d->tgt; 1392 1393 /* initialize the headers & frame */ 1394 skb = f->skb; 1395 h = (struct aoe_hdr *) skb_mac_header(skb); 1396 ah = (struct aoe_atahdr *) (h+1); 1397 skb_put(skb, sizeof *h + sizeof *ah); 1398 memset(h, 0, skb->len); 1399 f->tag = aoehdr_atainit(d, t, h); 1400 fhash(f); 1401 t->nout++; 1402 f->waited = 0; 1403 f->waited_total = 0; 1404 1405 /* set up ata header */ 1406 ah->scnt = 1; 1407 ah->cmdstat = ATA_CMD_ID_ATA; 1408 ah->lba3 = 0xa0; 1409 1410 dev_hold(t->ifp->nd); 1411 skb->dev = t->ifp->nd; 1412 1413 d->rttavg = RTTAVG_INIT; 1414 d->rttdev = RTTDEV_INIT; 1415 d->timer.function = rexmit_timer; 1416 1417 skb = skb_clone(skb, GFP_ATOMIC); 1418 if (skb) 1419 f->sent = ktime_get(); 1420 else 1421 dev_put(t->ifp->nd); 1422 1423 return skb; 1424 } 1425 1426 static struct aoetgt ** 1427 grow_targets(struct aoedev *d) 1428 { 1429 ulong oldn, newn; 1430 struct aoetgt **tt; 1431 1432 oldn = d->ntargets; 1433 newn = oldn * 2; 1434 tt = kcalloc(newn, sizeof(*d->targets), GFP_ATOMIC); 1435 if (!tt) 1436 return NULL; 1437 memmove(tt, d->targets, sizeof(*d->targets) * oldn); 1438 d->tgt = tt + (d->tgt - d->targets); 1439 kfree(d->targets); 1440 d->targets = tt; 1441 d->ntargets = newn; 1442 1443 return &d->targets[oldn]; 1444 } 1445 1446 static struct aoetgt * 1447 addtgt(struct aoedev *d, char *addr, ulong nframes) 1448 { 1449 struct aoetgt *t, **tt, **te; 1450 1451 tt = d->targets; 1452 te = tt + d->ntargets; 1453 for (; tt < te && *tt; tt++) 1454 ; 1455 1456 if (tt == te) { 1457 tt = grow_targets(d); 1458 if (!tt) 1459 goto nomem; 1460 } 1461 t = kzalloc(sizeof(*t), GFP_ATOMIC); 1462 if (!t) 1463 goto nomem; 1464 t->nframes = nframes; 1465 t->d = d; 1466 memcpy(t->addr, addr, sizeof t->addr); 1467 t->ifp = t->ifs; 1468 aoecmd_wreset(t); 1469 t->maxout = t->nframes / 2; 1470 INIT_LIST_HEAD(&t->ffree); 1471 return *tt = t; 1472 1473 nomem: 1474 pr_info("aoe: cannot allocate memory to add target\n"); 1475 return NULL; 1476 } 1477 1478 static void 1479 setdbcnt(struct aoedev *d) 1480 { 1481 struct aoetgt **t, **e; 1482 int bcnt = 0; 1483 1484 t = d->targets; 1485 e = t + d->ntargets; 1486 for (; t < e && *t; t++) 1487 if (bcnt == 0 || bcnt > (*t)->minbcnt) 1488 bcnt = (*t)->minbcnt; 1489 if (bcnt != d->maxbcnt) { 1490 d->maxbcnt = bcnt; 1491 pr_info("aoe: e%ld.%d: setting %d byte data frames\n", 1492 d->aoemajor, d->aoeminor, bcnt); 1493 } 1494 } 1495 1496 static void 1497 setifbcnt(struct aoetgt *t, struct net_device *nd, int bcnt) 1498 { 1499 struct aoedev *d; 1500 struct aoeif *p, *e; 1501 int minbcnt; 1502 1503 d = t->d; 1504 minbcnt = bcnt; 1505 p = t->ifs; 1506 e = p + NAOEIFS; 1507 for (; p < e; p++) { 1508 if (p->nd == NULL) 1509 break; /* end of the valid interfaces */ 1510 if (p->nd == nd) { 1511 p->bcnt = bcnt; /* we're updating */ 1512 nd = NULL; 1513 } else if (minbcnt > p->bcnt) 1514 minbcnt = p->bcnt; /* find the min interface */ 1515 } 1516 if (nd) { 1517 if (p == e) { 1518 pr_err("aoe: device setifbcnt failure; too many interfaces.\n"); 1519 return; 1520 } 1521 dev_hold(nd); 1522 p->nd = nd; 1523 p->bcnt = bcnt; 1524 } 1525 t->minbcnt = minbcnt; 1526 setdbcnt(d); 1527 } 1528 1529 void 1530 aoecmd_cfg_rsp(struct sk_buff *skb) 1531 { 1532 struct aoedev *d; 1533 struct aoe_hdr *h; 1534 struct aoe_cfghdr *ch; 1535 struct aoetgt *t; 1536 ulong flags, aoemajor; 1537 struct sk_buff *sl; 1538 struct sk_buff_head queue; 1539 u16 n; 1540 1541 sl = NULL; 1542 h = (struct aoe_hdr *) skb_mac_header(skb); 1543 ch = (struct aoe_cfghdr *) (h+1); 1544 1545 /* 1546 * Enough people have their dip switches set backwards to 1547 * warrant a loud message for this special case. 1548 */ 1549 aoemajor = get_unaligned_be16(&h->major); 1550 if (aoemajor == 0xfff) { 1551 printk(KERN_ERR "aoe: Warning: shelf address is all ones. " 1552 "Check shelf dip switches.\n"); 1553 return; 1554 } 1555 if (aoemajor == 0xffff) { 1556 pr_info("aoe: e%ld.%d: broadcast shelf number invalid\n", 1557 aoemajor, (int) h->minor); 1558 return; 1559 } 1560 if (h->minor == 0xff) { 1561 pr_info("aoe: e%ld.%d: broadcast slot number invalid\n", 1562 aoemajor, (int) h->minor); 1563 return; 1564 } 1565 1566 n = be16_to_cpu(ch->bufcnt); 1567 if (n > aoe_maxout) /* keep it reasonable */ 1568 n = aoe_maxout; 1569 1570 d = aoedev_by_aoeaddr(aoemajor, h->minor, 1); 1571 if (d == NULL) { 1572 pr_info("aoe: device allocation failure\n"); 1573 return; 1574 } 1575 1576 spin_lock_irqsave(&d->lock, flags); 1577 1578 t = gettgt(d, h->src); 1579 if (t) { 1580 t->nframes = n; 1581 if (n < t->maxout) 1582 aoecmd_wreset(t); 1583 } else { 1584 t = addtgt(d, h->src, n); 1585 if (!t) 1586 goto bail; 1587 } 1588 n = skb->dev->mtu; 1589 n -= sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr); 1590 n /= 512; 1591 if (n > ch->scnt) 1592 n = ch->scnt; 1593 n = n ? n * 512 : DEFAULTBCNT; 1594 setifbcnt(t, skb->dev, n); 1595 1596 /* don't change users' perspective */ 1597 if (d->nopen == 0) { 1598 d->fw_ver = be16_to_cpu(ch->fwver); 1599 sl = aoecmd_ata_id(d); 1600 } 1601 bail: 1602 spin_unlock_irqrestore(&d->lock, flags); 1603 aoedev_put(d); 1604 if (sl) { 1605 __skb_queue_head_init(&queue); 1606 __skb_queue_tail(&queue, sl); 1607 aoenet_xmit(&queue); 1608 } 1609 } 1610 1611 void 1612 aoecmd_wreset(struct aoetgt *t) 1613 { 1614 t->maxout = 1; 1615 t->ssthresh = t->nframes / 2; 1616 t->next_cwnd = t->nframes; 1617 } 1618 1619 void 1620 aoecmd_cleanslate(struct aoedev *d) 1621 { 1622 struct aoetgt **t, **te; 1623 1624 d->rttavg = RTTAVG_INIT; 1625 d->rttdev = RTTDEV_INIT; 1626 d->maxbcnt = 0; 1627 1628 t = d->targets; 1629 te = t + d->ntargets; 1630 for (; t < te && *t; t++) 1631 aoecmd_wreset(*t); 1632 } 1633 1634 void 1635 aoe_failbuf(struct aoedev *d, struct buf *buf) 1636 { 1637 if (buf == NULL) 1638 return; 1639 buf->iter.bi_size = 0; 1640 buf->bio->bi_status = BLK_STS_IOERR; 1641 if (buf->nframesout == 0) 1642 aoe_end_buf(d, buf); 1643 } 1644 1645 void 1646 aoe_flush_iocq(void) 1647 { 1648 int i; 1649 1650 for (i = 0; i < ncpus; i++) { 1651 if (kts[i].active) 1652 aoe_flush_iocq_by_index(i); 1653 } 1654 } 1655 1656 void 1657 aoe_flush_iocq_by_index(int id) 1658 { 1659 struct frame *f; 1660 struct aoedev *d; 1661 LIST_HEAD(flist); 1662 struct list_head *pos; 1663 struct sk_buff *skb; 1664 ulong flags; 1665 1666 spin_lock_irqsave(&iocq[id].lock, flags); 1667 list_splice_init(&iocq[id].head, &flist); 1668 spin_unlock_irqrestore(&iocq[id].lock, flags); 1669 while (!list_empty(&flist)) { 1670 pos = flist.next; 1671 list_del(pos); 1672 f = list_entry(pos, struct frame, head); 1673 d = f->t->d; 1674 skb = f->r_skb; 1675 spin_lock_irqsave(&d->lock, flags); 1676 if (f->buf) { 1677 f->buf->nframesout--; 1678 aoe_failbuf(d, f->buf); 1679 } 1680 aoe_freetframe(f); 1681 spin_unlock_irqrestore(&d->lock, flags); 1682 dev_kfree_skb(skb); 1683 aoedev_put(d); 1684 } 1685 } 1686 1687 int __init 1688 aoecmd_init(void) 1689 { 1690 void *p; 1691 int i; 1692 int ret; 1693 1694 /* get_zeroed_page returns page with ref count 1 */ 1695 p = (void *) get_zeroed_page(GFP_KERNEL); 1696 if (!p) 1697 return -ENOMEM; 1698 empty_page = virt_to_page(p); 1699 1700 ncpus = num_online_cpus(); 1701 1702 iocq = kcalloc(ncpus, sizeof(struct iocq_ktio), GFP_KERNEL); 1703 if (!iocq) 1704 return -ENOMEM; 1705 1706 kts = kcalloc(ncpus, sizeof(struct ktstate), GFP_KERNEL); 1707 if (!kts) { 1708 ret = -ENOMEM; 1709 goto kts_fail; 1710 } 1711 1712 ktiowq = kcalloc(ncpus, sizeof(wait_queue_head_t), GFP_KERNEL); 1713 if (!ktiowq) { 1714 ret = -ENOMEM; 1715 goto ktiowq_fail; 1716 } 1717 1718 for (i = 0; i < ncpus; i++) { 1719 INIT_LIST_HEAD(&iocq[i].head); 1720 spin_lock_init(&iocq[i].lock); 1721 init_waitqueue_head(&ktiowq[i]); 1722 snprintf(kts[i].name, sizeof(kts[i].name), "aoe_ktio%d", i); 1723 kts[i].fn = ktio; 1724 kts[i].waitq = &ktiowq[i]; 1725 kts[i].lock = &iocq[i].lock; 1726 kts[i].id = i; 1727 kts[i].active = 0; 1728 } 1729 kts[0].active = 1; 1730 if (aoe_ktstart(&kts[0])) { 1731 ret = -ENOMEM; 1732 goto ktstart_fail; 1733 } 1734 return 0; 1735 1736 ktstart_fail: 1737 kfree(ktiowq); 1738 ktiowq_fail: 1739 kfree(kts); 1740 kts_fail: 1741 kfree(iocq); 1742 1743 return ret; 1744 } 1745 1746 void 1747 aoecmd_exit(void) 1748 { 1749 int i; 1750 1751 for (i = 0; i < ncpus; i++) 1752 if (kts[i].active) 1753 aoe_ktstop(&kts[i]); 1754 1755 aoe_flush_iocq(); 1756 1757 /* Free up the iocq and thread speicific configuration 1758 * allocated during startup. 1759 */ 1760 kfree(iocq); 1761 kfree(kts); 1762 kfree(ktiowq); 1763 1764 free_page((unsigned long) page_address(empty_page)); 1765 empty_page = NULL; 1766 } 1767