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 <asm/unaligned.h> 18 #include <linux/uio.h> 19 #include "aoe.h" 20 21 #define MAXIOC (8192) /* default meant to avoid most soft lockups */ 22 23 static void ktcomplete(struct frame *, struct sk_buff *); 24 static int count_targets(struct aoedev *d, int *untainted); 25 26 static struct buf *nextbuf(struct aoedev *); 27 28 static int aoe_deadsecs = 60 * 3; 29 module_param(aoe_deadsecs, int, 0644); 30 MODULE_PARM_DESC(aoe_deadsecs, "After aoe_deadsecs seconds, give up and fail dev."); 31 32 static int aoe_maxout = 64; 33 module_param(aoe_maxout, int, 0644); 34 MODULE_PARM_DESC(aoe_maxout, 35 "Only aoe_maxout outstanding packets for every MAC on eX.Y."); 36 37 /* The number of online cpus during module initialization gives us a 38 * convenient heuristic cap on the parallelism used for ktio threads 39 * doing I/O completion. It is not important that the cap equal the 40 * actual number of running CPUs at any given time, but because of CPU 41 * hotplug, we take care to use ncpus instead of using 42 * num_online_cpus() after module initialization. 43 */ 44 static int ncpus; 45 46 /* mutex lock used for synchronization while thread spawning */ 47 static DEFINE_MUTEX(ktio_spawn_lock); 48 49 static wait_queue_head_t *ktiowq; 50 static struct ktstate *kts; 51 52 /* io completion queue */ 53 struct iocq_ktio { 54 struct list_head head; 55 spinlock_t lock; 56 }; 57 static struct iocq_ktio *iocq; 58 59 static struct page *empty_page; 60 61 static struct sk_buff * 62 new_skb(ulong len) 63 { 64 struct sk_buff *skb; 65 66 skb = alloc_skb(len + MAX_HEADER, GFP_ATOMIC); 67 if (skb) { 68 skb_reserve(skb, MAX_HEADER); 69 skb_reset_mac_header(skb); 70 skb_reset_network_header(skb); 71 skb->protocol = __constant_htons(ETH_P_AOE); 72 skb_checksum_none_assert(skb); 73 } 74 return skb; 75 } 76 77 static struct frame * 78 getframe_deferred(struct aoedev *d, u32 tag) 79 { 80 struct list_head *head, *pos, *nx; 81 struct frame *f; 82 83 head = &d->rexmitq; 84 list_for_each_safe(pos, nx, head) { 85 f = list_entry(pos, struct frame, head); 86 if (f->tag == tag) { 87 list_del(pos); 88 return f; 89 } 90 } 91 return NULL; 92 } 93 94 static struct frame * 95 getframe(struct aoedev *d, u32 tag) 96 { 97 struct frame *f; 98 struct list_head *head, *pos, *nx; 99 u32 n; 100 101 n = tag % NFACTIVE; 102 head = &d->factive[n]; 103 list_for_each_safe(pos, nx, head) { 104 f = list_entry(pos, struct frame, head); 105 if (f->tag == tag) { 106 list_del(pos); 107 return f; 108 } 109 } 110 return NULL; 111 } 112 113 /* 114 * Leave the top bit clear so we have tagspace for userland. 115 * The bottom 16 bits are the xmit tick for rexmit/rttavg processing. 116 * This driver reserves tag -1 to mean "unused frame." 117 */ 118 static int 119 newtag(struct aoedev *d) 120 { 121 register ulong n; 122 123 n = jiffies & 0xffff; 124 return n | (++d->lasttag & 0x7fff) << 16; 125 } 126 127 static u32 128 aoehdr_atainit(struct aoedev *d, struct aoetgt *t, struct aoe_hdr *h) 129 { 130 u32 host_tag = newtag(d); 131 132 memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src); 133 memcpy(h->dst, t->addr, sizeof h->dst); 134 h->type = __constant_cpu_to_be16(ETH_P_AOE); 135 h->verfl = AOE_HVER; 136 h->major = cpu_to_be16(d->aoemajor); 137 h->minor = d->aoeminor; 138 h->cmd = AOECMD_ATA; 139 h->tag = cpu_to_be32(host_tag); 140 141 return host_tag; 142 } 143 144 static inline void 145 put_lba(struct aoe_atahdr *ah, sector_t lba) 146 { 147 ah->lba0 = lba; 148 ah->lba1 = lba >>= 8; 149 ah->lba2 = lba >>= 8; 150 ah->lba3 = lba >>= 8; 151 ah->lba4 = lba >>= 8; 152 ah->lba5 = lba >>= 8; 153 } 154 155 static struct aoeif * 156 ifrotate(struct aoetgt *t) 157 { 158 struct aoeif *ifp; 159 160 ifp = t->ifp; 161 ifp++; 162 if (ifp >= &t->ifs[NAOEIFS] || ifp->nd == NULL) 163 ifp = t->ifs; 164 if (ifp->nd == NULL) 165 return NULL; 166 return t->ifp = ifp; 167 } 168 169 static void 170 skb_pool_put(struct aoedev *d, struct sk_buff *skb) 171 { 172 __skb_queue_tail(&d->skbpool, skb); 173 } 174 175 static struct sk_buff * 176 skb_pool_get(struct aoedev *d) 177 { 178 struct sk_buff *skb = skb_peek(&d->skbpool); 179 180 if (skb && atomic_read(&skb_shinfo(skb)->dataref) == 1) { 181 __skb_unlink(skb, &d->skbpool); 182 return skb; 183 } 184 if (skb_queue_len(&d->skbpool) < NSKBPOOLMAX && 185 (skb = new_skb(ETH_ZLEN))) 186 return skb; 187 188 return NULL; 189 } 190 191 void 192 aoe_freetframe(struct frame *f) 193 { 194 struct aoetgt *t; 195 196 t = f->t; 197 f->buf = NULL; 198 memset(&f->iter, 0, sizeof(f->iter)); 199 f->r_skb = NULL; 200 f->flags = 0; 201 list_add(&f->head, &t->ffree); 202 } 203 204 static struct frame * 205 newtframe(struct aoedev *d, struct aoetgt *t) 206 { 207 struct frame *f; 208 struct sk_buff *skb; 209 struct list_head *pos; 210 211 if (list_empty(&t->ffree)) { 212 if (t->falloc >= NSKBPOOLMAX*2) 213 return NULL; 214 f = kcalloc(1, sizeof(*f), GFP_ATOMIC); 215 if (f == NULL) 216 return NULL; 217 t->falloc++; 218 f->t = t; 219 } else { 220 pos = t->ffree.next; 221 list_del(pos); 222 f = list_entry(pos, struct frame, head); 223 } 224 225 skb = f->skb; 226 if (skb == NULL) { 227 f->skb = skb = new_skb(ETH_ZLEN); 228 if (!skb) { 229 bail: aoe_freetframe(f); 230 return NULL; 231 } 232 } 233 234 if (atomic_read(&skb_shinfo(skb)->dataref) != 1) { 235 skb = skb_pool_get(d); 236 if (skb == NULL) 237 goto bail; 238 skb_pool_put(d, f->skb); 239 f->skb = skb; 240 } 241 242 skb->truesize -= skb->data_len; 243 skb_shinfo(skb)->nr_frags = skb->data_len = 0; 244 skb_trim(skb, 0); 245 return f; 246 } 247 248 static struct frame * 249 newframe(struct aoedev *d) 250 { 251 struct frame *f; 252 struct aoetgt *t, **tt; 253 int totout = 0; 254 int use_tainted; 255 int has_untainted; 256 257 if (!d->targets || !d->targets[0]) { 258 printk(KERN_ERR "aoe: NULL TARGETS!\n"); 259 return NULL; 260 } 261 tt = d->tgt; /* last used target */ 262 for (use_tainted = 0, has_untainted = 0;;) { 263 tt++; 264 if (tt >= &d->targets[d->ntargets] || !*tt) 265 tt = d->targets; 266 t = *tt; 267 if (!t->taint) { 268 has_untainted = 1; 269 totout += t->nout; 270 } 271 if (t->nout < t->maxout 272 && (use_tainted || !t->taint) 273 && t->ifp->nd) { 274 f = newtframe(d, t); 275 if (f) { 276 ifrotate(t); 277 d->tgt = tt; 278 return f; 279 } 280 } 281 if (tt == d->tgt) { /* we've looped and found nada */ 282 if (!use_tainted && !has_untainted) 283 use_tainted = 1; 284 else 285 break; 286 } 287 } 288 if (totout == 0) { 289 d->kicked++; 290 d->flags |= DEVFL_KICKME; 291 } 292 return NULL; 293 } 294 295 static void 296 skb_fillup(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter) 297 { 298 int frag = 0; 299 struct bio_vec bv; 300 301 __bio_for_each_segment(bv, bio, iter, iter) 302 skb_fill_page_desc(skb, frag++, bv.bv_page, 303 bv.bv_offset, bv.bv_len); 304 } 305 306 static void 307 fhash(struct frame *f) 308 { 309 struct aoedev *d = f->t->d; 310 u32 n; 311 312 n = f->tag % NFACTIVE; 313 list_add_tail(&f->head, &d->factive[n]); 314 } 315 316 static void 317 ata_rw_frameinit(struct frame *f) 318 { 319 struct aoetgt *t; 320 struct aoe_hdr *h; 321 struct aoe_atahdr *ah; 322 struct sk_buff *skb; 323 char writebit, extbit; 324 325 skb = f->skb; 326 h = (struct aoe_hdr *) skb_mac_header(skb); 327 ah = (struct aoe_atahdr *) (h + 1); 328 skb_put(skb, sizeof(*h) + sizeof(*ah)); 329 memset(h, 0, skb->len); 330 331 writebit = 0x10; 332 extbit = 0x4; 333 334 t = f->t; 335 f->tag = aoehdr_atainit(t->d, t, h); 336 fhash(f); 337 t->nout++; 338 f->waited = 0; 339 f->waited_total = 0; 340 341 /* set up ata header */ 342 ah->scnt = f->iter.bi_size >> 9; 343 put_lba(ah, f->iter.bi_sector); 344 if (t->d->flags & DEVFL_EXT) { 345 ah->aflags |= AOEAFL_EXT; 346 } else { 347 extbit = 0; 348 ah->lba3 &= 0x0f; 349 ah->lba3 |= 0xe0; /* LBA bit + obsolete 0xa0 */ 350 } 351 if (f->buf && bio_data_dir(f->buf->bio) == WRITE) { 352 skb_fillup(skb, f->buf->bio, f->iter); 353 ah->aflags |= AOEAFL_WRITE; 354 skb->len += f->iter.bi_size; 355 skb->data_len = f->iter.bi_size; 356 skb->truesize += f->iter.bi_size; 357 t->wpkts++; 358 } else { 359 t->rpkts++; 360 writebit = 0; 361 } 362 363 ah->cmdstat = ATA_CMD_PIO_READ | writebit | extbit; 364 dev_hold(t->ifp->nd); 365 skb->dev = t->ifp->nd; 366 } 367 368 static int 369 aoecmd_ata_rw(struct aoedev *d) 370 { 371 struct frame *f; 372 struct buf *buf; 373 struct sk_buff *skb; 374 struct sk_buff_head queue; 375 376 buf = nextbuf(d); 377 if (buf == NULL) 378 return 0; 379 f = newframe(d); 380 if (f == NULL) 381 return 0; 382 383 /* initialize the headers & frame */ 384 f->buf = buf; 385 f->iter = buf->iter; 386 f->iter.bi_size = min_t(unsigned long, 387 d->maxbcnt ?: DEFAULTBCNT, 388 f->iter.bi_size); 389 bio_advance_iter(buf->bio, &buf->iter, f->iter.bi_size); 390 391 if (!buf->iter.bi_size) 392 d->ip.buf = NULL; 393 394 /* mark all tracking fields and load out */ 395 buf->nframesout += 1; 396 397 ata_rw_frameinit(f); 398 399 skb = skb_clone(f->skb, GFP_ATOMIC); 400 if (skb) { 401 f->sent = ktime_get(); 402 __skb_queue_head_init(&queue); 403 __skb_queue_tail(&queue, skb); 404 aoenet_xmit(&queue); 405 } else { 406 dev_put(f->t->ifp->nd); 407 } 408 return 1; 409 } 410 411 /* some callers cannot sleep, and they can call this function, 412 * transmitting the packets later, when interrupts are on 413 */ 414 static void 415 aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff_head *queue) 416 { 417 struct aoe_hdr *h; 418 struct aoe_cfghdr *ch; 419 struct sk_buff *skb; 420 struct net_device *ifp; 421 422 rcu_read_lock(); 423 for_each_netdev_rcu(&init_net, ifp) { 424 dev_hold(ifp); 425 if (!is_aoe_netif(ifp)) { 426 dev_put(ifp); 427 continue; 428 } 429 430 skb = new_skb(sizeof *h + sizeof *ch); 431 if (skb == NULL) { 432 printk(KERN_INFO "aoe: skb alloc failure\n"); 433 dev_put(ifp); 434 continue; 435 } 436 skb_put(skb, sizeof *h + sizeof *ch); 437 skb->dev = ifp; 438 __skb_queue_tail(queue, skb); 439 h = (struct aoe_hdr *) skb_mac_header(skb); 440 memset(h, 0, sizeof *h + sizeof *ch); 441 442 memset(h->dst, 0xff, sizeof h->dst); 443 memcpy(h->src, ifp->dev_addr, sizeof h->src); 444 h->type = __constant_cpu_to_be16(ETH_P_AOE); 445 h->verfl = AOE_HVER; 446 h->major = cpu_to_be16(aoemajor); 447 h->minor = aoeminor; 448 h->cmd = AOECMD_CFG; 449 } 450 rcu_read_unlock(); 451 } 452 453 static void 454 resend(struct aoedev *d, struct frame *f) 455 { 456 struct sk_buff *skb; 457 struct sk_buff_head queue; 458 struct aoe_hdr *h; 459 struct aoetgt *t; 460 char buf[128]; 461 u32 n; 462 463 t = f->t; 464 n = newtag(d); 465 skb = f->skb; 466 if (ifrotate(t) == NULL) { 467 /* probably can't happen, but set it up to fail anyway */ 468 pr_info("aoe: resend: no interfaces to rotate to.\n"); 469 ktcomplete(f, NULL); 470 return; 471 } 472 h = (struct aoe_hdr *) skb_mac_header(skb); 473 474 if (!(f->flags & FFL_PROBE)) { 475 snprintf(buf, sizeof(buf), 476 "%15s e%ld.%d oldtag=%08x@%08lx newtag=%08x s=%pm d=%pm nout=%d\n", 477 "retransmit", d->aoemajor, d->aoeminor, 478 f->tag, jiffies, n, 479 h->src, h->dst, t->nout); 480 aoechr_error(buf); 481 } 482 483 f->tag = n; 484 fhash(f); 485 h->tag = cpu_to_be32(n); 486 memcpy(h->dst, t->addr, sizeof h->dst); 487 memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src); 488 489 dev_hold(t->ifp->nd); 490 skb->dev = t->ifp->nd; 491 skb = skb_clone(skb, GFP_ATOMIC); 492 if (skb == NULL) { 493 dev_put(t->ifp->nd); 494 return; 495 } 496 f->sent = ktime_get(); 497 __skb_queue_head_init(&queue); 498 __skb_queue_tail(&queue, skb); 499 aoenet_xmit(&queue); 500 } 501 502 static int 503 tsince_hr(struct frame *f) 504 { 505 u64 delta = ktime_to_ns(ktime_sub(ktime_get(), f->sent)); 506 507 /* delta is normally under 4.2 seconds, avoid 64-bit division */ 508 if (likely(delta <= UINT_MAX)) 509 return (u32)delta / NSEC_PER_USEC; 510 511 /* avoid overflow after 71 minutes */ 512 if (delta > ((u64)INT_MAX * NSEC_PER_USEC)) 513 return INT_MAX; 514 515 return div_u64(delta, NSEC_PER_USEC); 516 } 517 518 static int 519 tsince(u32 tag) 520 { 521 int n; 522 523 n = jiffies & 0xffff; 524 n -= tag & 0xffff; 525 if (n < 0) 526 n += 1<<16; 527 return jiffies_to_usecs(n + 1); 528 } 529 530 static struct aoeif * 531 getif(struct aoetgt *t, struct net_device *nd) 532 { 533 struct aoeif *p, *e; 534 535 p = t->ifs; 536 e = p + NAOEIFS; 537 for (; p < e; p++) 538 if (p->nd == nd) 539 return p; 540 return NULL; 541 } 542 543 static void 544 ejectif(struct aoetgt *t, struct aoeif *ifp) 545 { 546 struct aoeif *e; 547 struct net_device *nd; 548 ulong n; 549 550 nd = ifp->nd; 551 e = t->ifs + NAOEIFS - 1; 552 n = (e - ifp) * sizeof *ifp; 553 memmove(ifp, ifp+1, n); 554 e->nd = NULL; 555 dev_put(nd); 556 } 557 558 static struct frame * 559 reassign_frame(struct frame *f) 560 { 561 struct frame *nf; 562 struct sk_buff *skb; 563 564 nf = newframe(f->t->d); 565 if (!nf) 566 return NULL; 567 if (nf->t == f->t) { 568 aoe_freetframe(nf); 569 return NULL; 570 } 571 572 skb = nf->skb; 573 nf->skb = f->skb; 574 nf->buf = f->buf; 575 nf->iter = f->iter; 576 nf->waited = 0; 577 nf->waited_total = f->waited_total; 578 nf->sent = f->sent; 579 f->skb = skb; 580 581 return nf; 582 } 583 584 static void 585 probe(struct aoetgt *t) 586 { 587 struct aoedev *d; 588 struct frame *f; 589 struct sk_buff *skb; 590 struct sk_buff_head queue; 591 size_t n, m; 592 int frag; 593 594 d = t->d; 595 f = newtframe(d, t); 596 if (!f) { 597 pr_err("%s %pm for e%ld.%d: %s\n", 598 "aoe: cannot probe remote address", 599 t->addr, 600 (long) d->aoemajor, d->aoeminor, 601 "no frame available"); 602 return; 603 } 604 f->flags |= FFL_PROBE; 605 ifrotate(t); 606 f->iter.bi_size = t->d->maxbcnt ? t->d->maxbcnt : DEFAULTBCNT; 607 ata_rw_frameinit(f); 608 skb = f->skb; 609 for (frag = 0, n = f->iter.bi_size; n > 0; ++frag, n -= m) { 610 if (n < PAGE_SIZE) 611 m = n; 612 else 613 m = PAGE_SIZE; 614 skb_fill_page_desc(skb, frag, empty_page, 0, m); 615 } 616 skb->len += f->iter.bi_size; 617 skb->data_len = f->iter.bi_size; 618 skb->truesize += f->iter.bi_size; 619 620 skb = skb_clone(f->skb, GFP_ATOMIC); 621 if (skb) { 622 f->sent = ktime_get(); 623 __skb_queue_head_init(&queue); 624 __skb_queue_tail(&queue, skb); 625 aoenet_xmit(&queue); 626 } else { 627 dev_put(f->t->ifp->nd); 628 } 629 } 630 631 static long 632 rto(struct aoedev *d) 633 { 634 long t; 635 636 t = 2 * d->rttavg >> RTTSCALE; 637 t += 8 * d->rttdev >> RTTDSCALE; 638 if (t == 0) 639 t = 1; 640 641 return t; 642 } 643 644 static void 645 rexmit_deferred(struct aoedev *d) 646 { 647 struct aoetgt *t; 648 struct frame *f; 649 struct frame *nf; 650 struct list_head *pos, *nx, *head; 651 int since; 652 int untainted; 653 654 count_targets(d, &untainted); 655 656 head = &d->rexmitq; 657 list_for_each_safe(pos, nx, head) { 658 f = list_entry(pos, struct frame, head); 659 t = f->t; 660 if (t->taint) { 661 if (!(f->flags & FFL_PROBE)) { 662 nf = reassign_frame(f); 663 if (nf) { 664 if (t->nout_probes == 0 665 && untainted > 0) { 666 probe(t); 667 t->nout_probes++; 668 } 669 list_replace(&f->head, &nf->head); 670 pos = &nf->head; 671 aoe_freetframe(f); 672 f = nf; 673 t = f->t; 674 } 675 } else if (untainted < 1) { 676 /* don't probe w/o other untainted aoetgts */ 677 goto stop_probe; 678 } else if (tsince_hr(f) < t->taint * rto(d)) { 679 /* reprobe slowly when taint is high */ 680 continue; 681 } 682 } else if (f->flags & FFL_PROBE) { 683 stop_probe: /* don't probe untainted aoetgts */ 684 list_del(pos); 685 aoe_freetframe(f); 686 /* leaving d->kicked, because this is routine */ 687 f->t->d->flags |= DEVFL_KICKME; 688 continue; 689 } 690 if (t->nout >= t->maxout) 691 continue; 692 list_del(pos); 693 t->nout++; 694 if (f->flags & FFL_PROBE) 695 t->nout_probes++; 696 since = tsince_hr(f); 697 f->waited += since; 698 f->waited_total += since; 699 resend(d, f); 700 } 701 } 702 703 /* An aoetgt accumulates demerits quickly, and successful 704 * probing redeems the aoetgt slowly. 705 */ 706 static void 707 scorn(struct aoetgt *t) 708 { 709 int n; 710 711 n = t->taint++; 712 t->taint += t->taint * 2; 713 if (n > t->taint) 714 t->taint = n; 715 if (t->taint > MAX_TAINT) 716 t->taint = MAX_TAINT; 717 } 718 719 static int 720 count_targets(struct aoedev *d, int *untainted) 721 { 722 int i, good; 723 724 for (i = good = 0; i < d->ntargets && d->targets[i]; ++i) 725 if (d->targets[i]->taint == 0) 726 good++; 727 728 if (untainted) 729 *untainted = good; 730 return i; 731 } 732 733 static void 734 rexmit_timer(struct timer_list *timer) 735 { 736 struct aoedev *d; 737 struct aoetgt *t; 738 struct aoeif *ifp; 739 struct frame *f; 740 struct list_head *head, *pos, *nx; 741 LIST_HEAD(flist); 742 register long timeout; 743 ulong flags, n; 744 int i; 745 int utgts; /* number of aoetgt descriptors (not slots) */ 746 int since; 747 748 d = from_timer(d, timer, timer); 749 750 spin_lock_irqsave(&d->lock, flags); 751 752 /* timeout based on observed timings and variations */ 753 timeout = rto(d); 754 755 utgts = count_targets(d, NULL); 756 757 if (d->flags & DEVFL_TKILL) { 758 spin_unlock_irqrestore(&d->lock, flags); 759 return; 760 } 761 762 /* collect all frames to rexmit into flist */ 763 for (i = 0; i < NFACTIVE; i++) { 764 head = &d->factive[i]; 765 list_for_each_safe(pos, nx, head) { 766 f = list_entry(pos, struct frame, head); 767 if (tsince_hr(f) < timeout) 768 break; /* end of expired frames */ 769 /* move to flist for later processing */ 770 list_move_tail(pos, &flist); 771 } 772 } 773 774 /* process expired frames */ 775 while (!list_empty(&flist)) { 776 pos = flist.next; 777 f = list_entry(pos, struct frame, head); 778 since = tsince_hr(f); 779 n = f->waited_total + since; 780 n /= USEC_PER_SEC; 781 if (aoe_deadsecs 782 && n > aoe_deadsecs 783 && !(f->flags & FFL_PROBE)) { 784 /* Waited too long. Device failure. 785 * Hang all frames on first hash bucket for downdev 786 * to clean up. 787 */ 788 list_splice(&flist, &d->factive[0]); 789 aoedev_downdev(d); 790 goto out; 791 } 792 793 t = f->t; 794 n = f->waited + since; 795 n /= USEC_PER_SEC; 796 if (aoe_deadsecs && utgts > 0 797 && (n > aoe_deadsecs / utgts || n > HARD_SCORN_SECS)) 798 scorn(t); /* avoid this target */ 799 800 if (t->maxout != 1) { 801 t->ssthresh = t->maxout / 2; 802 t->maxout = 1; 803 } 804 805 if (f->flags & FFL_PROBE) { 806 t->nout_probes--; 807 } else { 808 ifp = getif(t, f->skb->dev); 809 if (ifp && ++ifp->lost > (t->nframes << 1) 810 && (ifp != t->ifs || t->ifs[1].nd)) { 811 ejectif(t, ifp); 812 ifp = NULL; 813 } 814 } 815 list_move_tail(pos, &d->rexmitq); 816 t->nout--; 817 } 818 rexmit_deferred(d); 819 820 out: 821 if ((d->flags & DEVFL_KICKME) && d->blkq) { 822 d->flags &= ~DEVFL_KICKME; 823 blk_mq_run_hw_queues(d->blkq, true); 824 } 825 826 d->timer.expires = jiffies + TIMERTICK; 827 add_timer(&d->timer); 828 829 spin_unlock_irqrestore(&d->lock, flags); 830 } 831 832 static void 833 bufinit(struct buf *buf, struct request *rq, struct bio *bio) 834 { 835 memset(buf, 0, sizeof(*buf)); 836 buf->rq = rq; 837 buf->bio = bio; 838 buf->iter = bio->bi_iter; 839 } 840 841 static struct buf * 842 nextbuf(struct aoedev *d) 843 { 844 struct request *rq; 845 struct request_queue *q; 846 struct aoe_req *req; 847 struct buf *buf; 848 struct bio *bio; 849 850 q = d->blkq; 851 if (q == NULL) 852 return NULL; /* initializing */ 853 if (d->ip.buf) 854 return d->ip.buf; 855 rq = d->ip.rq; 856 if (rq == NULL) { 857 rq = list_first_entry_or_null(&d->rq_list, struct request, 858 queuelist); 859 if (rq == NULL) 860 return NULL; 861 list_del_init(&rq->queuelist); 862 blk_mq_start_request(rq); 863 d->ip.rq = rq; 864 d->ip.nxbio = rq->bio; 865 866 req = blk_mq_rq_to_pdu(rq); 867 req->nr_bios = 0; 868 __rq_for_each_bio(bio, rq) 869 req->nr_bios++; 870 } 871 buf = mempool_alloc(d->bufpool, GFP_ATOMIC); 872 if (buf == NULL) { 873 pr_err("aoe: nextbuf: unable to mempool_alloc!\n"); 874 return NULL; 875 } 876 bio = d->ip.nxbio; 877 bufinit(buf, rq, bio); 878 bio = bio->bi_next; 879 d->ip.nxbio = bio; 880 if (bio == NULL) 881 d->ip.rq = NULL; 882 return d->ip.buf = buf; 883 } 884 885 /* enters with d->lock held */ 886 void 887 aoecmd_work(struct aoedev *d) 888 { 889 rexmit_deferred(d); 890 while (aoecmd_ata_rw(d)) 891 ; 892 } 893 894 /* this function performs work that has been deferred until sleeping is OK 895 */ 896 void 897 aoecmd_sleepwork(struct work_struct *work) 898 { 899 struct aoedev *d = container_of(work, struct aoedev, work); 900 901 if (d->flags & DEVFL_GDALLOC) 902 aoeblk_gdalloc(d); 903 904 if (d->flags & DEVFL_NEWSIZE) { 905 set_capacity_and_notify(d->gd, d->ssize); 906 907 spin_lock_irq(&d->lock); 908 d->flags |= DEVFL_UP; 909 d->flags &= ~DEVFL_NEWSIZE; 910 spin_unlock_irq(&d->lock); 911 } 912 } 913 914 static void 915 ata_ident_fixstring(u16 *id, int ns) 916 { 917 u16 s; 918 919 while (ns-- > 0) { 920 s = *id; 921 *id++ = s >> 8 | s << 8; 922 } 923 } 924 925 static void 926 ataid_complete(struct aoedev *d, struct aoetgt *t, unsigned char *id) 927 { 928 u64 ssize; 929 u16 n; 930 931 /* word 83: command set supported */ 932 n = get_unaligned_le16(&id[83 << 1]); 933 934 /* word 86: command set/feature enabled */ 935 n |= get_unaligned_le16(&id[86 << 1]); 936 937 if (n & (1<<10)) { /* bit 10: LBA 48 */ 938 d->flags |= DEVFL_EXT; 939 940 /* word 100: number lba48 sectors */ 941 ssize = get_unaligned_le64(&id[100 << 1]); 942 943 /* set as in ide-disk.c:init_idedisk_capacity */ 944 d->geo.cylinders = ssize; 945 d->geo.cylinders /= (255 * 63); 946 d->geo.heads = 255; 947 d->geo.sectors = 63; 948 } else { 949 d->flags &= ~DEVFL_EXT; 950 951 /* number lba28 sectors */ 952 ssize = get_unaligned_le32(&id[60 << 1]); 953 954 /* NOTE: obsolete in ATA 6 */ 955 d->geo.cylinders = get_unaligned_le16(&id[54 << 1]); 956 d->geo.heads = get_unaligned_le16(&id[55 << 1]); 957 d->geo.sectors = get_unaligned_le16(&id[56 << 1]); 958 } 959 960 ata_ident_fixstring((u16 *) &id[10<<1], 10); /* serial */ 961 ata_ident_fixstring((u16 *) &id[23<<1], 4); /* firmware */ 962 ata_ident_fixstring((u16 *) &id[27<<1], 20); /* model */ 963 memcpy(d->ident, id, sizeof(d->ident)); 964 965 if (d->ssize != ssize) 966 printk(KERN_INFO 967 "aoe: %pm e%ld.%d v%04x has %llu sectors\n", 968 t->addr, 969 d->aoemajor, d->aoeminor, 970 d->fw_ver, (long long)ssize); 971 d->ssize = ssize; 972 d->geo.start = 0; 973 if (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE)) 974 return; 975 if (d->gd != NULL) 976 d->flags |= DEVFL_NEWSIZE; 977 else 978 d->flags |= DEVFL_GDALLOC; 979 queue_work(aoe_wq, &d->work); 980 } 981 982 static void 983 calc_rttavg(struct aoedev *d, struct aoetgt *t, int rtt) 984 { 985 register long n; 986 987 n = rtt; 988 989 /* cf. Congestion Avoidance and Control, Jacobson & Karels, 1988 */ 990 n -= d->rttavg >> RTTSCALE; 991 d->rttavg += n; 992 if (n < 0) 993 n = -n; 994 n -= d->rttdev >> RTTDSCALE; 995 d->rttdev += n; 996 997 if (!t || t->maxout >= t->nframes) 998 return; 999 if (t->maxout < t->ssthresh) 1000 t->maxout += 1; 1001 else if (t->nout == t->maxout && t->next_cwnd-- == 0) { 1002 t->maxout += 1; 1003 t->next_cwnd = t->maxout; 1004 } 1005 } 1006 1007 static struct aoetgt * 1008 gettgt(struct aoedev *d, char *addr) 1009 { 1010 struct aoetgt **t, **e; 1011 1012 t = d->targets; 1013 e = t + d->ntargets; 1014 for (; t < e && *t; t++) 1015 if (memcmp((*t)->addr, addr, sizeof((*t)->addr)) == 0) 1016 return *t; 1017 return NULL; 1018 } 1019 1020 static void 1021 bvcpy(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter, long cnt) 1022 { 1023 int soff = 0; 1024 struct bio_vec bv; 1025 1026 iter.bi_size = cnt; 1027 1028 __bio_for_each_segment(bv, bio, iter, iter) { 1029 char *p = bvec_kmap_local(&bv); 1030 skb_copy_bits(skb, soff, p, bv.bv_len); 1031 kunmap_local(p); 1032 soff += bv.bv_len; 1033 } 1034 } 1035 1036 void 1037 aoe_end_request(struct aoedev *d, struct request *rq, int fastfail) 1038 { 1039 struct bio *bio; 1040 int bok; 1041 struct request_queue *q; 1042 blk_status_t err = BLK_STS_OK; 1043 1044 q = d->blkq; 1045 if (rq == d->ip.rq) 1046 d->ip.rq = NULL; 1047 do { 1048 bio = rq->bio; 1049 bok = !fastfail && !bio->bi_status; 1050 if (!bok) 1051 err = BLK_STS_IOERR; 1052 } while (blk_update_request(rq, bok ? BLK_STS_OK : BLK_STS_IOERR, bio->bi_iter.bi_size)); 1053 1054 __blk_mq_end_request(rq, err); 1055 1056 /* cf. https://lore.kernel.org/lkml/20061031071040.GS14055@kernel.dk/ */ 1057 if (!fastfail) 1058 blk_mq_run_hw_queues(q, true); 1059 } 1060 1061 static void 1062 aoe_end_buf(struct aoedev *d, struct buf *buf) 1063 { 1064 struct request *rq = buf->rq; 1065 struct aoe_req *req = blk_mq_rq_to_pdu(rq); 1066 1067 if (buf == d->ip.buf) 1068 d->ip.buf = NULL; 1069 mempool_free(buf, d->bufpool); 1070 if (--req->nr_bios == 0) 1071 aoe_end_request(d, rq, 0); 1072 } 1073 1074 static void 1075 ktiocomplete(struct frame *f) 1076 { 1077 struct aoe_hdr *hin, *hout; 1078 struct aoe_atahdr *ahin, *ahout; 1079 struct buf *buf; 1080 struct sk_buff *skb; 1081 struct aoetgt *t; 1082 struct aoeif *ifp; 1083 struct aoedev *d; 1084 long n; 1085 int untainted; 1086 1087 if (f == NULL) 1088 return; 1089 1090 t = f->t; 1091 d = t->d; 1092 skb = f->r_skb; 1093 buf = f->buf; 1094 if (f->flags & FFL_PROBE) 1095 goto out; 1096 if (!skb) /* just fail the buf. */ 1097 goto noskb; 1098 1099 hout = (struct aoe_hdr *) skb_mac_header(f->skb); 1100 ahout = (struct aoe_atahdr *) (hout+1); 1101 1102 hin = (struct aoe_hdr *) skb->data; 1103 skb_pull(skb, sizeof(*hin)); 1104 ahin = (struct aoe_atahdr *) skb->data; 1105 skb_pull(skb, sizeof(*ahin)); 1106 if (ahin->cmdstat & 0xa9) { /* these bits cleared on success */ 1107 pr_err("aoe: ata error cmd=%2.2Xh stat=%2.2Xh from e%ld.%d\n", 1108 ahout->cmdstat, ahin->cmdstat, 1109 d->aoemajor, d->aoeminor); 1110 noskb: if (buf) 1111 buf->bio->bi_status = BLK_STS_IOERR; 1112 goto out; 1113 } 1114 1115 n = ahout->scnt << 9; 1116 switch (ahout->cmdstat) { 1117 case ATA_CMD_PIO_READ: 1118 case ATA_CMD_PIO_READ_EXT: 1119 if (skb->len < n) { 1120 pr_err("%s e%ld.%d. skb->len=%d need=%ld\n", 1121 "aoe: runt data size in read from", 1122 (long) d->aoemajor, d->aoeminor, 1123 skb->len, n); 1124 buf->bio->bi_status = BLK_STS_IOERR; 1125 break; 1126 } 1127 if (n > f->iter.bi_size) { 1128 pr_err_ratelimited("%s e%ld.%d. bytes=%ld need=%u\n", 1129 "aoe: too-large data size in read from", 1130 (long) d->aoemajor, d->aoeminor, 1131 n, f->iter.bi_size); 1132 buf->bio->bi_status = BLK_STS_IOERR; 1133 break; 1134 } 1135 bvcpy(skb, f->buf->bio, f->iter, n); 1136 fallthrough; 1137 case ATA_CMD_PIO_WRITE: 1138 case ATA_CMD_PIO_WRITE_EXT: 1139 spin_lock_irq(&d->lock); 1140 ifp = getif(t, skb->dev); 1141 if (ifp) 1142 ifp->lost = 0; 1143 spin_unlock_irq(&d->lock); 1144 break; 1145 case ATA_CMD_ID_ATA: 1146 if (skb->len < 512) { 1147 pr_info("%s e%ld.%d. skb->len=%d need=512\n", 1148 "aoe: runt data size in ataid from", 1149 (long) d->aoemajor, d->aoeminor, 1150 skb->len); 1151 break; 1152 } 1153 if (skb_linearize(skb)) 1154 break; 1155 spin_lock_irq(&d->lock); 1156 ataid_complete(d, t, skb->data); 1157 spin_unlock_irq(&d->lock); 1158 break; 1159 default: 1160 pr_info("aoe: unrecognized ata command %2.2Xh for %d.%d\n", 1161 ahout->cmdstat, 1162 be16_to_cpu(get_unaligned(&hin->major)), 1163 hin->minor); 1164 } 1165 out: 1166 spin_lock_irq(&d->lock); 1167 if (t->taint > 0 1168 && --t->taint > 0 1169 && t->nout_probes == 0) { 1170 count_targets(d, &untainted); 1171 if (untainted > 0) { 1172 probe(t); 1173 t->nout_probes++; 1174 } 1175 } 1176 1177 aoe_freetframe(f); 1178 1179 if (buf && --buf->nframesout == 0 && buf->iter.bi_size == 0) 1180 aoe_end_buf(d, buf); 1181 1182 spin_unlock_irq(&d->lock); 1183 aoedev_put(d); 1184 dev_kfree_skb(skb); 1185 } 1186 1187 /* Enters with iocq.lock held. 1188 * Returns true iff responses needing processing remain. 1189 */ 1190 static int 1191 ktio(int id) 1192 { 1193 struct frame *f; 1194 struct list_head *pos; 1195 int i; 1196 int actual_id; 1197 1198 for (i = 0; ; ++i) { 1199 if (i == MAXIOC) 1200 return 1; 1201 if (list_empty(&iocq[id].head)) 1202 return 0; 1203 pos = iocq[id].head.next; 1204 list_del(pos); 1205 f = list_entry(pos, struct frame, head); 1206 spin_unlock_irq(&iocq[id].lock); 1207 ktiocomplete(f); 1208 1209 /* Figure out if extra threads are required. */ 1210 actual_id = f->t->d->aoeminor % ncpus; 1211 1212 if (!kts[actual_id].active) { 1213 BUG_ON(id != 0); 1214 mutex_lock(&ktio_spawn_lock); 1215 if (!kts[actual_id].active 1216 && aoe_ktstart(&kts[actual_id]) == 0) 1217 kts[actual_id].active = 1; 1218 mutex_unlock(&ktio_spawn_lock); 1219 } 1220 spin_lock_irq(&iocq[id].lock); 1221 } 1222 } 1223 1224 static int 1225 kthread(void *vp) 1226 { 1227 struct ktstate *k; 1228 DECLARE_WAITQUEUE(wait, current); 1229 int more; 1230 1231 k = vp; 1232 current->flags |= PF_NOFREEZE; 1233 set_user_nice(current, -10); 1234 complete(&k->rendez); /* tell spawner we're running */ 1235 do { 1236 spin_lock_irq(k->lock); 1237 more = k->fn(k->id); 1238 if (!more) { 1239 add_wait_queue(k->waitq, &wait); 1240 __set_current_state(TASK_INTERRUPTIBLE); 1241 } 1242 spin_unlock_irq(k->lock); 1243 if (!more) { 1244 schedule(); 1245 remove_wait_queue(k->waitq, &wait); 1246 } else 1247 cond_resched(); 1248 } while (!kthread_should_stop()); 1249 complete(&k->rendez); /* tell spawner we're stopping */ 1250 return 0; 1251 } 1252 1253 void 1254 aoe_ktstop(struct ktstate *k) 1255 { 1256 kthread_stop(k->task); 1257 wait_for_completion(&k->rendez); 1258 } 1259 1260 int 1261 aoe_ktstart(struct ktstate *k) 1262 { 1263 struct task_struct *task; 1264 1265 init_completion(&k->rendez); 1266 task = kthread_run(kthread, k, "%s", k->name); 1267 if (task == NULL || IS_ERR(task)) 1268 return -ENOMEM; 1269 k->task = task; 1270 wait_for_completion(&k->rendez); /* allow kthread to start */ 1271 init_completion(&k->rendez); /* for waiting for exit later */ 1272 return 0; 1273 } 1274 1275 /* pass it off to kthreads for processing */ 1276 static void 1277 ktcomplete(struct frame *f, struct sk_buff *skb) 1278 { 1279 int id; 1280 ulong flags; 1281 1282 f->r_skb = skb; 1283 id = f->t->d->aoeminor % ncpus; 1284 spin_lock_irqsave(&iocq[id].lock, flags); 1285 if (!kts[id].active) { 1286 spin_unlock_irqrestore(&iocq[id].lock, flags); 1287 /* The thread with id has not been spawned yet, 1288 * so delegate the work to the main thread and 1289 * try spawning a new thread. 1290 */ 1291 id = 0; 1292 spin_lock_irqsave(&iocq[id].lock, flags); 1293 } 1294 list_add_tail(&f->head, &iocq[id].head); 1295 spin_unlock_irqrestore(&iocq[id].lock, flags); 1296 wake_up(&ktiowq[id]); 1297 } 1298 1299 struct sk_buff * 1300 aoecmd_ata_rsp(struct sk_buff *skb) 1301 { 1302 struct aoedev *d; 1303 struct aoe_hdr *h; 1304 struct frame *f; 1305 u32 n; 1306 ulong flags; 1307 char ebuf[128]; 1308 u16 aoemajor; 1309 1310 h = (struct aoe_hdr *) skb->data; 1311 aoemajor = be16_to_cpu(get_unaligned(&h->major)); 1312 d = aoedev_by_aoeaddr(aoemajor, h->minor, 0); 1313 if (d == NULL) { 1314 snprintf(ebuf, sizeof ebuf, "aoecmd_ata_rsp: ata response " 1315 "for unknown device %d.%d\n", 1316 aoemajor, h->minor); 1317 aoechr_error(ebuf); 1318 return skb; 1319 } 1320 1321 spin_lock_irqsave(&d->lock, flags); 1322 1323 n = be32_to_cpu(get_unaligned(&h->tag)); 1324 f = getframe(d, n); 1325 if (f) { 1326 calc_rttavg(d, f->t, tsince_hr(f)); 1327 f->t->nout--; 1328 if (f->flags & FFL_PROBE) 1329 f->t->nout_probes--; 1330 } else { 1331 f = getframe_deferred(d, n); 1332 if (f) { 1333 calc_rttavg(d, NULL, tsince_hr(f)); 1334 } else { 1335 calc_rttavg(d, NULL, tsince(n)); 1336 spin_unlock_irqrestore(&d->lock, flags); 1337 aoedev_put(d); 1338 snprintf(ebuf, sizeof(ebuf), 1339 "%15s e%d.%d tag=%08x@%08lx s=%pm d=%pm\n", 1340 "unexpected rsp", 1341 get_unaligned_be16(&h->major), 1342 h->minor, 1343 get_unaligned_be32(&h->tag), 1344 jiffies, 1345 h->src, 1346 h->dst); 1347 aoechr_error(ebuf); 1348 return skb; 1349 } 1350 } 1351 aoecmd_work(d); 1352 1353 spin_unlock_irqrestore(&d->lock, flags); 1354 1355 ktcomplete(f, skb); 1356 1357 /* 1358 * Note here that we do not perform an aoedev_put, as we are 1359 * leaving this reference for the ktio to release. 1360 */ 1361 return NULL; 1362 } 1363 1364 void 1365 aoecmd_cfg(ushort aoemajor, unsigned char aoeminor) 1366 { 1367 struct sk_buff_head queue; 1368 1369 __skb_queue_head_init(&queue); 1370 aoecmd_cfg_pkts(aoemajor, aoeminor, &queue); 1371 aoenet_xmit(&queue); 1372 } 1373 1374 struct sk_buff * 1375 aoecmd_ata_id(struct aoedev *d) 1376 { 1377 struct aoe_hdr *h; 1378 struct aoe_atahdr *ah; 1379 struct frame *f; 1380 struct sk_buff *skb; 1381 struct aoetgt *t; 1382 1383 f = newframe(d); 1384 if (f == NULL) 1385 return NULL; 1386 1387 t = *d->tgt; 1388 1389 /* initialize the headers & frame */ 1390 skb = f->skb; 1391 h = (struct aoe_hdr *) skb_mac_header(skb); 1392 ah = (struct aoe_atahdr *) (h+1); 1393 skb_put(skb, sizeof *h + sizeof *ah); 1394 memset(h, 0, skb->len); 1395 f->tag = aoehdr_atainit(d, t, h); 1396 fhash(f); 1397 t->nout++; 1398 f->waited = 0; 1399 f->waited_total = 0; 1400 1401 /* set up ata header */ 1402 ah->scnt = 1; 1403 ah->cmdstat = ATA_CMD_ID_ATA; 1404 ah->lba3 = 0xa0; 1405 1406 dev_hold(t->ifp->nd); 1407 skb->dev = t->ifp->nd; 1408 1409 d->rttavg = RTTAVG_INIT; 1410 d->rttdev = RTTDEV_INIT; 1411 d->timer.function = rexmit_timer; 1412 1413 skb = skb_clone(skb, GFP_ATOMIC); 1414 if (skb) 1415 f->sent = ktime_get(); 1416 else 1417 dev_put(t->ifp->nd); 1418 1419 return skb; 1420 } 1421 1422 static struct aoetgt ** 1423 grow_targets(struct aoedev *d) 1424 { 1425 ulong oldn, newn; 1426 struct aoetgt **tt; 1427 1428 oldn = d->ntargets; 1429 newn = oldn * 2; 1430 tt = kcalloc(newn, sizeof(*d->targets), GFP_ATOMIC); 1431 if (!tt) 1432 return NULL; 1433 memmove(tt, d->targets, sizeof(*d->targets) * oldn); 1434 d->tgt = tt + (d->tgt - d->targets); 1435 kfree(d->targets); 1436 d->targets = tt; 1437 d->ntargets = newn; 1438 1439 return &d->targets[oldn]; 1440 } 1441 1442 static struct aoetgt * 1443 addtgt(struct aoedev *d, char *addr, ulong nframes) 1444 { 1445 struct aoetgt *t, **tt, **te; 1446 1447 tt = d->targets; 1448 te = tt + d->ntargets; 1449 for (; tt < te && *tt; tt++) 1450 ; 1451 1452 if (tt == te) { 1453 tt = grow_targets(d); 1454 if (!tt) 1455 goto nomem; 1456 } 1457 t = kzalloc(sizeof(*t), GFP_ATOMIC); 1458 if (!t) 1459 goto nomem; 1460 t->nframes = nframes; 1461 t->d = d; 1462 memcpy(t->addr, addr, sizeof t->addr); 1463 t->ifp = t->ifs; 1464 aoecmd_wreset(t); 1465 t->maxout = t->nframes / 2; 1466 INIT_LIST_HEAD(&t->ffree); 1467 return *tt = t; 1468 1469 nomem: 1470 pr_info("aoe: cannot allocate memory to add target\n"); 1471 return NULL; 1472 } 1473 1474 static void 1475 setdbcnt(struct aoedev *d) 1476 { 1477 struct aoetgt **t, **e; 1478 int bcnt = 0; 1479 1480 t = d->targets; 1481 e = t + d->ntargets; 1482 for (; t < e && *t; t++) 1483 if (bcnt == 0 || bcnt > (*t)->minbcnt) 1484 bcnt = (*t)->minbcnt; 1485 if (bcnt != d->maxbcnt) { 1486 d->maxbcnt = bcnt; 1487 pr_info("aoe: e%ld.%d: setting %d byte data frames\n", 1488 d->aoemajor, d->aoeminor, bcnt); 1489 } 1490 } 1491 1492 static void 1493 setifbcnt(struct aoetgt *t, struct net_device *nd, int bcnt) 1494 { 1495 struct aoedev *d; 1496 struct aoeif *p, *e; 1497 int minbcnt; 1498 1499 d = t->d; 1500 minbcnt = bcnt; 1501 p = t->ifs; 1502 e = p + NAOEIFS; 1503 for (; p < e; p++) { 1504 if (p->nd == NULL) 1505 break; /* end of the valid interfaces */ 1506 if (p->nd == nd) { 1507 p->bcnt = bcnt; /* we're updating */ 1508 nd = NULL; 1509 } else if (minbcnt > p->bcnt) 1510 minbcnt = p->bcnt; /* find the min interface */ 1511 } 1512 if (nd) { 1513 if (p == e) { 1514 pr_err("aoe: device setifbcnt failure; too many interfaces.\n"); 1515 return; 1516 } 1517 dev_hold(nd); 1518 p->nd = nd; 1519 p->bcnt = bcnt; 1520 } 1521 t->minbcnt = minbcnt; 1522 setdbcnt(d); 1523 } 1524 1525 void 1526 aoecmd_cfg_rsp(struct sk_buff *skb) 1527 { 1528 struct aoedev *d; 1529 struct aoe_hdr *h; 1530 struct aoe_cfghdr *ch; 1531 struct aoetgt *t; 1532 ulong flags, aoemajor; 1533 struct sk_buff *sl; 1534 struct sk_buff_head queue; 1535 u16 n; 1536 1537 sl = NULL; 1538 h = (struct aoe_hdr *) skb_mac_header(skb); 1539 ch = (struct aoe_cfghdr *) (h+1); 1540 1541 /* 1542 * Enough people have their dip switches set backwards to 1543 * warrant a loud message for this special case. 1544 */ 1545 aoemajor = get_unaligned_be16(&h->major); 1546 if (aoemajor == 0xfff) { 1547 printk(KERN_ERR "aoe: Warning: shelf address is all ones. " 1548 "Check shelf dip switches.\n"); 1549 return; 1550 } 1551 if (aoemajor == 0xffff) { 1552 pr_info("aoe: e%ld.%d: broadcast shelf number invalid\n", 1553 aoemajor, (int) h->minor); 1554 return; 1555 } 1556 if (h->minor == 0xff) { 1557 pr_info("aoe: e%ld.%d: broadcast slot number invalid\n", 1558 aoemajor, (int) h->minor); 1559 return; 1560 } 1561 1562 n = be16_to_cpu(ch->bufcnt); 1563 if (n > aoe_maxout) /* keep it reasonable */ 1564 n = aoe_maxout; 1565 1566 d = aoedev_by_aoeaddr(aoemajor, h->minor, 1); 1567 if (d == NULL) { 1568 pr_info("aoe: device allocation failure\n"); 1569 return; 1570 } 1571 1572 spin_lock_irqsave(&d->lock, flags); 1573 1574 t = gettgt(d, h->src); 1575 if (t) { 1576 t->nframes = n; 1577 if (n < t->maxout) 1578 aoecmd_wreset(t); 1579 } else { 1580 t = addtgt(d, h->src, n); 1581 if (!t) 1582 goto bail; 1583 } 1584 n = skb->dev->mtu; 1585 n -= sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr); 1586 n /= 512; 1587 if (n > ch->scnt) 1588 n = ch->scnt; 1589 n = n ? n * 512 : DEFAULTBCNT; 1590 setifbcnt(t, skb->dev, n); 1591 1592 /* don't change users' perspective */ 1593 if (d->nopen == 0) { 1594 d->fw_ver = be16_to_cpu(ch->fwver); 1595 sl = aoecmd_ata_id(d); 1596 } 1597 bail: 1598 spin_unlock_irqrestore(&d->lock, flags); 1599 aoedev_put(d); 1600 if (sl) { 1601 __skb_queue_head_init(&queue); 1602 __skb_queue_tail(&queue, sl); 1603 aoenet_xmit(&queue); 1604 } 1605 } 1606 1607 void 1608 aoecmd_wreset(struct aoetgt *t) 1609 { 1610 t->maxout = 1; 1611 t->ssthresh = t->nframes / 2; 1612 t->next_cwnd = t->nframes; 1613 } 1614 1615 void 1616 aoecmd_cleanslate(struct aoedev *d) 1617 { 1618 struct aoetgt **t, **te; 1619 1620 d->rttavg = RTTAVG_INIT; 1621 d->rttdev = RTTDEV_INIT; 1622 d->maxbcnt = 0; 1623 1624 t = d->targets; 1625 te = t + d->ntargets; 1626 for (; t < te && *t; t++) 1627 aoecmd_wreset(*t); 1628 } 1629 1630 void 1631 aoe_failbuf(struct aoedev *d, struct buf *buf) 1632 { 1633 if (buf == NULL) 1634 return; 1635 buf->iter.bi_size = 0; 1636 buf->bio->bi_status = BLK_STS_IOERR; 1637 if (buf->nframesout == 0) 1638 aoe_end_buf(d, buf); 1639 } 1640 1641 void 1642 aoe_flush_iocq(void) 1643 { 1644 int i; 1645 1646 for (i = 0; i < ncpus; i++) { 1647 if (kts[i].active) 1648 aoe_flush_iocq_by_index(i); 1649 } 1650 } 1651 1652 void 1653 aoe_flush_iocq_by_index(int id) 1654 { 1655 struct frame *f; 1656 struct aoedev *d; 1657 LIST_HEAD(flist); 1658 struct list_head *pos; 1659 struct sk_buff *skb; 1660 ulong flags; 1661 1662 spin_lock_irqsave(&iocq[id].lock, flags); 1663 list_splice_init(&iocq[id].head, &flist); 1664 spin_unlock_irqrestore(&iocq[id].lock, flags); 1665 while (!list_empty(&flist)) { 1666 pos = flist.next; 1667 list_del(pos); 1668 f = list_entry(pos, struct frame, head); 1669 d = f->t->d; 1670 skb = f->r_skb; 1671 spin_lock_irqsave(&d->lock, flags); 1672 if (f->buf) { 1673 f->buf->nframesout--; 1674 aoe_failbuf(d, f->buf); 1675 } 1676 aoe_freetframe(f); 1677 spin_unlock_irqrestore(&d->lock, flags); 1678 dev_kfree_skb(skb); 1679 aoedev_put(d); 1680 } 1681 } 1682 1683 int __init 1684 aoecmd_init(void) 1685 { 1686 void *p; 1687 int i; 1688 int ret; 1689 1690 /* get_zeroed_page returns page with ref count 1 */ 1691 p = (void *) get_zeroed_page(GFP_KERNEL); 1692 if (!p) 1693 return -ENOMEM; 1694 empty_page = virt_to_page(p); 1695 1696 ncpus = num_online_cpus(); 1697 1698 iocq = kcalloc(ncpus, sizeof(struct iocq_ktio), GFP_KERNEL); 1699 if (!iocq) 1700 return -ENOMEM; 1701 1702 kts = kcalloc(ncpus, sizeof(struct ktstate), GFP_KERNEL); 1703 if (!kts) { 1704 ret = -ENOMEM; 1705 goto kts_fail; 1706 } 1707 1708 ktiowq = kcalloc(ncpus, sizeof(wait_queue_head_t), GFP_KERNEL); 1709 if (!ktiowq) { 1710 ret = -ENOMEM; 1711 goto ktiowq_fail; 1712 } 1713 1714 for (i = 0; i < ncpus; i++) { 1715 INIT_LIST_HEAD(&iocq[i].head); 1716 spin_lock_init(&iocq[i].lock); 1717 init_waitqueue_head(&ktiowq[i]); 1718 snprintf(kts[i].name, sizeof(kts[i].name), "aoe_ktio%d", i); 1719 kts[i].fn = ktio; 1720 kts[i].waitq = &ktiowq[i]; 1721 kts[i].lock = &iocq[i].lock; 1722 kts[i].id = i; 1723 kts[i].active = 0; 1724 } 1725 kts[0].active = 1; 1726 if (aoe_ktstart(&kts[0])) { 1727 ret = -ENOMEM; 1728 goto ktstart_fail; 1729 } 1730 return 0; 1731 1732 ktstart_fail: 1733 kfree(ktiowq); 1734 ktiowq_fail: 1735 kfree(kts); 1736 kts_fail: 1737 kfree(iocq); 1738 1739 return ret; 1740 } 1741 1742 void 1743 aoecmd_exit(void) 1744 { 1745 int i; 1746 1747 for (i = 0; i < ncpus; i++) 1748 if (kts[i].active) 1749 aoe_ktstop(&kts[i]); 1750 1751 aoe_flush_iocq(); 1752 1753 /* Free up the iocq and thread speicific configuration 1754 * allocated during startup. 1755 */ 1756 kfree(iocq); 1757 kfree(kts); 1758 kfree(ktiowq); 1759 1760 free_page((unsigned long) page_address(empty_page)); 1761 empty_page = NULL; 1762 } 1763