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/blkdev.h> 11 #include <linux/skbuff.h> 12 #include <linux/netdevice.h> 13 #include <linux/genhd.h> 14 #include <linux/moduleparam.h> 15 #include <linux/workqueue.h> 16 #include <linux/kthread.h> 17 #include <net/net_namespace.h> 18 #include <asm/unaligned.h> 19 #include <linux/uio.h> 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 f->lba = 0; 200 f->bv = NULL; 201 f->r_skb = NULL; 202 f->flags = 0; 203 list_add(&f->head, &t->ffree); 204 } 205 206 static struct frame * 207 newtframe(struct aoedev *d, struct aoetgt *t) 208 { 209 struct frame *f; 210 struct sk_buff *skb; 211 struct list_head *pos; 212 213 if (list_empty(&t->ffree)) { 214 if (t->falloc >= NSKBPOOLMAX*2) 215 return NULL; 216 f = kcalloc(1, sizeof(*f), GFP_ATOMIC); 217 if (f == NULL) 218 return NULL; 219 t->falloc++; 220 f->t = t; 221 } else { 222 pos = t->ffree.next; 223 list_del(pos); 224 f = list_entry(pos, struct frame, head); 225 } 226 227 skb = f->skb; 228 if (skb == NULL) { 229 f->skb = skb = new_skb(ETH_ZLEN); 230 if (!skb) { 231 bail: aoe_freetframe(f); 232 return NULL; 233 } 234 } 235 236 if (atomic_read(&skb_shinfo(skb)->dataref) != 1) { 237 skb = skb_pool_get(d); 238 if (skb == NULL) 239 goto bail; 240 skb_pool_put(d, f->skb); 241 f->skb = skb; 242 } 243 244 skb->truesize -= skb->data_len; 245 skb_shinfo(skb)->nr_frags = skb->data_len = 0; 246 skb_trim(skb, 0); 247 return f; 248 } 249 250 static struct frame * 251 newframe(struct aoedev *d) 252 { 253 struct frame *f; 254 struct aoetgt *t, **tt; 255 int totout = 0; 256 int use_tainted; 257 int has_untainted; 258 259 if (!d->targets || !d->targets[0]) { 260 printk(KERN_ERR "aoe: NULL TARGETS!\n"); 261 return NULL; 262 } 263 tt = d->tgt; /* last used target */ 264 for (use_tainted = 0, has_untainted = 0;;) { 265 tt++; 266 if (tt >= &d->targets[d->ntargets] || !*tt) 267 tt = d->targets; 268 t = *tt; 269 if (!t->taint) { 270 has_untainted = 1; 271 totout += t->nout; 272 } 273 if (t->nout < t->maxout 274 && (use_tainted || !t->taint) 275 && t->ifp->nd) { 276 f = newtframe(d, t); 277 if (f) { 278 ifrotate(t); 279 d->tgt = tt; 280 return f; 281 } 282 } 283 if (tt == d->tgt) { /* we've looped and found nada */ 284 if (!use_tainted && !has_untainted) 285 use_tainted = 1; 286 else 287 break; 288 } 289 } 290 if (totout == 0) { 291 d->kicked++; 292 d->flags |= DEVFL_KICKME; 293 } 294 return NULL; 295 } 296 297 static void 298 skb_fillup(struct sk_buff *skb, struct bio_vec *bv, ulong off, ulong cnt) 299 { 300 int frag = 0; 301 ulong fcnt; 302 loop: 303 fcnt = bv->bv_len - (off - bv->bv_offset); 304 if (fcnt > cnt) 305 fcnt = cnt; 306 skb_fill_page_desc(skb, frag++, bv->bv_page, off, fcnt); 307 cnt -= fcnt; 308 if (cnt <= 0) 309 return; 310 bv++; 311 off = bv->bv_offset; 312 goto loop; 313 } 314 315 static void 316 fhash(struct frame *f) 317 { 318 struct aoedev *d = f->t->d; 319 u32 n; 320 321 n = f->tag % NFACTIVE; 322 list_add_tail(&f->head, &d->factive[n]); 323 } 324 325 static void 326 ata_rw_frameinit(struct frame *f) 327 { 328 struct aoetgt *t; 329 struct aoe_hdr *h; 330 struct aoe_atahdr *ah; 331 struct sk_buff *skb; 332 char writebit, extbit; 333 334 skb = f->skb; 335 h = (struct aoe_hdr *) skb_mac_header(skb); 336 ah = (struct aoe_atahdr *) (h + 1); 337 skb_put(skb, sizeof(*h) + sizeof(*ah)); 338 memset(h, 0, skb->len); 339 340 writebit = 0x10; 341 extbit = 0x4; 342 343 t = f->t; 344 f->tag = aoehdr_atainit(t->d, t, h); 345 fhash(f); 346 t->nout++; 347 f->waited = 0; 348 f->waited_total = 0; 349 if (f->buf) 350 f->lba = f->buf->sector; 351 352 /* set up ata header */ 353 ah->scnt = f->bcnt >> 9; 354 put_lba(ah, f->lba); 355 if (t->d->flags & DEVFL_EXT) { 356 ah->aflags |= AOEAFL_EXT; 357 } else { 358 extbit = 0; 359 ah->lba3 &= 0x0f; 360 ah->lba3 |= 0xe0; /* LBA bit + obsolete 0xa0 */ 361 } 362 if (f->buf && bio_data_dir(f->buf->bio) == WRITE) { 363 skb_fillup(skb, f->bv, f->bv_off, f->bcnt); 364 ah->aflags |= AOEAFL_WRITE; 365 skb->len += f->bcnt; 366 skb->data_len = f->bcnt; 367 skb->truesize += f->bcnt; 368 t->wpkts++; 369 } else { 370 t->rpkts++; 371 writebit = 0; 372 } 373 374 ah->cmdstat = ATA_CMD_PIO_READ | writebit | extbit; 375 skb->dev = t->ifp->nd; 376 } 377 378 static int 379 aoecmd_ata_rw(struct aoedev *d) 380 { 381 struct frame *f; 382 struct buf *buf; 383 struct sk_buff *skb; 384 struct sk_buff_head queue; 385 ulong bcnt, fbcnt; 386 387 buf = nextbuf(d); 388 if (buf == NULL) 389 return 0; 390 f = newframe(d); 391 if (f == NULL) 392 return 0; 393 bcnt = d->maxbcnt; 394 if (bcnt == 0) 395 bcnt = DEFAULTBCNT; 396 if (bcnt > buf->resid) 397 bcnt = buf->resid; 398 fbcnt = bcnt; 399 f->bv = buf->bv; 400 f->bv_off = f->bv->bv_offset + (f->bv->bv_len - buf->bv_resid); 401 do { 402 if (fbcnt < buf->bv_resid) { 403 buf->bv_resid -= fbcnt; 404 buf->resid -= fbcnt; 405 break; 406 } 407 fbcnt -= buf->bv_resid; 408 buf->resid -= buf->bv_resid; 409 if (buf->resid == 0) { 410 d->ip.buf = NULL; 411 break; 412 } 413 buf->bv++; 414 buf->bv_resid = buf->bv->bv_len; 415 WARN_ON(buf->bv_resid == 0); 416 } while (fbcnt); 417 418 /* initialize the headers & frame */ 419 f->buf = buf; 420 f->bcnt = bcnt; 421 ata_rw_frameinit(f); 422 423 /* mark all tracking fields and load out */ 424 buf->nframesout += 1; 425 buf->sector += bcnt >> 9; 426 427 skb = skb_clone(f->skb, GFP_ATOMIC); 428 if (skb) { 429 do_gettimeofday(&f->sent); 430 f->sent_jiffs = (u32) jiffies; 431 __skb_queue_head_init(&queue); 432 __skb_queue_tail(&queue, skb); 433 aoenet_xmit(&queue); 434 } 435 return 1; 436 } 437 438 /* some callers cannot sleep, and they can call this function, 439 * transmitting the packets later, when interrupts are on 440 */ 441 static void 442 aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff_head *queue) 443 { 444 struct aoe_hdr *h; 445 struct aoe_cfghdr *ch; 446 struct sk_buff *skb; 447 struct net_device *ifp; 448 449 rcu_read_lock(); 450 for_each_netdev_rcu(&init_net, ifp) { 451 dev_hold(ifp); 452 if (!is_aoe_netif(ifp)) 453 goto cont; 454 455 skb = new_skb(sizeof *h + sizeof *ch); 456 if (skb == NULL) { 457 printk(KERN_INFO "aoe: skb alloc failure\n"); 458 goto cont; 459 } 460 skb_put(skb, sizeof *h + sizeof *ch); 461 skb->dev = ifp; 462 __skb_queue_tail(queue, skb); 463 h = (struct aoe_hdr *) skb_mac_header(skb); 464 memset(h, 0, sizeof *h + sizeof *ch); 465 466 memset(h->dst, 0xff, sizeof h->dst); 467 memcpy(h->src, ifp->dev_addr, sizeof h->src); 468 h->type = __constant_cpu_to_be16(ETH_P_AOE); 469 h->verfl = AOE_HVER; 470 h->major = cpu_to_be16(aoemajor); 471 h->minor = aoeminor; 472 h->cmd = AOECMD_CFG; 473 474 cont: 475 dev_put(ifp); 476 } 477 rcu_read_unlock(); 478 } 479 480 static void 481 resend(struct aoedev *d, struct frame *f) 482 { 483 struct sk_buff *skb; 484 struct sk_buff_head queue; 485 struct aoe_hdr *h; 486 struct aoetgt *t; 487 char buf[128]; 488 u32 n; 489 490 t = f->t; 491 n = newtag(d); 492 skb = f->skb; 493 if (ifrotate(t) == NULL) { 494 /* probably can't happen, but set it up to fail anyway */ 495 pr_info("aoe: resend: no interfaces to rotate to.\n"); 496 ktcomplete(f, NULL); 497 return; 498 } 499 h = (struct aoe_hdr *) skb_mac_header(skb); 500 501 if (!(f->flags & FFL_PROBE)) { 502 snprintf(buf, sizeof(buf), 503 "%15s e%ld.%d oldtag=%08x@%08lx newtag=%08x s=%pm d=%pm nout=%d\n", 504 "retransmit", d->aoemajor, d->aoeminor, 505 f->tag, jiffies, n, 506 h->src, h->dst, t->nout); 507 aoechr_error(buf); 508 } 509 510 f->tag = n; 511 fhash(f); 512 h->tag = cpu_to_be32(n); 513 memcpy(h->dst, t->addr, sizeof h->dst); 514 memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src); 515 516 skb->dev = t->ifp->nd; 517 skb = skb_clone(skb, GFP_ATOMIC); 518 if (skb == NULL) 519 return; 520 do_gettimeofday(&f->sent); 521 f->sent_jiffs = (u32) jiffies; 522 __skb_queue_head_init(&queue); 523 __skb_queue_tail(&queue, skb); 524 aoenet_xmit(&queue); 525 } 526 527 static int 528 tsince_hr(struct frame *f) 529 { 530 struct timeval now; 531 int n; 532 533 do_gettimeofday(&now); 534 n = now.tv_usec - f->sent.tv_usec; 535 n += (now.tv_sec - f->sent.tv_sec) * USEC_PER_SEC; 536 537 if (n < 0) 538 n = -n; 539 540 /* For relatively long periods, use jiffies to avoid 541 * discrepancies caused by updates to the system time. 542 * 543 * On system with HZ of 1000, 32-bits is over 49 days 544 * worth of jiffies, or over 71 minutes worth of usecs. 545 * 546 * Jiffies overflow is handled by subtraction of unsigned ints: 547 * (gdb) print (unsigned) 2 - (unsigned) 0xfffffffe 548 * $3 = 4 549 * (gdb) 550 */ 551 if (n > USEC_PER_SEC / 4) { 552 n = ((u32) jiffies) - f->sent_jiffs; 553 n *= USEC_PER_SEC / HZ; 554 } 555 556 return n; 557 } 558 559 static int 560 tsince(u32 tag) 561 { 562 int n; 563 564 n = jiffies & 0xffff; 565 n -= tag & 0xffff; 566 if (n < 0) 567 n += 1<<16; 568 return jiffies_to_usecs(n + 1); 569 } 570 571 static struct aoeif * 572 getif(struct aoetgt *t, struct net_device *nd) 573 { 574 struct aoeif *p, *e; 575 576 p = t->ifs; 577 e = p + NAOEIFS; 578 for (; p < e; p++) 579 if (p->nd == nd) 580 return p; 581 return NULL; 582 } 583 584 static void 585 ejectif(struct aoetgt *t, struct aoeif *ifp) 586 { 587 struct aoeif *e; 588 struct net_device *nd; 589 ulong n; 590 591 nd = ifp->nd; 592 e = t->ifs + NAOEIFS - 1; 593 n = (e - ifp) * sizeof *ifp; 594 memmove(ifp, ifp+1, n); 595 e->nd = NULL; 596 dev_put(nd); 597 } 598 599 static struct frame * 600 reassign_frame(struct frame *f) 601 { 602 struct frame *nf; 603 struct sk_buff *skb; 604 605 nf = newframe(f->t->d); 606 if (!nf) 607 return NULL; 608 if (nf->t == f->t) { 609 aoe_freetframe(nf); 610 return NULL; 611 } 612 613 skb = nf->skb; 614 nf->skb = f->skb; 615 nf->buf = f->buf; 616 nf->bcnt = f->bcnt; 617 nf->lba = f->lba; 618 nf->bv = f->bv; 619 nf->bv_off = f->bv_off; 620 nf->waited = 0; 621 nf->waited_total = f->waited_total; 622 nf->sent = f->sent; 623 nf->sent_jiffs = f->sent_jiffs; 624 f->skb = skb; 625 626 return nf; 627 } 628 629 static void 630 probe(struct aoetgt *t) 631 { 632 struct aoedev *d; 633 struct frame *f; 634 struct sk_buff *skb; 635 struct sk_buff_head queue; 636 size_t n, m; 637 int frag; 638 639 d = t->d; 640 f = newtframe(d, t); 641 if (!f) { 642 pr_err("%s %pm for e%ld.%d: %s\n", 643 "aoe: cannot probe remote address", 644 t->addr, 645 (long) d->aoemajor, d->aoeminor, 646 "no frame available"); 647 return; 648 } 649 f->flags |= FFL_PROBE; 650 ifrotate(t); 651 f->bcnt = t->d->maxbcnt ? t->d->maxbcnt : DEFAULTBCNT; 652 ata_rw_frameinit(f); 653 skb = f->skb; 654 for (frag = 0, n = f->bcnt; n > 0; ++frag, n -= m) { 655 if (n < PAGE_SIZE) 656 m = n; 657 else 658 m = PAGE_SIZE; 659 skb_fill_page_desc(skb, frag, empty_page, 0, m); 660 } 661 skb->len += f->bcnt; 662 skb->data_len = f->bcnt; 663 skb->truesize += f->bcnt; 664 665 skb = skb_clone(f->skb, GFP_ATOMIC); 666 if (skb) { 667 do_gettimeofday(&f->sent); 668 f->sent_jiffs = (u32) jiffies; 669 __skb_queue_head_init(&queue); 670 __skb_queue_tail(&queue, skb); 671 aoenet_xmit(&queue); 672 } 673 } 674 675 static long 676 rto(struct aoedev *d) 677 { 678 long t; 679 680 t = 2 * d->rttavg >> RTTSCALE; 681 t += 8 * d->rttdev >> RTTDSCALE; 682 if (t == 0) 683 t = 1; 684 685 return t; 686 } 687 688 static void 689 rexmit_deferred(struct aoedev *d) 690 { 691 struct aoetgt *t; 692 struct frame *f; 693 struct frame *nf; 694 struct list_head *pos, *nx, *head; 695 int since; 696 int untainted; 697 698 count_targets(d, &untainted); 699 700 head = &d->rexmitq; 701 list_for_each_safe(pos, nx, head) { 702 f = list_entry(pos, struct frame, head); 703 t = f->t; 704 if (t->taint) { 705 if (!(f->flags & FFL_PROBE)) { 706 nf = reassign_frame(f); 707 if (nf) { 708 if (t->nout_probes == 0 709 && untainted > 0) { 710 probe(t); 711 t->nout_probes++; 712 } 713 list_replace(&f->head, &nf->head); 714 pos = &nf->head; 715 aoe_freetframe(f); 716 f = nf; 717 t = f->t; 718 } 719 } else if (untainted < 1) { 720 /* don't probe w/o other untainted aoetgts */ 721 goto stop_probe; 722 } else if (tsince_hr(f) < t->taint * rto(d)) { 723 /* reprobe slowly when taint is high */ 724 continue; 725 } 726 } else if (f->flags & FFL_PROBE) { 727 stop_probe: /* don't probe untainted aoetgts */ 728 list_del(pos); 729 aoe_freetframe(f); 730 /* leaving d->kicked, because this is routine */ 731 f->t->d->flags |= DEVFL_KICKME; 732 continue; 733 } 734 if (t->nout >= t->maxout) 735 continue; 736 list_del(pos); 737 t->nout++; 738 if (f->flags & FFL_PROBE) 739 t->nout_probes++; 740 since = tsince_hr(f); 741 f->waited += since; 742 f->waited_total += since; 743 resend(d, f); 744 } 745 } 746 747 /* An aoetgt accumulates demerits quickly, and successful 748 * probing redeems the aoetgt slowly. 749 */ 750 static void 751 scorn(struct aoetgt *t) 752 { 753 int n; 754 755 n = t->taint++; 756 t->taint += t->taint * 2; 757 if (n > t->taint) 758 t->taint = n; 759 if (t->taint > MAX_TAINT) 760 t->taint = MAX_TAINT; 761 } 762 763 static int 764 count_targets(struct aoedev *d, int *untainted) 765 { 766 int i, good; 767 768 for (i = good = 0; i < d->ntargets && d->targets[i]; ++i) 769 if (d->targets[i]->taint == 0) 770 good++; 771 772 if (untainted) 773 *untainted = good; 774 return i; 775 } 776 777 static void 778 rexmit_timer(ulong vp) 779 { 780 struct aoedev *d; 781 struct aoetgt *t; 782 struct aoeif *ifp; 783 struct frame *f; 784 struct list_head *head, *pos, *nx; 785 LIST_HEAD(flist); 786 register long timeout; 787 ulong flags, n; 788 int i; 789 int utgts; /* number of aoetgt descriptors (not slots) */ 790 int since; 791 792 d = (struct aoedev *) vp; 793 794 spin_lock_irqsave(&d->lock, flags); 795 796 /* timeout based on observed timings and variations */ 797 timeout = rto(d); 798 799 utgts = count_targets(d, NULL); 800 801 if (d->flags & DEVFL_TKILL) { 802 spin_unlock_irqrestore(&d->lock, flags); 803 return; 804 } 805 806 /* collect all frames to rexmit into flist */ 807 for (i = 0; i < NFACTIVE; i++) { 808 head = &d->factive[i]; 809 list_for_each_safe(pos, nx, head) { 810 f = list_entry(pos, struct frame, head); 811 if (tsince_hr(f) < timeout) 812 break; /* end of expired frames */ 813 /* move to flist for later processing */ 814 list_move_tail(pos, &flist); 815 } 816 } 817 818 /* process expired frames */ 819 while (!list_empty(&flist)) { 820 pos = flist.next; 821 f = list_entry(pos, struct frame, head); 822 since = tsince_hr(f); 823 n = f->waited_total + since; 824 n /= USEC_PER_SEC; 825 if (aoe_deadsecs 826 && n > aoe_deadsecs 827 && !(f->flags & FFL_PROBE)) { 828 /* Waited too long. Device failure. 829 * Hang all frames on first hash bucket for downdev 830 * to clean up. 831 */ 832 list_splice(&flist, &d->factive[0]); 833 aoedev_downdev(d); 834 goto out; 835 } 836 837 t = f->t; 838 n = f->waited + since; 839 n /= USEC_PER_SEC; 840 if (aoe_deadsecs && utgts > 0 841 && (n > aoe_deadsecs / utgts || n > HARD_SCORN_SECS)) 842 scorn(t); /* avoid this target */ 843 844 if (t->maxout != 1) { 845 t->ssthresh = t->maxout / 2; 846 t->maxout = 1; 847 } 848 849 if (f->flags & FFL_PROBE) { 850 t->nout_probes--; 851 } else { 852 ifp = getif(t, f->skb->dev); 853 if (ifp && ++ifp->lost > (t->nframes << 1) 854 && (ifp != t->ifs || t->ifs[1].nd)) { 855 ejectif(t, ifp); 856 ifp = NULL; 857 } 858 } 859 list_move_tail(pos, &d->rexmitq); 860 t->nout--; 861 } 862 rexmit_deferred(d); 863 864 out: 865 if ((d->flags & DEVFL_KICKME) && d->blkq) { 866 d->flags &= ~DEVFL_KICKME; 867 d->blkq->request_fn(d->blkq); 868 } 869 870 d->timer.expires = jiffies + TIMERTICK; 871 add_timer(&d->timer); 872 873 spin_unlock_irqrestore(&d->lock, flags); 874 } 875 876 static unsigned long 877 rqbiocnt(struct request *r) 878 { 879 struct bio *bio; 880 unsigned long n = 0; 881 882 __rq_for_each_bio(bio, r) 883 n++; 884 return n; 885 } 886 887 /* This can be removed if we are certain that no users of the block 888 * layer will ever use zero-count pages in bios. Otherwise we have to 889 * protect against the put_page sometimes done by the network layer. 890 * 891 * See http://oss.sgi.com/archives/xfs/2007-01/msg00594.html for 892 * discussion. 893 * 894 * We cannot use get_page in the workaround, because it insists on a 895 * positive page count as a precondition. So we use _count directly. 896 */ 897 static void 898 bio_pageinc(struct bio *bio) 899 { 900 struct bio_vec *bv; 901 struct page *page; 902 int i; 903 904 bio_for_each_segment(bv, bio, i) { 905 /* Non-zero page count for non-head members of 906 * compound pages is no longer allowed by the kernel. 907 */ 908 page = compound_trans_head(bv->bv_page); 909 atomic_inc(&page->_count); 910 } 911 } 912 913 static void 914 bio_pagedec(struct bio *bio) 915 { 916 struct bio_vec *bv; 917 struct page *page; 918 int i; 919 920 bio_for_each_segment(bv, bio, i) { 921 page = compound_trans_head(bv->bv_page); 922 atomic_dec(&page->_count); 923 } 924 } 925 926 static void 927 bufinit(struct buf *buf, struct request *rq, struct bio *bio) 928 { 929 memset(buf, 0, sizeof(*buf)); 930 buf->rq = rq; 931 buf->bio = bio; 932 buf->resid = bio->bi_size; 933 buf->sector = bio->bi_sector; 934 bio_pageinc(bio); 935 buf->bv = bio_iovec(bio); 936 buf->bv_resid = buf->bv->bv_len; 937 WARN_ON(buf->bv_resid == 0); 938 } 939 940 static struct buf * 941 nextbuf(struct aoedev *d) 942 { 943 struct request *rq; 944 struct request_queue *q; 945 struct buf *buf; 946 struct bio *bio; 947 948 q = d->blkq; 949 if (q == NULL) 950 return NULL; /* initializing */ 951 if (d->ip.buf) 952 return d->ip.buf; 953 rq = d->ip.rq; 954 if (rq == NULL) { 955 rq = blk_peek_request(q); 956 if (rq == NULL) 957 return NULL; 958 blk_start_request(rq); 959 d->ip.rq = rq; 960 d->ip.nxbio = rq->bio; 961 rq->special = (void *) rqbiocnt(rq); 962 } 963 buf = mempool_alloc(d->bufpool, GFP_ATOMIC); 964 if (buf == NULL) { 965 pr_err("aoe: nextbuf: unable to mempool_alloc!\n"); 966 return NULL; 967 } 968 bio = d->ip.nxbio; 969 bufinit(buf, rq, bio); 970 bio = bio->bi_next; 971 d->ip.nxbio = bio; 972 if (bio == NULL) 973 d->ip.rq = NULL; 974 return d->ip.buf = buf; 975 } 976 977 /* enters with d->lock held */ 978 void 979 aoecmd_work(struct aoedev *d) 980 { 981 rexmit_deferred(d); 982 while (aoecmd_ata_rw(d)) 983 ; 984 } 985 986 /* this function performs work that has been deferred until sleeping is OK 987 */ 988 void 989 aoecmd_sleepwork(struct work_struct *work) 990 { 991 struct aoedev *d = container_of(work, struct aoedev, work); 992 struct block_device *bd; 993 u64 ssize; 994 995 if (d->flags & DEVFL_GDALLOC) 996 aoeblk_gdalloc(d); 997 998 if (d->flags & DEVFL_NEWSIZE) { 999 ssize = get_capacity(d->gd); 1000 bd = bdget_disk(d->gd, 0); 1001 if (bd) { 1002 mutex_lock(&bd->bd_inode->i_mutex); 1003 i_size_write(bd->bd_inode, (loff_t)ssize<<9); 1004 mutex_unlock(&bd->bd_inode->i_mutex); 1005 bdput(bd); 1006 } 1007 spin_lock_irq(&d->lock); 1008 d->flags |= DEVFL_UP; 1009 d->flags &= ~DEVFL_NEWSIZE; 1010 spin_unlock_irq(&d->lock); 1011 } 1012 } 1013 1014 static void 1015 ata_ident_fixstring(u16 *id, int ns) 1016 { 1017 u16 s; 1018 1019 while (ns-- > 0) { 1020 s = *id; 1021 *id++ = s >> 8 | s << 8; 1022 } 1023 } 1024 1025 static void 1026 ataid_complete(struct aoedev *d, struct aoetgt *t, unsigned char *id) 1027 { 1028 u64 ssize; 1029 u16 n; 1030 1031 /* word 83: command set supported */ 1032 n = get_unaligned_le16(&id[83 << 1]); 1033 1034 /* word 86: command set/feature enabled */ 1035 n |= get_unaligned_le16(&id[86 << 1]); 1036 1037 if (n & (1<<10)) { /* bit 10: LBA 48 */ 1038 d->flags |= DEVFL_EXT; 1039 1040 /* word 100: number lba48 sectors */ 1041 ssize = get_unaligned_le64(&id[100 << 1]); 1042 1043 /* set as in ide-disk.c:init_idedisk_capacity */ 1044 d->geo.cylinders = ssize; 1045 d->geo.cylinders /= (255 * 63); 1046 d->geo.heads = 255; 1047 d->geo.sectors = 63; 1048 } else { 1049 d->flags &= ~DEVFL_EXT; 1050 1051 /* number lba28 sectors */ 1052 ssize = get_unaligned_le32(&id[60 << 1]); 1053 1054 /* NOTE: obsolete in ATA 6 */ 1055 d->geo.cylinders = get_unaligned_le16(&id[54 << 1]); 1056 d->geo.heads = get_unaligned_le16(&id[55 << 1]); 1057 d->geo.sectors = get_unaligned_le16(&id[56 << 1]); 1058 } 1059 1060 ata_ident_fixstring((u16 *) &id[10<<1], 10); /* serial */ 1061 ata_ident_fixstring((u16 *) &id[23<<1], 4); /* firmware */ 1062 ata_ident_fixstring((u16 *) &id[27<<1], 20); /* model */ 1063 memcpy(d->ident, id, sizeof(d->ident)); 1064 1065 if (d->ssize != ssize) 1066 printk(KERN_INFO 1067 "aoe: %pm e%ld.%d v%04x has %llu sectors\n", 1068 t->addr, 1069 d->aoemajor, d->aoeminor, 1070 d->fw_ver, (long long)ssize); 1071 d->ssize = ssize; 1072 d->geo.start = 0; 1073 if (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE)) 1074 return; 1075 if (d->gd != NULL) { 1076 set_capacity(d->gd, ssize); 1077 d->flags |= DEVFL_NEWSIZE; 1078 } else 1079 d->flags |= DEVFL_GDALLOC; 1080 schedule_work(&d->work); 1081 } 1082 1083 static void 1084 calc_rttavg(struct aoedev *d, struct aoetgt *t, int rtt) 1085 { 1086 register long n; 1087 1088 n = rtt; 1089 1090 /* cf. Congestion Avoidance and Control, Jacobson & Karels, 1988 */ 1091 n -= d->rttavg >> RTTSCALE; 1092 d->rttavg += n; 1093 if (n < 0) 1094 n = -n; 1095 n -= d->rttdev >> RTTDSCALE; 1096 d->rttdev += n; 1097 1098 if (!t || t->maxout >= t->nframes) 1099 return; 1100 if (t->maxout < t->ssthresh) 1101 t->maxout += 1; 1102 else if (t->nout == t->maxout && t->next_cwnd-- == 0) { 1103 t->maxout += 1; 1104 t->next_cwnd = t->maxout; 1105 } 1106 } 1107 1108 static struct aoetgt * 1109 gettgt(struct aoedev *d, char *addr) 1110 { 1111 struct aoetgt **t, **e; 1112 1113 t = d->targets; 1114 e = t + d->ntargets; 1115 for (; t < e && *t; t++) 1116 if (memcmp((*t)->addr, addr, sizeof((*t)->addr)) == 0) 1117 return *t; 1118 return NULL; 1119 } 1120 1121 static void 1122 bvcpy(struct bio_vec *bv, ulong off, struct sk_buff *skb, long cnt) 1123 { 1124 ulong fcnt; 1125 char *p; 1126 int soff = 0; 1127 loop: 1128 fcnt = bv->bv_len - (off - bv->bv_offset); 1129 if (fcnt > cnt) 1130 fcnt = cnt; 1131 p = page_address(bv->bv_page) + off; 1132 skb_copy_bits(skb, soff, p, fcnt); 1133 soff += fcnt; 1134 cnt -= fcnt; 1135 if (cnt <= 0) 1136 return; 1137 bv++; 1138 off = bv->bv_offset; 1139 goto loop; 1140 } 1141 1142 void 1143 aoe_end_request(struct aoedev *d, struct request *rq, int fastfail) 1144 { 1145 struct bio *bio; 1146 int bok; 1147 struct request_queue *q; 1148 1149 q = d->blkq; 1150 if (rq == d->ip.rq) 1151 d->ip.rq = NULL; 1152 do { 1153 bio = rq->bio; 1154 bok = !fastfail && test_bit(BIO_UPTODATE, &bio->bi_flags); 1155 } while (__blk_end_request(rq, bok ? 0 : -EIO, bio->bi_size)); 1156 1157 /* cf. http://lkml.org/lkml/2006/10/31/28 */ 1158 if (!fastfail) 1159 __blk_run_queue(q); 1160 } 1161 1162 static void 1163 aoe_end_buf(struct aoedev *d, struct buf *buf) 1164 { 1165 struct request *rq; 1166 unsigned long n; 1167 1168 if (buf == d->ip.buf) 1169 d->ip.buf = NULL; 1170 rq = buf->rq; 1171 bio_pagedec(buf->bio); 1172 mempool_free(buf, d->bufpool); 1173 n = (unsigned long) rq->special; 1174 rq->special = (void *) --n; 1175 if (n == 0) 1176 aoe_end_request(d, rq, 0); 1177 } 1178 1179 static void 1180 ktiocomplete(struct frame *f) 1181 { 1182 struct aoe_hdr *hin, *hout; 1183 struct aoe_atahdr *ahin, *ahout; 1184 struct buf *buf; 1185 struct sk_buff *skb; 1186 struct aoetgt *t; 1187 struct aoeif *ifp; 1188 struct aoedev *d; 1189 long n; 1190 int untainted; 1191 1192 if (f == NULL) 1193 return; 1194 1195 t = f->t; 1196 d = t->d; 1197 skb = f->r_skb; 1198 buf = f->buf; 1199 if (f->flags & FFL_PROBE) 1200 goto out; 1201 if (!skb) /* just fail the buf. */ 1202 goto noskb; 1203 1204 hout = (struct aoe_hdr *) skb_mac_header(f->skb); 1205 ahout = (struct aoe_atahdr *) (hout+1); 1206 1207 hin = (struct aoe_hdr *) skb->data; 1208 skb_pull(skb, sizeof(*hin)); 1209 ahin = (struct aoe_atahdr *) skb->data; 1210 skb_pull(skb, sizeof(*ahin)); 1211 if (ahin->cmdstat & 0xa9) { /* these bits cleared on success */ 1212 pr_err("aoe: ata error cmd=%2.2Xh stat=%2.2Xh from e%ld.%d\n", 1213 ahout->cmdstat, ahin->cmdstat, 1214 d->aoemajor, d->aoeminor); 1215 noskb: if (buf) 1216 clear_bit(BIO_UPTODATE, &buf->bio->bi_flags); 1217 goto out; 1218 } 1219 1220 n = ahout->scnt << 9; 1221 switch (ahout->cmdstat) { 1222 case ATA_CMD_PIO_READ: 1223 case ATA_CMD_PIO_READ_EXT: 1224 if (skb->len < n) { 1225 pr_err("%s e%ld.%d. skb->len=%d need=%ld\n", 1226 "aoe: runt data size in read from", 1227 (long) d->aoemajor, d->aoeminor, 1228 skb->len, n); 1229 clear_bit(BIO_UPTODATE, &buf->bio->bi_flags); 1230 break; 1231 } 1232 bvcpy(f->bv, f->bv_off, skb, n); 1233 case ATA_CMD_PIO_WRITE: 1234 case ATA_CMD_PIO_WRITE_EXT: 1235 spin_lock_irq(&d->lock); 1236 ifp = getif(t, skb->dev); 1237 if (ifp) 1238 ifp->lost = 0; 1239 spin_unlock_irq(&d->lock); 1240 break; 1241 case ATA_CMD_ID_ATA: 1242 if (skb->len < 512) { 1243 pr_info("%s e%ld.%d. skb->len=%d need=512\n", 1244 "aoe: runt data size in ataid from", 1245 (long) d->aoemajor, d->aoeminor, 1246 skb->len); 1247 break; 1248 } 1249 if (skb_linearize(skb)) 1250 break; 1251 spin_lock_irq(&d->lock); 1252 ataid_complete(d, t, skb->data); 1253 spin_unlock_irq(&d->lock); 1254 break; 1255 default: 1256 pr_info("aoe: unrecognized ata command %2.2Xh for %d.%d\n", 1257 ahout->cmdstat, 1258 be16_to_cpu(get_unaligned(&hin->major)), 1259 hin->minor); 1260 } 1261 out: 1262 spin_lock_irq(&d->lock); 1263 if (t->taint > 0 1264 && --t->taint > 0 1265 && t->nout_probes == 0) { 1266 count_targets(d, &untainted); 1267 if (untainted > 0) { 1268 probe(t); 1269 t->nout_probes++; 1270 } 1271 } 1272 1273 aoe_freetframe(f); 1274 1275 if (buf && --buf->nframesout == 0 && buf->resid == 0) 1276 aoe_end_buf(d, buf); 1277 1278 spin_unlock_irq(&d->lock); 1279 aoedev_put(d); 1280 dev_kfree_skb(skb); 1281 } 1282 1283 /* Enters with iocq.lock held. 1284 * Returns true iff responses needing processing remain. 1285 */ 1286 static int 1287 ktio(int id) 1288 { 1289 struct frame *f; 1290 struct list_head *pos; 1291 int i; 1292 int actual_id; 1293 1294 for (i = 0; ; ++i) { 1295 if (i == MAXIOC) 1296 return 1; 1297 if (list_empty(&iocq[id].head)) 1298 return 0; 1299 pos = iocq[id].head.next; 1300 list_del(pos); 1301 f = list_entry(pos, struct frame, head); 1302 spin_unlock_irq(&iocq[id].lock); 1303 ktiocomplete(f); 1304 1305 /* Figure out if extra threads are required. */ 1306 actual_id = f->t->d->aoeminor % ncpus; 1307 1308 if (!kts[actual_id].active) { 1309 BUG_ON(id != 0); 1310 mutex_lock(&ktio_spawn_lock); 1311 if (!kts[actual_id].active 1312 && aoe_ktstart(&kts[actual_id]) == 0) 1313 kts[actual_id].active = 1; 1314 mutex_unlock(&ktio_spawn_lock); 1315 } 1316 spin_lock_irq(&iocq[id].lock); 1317 } 1318 } 1319 1320 static int 1321 kthread(void *vp) 1322 { 1323 struct ktstate *k; 1324 DECLARE_WAITQUEUE(wait, current); 1325 int more; 1326 1327 k = vp; 1328 current->flags |= PF_NOFREEZE; 1329 set_user_nice(current, -10); 1330 complete(&k->rendez); /* tell spawner we're running */ 1331 do { 1332 spin_lock_irq(k->lock); 1333 more = k->fn(k->id); 1334 if (!more) { 1335 add_wait_queue(k->waitq, &wait); 1336 __set_current_state(TASK_INTERRUPTIBLE); 1337 } 1338 spin_unlock_irq(k->lock); 1339 if (!more) { 1340 schedule(); 1341 remove_wait_queue(k->waitq, &wait); 1342 } else 1343 cond_resched(); 1344 } while (!kthread_should_stop()); 1345 complete(&k->rendez); /* tell spawner we're stopping */ 1346 return 0; 1347 } 1348 1349 void 1350 aoe_ktstop(struct ktstate *k) 1351 { 1352 kthread_stop(k->task); 1353 wait_for_completion(&k->rendez); 1354 } 1355 1356 int 1357 aoe_ktstart(struct ktstate *k) 1358 { 1359 struct task_struct *task; 1360 1361 init_completion(&k->rendez); 1362 task = kthread_run(kthread, k, "%s", k->name); 1363 if (task == NULL || IS_ERR(task)) 1364 return -ENOMEM; 1365 k->task = task; 1366 wait_for_completion(&k->rendez); /* allow kthread to start */ 1367 init_completion(&k->rendez); /* for waiting for exit later */ 1368 return 0; 1369 } 1370 1371 /* pass it off to kthreads for processing */ 1372 static void 1373 ktcomplete(struct frame *f, struct sk_buff *skb) 1374 { 1375 int id; 1376 ulong flags; 1377 1378 f->r_skb = skb; 1379 id = f->t->d->aoeminor % ncpus; 1380 spin_lock_irqsave(&iocq[id].lock, flags); 1381 if (!kts[id].active) { 1382 spin_unlock_irqrestore(&iocq[id].lock, flags); 1383 /* The thread with id has not been spawned yet, 1384 * so delegate the work to the main thread and 1385 * try spawning a new thread. 1386 */ 1387 id = 0; 1388 spin_lock_irqsave(&iocq[id].lock, flags); 1389 } 1390 list_add_tail(&f->head, &iocq[id].head); 1391 spin_unlock_irqrestore(&iocq[id].lock, flags); 1392 wake_up(&ktiowq[id]); 1393 } 1394 1395 struct sk_buff * 1396 aoecmd_ata_rsp(struct sk_buff *skb) 1397 { 1398 struct aoedev *d; 1399 struct aoe_hdr *h; 1400 struct frame *f; 1401 u32 n; 1402 ulong flags; 1403 char ebuf[128]; 1404 u16 aoemajor; 1405 1406 h = (struct aoe_hdr *) skb->data; 1407 aoemajor = be16_to_cpu(get_unaligned(&h->major)); 1408 d = aoedev_by_aoeaddr(aoemajor, h->minor, 0); 1409 if (d == NULL) { 1410 snprintf(ebuf, sizeof ebuf, "aoecmd_ata_rsp: ata response " 1411 "for unknown device %d.%d\n", 1412 aoemajor, h->minor); 1413 aoechr_error(ebuf); 1414 return skb; 1415 } 1416 1417 spin_lock_irqsave(&d->lock, flags); 1418 1419 n = be32_to_cpu(get_unaligned(&h->tag)); 1420 f = getframe(d, n); 1421 if (f) { 1422 calc_rttavg(d, f->t, tsince_hr(f)); 1423 f->t->nout--; 1424 if (f->flags & FFL_PROBE) 1425 f->t->nout_probes--; 1426 } else { 1427 f = getframe_deferred(d, n); 1428 if (f) { 1429 calc_rttavg(d, NULL, tsince_hr(f)); 1430 } else { 1431 calc_rttavg(d, NULL, tsince(n)); 1432 spin_unlock_irqrestore(&d->lock, flags); 1433 aoedev_put(d); 1434 snprintf(ebuf, sizeof(ebuf), 1435 "%15s e%d.%d tag=%08x@%08lx s=%pm d=%pm\n", 1436 "unexpected rsp", 1437 get_unaligned_be16(&h->major), 1438 h->minor, 1439 get_unaligned_be32(&h->tag), 1440 jiffies, 1441 h->src, 1442 h->dst); 1443 aoechr_error(ebuf); 1444 return skb; 1445 } 1446 } 1447 aoecmd_work(d); 1448 1449 spin_unlock_irqrestore(&d->lock, flags); 1450 1451 ktcomplete(f, skb); 1452 1453 /* 1454 * Note here that we do not perform an aoedev_put, as we are 1455 * leaving this reference for the ktio to release. 1456 */ 1457 return NULL; 1458 } 1459 1460 void 1461 aoecmd_cfg(ushort aoemajor, unsigned char aoeminor) 1462 { 1463 struct sk_buff_head queue; 1464 1465 __skb_queue_head_init(&queue); 1466 aoecmd_cfg_pkts(aoemajor, aoeminor, &queue); 1467 aoenet_xmit(&queue); 1468 } 1469 1470 struct sk_buff * 1471 aoecmd_ata_id(struct aoedev *d) 1472 { 1473 struct aoe_hdr *h; 1474 struct aoe_atahdr *ah; 1475 struct frame *f; 1476 struct sk_buff *skb; 1477 struct aoetgt *t; 1478 1479 f = newframe(d); 1480 if (f == NULL) 1481 return NULL; 1482 1483 t = *d->tgt; 1484 1485 /* initialize the headers & frame */ 1486 skb = f->skb; 1487 h = (struct aoe_hdr *) skb_mac_header(skb); 1488 ah = (struct aoe_atahdr *) (h+1); 1489 skb_put(skb, sizeof *h + sizeof *ah); 1490 memset(h, 0, skb->len); 1491 f->tag = aoehdr_atainit(d, t, h); 1492 fhash(f); 1493 t->nout++; 1494 f->waited = 0; 1495 f->waited_total = 0; 1496 1497 /* set up ata header */ 1498 ah->scnt = 1; 1499 ah->cmdstat = ATA_CMD_ID_ATA; 1500 ah->lba3 = 0xa0; 1501 1502 skb->dev = t->ifp->nd; 1503 1504 d->rttavg = RTTAVG_INIT; 1505 d->rttdev = RTTDEV_INIT; 1506 d->timer.function = rexmit_timer; 1507 1508 skb = skb_clone(skb, GFP_ATOMIC); 1509 if (skb) { 1510 do_gettimeofday(&f->sent); 1511 f->sent_jiffs = (u32) jiffies; 1512 } 1513 1514 return skb; 1515 } 1516 1517 static struct aoetgt ** 1518 grow_targets(struct aoedev *d) 1519 { 1520 ulong oldn, newn; 1521 struct aoetgt **tt; 1522 1523 oldn = d->ntargets; 1524 newn = oldn * 2; 1525 tt = kcalloc(newn, sizeof(*d->targets), GFP_ATOMIC); 1526 if (!tt) 1527 return NULL; 1528 memmove(tt, d->targets, sizeof(*d->targets) * oldn); 1529 d->tgt = tt + (d->tgt - d->targets); 1530 kfree(d->targets); 1531 d->targets = tt; 1532 d->ntargets = newn; 1533 1534 return &d->targets[oldn]; 1535 } 1536 1537 static struct aoetgt * 1538 addtgt(struct aoedev *d, char *addr, ulong nframes) 1539 { 1540 struct aoetgt *t, **tt, **te; 1541 1542 tt = d->targets; 1543 te = tt + d->ntargets; 1544 for (; tt < te && *tt; tt++) 1545 ; 1546 1547 if (tt == te) { 1548 tt = grow_targets(d); 1549 if (!tt) 1550 goto nomem; 1551 } 1552 t = kzalloc(sizeof(*t), GFP_ATOMIC); 1553 if (!t) 1554 goto nomem; 1555 t->nframes = nframes; 1556 t->d = d; 1557 memcpy(t->addr, addr, sizeof t->addr); 1558 t->ifp = t->ifs; 1559 aoecmd_wreset(t); 1560 t->maxout = t->nframes / 2; 1561 INIT_LIST_HEAD(&t->ffree); 1562 return *tt = t; 1563 1564 nomem: 1565 pr_info("aoe: cannot allocate memory to add target\n"); 1566 return NULL; 1567 } 1568 1569 static void 1570 setdbcnt(struct aoedev *d) 1571 { 1572 struct aoetgt **t, **e; 1573 int bcnt = 0; 1574 1575 t = d->targets; 1576 e = t + d->ntargets; 1577 for (; t < e && *t; t++) 1578 if (bcnt == 0 || bcnt > (*t)->minbcnt) 1579 bcnt = (*t)->minbcnt; 1580 if (bcnt != d->maxbcnt) { 1581 d->maxbcnt = bcnt; 1582 pr_info("aoe: e%ld.%d: setting %d byte data frames\n", 1583 d->aoemajor, d->aoeminor, bcnt); 1584 } 1585 } 1586 1587 static void 1588 setifbcnt(struct aoetgt *t, struct net_device *nd, int bcnt) 1589 { 1590 struct aoedev *d; 1591 struct aoeif *p, *e; 1592 int minbcnt; 1593 1594 d = t->d; 1595 minbcnt = bcnt; 1596 p = t->ifs; 1597 e = p + NAOEIFS; 1598 for (; p < e; p++) { 1599 if (p->nd == NULL) 1600 break; /* end of the valid interfaces */ 1601 if (p->nd == nd) { 1602 p->bcnt = bcnt; /* we're updating */ 1603 nd = NULL; 1604 } else if (minbcnt > p->bcnt) 1605 minbcnt = p->bcnt; /* find the min interface */ 1606 } 1607 if (nd) { 1608 if (p == e) { 1609 pr_err("aoe: device setifbcnt failure; too many interfaces.\n"); 1610 return; 1611 } 1612 dev_hold(nd); 1613 p->nd = nd; 1614 p->bcnt = bcnt; 1615 } 1616 t->minbcnt = minbcnt; 1617 setdbcnt(d); 1618 } 1619 1620 void 1621 aoecmd_cfg_rsp(struct sk_buff *skb) 1622 { 1623 struct aoedev *d; 1624 struct aoe_hdr *h; 1625 struct aoe_cfghdr *ch; 1626 struct aoetgt *t; 1627 ulong flags, aoemajor; 1628 struct sk_buff *sl; 1629 struct sk_buff_head queue; 1630 u16 n; 1631 1632 sl = NULL; 1633 h = (struct aoe_hdr *) skb_mac_header(skb); 1634 ch = (struct aoe_cfghdr *) (h+1); 1635 1636 /* 1637 * Enough people have their dip switches set backwards to 1638 * warrant a loud message for this special case. 1639 */ 1640 aoemajor = get_unaligned_be16(&h->major); 1641 if (aoemajor == 0xfff) { 1642 printk(KERN_ERR "aoe: Warning: shelf address is all ones. " 1643 "Check shelf dip switches.\n"); 1644 return; 1645 } 1646 if (aoemajor == 0xffff) { 1647 pr_info("aoe: e%ld.%d: broadcast shelf number invalid\n", 1648 aoemajor, (int) h->minor); 1649 return; 1650 } 1651 if (h->minor == 0xff) { 1652 pr_info("aoe: e%ld.%d: broadcast slot number invalid\n", 1653 aoemajor, (int) h->minor); 1654 return; 1655 } 1656 1657 n = be16_to_cpu(ch->bufcnt); 1658 if (n > aoe_maxout) /* keep it reasonable */ 1659 n = aoe_maxout; 1660 1661 d = aoedev_by_aoeaddr(aoemajor, h->minor, 1); 1662 if (d == NULL) { 1663 pr_info("aoe: device allocation failure\n"); 1664 return; 1665 } 1666 1667 spin_lock_irqsave(&d->lock, flags); 1668 1669 t = gettgt(d, h->src); 1670 if (t) { 1671 t->nframes = n; 1672 if (n < t->maxout) 1673 aoecmd_wreset(t); 1674 } else { 1675 t = addtgt(d, h->src, n); 1676 if (!t) 1677 goto bail; 1678 } 1679 n = skb->dev->mtu; 1680 n -= sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr); 1681 n /= 512; 1682 if (n > ch->scnt) 1683 n = ch->scnt; 1684 n = n ? n * 512 : DEFAULTBCNT; 1685 setifbcnt(t, skb->dev, n); 1686 1687 /* don't change users' perspective */ 1688 if (d->nopen == 0) { 1689 d->fw_ver = be16_to_cpu(ch->fwver); 1690 sl = aoecmd_ata_id(d); 1691 } 1692 bail: 1693 spin_unlock_irqrestore(&d->lock, flags); 1694 aoedev_put(d); 1695 if (sl) { 1696 __skb_queue_head_init(&queue); 1697 __skb_queue_tail(&queue, sl); 1698 aoenet_xmit(&queue); 1699 } 1700 } 1701 1702 void 1703 aoecmd_wreset(struct aoetgt *t) 1704 { 1705 t->maxout = 1; 1706 t->ssthresh = t->nframes / 2; 1707 t->next_cwnd = t->nframes; 1708 } 1709 1710 void 1711 aoecmd_cleanslate(struct aoedev *d) 1712 { 1713 struct aoetgt **t, **te; 1714 1715 d->rttavg = RTTAVG_INIT; 1716 d->rttdev = RTTDEV_INIT; 1717 d->maxbcnt = 0; 1718 1719 t = d->targets; 1720 te = t + d->ntargets; 1721 for (; t < te && *t; t++) 1722 aoecmd_wreset(*t); 1723 } 1724 1725 void 1726 aoe_failbuf(struct aoedev *d, struct buf *buf) 1727 { 1728 if (buf == NULL) 1729 return; 1730 buf->resid = 0; 1731 clear_bit(BIO_UPTODATE, &buf->bio->bi_flags); 1732 if (buf->nframesout == 0) 1733 aoe_end_buf(d, buf); 1734 } 1735 1736 void 1737 aoe_flush_iocq(void) 1738 { 1739 int i; 1740 1741 for (i = 0; i < ncpus; i++) { 1742 if (kts[i].active) 1743 aoe_flush_iocq_by_index(i); 1744 } 1745 } 1746 1747 void 1748 aoe_flush_iocq_by_index(int id) 1749 { 1750 struct frame *f; 1751 struct aoedev *d; 1752 LIST_HEAD(flist); 1753 struct list_head *pos; 1754 struct sk_buff *skb; 1755 ulong flags; 1756 1757 spin_lock_irqsave(&iocq[id].lock, flags); 1758 list_splice_init(&iocq[id].head, &flist); 1759 spin_unlock_irqrestore(&iocq[id].lock, flags); 1760 while (!list_empty(&flist)) { 1761 pos = flist.next; 1762 list_del(pos); 1763 f = list_entry(pos, struct frame, head); 1764 d = f->t->d; 1765 skb = f->r_skb; 1766 spin_lock_irqsave(&d->lock, flags); 1767 if (f->buf) { 1768 f->buf->nframesout--; 1769 aoe_failbuf(d, f->buf); 1770 } 1771 aoe_freetframe(f); 1772 spin_unlock_irqrestore(&d->lock, flags); 1773 dev_kfree_skb(skb); 1774 aoedev_put(d); 1775 } 1776 } 1777 1778 int __init 1779 aoecmd_init(void) 1780 { 1781 void *p; 1782 int i; 1783 int ret; 1784 1785 /* get_zeroed_page returns page with ref count 1 */ 1786 p = (void *) get_zeroed_page(GFP_KERNEL | __GFP_REPEAT); 1787 if (!p) 1788 return -ENOMEM; 1789 empty_page = virt_to_page(p); 1790 1791 ncpus = num_online_cpus(); 1792 1793 iocq = kcalloc(ncpus, sizeof(struct iocq_ktio), GFP_KERNEL); 1794 if (!iocq) 1795 return -ENOMEM; 1796 1797 kts = kcalloc(ncpus, sizeof(struct ktstate), GFP_KERNEL); 1798 if (!kts) { 1799 ret = -ENOMEM; 1800 goto kts_fail; 1801 } 1802 1803 ktiowq = kcalloc(ncpus, sizeof(wait_queue_head_t), GFP_KERNEL); 1804 if (!ktiowq) { 1805 ret = -ENOMEM; 1806 goto ktiowq_fail; 1807 } 1808 1809 mutex_init(&ktio_spawn_lock); 1810 1811 for (i = 0; i < ncpus; i++) { 1812 INIT_LIST_HEAD(&iocq[i].head); 1813 spin_lock_init(&iocq[i].lock); 1814 init_waitqueue_head(&ktiowq[i]); 1815 snprintf(kts[i].name, sizeof(kts[i].name), "aoe_ktio%d", i); 1816 kts[i].fn = ktio; 1817 kts[i].waitq = &ktiowq[i]; 1818 kts[i].lock = &iocq[i].lock; 1819 kts[i].id = i; 1820 kts[i].active = 0; 1821 } 1822 kts[0].active = 1; 1823 if (aoe_ktstart(&kts[0])) { 1824 ret = -ENOMEM; 1825 goto ktstart_fail; 1826 } 1827 return 0; 1828 1829 ktstart_fail: 1830 kfree(ktiowq); 1831 ktiowq_fail: 1832 kfree(kts); 1833 kts_fail: 1834 kfree(iocq); 1835 1836 return ret; 1837 } 1838 1839 void 1840 aoecmd_exit(void) 1841 { 1842 int i; 1843 1844 for (i = 0; i < ncpus; i++) 1845 if (kts[i].active) 1846 aoe_ktstop(&kts[i]); 1847 1848 aoe_flush_iocq(); 1849 1850 /* Free up the iocq and thread speicific configuration 1851 * allocated during startup. 1852 */ 1853 kfree(iocq); 1854 kfree(kts); 1855 kfree(ktiowq); 1856 1857 free_page((unsigned long) page_address(empty_page)); 1858 empty_page = NULL; 1859 } 1860