1/* Copyright (c) 2013 Coraid, Inc. See COPYING for GPL terms. */ 2/* 3 * aoecmd.c 4 * Filesystem request handling methods 5 */ 6 7#include <linux/ata.h> 8#include <linux/slab.h> 9#include <linux/hdreg.h> 10#include <linux/blk-mq.h> 11#include <linux/skbuff.h> 12#include <linux/netdevice.h> 13#include <linux/genhd.h> 14#include <linux/moduleparam.h> 15#include <linux/workqueue.h> 16#include <linux/kthread.h> 17#include <net/net_namespace.h> 18#include <asm/unaligned.h> 19#include <linux/uio.h> 20#include "aoe.h" 21 22#define MAXIOC (8192) /* default meant to avoid most soft lockups */ 23 24static void ktcomplete(struct frame *, struct sk_buff *); 25static int count_targets(struct aoedev *d, int *untainted); 26 27static struct buf *nextbuf(struct aoedev *); 28 29static int aoe_deadsecs = 60 * 3; 30module_param(aoe_deadsecs, int, 0644); 31MODULE_PARM_DESC(aoe_deadsecs, "After aoe_deadsecs seconds, give up and fail dev."); 32 33static int aoe_maxout = 64; 34module_param(aoe_maxout, int, 0644); 35MODULE_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 */ 45static int ncpus; 46 47/* mutex lock used for synchronization while thread spawning */ 48static DEFINE_MUTEX(ktio_spawn_lock); 49 50static wait_queue_head_t *ktiowq; 51static struct ktstate *kts; 52 53/* io completion queue */ 54struct iocq_ktio { 55 struct list_head head; 56 spinlock_t lock; 57}; 58static struct iocq_ktio *iocq; 59 60static struct page *empty_page; 61 62static struct sk_buff * 63new_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 78static struct frame * 79getframe_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 95static struct frame * 96getframe(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 */ 119static int 120newtag(struct aoedev *d) 121{ 122 register ulong n; 123 124 n = jiffies & 0xffff; 125 return n |= (++d->lasttag & 0x7fff) << 16; 126} 127 128static u32 129aoehdr_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 145static inline void 146put_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 156static struct aoeif * 157ifrotate(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 170static void 171skb_pool_put(struct aoedev *d, struct sk_buff *skb) 172{ 173 __skb_queue_tail(&d->skbpool, skb); 174} 175 176static struct sk_buff * 177skb_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 192void 193aoe_freetframe(struct frame *f) 194{ 195 struct aoetgt *t; 196 197 t = f->t; 198 f->buf = NULL; 199 memset(&f->iter, 0, sizeof(f->iter)); 200 f->r_skb = NULL; 201 f->flags = 0; 202 list_add(&f->head, &t->ffree); 203} 204 205static struct frame * 206newtframe(struct aoedev *d, struct aoetgt *t) 207{ 208 struct frame *f; 209 struct sk_buff *skb; 210 struct list_head *pos; 211 212 if (list_empty(&t->ffree)) { 213 if (t->falloc >= NSKBPOOLMAX*2) 214 return NULL; 215 f = kcalloc(1, sizeof(*f), GFP_ATOMIC); 216 if (f == NULL) 217 return NULL; 218 t->falloc++; 219 f->t = t; 220 } else { 221 pos = t->ffree.next; 222 list_del(pos); 223 f = list_entry(pos, struct frame, head); 224 } 225 226 skb = f->skb; 227 if (skb == NULL) { 228 f->skb = skb = new_skb(ETH_ZLEN); 229 if (!skb) { 230bail: aoe_freetframe(f); 231 return NULL; 232 } 233 } 234 235 if (atomic_read(&skb_shinfo(skb)->dataref) != 1) { 236 skb = skb_pool_get(d); 237 if (skb == NULL) 238 goto bail; 239 skb_pool_put(d, f->skb); 240 f->skb = skb; 241 } 242 243 skb->truesize -= skb->data_len; 244 skb_shinfo(skb)->nr_frags = skb->data_len = 0; 245 skb_trim(skb, 0); 246 return f; 247} 248 249static struct frame * 250newframe(struct aoedev *d) 251{ 252 struct frame *f; 253 struct aoetgt *t, **tt; 254 int totout = 0; 255 int use_tainted; 256 int has_untainted; 257 258 if (!d->targets || !d->targets[0]) { 259 printk(KERN_ERR "aoe: NULL TARGETS!\n"); 260 return NULL; 261 } 262 tt = d->tgt; /* last used target */ 263 for (use_tainted = 0, has_untainted = 0;;) { 264 tt++; 265 if (tt >= &d->targets[d->ntargets] || !*tt) 266 tt = d->targets; 267 t = *tt; 268 if (!t->taint) { 269 has_untainted = 1; 270 totout += t->nout; 271 } 272 if (t->nout < t->maxout 273 && (use_tainted || !t->taint) 274 && t->ifp->nd) { 275 f = newtframe(d, t); 276 if (f) { 277 ifrotate(t); 278 d->tgt = tt; 279 return f; 280 } 281 } 282 if (tt == d->tgt) { /* we've looped and found nada */ 283 if (!use_tainted && !has_untainted) 284 use_tainted = 1; 285 else 286 break; 287 } 288 } 289 if (totout == 0) { 290 d->kicked++; 291 d->flags |= DEVFL_KICKME; 292 } 293 return NULL; 294} 295 296static void 297skb_fillup(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter) 298{ 299 int frag = 0; 300 struct bio_vec bv; 301 302 __bio_for_each_segment(bv, bio, iter, iter) 303 skb_fill_page_desc(skb, frag++, bv.bv_page, 304 bv.bv_offset, bv.bv_len); 305} 306 307static void 308fhash(struct frame *f) 309{ 310 struct aoedev *d = f->t->d; 311 u32 n; 312 313 n = f->tag % NFACTIVE; 314 list_add_tail(&f->head, &d->factive[n]); 315} 316 317static void 318ata_rw_frameinit(struct frame *f) 319{ 320 struct aoetgt *t; 321 struct aoe_hdr *h; 322 struct aoe_atahdr *ah; 323 struct sk_buff *skb; 324 char writebit, extbit; 325 326 skb = f->skb; 327 h = (struct aoe_hdr *) skb_mac_header(skb); 328 ah = (struct aoe_atahdr *) (h + 1); 329 skb_put(skb, sizeof(*h) + sizeof(*ah)); 330 memset(h, 0, skb->len); 331 332 writebit = 0x10; 333 extbit = 0x4; 334 335 t = f->t; 336 f->tag = aoehdr_atainit(t->d, t, h); 337 fhash(f); 338 t->nout++; 339 f->waited = 0; 340 f->waited_total = 0; 341 342 /* set up ata header */ 343 ah->scnt = f->iter.bi_size >> 9; 344 put_lba(ah, f->iter.bi_sector); 345 if (t->d->flags & DEVFL_EXT) { 346 ah->aflags |= AOEAFL_EXT; 347 } else { 348 extbit = 0; 349 ah->lba3 &= 0x0f; 350 ah->lba3 |= 0xe0; /* LBA bit + obsolete 0xa0 */ 351 } 352 if (f->buf && bio_data_dir(f->buf->bio) == WRITE) { 353 skb_fillup(skb, f->buf->bio, f->iter); 354 ah->aflags |= AOEAFL_WRITE; 355 skb->len += f->iter.bi_size; 356 skb->data_len = f->iter.bi_size; 357 skb->truesize += f->iter.bi_size; 358 t->wpkts++; 359 } else { 360 t->rpkts++; 361 writebit = 0; 362 } 363 364 ah->cmdstat = ATA_CMD_PIO_READ | writebit | extbit; 365 skb->dev = t->ifp->nd; 366} 367 368static int 369aoecmd_ata_rw(struct aoedev *d) 370{ 371 struct frame *f; 372 struct buf *buf; 373 struct sk_buff *skb; 374 struct sk_buff_head queue; 375 376 buf = nextbuf(d); 377 if (buf == NULL) 378 return 0; 379 f = newframe(d); 380 if (f == NULL) 381 return 0; 382 383 /* initialize the headers & frame */ 384 f->buf = buf; 385 f->iter = buf->iter; 386 f->iter.bi_size = min_t(unsigned long, 387 d->maxbcnt ?: DEFAULTBCNT, 388 f->iter.bi_size); 389 bio_advance_iter(buf->bio, &buf->iter, f->iter.bi_size); 390 391 if (!buf->iter.bi_size) 392 d->ip.buf = NULL; 393 394 /* mark all tracking fields and load out */ 395 buf->nframesout += 1; 396 397 ata_rw_frameinit(f); 398 399 skb = skb_clone(f->skb, GFP_ATOMIC); 400 if (skb) { 401 f->sent = ktime_get(); 402 __skb_queue_head_init(&queue); 403 __skb_queue_tail(&queue, skb); 404 aoenet_xmit(&queue); 405 } 406 return 1; 407} 408 409/* some callers cannot sleep, and they can call this function, 410 * transmitting the packets later, when interrupts are on 411 */ 412static void 413aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff_head *queue) 414{ 415 struct aoe_hdr *h; 416 struct aoe_cfghdr *ch; 417 struct sk_buff *skb; 418 struct net_device *ifp; 419 420 rcu_read_lock(); 421 for_each_netdev_rcu(&init_net, ifp) { 422 dev_hold(ifp); 423 if (!is_aoe_netif(ifp)) 424 goto cont; 425 426 skb = new_skb(sizeof *h + sizeof *ch); 427 if (skb == NULL) { 428 printk(KERN_INFO "aoe: skb alloc failure\n"); 429 goto cont; 430 } 431 skb_put(skb, sizeof *h + sizeof *ch); 432 skb->dev = ifp; 433 __skb_queue_tail(queue, skb); 434 h = (struct aoe_hdr *) skb_mac_header(skb); 435 memset(h, 0, sizeof *h + sizeof *ch); 436 437 memset(h->dst, 0xff, sizeof h->dst); 438 memcpy(h->src, ifp->dev_addr, sizeof h->src); 439 h->type = __constant_cpu_to_be16(ETH_P_AOE); 440 h->verfl = AOE_HVER; 441 h->major = cpu_to_be16(aoemajor); 442 h->minor = aoeminor; 443 h->cmd = AOECMD_CFG; 444 445cont: 446 dev_put(ifp); 447 } 448 rcu_read_unlock(); 449} 450 451static void 452resend(struct aoedev *d, struct frame *f) 453{ 454 struct sk_buff *skb; 455 struct sk_buff_head queue; 456 struct aoe_hdr *h; 457 struct aoetgt *t; 458 char buf[128]; 459 u32 n; 460 461 t = f->t; 462 n = newtag(d); 463 skb = f->skb; 464 if (ifrotate(t) == NULL) { 465 /* probably can't happen, but set it up to fail anyway */ 466 pr_info("aoe: resend: no interfaces to rotate to.\n"); 467 ktcomplete(f, NULL); 468 return; 469 } 470 h = (struct aoe_hdr *) skb_mac_header(skb); 471 472 if (!(f->flags & FFL_PROBE)) { 473 snprintf(buf, sizeof(buf), 474 "%15s e%ld.%d oldtag=%08x@%08lx newtag=%08x s=%pm d=%pm nout=%d\n", 475 "retransmit", d->aoemajor, d->aoeminor, 476 f->tag, jiffies, n, 477 h->src, h->dst, t->nout); 478 aoechr_error(buf); 479 } 480 481 f->tag = n; 482 fhash(f); 483 h->tag = cpu_to_be32(n); 484 memcpy(h->dst, t->addr, sizeof h->dst); 485 memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src); 486 487 skb->dev = t->ifp->nd; 488 skb = skb_clone(skb, GFP_ATOMIC); 489 if (skb == NULL) 490 return; 491 f->sent = ktime_get(); 492 __skb_queue_head_init(&queue); 493 __skb_queue_tail(&queue, skb); 494 aoenet_xmit(&queue); 495} 496 497static int 498tsince_hr(struct frame *f) 499{ 500 u64 delta = ktime_to_ns(ktime_sub(ktime_get(), f->sent)); 501 502 /* delta is normally under 4.2 seconds, avoid 64-bit division */ 503 if (likely(delta <= UINT_MAX)) 504 return (u32)delta / NSEC_PER_USEC; 505 506 /* avoid overflow after 71 minutes */ 507 if (delta > ((u64)INT_MAX * NSEC_PER_USEC)) 508 return INT_MAX; 509 510 return div_u64(delta, NSEC_PER_USEC); 511} 512 513static int 514tsince(u32 tag) 515{ 516 int n; 517 518 n = jiffies & 0xffff; 519 n -= tag & 0xffff; 520 if (n < 0) 521 n += 1<<16; 522 return jiffies_to_usecs(n + 1); 523} 524 525static struct aoeif * 526getif(struct aoetgt *t, struct net_device *nd) 527{ 528 struct aoeif *p, *e; 529 530 p = t->ifs; 531 e = p + NAOEIFS; 532 for (; p < e; p++) 533 if (p->nd == nd) 534 return p; 535 return NULL; 536} 537 538static void 539ejectif(struct aoetgt *t, struct aoeif *ifp) 540{ 541 struct aoeif *e; 542 struct net_device *nd; 543 ulong n; 544 545 nd = ifp->nd; 546 e = t->ifs + NAOEIFS - 1; 547 n = (e - ifp) * sizeof *ifp; 548 memmove(ifp, ifp+1, n); 549 e->nd = NULL; 550 dev_put(nd); 551} 552 553static struct frame * 554reassign_frame(struct frame *f) 555{ 556 struct frame *nf; 557 struct sk_buff *skb; 558 559 nf = newframe(f->t->d); 560 if (!nf) 561 return NULL; 562 if (nf->t == f->t) { 563 aoe_freetframe(nf); 564 return NULL; 565 } 566 567 skb = nf->skb; 568 nf->skb = f->skb; 569 nf->buf = f->buf; 570 nf->iter = f->iter; 571 nf->waited = 0; 572 nf->waited_total = f->waited_total; 573 nf->sent = f->sent; 574 f->skb = skb; 575 576 return nf; 577} 578 579static void 580probe(struct aoetgt *t) 581{ 582 struct aoedev *d; 583 struct frame *f; 584 struct sk_buff *skb; 585 struct sk_buff_head queue; 586 size_t n, m; 587 int frag; 588 589 d = t->d; 590 f = newtframe(d, t); 591 if (!f) { 592 pr_err("%s %pm for e%ld.%d: %s\n", 593 "aoe: cannot probe remote address", 594 t->addr, 595 (long) d->aoemajor, d->aoeminor, 596 "no frame available"); 597 return; 598 } 599 f->flags |= FFL_PROBE; 600 ifrotate(t); 601 f->iter.bi_size = t->d->maxbcnt ? t->d->maxbcnt : DEFAULTBCNT; 602 ata_rw_frameinit(f); 603 skb = f->skb; 604 for (frag = 0, n = f->iter.bi_size; n > 0; ++frag, n -= m) { 605 if (n < PAGE_SIZE) 606 m = n; 607 else 608 m = PAGE_SIZE; 609 skb_fill_page_desc(skb, frag, empty_page, 0, m); 610 } 611 skb->len += f->iter.bi_size; 612 skb->data_len = f->iter.bi_size; 613 skb->truesize += f->iter.bi_size; 614 615 skb = skb_clone(f->skb, GFP_ATOMIC); 616 if (skb) { 617 f->sent = ktime_get(); 618 __skb_queue_head_init(&queue); 619 __skb_queue_tail(&queue, skb); 620 aoenet_xmit(&queue); 621 } 622} 623 624static long 625rto(struct aoedev *d) 626{ 627 long t; 628 629 t = 2 * d->rttavg >> RTTSCALE; 630 t += 8 * d->rttdev >> RTTDSCALE; 631 if (t == 0) 632 t = 1; 633 634 return t; 635} 636 637static void 638rexmit_deferred(struct aoedev *d) 639{ 640 struct aoetgt *t; 641 struct frame *f; 642 struct frame *nf; 643 struct list_head *pos, *nx, *head; 644 int since; 645 int untainted; 646 647 count_targets(d, &untainted); 648 649 head = &d->rexmitq; 650 list_for_each_safe(pos, nx, head) { 651 f = list_entry(pos, struct frame, head); 652 t = f->t; 653 if (t->taint) { 654 if (!(f->flags & FFL_PROBE)) { 655 nf = reassign_frame(f); 656 if (nf) { 657 if (t->nout_probes == 0 658 && untainted > 0) { 659 probe(t); 660 t->nout_probes++; 661 } 662 list_replace(&f->head, &nf->head); 663 pos = &nf->head; 664 aoe_freetframe(f); 665 f = nf; 666 t = f->t; 667 } 668 } else if (untainted < 1) { 669 /* don't probe w/o other untainted aoetgts */ 670 goto stop_probe; 671 } else if (tsince_hr(f) < t->taint * rto(d)) { 672 /* reprobe slowly when taint is high */ 673 continue; 674 } 675 } else if (f->flags & FFL_PROBE) { 676stop_probe: /* don't probe untainted aoetgts */ 677 list_del(pos); 678 aoe_freetframe(f); 679 /* leaving d->kicked, because this is routine */ 680 f->t->d->flags |= DEVFL_KICKME; 681 continue; 682 } 683 if (t->nout >= t->maxout) 684 continue; 685 list_del(pos); 686 t->nout++; 687 if (f->flags & FFL_PROBE) 688 t->nout_probes++; 689 since = tsince_hr(f); 690 f->waited += since; 691 f->waited_total += since; 692 resend(d, f); 693 } 694} 695 696/* An aoetgt accumulates demerits quickly, and successful 697 * probing redeems the aoetgt slowly. 698 */ 699static void 700scorn(struct aoetgt *t) 701{ 702 int n; 703 704 n = t->taint++; 705 t->taint += t->taint * 2; 706 if (n > t->taint) 707 t->taint = n; 708 if (t->taint > MAX_TAINT) 709 t->taint = MAX_TAINT; 710} 711 712static int 713count_targets(struct aoedev *d, int *untainted) 714{ 715 int i, good; 716 717 for (i = good = 0; i < d->ntargets && d->targets[i]; ++i) 718 if (d->targets[i]->taint == 0) 719 good++; 720 721 if (untainted) 722 *untainted = good; 723 return i; 724} 725 726static void 727rexmit_timer(struct timer_list *timer) 728{ 729 struct aoedev *d; 730 struct aoetgt *t; 731 struct aoeif *ifp; 732 struct frame *f; 733 struct list_head *head, *pos, *nx; 734 LIST_HEAD(flist); 735 register long timeout; 736 ulong flags, n; 737 int i; 738 int utgts; /* number of aoetgt descriptors (not slots) */ 739 int since; 740 741 d = from_timer(d, timer, timer); 742 743 spin_lock_irqsave(&d->lock, flags); 744 745 /* timeout based on observed timings and variations */ 746 timeout = rto(d); 747 748 utgts = count_targets(d, NULL); 749 750 if (d->flags & DEVFL_TKILL) { 751 spin_unlock_irqrestore(&d->lock, flags); 752 return; 753 } 754 755 /* collect all frames to rexmit into flist */ 756 for (i = 0; i < NFACTIVE; i++) { 757 head = &d->factive[i]; 758 list_for_each_safe(pos, nx, head) { 759 f = list_entry(pos, struct frame, head); 760 if (tsince_hr(f) < timeout) 761 break; /* end of expired frames */ 762 /* move to flist for later processing */ 763 list_move_tail(pos, &flist); 764 } 765 } 766 767 /* process expired frames */ 768 while (!list_empty(&flist)) { 769 pos = flist.next; 770 f = list_entry(pos, struct frame, head); 771 since = tsince_hr(f); 772 n = f->waited_total + since; 773 n /= USEC_PER_SEC; 774 if (aoe_deadsecs 775 && n > aoe_deadsecs 776 && !(f->flags & FFL_PROBE)) { 777 /* Waited too long. Device failure. 778 * Hang all frames on first hash bucket for downdev 779 * to clean up. 780 */ 781 list_splice(&flist, &d->factive[0]); 782 aoedev_downdev(d); 783 goto out; 784 } 785 786 t = f->t; 787 n = f->waited + since; 788 n /= USEC_PER_SEC; 789 if (aoe_deadsecs && utgts > 0 790 && (n > aoe_deadsecs / utgts || n > HARD_SCORN_SECS)) 791 scorn(t); /* avoid this target */ 792 793 if (t->maxout != 1) { 794 t->ssthresh = t->maxout / 2; 795 t->maxout = 1; 796 } 797 798 if (f->flags & FFL_PROBE) { 799 t->nout_probes--; 800 } else { 801 ifp = getif(t, f->skb->dev); 802 if (ifp && ++ifp->lost > (t->nframes << 1) 803 && (ifp != t->ifs || t->ifs[1].nd)) { 804 ejectif(t, ifp); 805 ifp = NULL; 806 } 807 } 808 list_move_tail(pos, &d->rexmitq); 809 t->nout--; 810 } 811 rexmit_deferred(d); 812 813out: 814 if ((d->flags & DEVFL_KICKME) && d->blkq) { 815 d->flags &= ~DEVFL_KICKME; 816 blk_mq_run_hw_queues(d->blkq, true); 817 } 818 819 d->timer.expires = jiffies + TIMERTICK; 820 add_timer(&d->timer); 821 822 spin_unlock_irqrestore(&d->lock, flags); 823} 824 825static void 826bufinit(struct buf *buf, struct request *rq, struct bio *bio) 827{ 828 memset(buf, 0, sizeof(*buf)); 829 buf->rq = rq; 830 buf->bio = bio; 831 buf->iter = bio->bi_iter; 832} 833 834static struct buf * 835nextbuf(struct aoedev *d) 836{ 837 struct request *rq; 838 struct request_queue *q; 839 struct aoe_req *req; 840 struct buf *buf; 841 struct bio *bio; 842 843 q = d->blkq; 844 if (q == NULL) 845 return NULL; /* initializing */ 846 if (d->ip.buf) 847 return d->ip.buf; 848 rq = d->ip.rq; 849 if (rq == NULL) { 850 rq = list_first_entry_or_null(&d->rq_list, struct request, 851 queuelist); 852 if (rq == NULL) 853 return NULL; 854 list_del_init(&rq->queuelist); 855 blk_mq_start_request(rq); 856 d->ip.rq = rq; 857 d->ip.nxbio = rq->bio; 858 859 req = blk_mq_rq_to_pdu(rq); 860 req->nr_bios = 0; 861 __rq_for_each_bio(bio, rq) 862 req->nr_bios++; 863 } 864 buf = mempool_alloc(d->bufpool, GFP_ATOMIC); 865 if (buf == NULL) { 866 pr_err("aoe: nextbuf: unable to mempool_alloc!\n"); 867 return NULL; 868 } 869 bio = d->ip.nxbio; 870 bufinit(buf, rq, bio); 871 bio = bio->bi_next; 872 d->ip.nxbio = bio; 873 if (bio == NULL) 874 d->ip.rq = NULL; 875 return d->ip.buf = buf; 876} 877 878/* enters with d->lock held */ 879void 880aoecmd_work(struct aoedev *d) 881{ 882 rexmit_deferred(d); 883 while (aoecmd_ata_rw(d)) 884 ; 885} 886 887/* this function performs work that has been deferred until sleeping is OK 888 */ 889void 890aoecmd_sleepwork(struct work_struct *work) 891{ 892 struct aoedev *d = container_of(work, struct aoedev, work); 893 struct block_device *bd; 894 u64 ssize; 895 896 if (d->flags & DEVFL_GDALLOC) 897 aoeblk_gdalloc(d); 898 899 if (d->flags & DEVFL_NEWSIZE) { 900 ssize = get_capacity(d->gd); 901 bd = bdget_disk(d->gd, 0); 902 if (bd) { 903 bd_set_nr_sectors(bd, ssize); 904 bdput(bd); 905 } 906 spin_lock_irq(&d->lock); 907 d->flags |= DEVFL_UP; 908 d->flags &= ~DEVFL_NEWSIZE; 909 spin_unlock_irq(&d->lock); 910 } 911} 912 913static void 914ata_ident_fixstring(u16 *id, int ns) 915{ 916 u16 s; 917 918 while (ns-- > 0) { 919 s = *id; 920 *id++ = s >> 8 | s << 8; 921 } 922} 923 924static void 925ataid_complete(struct aoedev *d, struct aoetgt *t, unsigned char *id) 926{ 927 u64 ssize; 928 u16 n; 929 930 /* word 83: command set supported */ 931 n = get_unaligned_le16(&id[83 << 1]); 932 933 /* word 86: command set/feature enabled */ 934 n |= get_unaligned_le16(&id[86 << 1]); 935 936 if (n & (1<<10)) { /* bit 10: LBA 48 */ 937 d->flags |= DEVFL_EXT; 938 939 /* word 100: number lba48 sectors */ 940 ssize = get_unaligned_le64(&id[100 << 1]); 941 942 /* set as in ide-disk.c:init_idedisk_capacity */ 943 d->geo.cylinders = ssize; 944 d->geo.cylinders /= (255 * 63); 945 d->geo.heads = 255; 946 d->geo.sectors = 63; 947 } else { 948 d->flags &= ~DEVFL_EXT; 949 950 /* number lba28 sectors */ 951 ssize = get_unaligned_le32(&id[60 << 1]); 952 953 /* NOTE: obsolete in ATA 6 */ 954 d->geo.cylinders = get_unaligned_le16(&id[54 << 1]); 955 d->geo.heads = get_unaligned_le16(&id[55 << 1]); 956 d->geo.sectors = get_unaligned_le16(&id[56 << 1]); 957 } 958 959 ata_ident_fixstring((u16 *) &id[10<<1], 10); /* serial */ 960 ata_ident_fixstring((u16 *) &id[23<<1], 4); /* firmware */ 961 ata_ident_fixstring((u16 *) &id[27<<1], 20); /* model */ 962 memcpy(d->ident, id, sizeof(d->ident)); 963 964 if (d->ssize != ssize) 965 printk(KERN_INFO 966 "aoe: %pm e%ld.%d v%04x has %llu sectors\n", 967 t->addr, 968 d->aoemajor, d->aoeminor, 969 d->fw_ver, (long long)ssize); 970 d->ssize = ssize; 971 d->geo.start = 0; 972 if (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE)) 973 return; 974 if (d->gd != NULL) { 975 set_capacity(d->gd, ssize); 976 d->flags |= DEVFL_NEWSIZE; 977 } else 978 d->flags |= DEVFL_GDALLOC; 979 schedule_work(&d->work); 980} 981 982static void 983calc_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 1007static struct aoetgt * 1008gettgt(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 1020static void 1021bvcpy(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 = kmap_atomic(bv.bv_page) + bv.bv_offset; 1030 skb_copy_bits(skb, soff, p, bv.bv_len); 1031 kunmap_atomic(p); 1032 soff += bv.bv_len; 1033 } 1034} 1035 1036void 1037aoe_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. http://lkml.org/lkml/2006/10/31/28 */ 1057 if (!fastfail) 1058 blk_mq_run_hw_queues(q, true); 1059} 1060 1061static void 1062aoe_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 1074static void 1075ktiocomplete(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); 1110noskb: 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 } 1165out: 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 */ 1190static int 1191ktio(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 1224static int 1225kthread(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 1253void 1254aoe_ktstop(struct ktstate *k) 1255{ 1256 kthread_stop(k->task); 1257 wait_for_completion(&k->rendez); 1258} 1259 1260int 1261aoe_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 */ 1276static void 1277ktcomplete(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 1299struct sk_buff * 1300aoecmd_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 1364void 1365aoecmd_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 1374struct sk_buff * 1375aoecmd_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 skb->dev = t->ifp->nd; 1407 1408 d->rttavg = RTTAVG_INIT; 1409 d->rttdev = RTTDEV_INIT; 1410 d->timer.function = rexmit_timer; 1411 1412 skb = skb_clone(skb, GFP_ATOMIC); 1413 if (skb) 1414 f->sent = ktime_get(); 1415 1416 return skb; 1417} 1418 1419static struct aoetgt ** 1420grow_targets(struct aoedev *d) 1421{ 1422 ulong oldn, newn; 1423 struct aoetgt **tt; 1424 1425 oldn = d->ntargets; 1426 newn = oldn * 2; 1427 tt = kcalloc(newn, sizeof(*d->targets), GFP_ATOMIC); 1428 if (!tt) 1429 return NULL; 1430 memmove(tt, d->targets, sizeof(*d->targets) * oldn); 1431 d->tgt = tt + (d->tgt - d->targets); 1432 kfree(d->targets); 1433 d->targets = tt; 1434 d->ntargets = newn; 1435 1436 return &d->targets[oldn]; 1437} 1438 1439static struct aoetgt * 1440addtgt(struct aoedev *d, char *addr, ulong nframes) 1441{ 1442 struct aoetgt *t, **tt, **te; 1443 1444 tt = d->targets; 1445 te = tt + d->ntargets; 1446 for (; tt < te && *tt; tt++) 1447 ; 1448 1449 if (tt == te) { 1450 tt = grow_targets(d); 1451 if (!tt) 1452 goto nomem; 1453 } 1454 t = kzalloc(sizeof(*t), GFP_ATOMIC); 1455 if (!t) 1456 goto nomem; 1457 t->nframes = nframes; 1458 t->d = d; 1459 memcpy(t->addr, addr, sizeof t->addr); 1460 t->ifp = t->ifs; 1461 aoecmd_wreset(t); 1462 t->maxout = t->nframes / 2; 1463 INIT_LIST_HEAD(&t->ffree); 1464 return *tt = t; 1465 1466 nomem: 1467 pr_info("aoe: cannot allocate memory to add target\n"); 1468 return NULL; 1469} 1470 1471static void 1472setdbcnt(struct aoedev *d) 1473{ 1474 struct aoetgt **t, **e; 1475 int bcnt = 0; 1476 1477 t = d->targets; 1478 e = t + d->ntargets; 1479 for (; t < e && *t; t++) 1480 if (bcnt == 0 || bcnt > (*t)->minbcnt) 1481 bcnt = (*t)->minbcnt; 1482 if (bcnt != d->maxbcnt) { 1483 d->maxbcnt = bcnt; 1484 pr_info("aoe: e%ld.%d: setting %d byte data frames\n", 1485 d->aoemajor, d->aoeminor, bcnt); 1486 } 1487} 1488 1489static void 1490setifbcnt(struct aoetgt *t, struct net_device *nd, int bcnt) 1491{ 1492 struct aoedev *d; 1493 struct aoeif *p, *e; 1494 int minbcnt; 1495 1496 d = t->d; 1497 minbcnt = bcnt; 1498 p = t->ifs; 1499 e = p + NAOEIFS; 1500 for (; p < e; p++) { 1501 if (p->nd == NULL) 1502 break; /* end of the valid interfaces */ 1503 if (p->nd == nd) { 1504 p->bcnt = bcnt; /* we're updating */ 1505 nd = NULL; 1506 } else if (minbcnt > p->bcnt) 1507 minbcnt = p->bcnt; /* find the min interface */ 1508 } 1509 if (nd) { 1510 if (p == e) { 1511 pr_err("aoe: device setifbcnt failure; too many interfaces.\n"); 1512 return; 1513 } 1514 dev_hold(nd); 1515 p->nd = nd; 1516 p->bcnt = bcnt; 1517 } 1518 t->minbcnt = minbcnt; 1519 setdbcnt(d); 1520} 1521 1522void 1523aoecmd_cfg_rsp(struct sk_buff *skb) 1524{ 1525 struct aoedev *d; 1526 struct aoe_hdr *h; 1527 struct aoe_cfghdr *ch; 1528 struct aoetgt *t; 1529 ulong flags, aoemajor; 1530 struct sk_buff *sl; 1531 struct sk_buff_head queue; 1532 u16 n; 1533 1534 sl = NULL; 1535 h = (struct aoe_hdr *) skb_mac_header(skb); 1536 ch = (struct aoe_cfghdr *) (h+1); 1537 1538 /* 1539 * Enough people have their dip switches set backwards to 1540 * warrant a loud message for this special case. 1541 */ 1542 aoemajor = get_unaligned_be16(&h->major); 1543 if (aoemajor == 0xfff) { 1544 printk(KERN_ERR "aoe: Warning: shelf address is all ones. " 1545 "Check shelf dip switches.\n"); 1546 return; 1547 } 1548 if (aoemajor == 0xffff) { 1549 pr_info("aoe: e%ld.%d: broadcast shelf number invalid\n", 1550 aoemajor, (int) h->minor); 1551 return; 1552 } 1553 if (h->minor == 0xff) { 1554 pr_info("aoe: e%ld.%d: broadcast slot number invalid\n", 1555 aoemajor, (int) h->minor); 1556 return; 1557 } 1558 1559 n = be16_to_cpu(ch->bufcnt); 1560 if (n > aoe_maxout) /* keep it reasonable */ 1561 n = aoe_maxout; 1562 1563 d = aoedev_by_aoeaddr(aoemajor, h->minor, 1); 1564 if (d == NULL) { 1565 pr_info("aoe: device allocation failure\n"); 1566 return; 1567 } 1568 1569 spin_lock_irqsave(&d->lock, flags); 1570 1571 t = gettgt(d, h->src); 1572 if (t) { 1573 t->nframes = n; 1574 if (n < t->maxout) 1575 aoecmd_wreset(t); 1576 } else { 1577 t = addtgt(d, h->src, n); 1578 if (!t) 1579 goto bail; 1580 } 1581 n = skb->dev->mtu; 1582 n -= sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr); 1583 n /= 512; 1584 if (n > ch->scnt) 1585 n = ch->scnt; 1586 n = n ? n * 512 : DEFAULTBCNT; 1587 setifbcnt(t, skb->dev, n); 1588 1589 /* don't change users' perspective */ 1590 if (d->nopen == 0) { 1591 d->fw_ver = be16_to_cpu(ch->fwver); 1592 sl = aoecmd_ata_id(d); 1593 } 1594bail: 1595 spin_unlock_irqrestore(&d->lock, flags); 1596 aoedev_put(d); 1597 if (sl) { 1598 __skb_queue_head_init(&queue); 1599 __skb_queue_tail(&queue, sl); 1600 aoenet_xmit(&queue); 1601 } 1602} 1603 1604void 1605aoecmd_wreset(struct aoetgt *t) 1606{ 1607 t->maxout = 1; 1608 t->ssthresh = t->nframes / 2; 1609 t->next_cwnd = t->nframes; 1610} 1611 1612void 1613aoecmd_cleanslate(struct aoedev *d) 1614{ 1615 struct aoetgt **t, **te; 1616 1617 d->rttavg = RTTAVG_INIT; 1618 d->rttdev = RTTDEV_INIT; 1619 d->maxbcnt = 0; 1620 1621 t = d->targets; 1622 te = t + d->ntargets; 1623 for (; t < te && *t; t++) 1624 aoecmd_wreset(*t); 1625} 1626 1627void 1628aoe_failbuf(struct aoedev *d, struct buf *buf) 1629{ 1630 if (buf == NULL) 1631 return; 1632 buf->iter.bi_size = 0; 1633 buf->bio->bi_status = BLK_STS_IOERR; 1634 if (buf->nframesout == 0) 1635 aoe_end_buf(d, buf); 1636} 1637 1638void 1639aoe_flush_iocq(void) 1640{ 1641 int i; 1642 1643 for (i = 0; i < ncpus; i++) { 1644 if (kts[i].active) 1645 aoe_flush_iocq_by_index(i); 1646 } 1647} 1648 1649void 1650aoe_flush_iocq_by_index(int id) 1651{ 1652 struct frame *f; 1653 struct aoedev *d; 1654 LIST_HEAD(flist); 1655 struct list_head *pos; 1656 struct sk_buff *skb; 1657 ulong flags; 1658 1659 spin_lock_irqsave(&iocq[id].lock, flags); 1660 list_splice_init(&iocq[id].head, &flist); 1661 spin_unlock_irqrestore(&iocq[id].lock, flags); 1662 while (!list_empty(&flist)) { 1663 pos = flist.next; 1664 list_del(pos); 1665 f = list_entry(pos, struct frame, head); 1666 d = f->t->d; 1667 skb = f->r_skb; 1668 spin_lock_irqsave(&d->lock, flags); 1669 if (f->buf) { 1670 f->buf->nframesout--; 1671 aoe_failbuf(d, f->buf); 1672 } 1673 aoe_freetframe(f); 1674 spin_unlock_irqrestore(&d->lock, flags); 1675 dev_kfree_skb(skb); 1676 aoedev_put(d); 1677 } 1678} 1679 1680int __init 1681aoecmd_init(void) 1682{ 1683 void *p; 1684 int i; 1685 int ret; 1686 1687 /* get_zeroed_page returns page with ref count 1 */ 1688 p = (void *) get_zeroed_page(GFP_KERNEL); 1689 if (!p) 1690 return -ENOMEM; 1691 empty_page = virt_to_page(p); 1692 1693 ncpus = num_online_cpus(); 1694 1695 iocq = kcalloc(ncpus, sizeof(struct iocq_ktio), GFP_KERNEL); 1696 if (!iocq) 1697 return -ENOMEM; 1698 1699 kts = kcalloc(ncpus, sizeof(struct ktstate), GFP_KERNEL); 1700 if (!kts) { 1701 ret = -ENOMEM; 1702 goto kts_fail; 1703 } 1704 1705 ktiowq = kcalloc(ncpus, sizeof(wait_queue_head_t), GFP_KERNEL); 1706 if (!ktiowq) { 1707 ret = -ENOMEM; 1708 goto ktiowq_fail; 1709 } 1710 1711 mutex_init(&ktio_spawn_lock); 1712 1713 for (i = 0; i < ncpus; i++) { 1714 INIT_LIST_HEAD(&iocq[i].head); 1715 spin_lock_init(&iocq[i].lock); 1716 init_waitqueue_head(&ktiowq[i]); 1717 snprintf(kts[i].name, sizeof(kts[i].name), "aoe_ktio%d", i); 1718 kts[i].fn = ktio; 1719 kts[i].waitq = &ktiowq[i]; 1720 kts[i].lock = &iocq[i].lock; 1721 kts[i].id = i; 1722 kts[i].active = 0; 1723 } 1724 kts[0].active = 1; 1725 if (aoe_ktstart(&kts[0])) { 1726 ret = -ENOMEM; 1727 goto ktstart_fail; 1728 } 1729 return 0; 1730 1731ktstart_fail: 1732 kfree(ktiowq); 1733ktiowq_fail: 1734 kfree(kts); 1735kts_fail: 1736 kfree(iocq); 1737 1738 return ret; 1739} 1740 1741void 1742aoecmd_exit(void) 1743{ 1744 int i; 1745 1746 for (i = 0; i < ncpus; i++) 1747 if (kts[i].active) 1748 aoe_ktstop(&kts[i]); 1749 1750 aoe_flush_iocq(); 1751 1752 /* Free up the iocq and thread speicific configuration 1753 * allocated during startup. 1754 */ 1755 kfree(iocq); 1756 kfree(kts); 1757 kfree(ktiowq); 1758 1759 free_page((unsigned long) page_address(empty_page)); 1760 empty_page = NULL; 1761} 1762