Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* Copyright (c) 2004 Coraid, Inc. See COPYING for GPL terms. */ |
| 2 | /* |
| 3 | * aoecmd.c |
| 4 | * Filesystem request handling methods |
| 5 | */ |
| 6 | |
| 7 | #include <linux/hdreg.h> |
| 8 | #include <linux/blkdev.h> |
| 9 | #include <linux/skbuff.h> |
| 10 | #include <linux/netdevice.h> |
| 11 | #include "aoe.h" |
| 12 | |
| 13 | #define TIMERTICK (HZ / 10) |
| 14 | #define MINTIMER (2 * TIMERTICK) |
| 15 | #define MAXTIMER (HZ << 1) |
| 16 | #define MAXWAIT (60 * 3) /* After MAXWAIT seconds, give up and fail dev */ |
| 17 | |
| 18 | static struct sk_buff * |
| 19 | new_skb(struct net_device *if_dev, ulong len) |
| 20 | { |
| 21 | struct sk_buff *skb; |
| 22 | |
| 23 | skb = alloc_skb(len, GFP_ATOMIC); |
| 24 | if (skb) { |
| 25 | skb->nh.raw = skb->mac.raw = skb->data; |
| 26 | skb->dev = if_dev; |
| 27 | skb->protocol = __constant_htons(ETH_P_AOE); |
| 28 | skb->priority = 0; |
| 29 | skb_put(skb, len); |
| 30 | skb->next = skb->prev = NULL; |
| 31 | |
| 32 | /* tell the network layer not to perform IP checksums |
| 33 | * or to get the NIC to do it |
| 34 | */ |
| 35 | skb->ip_summed = CHECKSUM_NONE; |
| 36 | } |
| 37 | return skb; |
| 38 | } |
| 39 | |
| 40 | static struct sk_buff * |
| 41 | skb_prepare(struct aoedev *d, struct frame *f) |
| 42 | { |
| 43 | struct sk_buff *skb; |
| 44 | char *p; |
| 45 | |
| 46 | skb = new_skb(d->ifp, f->ndata + f->writedatalen); |
| 47 | if (!skb) { |
| 48 | printk(KERN_INFO "aoe: skb_prepare: failure to allocate skb\n"); |
| 49 | return NULL; |
| 50 | } |
| 51 | |
| 52 | p = skb->mac.raw; |
| 53 | memcpy(p, f->data, f->ndata); |
| 54 | |
| 55 | if (f->writedatalen) { |
| 56 | p += sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr); |
| 57 | memcpy(p, f->bufaddr, f->writedatalen); |
| 58 | } |
| 59 | |
| 60 | return skb; |
| 61 | } |
| 62 | |
| 63 | static struct frame * |
| 64 | getframe(struct aoedev *d, int tag) |
| 65 | { |
| 66 | struct frame *f, *e; |
| 67 | |
| 68 | f = d->frames; |
| 69 | e = f + d->nframes; |
| 70 | for (; f<e; f++) |
| 71 | if (f->tag == tag) |
| 72 | return f; |
| 73 | return NULL; |
| 74 | } |
| 75 | |
| 76 | /* |
| 77 | * Leave the top bit clear so we have tagspace for userland. |
| 78 | * The bottom 16 bits are the xmit tick for rexmit/rttavg processing. |
| 79 | * This driver reserves tag -1 to mean "unused frame." |
| 80 | */ |
| 81 | static int |
| 82 | newtag(struct aoedev *d) |
| 83 | { |
| 84 | register ulong n; |
| 85 | |
| 86 | n = jiffies & 0xffff; |
| 87 | return n |= (++d->lasttag & 0x7fff) << 16; |
| 88 | } |
| 89 | |
| 90 | static int |
| 91 | aoehdr_atainit(struct aoedev *d, struct aoe_hdr *h) |
| 92 | { |
| 93 | u16 type = __constant_cpu_to_be16(ETH_P_AOE); |
| 94 | u16 aoemajor = __cpu_to_be16(d->aoemajor); |
| 95 | u32 host_tag = newtag(d); |
| 96 | u32 tag = __cpu_to_be32(host_tag); |
| 97 | |
| 98 | memcpy(h->src, d->ifp->dev_addr, sizeof h->src); |
| 99 | memcpy(h->dst, d->addr, sizeof h->dst); |
| 100 | memcpy(h->type, &type, sizeof type); |
| 101 | h->verfl = AOE_HVER; |
| 102 | memcpy(h->major, &aoemajor, sizeof aoemajor); |
| 103 | h->minor = d->aoeminor; |
| 104 | h->cmd = AOECMD_ATA; |
| 105 | memcpy(h->tag, &tag, sizeof tag); |
| 106 | |
| 107 | return host_tag; |
| 108 | } |
| 109 | |
| 110 | static void |
| 111 | aoecmd_ata_rw(struct aoedev *d, struct frame *f) |
| 112 | { |
| 113 | struct aoe_hdr *h; |
| 114 | struct aoe_atahdr *ah; |
| 115 | struct buf *buf; |
| 116 | struct sk_buff *skb; |
| 117 | ulong bcnt; |
| 118 | register sector_t sector; |
| 119 | char writebit, extbit; |
| 120 | |
| 121 | writebit = 0x10; |
| 122 | extbit = 0x4; |
| 123 | |
| 124 | buf = d->inprocess; |
| 125 | |
| 126 | sector = buf->sector; |
| 127 | bcnt = buf->bv_resid; |
| 128 | if (bcnt > MAXATADATA) |
| 129 | bcnt = MAXATADATA; |
| 130 | |
| 131 | /* initialize the headers & frame */ |
| 132 | h = (struct aoe_hdr *) f->data; |
| 133 | ah = (struct aoe_atahdr *) (h+1); |
| 134 | f->ndata = sizeof *h + sizeof *ah; |
| 135 | memset(h, 0, f->ndata); |
| 136 | f->tag = aoehdr_atainit(d, h); |
| 137 | f->waited = 0; |
| 138 | f->buf = buf; |
| 139 | f->bufaddr = buf->bufaddr; |
| 140 | |
| 141 | /* set up ata header */ |
| 142 | ah->scnt = bcnt >> 9; |
| 143 | ah->lba0 = sector; |
| 144 | ah->lba1 = sector >>= 8; |
| 145 | ah->lba2 = sector >>= 8; |
| 146 | ah->lba3 = sector >>= 8; |
| 147 | if (d->flags & DEVFL_EXT) { |
| 148 | ah->aflags |= AOEAFL_EXT; |
| 149 | ah->lba4 = sector >>= 8; |
| 150 | ah->lba5 = sector >>= 8; |
| 151 | } else { |
| 152 | extbit = 0; |
| 153 | ah->lba3 &= 0x0f; |
| 154 | ah->lba3 |= 0xe0; /* LBA bit + obsolete 0xa0 */ |
| 155 | } |
| 156 | |
| 157 | if (bio_data_dir(buf->bio) == WRITE) { |
| 158 | ah->aflags |= AOEAFL_WRITE; |
| 159 | f->writedatalen = bcnt; |
| 160 | } else { |
| 161 | writebit = 0; |
| 162 | f->writedatalen = 0; |
| 163 | } |
| 164 | |
| 165 | ah->cmdstat = WIN_READ | writebit | extbit; |
| 166 | |
| 167 | /* mark all tracking fields and load out */ |
| 168 | buf->nframesout += 1; |
| 169 | buf->bufaddr += bcnt; |
| 170 | buf->bv_resid -= bcnt; |
| 171 | /* printk(KERN_INFO "aoe: bv_resid=%ld\n", buf->bv_resid); */ |
| 172 | buf->resid -= bcnt; |
| 173 | buf->sector += bcnt >> 9; |
| 174 | if (buf->resid == 0) { |
| 175 | d->inprocess = NULL; |
| 176 | } else if (buf->bv_resid == 0) { |
| 177 | buf->bv++; |
| 178 | buf->bv_resid = buf->bv->bv_len; |
| 179 | buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset; |
| 180 | } |
| 181 | |
| 182 | skb = skb_prepare(d, f); |
| 183 | if (skb) { |
| 184 | skb->next = d->skblist; |
| 185 | d->skblist = skb; |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | /* enters with d->lock held */ |
| 190 | void |
| 191 | aoecmd_work(struct aoedev *d) |
| 192 | { |
| 193 | struct frame *f; |
| 194 | struct buf *buf; |
| 195 | loop: |
| 196 | f = getframe(d, FREETAG); |
| 197 | if (f == NULL) |
| 198 | return; |
| 199 | if (d->inprocess == NULL) { |
| 200 | if (list_empty(&d->bufq)) |
| 201 | return; |
| 202 | buf = container_of(d->bufq.next, struct buf, bufs); |
| 203 | list_del(d->bufq.next); |
| 204 | /*printk(KERN_INFO "aoecmd_work: bi_size=%ld\n", buf->bio->bi_size); */ |
| 205 | d->inprocess = buf; |
| 206 | } |
| 207 | aoecmd_ata_rw(d, f); |
| 208 | goto loop; |
| 209 | } |
| 210 | |
| 211 | static void |
| 212 | rexmit(struct aoedev *d, struct frame *f) |
| 213 | { |
| 214 | struct sk_buff *skb; |
| 215 | struct aoe_hdr *h; |
| 216 | char buf[128]; |
| 217 | u32 n; |
| 218 | u32 net_tag; |
| 219 | |
| 220 | n = newtag(d); |
| 221 | |
| 222 | snprintf(buf, sizeof buf, |
| 223 | "%15s e%ld.%ld oldtag=%08x@%08lx newtag=%08x\n", |
| 224 | "retransmit", |
| 225 | d->aoemajor, d->aoeminor, f->tag, jiffies, n); |
| 226 | aoechr_error(buf); |
| 227 | |
| 228 | h = (struct aoe_hdr *) f->data; |
| 229 | f->tag = n; |
| 230 | net_tag = __cpu_to_be32(n); |
| 231 | memcpy(h->tag, &net_tag, sizeof net_tag); |
| 232 | |
| 233 | skb = skb_prepare(d, f); |
| 234 | if (skb) { |
| 235 | skb->next = d->skblist; |
| 236 | d->skblist = skb; |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | static int |
| 241 | tsince(int tag) |
| 242 | { |
| 243 | int n; |
| 244 | |
| 245 | n = jiffies & 0xffff; |
| 246 | n -= tag & 0xffff; |
| 247 | if (n < 0) |
| 248 | n += 1<<16; |
| 249 | return n; |
| 250 | } |
| 251 | |
| 252 | static void |
| 253 | rexmit_timer(ulong vp) |
| 254 | { |
| 255 | struct aoedev *d; |
| 256 | struct frame *f, *e; |
| 257 | struct sk_buff *sl; |
| 258 | register long timeout; |
| 259 | ulong flags, n; |
| 260 | |
| 261 | d = (struct aoedev *) vp; |
| 262 | sl = NULL; |
| 263 | |
| 264 | /* timeout is always ~150% of the moving average */ |
| 265 | timeout = d->rttavg; |
| 266 | timeout += timeout >> 1; |
| 267 | |
| 268 | spin_lock_irqsave(&d->lock, flags); |
| 269 | |
| 270 | if (d->flags & DEVFL_TKILL) { |
| 271 | tdie: spin_unlock_irqrestore(&d->lock, flags); |
| 272 | return; |
| 273 | } |
| 274 | f = d->frames; |
| 275 | e = f + d->nframes; |
| 276 | for (; f<e; f++) { |
| 277 | if (f->tag != FREETAG && tsince(f->tag) >= timeout) { |
| 278 | n = f->waited += timeout; |
| 279 | n /= HZ; |
| 280 | if (n > MAXWAIT) { /* waited too long. device failure. */ |
| 281 | aoedev_downdev(d); |
| 282 | goto tdie; |
| 283 | } |
| 284 | rexmit(d, f); |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | sl = d->skblist; |
| 289 | d->skblist = NULL; |
| 290 | if (sl) { |
| 291 | n = d->rttavg <<= 1; |
| 292 | if (n > MAXTIMER) |
| 293 | d->rttavg = MAXTIMER; |
| 294 | } |
| 295 | |
| 296 | d->timer.expires = jiffies + TIMERTICK; |
| 297 | add_timer(&d->timer); |
| 298 | |
| 299 | spin_unlock_irqrestore(&d->lock, flags); |
| 300 | |
| 301 | aoenet_xmit(sl); |
| 302 | } |
| 303 | |
| 304 | static void |
| 305 | ataid_complete(struct aoedev *d, unsigned char *id) |
| 306 | { |
| 307 | u64 ssize; |
| 308 | u16 n; |
| 309 | |
| 310 | /* word 83: command set supported */ |
| 311 | n = __le16_to_cpu(*((u16 *) &id[83<<1])); |
| 312 | |
| 313 | /* word 86: command set/feature enabled */ |
| 314 | n |= __le16_to_cpu(*((u16 *) &id[86<<1])); |
| 315 | |
| 316 | if (n & (1<<10)) { /* bit 10: LBA 48 */ |
| 317 | d->flags |= DEVFL_EXT; |
| 318 | |
| 319 | /* word 100: number lba48 sectors */ |
| 320 | ssize = __le64_to_cpu(*((u64 *) &id[100<<1])); |
| 321 | |
| 322 | /* set as in ide-disk.c:init_idedisk_capacity */ |
| 323 | d->geo.cylinders = ssize; |
| 324 | d->geo.cylinders /= (255 * 63); |
| 325 | d->geo.heads = 255; |
| 326 | d->geo.sectors = 63; |
| 327 | } else { |
| 328 | d->flags &= ~DEVFL_EXT; |
| 329 | |
| 330 | /* number lba28 sectors */ |
| 331 | ssize = __le32_to_cpu(*((u32 *) &id[60<<1])); |
| 332 | |
| 333 | /* NOTE: obsolete in ATA 6 */ |
| 334 | d->geo.cylinders = __le16_to_cpu(*((u16 *) &id[54<<1])); |
| 335 | d->geo.heads = __le16_to_cpu(*((u16 *) &id[55<<1])); |
| 336 | d->geo.sectors = __le16_to_cpu(*((u16 *) &id[56<<1])); |
| 337 | } |
| 338 | d->ssize = ssize; |
| 339 | d->geo.start = 0; |
| 340 | if (d->gd != NULL) { |
| 341 | d->gd->capacity = ssize; |
| 342 | d->flags |= DEVFL_UP; |
| 343 | return; |
| 344 | } |
| 345 | if (d->flags & DEVFL_WORKON) { |
| 346 | printk(KERN_INFO "aoe: ataid_complete: can't schedule work, it's already on! " |
| 347 | "(This really shouldn't happen).\n"); |
| 348 | return; |
| 349 | } |
| 350 | INIT_WORK(&d->work, aoeblk_gdalloc, d); |
| 351 | schedule_work(&d->work); |
| 352 | d->flags |= DEVFL_WORKON; |
| 353 | } |
| 354 | |
| 355 | static void |
| 356 | calc_rttavg(struct aoedev *d, int rtt) |
| 357 | { |
| 358 | register long n; |
| 359 | |
| 360 | n = rtt; |
| 361 | if (n < MINTIMER) |
| 362 | n = MINTIMER; |
| 363 | else if (n > MAXTIMER) |
| 364 | n = MAXTIMER; |
| 365 | |
| 366 | /* g == .25; cf. Congestion Avoidance and Control, Jacobson & Karels; 1988 */ |
| 367 | n -= d->rttavg; |
| 368 | d->rttavg += n >> 2; |
| 369 | } |
| 370 | |
| 371 | void |
| 372 | aoecmd_ata_rsp(struct sk_buff *skb) |
| 373 | { |
| 374 | struct aoedev *d; |
| 375 | struct aoe_hdr *hin; |
| 376 | struct aoe_atahdr *ahin, *ahout; |
| 377 | struct frame *f; |
| 378 | struct buf *buf; |
| 379 | struct sk_buff *sl; |
| 380 | register long n; |
| 381 | ulong flags; |
| 382 | char ebuf[128]; |
| 383 | |
| 384 | hin = (struct aoe_hdr *) skb->mac.raw; |
| 385 | d = aoedev_bymac(hin->src); |
| 386 | if (d == NULL) { |
| 387 | snprintf(ebuf, sizeof ebuf, "aoecmd_ata_rsp: ata response " |
| 388 | "for unknown device %d.%d\n", |
| 389 | __be16_to_cpu(*((u16 *) hin->major)), |
| 390 | hin->minor); |
| 391 | aoechr_error(ebuf); |
| 392 | return; |
| 393 | } |
| 394 | |
| 395 | spin_lock_irqsave(&d->lock, flags); |
| 396 | |
| 397 | f = getframe(d, __be32_to_cpu(*((u32 *) hin->tag))); |
| 398 | if (f == NULL) { |
| 399 | spin_unlock_irqrestore(&d->lock, flags); |
| 400 | snprintf(ebuf, sizeof ebuf, |
| 401 | "%15s e%d.%d tag=%08x@%08lx\n", |
| 402 | "unexpected rsp", |
| 403 | __be16_to_cpu(*((u16 *) hin->major)), |
| 404 | hin->minor, |
| 405 | __be32_to_cpu(*((u32 *) hin->tag)), |
| 406 | jiffies); |
| 407 | aoechr_error(ebuf); |
| 408 | return; |
| 409 | } |
| 410 | |
| 411 | calc_rttavg(d, tsince(f->tag)); |
| 412 | |
| 413 | ahin = (struct aoe_atahdr *) (hin+1); |
| 414 | ahout = (struct aoe_atahdr *) (f->data + sizeof(struct aoe_hdr)); |
| 415 | buf = f->buf; |
| 416 | |
| 417 | if (ahin->cmdstat & 0xa9) { /* these bits cleared on success */ |
| 418 | printk(KERN_CRIT "aoe: aoecmd_ata_rsp: ata error cmd=%2.2Xh " |
| 419 | "stat=%2.2Xh from e%ld.%ld\n", |
| 420 | ahout->cmdstat, ahin->cmdstat, |
| 421 | d->aoemajor, d->aoeminor); |
| 422 | if (buf) |
| 423 | buf->flags |= BUFFL_FAIL; |
| 424 | } else { |
| 425 | switch (ahout->cmdstat) { |
| 426 | case WIN_READ: |
| 427 | case WIN_READ_EXT: |
| 428 | n = ahout->scnt << 9; |
| 429 | if (skb->len - sizeof *hin - sizeof *ahin < n) { |
| 430 | printk(KERN_CRIT "aoe: aoecmd_ata_rsp: runt " |
| 431 | "ata data size in read. skb->len=%d\n", |
| 432 | skb->len); |
| 433 | /* fail frame f? just returning will rexmit. */ |
| 434 | spin_unlock_irqrestore(&d->lock, flags); |
| 435 | return; |
| 436 | } |
| 437 | memcpy(f->bufaddr, ahin+1, n); |
| 438 | case WIN_WRITE: |
| 439 | case WIN_WRITE_EXT: |
| 440 | break; |
| 441 | case WIN_IDENTIFY: |
| 442 | if (skb->len - sizeof *hin - sizeof *ahin < 512) { |
| 443 | printk(KERN_INFO "aoe: aoecmd_ata_rsp: runt data size " |
| 444 | "in ataid. skb->len=%d\n", skb->len); |
| 445 | spin_unlock_irqrestore(&d->lock, flags); |
| 446 | return; |
| 447 | } |
| 448 | ataid_complete(d, (char *) (ahin+1)); |
| 449 | /* d->flags |= DEVFL_WC_UPDATE; */ |
| 450 | break; |
| 451 | default: |
| 452 | printk(KERN_INFO "aoe: aoecmd_ata_rsp: unrecognized " |
| 453 | "outbound ata command %2.2Xh for %d.%d\n", |
| 454 | ahout->cmdstat, |
| 455 | __be16_to_cpu(*((u16 *) hin->major)), |
| 456 | hin->minor); |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | if (buf) { |
| 461 | buf->nframesout -= 1; |
| 462 | if (buf->nframesout == 0 && buf->resid == 0) { |
| 463 | n = (buf->flags & BUFFL_FAIL) ? -EIO : 0; |
| 464 | bio_endio(buf->bio, buf->bio->bi_size, n); |
| 465 | mempool_free(buf, d->bufpool); |
| 466 | } |
| 467 | } |
| 468 | |
| 469 | f->buf = NULL; |
| 470 | f->tag = FREETAG; |
| 471 | |
| 472 | aoecmd_work(d); |
| 473 | |
| 474 | sl = d->skblist; |
| 475 | d->skblist = NULL; |
| 476 | |
| 477 | spin_unlock_irqrestore(&d->lock, flags); |
| 478 | |
| 479 | aoenet_xmit(sl); |
| 480 | } |
| 481 | |
| 482 | void |
| 483 | aoecmd_cfg(ushort aoemajor, unsigned char aoeminor) |
| 484 | { |
| 485 | struct aoe_hdr *h; |
| 486 | struct aoe_cfghdr *ch; |
| 487 | struct sk_buff *skb, *sl; |
| 488 | struct net_device *ifp; |
| 489 | u16 aoe_type = __constant_cpu_to_be16(ETH_P_AOE); |
| 490 | u16 net_aoemajor = __cpu_to_be16(aoemajor); |
| 491 | |
| 492 | sl = NULL; |
| 493 | |
| 494 | read_lock(&dev_base_lock); |
| 495 | for (ifp = dev_base; ifp; dev_put(ifp), ifp = ifp->next) { |
| 496 | dev_hold(ifp); |
| 497 | if (!is_aoe_netif(ifp)) |
| 498 | continue; |
| 499 | |
| 500 | skb = new_skb(ifp, sizeof *h + sizeof *ch); |
| 501 | if (skb == NULL) { |
| 502 | printk(KERN_INFO "aoe: aoecmd_cfg: skb alloc failure\n"); |
| 503 | continue; |
| 504 | } |
| 505 | h = (struct aoe_hdr *) skb->mac.raw; |
| 506 | memset(h, 0, sizeof *h + sizeof *ch); |
| 507 | |
| 508 | memset(h->dst, 0xff, sizeof h->dst); |
| 509 | memcpy(h->src, ifp->dev_addr, sizeof h->src); |
| 510 | memcpy(h->type, &aoe_type, sizeof aoe_type); |
| 511 | h->verfl = AOE_HVER; |
| 512 | memcpy(h->major, &net_aoemajor, sizeof net_aoemajor); |
| 513 | h->minor = aoeminor; |
| 514 | h->cmd = AOECMD_CFG; |
| 515 | |
| 516 | skb->next = sl; |
| 517 | sl = skb; |
| 518 | } |
| 519 | read_unlock(&dev_base_lock); |
| 520 | |
| 521 | aoenet_xmit(sl); |
| 522 | } |
| 523 | |
| 524 | /* |
| 525 | * Since we only call this in one place (and it only prepares one frame) |
| 526 | * we just return the skb. Usually we'd chain it up to the d->skblist. |
| 527 | */ |
| 528 | static struct sk_buff * |
| 529 | aoecmd_ata_id(struct aoedev *d) |
| 530 | { |
| 531 | struct aoe_hdr *h; |
| 532 | struct aoe_atahdr *ah; |
| 533 | struct frame *f; |
| 534 | struct sk_buff *skb; |
| 535 | |
| 536 | f = getframe(d, FREETAG); |
| 537 | if (f == NULL) { |
| 538 | printk(KERN_CRIT "aoe: aoecmd_ata_id: can't get a frame. " |
| 539 | "This shouldn't happen.\n"); |
| 540 | return NULL; |
| 541 | } |
| 542 | |
| 543 | /* initialize the headers & frame */ |
| 544 | h = (struct aoe_hdr *) f->data; |
| 545 | ah = (struct aoe_atahdr *) (h+1); |
| 546 | f->ndata = sizeof *h + sizeof *ah; |
| 547 | memset(h, 0, f->ndata); |
| 548 | f->tag = aoehdr_atainit(d, h); |
| 549 | f->waited = 0; |
| 550 | f->writedatalen = 0; |
| 551 | |
| 552 | /* this message initializes the device, so we reset the rttavg */ |
| 553 | d->rttavg = MAXTIMER; |
| 554 | |
| 555 | /* set up ata header */ |
| 556 | ah->scnt = 1; |
| 557 | ah->cmdstat = WIN_IDENTIFY; |
| 558 | ah->lba3 = 0xa0; |
| 559 | |
| 560 | skb = skb_prepare(d, f); |
| 561 | |
| 562 | /* we now want to start the rexmit tracking */ |
| 563 | d->flags &= ~DEVFL_TKILL; |
| 564 | d->timer.data = (ulong) d; |
| 565 | d->timer.function = rexmit_timer; |
| 566 | d->timer.expires = jiffies + TIMERTICK; |
| 567 | add_timer(&d->timer); |
| 568 | |
| 569 | return skb; |
| 570 | } |
| 571 | |
| 572 | void |
| 573 | aoecmd_cfg_rsp(struct sk_buff *skb) |
| 574 | { |
| 575 | struct aoedev *d; |
| 576 | struct aoe_hdr *h; |
| 577 | struct aoe_cfghdr *ch; |
| 578 | ulong flags, bufcnt, sysminor, aoemajor; |
| 579 | struct sk_buff *sl; |
| 580 | enum { MAXFRAMES = 8, MAXSYSMINOR = 255 }; |
| 581 | |
| 582 | h = (struct aoe_hdr *) skb->mac.raw; |
| 583 | ch = (struct aoe_cfghdr *) (h+1); |
| 584 | |
| 585 | /* |
| 586 | * Enough people have their dip switches set backwards to |
| 587 | * warrant a loud message for this special case. |
| 588 | */ |
| 589 | aoemajor = __be16_to_cpu(*((u16 *) h->major)); |
| 590 | if (aoemajor == 0xfff) { |
| 591 | printk(KERN_CRIT "aoe: aoecmd_cfg_rsp: Warning: shelf " |
| 592 | "address is all ones. Check shelf dip switches\n"); |
| 593 | return; |
| 594 | } |
| 595 | |
| 596 | sysminor = SYSMINOR(aoemajor, h->minor); |
| 597 | if (sysminor > MAXSYSMINOR) { |
| 598 | printk(KERN_INFO "aoe: aoecmd_cfg_rsp: sysminor %ld too " |
| 599 | "large\n", sysminor); |
| 600 | return; |
| 601 | } |
| 602 | |
| 603 | bufcnt = __be16_to_cpu(*((u16 *) ch->bufcnt)); |
| 604 | if (bufcnt > MAXFRAMES) /* keep it reasonable */ |
| 605 | bufcnt = MAXFRAMES; |
| 606 | |
| 607 | d = aoedev_set(sysminor, h->src, skb->dev, bufcnt); |
| 608 | if (d == NULL) { |
| 609 | printk(KERN_INFO "aoe: aoecmd_cfg_rsp: device set failure\n"); |
| 610 | return; |
| 611 | } |
| 612 | |
| 613 | spin_lock_irqsave(&d->lock, flags); |
| 614 | |
| 615 | if (d->flags & (DEVFL_UP | DEVFL_CLOSEWAIT)) { |
| 616 | spin_unlock_irqrestore(&d->lock, flags); |
| 617 | return; |
| 618 | } |
| 619 | |
| 620 | d->fw_ver = __be16_to_cpu(*((u16 *) ch->fwver)); |
| 621 | |
| 622 | /* we get here only if the device is new */ |
| 623 | sl = aoecmd_ata_id(d); |
| 624 | |
| 625 | spin_unlock_irqrestore(&d->lock, flags); |
| 626 | |
| 627 | aoenet_xmit(sl); |
| 628 | } |
| 629 | |