1 /* 2 * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver. 3 * 4 * Copyright (c) 2010 Chelsio Communications, Inc. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation. 9 * 10 * Written by: Karen Xie (kxie@chelsio.com) 11 * Written by: Rakesh Ranjan (rranjan@chelsio.com) 12 */ 13 14 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ 15 16 #include <linux/skbuff.h> 17 #include <linux/crypto.h> 18 #include <linux/scatterlist.h> 19 #include <linux/pci.h> 20 #include <scsi/scsi.h> 21 #include <scsi/scsi_cmnd.h> 22 #include <scsi/scsi_host.h> 23 #include <linux/if_vlan.h> 24 #include <linux/inet.h> 25 #include <net/dst.h> 26 #include <net/route.h> 27 #include <linux/inetdevice.h> /* ip_dev_find */ 28 #include <linux/module.h> 29 #include <net/tcp.h> 30 31 static unsigned int dbg_level; 32 33 #include "libcxgbi.h" 34 35 #define DRV_MODULE_NAME "libcxgbi" 36 #define DRV_MODULE_DESC "Chelsio iSCSI driver library" 37 #define DRV_MODULE_VERSION "0.9.0" 38 #define DRV_MODULE_RELDATE "Jun. 2010" 39 40 MODULE_AUTHOR("Chelsio Communications, Inc."); 41 MODULE_DESCRIPTION(DRV_MODULE_DESC); 42 MODULE_VERSION(DRV_MODULE_VERSION); 43 MODULE_LICENSE("GPL"); 44 45 module_param(dbg_level, uint, 0644); 46 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)"); 47 48 49 /* 50 * cxgbi device management 51 * maintains a list of the cxgbi devices 52 */ 53 static LIST_HEAD(cdev_list); 54 static DEFINE_MUTEX(cdev_mutex); 55 56 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base, 57 unsigned int max_conn) 58 { 59 struct cxgbi_ports_map *pmap = &cdev->pmap; 60 61 pmap->port_csk = cxgbi_alloc_big_mem(max_conn * 62 sizeof(struct cxgbi_sock *), 63 GFP_KERNEL); 64 if (!pmap->port_csk) { 65 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn); 66 return -ENOMEM; 67 } 68 69 pmap->max_connect = max_conn; 70 pmap->sport_base = base; 71 spin_lock_init(&pmap->lock); 72 return 0; 73 } 74 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create); 75 76 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev) 77 { 78 struct cxgbi_ports_map *pmap = &cdev->pmap; 79 struct cxgbi_sock *csk; 80 int i; 81 82 for (i = 0; i < pmap->max_connect; i++) { 83 if (pmap->port_csk[i]) { 84 csk = pmap->port_csk[i]; 85 pmap->port_csk[i] = NULL; 86 log_debug(1 << CXGBI_DBG_SOCK, 87 "csk 0x%p, cdev 0x%p, offload down.\n", 88 csk, cdev); 89 spin_lock_bh(&csk->lock); 90 cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN); 91 cxgbi_sock_closed(csk); 92 spin_unlock_bh(&csk->lock); 93 cxgbi_sock_put(csk); 94 } 95 } 96 } 97 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup); 98 99 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev) 100 { 101 log_debug(1 << CXGBI_DBG_DEV, 102 "cdev 0x%p, p# %u.\n", cdev, cdev->nports); 103 cxgbi_hbas_remove(cdev); 104 cxgbi_device_portmap_cleanup(cdev); 105 if (cdev->dev_ddp_cleanup) 106 cdev->dev_ddp_cleanup(cdev); 107 else 108 cxgbi_ddp_cleanup(cdev); 109 if (cdev->ddp) 110 cxgbi_ddp_cleanup(cdev); 111 if (cdev->pmap.max_connect) 112 cxgbi_free_big_mem(cdev->pmap.port_csk); 113 kfree(cdev); 114 } 115 116 struct cxgbi_device *cxgbi_device_register(unsigned int extra, 117 unsigned int nports) 118 { 119 struct cxgbi_device *cdev; 120 121 cdev = kzalloc(sizeof(*cdev) + extra + nports * 122 (sizeof(struct cxgbi_hba *) + 123 sizeof(struct net_device *)), 124 GFP_KERNEL); 125 if (!cdev) { 126 pr_warn("nport %d, OOM.\n", nports); 127 return NULL; 128 } 129 cdev->ports = (struct net_device **)(cdev + 1); 130 cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports * 131 sizeof(struct net_device *)); 132 if (extra) 133 cdev->dd_data = ((char *)cdev->hbas) + 134 nports * sizeof(struct cxgbi_hba *); 135 spin_lock_init(&cdev->pmap.lock); 136 137 mutex_lock(&cdev_mutex); 138 list_add_tail(&cdev->list_head, &cdev_list); 139 mutex_unlock(&cdev_mutex); 140 141 log_debug(1 << CXGBI_DBG_DEV, 142 "cdev 0x%p, p# %u.\n", cdev, nports); 143 return cdev; 144 } 145 EXPORT_SYMBOL_GPL(cxgbi_device_register); 146 147 void cxgbi_device_unregister(struct cxgbi_device *cdev) 148 { 149 log_debug(1 << CXGBI_DBG_DEV, 150 "cdev 0x%p, p# %u,%s.\n", 151 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : ""); 152 mutex_lock(&cdev_mutex); 153 list_del(&cdev->list_head); 154 mutex_unlock(&cdev_mutex); 155 cxgbi_device_destroy(cdev); 156 } 157 EXPORT_SYMBOL_GPL(cxgbi_device_unregister); 158 159 void cxgbi_device_unregister_all(unsigned int flag) 160 { 161 struct cxgbi_device *cdev, *tmp; 162 163 mutex_lock(&cdev_mutex); 164 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) { 165 if ((cdev->flags & flag) == flag) { 166 log_debug(1 << CXGBI_DBG_DEV, 167 "cdev 0x%p, p# %u,%s.\n", 168 cdev, cdev->nports, cdev->nports ? 169 cdev->ports[0]->name : ""); 170 list_del(&cdev->list_head); 171 cxgbi_device_destroy(cdev); 172 } 173 } 174 mutex_unlock(&cdev_mutex); 175 } 176 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all); 177 178 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev) 179 { 180 struct cxgbi_device *cdev, *tmp; 181 182 mutex_lock(&cdev_mutex); 183 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) { 184 if (cdev->lldev == lldev) { 185 mutex_unlock(&cdev_mutex); 186 return cdev; 187 } 188 } 189 mutex_unlock(&cdev_mutex); 190 log_debug(1 << CXGBI_DBG_DEV, 191 "lldev 0x%p, NO match found.\n", lldev); 192 return NULL; 193 } 194 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev); 195 196 static struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev, 197 int *port) 198 { 199 struct net_device *vdev = NULL; 200 struct cxgbi_device *cdev, *tmp; 201 int i; 202 203 if (ndev->priv_flags & IFF_802_1Q_VLAN) { 204 vdev = ndev; 205 ndev = vlan_dev_real_dev(ndev); 206 log_debug(1 << CXGBI_DBG_DEV, 207 "vlan dev %s -> %s.\n", vdev->name, ndev->name); 208 } 209 210 mutex_lock(&cdev_mutex); 211 list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) { 212 for (i = 0; i < cdev->nports; i++) { 213 if (ndev == cdev->ports[i]) { 214 cdev->hbas[i]->vdev = vdev; 215 mutex_unlock(&cdev_mutex); 216 if (port) 217 *port = i; 218 return cdev; 219 } 220 } 221 } 222 mutex_unlock(&cdev_mutex); 223 log_debug(1 << CXGBI_DBG_DEV, 224 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name); 225 return NULL; 226 } 227 228 void cxgbi_hbas_remove(struct cxgbi_device *cdev) 229 { 230 int i; 231 struct cxgbi_hba *chba; 232 233 log_debug(1 << CXGBI_DBG_DEV, 234 "cdev 0x%p, p#%u.\n", cdev, cdev->nports); 235 236 for (i = 0; i < cdev->nports; i++) { 237 chba = cdev->hbas[i]; 238 if (chba) { 239 cdev->hbas[i] = NULL; 240 iscsi_host_remove(chba->shost); 241 pci_dev_put(cdev->pdev); 242 iscsi_host_free(chba->shost); 243 } 244 } 245 } 246 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove); 247 248 int cxgbi_hbas_add(struct cxgbi_device *cdev, unsigned int max_lun, 249 unsigned int max_id, struct scsi_host_template *sht, 250 struct scsi_transport_template *stt) 251 { 252 struct cxgbi_hba *chba; 253 struct Scsi_Host *shost; 254 int i, err; 255 256 log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports); 257 258 for (i = 0; i < cdev->nports; i++) { 259 shost = iscsi_host_alloc(sht, sizeof(*chba), 1); 260 if (!shost) { 261 pr_info("0x%p, p%d, %s, host alloc failed.\n", 262 cdev, i, cdev->ports[i]->name); 263 err = -ENOMEM; 264 goto err_out; 265 } 266 267 shost->transportt = stt; 268 shost->max_lun = max_lun; 269 shost->max_id = max_id; 270 shost->max_channel = 0; 271 shost->max_cmd_len = 16; 272 273 chba = iscsi_host_priv(shost); 274 chba->cdev = cdev; 275 chba->ndev = cdev->ports[i]; 276 chba->shost = shost; 277 278 log_debug(1 << CXGBI_DBG_DEV, 279 "cdev 0x%p, p#%d %s: chba 0x%p.\n", 280 cdev, i, cdev->ports[i]->name, chba); 281 282 pci_dev_get(cdev->pdev); 283 err = iscsi_host_add(shost, &cdev->pdev->dev); 284 if (err) { 285 pr_info("cdev 0x%p, p#%d %s, host add failed.\n", 286 cdev, i, cdev->ports[i]->name); 287 pci_dev_put(cdev->pdev); 288 scsi_host_put(shost); 289 goto err_out; 290 } 291 292 cdev->hbas[i] = chba; 293 } 294 295 return 0; 296 297 err_out: 298 cxgbi_hbas_remove(cdev); 299 return err; 300 } 301 EXPORT_SYMBOL_GPL(cxgbi_hbas_add); 302 303 /* 304 * iSCSI offload 305 * 306 * - source port management 307 * To find a free source port in the port allocation map we use a very simple 308 * rotor scheme to look for the next free port. 309 * 310 * If a source port has been specified make sure that it doesn't collide with 311 * our normal source port allocation map. If it's outside the range of our 312 * allocation/deallocation scheme just let them use it. 313 * 314 * If the source port is outside our allocation range, the caller is 315 * responsible for keeping track of their port usage. 316 */ 317 static int sock_get_port(struct cxgbi_sock *csk) 318 { 319 struct cxgbi_device *cdev = csk->cdev; 320 struct cxgbi_ports_map *pmap = &cdev->pmap; 321 unsigned int start; 322 int idx; 323 324 if (!pmap->max_connect) { 325 pr_err("cdev 0x%p, p#%u %s, NO port map.\n", 326 cdev, csk->port_id, cdev->ports[csk->port_id]->name); 327 return -EADDRNOTAVAIL; 328 } 329 330 if (csk->saddr.sin_port) { 331 pr_err("source port NON-ZERO %u.\n", 332 ntohs(csk->saddr.sin_port)); 333 return -EADDRINUSE; 334 } 335 336 spin_lock_bh(&pmap->lock); 337 if (pmap->used >= pmap->max_connect) { 338 spin_unlock_bh(&pmap->lock); 339 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n", 340 cdev, csk->port_id, cdev->ports[csk->port_id]->name); 341 return -EADDRNOTAVAIL; 342 } 343 344 start = idx = pmap->next; 345 do { 346 if (++idx >= pmap->max_connect) 347 idx = 0; 348 if (!pmap->port_csk[idx]) { 349 pmap->used++; 350 csk->saddr.sin_port = 351 htons(pmap->sport_base + idx); 352 pmap->next = idx; 353 pmap->port_csk[idx] = csk; 354 spin_unlock_bh(&pmap->lock); 355 cxgbi_sock_get(csk); 356 log_debug(1 << CXGBI_DBG_SOCK, 357 "cdev 0x%p, p#%u %s, p %u, %u.\n", 358 cdev, csk->port_id, 359 cdev->ports[csk->port_id]->name, 360 pmap->sport_base + idx, pmap->next); 361 return 0; 362 } 363 } while (idx != start); 364 spin_unlock_bh(&pmap->lock); 365 366 /* should not happen */ 367 pr_warn("cdev 0x%p, p#%u %s, next %u?\n", 368 cdev, csk->port_id, cdev->ports[csk->port_id]->name, 369 pmap->next); 370 return -EADDRNOTAVAIL; 371 } 372 373 static void sock_put_port(struct cxgbi_sock *csk) 374 { 375 struct cxgbi_device *cdev = csk->cdev; 376 struct cxgbi_ports_map *pmap = &cdev->pmap; 377 378 if (csk->saddr.sin_port) { 379 int idx = ntohs(csk->saddr.sin_port) - pmap->sport_base; 380 381 csk->saddr.sin_port = 0; 382 if (idx < 0 || idx >= pmap->max_connect) { 383 pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n", 384 cdev, csk->port_id, 385 cdev->ports[csk->port_id]->name, 386 ntohs(csk->saddr.sin_port)); 387 return; 388 } 389 390 spin_lock_bh(&pmap->lock); 391 pmap->port_csk[idx] = NULL; 392 pmap->used--; 393 spin_unlock_bh(&pmap->lock); 394 395 log_debug(1 << CXGBI_DBG_SOCK, 396 "cdev 0x%p, p#%u %s, release %u.\n", 397 cdev, csk->port_id, cdev->ports[csk->port_id]->name, 398 pmap->sport_base + idx); 399 400 cxgbi_sock_put(csk); 401 } 402 } 403 404 /* 405 * iscsi tcp connection 406 */ 407 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk) 408 { 409 if (csk->cpl_close) { 410 kfree_skb(csk->cpl_close); 411 csk->cpl_close = NULL; 412 } 413 if (csk->cpl_abort_req) { 414 kfree_skb(csk->cpl_abort_req); 415 csk->cpl_abort_req = NULL; 416 } 417 if (csk->cpl_abort_rpl) { 418 kfree_skb(csk->cpl_abort_rpl); 419 csk->cpl_abort_rpl = NULL; 420 } 421 } 422 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs); 423 424 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev) 425 { 426 struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO); 427 428 if (!csk) { 429 pr_info("alloc csk %zu failed.\n", sizeof(*csk)); 430 return NULL; 431 } 432 433 if (cdev->csk_alloc_cpls(csk) < 0) { 434 pr_info("csk 0x%p, alloc cpls failed.\n", csk); 435 kfree(csk); 436 return NULL; 437 } 438 439 spin_lock_init(&csk->lock); 440 kref_init(&csk->refcnt); 441 skb_queue_head_init(&csk->receive_queue); 442 skb_queue_head_init(&csk->write_queue); 443 setup_timer(&csk->retry_timer, NULL, (unsigned long)csk); 444 rwlock_init(&csk->callback_lock); 445 csk->cdev = cdev; 446 csk->flags = 0; 447 cxgbi_sock_set_state(csk, CTP_CLOSED); 448 449 log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk); 450 451 return csk; 452 } 453 454 static struct rtable *find_route_ipv4(struct flowi4 *fl4, 455 __be32 saddr, __be32 daddr, 456 __be16 sport, __be16 dport, u8 tos) 457 { 458 struct rtable *rt; 459 460 rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr, 461 dport, sport, IPPROTO_TCP, tos, 0); 462 if (IS_ERR(rt)) 463 return NULL; 464 465 return rt; 466 } 467 468 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr) 469 { 470 struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr; 471 struct dst_entry *dst; 472 struct net_device *ndev; 473 struct cxgbi_device *cdev; 474 struct rtable *rt = NULL; 475 struct neighbour *n; 476 struct flowi4 fl4; 477 struct cxgbi_sock *csk = NULL; 478 unsigned int mtu = 0; 479 int port = 0xFFFF; 480 int err = 0; 481 482 if (daddr->sin_family != AF_INET) { 483 pr_info("address family 0x%x NOT supported.\n", 484 daddr->sin_family); 485 err = -EAFNOSUPPORT; 486 goto err_out; 487 } 488 489 rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0); 490 if (!rt) { 491 pr_info("no route to ipv4 0x%x, port %u.\n", 492 daddr->sin_addr.s_addr, daddr->sin_port); 493 err = -ENETUNREACH; 494 goto err_out; 495 } 496 dst = &rt->dst; 497 n = dst_get_neighbour_noref(dst); 498 if (!n) { 499 err = -ENODEV; 500 goto rel_rt; 501 } 502 ndev = n->dev; 503 504 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { 505 pr_info("multi-cast route %pI4, port %u, dev %s.\n", 506 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port), 507 ndev->name); 508 err = -ENETUNREACH; 509 goto rel_rt; 510 } 511 512 if (ndev->flags & IFF_LOOPBACK) { 513 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr); 514 mtu = ndev->mtu; 515 pr_info("rt dev %s, loopback -> %s, mtu %u.\n", 516 n->dev->name, ndev->name, mtu); 517 } 518 519 cdev = cxgbi_device_find_by_netdev(ndev, &port); 520 if (!cdev) { 521 pr_info("dst %pI4, %s, NOT cxgbi device.\n", 522 &daddr->sin_addr.s_addr, ndev->name); 523 err = -ENETUNREACH; 524 goto rel_rt; 525 } 526 log_debug(1 << CXGBI_DBG_SOCK, 527 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n", 528 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port), 529 port, ndev->name, cdev); 530 531 csk = cxgbi_sock_create(cdev); 532 if (!csk) { 533 err = -ENOMEM; 534 goto rel_rt; 535 } 536 csk->cdev = cdev; 537 csk->port_id = port; 538 csk->mtu = mtu; 539 csk->dst = dst; 540 csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr; 541 csk->daddr.sin_port = daddr->sin_port; 542 csk->daddr.sin_family = daddr->sin_family; 543 csk->saddr.sin_addr.s_addr = fl4.saddr; 544 545 return csk; 546 547 rel_rt: 548 ip_rt_put(rt); 549 if (csk) 550 cxgbi_sock_closed(csk); 551 err_out: 552 return ERR_PTR(err); 553 } 554 555 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn, 556 unsigned int opt) 557 { 558 csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn; 559 dst_confirm(csk->dst); 560 smp_mb(); 561 cxgbi_sock_set_state(csk, CTP_ESTABLISHED); 562 } 563 EXPORT_SYMBOL_GPL(cxgbi_sock_established); 564 565 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk) 566 { 567 log_debug(1 << CXGBI_DBG_SOCK, 568 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n", 569 csk, csk->state, csk->flags, csk->user_data); 570 571 if (csk->state != CTP_ESTABLISHED) { 572 read_lock_bh(&csk->callback_lock); 573 if (csk->user_data) 574 iscsi_conn_failure(csk->user_data, 575 ISCSI_ERR_CONN_FAILED); 576 read_unlock_bh(&csk->callback_lock); 577 } 578 } 579 580 void cxgbi_sock_closed(struct cxgbi_sock *csk) 581 { 582 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", 583 csk, (csk)->state, (csk)->flags, (csk)->tid); 584 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED); 585 if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED) 586 return; 587 if (csk->saddr.sin_port) 588 sock_put_port(csk); 589 if (csk->dst) 590 dst_release(csk->dst); 591 csk->cdev->csk_release_offload_resources(csk); 592 cxgbi_sock_set_state(csk, CTP_CLOSED); 593 cxgbi_inform_iscsi_conn_closing(csk); 594 cxgbi_sock_put(csk); 595 } 596 EXPORT_SYMBOL_GPL(cxgbi_sock_closed); 597 598 static void need_active_close(struct cxgbi_sock *csk) 599 { 600 int data_lost; 601 int close_req = 0; 602 603 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", 604 csk, (csk)->state, (csk)->flags, (csk)->tid); 605 spin_lock_bh(&csk->lock); 606 dst_confirm(csk->dst); 607 data_lost = skb_queue_len(&csk->receive_queue); 608 __skb_queue_purge(&csk->receive_queue); 609 610 if (csk->state == CTP_ACTIVE_OPEN) 611 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED); 612 else if (csk->state == CTP_ESTABLISHED) { 613 close_req = 1; 614 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE); 615 } else if (csk->state == CTP_PASSIVE_CLOSE) { 616 close_req = 1; 617 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2); 618 } 619 620 if (close_req) { 621 if (data_lost) 622 csk->cdev->csk_send_abort_req(csk); 623 else 624 csk->cdev->csk_send_close_req(csk); 625 } 626 627 spin_unlock_bh(&csk->lock); 628 } 629 630 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno) 631 { 632 pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n", 633 csk, csk->state, csk->flags, 634 &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port, 635 &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port, 636 errno); 637 638 cxgbi_sock_set_state(csk, CTP_CONNECTING); 639 csk->err = errno; 640 cxgbi_sock_closed(csk); 641 } 642 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open); 643 644 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb) 645 { 646 struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk; 647 648 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", 649 csk, (csk)->state, (csk)->flags, (csk)->tid); 650 cxgbi_sock_get(csk); 651 spin_lock_bh(&csk->lock); 652 if (csk->state == CTP_ACTIVE_OPEN) 653 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH); 654 spin_unlock_bh(&csk->lock); 655 cxgbi_sock_put(csk); 656 __kfree_skb(skb); 657 } 658 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure); 659 660 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk) 661 { 662 cxgbi_sock_get(csk); 663 spin_lock_bh(&csk->lock); 664 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) { 665 if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_RCVD)) 666 cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD); 667 else { 668 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_RCVD); 669 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING); 670 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) 671 pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n", 672 csk, csk->state, csk->flags, csk->tid); 673 cxgbi_sock_closed(csk); 674 } 675 } 676 spin_unlock_bh(&csk->lock); 677 cxgbi_sock_put(csk); 678 } 679 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl); 680 681 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk) 682 { 683 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", 684 csk, (csk)->state, (csk)->flags, (csk)->tid); 685 cxgbi_sock_get(csk); 686 spin_lock_bh(&csk->lock); 687 688 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) 689 goto done; 690 691 switch (csk->state) { 692 case CTP_ESTABLISHED: 693 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE); 694 break; 695 case CTP_ACTIVE_CLOSE: 696 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2); 697 break; 698 case CTP_CLOSE_WAIT_1: 699 cxgbi_sock_closed(csk); 700 break; 701 case CTP_ABORTING: 702 break; 703 default: 704 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n", 705 csk, csk->state, csk->flags, csk->tid); 706 } 707 cxgbi_inform_iscsi_conn_closing(csk); 708 done: 709 spin_unlock_bh(&csk->lock); 710 cxgbi_sock_put(csk); 711 } 712 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close); 713 714 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt) 715 { 716 log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n", 717 csk, (csk)->state, (csk)->flags, (csk)->tid); 718 cxgbi_sock_get(csk); 719 spin_lock_bh(&csk->lock); 720 721 csk->snd_una = snd_nxt - 1; 722 if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) 723 goto done; 724 725 switch (csk->state) { 726 case CTP_ACTIVE_CLOSE: 727 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1); 728 break; 729 case CTP_CLOSE_WAIT_1: 730 case CTP_CLOSE_WAIT_2: 731 cxgbi_sock_closed(csk); 732 break; 733 case CTP_ABORTING: 734 break; 735 default: 736 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n", 737 csk, csk->state, csk->flags, csk->tid); 738 } 739 done: 740 spin_unlock_bh(&csk->lock); 741 cxgbi_sock_put(csk); 742 } 743 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl); 744 745 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits, 746 unsigned int snd_una, int seq_chk) 747 { 748 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK, 749 "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n", 750 csk, csk->state, csk->flags, csk->tid, credits, 751 csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk); 752 753 spin_lock_bh(&csk->lock); 754 755 csk->wr_cred += credits; 756 if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred) 757 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred; 758 759 while (credits) { 760 struct sk_buff *p = cxgbi_sock_peek_wr(csk); 761 762 if (unlikely(!p)) { 763 pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n", 764 csk, csk->state, csk->flags, csk->tid, credits, 765 csk->wr_cred, csk->wr_una_cred); 766 break; 767 } 768 769 if (unlikely(credits < p->csum)) { 770 pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n", 771 csk, csk->state, csk->flags, csk->tid, 772 credits, csk->wr_cred, csk->wr_una_cred, 773 p->csum); 774 p->csum -= credits; 775 break; 776 } else { 777 cxgbi_sock_dequeue_wr(csk); 778 credits -= p->csum; 779 kfree_skb(p); 780 } 781 } 782 783 cxgbi_sock_check_wr_invariants(csk); 784 785 if (seq_chk) { 786 if (unlikely(before(snd_una, csk->snd_una))) { 787 pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.", 788 csk, csk->state, csk->flags, csk->tid, snd_una, 789 csk->snd_una); 790 goto done; 791 } 792 793 if (csk->snd_una != snd_una) { 794 csk->snd_una = snd_una; 795 dst_confirm(csk->dst); 796 } 797 } 798 799 if (skb_queue_len(&csk->write_queue)) { 800 if (csk->cdev->csk_push_tx_frames(csk, 0)) 801 cxgbi_conn_tx_open(csk); 802 } else 803 cxgbi_conn_tx_open(csk); 804 done: 805 spin_unlock_bh(&csk->lock); 806 } 807 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack); 808 809 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk, 810 unsigned short mtu) 811 { 812 int i = 0; 813 814 while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu) 815 ++i; 816 817 return i; 818 } 819 820 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu) 821 { 822 unsigned int idx; 823 struct dst_entry *dst = csk->dst; 824 825 csk->advmss = dst_metric_advmss(dst); 826 827 if (csk->advmss > pmtu - 40) 828 csk->advmss = pmtu - 40; 829 if (csk->advmss < csk->cdev->mtus[0] - 40) 830 csk->advmss = csk->cdev->mtus[0] - 40; 831 idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40); 832 833 return idx; 834 } 835 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss); 836 837 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb) 838 { 839 cxgbi_skcb_tcp_seq(skb) = csk->write_seq; 840 __skb_queue_tail(&csk->write_queue, skb); 841 } 842 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail); 843 844 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk) 845 { 846 struct sk_buff *skb; 847 848 while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL) 849 kfree_skb(skb); 850 } 851 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue); 852 853 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk) 854 { 855 int pending = cxgbi_sock_count_pending_wrs(csk); 856 857 if (unlikely(csk->wr_cred + pending != csk->wr_max_cred)) 858 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n", 859 csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred); 860 } 861 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants); 862 863 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb) 864 { 865 struct cxgbi_device *cdev = csk->cdev; 866 struct sk_buff *next; 867 int err, copied = 0; 868 869 spin_lock_bh(&csk->lock); 870 871 if (csk->state != CTP_ESTABLISHED) { 872 log_debug(1 << CXGBI_DBG_PDU_TX, 873 "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n", 874 csk, csk->state, csk->flags, csk->tid); 875 err = -EAGAIN; 876 goto out_err; 877 } 878 879 if (csk->err) { 880 log_debug(1 << CXGBI_DBG_PDU_TX, 881 "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n", 882 csk, csk->state, csk->flags, csk->tid, csk->err); 883 err = -EPIPE; 884 goto out_err; 885 } 886 887 if (csk->write_seq - csk->snd_una >= cdev->snd_win) { 888 log_debug(1 << CXGBI_DBG_PDU_TX, 889 "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n", 890 csk, csk->state, csk->flags, csk->tid, csk->write_seq, 891 csk->snd_una, cdev->snd_win); 892 err = -ENOBUFS; 893 goto out_err; 894 } 895 896 while (skb) { 897 int frags = skb_shinfo(skb)->nr_frags + 898 (skb->len != skb->data_len); 899 900 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) { 901 pr_err("csk 0x%p, skb head %u < %u.\n", 902 csk, skb_headroom(skb), cdev->skb_tx_rsvd); 903 err = -EINVAL; 904 goto out_err; 905 } 906 907 if (frags >= SKB_WR_LIST_SIZE) { 908 pr_err("csk 0x%p, frags %d, %u,%u >%u.\n", 909 csk, skb_shinfo(skb)->nr_frags, skb->len, 910 skb->data_len, (uint)(SKB_WR_LIST_SIZE)); 911 err = -EINVAL; 912 goto out_err; 913 } 914 915 next = skb->next; 916 skb->next = NULL; 917 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR); 918 cxgbi_sock_skb_entail(csk, skb); 919 copied += skb->len; 920 csk->write_seq += skb->len + 921 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb)); 922 skb = next; 923 } 924 done: 925 if (likely(skb_queue_len(&csk->write_queue))) 926 cdev->csk_push_tx_frames(csk, 1); 927 spin_unlock_bh(&csk->lock); 928 return copied; 929 930 out_err: 931 if (copied == 0 && err == -EPIPE) 932 copied = csk->err ? csk->err : -EPIPE; 933 else 934 copied = err; 935 goto done; 936 } 937 938 /* 939 * Direct Data Placement - 940 * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted 941 * final destination host-memory buffers based on the Initiator Task Tag (ITT) 942 * in Data-In or Target Task Tag (TTT) in Data-Out PDUs. 943 * The host memory address is programmed into h/w in the format of pagepod 944 * entries. 945 * The location of the pagepod entry is encoded into ddp tag which is used as 946 * the base for ITT/TTT. 947 */ 948 949 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4}; 950 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16}; 951 static unsigned char page_idx = DDP_PGIDX_MAX; 952 953 static unsigned char sw_tag_idx_bits; 954 static unsigned char sw_tag_age_bits; 955 956 /* 957 * Direct-Data Placement page size adjustment 958 */ 959 static int ddp_adjust_page_table(void) 960 { 961 int i; 962 unsigned int base_order, order; 963 964 if (PAGE_SIZE < (1UL << ddp_page_shift[0])) { 965 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n", 966 PAGE_SIZE, 1UL << ddp_page_shift[0]); 967 return -EINVAL; 968 } 969 970 base_order = get_order(1UL << ddp_page_shift[0]); 971 order = get_order(1UL << PAGE_SHIFT); 972 973 for (i = 0; i < DDP_PGIDX_MAX; i++) { 974 /* first is the kernel page size, then just doubling */ 975 ddp_page_order[i] = order - base_order + i; 976 ddp_page_shift[i] = PAGE_SHIFT + i; 977 } 978 return 0; 979 } 980 981 static int ddp_find_page_index(unsigned long pgsz) 982 { 983 int i; 984 985 for (i = 0; i < DDP_PGIDX_MAX; i++) { 986 if (pgsz == (1UL << ddp_page_shift[i])) 987 return i; 988 } 989 pr_info("ddp page size %lu not supported.\n", pgsz); 990 return DDP_PGIDX_MAX; 991 } 992 993 static void ddp_setup_host_page_size(void) 994 { 995 if (page_idx == DDP_PGIDX_MAX) { 996 page_idx = ddp_find_page_index(PAGE_SIZE); 997 998 if (page_idx == DDP_PGIDX_MAX) { 999 pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE); 1000 if (ddp_adjust_page_table() < 0) { 1001 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE); 1002 return; 1003 } 1004 page_idx = ddp_find_page_index(PAGE_SIZE); 1005 } 1006 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx); 1007 } 1008 } 1009 1010 void cxgbi_ddp_page_size_factor(int *pgsz_factor) 1011 { 1012 int i; 1013 1014 for (i = 0; i < DDP_PGIDX_MAX; i++) 1015 pgsz_factor[i] = ddp_page_order[i]; 1016 } 1017 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor); 1018 1019 /* 1020 * DDP setup & teardown 1021 */ 1022 1023 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod, 1024 struct cxgbi_pagepod_hdr *hdr, 1025 struct cxgbi_gather_list *gl, unsigned int gidx) 1026 { 1027 int i; 1028 1029 memcpy(ppod, hdr, sizeof(*hdr)); 1030 for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) { 1031 ppod->addr[i] = gidx < gl->nelem ? 1032 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL; 1033 } 1034 } 1035 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set); 1036 1037 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod) 1038 { 1039 memset(ppod, 0, sizeof(*ppod)); 1040 } 1041 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear); 1042 1043 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp, 1044 unsigned int start, unsigned int max, 1045 unsigned int count, 1046 struct cxgbi_gather_list *gl) 1047 { 1048 unsigned int i, j, k; 1049 1050 /* not enough entries */ 1051 if ((max - start) < count) { 1052 log_debug(1 << CXGBI_DBG_DDP, 1053 "NOT enough entries %u+%u < %u.\n", start, count, max); 1054 return -EBUSY; 1055 } 1056 1057 max -= count; 1058 spin_lock(&ddp->map_lock); 1059 for (i = start; i < max;) { 1060 for (j = 0, k = i; j < count; j++, k++) { 1061 if (ddp->gl_map[k]) 1062 break; 1063 } 1064 if (j == count) { 1065 for (j = 0, k = i; j < count; j++, k++) 1066 ddp->gl_map[k] = gl; 1067 spin_unlock(&ddp->map_lock); 1068 return i; 1069 } 1070 i += j + 1; 1071 } 1072 spin_unlock(&ddp->map_lock); 1073 log_debug(1 << CXGBI_DBG_DDP, 1074 "NO suitable entries %u available.\n", count); 1075 return -EBUSY; 1076 } 1077 1078 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp, 1079 int start, int count) 1080 { 1081 spin_lock(&ddp->map_lock); 1082 memset(&ddp->gl_map[start], 0, 1083 count * sizeof(struct cxgbi_gather_list *)); 1084 spin_unlock(&ddp->map_lock); 1085 } 1086 1087 static inline void ddp_gl_unmap(struct pci_dev *pdev, 1088 struct cxgbi_gather_list *gl) 1089 { 1090 int i; 1091 1092 for (i = 0; i < gl->nelem; i++) 1093 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE, 1094 PCI_DMA_FROMDEVICE); 1095 } 1096 1097 static inline int ddp_gl_map(struct pci_dev *pdev, 1098 struct cxgbi_gather_list *gl) 1099 { 1100 int i; 1101 1102 for (i = 0; i < gl->nelem; i++) { 1103 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0, 1104 PAGE_SIZE, 1105 PCI_DMA_FROMDEVICE); 1106 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) { 1107 log_debug(1 << CXGBI_DBG_DDP, 1108 "page %d 0x%p, 0x%p dma mapping err.\n", 1109 i, gl->pages[i], pdev); 1110 goto unmap; 1111 } 1112 } 1113 return i; 1114 unmap: 1115 if (i) { 1116 unsigned int nelem = gl->nelem; 1117 1118 gl->nelem = i; 1119 ddp_gl_unmap(pdev, gl); 1120 gl->nelem = nelem; 1121 } 1122 return -EINVAL; 1123 } 1124 1125 static void ddp_release_gl(struct cxgbi_gather_list *gl, 1126 struct pci_dev *pdev) 1127 { 1128 ddp_gl_unmap(pdev, gl); 1129 kfree(gl); 1130 } 1131 1132 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen, 1133 struct scatterlist *sgl, 1134 unsigned int sgcnt, 1135 struct pci_dev *pdev, 1136 gfp_t gfp) 1137 { 1138 struct cxgbi_gather_list *gl; 1139 struct scatterlist *sg = sgl; 1140 struct page *sgpage = sg_page(sg); 1141 unsigned int sglen = sg->length; 1142 unsigned int sgoffset = sg->offset; 1143 unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >> 1144 PAGE_SHIFT; 1145 int i = 1, j = 0; 1146 1147 if (xferlen < DDP_THRESHOLD) { 1148 log_debug(1 << CXGBI_DBG_DDP, 1149 "xfer %u < threshold %u, no ddp.\n", 1150 xferlen, DDP_THRESHOLD); 1151 return NULL; 1152 } 1153 1154 gl = kzalloc(sizeof(struct cxgbi_gather_list) + 1155 npages * (sizeof(dma_addr_t) + 1156 sizeof(struct page *)), gfp); 1157 if (!gl) { 1158 log_debug(1 << CXGBI_DBG_DDP, 1159 "xfer %u, %u pages, OOM.\n", xferlen, npages); 1160 return NULL; 1161 } 1162 1163 log_debug(1 << CXGBI_DBG_DDP, 1164 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages); 1165 1166 gl->pages = (struct page **)&gl->phys_addr[npages]; 1167 gl->nelem = npages; 1168 gl->length = xferlen; 1169 gl->offset = sgoffset; 1170 gl->pages[0] = sgpage; 1171 1172 for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt; 1173 i++, sg = sg_next(sg)) { 1174 struct page *page = sg_page(sg); 1175 1176 if (sgpage == page && sg->offset == sgoffset + sglen) 1177 sglen += sg->length; 1178 else { 1179 /* make sure the sgl is fit for ddp: 1180 * each has the same page size, and 1181 * all of the middle pages are used completely 1182 */ 1183 if ((j && sgoffset) || ((i != sgcnt - 1) && 1184 ((sglen + sgoffset) & ~PAGE_MASK))) { 1185 log_debug(1 << CXGBI_DBG_DDP, 1186 "page %d/%u, %u + %u.\n", 1187 i, sgcnt, sgoffset, sglen); 1188 goto error_out; 1189 } 1190 1191 j++; 1192 if (j == gl->nelem || sg->offset) { 1193 log_debug(1 << CXGBI_DBG_DDP, 1194 "page %d/%u, offset %u.\n", 1195 j, gl->nelem, sg->offset); 1196 goto error_out; 1197 } 1198 gl->pages[j] = page; 1199 sglen = sg->length; 1200 sgoffset = sg->offset; 1201 sgpage = page; 1202 } 1203 } 1204 gl->nelem = ++j; 1205 1206 if (ddp_gl_map(pdev, gl) < 0) 1207 goto error_out; 1208 1209 return gl; 1210 1211 error_out: 1212 kfree(gl); 1213 return NULL; 1214 } 1215 1216 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag) 1217 { 1218 struct cxgbi_device *cdev = chba->cdev; 1219 struct cxgbi_ddp_info *ddp = cdev->ddp; 1220 u32 idx; 1221 1222 idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask; 1223 if (idx < ddp->nppods) { 1224 struct cxgbi_gather_list *gl = ddp->gl_map[idx]; 1225 unsigned int npods; 1226 1227 if (!gl || !gl->nelem) { 1228 pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n", 1229 tag, idx, gl, gl ? gl->nelem : 0); 1230 return; 1231 } 1232 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT; 1233 log_debug(1 << CXGBI_DBG_DDP, 1234 "tag 0x%x, release idx %u, npods %u.\n", 1235 tag, idx, npods); 1236 cdev->csk_ddp_clear(chba, tag, idx, npods); 1237 ddp_unmark_entries(ddp, idx, npods); 1238 ddp_release_gl(gl, ddp->pdev); 1239 } else 1240 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods); 1241 } 1242 1243 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid, 1244 u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl, 1245 gfp_t gfp) 1246 { 1247 struct cxgbi_device *cdev = csk->cdev; 1248 struct cxgbi_ddp_info *ddp = cdev->ddp; 1249 struct cxgbi_tag_format *tformat = &cdev->tag_format; 1250 struct cxgbi_pagepod_hdr hdr; 1251 unsigned int npods; 1252 int idx = -1; 1253 int err = -ENOMEM; 1254 u32 tag; 1255 1256 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT; 1257 if (ddp->idx_last == ddp->nppods) 1258 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods, 1259 npods, gl); 1260 else { 1261 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1, 1262 ddp->nppods, npods, 1263 gl); 1264 if (idx < 0 && ddp->idx_last >= npods) { 1265 idx = ddp_find_unused_entries(ddp, 0, 1266 min(ddp->idx_last + npods, ddp->nppods), 1267 npods, gl); 1268 } 1269 } 1270 if (idx < 0) { 1271 log_debug(1 << CXGBI_DBG_DDP, 1272 "xferlen %u, gl %u, npods %u NO DDP.\n", 1273 gl->length, gl->nelem, npods); 1274 return idx; 1275 } 1276 1277 tag = cxgbi_ddp_tag_base(tformat, sw_tag); 1278 tag |= idx << PPOD_IDX_SHIFT; 1279 1280 hdr.rsvd = 0; 1281 hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid)); 1282 hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask); 1283 hdr.max_offset = htonl(gl->length); 1284 hdr.page_offset = htonl(gl->offset); 1285 1286 err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl); 1287 if (err < 0) 1288 goto unmark_entries; 1289 1290 ddp->idx_last = idx; 1291 log_debug(1 << CXGBI_DBG_DDP, 1292 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n", 1293 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx, 1294 npods); 1295 *tagp = tag; 1296 return 0; 1297 1298 unmark_entries: 1299 ddp_unmark_entries(ddp, idx, npods); 1300 return err; 1301 } 1302 1303 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp, 1304 unsigned int sw_tag, unsigned int xferlen, 1305 struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp) 1306 { 1307 struct cxgbi_device *cdev = csk->cdev; 1308 struct cxgbi_tag_format *tformat = &cdev->tag_format; 1309 struct cxgbi_gather_list *gl; 1310 int err; 1311 1312 if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp || 1313 xferlen < DDP_THRESHOLD) { 1314 log_debug(1 << CXGBI_DBG_DDP, 1315 "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen); 1316 return -EINVAL; 1317 } 1318 1319 if (!cxgbi_sw_tag_usable(tformat, sw_tag)) { 1320 log_debug(1 << CXGBI_DBG_DDP, 1321 "sw_tag 0x%x NOT usable.\n", sw_tag); 1322 return -EINVAL; 1323 } 1324 1325 gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp); 1326 if (!gl) 1327 return -ENOMEM; 1328 1329 err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp); 1330 if (err < 0) 1331 ddp_release_gl(gl, cdev->pdev); 1332 1333 return err; 1334 } 1335 1336 static void ddp_destroy(struct kref *kref) 1337 { 1338 struct cxgbi_ddp_info *ddp = container_of(kref, 1339 struct cxgbi_ddp_info, 1340 refcnt); 1341 struct cxgbi_device *cdev = ddp->cdev; 1342 int i = 0; 1343 1344 pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev); 1345 1346 while (i < ddp->nppods) { 1347 struct cxgbi_gather_list *gl = ddp->gl_map[i]; 1348 1349 if (gl) { 1350 int npods = (gl->nelem + PPOD_PAGES_MAX - 1) 1351 >> PPOD_PAGES_SHIFT; 1352 pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods); 1353 kfree(gl); 1354 i += npods; 1355 } else 1356 i++; 1357 } 1358 cxgbi_free_big_mem(ddp); 1359 } 1360 1361 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev) 1362 { 1363 struct cxgbi_ddp_info *ddp = cdev->ddp; 1364 1365 log_debug(1 << CXGBI_DBG_DDP, 1366 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp); 1367 cdev->ddp = NULL; 1368 if (ddp) 1369 return kref_put(&ddp->refcnt, ddp_destroy); 1370 return 0; 1371 } 1372 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup); 1373 1374 int cxgbi_ddp_init(struct cxgbi_device *cdev, 1375 unsigned int llimit, unsigned int ulimit, 1376 unsigned int max_txsz, unsigned int max_rxsz) 1377 { 1378 struct cxgbi_ddp_info *ddp; 1379 unsigned int ppmax, bits; 1380 1381 ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT; 1382 bits = __ilog2_u32(ppmax) + 1; 1383 if (bits > PPOD_IDX_MAX_SIZE) 1384 bits = PPOD_IDX_MAX_SIZE; 1385 ppmax = (1 << (bits - 1)) - 1; 1386 1387 ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) + 1388 ppmax * (sizeof(struct cxgbi_gather_list *) + 1389 sizeof(struct sk_buff *)), 1390 GFP_KERNEL); 1391 if (!ddp) { 1392 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax); 1393 return -ENOMEM; 1394 } 1395 ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1); 1396 cdev->ddp = ddp; 1397 1398 spin_lock_init(&ddp->map_lock); 1399 kref_init(&ddp->refcnt); 1400 1401 ddp->cdev = cdev; 1402 ddp->pdev = cdev->pdev; 1403 ddp->llimit = llimit; 1404 ddp->ulimit = ulimit; 1405 ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE); 1406 ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE); 1407 ddp->nppods = ppmax; 1408 ddp->idx_last = ppmax; 1409 ddp->idx_bits = bits; 1410 ddp->idx_mask = (1 << bits) - 1; 1411 ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1; 1412 1413 cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits; 1414 cdev->tag_format.rsvd_bits = ddp->idx_bits; 1415 cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT; 1416 cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1; 1417 1418 pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n", 1419 cdev->ports[0]->name, cdev->tag_format.sw_bits, 1420 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift, 1421 cdev->tag_format.rsvd_mask); 1422 1423 cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD, 1424 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN); 1425 cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD, 1426 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN); 1427 1428 log_debug(1 << CXGBI_DBG_DDP, 1429 "%s max payload size: %u/%u, %u/%u.\n", 1430 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz, 1431 cdev->rx_max_size, ddp->max_rxsz); 1432 return 0; 1433 } 1434 EXPORT_SYMBOL_GPL(cxgbi_ddp_init); 1435 1436 /* 1437 * APIs interacting with open-iscsi libraries 1438 */ 1439 1440 static unsigned char padding[4]; 1441 1442 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt) 1443 { 1444 struct scsi_cmnd *sc = task->sc; 1445 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data; 1446 struct cxgbi_conn *cconn = tcp_conn->dd_data; 1447 struct cxgbi_hba *chba = cconn->chba; 1448 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format; 1449 u32 tag = ntohl((__force u32)hdr_itt); 1450 1451 log_debug(1 << CXGBI_DBG_DDP, 1452 "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag); 1453 if (sc && 1454 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) && 1455 cxgbi_is_ddp_tag(tformat, tag)) 1456 ddp_tag_release(chba, tag); 1457 } 1458 1459 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt) 1460 { 1461 struct scsi_cmnd *sc = task->sc; 1462 struct iscsi_conn *conn = task->conn; 1463 struct iscsi_session *sess = conn->session; 1464 struct iscsi_tcp_conn *tcp_conn = conn->dd_data; 1465 struct cxgbi_conn *cconn = tcp_conn->dd_data; 1466 struct cxgbi_hba *chba = cconn->chba; 1467 struct cxgbi_tag_format *tformat = &chba->cdev->tag_format; 1468 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt; 1469 u32 tag = 0; 1470 int err = -EINVAL; 1471 1472 if (sc && 1473 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) { 1474 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag, 1475 scsi_in(sc)->length, 1476 scsi_in(sc)->table.sgl, 1477 scsi_in(sc)->table.nents, 1478 GFP_ATOMIC); 1479 if (err < 0) 1480 log_debug(1 << CXGBI_DBG_DDP, 1481 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n", 1482 cconn->cep->csk, task, scsi_in(sc)->length, 1483 scsi_in(sc)->table.nents); 1484 } 1485 1486 if (err < 0) 1487 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag); 1488 /* the itt need to sent in big-endian order */ 1489 *hdr_itt = (__force itt_t)htonl(tag); 1490 1491 log_debug(1 << CXGBI_DBG_DDP, 1492 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n", 1493 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt); 1494 return 0; 1495 } 1496 1497 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age) 1498 { 1499 struct iscsi_tcp_conn *tcp_conn = conn->dd_data; 1500 struct cxgbi_conn *cconn = tcp_conn->dd_data; 1501 struct cxgbi_device *cdev = cconn->chba->cdev; 1502 u32 tag = ntohl((__force u32) itt); 1503 u32 sw_bits; 1504 1505 sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag); 1506 if (idx) 1507 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1); 1508 if (age) 1509 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK; 1510 1511 log_debug(1 << CXGBI_DBG_DDP, 1512 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n", 1513 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF, 1514 age ? *age : 0xFF); 1515 } 1516 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt); 1517 1518 void cxgbi_conn_tx_open(struct cxgbi_sock *csk) 1519 { 1520 struct iscsi_conn *conn = csk->user_data; 1521 1522 if (conn) { 1523 log_debug(1 << CXGBI_DBG_SOCK, 1524 "csk 0x%p, cid %d.\n", csk, conn->id); 1525 iscsi_conn_queue_work(conn); 1526 } 1527 } 1528 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open); 1529 1530 /* 1531 * pdu receive, interact with libiscsi_tcp 1532 */ 1533 static inline int read_pdu_skb(struct iscsi_conn *conn, 1534 struct sk_buff *skb, 1535 unsigned int offset, 1536 int offloaded) 1537 { 1538 int status = 0; 1539 int bytes_read; 1540 1541 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status); 1542 switch (status) { 1543 case ISCSI_TCP_CONN_ERR: 1544 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n", 1545 skb, offset, offloaded); 1546 return -EIO; 1547 case ISCSI_TCP_SUSPENDED: 1548 log_debug(1 << CXGBI_DBG_PDU_RX, 1549 "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n", 1550 skb, offset, offloaded, bytes_read); 1551 /* no transfer - just have caller flush queue */ 1552 return bytes_read; 1553 case ISCSI_TCP_SKB_DONE: 1554 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n", 1555 skb, offset, offloaded); 1556 /* 1557 * pdus should always fit in the skb and we should get 1558 * segment done notifcation. 1559 */ 1560 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb."); 1561 return -EFAULT; 1562 case ISCSI_TCP_SEGMENT_DONE: 1563 log_debug(1 << CXGBI_DBG_PDU_RX, 1564 "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n", 1565 skb, offset, offloaded, bytes_read); 1566 return bytes_read; 1567 default: 1568 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n", 1569 skb, offset, offloaded, status); 1570 return -EINVAL; 1571 } 1572 } 1573 1574 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb) 1575 { 1576 struct iscsi_tcp_conn *tcp_conn = conn->dd_data; 1577 1578 log_debug(1 << CXGBI_DBG_PDU_RX, 1579 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n", 1580 conn, skb, skb->len, cxgbi_skcb_flags(skb)); 1581 1582 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) { 1583 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb); 1584 iscsi_conn_failure(conn, ISCSI_ERR_PROTO); 1585 return -EIO; 1586 } 1587 1588 if (conn->hdrdgst_en && 1589 cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) { 1590 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb); 1591 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST); 1592 return -EIO; 1593 } 1594 1595 return read_pdu_skb(conn, skb, 0, 0); 1596 } 1597 1598 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb, 1599 struct sk_buff *skb, unsigned int offset) 1600 { 1601 struct iscsi_tcp_conn *tcp_conn = conn->dd_data; 1602 bool offloaded = 0; 1603 int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; 1604 1605 log_debug(1 << CXGBI_DBG_PDU_RX, 1606 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n", 1607 conn, skb, skb->len, cxgbi_skcb_flags(skb)); 1608 1609 if (conn->datadgst_en && 1610 cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) { 1611 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n", 1612 conn, lskb, cxgbi_skcb_flags(lskb)); 1613 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); 1614 return -EIO; 1615 } 1616 1617 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn)) 1618 return 0; 1619 1620 /* coalesced, add header digest length */ 1621 if (lskb == skb && conn->hdrdgst_en) 1622 offset += ISCSI_DIGEST_SIZE; 1623 1624 if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD)) 1625 offloaded = 1; 1626 1627 if (opcode == ISCSI_OP_SCSI_DATA_IN) 1628 log_debug(1 << CXGBI_DBG_PDU_RX, 1629 "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n", 1630 skb, opcode, ntohl(tcp_conn->in.hdr->itt), 1631 tcp_conn->in.datalen, offloaded ? "is" : "not"); 1632 1633 return read_pdu_skb(conn, skb, offset, offloaded); 1634 } 1635 1636 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied) 1637 { 1638 struct cxgbi_device *cdev = csk->cdev; 1639 int must_send; 1640 u32 credits; 1641 1642 log_debug(1 << CXGBI_DBG_PDU_RX, 1643 "csk 0x%p,%u,0x%lu,%u, seq %u, wup %u, thre %u, %u.\n", 1644 csk, csk->state, csk->flags, csk->tid, csk->copied_seq, 1645 csk->rcv_wup, cdev->rx_credit_thres, 1646 cdev->rcv_win); 1647 1648 if (csk->state != CTP_ESTABLISHED) 1649 return; 1650 1651 credits = csk->copied_seq - csk->rcv_wup; 1652 if (unlikely(!credits)) 1653 return; 1654 if (unlikely(cdev->rx_credit_thres == 0)) 1655 return; 1656 1657 must_send = credits + 16384 >= cdev->rcv_win; 1658 if (must_send || credits >= cdev->rx_credit_thres) 1659 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits); 1660 } 1661 1662 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk) 1663 { 1664 struct cxgbi_device *cdev = csk->cdev; 1665 struct iscsi_conn *conn = csk->user_data; 1666 struct sk_buff *skb; 1667 unsigned int read = 0; 1668 int err = 0; 1669 1670 log_debug(1 << CXGBI_DBG_PDU_RX, 1671 "csk 0x%p, conn 0x%p.\n", csk, conn); 1672 1673 if (unlikely(!conn || conn->suspend_rx)) { 1674 log_debug(1 << CXGBI_DBG_PDU_RX, 1675 "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n", 1676 csk, conn, conn ? conn->id : 0xFF, 1677 conn ? conn->suspend_rx : 0xFF); 1678 return; 1679 } 1680 1681 while (!err) { 1682 skb = skb_peek(&csk->receive_queue); 1683 if (!skb || 1684 !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) { 1685 if (skb) 1686 log_debug(1 << CXGBI_DBG_PDU_RX, 1687 "skb 0x%p, NOT ready 0x%lx.\n", 1688 skb, cxgbi_skcb_flags(skb)); 1689 break; 1690 } 1691 __skb_unlink(skb, &csk->receive_queue); 1692 1693 read += cxgbi_skcb_rx_pdulen(skb); 1694 log_debug(1 << CXGBI_DBG_PDU_RX, 1695 "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n", 1696 csk, skb, skb->len, cxgbi_skcb_flags(skb), 1697 cxgbi_skcb_rx_pdulen(skb)); 1698 1699 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) { 1700 err = skb_read_pdu_bhs(conn, skb); 1701 if (err < 0) { 1702 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, " 1703 "f 0x%lx, plen %u.\n", 1704 csk, skb, skb->len, 1705 cxgbi_skcb_flags(skb), 1706 cxgbi_skcb_rx_pdulen(skb)); 1707 goto skb_done; 1708 } 1709 err = skb_read_pdu_data(conn, skb, skb, 1710 err + cdev->skb_rx_extra); 1711 if (err < 0) 1712 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, " 1713 "f 0x%lx, plen %u.\n", 1714 csk, skb, skb->len, 1715 cxgbi_skcb_flags(skb), 1716 cxgbi_skcb_rx_pdulen(skb)); 1717 } else { 1718 err = skb_read_pdu_bhs(conn, skb); 1719 if (err < 0) { 1720 pr_err("bhs, csk 0x%p, skb 0x%p,%u, " 1721 "f 0x%lx, plen %u.\n", 1722 csk, skb, skb->len, 1723 cxgbi_skcb_flags(skb), 1724 cxgbi_skcb_rx_pdulen(skb)); 1725 goto skb_done; 1726 } 1727 1728 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) { 1729 struct sk_buff *dskb; 1730 1731 dskb = skb_peek(&csk->receive_queue); 1732 if (!dskb) { 1733 pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx," 1734 " plen %u, NO data.\n", 1735 csk, skb, skb->len, 1736 cxgbi_skcb_flags(skb), 1737 cxgbi_skcb_rx_pdulen(skb)); 1738 err = -EIO; 1739 goto skb_done; 1740 } 1741 __skb_unlink(dskb, &csk->receive_queue); 1742 1743 err = skb_read_pdu_data(conn, skb, dskb, 0); 1744 if (err < 0) 1745 pr_err("data, csk 0x%p, skb 0x%p,%u, " 1746 "f 0x%lx, plen %u, dskb 0x%p," 1747 "%u.\n", 1748 csk, skb, skb->len, 1749 cxgbi_skcb_flags(skb), 1750 cxgbi_skcb_rx_pdulen(skb), 1751 dskb, dskb->len); 1752 __kfree_skb(dskb); 1753 } else 1754 err = skb_read_pdu_data(conn, skb, skb, 0); 1755 } 1756 skb_done: 1757 __kfree_skb(skb); 1758 1759 if (err < 0) 1760 break; 1761 } 1762 1763 log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read); 1764 if (read) { 1765 csk->copied_seq += read; 1766 csk_return_rx_credits(csk, read); 1767 conn->rxdata_octets += read; 1768 } 1769 1770 if (err < 0) { 1771 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n", 1772 csk, conn, err, read); 1773 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 1774 } 1775 } 1776 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready); 1777 1778 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt, 1779 unsigned int offset, unsigned int *off, 1780 struct scatterlist **sgp) 1781 { 1782 int i; 1783 struct scatterlist *sg; 1784 1785 for_each_sg(sgl, sg, sgcnt, i) { 1786 if (offset < sg->length) { 1787 *off = offset; 1788 *sgp = sg; 1789 return 0; 1790 } 1791 offset -= sg->length; 1792 } 1793 return -EFAULT; 1794 } 1795 1796 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset, 1797 unsigned int dlen, struct page_frag *frags, 1798 int frag_max) 1799 { 1800 unsigned int datalen = dlen; 1801 unsigned int sglen = sg->length - sgoffset; 1802 struct page *page = sg_page(sg); 1803 int i; 1804 1805 i = 0; 1806 do { 1807 unsigned int copy; 1808 1809 if (!sglen) { 1810 sg = sg_next(sg); 1811 if (!sg) { 1812 pr_warn("sg %d NULL, len %u/%u.\n", 1813 i, datalen, dlen); 1814 return -EINVAL; 1815 } 1816 sgoffset = 0; 1817 sglen = sg->length; 1818 page = sg_page(sg); 1819 1820 } 1821 copy = min(datalen, sglen); 1822 if (i && page == frags[i - 1].page && 1823 sgoffset + sg->offset == 1824 frags[i - 1].offset + frags[i - 1].size) { 1825 frags[i - 1].size += copy; 1826 } else { 1827 if (i >= frag_max) { 1828 pr_warn("too many pages %u, dlen %u.\n", 1829 frag_max, dlen); 1830 return -EINVAL; 1831 } 1832 1833 frags[i].page = page; 1834 frags[i].offset = sg->offset + sgoffset; 1835 frags[i].size = copy; 1836 i++; 1837 } 1838 datalen -= copy; 1839 sgoffset += copy; 1840 sglen -= copy; 1841 } while (datalen); 1842 1843 return i; 1844 } 1845 1846 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode) 1847 { 1848 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data; 1849 struct cxgbi_conn *cconn = tcp_conn->dd_data; 1850 struct cxgbi_device *cdev = cconn->chba->cdev; 1851 struct iscsi_conn *conn = task->conn; 1852 struct iscsi_tcp_task *tcp_task = task->dd_data; 1853 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); 1854 struct scsi_cmnd *sc = task->sc; 1855 int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX; 1856 1857 tcp_task->dd_data = tdata; 1858 task->hdr = NULL; 1859 1860 if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) && 1861 (opcode == ISCSI_OP_SCSI_DATA_OUT || 1862 (opcode == ISCSI_OP_SCSI_CMD && 1863 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE)))) 1864 /* data could goes into skb head */ 1865 headroom += min_t(unsigned int, 1866 SKB_MAX_HEAD(cdev->skb_tx_rsvd), 1867 conn->max_xmit_dlength); 1868 1869 tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC); 1870 if (!tdata->skb) { 1871 struct cxgbi_sock *csk = cconn->cep->csk; 1872 struct net_device *ndev = cdev->ports[csk->port_id]; 1873 ndev->stats.tx_dropped++; 1874 return -ENOMEM; 1875 } 1876 1877 skb_reserve(tdata->skb, cdev->skb_tx_rsvd); 1878 task->hdr = (struct iscsi_hdr *)tdata->skb->data; 1879 task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */ 1880 1881 /* data_out uses scsi_cmd's itt */ 1882 if (opcode != ISCSI_OP_SCSI_DATA_OUT) 1883 task_reserve_itt(task, &task->hdr->itt); 1884 1885 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, 1886 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n", 1887 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom, 1888 conn->max_xmit_dlength, ntohl(task->hdr->itt)); 1889 1890 return 0; 1891 } 1892 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu); 1893 1894 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc) 1895 { 1896 if (hcrc || dcrc) { 1897 u8 submode = 0; 1898 1899 if (hcrc) 1900 submode |= 1; 1901 if (dcrc) 1902 submode |= 2; 1903 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode; 1904 } else 1905 cxgbi_skcb_ulp_mode(skb) = 0; 1906 } 1907 1908 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset, 1909 unsigned int count) 1910 { 1911 struct iscsi_conn *conn = task->conn; 1912 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); 1913 struct sk_buff *skb = tdata->skb; 1914 unsigned int datalen = count; 1915 int i, padlen = iscsi_padding(count); 1916 struct page *pg; 1917 1918 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, 1919 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n", 1920 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK, 1921 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count); 1922 1923 skb_put(skb, task->hdr_len); 1924 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0); 1925 if (!count) 1926 return 0; 1927 1928 if (task->sc) { 1929 struct scsi_data_buffer *sdb = scsi_out(task->sc); 1930 struct scatterlist *sg = NULL; 1931 int err; 1932 1933 tdata->offset = offset; 1934 tdata->count = count; 1935 err = sgl_seek_offset( 1936 sdb->table.sgl, sdb->table.nents, 1937 tdata->offset, &tdata->sgoffset, &sg); 1938 if (err < 0) { 1939 pr_warn("tpdu, sgl %u, bad offset %u/%u.\n", 1940 sdb->table.nents, tdata->offset, sdb->length); 1941 return err; 1942 } 1943 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count, 1944 tdata->frags, MAX_PDU_FRAGS); 1945 if (err < 0) { 1946 pr_warn("tpdu, sgl %u, bad offset %u + %u.\n", 1947 sdb->table.nents, tdata->offset, tdata->count); 1948 return err; 1949 } 1950 tdata->nr_frags = err; 1951 1952 if (tdata->nr_frags > MAX_SKB_FRAGS || 1953 (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) { 1954 char *dst = skb->data + task->hdr_len; 1955 struct page_frag *frag = tdata->frags; 1956 1957 /* data fits in the skb's headroom */ 1958 for (i = 0; i < tdata->nr_frags; i++, frag++) { 1959 char *src = kmap_atomic(frag->page); 1960 1961 memcpy(dst, src+frag->offset, frag->size); 1962 dst += frag->size; 1963 kunmap_atomic(src); 1964 } 1965 if (padlen) { 1966 memset(dst, 0, padlen); 1967 padlen = 0; 1968 } 1969 skb_put(skb, count + padlen); 1970 } else { 1971 /* data fit into frag_list */ 1972 for (i = 0; i < tdata->nr_frags; i++) { 1973 __skb_fill_page_desc(skb, i, 1974 tdata->frags[i].page, 1975 tdata->frags[i].offset, 1976 tdata->frags[i].size); 1977 skb_frag_ref(skb, i); 1978 } 1979 skb_shinfo(skb)->nr_frags = tdata->nr_frags; 1980 skb->len += count; 1981 skb->data_len += count; 1982 skb->truesize += count; 1983 } 1984 1985 } else { 1986 pg = virt_to_page(task->data); 1987 1988 get_page(pg); 1989 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data), 1990 count); 1991 skb->len += count; 1992 skb->data_len += count; 1993 skb->truesize += count; 1994 } 1995 1996 if (padlen) { 1997 i = skb_shinfo(skb)->nr_frags; 1998 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, 1999 virt_to_page(padding), offset_in_page(padding), 2000 padlen); 2001 2002 skb->data_len += padlen; 2003 skb->truesize += padlen; 2004 skb->len += padlen; 2005 } 2006 2007 return 0; 2008 } 2009 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu); 2010 2011 int cxgbi_conn_xmit_pdu(struct iscsi_task *task) 2012 { 2013 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data; 2014 struct cxgbi_conn *cconn = tcp_conn->dd_data; 2015 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); 2016 struct sk_buff *skb = tdata->skb; 2017 unsigned int datalen; 2018 int err; 2019 2020 if (!skb) { 2021 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, 2022 "task 0x%p, skb NULL.\n", task); 2023 return 0; 2024 } 2025 2026 datalen = skb->data_len; 2027 tdata->skb = NULL; 2028 err = cxgbi_sock_send_pdus(cconn->cep->csk, skb); 2029 if (err > 0) { 2030 int pdulen = err; 2031 2032 log_debug(1 << CXGBI_DBG_PDU_TX, 2033 "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n", 2034 task, task->sc, skb, skb->len, skb->data_len, err); 2035 2036 if (task->conn->hdrdgst_en) 2037 pdulen += ISCSI_DIGEST_SIZE; 2038 2039 if (datalen && task->conn->datadgst_en) 2040 pdulen += ISCSI_DIGEST_SIZE; 2041 2042 task->conn->txdata_octets += pdulen; 2043 return 0; 2044 } 2045 2046 if (err == -EAGAIN || err == -ENOBUFS) { 2047 log_debug(1 << CXGBI_DBG_PDU_TX, 2048 "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n", 2049 task, skb, skb->len, skb->data_len, err); 2050 /* reset skb to send when we are called again */ 2051 tdata->skb = skb; 2052 return err; 2053 } 2054 2055 kfree_skb(skb); 2056 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX, 2057 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n", 2058 task->itt, skb, skb->len, skb->data_len, err); 2059 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err); 2060 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED); 2061 return err; 2062 } 2063 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu); 2064 2065 void cxgbi_cleanup_task(struct iscsi_task *task) 2066 { 2067 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task); 2068 2069 log_debug(1 << CXGBI_DBG_ISCSI, 2070 "task 0x%p, skb 0x%p, itt 0x%x.\n", 2071 task, tdata->skb, task->hdr_itt); 2072 2073 /* never reached the xmit task callout */ 2074 if (tdata->skb) 2075 __kfree_skb(tdata->skb); 2076 memset(tdata, 0, sizeof(*tdata)); 2077 2078 task_release_itt(task, task->hdr_itt); 2079 iscsi_tcp_cleanup_task(task); 2080 } 2081 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task); 2082 2083 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn, 2084 struct iscsi_stats *stats) 2085 { 2086 struct iscsi_conn *conn = cls_conn->dd_data; 2087 2088 stats->txdata_octets = conn->txdata_octets; 2089 stats->rxdata_octets = conn->rxdata_octets; 2090 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; 2091 stats->dataout_pdus = conn->dataout_pdus_cnt; 2092 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; 2093 stats->datain_pdus = conn->datain_pdus_cnt; 2094 stats->r2t_pdus = conn->r2t_pdus_cnt; 2095 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; 2096 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; 2097 stats->digest_err = 0; 2098 stats->timeout_err = 0; 2099 stats->custom_length = 1; 2100 strcpy(stats->custom[0].desc, "eh_abort_cnt"); 2101 stats->custom[0].value = conn->eh_abort_cnt; 2102 } 2103 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats); 2104 2105 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn) 2106 { 2107 struct iscsi_tcp_conn *tcp_conn = conn->dd_data; 2108 struct cxgbi_conn *cconn = tcp_conn->dd_data; 2109 struct cxgbi_device *cdev = cconn->chba->cdev; 2110 unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd); 2111 unsigned int max_def = 512 * MAX_SKB_FRAGS; 2112 unsigned int max = max(max_def, headroom); 2113 2114 max = min(cconn->chba->cdev->tx_max_size, max); 2115 if (conn->max_xmit_dlength) 2116 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max); 2117 else 2118 conn->max_xmit_dlength = max; 2119 cxgbi_align_pdu_size(conn->max_xmit_dlength); 2120 2121 return 0; 2122 } 2123 2124 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn) 2125 { 2126 struct iscsi_tcp_conn *tcp_conn = conn->dd_data; 2127 struct cxgbi_conn *cconn = tcp_conn->dd_data; 2128 unsigned int max = cconn->chba->cdev->rx_max_size; 2129 2130 cxgbi_align_pdu_size(max); 2131 2132 if (conn->max_recv_dlength) { 2133 if (conn->max_recv_dlength > max) { 2134 pr_err("MaxRecvDataSegmentLength %u > %u.\n", 2135 conn->max_recv_dlength, max); 2136 return -EINVAL; 2137 } 2138 conn->max_recv_dlength = min(conn->max_recv_dlength, max); 2139 cxgbi_align_pdu_size(conn->max_recv_dlength); 2140 } else 2141 conn->max_recv_dlength = max; 2142 2143 return 0; 2144 } 2145 2146 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn, 2147 enum iscsi_param param, char *buf, int buflen) 2148 { 2149 struct iscsi_conn *conn = cls_conn->dd_data; 2150 struct iscsi_session *session = conn->session; 2151 struct iscsi_tcp_conn *tcp_conn = conn->dd_data; 2152 struct cxgbi_conn *cconn = tcp_conn->dd_data; 2153 struct cxgbi_sock *csk = cconn->cep->csk; 2154 int value, err = 0; 2155 2156 log_debug(1 << CXGBI_DBG_ISCSI, 2157 "cls_conn 0x%p, param %d, buf(%d) %s.\n", 2158 cls_conn, param, buflen, buf); 2159 2160 switch (param) { 2161 case ISCSI_PARAM_HDRDGST_EN: 2162 err = iscsi_set_param(cls_conn, param, buf, buflen); 2163 if (!err && conn->hdrdgst_en) 2164 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid, 2165 conn->hdrdgst_en, 2166 conn->datadgst_en, 0); 2167 break; 2168 case ISCSI_PARAM_DATADGST_EN: 2169 err = iscsi_set_param(cls_conn, param, buf, buflen); 2170 if (!err && conn->datadgst_en) 2171 err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid, 2172 conn->hdrdgst_en, 2173 conn->datadgst_en, 0); 2174 break; 2175 case ISCSI_PARAM_MAX_R2T: 2176 sscanf(buf, "%d", &value); 2177 if (value <= 0 || !is_power_of_2(value)) 2178 return -EINVAL; 2179 if (session->max_r2t == value) 2180 break; 2181 iscsi_tcp_r2tpool_free(session); 2182 err = iscsi_set_param(cls_conn, param, buf, buflen); 2183 if (!err && iscsi_tcp_r2tpool_alloc(session)) 2184 return -ENOMEM; 2185 case ISCSI_PARAM_MAX_RECV_DLENGTH: 2186 err = iscsi_set_param(cls_conn, param, buf, buflen); 2187 if (!err) 2188 err = cxgbi_conn_max_recv_dlength(conn); 2189 break; 2190 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 2191 err = iscsi_set_param(cls_conn, param, buf, buflen); 2192 if (!err) 2193 err = cxgbi_conn_max_xmit_dlength(conn); 2194 break; 2195 default: 2196 return iscsi_set_param(cls_conn, param, buf, buflen); 2197 } 2198 return err; 2199 } 2200 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param); 2201 2202 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param, 2203 char *buf) 2204 { 2205 struct cxgbi_endpoint *cep = ep->dd_data; 2206 struct cxgbi_sock *csk; 2207 int len; 2208 2209 log_debug(1 << CXGBI_DBG_ISCSI, 2210 "cls_conn 0x%p, param %d.\n", ep, param); 2211 2212 switch (param) { 2213 case ISCSI_PARAM_CONN_PORT: 2214 case ISCSI_PARAM_CONN_ADDRESS: 2215 if (!cep) 2216 return -ENOTCONN; 2217 2218 csk = cep->csk; 2219 if (!csk) 2220 return -ENOTCONN; 2221 2222 return iscsi_conn_get_addr_param((struct sockaddr_storage *) 2223 &csk->daddr, param, buf); 2224 default: 2225 return -ENOSYS; 2226 } 2227 return len; 2228 } 2229 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param); 2230 2231 struct iscsi_cls_conn * 2232 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid) 2233 { 2234 struct iscsi_cls_conn *cls_conn; 2235 struct iscsi_conn *conn; 2236 struct iscsi_tcp_conn *tcp_conn; 2237 struct cxgbi_conn *cconn; 2238 2239 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid); 2240 if (!cls_conn) 2241 return NULL; 2242 2243 conn = cls_conn->dd_data; 2244 tcp_conn = conn->dd_data; 2245 cconn = tcp_conn->dd_data; 2246 cconn->iconn = conn; 2247 2248 log_debug(1 << CXGBI_DBG_ISCSI, 2249 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n", 2250 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn); 2251 2252 return cls_conn; 2253 } 2254 EXPORT_SYMBOL_GPL(cxgbi_create_conn); 2255 2256 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session, 2257 struct iscsi_cls_conn *cls_conn, 2258 u64 transport_eph, int is_leading) 2259 { 2260 struct iscsi_conn *conn = cls_conn->dd_data; 2261 struct iscsi_tcp_conn *tcp_conn = conn->dd_data; 2262 struct cxgbi_conn *cconn = tcp_conn->dd_data; 2263 struct iscsi_endpoint *ep; 2264 struct cxgbi_endpoint *cep; 2265 struct cxgbi_sock *csk; 2266 int err; 2267 2268 ep = iscsi_lookup_endpoint(transport_eph); 2269 if (!ep) 2270 return -EINVAL; 2271 2272 /* setup ddp pagesize */ 2273 cep = ep->dd_data; 2274 csk = cep->csk; 2275 err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0); 2276 if (err < 0) 2277 return err; 2278 2279 err = iscsi_conn_bind(cls_session, cls_conn, is_leading); 2280 if (err) 2281 return -EINVAL; 2282 2283 /* calculate the tag idx bits needed for this conn based on cmds_max */ 2284 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1; 2285 2286 write_lock_bh(&csk->callback_lock); 2287 csk->user_data = conn; 2288 cconn->chba = cep->chba; 2289 cconn->cep = cep; 2290 cep->cconn = cconn; 2291 write_unlock_bh(&csk->callback_lock); 2292 2293 cxgbi_conn_max_xmit_dlength(conn); 2294 cxgbi_conn_max_recv_dlength(conn); 2295 2296 log_debug(1 << CXGBI_DBG_ISCSI, 2297 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n", 2298 cls_session, cls_conn, ep, cconn, csk); 2299 /* init recv engine */ 2300 iscsi_tcp_hdr_recv_prep(tcp_conn); 2301 2302 return 0; 2303 } 2304 EXPORT_SYMBOL_GPL(cxgbi_bind_conn); 2305 2306 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep, 2307 u16 cmds_max, u16 qdepth, 2308 u32 initial_cmdsn) 2309 { 2310 struct cxgbi_endpoint *cep; 2311 struct cxgbi_hba *chba; 2312 struct Scsi_Host *shost; 2313 struct iscsi_cls_session *cls_session; 2314 struct iscsi_session *session; 2315 2316 if (!ep) { 2317 pr_err("missing endpoint.\n"); 2318 return NULL; 2319 } 2320 2321 cep = ep->dd_data; 2322 chba = cep->chba; 2323 shost = chba->shost; 2324 2325 BUG_ON(chba != iscsi_host_priv(shost)); 2326 2327 cls_session = iscsi_session_setup(chba->cdev->itp, shost, 2328 cmds_max, 0, 2329 sizeof(struct iscsi_tcp_task) + 2330 sizeof(struct cxgbi_task_data), 2331 initial_cmdsn, ISCSI_MAX_TARGET); 2332 if (!cls_session) 2333 return NULL; 2334 2335 session = cls_session->dd_data; 2336 if (iscsi_tcp_r2tpool_alloc(session)) 2337 goto remove_session; 2338 2339 log_debug(1 << CXGBI_DBG_ISCSI, 2340 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session); 2341 return cls_session; 2342 2343 remove_session: 2344 iscsi_session_teardown(cls_session); 2345 return NULL; 2346 } 2347 EXPORT_SYMBOL_GPL(cxgbi_create_session); 2348 2349 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session) 2350 { 2351 log_debug(1 << CXGBI_DBG_ISCSI, 2352 "cls sess 0x%p.\n", cls_session); 2353 2354 iscsi_tcp_r2tpool_free(cls_session->dd_data); 2355 iscsi_session_teardown(cls_session); 2356 } 2357 EXPORT_SYMBOL_GPL(cxgbi_destroy_session); 2358 2359 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param, 2360 char *buf, int buflen) 2361 { 2362 struct cxgbi_hba *chba = iscsi_host_priv(shost); 2363 2364 if (!chba->ndev) { 2365 shost_printk(KERN_ERR, shost, "Could not get host param. " 2366 "netdev for host not set.\n"); 2367 return -ENODEV; 2368 } 2369 2370 log_debug(1 << CXGBI_DBG_ISCSI, 2371 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n", 2372 shost, chba, chba->ndev->name, param, buflen, buf); 2373 2374 switch (param) { 2375 case ISCSI_HOST_PARAM_IPADDRESS: 2376 { 2377 __be32 addr = in_aton(buf); 2378 log_debug(1 << CXGBI_DBG_ISCSI, 2379 "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr); 2380 cxgbi_set_iscsi_ipv4(chba, addr); 2381 return 0; 2382 } 2383 case ISCSI_HOST_PARAM_HWADDRESS: 2384 case ISCSI_HOST_PARAM_NETDEV_NAME: 2385 return 0; 2386 default: 2387 return iscsi_host_set_param(shost, param, buf, buflen); 2388 } 2389 } 2390 EXPORT_SYMBOL_GPL(cxgbi_set_host_param); 2391 2392 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param, 2393 char *buf) 2394 { 2395 struct cxgbi_hba *chba = iscsi_host_priv(shost); 2396 int len = 0; 2397 2398 if (!chba->ndev) { 2399 shost_printk(KERN_ERR, shost, "Could not get host param. " 2400 "netdev for host not set.\n"); 2401 return -ENODEV; 2402 } 2403 2404 log_debug(1 << CXGBI_DBG_ISCSI, 2405 "shost 0x%p, hba 0x%p,%s, param %d.\n", 2406 shost, chba, chba->ndev->name, param); 2407 2408 switch (param) { 2409 case ISCSI_HOST_PARAM_HWADDRESS: 2410 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6); 2411 break; 2412 case ISCSI_HOST_PARAM_NETDEV_NAME: 2413 len = sprintf(buf, "%s\n", chba->ndev->name); 2414 break; 2415 case ISCSI_HOST_PARAM_IPADDRESS: 2416 { 2417 __be32 addr; 2418 2419 addr = cxgbi_get_iscsi_ipv4(chba); 2420 len = sprintf(buf, "%pI4", &addr); 2421 log_debug(1 << CXGBI_DBG_ISCSI, 2422 "hba %s, ipv4 %pI4.\n", chba->ndev->name, &addr); 2423 break; 2424 } 2425 default: 2426 return iscsi_host_get_param(shost, param, buf); 2427 } 2428 2429 return len; 2430 } 2431 EXPORT_SYMBOL_GPL(cxgbi_get_host_param); 2432 2433 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost, 2434 struct sockaddr *dst_addr, 2435 int non_blocking) 2436 { 2437 struct iscsi_endpoint *ep; 2438 struct cxgbi_endpoint *cep; 2439 struct cxgbi_hba *hba = NULL; 2440 struct cxgbi_sock *csk; 2441 int err = -EINVAL; 2442 2443 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK, 2444 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n", 2445 shost, non_blocking, dst_addr); 2446 2447 if (shost) { 2448 hba = iscsi_host_priv(shost); 2449 if (!hba) { 2450 pr_info("shost 0x%p, priv NULL.\n", shost); 2451 goto err_out; 2452 } 2453 } 2454 2455 csk = cxgbi_check_route(dst_addr); 2456 if (IS_ERR(csk)) 2457 return (struct iscsi_endpoint *)csk; 2458 cxgbi_sock_get(csk); 2459 2460 if (!hba) 2461 hba = csk->cdev->hbas[csk->port_id]; 2462 else if (hba != csk->cdev->hbas[csk->port_id]) { 2463 pr_info("Could not connect through requested host %u" 2464 "hba 0x%p != 0x%p (%u).\n", 2465 shost->host_no, hba, 2466 csk->cdev->hbas[csk->port_id], csk->port_id); 2467 err = -ENOSPC; 2468 goto release_conn; 2469 } 2470 2471 err = sock_get_port(csk); 2472 if (err) 2473 goto release_conn; 2474 2475 cxgbi_sock_set_state(csk, CTP_CONNECTING); 2476 err = csk->cdev->csk_init_act_open(csk); 2477 if (err) 2478 goto release_conn; 2479 2480 if (cxgbi_sock_is_closing(csk)) { 2481 err = -ENOSPC; 2482 pr_info("csk 0x%p is closing.\n", csk); 2483 goto release_conn; 2484 } 2485 2486 ep = iscsi_create_endpoint(sizeof(*cep)); 2487 if (!ep) { 2488 err = -ENOMEM; 2489 pr_info("iscsi alloc ep, OOM.\n"); 2490 goto release_conn; 2491 } 2492 2493 cep = ep->dd_data; 2494 cep->csk = csk; 2495 cep->chba = hba; 2496 2497 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK, 2498 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n", 2499 ep, cep, csk, hba, hba->ndev->name); 2500 return ep; 2501 2502 release_conn: 2503 cxgbi_sock_put(csk); 2504 cxgbi_sock_closed(csk); 2505 err_out: 2506 return ERR_PTR(err); 2507 } 2508 EXPORT_SYMBOL_GPL(cxgbi_ep_connect); 2509 2510 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) 2511 { 2512 struct cxgbi_endpoint *cep = ep->dd_data; 2513 struct cxgbi_sock *csk = cep->csk; 2514 2515 if (!cxgbi_sock_is_established(csk)) 2516 return 0; 2517 return 1; 2518 } 2519 EXPORT_SYMBOL_GPL(cxgbi_ep_poll); 2520 2521 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep) 2522 { 2523 struct cxgbi_endpoint *cep = ep->dd_data; 2524 struct cxgbi_conn *cconn = cep->cconn; 2525 struct cxgbi_sock *csk = cep->csk; 2526 2527 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK, 2528 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n", 2529 ep, cep, cconn, csk, csk->state, csk->flags); 2530 2531 if (cconn && cconn->iconn) { 2532 iscsi_suspend_tx(cconn->iconn); 2533 write_lock_bh(&csk->callback_lock); 2534 cep->csk->user_data = NULL; 2535 cconn->cep = NULL; 2536 write_unlock_bh(&csk->callback_lock); 2537 } 2538 iscsi_destroy_endpoint(ep); 2539 2540 if (likely(csk->state >= CTP_ESTABLISHED)) 2541 need_active_close(csk); 2542 else 2543 cxgbi_sock_closed(csk); 2544 2545 cxgbi_sock_put(csk); 2546 } 2547 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect); 2548 2549 int cxgbi_iscsi_init(struct iscsi_transport *itp, 2550 struct scsi_transport_template **stt) 2551 { 2552 *stt = iscsi_register_transport(itp); 2553 if (*stt == NULL) { 2554 pr_err("unable to register %s transport 0x%p.\n", 2555 itp->name, itp); 2556 return -ENODEV; 2557 } 2558 log_debug(1 << CXGBI_DBG_ISCSI, 2559 "%s, registered iscsi transport 0x%p.\n", 2560 itp->name, stt); 2561 return 0; 2562 } 2563 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init); 2564 2565 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp, 2566 struct scsi_transport_template **stt) 2567 { 2568 if (*stt) { 2569 log_debug(1 << CXGBI_DBG_ISCSI, 2570 "de-register transport 0x%p, %s, stt 0x%p.\n", 2571 itp, itp->name, *stt); 2572 *stt = NULL; 2573 iscsi_unregister_transport(itp); 2574 } 2575 } 2576 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup); 2577 2578 umode_t cxgbi_attr_is_visible(int param_type, int param) 2579 { 2580 switch (param_type) { 2581 case ISCSI_HOST_PARAM: 2582 switch (param) { 2583 case ISCSI_HOST_PARAM_NETDEV_NAME: 2584 case ISCSI_HOST_PARAM_HWADDRESS: 2585 case ISCSI_HOST_PARAM_IPADDRESS: 2586 case ISCSI_HOST_PARAM_INITIATOR_NAME: 2587 return S_IRUGO; 2588 default: 2589 return 0; 2590 } 2591 case ISCSI_PARAM: 2592 switch (param) { 2593 case ISCSI_PARAM_MAX_RECV_DLENGTH: 2594 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 2595 case ISCSI_PARAM_HDRDGST_EN: 2596 case ISCSI_PARAM_DATADGST_EN: 2597 case ISCSI_PARAM_CONN_ADDRESS: 2598 case ISCSI_PARAM_CONN_PORT: 2599 case ISCSI_PARAM_EXP_STATSN: 2600 case ISCSI_PARAM_PERSISTENT_ADDRESS: 2601 case ISCSI_PARAM_PERSISTENT_PORT: 2602 case ISCSI_PARAM_PING_TMO: 2603 case ISCSI_PARAM_RECV_TMO: 2604 case ISCSI_PARAM_INITIAL_R2T_EN: 2605 case ISCSI_PARAM_MAX_R2T: 2606 case ISCSI_PARAM_IMM_DATA_EN: 2607 case ISCSI_PARAM_FIRST_BURST: 2608 case ISCSI_PARAM_MAX_BURST: 2609 case ISCSI_PARAM_PDU_INORDER_EN: 2610 case ISCSI_PARAM_DATASEQ_INORDER_EN: 2611 case ISCSI_PARAM_ERL: 2612 case ISCSI_PARAM_TARGET_NAME: 2613 case ISCSI_PARAM_TPGT: 2614 case ISCSI_PARAM_USERNAME: 2615 case ISCSI_PARAM_PASSWORD: 2616 case ISCSI_PARAM_USERNAME_IN: 2617 case ISCSI_PARAM_PASSWORD_IN: 2618 case ISCSI_PARAM_FAST_ABORT: 2619 case ISCSI_PARAM_ABORT_TMO: 2620 case ISCSI_PARAM_LU_RESET_TMO: 2621 case ISCSI_PARAM_TGT_RESET_TMO: 2622 case ISCSI_PARAM_IFACE_NAME: 2623 case ISCSI_PARAM_INITIATOR_NAME: 2624 return S_IRUGO; 2625 default: 2626 return 0; 2627 } 2628 } 2629 2630 return 0; 2631 } 2632 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible); 2633 2634 static int __init libcxgbi_init_module(void) 2635 { 2636 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1; 2637 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1; 2638 2639 pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n", 2640 ISCSI_ITT_MASK, sw_tag_idx_bits, 2641 ISCSI_AGE_MASK, sw_tag_age_bits); 2642 2643 ddp_setup_host_page_size(); 2644 return 0; 2645 } 2646 2647 static void __exit libcxgbi_exit_module(void) 2648 { 2649 cxgbi_device_unregister_all(0xFF); 2650 return; 2651 } 2652 2653 module_init(libcxgbi_init_module); 2654 module_exit(libcxgbi_exit_module); 2655