1 /* 2 * iSCSI lib functions 3 * 4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved. 5 * Copyright (C) 2004 - 2006 Mike Christie 6 * Copyright (C) 2004 - 2005 Dmitry Yusupov 7 * Copyright (C) 2004 - 2005 Alex Aizman 8 * maintained by open-iscsi@googlegroups.com 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 23 */ 24 #include <linux/types.h> 25 #include <linux/kfifo.h> 26 #include <linux/delay.h> 27 #include <asm/unaligned.h> 28 #include <net/tcp.h> 29 #include <scsi/scsi_cmnd.h> 30 #include <scsi/scsi_device.h> 31 #include <scsi/scsi_eh.h> 32 #include <scsi/scsi_tcq.h> 33 #include <scsi/scsi_host.h> 34 #include <scsi/scsi.h> 35 #include <scsi/iscsi_proto.h> 36 #include <scsi/scsi_transport.h> 37 #include <scsi/scsi_transport_iscsi.h> 38 #include <scsi/libiscsi.h> 39 40 struct iscsi_session * 41 class_to_transport_session(struct iscsi_cls_session *cls_session) 42 { 43 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 44 return iscsi_hostdata(shost->hostdata); 45 } 46 EXPORT_SYMBOL_GPL(class_to_transport_session); 47 48 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ 49 #define SNA32_CHECK 2147483648UL 50 51 static int iscsi_sna_lt(u32 n1, u32 n2) 52 { 53 return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || 54 (n1 > n2 && (n2 - n1 < SNA32_CHECK))); 55 } 56 57 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ 58 static int iscsi_sna_lte(u32 n1, u32 n2) 59 { 60 return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || 61 (n1 > n2 && (n2 - n1 < SNA32_CHECK))); 62 } 63 64 void 65 iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) 66 { 67 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); 68 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); 69 70 /* 71 * standard specifies this check for when to update expected and 72 * max sequence numbers 73 */ 74 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) 75 return; 76 77 if (exp_cmdsn != session->exp_cmdsn && 78 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) 79 session->exp_cmdsn = exp_cmdsn; 80 81 if (max_cmdsn != session->max_cmdsn && 82 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) { 83 session->max_cmdsn = max_cmdsn; 84 /* 85 * if the window closed with IO queued, then kick the 86 * xmit thread 87 */ 88 if (!list_empty(&session->leadconn->xmitqueue) || 89 __kfifo_len(session->leadconn->mgmtqueue)) 90 scsi_queue_work(session->host, 91 &session->leadconn->xmitwork); 92 } 93 } 94 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); 95 96 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask, 97 struct iscsi_data *hdr) 98 { 99 struct iscsi_conn *conn = ctask->conn; 100 101 memset(hdr, 0, sizeof(struct iscsi_data)); 102 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); 103 hdr->datasn = cpu_to_be32(ctask->unsol_datasn); 104 ctask->unsol_datasn++; 105 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; 106 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); 107 108 hdr->itt = ctask->hdr->itt; 109 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); 110 hdr->offset = cpu_to_be32(ctask->unsol_offset); 111 112 if (ctask->unsol_count > conn->max_xmit_dlength) { 113 hton24(hdr->dlength, conn->max_xmit_dlength); 114 ctask->data_count = conn->max_xmit_dlength; 115 ctask->unsol_offset += ctask->data_count; 116 hdr->flags = 0; 117 } else { 118 hton24(hdr->dlength, ctask->unsol_count); 119 ctask->data_count = ctask->unsol_count; 120 hdr->flags = ISCSI_FLAG_CMD_FINAL; 121 } 122 } 123 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); 124 125 /** 126 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu 127 * @ctask: iscsi cmd task 128 * 129 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set 130 * fields like dlength or final based on how much data it sends 131 */ 132 static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) 133 { 134 struct iscsi_conn *conn = ctask->conn; 135 struct iscsi_session *session = conn->session; 136 struct iscsi_cmd *hdr = ctask->hdr; 137 struct scsi_cmnd *sc = ctask->sc; 138 139 hdr->opcode = ISCSI_OP_SCSI_CMD; 140 hdr->flags = ISCSI_ATTR_SIMPLE; 141 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); 142 hdr->itt = build_itt(ctask->itt, conn->id, session->age); 143 hdr->data_length = cpu_to_be32(scsi_bufflen(sc)); 144 hdr->cmdsn = cpu_to_be32(session->cmdsn); 145 session->cmdsn++; 146 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); 147 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len); 148 if (sc->cmd_len < MAX_COMMAND_SIZE) 149 memset(&hdr->cdb[sc->cmd_len], 0, 150 MAX_COMMAND_SIZE - sc->cmd_len); 151 152 ctask->data_count = 0; 153 ctask->imm_count = 0; 154 if (sc->sc_data_direction == DMA_TO_DEVICE) { 155 hdr->flags |= ISCSI_FLAG_CMD_WRITE; 156 /* 157 * Write counters: 158 * 159 * imm_count bytes to be sent right after 160 * SCSI PDU Header 161 * 162 * unsol_count bytes(as Data-Out) to be sent 163 * without R2T ack right after 164 * immediate data 165 * 166 * r2t_data_count bytes to be sent via R2T ack's 167 * 168 * pad_count bytes to be sent as zero-padding 169 */ 170 ctask->unsol_count = 0; 171 ctask->unsol_offset = 0; 172 ctask->unsol_datasn = 0; 173 174 if (session->imm_data_en) { 175 if (scsi_bufflen(sc) >= session->first_burst) 176 ctask->imm_count = min(session->first_burst, 177 conn->max_xmit_dlength); 178 else 179 ctask->imm_count = min(scsi_bufflen(sc), 180 conn->max_xmit_dlength); 181 hton24(ctask->hdr->dlength, ctask->imm_count); 182 } else 183 zero_data(ctask->hdr->dlength); 184 185 if (!session->initial_r2t_en) { 186 ctask->unsol_count = min((session->first_burst), 187 (scsi_bufflen(sc))) - ctask->imm_count; 188 ctask->unsol_offset = ctask->imm_count; 189 } 190 191 if (!ctask->unsol_count) 192 /* No unsolicit Data-Out's */ 193 ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL; 194 } else { 195 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 196 zero_data(hdr->dlength); 197 198 if (sc->sc_data_direction == DMA_FROM_DEVICE) 199 hdr->flags |= ISCSI_FLAG_CMD_READ; 200 } 201 202 conn->scsicmd_pdus_cnt++; 203 204 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d " 205 "cmdsn %d win %d]\n", 206 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", 207 conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc), 208 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); 209 } 210 211 /** 212 * iscsi_complete_command - return command back to scsi-ml 213 * @ctask: iscsi cmd task 214 * 215 * Must be called with session lock. 216 * This function returns the scsi command to scsi-ml and returns 217 * the cmd task to the pool of available cmd tasks. 218 */ 219 static void iscsi_complete_command(struct iscsi_cmd_task *ctask) 220 { 221 struct iscsi_session *session = ctask->conn->session; 222 struct scsi_cmnd *sc = ctask->sc; 223 224 ctask->state = ISCSI_TASK_COMPLETED; 225 ctask->sc = NULL; 226 /* SCSI eh reuses commands to verify us */ 227 sc->SCp.ptr = NULL; 228 list_del_init(&ctask->running); 229 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); 230 sc->scsi_done(sc); 231 } 232 233 static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask) 234 { 235 atomic_inc(&ctask->refcount); 236 } 237 238 static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask) 239 { 240 if (atomic_dec_and_test(&ctask->refcount)) 241 iscsi_complete_command(ctask); 242 } 243 244 /** 245 * iscsi_cmd_rsp - SCSI Command Response processing 246 * @conn: iscsi connection 247 * @hdr: iscsi header 248 * @ctask: scsi command task 249 * @data: cmd data buffer 250 * @datalen: len of buffer 251 * 252 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and 253 * then completes the command and task. 254 **/ 255 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 256 struct iscsi_cmd_task *ctask, char *data, 257 int datalen) 258 { 259 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; 260 struct iscsi_session *session = conn->session; 261 struct scsi_cmnd *sc = ctask->sc; 262 263 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); 264 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; 265 266 sc->result = (DID_OK << 16) | rhdr->cmd_status; 267 268 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { 269 sc->result = DID_ERROR << 16; 270 goto out; 271 } 272 273 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { 274 uint16_t senselen; 275 276 if (datalen < 2) { 277 invalid_datalen: 278 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but " 279 "invalid data buffer size of %d\n", datalen); 280 sc->result = DID_BAD_TARGET << 16; 281 goto out; 282 } 283 284 senselen = be16_to_cpu(get_unaligned((__be16 *) data)); 285 if (datalen < senselen) 286 goto invalid_datalen; 287 288 memcpy(sc->sense_buffer, data + 2, 289 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); 290 debug_scsi("copied %d bytes of sense\n", 291 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); 292 } 293 294 if (sc->sc_data_direction == DMA_TO_DEVICE) 295 goto out; 296 297 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { 298 int res_count = be32_to_cpu(rhdr->residual_count); 299 300 if (res_count > 0 && res_count <= scsi_bufflen(sc)) 301 scsi_set_resid(sc, res_count); 302 else 303 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 304 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) 305 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 306 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) 307 scsi_set_resid(sc, be32_to_cpu(rhdr->residual_count)); 308 309 out: 310 debug_scsi("done [sc %lx res %d itt 0x%x]\n", 311 (long)sc, sc->result, ctask->itt); 312 conn->scsirsp_pdus_cnt++; 313 314 __iscsi_put_ctask(ctask); 315 } 316 317 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) 318 { 319 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; 320 321 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 322 conn->tmfrsp_pdus_cnt++; 323 324 if (conn->tmabort_state != TMABORT_INITIAL) 325 return; 326 327 if (tmf->response == ISCSI_TMF_RSP_COMPLETE) 328 conn->tmabort_state = TMABORT_SUCCESS; 329 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) 330 conn->tmabort_state = TMABORT_NOT_FOUND; 331 else 332 conn->tmabort_state = TMABORT_FAILED; 333 wake_up(&conn->ehwait); 334 } 335 336 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 337 char *data, int datalen) 338 { 339 struct iscsi_reject *reject = (struct iscsi_reject *)hdr; 340 struct iscsi_hdr rejected_pdu; 341 uint32_t itt; 342 343 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; 344 345 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) { 346 if (ntoh24(reject->dlength) > datalen) 347 return ISCSI_ERR_PROTO; 348 349 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { 350 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); 351 itt = get_itt(rejected_pdu.itt); 352 printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected " 353 "due to DataDigest error.\n", itt, 354 rejected_pdu.opcode); 355 } 356 } 357 return 0; 358 } 359 360 /** 361 * __iscsi_complete_pdu - complete pdu 362 * @conn: iscsi conn 363 * @hdr: iscsi header 364 * @data: data buffer 365 * @datalen: len of data buffer 366 * 367 * Completes pdu processing by freeing any resources allocated at 368 * queuecommand or send generic. session lock must be held and verify 369 * itt must have been called. 370 */ 371 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 372 char *data, int datalen) 373 { 374 struct iscsi_session *session = conn->session; 375 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; 376 struct iscsi_cmd_task *ctask; 377 struct iscsi_mgmt_task *mtask; 378 uint32_t itt; 379 380 if (hdr->itt != RESERVED_ITT) 381 itt = get_itt(hdr->itt); 382 else 383 itt = ~0U; 384 385 if (itt < session->cmds_max) { 386 ctask = session->cmds[itt]; 387 388 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n", 389 opcode, conn->id, ctask->itt, datalen); 390 391 switch(opcode) { 392 case ISCSI_OP_SCSI_CMD_RSP: 393 BUG_ON((void*)ctask != ctask->sc->SCp.ptr); 394 iscsi_scsi_cmd_rsp(conn, hdr, ctask, data, 395 datalen); 396 break; 397 case ISCSI_OP_SCSI_DATA_IN: 398 BUG_ON((void*)ctask != ctask->sc->SCp.ptr); 399 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 400 conn->scsirsp_pdus_cnt++; 401 __iscsi_put_ctask(ctask); 402 } 403 break; 404 case ISCSI_OP_R2T: 405 /* LLD handles this for now */ 406 break; 407 default: 408 rc = ISCSI_ERR_BAD_OPCODE; 409 break; 410 } 411 } else if (itt >= ISCSI_MGMT_ITT_OFFSET && 412 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) { 413 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET]; 414 415 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", 416 opcode, conn->id, mtask->itt, datalen); 417 418 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 419 switch(opcode) { 420 case ISCSI_OP_LOGOUT_RSP: 421 if (datalen) { 422 rc = ISCSI_ERR_PROTO; 423 break; 424 } 425 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 426 /* fall through */ 427 case ISCSI_OP_LOGIN_RSP: 428 case ISCSI_OP_TEXT_RSP: 429 /* 430 * login related PDU's exp_statsn is handled in 431 * userspace 432 */ 433 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 434 rc = ISCSI_ERR_CONN_FAILED; 435 list_del(&mtask->running); 436 if (conn->login_mtask != mtask) 437 __kfifo_put(session->mgmtpool.queue, 438 (void*)&mtask, sizeof(void*)); 439 break; 440 case ISCSI_OP_SCSI_TMFUNC_RSP: 441 if (datalen) { 442 rc = ISCSI_ERR_PROTO; 443 break; 444 } 445 446 iscsi_tmf_rsp(conn, hdr); 447 break; 448 case ISCSI_OP_NOOP_IN: 449 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { 450 rc = ISCSI_ERR_PROTO; 451 break; 452 } 453 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 454 455 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 456 rc = ISCSI_ERR_CONN_FAILED; 457 list_del(&mtask->running); 458 if (conn->login_mtask != mtask) 459 __kfifo_put(session->mgmtpool.queue, 460 (void*)&mtask, sizeof(void*)); 461 break; 462 default: 463 rc = ISCSI_ERR_BAD_OPCODE; 464 break; 465 } 466 } else if (itt == ~0U) { 467 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 468 469 switch(opcode) { 470 case ISCSI_OP_NOOP_IN: 471 if (datalen) { 472 rc = ISCSI_ERR_PROTO; 473 break; 474 } 475 476 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) 477 break; 478 479 if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0)) 480 rc = ISCSI_ERR_CONN_FAILED; 481 break; 482 case ISCSI_OP_REJECT: 483 rc = iscsi_handle_reject(conn, hdr, data, datalen); 484 break; 485 case ISCSI_OP_ASYNC_EVENT: 486 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 487 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 488 rc = ISCSI_ERR_CONN_FAILED; 489 break; 490 default: 491 rc = ISCSI_ERR_BAD_OPCODE; 492 break; 493 } 494 } else 495 rc = ISCSI_ERR_BAD_ITT; 496 497 return rc; 498 } 499 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); 500 501 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 502 char *data, int datalen) 503 { 504 int rc; 505 506 spin_lock(&conn->session->lock); 507 rc = __iscsi_complete_pdu(conn, hdr, data, datalen); 508 spin_unlock(&conn->session->lock); 509 return rc; 510 } 511 EXPORT_SYMBOL_GPL(iscsi_complete_pdu); 512 513 /* verify itt (itt encoding: age+cid+itt) */ 514 int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 515 uint32_t *ret_itt) 516 { 517 struct iscsi_session *session = conn->session; 518 struct iscsi_cmd_task *ctask; 519 uint32_t itt; 520 521 if (hdr->itt != RESERVED_ITT) { 522 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) != 523 (session->age << ISCSI_AGE_SHIFT)) { 524 printk(KERN_ERR "iscsi: received itt %x expected " 525 "session age (%x)\n", (__force u32)hdr->itt, 526 session->age & ISCSI_AGE_MASK); 527 return ISCSI_ERR_BAD_ITT; 528 } 529 530 if (((__force u32)hdr->itt & ISCSI_CID_MASK) != 531 (conn->id << ISCSI_CID_SHIFT)) { 532 printk(KERN_ERR "iscsi: received itt %x, expected " 533 "CID (%x)\n", (__force u32)hdr->itt, conn->id); 534 return ISCSI_ERR_BAD_ITT; 535 } 536 itt = get_itt(hdr->itt); 537 } else 538 itt = ~0U; 539 540 if (itt < session->cmds_max) { 541 ctask = session->cmds[itt]; 542 543 if (!ctask->sc) { 544 printk(KERN_INFO "iscsi: dropping ctask with " 545 "itt 0x%x\n", ctask->itt); 546 /* force drop */ 547 return ISCSI_ERR_NO_SCSI_CMD; 548 } 549 550 if (ctask->sc->SCp.phase != session->age) { 551 printk(KERN_ERR "iscsi: ctask's session age %d, " 552 "expected %d\n", ctask->sc->SCp.phase, 553 session->age); 554 return ISCSI_ERR_SESSION_FAILED; 555 } 556 } 557 558 *ret_itt = itt; 559 return 0; 560 } 561 EXPORT_SYMBOL_GPL(iscsi_verify_itt); 562 563 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) 564 { 565 struct iscsi_session *session = conn->session; 566 unsigned long flags; 567 568 spin_lock_irqsave(&session->lock, flags); 569 if (session->state == ISCSI_STATE_FAILED) { 570 spin_unlock_irqrestore(&session->lock, flags); 571 return; 572 } 573 574 if (conn->stop_stage == 0) 575 session->state = ISCSI_STATE_FAILED; 576 spin_unlock_irqrestore(&session->lock, flags); 577 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 578 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 579 iscsi_conn_error(conn->cls_conn, err); 580 } 581 EXPORT_SYMBOL_GPL(iscsi_conn_failure); 582 583 static void iscsi_prep_mtask(struct iscsi_conn *conn, 584 struct iscsi_mgmt_task *mtask) 585 { 586 struct iscsi_session *session = conn->session; 587 struct iscsi_hdr *hdr = mtask->hdr; 588 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; 589 590 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) && 591 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) 592 nop->exp_statsn = cpu_to_be32(conn->exp_statsn); 593 /* 594 * pre-format CmdSN for outgoing PDU. 595 */ 596 nop->cmdsn = cpu_to_be32(session->cmdsn); 597 if (hdr->itt != RESERVED_ITT) { 598 hdr->itt = build_itt(mtask->itt, conn->id, session->age); 599 /* 600 * TODO: We always use immediate, so we never hit this. 601 * If we start to send tmfs or nops as non-immediate then 602 * we should start checking the cmdsn numbers for mgmt tasks. 603 */ 604 if (conn->c_stage == ISCSI_CONN_STARTED && 605 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 606 session->queued_cmdsn++; 607 session->cmdsn++; 608 } 609 } 610 611 if (session->tt->init_mgmt_task) 612 session->tt->init_mgmt_task(conn, mtask); 613 614 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", 615 hdr->opcode, hdr->itt, mtask->data_count); 616 } 617 618 static int iscsi_xmit_mtask(struct iscsi_conn *conn) 619 { 620 struct iscsi_hdr *hdr = conn->mtask->hdr; 621 int rc, was_logout = 0; 622 623 spin_unlock_bh(&conn->session->lock); 624 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) { 625 conn->session->state = ISCSI_STATE_IN_RECOVERY; 626 iscsi_block_session(session_to_cls(conn->session)); 627 was_logout = 1; 628 } 629 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask); 630 spin_lock_bh(&conn->session->lock); 631 if (rc) 632 return rc; 633 634 /* done with this in-progress mtask */ 635 conn->mtask = NULL; 636 637 if (was_logout) { 638 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 639 return -ENODATA; 640 } 641 return 0; 642 } 643 644 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) 645 { 646 struct iscsi_session *session = conn->session; 647 648 /* 649 * Check for iSCSI window and take care of CmdSN wrap-around 650 */ 651 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { 652 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u " 653 "CmdSN %u/%u\n", session->exp_cmdsn, 654 session->max_cmdsn, session->cmdsn, 655 session->queued_cmdsn); 656 return -ENOSPC; 657 } 658 return 0; 659 } 660 661 static int iscsi_xmit_ctask(struct iscsi_conn *conn) 662 { 663 struct iscsi_cmd_task *ctask = conn->ctask; 664 int rc = 0; 665 666 /* 667 * serialize with TMF AbortTask 668 */ 669 if (ctask->state == ISCSI_TASK_ABORTING) 670 goto done; 671 672 __iscsi_get_ctask(ctask); 673 spin_unlock_bh(&conn->session->lock); 674 rc = conn->session->tt->xmit_cmd_task(conn, ctask); 675 spin_lock_bh(&conn->session->lock); 676 __iscsi_put_ctask(ctask); 677 678 done: 679 if (!rc) 680 /* done with this ctask */ 681 conn->ctask = NULL; 682 return rc; 683 } 684 685 /** 686 * iscsi_data_xmit - xmit any command into the scheduled connection 687 * @conn: iscsi connection 688 * 689 * Notes: 690 * The function can return -EAGAIN in which case the caller must 691 * re-schedule it again later or recover. '0' return code means 692 * successful xmit. 693 **/ 694 static int iscsi_data_xmit(struct iscsi_conn *conn) 695 { 696 int rc = 0; 697 698 spin_lock_bh(&conn->session->lock); 699 if (unlikely(conn->suspend_tx)) { 700 debug_scsi("conn %d Tx suspended!\n", conn->id); 701 spin_unlock_bh(&conn->session->lock); 702 return -ENODATA; 703 } 704 705 if (conn->ctask) { 706 rc = iscsi_xmit_ctask(conn); 707 if (rc) 708 goto again; 709 } 710 711 if (conn->mtask) { 712 rc = iscsi_xmit_mtask(conn); 713 if (rc) 714 goto again; 715 } 716 717 /* 718 * process mgmt pdus like nops before commands since we should 719 * only have one nop-out as a ping from us and targets should not 720 * overflow us with nop-ins 721 */ 722 check_mgmt: 723 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask, 724 sizeof(void*))) { 725 iscsi_prep_mtask(conn, conn->mtask); 726 list_add_tail(&conn->mtask->running, &conn->mgmt_run_list); 727 rc = iscsi_xmit_mtask(conn); 728 if (rc) 729 goto again; 730 } 731 732 /* process command queue */ 733 while (!list_empty(&conn->xmitqueue)) { 734 /* 735 * iscsi tcp may readd the task to the xmitqueue to send 736 * write data 737 */ 738 conn->ctask = list_entry(conn->xmitqueue.next, 739 struct iscsi_cmd_task, running); 740 if (conn->ctask->state == ISCSI_TASK_PENDING) { 741 iscsi_prep_scsi_cmd_pdu(conn->ctask); 742 conn->session->tt->init_cmd_task(conn->ctask); 743 } 744 conn->ctask->state = ISCSI_TASK_RUNNING; 745 list_move_tail(conn->xmitqueue.next, &conn->run_list); 746 rc = iscsi_xmit_ctask(conn); 747 if (rc) 748 goto again; 749 /* 750 * we could continuously get new ctask requests so 751 * we need to check the mgmt queue for nops that need to 752 * be sent to aviod starvation 753 */ 754 if (__kfifo_len(conn->mgmtqueue)) 755 goto check_mgmt; 756 } 757 spin_unlock_bh(&conn->session->lock); 758 return -ENODATA; 759 760 again: 761 if (unlikely(conn->suspend_tx)) 762 rc = -ENODATA; 763 spin_unlock_bh(&conn->session->lock); 764 return rc; 765 } 766 767 static void iscsi_xmitworker(struct work_struct *work) 768 { 769 struct iscsi_conn *conn = 770 container_of(work, struct iscsi_conn, xmitwork); 771 int rc; 772 /* 773 * serialize Xmit worker on a per-connection basis. 774 */ 775 do { 776 rc = iscsi_data_xmit(conn); 777 } while (rc >= 0 || rc == -EAGAIN); 778 } 779 780 enum { 781 FAILURE_BAD_HOST = 1, 782 FAILURE_SESSION_FAILED, 783 FAILURE_SESSION_FREED, 784 FAILURE_WINDOW_CLOSED, 785 FAILURE_OOM, 786 FAILURE_SESSION_TERMINATE, 787 FAILURE_SESSION_IN_RECOVERY, 788 FAILURE_SESSION_RECOVERY_TIMEOUT, 789 }; 790 791 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) 792 { 793 struct Scsi_Host *host; 794 int reason = 0; 795 struct iscsi_session *session; 796 struct iscsi_conn *conn; 797 struct iscsi_cmd_task *ctask = NULL; 798 799 sc->scsi_done = done; 800 sc->result = 0; 801 sc->SCp.ptr = NULL; 802 803 host = sc->device->host; 804 session = iscsi_hostdata(host->hostdata); 805 806 spin_lock(&session->lock); 807 808 /* 809 * ISCSI_STATE_FAILED is a temp. state. The recovery 810 * code will decide what is best to do with command queued 811 * during this time 812 */ 813 if (session->state != ISCSI_STATE_LOGGED_IN && 814 session->state != ISCSI_STATE_FAILED) { 815 /* 816 * to handle the race between when we set the recovery state 817 * and block the session we requeue here (commands could 818 * be entering our queuecommand while a block is starting 819 * up because the block code is not locked) 820 */ 821 if (session->state == ISCSI_STATE_IN_RECOVERY) { 822 reason = FAILURE_SESSION_IN_RECOVERY; 823 goto reject; 824 } 825 826 if (session->state == ISCSI_STATE_RECOVERY_FAILED) 827 reason = FAILURE_SESSION_RECOVERY_TIMEOUT; 828 else if (session->state == ISCSI_STATE_TERMINATE) 829 reason = FAILURE_SESSION_TERMINATE; 830 else 831 reason = FAILURE_SESSION_FREED; 832 goto fault; 833 } 834 835 conn = session->leadconn; 836 if (!conn) { 837 reason = FAILURE_SESSION_FREED; 838 goto fault; 839 } 840 841 if (iscsi_check_cmdsn_window_closed(conn)) { 842 reason = FAILURE_WINDOW_CLOSED; 843 goto reject; 844 } 845 846 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask, 847 sizeof(void*))) { 848 reason = FAILURE_OOM; 849 goto reject; 850 } 851 session->queued_cmdsn++; 852 853 sc->SCp.phase = session->age; 854 sc->SCp.ptr = (char *)ctask; 855 856 atomic_set(&ctask->refcount, 1); 857 ctask->state = ISCSI_TASK_PENDING; 858 ctask->mtask = NULL; 859 ctask->conn = conn; 860 ctask->sc = sc; 861 INIT_LIST_HEAD(&ctask->running); 862 863 list_add_tail(&ctask->running, &conn->xmitqueue); 864 spin_unlock(&session->lock); 865 866 scsi_queue_work(host, &conn->xmitwork); 867 return 0; 868 869 reject: 870 spin_unlock(&session->lock); 871 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); 872 return SCSI_MLQUEUE_HOST_BUSY; 873 874 fault: 875 spin_unlock(&session->lock); 876 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n", 877 sc->cmnd[0], reason); 878 sc->result = (DID_NO_CONNECT << 16); 879 scsi_set_resid(sc, scsi_bufflen(sc)); 880 sc->scsi_done(sc); 881 return 0; 882 } 883 EXPORT_SYMBOL_GPL(iscsi_queuecommand); 884 885 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) 886 { 887 if (depth > ISCSI_MAX_CMD_PER_LUN) 888 depth = ISCSI_MAX_CMD_PER_LUN; 889 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 890 return sdev->queue_depth; 891 } 892 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); 893 894 static struct iscsi_mgmt_task * 895 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 896 char *data, uint32_t data_size) 897 { 898 struct iscsi_session *session = conn->session; 899 struct iscsi_mgmt_task *mtask; 900 901 if (session->state == ISCSI_STATE_TERMINATE) 902 return NULL; 903 904 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || 905 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) 906 /* 907 * Login and Text are sent serially, in 908 * request-followed-by-response sequence. 909 * Same mtask can be used. Same ITT must be used. 910 * Note that login_mtask is preallocated at conn_create(). 911 */ 912 mtask = conn->login_mtask; 913 else { 914 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); 915 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); 916 917 if (!__kfifo_get(session->mgmtpool.queue, 918 (void*)&mtask, sizeof(void*))) 919 return NULL; 920 } 921 922 if (data_size) { 923 memcpy(mtask->data, data, data_size); 924 mtask->data_count = data_size; 925 } else 926 mtask->data_count = 0; 927 928 INIT_LIST_HEAD(&mtask->running); 929 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr)); 930 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*)); 931 return mtask; 932 } 933 934 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, 935 char *data, uint32_t data_size) 936 { 937 struct iscsi_conn *conn = cls_conn->dd_data; 938 struct iscsi_session *session = conn->session; 939 int err = 0; 940 941 spin_lock_bh(&session->lock); 942 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) 943 err = -EPERM; 944 spin_unlock_bh(&session->lock); 945 scsi_queue_work(session->host, &conn->xmitwork); 946 return err; 947 } 948 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); 949 950 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) 951 { 952 struct iscsi_session *session = class_to_transport_session(cls_session); 953 struct iscsi_conn *conn = session->leadconn; 954 955 spin_lock_bh(&session->lock); 956 if (session->state != ISCSI_STATE_LOGGED_IN) { 957 session->state = ISCSI_STATE_RECOVERY_FAILED; 958 if (conn) 959 wake_up(&conn->ehwait); 960 } 961 spin_unlock_bh(&session->lock); 962 } 963 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); 964 965 int iscsi_eh_host_reset(struct scsi_cmnd *sc) 966 { 967 struct Scsi_Host *host = sc->device->host; 968 struct iscsi_session *session = iscsi_hostdata(host->hostdata); 969 struct iscsi_conn *conn = session->leadconn; 970 int fail_session = 0; 971 972 spin_lock_bh(&session->lock); 973 if (session->state == ISCSI_STATE_TERMINATE) { 974 failed: 975 debug_scsi("failing host reset: session terminated " 976 "[CID %d age %d]\n", conn->id, session->age); 977 spin_unlock_bh(&session->lock); 978 return FAILED; 979 } 980 981 if (sc->SCp.phase == session->age) { 982 debug_scsi("failing connection CID %d due to SCSI host reset\n", 983 conn->id); 984 fail_session = 1; 985 } 986 spin_unlock_bh(&session->lock); 987 988 /* 989 * we drop the lock here but the leadconn cannot be destoyed while 990 * we are in the scsi eh 991 */ 992 if (fail_session) 993 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 994 995 debug_scsi("iscsi_eh_host_reset wait for relogin\n"); 996 wait_event_interruptible(conn->ehwait, 997 session->state == ISCSI_STATE_TERMINATE || 998 session->state == ISCSI_STATE_LOGGED_IN || 999 session->state == ISCSI_STATE_RECOVERY_FAILED); 1000 if (signal_pending(current)) 1001 flush_signals(current); 1002 1003 spin_lock_bh(&session->lock); 1004 if (session->state == ISCSI_STATE_LOGGED_IN) 1005 printk(KERN_INFO "iscsi: host reset succeeded\n"); 1006 else 1007 goto failed; 1008 spin_unlock_bh(&session->lock); 1009 1010 return SUCCESS; 1011 } 1012 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset); 1013 1014 static void iscsi_tmabort_timedout(unsigned long data) 1015 { 1016 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data; 1017 struct iscsi_conn *conn = ctask->conn; 1018 struct iscsi_session *session = conn->session; 1019 1020 spin_lock(&session->lock); 1021 if (conn->tmabort_state == TMABORT_INITIAL) { 1022 conn->tmabort_state = TMABORT_TIMEDOUT; 1023 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n", 1024 ctask->sc, ctask->itt); 1025 /* unblock eh_abort() */ 1026 wake_up(&conn->ehwait); 1027 } 1028 spin_unlock(&session->lock); 1029 } 1030 1031 static int iscsi_exec_abort_task(struct scsi_cmnd *sc, 1032 struct iscsi_cmd_task *ctask) 1033 { 1034 struct iscsi_conn *conn = ctask->conn; 1035 struct iscsi_session *session = conn->session; 1036 struct iscsi_tm *hdr = &conn->tmhdr; 1037 1038 /* 1039 * ctask timed out but session is OK requests must be serialized. 1040 */ 1041 memset(hdr, 0, sizeof(struct iscsi_tm)); 1042 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 1043 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; 1044 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 1045 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); 1046 hdr->rtt = ctask->hdr->itt; 1047 hdr->refcmdsn = ctask->hdr->cmdsn; 1048 1049 ctask->mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, 1050 NULL, 0); 1051 if (!ctask->mtask) { 1052 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 1053 debug_scsi("abort sent failure [itt 0x%x]\n", ctask->itt); 1054 return -EPERM; 1055 } 1056 ctask->state = ISCSI_TASK_ABORTING; 1057 1058 debug_scsi("abort sent [itt 0x%x]\n", ctask->itt); 1059 1060 if (conn->tmabort_state == TMABORT_INITIAL) { 1061 conn->tmfcmd_pdus_cnt++; 1062 conn->tmabort_timer.expires = 20*HZ + jiffies; 1063 conn->tmabort_timer.function = iscsi_tmabort_timedout; 1064 conn->tmabort_timer.data = (unsigned long)ctask; 1065 add_timer(&conn->tmabort_timer); 1066 debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt); 1067 } 1068 spin_unlock_bh(&session->lock); 1069 scsi_queue_work(session->host, &conn->xmitwork); 1070 1071 /* 1072 * block eh thread until: 1073 * 1074 * 1) abort response 1075 * 2) abort timeout 1076 * 3) session is terminated or restarted or userspace has 1077 * given up on recovery 1078 */ 1079 wait_event_interruptible(conn->ehwait, 1080 sc->SCp.phase != session->age || 1081 session->state != ISCSI_STATE_LOGGED_IN || 1082 conn->tmabort_state != TMABORT_INITIAL); 1083 if (signal_pending(current)) 1084 flush_signals(current); 1085 del_timer_sync(&conn->tmabort_timer); 1086 spin_lock_bh(&session->lock); 1087 return 0; 1088 } 1089 1090 /* 1091 * session lock must be held 1092 */ 1093 static struct iscsi_mgmt_task * 1094 iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt) 1095 { 1096 int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*); 1097 struct iscsi_mgmt_task *task; 1098 1099 debug_scsi("searching %d tasks\n", nr_tasks); 1100 1101 for (i = 0; i < nr_tasks; i++) { 1102 __kfifo_get(fifo, (void*)&task, sizeof(void*)); 1103 debug_scsi("check task %u\n", task->itt); 1104 1105 if (task->itt == itt) { 1106 debug_scsi("matched task\n"); 1107 return task; 1108 } 1109 1110 __kfifo_put(fifo, (void*)&task, sizeof(void*)); 1111 } 1112 return NULL; 1113 } 1114 1115 static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask) 1116 { 1117 struct iscsi_conn *conn = ctask->conn; 1118 struct iscsi_session *session = conn->session; 1119 1120 if (!ctask->mtask) 1121 return -EINVAL; 1122 1123 if (!iscsi_remove_mgmt_task(conn->mgmtqueue, ctask->mtask->itt)) 1124 list_del(&ctask->mtask->running); 1125 __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask, 1126 sizeof(void*)); 1127 ctask->mtask = NULL; 1128 return 0; 1129 } 1130 1131 /* 1132 * session lock must be held 1133 */ 1134 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, 1135 int err) 1136 { 1137 struct scsi_cmnd *sc; 1138 1139 sc = ctask->sc; 1140 if (!sc) 1141 return; 1142 1143 if (ctask->state == ISCSI_TASK_PENDING) 1144 /* 1145 * cmd never made it to the xmit thread, so we should not count 1146 * the cmd in the sequencing 1147 */ 1148 conn->session->queued_cmdsn--; 1149 else 1150 conn->session->tt->cleanup_cmd_task(conn, ctask); 1151 iscsi_ctask_mtask_cleanup(ctask); 1152 1153 sc->result = err; 1154 scsi_set_resid(sc, scsi_bufflen(sc)); 1155 if (conn->ctask == ctask) 1156 conn->ctask = NULL; 1157 /* release ref from queuecommand */ 1158 __iscsi_put_ctask(ctask); 1159 } 1160 1161 int iscsi_eh_abort(struct scsi_cmnd *sc) 1162 { 1163 struct iscsi_cmd_task *ctask; 1164 struct iscsi_conn *conn; 1165 struct iscsi_session *session; 1166 int rc; 1167 1168 /* 1169 * if session was ISCSI_STATE_IN_RECOVERY then we may not have 1170 * got the command. 1171 */ 1172 if (!sc->SCp.ptr) { 1173 debug_scsi("sc never reached iscsi layer or it completed.\n"); 1174 return SUCCESS; 1175 } 1176 1177 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; 1178 conn = ctask->conn; 1179 session = conn->session; 1180 1181 conn->eh_abort_cnt++; 1182 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); 1183 1184 spin_lock_bh(&session->lock); 1185 1186 /* 1187 * If we are not logged in or we have started a new session 1188 * then let the host reset code handle this 1189 */ 1190 if (session->state != ISCSI_STATE_LOGGED_IN || 1191 sc->SCp.phase != session->age) 1192 goto failed; 1193 1194 /* ctask completed before time out */ 1195 if (!ctask->sc) { 1196 debug_scsi("sc completed while abort in progress\n"); 1197 goto success; 1198 } 1199 1200 /* what should we do here ? */ 1201 if (conn->ctask == ctask) { 1202 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. " 1203 "Failing abort\n", sc, ctask->itt); 1204 goto failed; 1205 } 1206 1207 if (ctask->state == ISCSI_TASK_PENDING) { 1208 fail_command(conn, ctask, DID_ABORT << 16); 1209 goto success; 1210 } 1211 1212 conn->tmabort_state = TMABORT_INITIAL; 1213 rc = iscsi_exec_abort_task(sc, ctask); 1214 if (rc || sc->SCp.phase != session->age || 1215 session->state != ISCSI_STATE_LOGGED_IN) 1216 goto failed; 1217 iscsi_ctask_mtask_cleanup(ctask); 1218 1219 switch (conn->tmabort_state) { 1220 case TMABORT_SUCCESS: 1221 spin_unlock_bh(&session->lock); 1222 /* 1223 * clean up task if aborted. grab the recv lock as a writer 1224 */ 1225 write_lock_bh(conn->recv_lock); 1226 spin_lock(&session->lock); 1227 fail_command(conn, ctask, DID_ABORT << 16); 1228 spin_unlock(&session->lock); 1229 write_unlock_bh(conn->recv_lock); 1230 /* 1231 * make sure xmit thread is not still touching the 1232 * ctask/scsi_cmnd 1233 */ 1234 scsi_flush_work(session->host); 1235 goto success_unlocked; 1236 case TMABORT_NOT_FOUND: 1237 if (!ctask->sc) { 1238 /* ctask completed before tmf abort response */ 1239 debug_scsi("sc completed while abort in progress\n"); 1240 goto success; 1241 } 1242 /* fall through */ 1243 default: 1244 /* timedout or failed */ 1245 spin_unlock_bh(&session->lock); 1246 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 1247 goto failed_unlocked; 1248 } 1249 1250 success: 1251 spin_unlock_bh(&session->lock); 1252 success_unlocked: 1253 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); 1254 return SUCCESS; 1255 1256 failed: 1257 spin_unlock_bh(&session->lock); 1258 failed_unlocked: 1259 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); 1260 return FAILED; 1261 } 1262 EXPORT_SYMBOL_GPL(iscsi_eh_abort); 1263 1264 int 1265 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) 1266 { 1267 int i; 1268 1269 *items = kmalloc(max * sizeof(void*), GFP_KERNEL); 1270 if (*items == NULL) 1271 return -ENOMEM; 1272 1273 q->max = max; 1274 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL); 1275 if (q->pool == NULL) { 1276 kfree(*items); 1277 return -ENOMEM; 1278 } 1279 1280 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), 1281 GFP_KERNEL, NULL); 1282 if (q->queue == ERR_PTR(-ENOMEM)) { 1283 kfree(q->pool); 1284 kfree(*items); 1285 return -ENOMEM; 1286 } 1287 1288 for (i = 0; i < max; i++) { 1289 q->pool[i] = kmalloc(item_size, GFP_KERNEL); 1290 if (q->pool[i] == NULL) { 1291 int j; 1292 1293 for (j = 0; j < i; j++) 1294 kfree(q->pool[j]); 1295 1296 kfifo_free(q->queue); 1297 kfree(q->pool); 1298 kfree(*items); 1299 return -ENOMEM; 1300 } 1301 memset(q->pool[i], 0, item_size); 1302 (*items)[i] = q->pool[i]; 1303 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); 1304 } 1305 return 0; 1306 } 1307 EXPORT_SYMBOL_GPL(iscsi_pool_init); 1308 1309 void iscsi_pool_free(struct iscsi_queue *q, void **items) 1310 { 1311 int i; 1312 1313 for (i = 0; i < q->max; i++) 1314 kfree(items[i]); 1315 kfree(q->pool); 1316 kfree(items); 1317 } 1318 EXPORT_SYMBOL_GPL(iscsi_pool_free); 1319 1320 /* 1321 * iSCSI Session's hostdata organization: 1322 * 1323 * *------------------* <== hostdata_session(host->hostdata) 1324 * | ptr to class sess| 1325 * |------------------| <== iscsi_hostdata(host->hostdata) 1326 * | iscsi_session | 1327 * *------------------* 1328 */ 1329 1330 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \ 1331 _sz % sizeof(unsigned long)) 1332 1333 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) 1334 1335 /** 1336 * iscsi_session_setup - create iscsi cls session and host and session 1337 * @scsit: scsi transport template 1338 * @iscsit: iscsi transport template 1339 * @cmds_max: scsi host can queue 1340 * @qdepth: scsi host cmds per lun 1341 * @cmd_task_size: LLD ctask private data size 1342 * @mgmt_task_size: LLD mtask private data size 1343 * @initial_cmdsn: initial CmdSN 1344 * @hostno: host no allocated 1345 * 1346 * This can be used by software iscsi_transports that allocate 1347 * a session per scsi host. 1348 **/ 1349 struct iscsi_cls_session * 1350 iscsi_session_setup(struct iscsi_transport *iscsit, 1351 struct scsi_transport_template *scsit, 1352 uint16_t cmds_max, uint16_t qdepth, 1353 int cmd_task_size, int mgmt_task_size, 1354 uint32_t initial_cmdsn, uint32_t *hostno) 1355 { 1356 struct Scsi_Host *shost; 1357 struct iscsi_session *session; 1358 struct iscsi_cls_session *cls_session; 1359 int cmd_i; 1360 1361 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) { 1362 if (qdepth != 0) 1363 printk(KERN_ERR "iscsi: invalid queue depth of %d. " 1364 "Queue depth must be between 1 and %d.\n", 1365 qdepth, ISCSI_MAX_CMD_PER_LUN); 1366 qdepth = ISCSI_DEF_CMD_PER_LUN; 1367 } 1368 1369 if (cmds_max < 2 || (cmds_max & (cmds_max - 1)) || 1370 cmds_max >= ISCSI_MGMT_ITT_OFFSET) { 1371 if (cmds_max != 0) 1372 printk(KERN_ERR "iscsi: invalid can_queue of %d. " 1373 "can_queue must be a power of 2 and between " 1374 "2 and %d - setting to %d.\n", cmds_max, 1375 ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX); 1376 cmds_max = ISCSI_DEF_XMIT_CMDS_MAX; 1377 } 1378 1379 shost = scsi_host_alloc(iscsit->host_template, 1380 hostdata_privsize(sizeof(*session))); 1381 if (!shost) 1382 return NULL; 1383 1384 /* the iscsi layer takes one task for reserve */ 1385 shost->can_queue = cmds_max - 1; 1386 shost->cmd_per_lun = qdepth; 1387 shost->max_id = 1; 1388 shost->max_channel = 0; 1389 shost->max_lun = iscsit->max_lun; 1390 shost->max_cmd_len = iscsit->max_cmd_len; 1391 shost->transportt = scsit; 1392 shost->transportt->create_work_queue = 1; 1393 *hostno = shost->host_no; 1394 1395 session = iscsi_hostdata(shost->hostdata); 1396 memset(session, 0, sizeof(struct iscsi_session)); 1397 session->host = shost; 1398 session->state = ISCSI_STATE_FREE; 1399 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; 1400 session->cmds_max = cmds_max; 1401 session->queued_cmdsn = session->cmdsn = initial_cmdsn; 1402 session->exp_cmdsn = initial_cmdsn + 1; 1403 session->max_cmdsn = initial_cmdsn + 1; 1404 session->max_r2t = 1; 1405 session->tt = iscsit; 1406 1407 /* initialize SCSI PDU commands pool */ 1408 if (iscsi_pool_init(&session->cmdpool, session->cmds_max, 1409 (void***)&session->cmds, 1410 cmd_task_size + sizeof(struct iscsi_cmd_task))) 1411 goto cmdpool_alloc_fail; 1412 1413 /* pre-format cmds pool with ITT */ 1414 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { 1415 struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; 1416 1417 if (cmd_task_size) 1418 ctask->dd_data = &ctask[1]; 1419 ctask->itt = cmd_i; 1420 INIT_LIST_HEAD(&ctask->running); 1421 } 1422 1423 spin_lock_init(&session->lock); 1424 1425 /* initialize immediate command pool */ 1426 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, 1427 (void***)&session->mgmt_cmds, 1428 mgmt_task_size + sizeof(struct iscsi_mgmt_task))) 1429 goto mgmtpool_alloc_fail; 1430 1431 1432 /* pre-format immediate cmds pool with ITT */ 1433 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { 1434 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; 1435 1436 if (mgmt_task_size) 1437 mtask->dd_data = &mtask[1]; 1438 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; 1439 INIT_LIST_HEAD(&mtask->running); 1440 } 1441 1442 if (scsi_add_host(shost, NULL)) 1443 goto add_host_fail; 1444 1445 if (!try_module_get(iscsit->owner)) 1446 goto cls_session_fail; 1447 1448 cls_session = iscsi_create_session(shost, iscsit, 0); 1449 if (!cls_session) 1450 goto module_put; 1451 *(unsigned long*)shost->hostdata = (unsigned long)cls_session; 1452 1453 return cls_session; 1454 1455 module_put: 1456 module_put(iscsit->owner); 1457 cls_session_fail: 1458 scsi_remove_host(shost); 1459 add_host_fail: 1460 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); 1461 mgmtpool_alloc_fail: 1462 iscsi_pool_free(&session->cmdpool, (void**)session->cmds); 1463 cmdpool_alloc_fail: 1464 scsi_host_put(shost); 1465 return NULL; 1466 } 1467 EXPORT_SYMBOL_GPL(iscsi_session_setup); 1468 1469 /** 1470 * iscsi_session_teardown - destroy session, host, and cls_session 1471 * shost: scsi host 1472 * 1473 * This can be used by software iscsi_transports that allocate 1474 * a session per scsi host. 1475 **/ 1476 void iscsi_session_teardown(struct iscsi_cls_session *cls_session) 1477 { 1478 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 1479 struct iscsi_session *session = iscsi_hostdata(shost->hostdata); 1480 struct module *owner = cls_session->transport->owner; 1481 1482 iscsi_unblock_session(cls_session); 1483 scsi_remove_host(shost); 1484 1485 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); 1486 iscsi_pool_free(&session->cmdpool, (void**)session->cmds); 1487 1488 kfree(session->password); 1489 kfree(session->password_in); 1490 kfree(session->username); 1491 kfree(session->username_in); 1492 kfree(session->targetname); 1493 kfree(session->netdev); 1494 kfree(session->hwaddress); 1495 kfree(session->initiatorname); 1496 1497 iscsi_destroy_session(cls_session); 1498 scsi_host_put(shost); 1499 module_put(owner); 1500 } 1501 EXPORT_SYMBOL_GPL(iscsi_session_teardown); 1502 1503 /** 1504 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn 1505 * @cls_session: iscsi_cls_session 1506 * @conn_idx: cid 1507 **/ 1508 struct iscsi_cls_conn * 1509 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 1510 { 1511 struct iscsi_session *session = class_to_transport_session(cls_session); 1512 struct iscsi_conn *conn; 1513 struct iscsi_cls_conn *cls_conn; 1514 char *data; 1515 1516 cls_conn = iscsi_create_conn(cls_session, conn_idx); 1517 if (!cls_conn) 1518 return NULL; 1519 conn = cls_conn->dd_data; 1520 memset(conn, 0, sizeof(*conn)); 1521 1522 conn->session = session; 1523 conn->cls_conn = cls_conn; 1524 conn->c_stage = ISCSI_CONN_INITIAL_STAGE; 1525 conn->id = conn_idx; 1526 conn->exp_statsn = 0; 1527 conn->tmabort_state = TMABORT_INITIAL; 1528 INIT_LIST_HEAD(&conn->run_list); 1529 INIT_LIST_HEAD(&conn->mgmt_run_list); 1530 INIT_LIST_HEAD(&conn->xmitqueue); 1531 1532 /* initialize general immediate & non-immediate PDU commands queue */ 1533 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), 1534 GFP_KERNEL, NULL); 1535 if (conn->mgmtqueue == ERR_PTR(-ENOMEM)) 1536 goto mgmtqueue_alloc_fail; 1537 1538 INIT_WORK(&conn->xmitwork, iscsi_xmitworker); 1539 1540 /* allocate login_mtask used for the login/text sequences */ 1541 spin_lock_bh(&session->lock); 1542 if (!__kfifo_get(session->mgmtpool.queue, 1543 (void*)&conn->login_mtask, 1544 sizeof(void*))) { 1545 spin_unlock_bh(&session->lock); 1546 goto login_mtask_alloc_fail; 1547 } 1548 spin_unlock_bh(&session->lock); 1549 1550 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL); 1551 if (!data) 1552 goto login_mtask_data_alloc_fail; 1553 conn->login_mtask->data = conn->data = data; 1554 1555 init_timer(&conn->tmabort_timer); 1556 init_waitqueue_head(&conn->ehwait); 1557 1558 return cls_conn; 1559 1560 login_mtask_data_alloc_fail: 1561 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, 1562 sizeof(void*)); 1563 login_mtask_alloc_fail: 1564 kfifo_free(conn->mgmtqueue); 1565 mgmtqueue_alloc_fail: 1566 iscsi_destroy_conn(cls_conn); 1567 return NULL; 1568 } 1569 EXPORT_SYMBOL_GPL(iscsi_conn_setup); 1570 1571 /** 1572 * iscsi_conn_teardown - teardown iscsi connection 1573 * cls_conn: iscsi class connection 1574 * 1575 * TODO: we may need to make this into a two step process 1576 * like scsi-mls remove + put host 1577 */ 1578 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) 1579 { 1580 struct iscsi_conn *conn = cls_conn->dd_data; 1581 struct iscsi_session *session = conn->session; 1582 unsigned long flags; 1583 1584 spin_lock_bh(&session->lock); 1585 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1586 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; 1587 if (session->leadconn == conn) { 1588 /* 1589 * leading connection? then give up on recovery. 1590 */ 1591 session->state = ISCSI_STATE_TERMINATE; 1592 wake_up(&conn->ehwait); 1593 } 1594 spin_unlock_bh(&session->lock); 1595 1596 /* 1597 * Block until all in-progress commands for this connection 1598 * time out or fail. 1599 */ 1600 for (;;) { 1601 spin_lock_irqsave(session->host->host_lock, flags); 1602 if (!session->host->host_busy) { /* OK for ERL == 0 */ 1603 spin_unlock_irqrestore(session->host->host_lock, flags); 1604 break; 1605 } 1606 spin_unlock_irqrestore(session->host->host_lock, flags); 1607 msleep_interruptible(500); 1608 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d " 1609 "host_failed %d\n", session->host->host_busy, 1610 session->host->host_failed); 1611 /* 1612 * force eh_abort() to unblock 1613 */ 1614 wake_up(&conn->ehwait); 1615 } 1616 1617 /* flush queued up work because we free the connection below */ 1618 scsi_flush_work(session->host); 1619 1620 spin_lock_bh(&session->lock); 1621 kfree(conn->data); 1622 kfree(conn->persistent_address); 1623 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, 1624 sizeof(void*)); 1625 if (session->leadconn == conn) 1626 session->leadconn = NULL; 1627 spin_unlock_bh(&session->lock); 1628 1629 kfifo_free(conn->mgmtqueue); 1630 1631 iscsi_destroy_conn(cls_conn); 1632 } 1633 EXPORT_SYMBOL_GPL(iscsi_conn_teardown); 1634 1635 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) 1636 { 1637 struct iscsi_conn *conn = cls_conn->dd_data; 1638 struct iscsi_session *session = conn->session; 1639 1640 if (!session) { 1641 printk(KERN_ERR "iscsi: can't start unbound connection\n"); 1642 return -EPERM; 1643 } 1644 1645 if ((session->imm_data_en || !session->initial_r2t_en) && 1646 session->first_burst > session->max_burst) { 1647 printk("iscsi: invalid burst lengths: " 1648 "first_burst %d max_burst %d\n", 1649 session->first_burst, session->max_burst); 1650 return -EINVAL; 1651 } 1652 1653 spin_lock_bh(&session->lock); 1654 conn->c_stage = ISCSI_CONN_STARTED; 1655 session->state = ISCSI_STATE_LOGGED_IN; 1656 session->queued_cmdsn = session->cmdsn; 1657 1658 switch(conn->stop_stage) { 1659 case STOP_CONN_RECOVER: 1660 /* 1661 * unblock eh_abort() if it is blocked. re-try all 1662 * commands after successful recovery 1663 */ 1664 conn->stop_stage = 0; 1665 conn->tmabort_state = TMABORT_INITIAL; 1666 session->age++; 1667 spin_unlock_bh(&session->lock); 1668 1669 iscsi_unblock_session(session_to_cls(session)); 1670 wake_up(&conn->ehwait); 1671 return 0; 1672 case STOP_CONN_TERM: 1673 conn->stop_stage = 0; 1674 break; 1675 default: 1676 break; 1677 } 1678 spin_unlock_bh(&session->lock); 1679 1680 return 0; 1681 } 1682 EXPORT_SYMBOL_GPL(iscsi_conn_start); 1683 1684 static void 1685 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) 1686 { 1687 struct iscsi_mgmt_task *mtask, *tmp; 1688 1689 /* handle pending */ 1690 while (__kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) { 1691 if (mtask == conn->login_mtask) 1692 continue; 1693 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt); 1694 __kfifo_put(session->mgmtpool.queue, (void*)&mtask, 1695 sizeof(void*)); 1696 } 1697 1698 /* handle running */ 1699 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) { 1700 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt); 1701 list_del(&mtask->running); 1702 1703 if (mtask == conn->login_mtask) 1704 continue; 1705 __kfifo_put(session->mgmtpool.queue, (void*)&mtask, 1706 sizeof(void*)); 1707 } 1708 1709 conn->mtask = NULL; 1710 } 1711 1712 /* Fail commands. Mutex and session lock held and recv side suspended */ 1713 static void fail_all_commands(struct iscsi_conn *conn) 1714 { 1715 struct iscsi_cmd_task *ctask, *tmp; 1716 1717 /* flush pending */ 1718 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) { 1719 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc, 1720 ctask->itt); 1721 fail_command(conn, ctask, DID_BUS_BUSY << 16); 1722 } 1723 1724 /* fail all other running */ 1725 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { 1726 debug_scsi("failing in progress sc %p itt 0x%x\n", 1727 ctask->sc, ctask->itt); 1728 fail_command(conn, ctask, DID_BUS_BUSY << 16); 1729 } 1730 1731 conn->ctask = NULL; 1732 } 1733 1734 static void iscsi_start_session_recovery(struct iscsi_session *session, 1735 struct iscsi_conn *conn, int flag) 1736 { 1737 int old_stop_stage; 1738 1739 spin_lock_bh(&session->lock); 1740 if (conn->stop_stage == STOP_CONN_TERM) { 1741 spin_unlock_bh(&session->lock); 1742 return; 1743 } 1744 1745 /* 1746 * When this is called for the in_login state, we only want to clean 1747 * up the login task and connection. We do not need to block and set 1748 * the recovery state again 1749 */ 1750 if (flag == STOP_CONN_TERM) 1751 session->state = ISCSI_STATE_TERMINATE; 1752 else if (conn->stop_stage != STOP_CONN_RECOVER) 1753 session->state = ISCSI_STATE_IN_RECOVERY; 1754 1755 old_stop_stage = conn->stop_stage; 1756 conn->stop_stage = flag; 1757 conn->c_stage = ISCSI_CONN_STOPPED; 1758 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1759 spin_unlock_bh(&session->lock); 1760 scsi_flush_work(session->host); 1761 1762 write_lock_bh(conn->recv_lock); 1763 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 1764 write_unlock_bh(conn->recv_lock); 1765 1766 /* 1767 * for connection level recovery we should not calculate 1768 * header digest. conn->hdr_size used for optimization 1769 * in hdr_extract() and will be re-negotiated at 1770 * set_param() time. 1771 */ 1772 if (flag == STOP_CONN_RECOVER) { 1773 conn->hdrdgst_en = 0; 1774 conn->datadgst_en = 0; 1775 if (session->state == ISCSI_STATE_IN_RECOVERY && 1776 old_stop_stage != STOP_CONN_RECOVER) { 1777 debug_scsi("blocking session\n"); 1778 iscsi_block_session(session_to_cls(session)); 1779 } 1780 } 1781 1782 /* 1783 * flush queues. 1784 */ 1785 spin_lock_bh(&session->lock); 1786 fail_all_commands(conn); 1787 flush_control_queues(session, conn); 1788 spin_unlock_bh(&session->lock); 1789 } 1790 1791 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 1792 { 1793 struct iscsi_conn *conn = cls_conn->dd_data; 1794 struct iscsi_session *session = conn->session; 1795 1796 switch (flag) { 1797 case STOP_CONN_RECOVER: 1798 case STOP_CONN_TERM: 1799 iscsi_start_session_recovery(session, conn, flag); 1800 break; 1801 default: 1802 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag); 1803 } 1804 } 1805 EXPORT_SYMBOL_GPL(iscsi_conn_stop); 1806 1807 int iscsi_conn_bind(struct iscsi_cls_session *cls_session, 1808 struct iscsi_cls_conn *cls_conn, int is_leading) 1809 { 1810 struct iscsi_session *session = class_to_transport_session(cls_session); 1811 struct iscsi_conn *conn = cls_conn->dd_data; 1812 1813 spin_lock_bh(&session->lock); 1814 if (is_leading) 1815 session->leadconn = conn; 1816 spin_unlock_bh(&session->lock); 1817 1818 /* 1819 * Unblock xmitworker(), Login Phase will pass through. 1820 */ 1821 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 1822 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1823 return 0; 1824 } 1825 EXPORT_SYMBOL_GPL(iscsi_conn_bind); 1826 1827 1828 int iscsi_set_param(struct iscsi_cls_conn *cls_conn, 1829 enum iscsi_param param, char *buf, int buflen) 1830 { 1831 struct iscsi_conn *conn = cls_conn->dd_data; 1832 struct iscsi_session *session = conn->session; 1833 uint32_t value; 1834 1835 switch(param) { 1836 case ISCSI_PARAM_MAX_RECV_DLENGTH: 1837 sscanf(buf, "%d", &conn->max_recv_dlength); 1838 break; 1839 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 1840 sscanf(buf, "%d", &conn->max_xmit_dlength); 1841 break; 1842 case ISCSI_PARAM_HDRDGST_EN: 1843 sscanf(buf, "%d", &conn->hdrdgst_en); 1844 break; 1845 case ISCSI_PARAM_DATADGST_EN: 1846 sscanf(buf, "%d", &conn->datadgst_en); 1847 break; 1848 case ISCSI_PARAM_INITIAL_R2T_EN: 1849 sscanf(buf, "%d", &session->initial_r2t_en); 1850 break; 1851 case ISCSI_PARAM_MAX_R2T: 1852 sscanf(buf, "%d", &session->max_r2t); 1853 break; 1854 case ISCSI_PARAM_IMM_DATA_EN: 1855 sscanf(buf, "%d", &session->imm_data_en); 1856 break; 1857 case ISCSI_PARAM_FIRST_BURST: 1858 sscanf(buf, "%d", &session->first_burst); 1859 break; 1860 case ISCSI_PARAM_MAX_BURST: 1861 sscanf(buf, "%d", &session->max_burst); 1862 break; 1863 case ISCSI_PARAM_PDU_INORDER_EN: 1864 sscanf(buf, "%d", &session->pdu_inorder_en); 1865 break; 1866 case ISCSI_PARAM_DATASEQ_INORDER_EN: 1867 sscanf(buf, "%d", &session->dataseq_inorder_en); 1868 break; 1869 case ISCSI_PARAM_ERL: 1870 sscanf(buf, "%d", &session->erl); 1871 break; 1872 case ISCSI_PARAM_IFMARKER_EN: 1873 sscanf(buf, "%d", &value); 1874 BUG_ON(value); 1875 break; 1876 case ISCSI_PARAM_OFMARKER_EN: 1877 sscanf(buf, "%d", &value); 1878 BUG_ON(value); 1879 break; 1880 case ISCSI_PARAM_EXP_STATSN: 1881 sscanf(buf, "%u", &conn->exp_statsn); 1882 break; 1883 case ISCSI_PARAM_USERNAME: 1884 kfree(session->username); 1885 session->username = kstrdup(buf, GFP_KERNEL); 1886 if (!session->username) 1887 return -ENOMEM; 1888 break; 1889 case ISCSI_PARAM_USERNAME_IN: 1890 kfree(session->username_in); 1891 session->username_in = kstrdup(buf, GFP_KERNEL); 1892 if (!session->username_in) 1893 return -ENOMEM; 1894 break; 1895 case ISCSI_PARAM_PASSWORD: 1896 kfree(session->password); 1897 session->password = kstrdup(buf, GFP_KERNEL); 1898 if (!session->password) 1899 return -ENOMEM; 1900 break; 1901 case ISCSI_PARAM_PASSWORD_IN: 1902 kfree(session->password_in); 1903 session->password_in = kstrdup(buf, GFP_KERNEL); 1904 if (!session->password_in) 1905 return -ENOMEM; 1906 break; 1907 case ISCSI_PARAM_TARGET_NAME: 1908 /* this should not change between logins */ 1909 if (session->targetname) 1910 break; 1911 1912 session->targetname = kstrdup(buf, GFP_KERNEL); 1913 if (!session->targetname) 1914 return -ENOMEM; 1915 break; 1916 case ISCSI_PARAM_TPGT: 1917 sscanf(buf, "%d", &session->tpgt); 1918 break; 1919 case ISCSI_PARAM_PERSISTENT_PORT: 1920 sscanf(buf, "%d", &conn->persistent_port); 1921 break; 1922 case ISCSI_PARAM_PERSISTENT_ADDRESS: 1923 /* 1924 * this is the address returned in discovery so it should 1925 * not change between logins. 1926 */ 1927 if (conn->persistent_address) 1928 break; 1929 1930 conn->persistent_address = kstrdup(buf, GFP_KERNEL); 1931 if (!conn->persistent_address) 1932 return -ENOMEM; 1933 break; 1934 default: 1935 return -ENOSYS; 1936 } 1937 1938 return 0; 1939 } 1940 EXPORT_SYMBOL_GPL(iscsi_set_param); 1941 1942 int iscsi_session_get_param(struct iscsi_cls_session *cls_session, 1943 enum iscsi_param param, char *buf) 1944 { 1945 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 1946 struct iscsi_session *session = iscsi_hostdata(shost->hostdata); 1947 int len; 1948 1949 switch(param) { 1950 case ISCSI_PARAM_INITIAL_R2T_EN: 1951 len = sprintf(buf, "%d\n", session->initial_r2t_en); 1952 break; 1953 case ISCSI_PARAM_MAX_R2T: 1954 len = sprintf(buf, "%hu\n", session->max_r2t); 1955 break; 1956 case ISCSI_PARAM_IMM_DATA_EN: 1957 len = sprintf(buf, "%d\n", session->imm_data_en); 1958 break; 1959 case ISCSI_PARAM_FIRST_BURST: 1960 len = sprintf(buf, "%u\n", session->first_burst); 1961 break; 1962 case ISCSI_PARAM_MAX_BURST: 1963 len = sprintf(buf, "%u\n", session->max_burst); 1964 break; 1965 case ISCSI_PARAM_PDU_INORDER_EN: 1966 len = sprintf(buf, "%d\n", session->pdu_inorder_en); 1967 break; 1968 case ISCSI_PARAM_DATASEQ_INORDER_EN: 1969 len = sprintf(buf, "%d\n", session->dataseq_inorder_en); 1970 break; 1971 case ISCSI_PARAM_ERL: 1972 len = sprintf(buf, "%d\n", session->erl); 1973 break; 1974 case ISCSI_PARAM_TARGET_NAME: 1975 len = sprintf(buf, "%s\n", session->targetname); 1976 break; 1977 case ISCSI_PARAM_TPGT: 1978 len = sprintf(buf, "%d\n", session->tpgt); 1979 break; 1980 case ISCSI_PARAM_USERNAME: 1981 len = sprintf(buf, "%s\n", session->username); 1982 break; 1983 case ISCSI_PARAM_USERNAME_IN: 1984 len = sprintf(buf, "%s\n", session->username_in); 1985 break; 1986 case ISCSI_PARAM_PASSWORD: 1987 len = sprintf(buf, "%s\n", session->password); 1988 break; 1989 case ISCSI_PARAM_PASSWORD_IN: 1990 len = sprintf(buf, "%s\n", session->password_in); 1991 break; 1992 default: 1993 return -ENOSYS; 1994 } 1995 1996 return len; 1997 } 1998 EXPORT_SYMBOL_GPL(iscsi_session_get_param); 1999 2000 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, 2001 enum iscsi_param param, char *buf) 2002 { 2003 struct iscsi_conn *conn = cls_conn->dd_data; 2004 int len; 2005 2006 switch(param) { 2007 case ISCSI_PARAM_MAX_RECV_DLENGTH: 2008 len = sprintf(buf, "%u\n", conn->max_recv_dlength); 2009 break; 2010 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 2011 len = sprintf(buf, "%u\n", conn->max_xmit_dlength); 2012 break; 2013 case ISCSI_PARAM_HDRDGST_EN: 2014 len = sprintf(buf, "%d\n", conn->hdrdgst_en); 2015 break; 2016 case ISCSI_PARAM_DATADGST_EN: 2017 len = sprintf(buf, "%d\n", conn->datadgst_en); 2018 break; 2019 case ISCSI_PARAM_IFMARKER_EN: 2020 len = sprintf(buf, "%d\n", conn->ifmarker_en); 2021 break; 2022 case ISCSI_PARAM_OFMARKER_EN: 2023 len = sprintf(buf, "%d\n", conn->ofmarker_en); 2024 break; 2025 case ISCSI_PARAM_EXP_STATSN: 2026 len = sprintf(buf, "%u\n", conn->exp_statsn); 2027 break; 2028 case ISCSI_PARAM_PERSISTENT_PORT: 2029 len = sprintf(buf, "%d\n", conn->persistent_port); 2030 break; 2031 case ISCSI_PARAM_PERSISTENT_ADDRESS: 2032 len = sprintf(buf, "%s\n", conn->persistent_address); 2033 break; 2034 default: 2035 return -ENOSYS; 2036 } 2037 2038 return len; 2039 } 2040 EXPORT_SYMBOL_GPL(iscsi_conn_get_param); 2041 2042 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, 2043 char *buf) 2044 { 2045 struct iscsi_session *session = iscsi_hostdata(shost->hostdata); 2046 int len; 2047 2048 switch (param) { 2049 case ISCSI_HOST_PARAM_NETDEV_NAME: 2050 if (!session->netdev) 2051 len = sprintf(buf, "%s\n", "default"); 2052 else 2053 len = sprintf(buf, "%s\n", session->netdev); 2054 break; 2055 case ISCSI_HOST_PARAM_HWADDRESS: 2056 if (!session->hwaddress) 2057 len = sprintf(buf, "%s\n", "default"); 2058 else 2059 len = sprintf(buf, "%s\n", session->hwaddress); 2060 break; 2061 case ISCSI_HOST_PARAM_INITIATOR_NAME: 2062 if (!session->initiatorname) 2063 len = sprintf(buf, "%s\n", "unknown"); 2064 else 2065 len = sprintf(buf, "%s\n", session->initiatorname); 2066 break; 2067 2068 default: 2069 return -ENOSYS; 2070 } 2071 2072 return len; 2073 } 2074 EXPORT_SYMBOL_GPL(iscsi_host_get_param); 2075 2076 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, 2077 char *buf, int buflen) 2078 { 2079 struct iscsi_session *session = iscsi_hostdata(shost->hostdata); 2080 2081 switch (param) { 2082 case ISCSI_HOST_PARAM_NETDEV_NAME: 2083 if (!session->netdev) 2084 session->netdev = kstrdup(buf, GFP_KERNEL); 2085 break; 2086 case ISCSI_HOST_PARAM_HWADDRESS: 2087 if (!session->hwaddress) 2088 session->hwaddress = kstrdup(buf, GFP_KERNEL); 2089 break; 2090 case ISCSI_HOST_PARAM_INITIATOR_NAME: 2091 if (!session->initiatorname) 2092 session->initiatorname = kstrdup(buf, GFP_KERNEL); 2093 break; 2094 default: 2095 return -ENOSYS; 2096 } 2097 2098 return 0; 2099 } 2100 EXPORT_SYMBOL_GPL(iscsi_host_set_param); 2101 2102 MODULE_AUTHOR("Mike Christie"); 2103 MODULE_DESCRIPTION("iSCSI library functions"); 2104 MODULE_LICENSE("GPL"); 2105