1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2000 by Cisco Systems, Inc. All rights reserved. 23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 * 26 * iSCSI Pseudo HBA Driver 27 */ 28 29 #include <sys/socket.h> /* networking stuff */ 30 #include <sys/t_kuser.h> /* networking stuff */ 31 #include <sys/tihdr.h> /* networking stuff */ 32 #include <sys/strsubr.h> /* networking stuff */ 33 #include <netinet/tcp.h> /* TCP_NODELAY */ 34 #include <sys/socketvar.h> /* _ALLOC_SLEEP */ 35 #include <sys/strsun.h> /* DB_TYPE() */ 36 #include <sys/scsi/generic/sense.h> 37 38 #include "iscsi.h" /* iscsi driver */ 39 #include <sys/iscsi_protocol.h> /* iscsi protocol */ 40 41 #define ISCSI_INI_TASK_TTT 0xffffffff 42 #define ISCSI_CONN_TIEMOUT_DETECT 20 43 44 boolean_t iscsi_io_logging = B_FALSE; 45 46 #define ISCSI_CHECK_SCSI_READ(ICHK_CMD, ICHK_HDR, ICHK_LEN, ICHK_TYPE) \ 47 if (idm_pattern_checking) { \ 48 struct scsi_pkt *pkt = (ICHK_CMD)->cmd_un.scsi.pkt; \ 49 if (((ICHK_HDR)->response == 0) && \ 50 ((ICHK_HDR)->cmd_status == 0) && \ 51 ((pkt->pkt_cdbp[0] == SCMD_READ_G1) || \ 52 (pkt->pkt_cdbp[0] == SCMD_READ_G4) || \ 53 (pkt->pkt_cdbp[0] == SCMD_READ) || \ 54 (pkt->pkt_cdbp[0] == SCMD_READ_G5))) { \ 55 idm_buf_t *idb = (ICHK_CMD)->cmd_un.scsi.ibp_ibuf; \ 56 IDM_BUFPAT_CHECK(idb, ICHK_LEN, ICHK_TYPE); \ 57 } \ 58 } 59 60 /* Size of structure scsi_arq_status without sense data. */ 61 #define ISCSI_ARQ_STATUS_NOSENSE_LEN (sizeof (struct scsi_arq_status) - \ 62 sizeof (struct scsi_extended_sense)) 63 64 /* generic io helpers */ 65 static uint32_t n2h24(uchar_t *ptr); 66 static int iscsi_sna_lt(uint32_t n1, uint32_t n2); 67 void iscsi_update_flow_control(iscsi_sess_t *isp, 68 uint32_t max, uint32_t exp); 69 static iscsi_status_t iscsi_rx_process_scsi_itt_to_icmdp(iscsi_sess_t *isp, 70 idm_conn_t *ic, iscsi_scsi_rsp_hdr_t *ihp, iscsi_cmd_t **icmdp); 71 static iscsi_status_t iscsi_rx_process_itt_to_icmdp(iscsi_sess_t *isp, 72 iscsi_hdr_t *ihp, iscsi_cmd_t **icmdp); 73 static void iscsi_process_rsp_status(iscsi_sess_t *isp, iscsi_conn_t *icp, 74 idm_status_t status); 75 static void iscsi_drop_conn_cleanup(iscsi_conn_t *icp); 76 static boolean_t iscsi_nop_timeout_checks(iscsi_cmd_t *icmdp); 77 /* callbacks from idm */ 78 static idm_pdu_cb_t iscsi_tx_done; 79 80 /* receivers */ 81 static idm_status_t iscsi_rx_process_nop(idm_conn_t *ic, idm_pdu_t *pdu); 82 static idm_status_t iscsi_rx_process_data_rsp(idm_conn_t *ic, 83 idm_pdu_t *pdu); 84 static idm_status_t iscsi_rx_process_cmd_rsp(idm_conn_t *ic, idm_pdu_t *pdu); 85 static idm_status_t iscsi_rx_process_reject_rsp(idm_conn_t *ic, 86 idm_pdu_t *pdu); 87 88 static idm_status_t iscsi_rx_process_rejected_tsk_mgt(idm_conn_t *ic, 89 iscsi_hdr_t *old_ihp); 90 static idm_status_t iscsi_rx_process_task_mgt_rsp(idm_conn_t *ic, 91 idm_pdu_t *pdu); 92 static idm_status_t iscsi_rx_process_logout_rsp(idm_conn_t *ic, 93 idm_pdu_t *pdu); 94 static idm_status_t iscsi_rx_process_async_rsp(idm_conn_t *ic, 95 idm_pdu_t *pdu); 96 static idm_status_t iscsi_rx_process_text_rsp(idm_conn_t *ic, 97 idm_pdu_t *pdu); 98 99 /* senders */ 100 static iscsi_status_t iscsi_tx_scsi(iscsi_sess_t *isp, iscsi_cmd_t *icmdp); 101 static iscsi_status_t iscsi_tx_nop(iscsi_sess_t *isp, iscsi_cmd_t *icmdp); 102 static iscsi_status_t iscsi_tx_abort(iscsi_sess_t *isp, iscsi_cmd_t *icmdp); 103 static iscsi_status_t iscsi_tx_reset(iscsi_sess_t *isp, iscsi_cmd_t *icmdp); 104 static iscsi_status_t iscsi_tx_logout(iscsi_sess_t *isp, iscsi_cmd_t *icmdp); 105 static iscsi_status_t iscsi_tx_text(iscsi_sess_t *isp, iscsi_cmd_t *icmdp); 106 107 108 /* helpers */ 109 static void iscsi_logout_start(void *arg); 110 static void iscsi_handle_passthru_callback(struct scsi_pkt *pkt); 111 static void iscsi_handle_nop(iscsi_conn_t *icp, uint32_t itt, uint32_t ttt); 112 113 static void iscsi_timeout_checks(iscsi_sess_t *isp); 114 static void iscsi_nop_checks(iscsi_sess_t *isp); 115 static boolean_t iscsi_decode_sense(uint8_t *sense_data); 116 static void iscsi_flush_cmd_after_reset(uint32_t cmd_sn, uint16_t lun_num, 117 iscsi_conn_t *icp); 118 119 /* 120 * This file contains the main guts of the iSCSI protocol layer. 121 * It's broken into 5 sections; Basic helper functions, RX IO path, 122 * TX IO path, Completion (IC) IO path, and watchdog (WD) routines. 123 * 124 * The IO flow model is similiar to the below diagram. The 125 * iscsi session, connection and command state machines are used 126 * to drive IO through this flow diagram. Reference those files 127 * to get a detailed description of their respective state models 128 * prior to their xxx_state_machine_function(). 129 * 130 * tran_start() -> CMD_E1 TX_THREAD RX_THREAD 131 * | T T 132 * V T T 133 * PENDING_Q --CMD_E2--> ACTIVE_Q - --CMD_E3--+ 134 * T \ C T | 135 * T \M T | 136 * D T | 137 * WD_THREAD TT|TT T | 138 * /E T | 139 * / 6 T | 140 * ABORTING_Q<- --CMD_E3--+ 141 * T | 142 * T T | 143 * T | 144 * callback() <--CMD_E#-- COMPLETION_Q <------------+ 145 * T 146 * T 147 * IC_THREAD 148 * 149 * External and internal command are ran thru this same state 150 * machine. All commands enter the state machine by receiving an 151 * ISCSI_CMD_EVENT_E1. This event places the command into the 152 * PENDING_Q. Next when resources are available the TX_THREAD 153 * issues a E2 event on the command. This sends the command 154 * to the TCP stack and places the command on the ACTIVE_Q. While 155 * on the PENDIING_Q and ACTIVE_Q, the command is monitored via the 156 * WD_THREAD to ensure the pkt_time has not elapsed. If elapsed the 157 * command is issued an E6(timeout) event which moves either (if pending) 158 * completed the command or (if active) moves the command to the 159 * aborting queue and issues a SCSI TASK MANAGEMENT ABORT command 160 * to cancel the IO request. If the original command is completed 161 * or the TASK MANAGEMENT command completes the command is moved 162 * to the COMPLETION_Q via a E3 event. The IC_THREAD then processes 163 * the COMPLETION_Q and issues the scsi_pkt callback. This 164 * callback can not be processed directly from the RX_THREAD 165 * because the callback might call back into the iscsi driver 166 * causing a deadlock condition. 167 * 168 * For more details on the complete CMD state machine reference 169 * the state machine diagram in iscsi_cmd.c. The connection state 170 * machine is driven via IO events in this file. Then session 171 * events are driven by the connection events. For complete 172 * details on these state machines reference iscsi_sess.c and 173 * iscsi_conn.c 174 */ 175 176 177 /* 178 * +--------------------------------------------------------------------+ 179 * | io helper routines | 180 * +--------------------------------------------------------------------+ 181 */ 182 183 /* 184 * n2h24 - native to host 24 bit integer translation. 185 */ 186 static uint32_t 187 n2h24(uchar_t *ptr) 188 { 189 uint32_t idx; 190 bcopy(ptr, &idx, 3); 191 return (ntohl(idx) >> 8); 192 } 193 194 /* 195 * iscsi_sna_lt - Serial Number Arithmetic, 32 bits, less than, RFC1982 196 */ 197 static int 198 iscsi_sna_lt(uint32_t n1, uint32_t n2) 199 { 200 return ((n1 != n2) && 201 (((n1 < n2) && ((n2 - n1) < ISCSI_SNA32_CHECK)) || 202 ((n1 > n2) && ((n1 - n2) > ISCSI_SNA32_CHECK)))); 203 } 204 205 /* 206 * iscsi_sna_lte - Serial Number Arithmetic, 32 bits, less than or equal, 207 * RFC1982 208 */ 209 int 210 iscsi_sna_lte(uint32_t n1, uint32_t n2) 211 { 212 return ((n1 == n2) || 213 (((n1 < n2) && ((n2 - n1) < ISCSI_SNA32_CHECK)) || 214 ((n1 > n2) && ((n1 - n2) > ISCSI_SNA32_CHECK)))); 215 } 216 217 /* 218 * iscsi_update_flow_control - Update expcmdsn and maxcmdsn iSCSI 219 * flow control information for a session 220 */ 221 void 222 iscsi_update_flow_control(iscsi_sess_t *isp, uint32_t max, uint32_t exp) 223 { 224 ASSERT(isp != NULL); 225 ASSERT(mutex_owned(&isp->sess_cmdsn_mutex)); 226 227 if (!iscsi_sna_lt(max, (exp - 1))) { 228 229 if (!iscsi_sna_lte(exp, isp->sess_expcmdsn)) { 230 isp->sess_expcmdsn = exp; 231 } 232 233 if (!iscsi_sna_lte(max, isp->sess_maxcmdsn)) { 234 isp->sess_maxcmdsn = max; 235 if (iscsi_sna_lte(isp->sess_cmdsn, 236 isp->sess_maxcmdsn)) { 237 /* 238 * the window is open again - schedule 239 * to send any held tasks soon 240 */ 241 iscsi_sess_redrive_io(isp); 242 } 243 } 244 } 245 } 246 247 248 /* 249 * +--------------------------------------------------------------------+ 250 * | io receive and processing routines | 251 * +--------------------------------------------------------------------+ 252 */ 253 254 /* 255 * iscsi_rx_scsi_rsp - called from idm 256 * For each opcode type fan out the processing. 257 */ 258 void 259 iscsi_rx_scsi_rsp(idm_conn_t *ic, idm_pdu_t *pdu) 260 { 261 iscsi_conn_t *icp; 262 iscsi_sess_t *isp; 263 iscsi_hdr_t *ihp; 264 idm_status_t status; 265 266 ASSERT(ic != NULL); 267 ASSERT(pdu != NULL); 268 icp = ic->ic_handle; 269 ASSERT(icp != NULL); 270 ihp = (iscsi_hdr_t *)pdu->isp_hdr; 271 ASSERT(ihp != NULL); 272 isp = icp->conn_sess; 273 ASSERT(isp != NULL); 274 275 /* reset the session timer when we receive the response */ 276 isp->sess_rx_lbolt = icp->conn_rx_lbolt = ddi_get_lbolt(); 277 278 /* fan out the hdr processing */ 279 switch (ihp->opcode & ISCSI_OPCODE_MASK) { 280 case ISCSI_OP_SCSI_DATA_RSP: 281 status = iscsi_rx_process_data_rsp(ic, pdu); 282 break; 283 case ISCSI_OP_SCSI_RSP: 284 status = iscsi_rx_process_cmd_rsp(ic, pdu); 285 idm_pdu_complete(pdu, status); 286 break; 287 default: 288 cmn_err(CE_WARN, "iscsi connection(%u) protocol error - " 289 "received pdu with unsupported opcode 0x%02x", 290 icp->conn_oid, ihp->opcode); 291 status = IDM_STATUS_PROTOCOL_ERROR; 292 } 293 iscsi_process_rsp_status(isp, icp, status); 294 } 295 296 void 297 iscsi_task_cleanup(int opcode, iscsi_cmd_t *icmdp) 298 { 299 struct buf *bp; 300 idm_buf_t *ibp, *obp; 301 idm_task_t *itp; 302 303 itp = icmdp->cmd_itp; 304 ASSERT(itp != NULL); 305 ASSERT((opcode == ISCSI_OP_SCSI_DATA_RSP) || 306 (opcode == ISCSI_OP_SCSI_RSP)); 307 308 bp = icmdp->cmd_un.scsi.bp; 309 ibp = icmdp->cmd_un.scsi.ibp_ibuf; 310 obp = icmdp->cmd_un.scsi.ibp_obuf; 311 ISCSI_IO_LOG(CE_NOTE, "DEBUG: task_cleanup: itp: %p opcode: %d " 312 "icmdp: %p bp: %p ibp: %p", (void *)itp, opcode, 313 (void *)icmdp, (void *)bp, (void *)ibp); 314 if (bp && bp->b_bcount) { 315 if (ibp != NULL && bp->b_flags & B_READ) { 316 idm_buf_unbind_in(itp, ibp); 317 idm_buf_free(ibp); 318 icmdp->cmd_un.scsi.ibp_ibuf = NULL; 319 } else if (obp != NULL && !(bp->b_flags & B_READ)) { 320 idm_buf_unbind_out(itp, obp); 321 idm_buf_free(obp); 322 icmdp->cmd_un.scsi.ibp_obuf = NULL; 323 } 324 } 325 326 idm_task_done(itp); 327 } 328 329 idm_status_t 330 iscsi_rx_chk(iscsi_conn_t *icp, iscsi_sess_t *isp, 331 iscsi_scsi_rsp_hdr_t *irhp, iscsi_cmd_t **icmdp) 332 { 333 iscsi_status_t rval; 334 335 mutex_enter(&isp->sess_cmdsn_mutex); 336 337 if (icp->conn_expstatsn == ntohl(irhp->statsn)) { 338 icp->conn_expstatsn++; 339 } else { 340 cmn_err(CE_WARN, "iscsi connection(%u/%x) protocol error - " 341 "received status out of order itt:0x%x statsn:0x%x " 342 "expstatsn:0x%x", icp->conn_oid, irhp->opcode, 343 irhp->itt, ntohl(irhp->statsn), icp->conn_expstatsn); 344 mutex_exit(&isp->sess_cmdsn_mutex); 345 return (IDM_STATUS_PROTOCOL_ERROR); 346 } 347 348 /* get icmdp so we can cleanup on error */ 349 if ((irhp->opcode == ISCSI_OP_SCSI_DATA_RSP) || 350 (irhp->opcode == ISCSI_OP_SCSI_RSP)) { 351 rval = iscsi_rx_process_scsi_itt_to_icmdp(isp, icp->conn_ic, 352 irhp, icmdp); 353 } else { 354 rval = iscsi_rx_process_itt_to_icmdp(isp, 355 (iscsi_hdr_t *)irhp, icmdp); 356 } 357 358 if (!ISCSI_SUCCESS(rval)) { 359 mutex_exit(&isp->sess_cmdsn_mutex); 360 return (IDM_STATUS_PROTOCOL_ERROR); 361 } 362 363 /* update expcmdsn and maxcmdsn */ 364 iscsi_update_flow_control(isp, ntohl(irhp->maxcmdsn), 365 ntohl(irhp->expcmdsn)); 366 mutex_exit(&isp->sess_cmdsn_mutex); 367 return (IDM_STATUS_SUCCESS); 368 } 369 370 static void 371 iscsi_cmd_rsp_chk(iscsi_cmd_t *icmdp, iscsi_scsi_rsp_hdr_t *issrhp) 372 { 373 struct scsi_pkt *pkt; 374 size_t data_transferred; 375 376 pkt = icmdp->cmd_un.scsi.pkt; 377 pkt->pkt_resid = 0; 378 data_transferred = icmdp->cmd_un.scsi.data_transferred; 379 /* Check the residual count */ 380 if ((icmdp->cmd_un.scsi.bp) && 381 (data_transferred != icmdp->cmd_un.scsi.bp->b_bcount)) { 382 /* 383 * We didn't xfer the expected amount of data - 384 * the residual_count in the header is only 385 * valid if the underflow flag is set. 386 */ 387 if (issrhp->flags & ISCSI_FLAG_CMD_UNDERFLOW) { 388 pkt->pkt_resid = ntohl(issrhp->residual_count); 389 } else { 390 if (icmdp->cmd_un.scsi.bp->b_bcount > 391 data_transferred) { 392 /* 393 * Some data fell on the floor 394 * somehow - probably a CRC error 395 */ 396 pkt->pkt_resid = 397 icmdp->cmd_un.scsi.bp->b_bcount - 398 data_transferred; 399 } 400 } 401 ISCSI_IO_LOG(CE_NOTE, 402 "DEBUG: iscsi_rx_cmd_rsp_chk: itt: %u" 403 "data_trans != b_count data_transferred: %lu " 404 "b_count: %lu cmd_status: %d flags: %d resid: %lu", 405 issrhp->itt, data_transferred, 406 icmdp->cmd_un.scsi.bp->b_bcount, 407 issrhp->cmd_status & STATUS_MASK, 408 issrhp->flags, pkt->pkt_resid); 409 } 410 /* set flags that tell SCSA that the command is complete */ 411 if (icmdp->cmd_crc_error_seen == B_FALSE) { 412 /* Set successful completion */ 413 pkt->pkt_reason = CMD_CMPLT; 414 if (icmdp->cmd_un.scsi.bp) { 415 pkt->pkt_state |= (STATE_XFERRED_DATA | 416 STATE_GOT_STATUS); 417 } else { 418 pkt->pkt_state |= STATE_GOT_STATUS; 419 } 420 } else { 421 /* 422 * Some of the data was found to have an incorrect 423 * error at the protocol error. 424 */ 425 pkt->pkt_reason = CMD_PER_FAIL; 426 pkt->pkt_statistics |= STAT_PERR; 427 if (icmdp->cmd_un.scsi.bp) { 428 pkt->pkt_resid = 429 icmdp->cmd_un.scsi.bp->b_bcount; 430 } else { 431 pkt->pkt_resid = 0; 432 } 433 } 434 } 435 436 static boolean_t 437 iscsi_cmd_rsp_cmd_status(iscsi_cmd_t *icmdp, iscsi_scsi_rsp_hdr_t *issrhp, 438 uint8_t *data) 439 { 440 int32_t dlength; 441 struct scsi_arq_status *arqstat; 442 size_t senselen; 443 int32_t statuslen; 444 int32_t sensebuf_len; 445 struct scsi_pkt *pkt; 446 boolean_t affect = B_FALSE; 447 int32_t senselen_to_copy; 448 449 pkt = icmdp->cmd_un.scsi.pkt; 450 dlength = n2h24(issrhp->dlength); 451 452 /* 453 * Process iSCSI Cmd Response Status 454 * RFC 3720 Sectionn 10.4.2. 455 */ 456 switch (issrhp->cmd_status & STATUS_MASK) { 457 case STATUS_GOOD: 458 /* pass SCSI status up stack */ 459 if (pkt->pkt_scbp) { 460 pkt->pkt_scbp[0] = issrhp->cmd_status; 461 } 462 break; 463 case STATUS_CHECK: 464 /* 465 * Verify we received a sense buffer and 466 * that there is the correct amount of 467 * request sense space to copy it to. 468 */ 469 if ((dlength > 1) && 470 (pkt->pkt_scbp != NULL) && 471 (icmdp->cmd_un.scsi.statuslen >= 472 sizeof (struct scsi_arq_status))) { 473 /* 474 * If a bad command status is received we 475 * need to reset the pkt_resid to zero. 476 * The target driver compares its value 477 * before checking other error flags. 478 * (ex. check conditions) 479 */ 480 pkt->pkt_resid = 0; 481 482 /* get sense length from first 2 bytes */ 483 senselen = ((data[0] << 8) | data[1]) & 484 (size_t)0xFFFF; 485 ISCSI_IO_LOG(CE_NOTE, 486 "DEBUG: iscsi_rx_cmd_rsp_cmd_status status_check: " 487 "dlen: %d scbp: %p statuslen: %d arq: %d senselen:" 488 " %lu", dlength, (void *)pkt->pkt_scbp, 489 icmdp->cmd_un.scsi.statuslen, 490 (int)sizeof (struct scsi_arq_status), 491 senselen); 492 493 /* Sanity-check on the sense length */ 494 if ((senselen + 2) > dlength) { 495 senselen = dlength - 2; 496 } 497 498 /* 499 * If there was a Data Digest error then 500 * the sense data cannot be trusted. 501 */ 502 if (icmdp->cmd_crc_error_seen) { 503 senselen = 0; 504 } 505 506 /* automatic request sense */ 507 arqstat = 508 (struct scsi_arq_status *)pkt->pkt_scbp; 509 510 /* pass SCSI status up stack */ 511 *((uchar_t *)&arqstat->sts_status) = 512 issrhp->cmd_status; 513 514 /* 515 * Set the status for the automatic 516 * request sense command 517 */ 518 arqstat->sts_rqpkt_state = (STATE_GOT_BUS | 519 STATE_GOT_TARGET | STATE_SENT_CMD | 520 STATE_XFERRED_DATA | STATE_GOT_STATUS | 521 STATE_ARQ_DONE); 522 523 *((uchar_t *)&arqstat->sts_rqpkt_status) = 524 STATUS_GOOD; 525 526 arqstat->sts_rqpkt_reason = CMD_CMPLT; 527 statuslen = icmdp->cmd_un.scsi.statuslen; 528 529 if (senselen == 0) { 530 /* auto request sense failed */ 531 arqstat->sts_rqpkt_status.sts_chk = 1; 532 arqstat->sts_rqpkt_resid = statuslen; 533 } else if (senselen < statuslen) { 534 /* auto request sense short */ 535 arqstat->sts_rqpkt_resid = statuslen - senselen; 536 } else { 537 /* auto request sense complete */ 538 arqstat->sts_rqpkt_resid = 0; 539 } 540 arqstat->sts_rqpkt_statistics = 0; 541 pkt->pkt_state |= STATE_ARQ_DONE; 542 543 if (icmdp->cmd_misc_flags & ISCSI_CMD_MISCFLAG_XARQ) { 544 pkt->pkt_state |= STATE_XARQ_DONE; 545 } 546 547 /* 548 * Calculate size of space reserved for sense data in 549 * pkt->pkt_scbp. 550 */ 551 sensebuf_len = statuslen - ISCSI_ARQ_STATUS_NOSENSE_LEN; 552 553 /* copy auto request sense */ 554 senselen_to_copy = min(senselen, sensebuf_len); 555 if (senselen_to_copy > 0) { 556 bcopy(&data[2], (uchar_t *)&arqstat-> 557 sts_sensedata, senselen_to_copy); 558 559 affect = iscsi_decode_sense( 560 (uint8_t *)&arqstat->sts_sensedata); 561 } 562 arqstat->sts_rqpkt_resid = sensebuf_len - 563 senselen_to_copy; 564 ISCSI_IO_LOG(CE_NOTE, "DEBUG: iscsi_cmd_rsp_cmd_status:" 565 " sts_rqpkt_resid: %d pkt_scblen: %d senselen: %lu" 566 " sensebuf_len: %d senselen_to_copy: %d affect: %d", 567 arqstat->sts_rqpkt_resid, pkt->pkt_scblen, senselen, 568 sensebuf_len, senselen_to_copy, affect); 569 break; 570 } 571 /* FALLTHRU */ 572 case STATUS_BUSY: 573 case STATUS_RESERVATION_CONFLICT: 574 case STATUS_QFULL: 575 case STATUS_ACA_ACTIVE: 576 default: 577 /* 578 * If a bad command status is received we need to 579 * reset the pkt_resid to zero. The target driver 580 * compares its value before checking other error 581 * flags. (ex. check conditions) 582 */ 583 ISCSI_IO_LOG(CE_NOTE, 584 "DEBUG: iscsi_rx_cmd_rsp_cmd_status: status: " 585 "%d cmd_status: %d dlen: %u scbp: %p statuslen: %d " 586 "arg_len: %d", issrhp->cmd_status & STATUS_MASK, 587 issrhp->cmd_status, dlength, (void *)pkt->pkt_scbp, 588 icmdp->cmd_un.scsi.statuslen, 589 (int)sizeof (struct scsi_arq_status)); 590 pkt->pkt_resid = 0; 591 /* pass SCSI status up stack */ 592 if (pkt->pkt_scbp) { 593 pkt->pkt_scbp[0] = issrhp->cmd_status; 594 } 595 } 596 597 return (affect); 598 } 599 600 /* 601 * iscsi_rx_process_login_pdup - Process login response PDU. This function 602 * copies the data into the connection context so that the login code can 603 * interpret it. 604 */ 605 606 idm_status_t 607 iscsi_rx_process_login_pdu(idm_conn_t *ic, idm_pdu_t *pdu) 608 { 609 iscsi_conn_t *icp; 610 611 icp = ic->ic_handle; 612 613 /* 614 * Copy header and data into connection structure so iscsi_login() 615 * can process it. 616 */ 617 mutex_enter(&icp->conn_login_mutex); 618 /* 619 * If conn_login_state != LOGIN_TX then we are not ready to handle 620 * this login response and we should just drop it. 621 */ 622 if (icp->conn_login_state == LOGIN_TX) { 623 icp->conn_login_datalen = pdu->isp_datalen; 624 bcopy(pdu->isp_hdr, &icp->conn_login_resp_hdr, 625 sizeof (iscsi_hdr_t)); 626 /* 627 * Login code is sloppy with it's NULL handling so make sure 628 * we don't leave any stale data in there. 629 */ 630 bzero(icp->conn_login_data, icp->conn_login_max_data_length); 631 bcopy(pdu->isp_data, icp->conn_login_data, 632 MIN(pdu->isp_datalen, icp->conn_login_max_data_length)); 633 iscsi_login_update_state_locked(icp, LOGIN_RX); 634 } 635 mutex_exit(&icp->conn_login_mutex); 636 637 return (IDM_STATUS_SUCCESS); 638 } 639 640 /* 641 * iscsi_rx_process_cmd_rsp - Process received scsi command response. This 642 * will contain sense data if the command was not successful. This data needs 643 * to be copied into the scsi_pkt. Otherwise we just complete the IO. 644 */ 645 static idm_status_t 646 iscsi_rx_process_cmd_rsp(idm_conn_t *ic, idm_pdu_t *pdu) 647 { 648 iscsi_conn_t *icp = ic->ic_handle; 649 iscsi_sess_t *isp = icp->conn_sess; 650 iscsi_scsi_rsp_hdr_t *issrhp = (iscsi_scsi_rsp_hdr_t *)pdu->isp_hdr; 651 uint8_t *data = pdu->isp_data; 652 iscsi_cmd_t *icmdp = NULL; 653 struct scsi_pkt *pkt = NULL; 654 idm_status_t rval; 655 struct buf *bp; 656 boolean_t flush = B_FALSE; 657 uint32_t cmd_sn = 0; 658 uint16_t lun_num = 0; 659 660 /* make sure we get status in order */ 661 mutex_enter(&icp->conn_queue_active.mutex); 662 663 if ((rval = iscsi_rx_chk(icp, isp, issrhp, 664 &icmdp)) != IDM_STATUS_SUCCESS) { 665 if (icmdp != NULL) { 666 iscsi_task_cleanup(issrhp->opcode, icmdp); 667 } 668 mutex_exit(&icp->conn_queue_active.mutex); 669 return (rval); 670 } 671 672 /* 673 * If we are in "idm aborting" state then we shouldn't continue 674 * to process this command. By definition this command is no longer 675 * on the active queue so we shouldn't try to remove it either. 676 */ 677 mutex_enter(&icmdp->cmd_mutex); 678 if (icmdp->cmd_state == ISCSI_CMD_STATE_IDM_ABORTING) { 679 mutex_exit(&icmdp->cmd_mutex); 680 mutex_exit(&icp->conn_queue_active.mutex); 681 return (IDM_STATUS_SUCCESS); 682 } 683 mutex_exit(&icmdp->cmd_mutex); 684 685 /* Get the IDM buffer and bytes transferred */ 686 bp = icmdp->cmd_un.scsi.bp; 687 if (ic->ic_conn_flags & IDM_CONN_USE_SCOREBOARD) { 688 /* Transport tracks bytes transferred so use those counts */ 689 if (bp && (bp->b_flags & B_READ)) { 690 icmdp->cmd_un.scsi.data_transferred += 691 icmdp->cmd_itp->idt_rx_bytes; 692 } else { 693 icmdp->cmd_un.scsi.data_transferred += 694 icmdp->cmd_itp->idt_tx_bytes; 695 } 696 } else { 697 /* 698 * Some transports cannot track the bytes transferred on 699 * the initiator side (like iSER) so we have to use the 700 * status info. If the response field indicates that 701 * the command actually completed then we will assume 702 * the data_transferred value represents the entire buffer 703 * unless the resid field says otherwise. This is a bit 704 * unintuitive but it's really impossible to know what 705 * has been transferred without detailed consideration 706 * of the SCSI status and sense key and that is outside 707 * the scope of the transport. Instead the target/class driver 708 * can consider these values along with the resid and figure 709 * it out. The data_transferred concept is just belt and 710 * suspenders anyway -- RFC 3720 actually explicitly rejects 711 * scoreboarding ("Initiators SHOULD NOT keep track of the 712 * data transferred to or from the target (scoreboarding)") 713 * perhaps for this very reason. 714 */ 715 if (issrhp->response != 0) { 716 icmdp->cmd_un.scsi.data_transferred = 0; 717 } else { 718 icmdp->cmd_un.scsi.data_transferred = 719 (bp == NULL) ? 0 : bp->b_bcount; 720 if (issrhp->flags & ISCSI_FLAG_CMD_UNDERFLOW) { 721 icmdp->cmd_un.scsi.data_transferred -= 722 ntohl(issrhp->residual_count); 723 } 724 } 725 } 726 727 ISCSI_CHECK_SCSI_READ(icmdp, issrhp, 728 icmdp->cmd_un.scsi.data_transferred, 729 BP_CHECK_THOROUGH); 730 731 ISCSI_IO_LOG(CE_NOTE, "DEBUG: rx_process_cmd_rsp: ic: %p pdu: %p itt:" 732 " %x expcmdsn: %x sess_cmd: %x sess_expcmdsn: %x data_transfered:" 733 " %lu ibp: %p obp: %p", (void *)ic, (void *)pdu, issrhp->itt, 734 issrhp->expcmdsn, isp->sess_cmdsn, isp->sess_expcmdsn, 735 icmdp->cmd_un.scsi.data_transferred, 736 (void *)icmdp->cmd_un.scsi.ibp_ibuf, 737 (void *)icmdp->cmd_un.scsi.ibp_obuf); 738 739 iscsi_task_cleanup(issrhp->opcode, icmdp); 740 741 if (issrhp->response) { 742 /* The target failed the command. */ 743 ISCSI_IO_LOG(CE_NOTE, "DEBUG: rx_process_cmd_rsp: ic: %p pdu:" 744 " %p response: %d bcount: %lu", (void *)ic, (void *)pdu, 745 issrhp->response, icmdp->cmd_un.scsi.bp->b_bcount); 746 pkt = icmdp->cmd_un.scsi.pkt; 747 pkt->pkt_reason = CMD_TRAN_ERR; 748 if (icmdp->cmd_un.scsi.bp) { 749 pkt->pkt_resid = icmdp->cmd_un.scsi.bp->b_bcount; 750 } else { 751 pkt->pkt_resid = 0; 752 } 753 } else { 754 /* success */ 755 iscsi_cmd_rsp_chk(icmdp, issrhp); 756 flush = iscsi_cmd_rsp_cmd_status(icmdp, issrhp, data); 757 758 ASSERT(icmdp->cmd_lun == NULL || icmdp->cmd_lun->lun_num == 759 (icmdp->cmd_un.scsi.lun & ISCSI_LUN_MASK)); 760 761 if (flush == B_TRUE) { 762 cmd_sn = icmdp->cmd_sn; 763 lun_num = icmdp->cmd_un.scsi.lun & ISCSI_LUN_MASK; 764 } 765 } 766 767 iscsi_cmd_state_machine(icmdp, ISCSI_CMD_EVENT_E3, isp); 768 if (flush == B_TRUE) { 769 iscsi_flush_cmd_after_reset(cmd_sn, lun_num, icp); 770 } 771 mutex_exit(&icp->conn_queue_active.mutex); 772 return (IDM_STATUS_SUCCESS); 773 } 774 775 static void 776 iscsi_data_rsp_pkt(iscsi_cmd_t *icmdp, iscsi_data_rsp_hdr_t *idrhp) 777 { 778 struct buf *bp = NULL; 779 size_t data_transferred; 780 struct scsi_pkt *pkt; 781 782 bp = icmdp->cmd_un.scsi.bp; 783 pkt = icmdp->cmd_un.scsi.pkt; 784 data_transferred = icmdp->cmd_un.scsi.data_transferred; 785 /* 786 * The command* must be completed now, since we won't get a command 787 * response PDU. The cmd_status and residual_count are 788 * not meaningful unless status_present is set. 789 */ 790 pkt->pkt_resid = 0; 791 /* Check the residual count */ 792 if (bp && (data_transferred != bp->b_bcount)) { 793 /* 794 * We didn't xfer the expected amount of data - 795 * the residual_count in the header is only valid 796 * if the underflow flag is set. 797 */ 798 if (idrhp->flags & ISCSI_FLAG_DATA_UNDERFLOW) { 799 pkt->pkt_resid = ntohl(idrhp->residual_count); 800 ISCSI_IO_LOG(CE_NOTE, "DEBUG: iscsi_data_rsp_pkt: " 801 "underflow: itt: %d " 802 "transferred: %lu count: %lu", idrhp->itt, 803 data_transferred, bp->b_bcount); 804 } else { 805 if (bp->b_bcount > data_transferred) { 806 /* Some data fell on the floor somehw */ 807 ISCSI_IO_LOG(CE_NOTE, "DEBUG: " 808 "iscsi_data_rsp_pkt: data fell: itt: %d " 809 "transferred: %lu count: %lu", idrhp->itt, 810 data_transferred, bp->b_bcount); 811 pkt->pkt_resid = 812 bp->b_bcount - data_transferred; 813 } 814 } 815 } 816 817 pkt->pkt_reason = CMD_CMPLT; 818 pkt->pkt_state |= (STATE_XFERRED_DATA | STATE_GOT_STATUS); 819 820 if (((idrhp->cmd_status & STATUS_MASK) != STATUS_GOOD) && 821 (icmdp->cmd_un.scsi.statuslen >= 822 sizeof (struct scsi_arq_status)) && pkt->pkt_scbp) { 823 824 /* 825 * Not supposed to get exception status here! 826 * We have no request sense data so just do the 827 * best we can 828 */ 829 struct scsi_arq_status *arqstat = 830 (struct scsi_arq_status *)pkt->pkt_scbp; 831 832 833 bzero(arqstat, sizeof (struct scsi_arq_status)); 834 835 *((uchar_t *)&arqstat->sts_status) = 836 idrhp->cmd_status; 837 838 /* sense residual is set to whole size of sense buffer */ 839 arqstat->sts_rqpkt_resid = icmdp->cmd_un.scsi.statuslen - 840 ISCSI_ARQ_STATUS_NOSENSE_LEN; 841 ISCSI_IO_LOG(CE_NOTE, "DEBUG: iscsi_data_rsp_pkt: " 842 "exception status: itt: %d resid: %d", 843 idrhp->itt, arqstat->sts_rqpkt_resid); 844 845 } else if (pkt->pkt_scbp) { 846 /* just pass along the status we got */ 847 pkt->pkt_scbp[0] = idrhp->cmd_status; 848 } 849 } 850 851 /* 852 * iscsi_rx_process_data_rsp - 853 * This currently processes the final data sequence denoted by the data response 854 * PDU Status bit being set. We will not receive the SCSI response. 855 * This bit denotes that the PDU is the successful completion of the 856 * command. 857 */ 858 static idm_status_t 859 iscsi_rx_process_data_rsp(idm_conn_t *ic, idm_pdu_t *pdu) 860 { 861 iscsi_sess_t *isp = NULL; 862 iscsi_data_rsp_hdr_t *idrhp = (iscsi_data_rsp_hdr_t *)pdu->isp_hdr; 863 iscsi_cmd_t *icmdp = NULL; 864 struct buf *bp = NULL; 865 iscsi_conn_t *icp = ic->ic_handle; 866 idm_buf_t *ibp; 867 idm_status_t rval; 868 869 870 /* should only call this when the data rsp contains final rsp */ 871 ASSERT(idrhp->flags & ISCSI_FLAG_DATA_STATUS); 872 isp = icp->conn_sess; 873 874 mutex_enter(&icp->conn_queue_active.mutex); 875 if ((rval = iscsi_rx_chk(icp, isp, (iscsi_scsi_rsp_hdr_t *)idrhp, 876 &icmdp)) != IDM_STATUS_SUCCESS) { 877 if (icmdp != NULL) { 878 iscsi_task_cleanup(idrhp->opcode, icmdp); 879 } 880 mutex_exit(&icp->conn_queue_active.mutex); 881 return (rval); 882 } 883 884 /* 885 * If we are in "idm aborting" state then we shouldn't continue 886 * to process this command. By definition this command is no longer 887 * on the active queue so we shouldn't try to remove it either. 888 */ 889 mutex_enter(&icmdp->cmd_mutex); 890 if (icmdp->cmd_state == ISCSI_CMD_STATE_IDM_ABORTING) { 891 mutex_exit(&icmdp->cmd_mutex); 892 mutex_exit(&icp->conn_queue_active.mutex); 893 return (IDM_STATUS_SUCCESS); 894 } 895 mutex_exit(&icmdp->cmd_mutex); 896 897 /* 898 * Holding the pending/active queue locks across the 899 * iscsi_rx_data call later in this function may cause 900 * deadlock during fault injections. Instead remove 901 * the cmd from the active queue and release the locks. 902 * Then before returning or completing the command 903 * return the cmd to the active queue and reacquire 904 * the locks. 905 */ 906 iscsi_dequeue_active_cmd(icp, icmdp); 907 908 mutex_exit(&icp->conn_queue_active.mutex); 909 910 /* shorthand some values */ 911 bp = icmdp->cmd_un.scsi.bp; 912 913 /* 914 * some poorly behaved targets have been observed 915 * sending data-in pdu's during a write operation 916 */ 917 if (bp != NULL) { 918 if (!(bp->b_flags & B_READ)) { 919 cmn_err(CE_WARN, 920 "iscsi connection(%u) protocol error - " 921 "received data response during write operation " 922 "itt:0x%x", 923 icp->conn_oid, idrhp->itt); 924 mutex_enter(&icp->conn_queue_active.mutex); 925 iscsi_enqueue_active_cmd(icp, icmdp); 926 mutex_exit(&icp->conn_queue_active.mutex); 927 return (IDM_STATUS_PROTOCOL_ERROR); 928 } 929 } 930 931 ibp = icmdp->cmd_un.scsi.ibp_ibuf; 932 if (ibp == NULL) { 933 /* 934 * After the check of bp above we *should* have a corresponding 935 * idm_buf_t (ibp). It's possible that the original call 936 * to idm_buf_alloc failed due to a pending connection state 937 * transition in which case this value can be NULL. It's 938 * highly unlikely that the connection would be shutting down 939 * *and* we manage to process a data response and get to this 940 * point in the code but just in case we should check for it. 941 * This isn't really a protocol error -- we are almost certainly 942 * closing the connection anyway so just return a generic error. 943 */ 944 mutex_enter(&icp->conn_queue_active.mutex); 945 iscsi_enqueue_active_cmd(icp, icmdp); 946 mutex_exit(&icp->conn_queue_active.mutex); 947 return (IDM_STATUS_FAIL); 948 } 949 950 if (ic->ic_conn_flags & IDM_CONN_USE_SCOREBOARD) { 951 icmdp->cmd_un.scsi.data_transferred = 952 icmdp->cmd_itp->idt_rx_bytes; 953 } else { 954 icmdp->cmd_un.scsi.data_transferred = bp->b_bcount; 955 if (idrhp->flags & ISCSI_FLAG_CMD_UNDERFLOW) { 956 icmdp->cmd_un.scsi.data_transferred -= 957 ntohl(idrhp->residual_count); 958 } 959 } 960 961 ISCSI_IO_LOG(CE_NOTE, "DEBUG: rx_process_data_rsp: icp: %p pdu: %p " 962 "itt: %d ibp: %p icmdp: %p xfer_len: %lu transferred: %lu dlen: %u", 963 (void *)icp, (void *)pdu, idrhp->itt, (void *)bp, (void *)icmdp, 964 (ibp == NULL) ? 0 : ibp->idb_xfer_len, 965 icmdp->cmd_un.scsi.data_transferred, 966 n2h24(idrhp->dlength)); 967 968 iscsi_task_cleanup(idrhp->opcode, icmdp); 969 970 iscsi_data_rsp_pkt(icmdp, idrhp); 971 972 mutex_enter(&icp->conn_queue_active.mutex); 973 iscsi_enqueue_active_cmd(icp, icmdp); 974 iscsi_cmd_state_machine(icmdp, ISCSI_CMD_EVENT_E3, isp); 975 mutex_exit(&icp->conn_queue_active.mutex); 976 977 return (IDM_STATUS_SUCCESS); 978 } 979 980 /* 981 * iscsi_rx_process_nop - Process a received nop. If nop is in response 982 * to a ping we sent update stats. If initiated by the target we need 983 * to response back to the target with a nop. Schedule the response. 984 */ 985 /* ARGSUSED */ 986 static idm_status_t 987 iscsi_rx_process_nop(idm_conn_t *ic, idm_pdu_t *pdu) 988 { 989 iscsi_sess_t *isp = NULL; 990 iscsi_nop_in_hdr_t *inihp = (iscsi_nop_in_hdr_t *)pdu->isp_hdr; 991 iscsi_cmd_t *icmdp = NULL; 992 iscsi_conn_t *icp = ic->ic_handle; 993 994 if (icp->conn_expstatsn != ntohl(inihp->statsn)) { 995 cmn_err(CE_WARN, "iscsi connection(%u/%x) protocol error - " 996 "received status out of order itt:0x%x statsn:0x%x " 997 "expstatsn:0x%x", icp->conn_oid, inihp->opcode, inihp->itt, 998 ntohl(inihp->statsn), icp->conn_expstatsn); 999 return (IDM_STATUS_PROTOCOL_ERROR); 1000 } 1001 isp = icp->conn_sess; 1002 ASSERT(isp != NULL); 1003 mutex_enter(&isp->sess_queue_pending.mutex); 1004 mutex_enter(&icp->conn_queue_active.mutex); 1005 mutex_enter(&isp->sess_cmdsn_mutex); 1006 if (inihp->itt != ISCSI_RSVD_TASK_TAG) { 1007 if (!ISCSI_SUCCESS(iscsi_rx_process_itt_to_icmdp( 1008 isp, (iscsi_hdr_t *)inihp, &icmdp))) { 1009 cmn_err(CE_WARN, "iscsi connection(%u) protocol error " 1010 "- can not find cmd for itt:0x%x", 1011 icp->conn_oid, inihp->itt); 1012 mutex_exit(&isp->sess_cmdsn_mutex); 1013 mutex_exit(&icp->conn_queue_active.mutex); 1014 mutex_exit(&isp->sess_queue_pending.mutex); 1015 return (IDM_STATUS_PROTOCOL_ERROR); 1016 } 1017 } 1018 1019 /* update expcmdsn and maxcmdsn */ 1020 iscsi_update_flow_control(isp, ntohl(inihp->maxcmdsn), 1021 ntohl(inihp->expcmdsn)); 1022 mutex_exit(&isp->sess_cmdsn_mutex); 1023 1024 if ((inihp->itt != ISCSI_RSVD_TASK_TAG) && 1025 (inihp->ttt == ISCSI_RSVD_TASK_TAG)) { 1026 /* This is the only type of nop that incs. the expstatsn */ 1027 icp->conn_expstatsn++; 1028 1029 /* 1030 * This is a targets response to our nop 1031 */ 1032 iscsi_cmd_state_machine(icmdp, ISCSI_CMD_EVENT_E3, isp); 1033 } else if (inihp->ttt != ISCSI_RSVD_TASK_TAG) { 1034 /* 1035 * Target requested a nop. Send one. 1036 */ 1037 iscsi_handle_nop(icp, ISCSI_RSVD_TASK_TAG, inihp->ttt); 1038 } else { 1039 /* 1040 * This is a target-initiated ping that doesn't expect 1041 * a response; nothing to do except update our flow control 1042 * (which we do in all cases above). 1043 */ 1044 /* EMPTY */ 1045 } 1046 mutex_exit(&icp->conn_queue_active.mutex); 1047 mutex_exit(&isp->sess_queue_pending.mutex); 1048 1049 return (IDM_STATUS_SUCCESS); 1050 } 1051 1052 1053 /* 1054 * iscsi_rx_process_reject_rsp - The server rejected a PDU 1055 */ 1056 static idm_status_t 1057 iscsi_rx_process_reject_rsp(idm_conn_t *ic, idm_pdu_t *pdu) 1058 { 1059 iscsi_reject_rsp_hdr_t *irrhp = (iscsi_reject_rsp_hdr_t *)pdu->isp_hdr; 1060 iscsi_sess_t *isp = NULL; 1061 uint32_t dlength = 0; 1062 iscsi_hdr_t *old_ihp = NULL; 1063 iscsi_conn_t *icp = ic->ic_handle; 1064 uint8_t *data = pdu->isp_data; 1065 idm_status_t status = IDM_STATUS_SUCCESS; 1066 int i = 0; 1067 1068 ASSERT(data != NULL); 1069 isp = icp->conn_sess; 1070 ASSERT(isp != NULL); 1071 1072 /* 1073 * In RFC3720 section 10.17, this 4 bytes should be all 0xff. 1074 */ 1075 for (i = 0; i < 4; i++) { 1076 if (irrhp->must_be_ff[i] != 0xff) { 1077 return (IDM_STATUS_PROTOCOL_ERROR); 1078 } 1079 } 1080 mutex_enter(&isp->sess_cmdsn_mutex); 1081 1082 if (icp->conn_expstatsn == ntohl(irrhp->statsn)) { 1083 icp->conn_expstatsn++; 1084 } else { 1085 cmn_err(CE_WARN, "iscsi connection(%u/%x) protocol error - " 1086 "received status out of order statsn:0x%x " 1087 "expstatsn:0x%x", icp->conn_oid, irrhp->opcode, 1088 ntohl(irrhp->statsn), icp->conn_expstatsn); 1089 mutex_exit(&isp->sess_cmdsn_mutex); 1090 return (IDM_STATUS_PROTOCOL_ERROR); 1091 } 1092 /* update expcmdsn and maxcmdsn */ 1093 iscsi_update_flow_control(isp, ntohl(irrhp->maxcmdsn), 1094 ntohl(irrhp->expcmdsn)); 1095 1096 mutex_exit(&isp->sess_cmdsn_mutex); 1097 1098 /* If we don't have the rejected header we can't do anything */ 1099 dlength = n2h24(irrhp->dlength); 1100 if (dlength < sizeof (iscsi_hdr_t)) { 1101 return (IDM_STATUS_PROTOCOL_ERROR); 1102 } 1103 1104 /* map old ihp */ 1105 old_ihp = (iscsi_hdr_t *)data; 1106 1107 switch (irrhp->reason) { 1108 /* 1109 * ISCSI_REJECT_IMM_CMD_REJECT - Immediate Command Reject 1110 * too many immediate commands (original cmd can be resent) 1111 */ 1112 case ISCSI_REJECT_IMM_CMD_REJECT: 1113 /* 1114 * We have exceeded the server's capacity for outstanding 1115 * immediate commands. This must be a task management 1116 * command so try to find it in the abortingqueue and 1117 * complete it. 1118 */ 1119 if (!(old_ihp->opcode & ISCSI_OP_IMMEDIATE)) { 1120 /* Rejecting IMM but old old_hdr wasn't IMM */ 1121 return (IDM_STATUS_PROTOCOL_ERROR); 1122 } 1123 1124 /* 1125 * We only send NOP and TASK_MGT as IMM. All other 1126 * cases should be considered as a protocol error. 1127 */ 1128 switch (old_ihp->opcode & ISCSI_OPCODE_MASK) { 1129 case ISCSI_OP_NOOP_OUT: 1130 /* 1131 * A ping was rejected - treat this like 1132 * ping response. The down side is we 1133 * didn't get an updated MaxCmdSn. 1134 */ 1135 break; 1136 case ISCSI_OP_SCSI_TASK_MGT_MSG: 1137 status = 1138 iscsi_rx_process_rejected_tsk_mgt(ic, old_ihp); 1139 break; 1140 default: 1141 cmn_err(CE_WARN, "iscsi connection(%u) protocol error " 1142 "- received a reject for a command(0x%02x) not " 1143 "sent as an immediate", icp->conn_oid, 1144 old_ihp->opcode); 1145 status = IDM_STATUS_PROTOCOL_ERROR; 1146 break; 1147 } 1148 break; 1149 1150 /* 1151 * For the rest of the reject cases just use the general 1152 * hammer of dis/reconnecting. This will resolve all 1153 * noted issues although could be more graceful. 1154 */ 1155 case ISCSI_REJECT_DATA_DIGEST_ERROR: 1156 case ISCSI_REJECT_CMD_BEFORE_LOGIN: 1157 case ISCSI_REJECT_SNACK_REJECT: 1158 case ISCSI_REJECT_PROTOCOL_ERROR: 1159 case ISCSI_REJECT_CMD_NOT_SUPPORTED: 1160 case ISCSI_REJECT_TASK_IN_PROGRESS: 1161 case ISCSI_REJECT_INVALID_DATA_ACK: 1162 case ISCSI_REJECT_INVALID_PDU_FIELD: 1163 case ISCSI_REJECT_LONG_OPERATION_REJECT: 1164 case ISCSI_REJECT_NEGOTIATION_RESET: 1165 default: 1166 cmn_err(CE_WARN, "iscsi connection(%u/%x) closing connection - " 1167 "target requested reason:0x%x", 1168 icp->conn_oid, irrhp->opcode, irrhp->reason); 1169 status = IDM_STATUS_PROTOCOL_ERROR; 1170 break; 1171 } 1172 1173 return (status); 1174 } 1175 1176 1177 /* 1178 * iscsi_rx_process_rejected_tsk_mgt - 1179 */ 1180 /* ARGSUSED */ 1181 static idm_status_t 1182 iscsi_rx_process_rejected_tsk_mgt(idm_conn_t *ic, iscsi_hdr_t *old_ihp) 1183 { 1184 iscsi_sess_t *isp = NULL; 1185 iscsi_cmd_t *icmdp = NULL; 1186 iscsi_conn_t *icp = NULL; 1187 1188 isp = icp->conn_sess; 1189 ASSERT(old_ihp != NULL); 1190 ASSERT(isp != NULL); 1191 1192 mutex_enter(&icp->conn_queue_active.mutex); 1193 mutex_enter(&isp->sess_cmdsn_mutex); 1194 if (!ISCSI_SUCCESS(iscsi_rx_process_itt_to_icmdp( 1195 isp, old_ihp, &icmdp))) { 1196 mutex_exit(&isp->sess_cmdsn_mutex); 1197 mutex_exit(&icp->conn_queue_active.mutex); 1198 return (IDM_STATUS_PROTOCOL_ERROR); 1199 } 1200 mutex_exit(&isp->sess_cmdsn_mutex); 1201 1202 switch (icmdp->cmd_type) { 1203 case ISCSI_CMD_TYPE_ABORT: 1204 case ISCSI_CMD_TYPE_RESET: 1205 iscsi_cmd_state_machine(icmdp, ISCSI_CMD_EVENT_E4, 1206 icp->conn_sess); 1207 break; 1208 /* We don't send any other task mgr types */ 1209 default: 1210 ASSERT(B_FALSE); 1211 break; 1212 } 1213 mutex_exit(&icp->conn_queue_active.mutex); 1214 1215 return (IDM_STATUS_SUCCESS); 1216 } 1217 1218 1219 /* 1220 * iscsi_rx_process_task_mgt_rsp - 1221 */ 1222 /* ARGSUSED */ 1223 static idm_status_t 1224 iscsi_rx_process_task_mgt_rsp(idm_conn_t *ic, idm_pdu_t *pdu) 1225 { 1226 iscsi_sess_t *isp = NULL; 1227 iscsi_scsi_task_mgt_rsp_hdr_t *istmrhp = NULL; 1228 iscsi_cmd_t *icmdp = NULL; 1229 iscsi_conn_t *icp = ic->ic_handle; 1230 idm_status_t status = IDM_STATUS_SUCCESS; 1231 1232 isp = icp->conn_sess; 1233 istmrhp = (iscsi_scsi_task_mgt_rsp_hdr_t *)pdu->isp_hdr; 1234 1235 mutex_enter(&icp->conn_queue_active.mutex); 1236 if ((status = iscsi_rx_chk(icp, isp, (iscsi_scsi_rsp_hdr_t *)istmrhp, 1237 &icmdp)) != IDM_STATUS_SUCCESS) { 1238 mutex_exit(&icp->conn_queue_active.mutex); 1239 return (status); 1240 } 1241 1242 switch (icmdp->cmd_type) { 1243 case ISCSI_CMD_TYPE_ABORT: 1244 case ISCSI_CMD_TYPE_RESET: 1245 switch (istmrhp->response) { 1246 case SCSI_TCP_TM_RESP_COMPLETE: 1247 /* success */ 1248 iscsi_cmd_state_machine(icmdp, 1249 ISCSI_CMD_EVENT_E3, isp); 1250 break; 1251 case SCSI_TCP_TM_RESP_NO_TASK: 1252 /* 1253 * If the array no longer knows about 1254 * an ABORT RTT and we no longer have 1255 * a parent SCSI command it was just 1256 * completed, free this ABORT resource. 1257 * Otherwise FALLTHRU this will flag a 1258 * protocol problem. 1259 */ 1260 if ((icmdp->cmd_type == ISCSI_CMD_TYPE_ABORT) && 1261 (icmdp->cmd_un.abort.icmdp == NULL)) { 1262 iscsi_cmd_state_machine(icmdp, 1263 ISCSI_CMD_EVENT_E4, isp); 1264 break; 1265 } 1266 /* FALLTHRU */ 1267 case SCSI_TCP_TM_RESP_REJECTED: 1268 /* 1269 * If the target rejects our reset task, 1270 * we should record the response and complete 1271 * this command with the result. 1272 */ 1273 if (icmdp->cmd_type == ISCSI_CMD_TYPE_RESET) { 1274 icmdp->cmd_un.reset.response = 1275 istmrhp->response; 1276 iscsi_cmd_state_machine(icmdp, 1277 ISCSI_CMD_EVENT_E3, isp); 1278 break; 1279 } 1280 /* FALLTHRU */ 1281 case SCSI_TCP_TM_RESP_NO_LUN: 1282 case SCSI_TCP_TM_RESP_TASK_ALLEGIANT: 1283 case SCSI_TCP_TM_RESP_NO_FAILOVER: 1284 case SCSI_TCP_TM_RESP_IN_PRGRESS: 1285 default: 1286 /* 1287 * Something is out of sync. Flush 1288 * active queues and resync the 1289 * the connection to try and recover 1290 * to a known state. 1291 */ 1292 status = IDM_STATUS_PROTOCOL_ERROR; 1293 } 1294 break; 1295 1296 default: 1297 cmn_err(CE_WARN, "iscsi connection(%u) protocol error - " 1298 "received a task mgt response for a non-task mgt " 1299 "cmd itt:0x%x type:%d", icp->conn_oid, istmrhp->itt, 1300 icmdp->cmd_type); 1301 status = IDM_STATUS_PROTOCOL_ERROR; 1302 break; 1303 } 1304 1305 mutex_exit(&icp->conn_queue_active.mutex); 1306 return (status); 1307 } 1308 1309 1310 /* 1311 * iscsi_rx_process_logout_rsp - 1312 * 1313 */ 1314 /* ARGSUSED */ 1315 idm_status_t 1316 iscsi_rx_process_logout_rsp(idm_conn_t *ic, idm_pdu_t *pdu) 1317 { 1318 iscsi_conn_t *icp = ic->ic_handle; 1319 iscsi_logout_rsp_hdr_t *ilrhp = 1320 (iscsi_logout_rsp_hdr_t *)pdu->isp_hdr; 1321 iscsi_cmd_t *icmdp = NULL; 1322 iscsi_sess_t *isp; 1323 idm_status_t status = IDM_STATUS_SUCCESS; 1324 1325 isp = icp->conn_sess; 1326 1327 if (icp->conn_expstatsn != ntohl(ilrhp->statsn)) { 1328 cmn_err(CE_WARN, "iscsi connection(%u/%x) protocol error - " 1329 "received status out of order itt:0x%x statsn:0x%x " 1330 "expstatsn:0x%x", icp->conn_oid, ilrhp->opcode, ilrhp->itt, 1331 ntohl(ilrhp->statsn), icp->conn_expstatsn); 1332 return (IDM_STATUS_PROTOCOL_ERROR); 1333 } 1334 1335 mutex_enter(&icp->conn_queue_active.mutex); 1336 mutex_enter(&isp->sess_cmdsn_mutex); 1337 if (ilrhp->itt != ISCSI_RSVD_TASK_TAG) { 1338 if (!ISCSI_SUCCESS(iscsi_rx_process_itt_to_icmdp( 1339 isp, (iscsi_hdr_t *)ilrhp, &icmdp))) { 1340 mutex_exit(&isp->sess_cmdsn_mutex); 1341 mutex_exit(&icp->conn_queue_active.mutex); 1342 return (IDM_STATUS_PROTOCOL_ERROR); 1343 } 1344 } 1345 1346 /* update expcmdsn and maxcmdsn */ 1347 iscsi_update_flow_control(isp, ntohl(ilrhp->maxcmdsn), 1348 ntohl(ilrhp->expcmdsn)); 1349 mutex_exit(&isp->sess_cmdsn_mutex); 1350 1351 ISCSI_IO_LOG(CE_NOTE, 1352 "DEBUG: iscsi_rx_process_logout_rsp: response: %d", 1353 ilrhp->response); 1354 switch (ilrhp->response) { 1355 case ISCSI_LOGOUT_CID_NOT_FOUND: 1356 /* 1357 * If the target doesn't know about our connection 1358 * then we can consider our self disconnected. 1359 */ 1360 /* FALLTHRU */ 1361 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 1362 /* 1363 * We don't support ErrorRecovery levels above 0 1364 * currently so consider this success. 1365 */ 1366 /* FALLTHRU */ 1367 case ISCSI_LOGOUT_CLEANUP_FAILED: 1368 /* 1369 * per spec. "cleanup failed for various reasons." 1370 * Although those various reasons are undefined. 1371 * Not sure what to do here. So fake success, 1372 * which will disconnect the connection. 1373 */ 1374 /* FALLTHRU */ 1375 case ISCSI_LOGOUT_SUCCESS: 1376 iscsi_cmd_state_machine(icmdp, ISCSI_CMD_EVENT_E3, isp); 1377 mutex_exit(&icp->conn_queue_active.mutex); 1378 iscsi_drop_conn_cleanup(icp); 1379 break; 1380 default: 1381 mutex_exit(&icp->conn_queue_active.mutex); 1382 status = IDM_STATUS_PROTOCOL_ERROR; 1383 break; 1384 1385 } 1386 return (status); 1387 } 1388 1389 /* 1390 * iscsi_rx_process_async_rsp 1391 * 1392 */ 1393 /* ARGSUSED */ 1394 static idm_status_t 1395 iscsi_rx_process_async_rsp(idm_conn_t *ic, idm_pdu_t *pdu) 1396 { 1397 iscsi_conn_t *icp = ic->ic_handle; 1398 iscsi_sess_t *isp = icp->conn_sess; 1399 idm_status_t rval = IDM_STATUS_SUCCESS; 1400 iscsi_task_t *itp; 1401 iscsi_async_evt_hdr_t *iaehp = 1402 (iscsi_async_evt_hdr_t *)pdu->isp_hdr; 1403 1404 ASSERT(icp != NULL); 1405 ASSERT(pdu != NULL); 1406 ASSERT(isp != NULL); 1407 1408 mutex_enter(&isp->sess_cmdsn_mutex); 1409 if (icp->conn_expstatsn == ntohl(iaehp->statsn)) { 1410 icp->conn_expstatsn++; 1411 } else { 1412 cmn_err(CE_WARN, "iscsi connection(%u) protocol error - " 1413 "received status out of order statsn:0x%x " 1414 "expstatsn:0x%x", icp->conn_oid, 1415 ntohl(iaehp->statsn), icp->conn_expstatsn); 1416 mutex_exit(&isp->sess_cmdsn_mutex); 1417 return (IDM_STATUS_PROTOCOL_ERROR); 1418 } 1419 mutex_exit(&isp->sess_cmdsn_mutex); 1420 1421 switch (iaehp->async_event) { 1422 case ISCSI_ASYNC_EVENT_SCSI_EVENT: 1423 /* 1424 * SCSI asynchronous event is reported in 1425 * the sense data. Sense data that accompanies 1426 * the report in the data segment identifies the 1427 * condition. If the target supports SCSI 1428 * asynchronous events reporting (see [SAM2]) 1429 * as indicated in the stardard INQUIRY data 1430 * (see [SPC3]), its use may be enabled by 1431 * parameters in the SCSI control mode page 1432 * (see [SPC3]). 1433 * 1434 * T-10 has removed SCSI asunchronous events 1435 * from the standard. Although we have seen 1436 * a couple targets still spending these requests. 1437 * Those targets were specifically sending them 1438 * for notification of a LUN/Volume change 1439 * (ex. LUN addition/removal). Take a general 1440 * action to these events of dis/reconnecting. 1441 * Once reconnected we perform a reenumeration. 1442 */ 1443 idm_ini_conn_disconnect(ic); 1444 break; 1445 1446 case ISCSI_ASYNC_EVENT_REQUEST_LOGOUT: 1447 /* 1448 * We've been asked to logout by the target -- 1449 * we need to treat this differently from a normal logout 1450 * due to a discovery failure. Normal logouts result in 1451 * an N3 event to the session state machine and an offline 1452 * of the lun. In this case we want to put the connection 1453 * into "failed" state and generate N5 to the session state 1454 * machine since the initiator logged out at the target's 1455 * request. To track this we set a flag indicating we 1456 * received this async logout request from the tharget 1457 */ 1458 mutex_enter(&icp->conn_state_mutex); 1459 icp->conn_async_logout = B_TRUE; 1460 mutex_exit(&icp->conn_state_mutex); 1461 1462 /* Hold is released in iscsi_handle_logout. */ 1463 idm_conn_hold(ic); 1464 1465 /* Target has requested this connection to logout. */ 1466 itp = kmem_zalloc(sizeof (iscsi_task_t), KM_SLEEP); 1467 itp->t_arg = icp; 1468 itp->t_blocking = B_FALSE; 1469 if (ddi_taskq_dispatch(isp->sess_taskq, 1470 (void(*)())iscsi_logout_start, itp, DDI_SLEEP) != 1471 DDI_SUCCESS) { 1472 idm_conn_rele(ic); 1473 /* Disconnect if we couldn't dispatch the task */ 1474 idm_ini_conn_disconnect(ic); 1475 } 1476 break; 1477 1478 case ISCSI_ASYNC_EVENT_DROPPING_CONNECTION: 1479 /* 1480 * Target is going to drop our connection. 1481 * param1 - CID which will be dropped. 1482 * param2 - Min time to reconnect. 1483 * param3 - Max time to reconnect. 1484 * 1485 * For now just let fail as another disconnect. 1486 * 1487 * MC/S Once we support > 1 connections then 1488 * we need to check the CID and drop that 1489 * specific connection. 1490 */ 1491 iscsi_conn_set_login_min_max(icp, iaehp->param2, 1492 iaehp->param3); 1493 idm_ini_conn_disconnect(ic); 1494 break; 1495 1496 case ISCSI_ASYNC_EVENT_DROPPING_ALL_CONNECTIONS: 1497 /* 1498 * Target is going to drop ALL connections. 1499 * param2 - Min time to reconnect. 1500 * param3 - Max time to reconnect. 1501 * 1502 * For now just let fail as anyother disconnect. 1503 * 1504 * MC/S Once we support more than > 1 connections 1505 * then we need to drop all connections on the 1506 * session. 1507 */ 1508 iscsi_conn_set_login_min_max(icp, iaehp->param2, 1509 iaehp->param3); 1510 idm_ini_conn_disconnect(ic); 1511 break; 1512 1513 case ISCSI_ASYNC_EVENT_PARAM_NEGOTIATION: 1514 /* 1515 * Target requests parameter negotiation 1516 * on this connection. 1517 * 1518 * The initiator must honor this request. For 1519 * now we will request a logout. We can't 1520 * just ignore this or it might force corruption? 1521 */ 1522 1523 /* Hold is released in iscsi_handle_logout */ 1524 idm_conn_hold(ic); 1525 itp = kmem_zalloc(sizeof (iscsi_task_t), KM_SLEEP); 1526 itp->t_arg = icp; 1527 itp->t_blocking = B_FALSE; 1528 if (ddi_taskq_dispatch(isp->sess_taskq, 1529 (void(*)())iscsi_logout_start, itp, DDI_SLEEP) != 1530 DDI_SUCCESS) { 1531 /* Disconnect if we couldn't dispatch the task */ 1532 idm_conn_rele(ic); 1533 idm_ini_conn_disconnect(ic); 1534 } 1535 break; 1536 1537 case ISCSI_ASYNC_EVENT_VENDOR_SPECIFIC: 1538 /* 1539 * We currently don't handle any vendor 1540 * specific async events. So just ignore 1541 * the request. 1542 */ 1543 idm_ini_conn_disconnect(ic); 1544 break; 1545 default: 1546 rval = IDM_STATUS_PROTOCOL_ERROR; 1547 } 1548 1549 return (rval); 1550 } 1551 1552 /* 1553 * iscsi_rx_process_text_rsp - processes iSCSI text response. It sets 1554 * the cmd_result field of the command data structure with the actual 1555 * status value instead of returning the status value. The return value 1556 * is SUCCESS in order to let iscsi_handle_text control the operation of 1557 * a text request. 1558 * Text requests are a handled a little different than other types of 1559 * iSCSI commands because the initiator sends additional empty text requests 1560 * in order to obtain the remaining responses required to complete the 1561 * request. iscsi_handle_text controls the operation of text request, while 1562 * iscsi_rx_process_text_rsp just process the current response. 1563 */ 1564 static idm_status_t 1565 iscsi_rx_process_text_rsp(idm_conn_t *ic, idm_pdu_t *pdu) 1566 { 1567 iscsi_sess_t *isp = NULL; 1568 iscsi_text_rsp_hdr_t *ithp = 1569 (iscsi_text_rsp_hdr_t *)pdu->isp_hdr; 1570 iscsi_conn_t *icp = ic->ic_handle; 1571 iscsi_cmd_t *icmdp = NULL; 1572 boolean_t final = B_FALSE; 1573 uint32_t data_len; 1574 uint8_t *data = pdu->isp_data; 1575 idm_status_t rval; 1576 1577 isp = icp->conn_sess; 1578 1579 mutex_enter(&icp->conn_queue_active.mutex); 1580 if ((rval = iscsi_rx_chk(icp, isp, (iscsi_scsi_rsp_hdr_t *)ithp, 1581 &icmdp)) != IDM_STATUS_SUCCESS) { 1582 mutex_exit(&icp->conn_queue_active.mutex); 1583 return (rval); 1584 } 1585 1586 /* update local final response flag */ 1587 if (ithp->flags & ISCSI_FLAG_FINAL) { 1588 final = B_TRUE; 1589 } 1590 1591 /* 1592 * validate received TTT value. RFC3720 specifies the following: 1593 * - F bit set to 1 MUST have a reserved TTT value 0xffffffff 1594 * - F bit set to 0 MUST have a non-reserved TTT value !0xffffffff 1595 * In addition, the received TTT value must not change between 1596 * responses of a long text response 1597 */ 1598 if (((final == B_TRUE) && (ithp->ttt != ISCSI_RSVD_TASK_TAG)) || 1599 ((final == B_FALSE) && (ithp->ttt == ISCSI_RSVD_TASK_TAG))) { 1600 icmdp->cmd_result = ISCSI_STATUS_PROTOCOL_ERROR; 1601 icmdp->cmd_un.text.stage = ISCSI_CMD_TEXT_FINAL_RSP; 1602 mutex_exit(&icp->conn_queue_active.mutex); 1603 cmn_err(CE_WARN, "iscsi connection(%u) protocol error - " 1604 "received text response with invalid flags:0x%x or " 1605 "ttt:0x%x", icp->conn_oid, ithp->flags, ithp->itt); 1606 return (IDM_STATUS_PROTOCOL_ERROR); 1607 } 1608 1609 if ((icmdp->cmd_un.text.stage == ISCSI_CMD_TEXT_INITIAL_REQ) && 1610 (ithp->ttt == ISCSI_RSVD_TASK_TAG) && 1611 (final == B_FALSE)) { 1612 /* TTT should have matched reserved value */ 1613 icmdp->cmd_result = ISCSI_STATUS_PROTOCOL_ERROR; 1614 icmdp->cmd_un.text.stage = ISCSI_CMD_TEXT_FINAL_RSP; 1615 mutex_exit(&icp->conn_queue_active.mutex); 1616 cmn_err(CE_WARN, "iscsi connection(%u) protocol " 1617 "error - received text response with invalid " 1618 "ttt:0x%x", icp->conn_oid, ithp->ttt); 1619 return (IDM_STATUS_PROTOCOL_ERROR); 1620 } 1621 1622 /* 1623 * If this is first response, save away TTT value for later use 1624 * in a long text request/response sequence 1625 */ 1626 if (icmdp->cmd_un.text.stage == ISCSI_CMD_TEXT_INITIAL_REQ) { 1627 icmdp->cmd_un.text.ttt = ithp->ttt; 1628 } 1629 1630 data_len = ntoh24(ithp->dlength); 1631 1632 /* check whether enough buffer available to copy data */ 1633 if ((icmdp->cmd_un.text.total_rx_len + data_len) > 1634 icmdp->cmd_un.text.buf_len) { 1635 icmdp->cmd_un.text.total_rx_len += data_len; 1636 icmdp->cmd_result = ISCSI_STATUS_DATA_OVERFLOW; 1637 /* 1638 * DATA_OVERFLOW will result in a SUCCESS return so that 1639 * iscsi_handle_text can continue to obtain the remaining 1640 * text response if needed. 1641 */ 1642 } else { 1643 char *buf_data = (icmdp->cmd_un.text.buf + 1644 icmdp->cmd_un.text.offset); 1645 1646 bcopy(data, buf_data, data_len); 1647 icmdp->cmd_un.text.offset += data_len; 1648 icmdp->cmd_un.text.total_rx_len += data_len; 1649 icmdp->cmd_result = ISCSI_STATUS_SUCCESS; 1650 bcopy(ithp->rsvd4, icmdp->cmd_un.text.lun, 1651 sizeof (icmdp->cmd_un.text.lun)); 1652 } 1653 1654 /* update stage */ 1655 if (final == B_TRUE) { 1656 icmdp->cmd_un.text.stage = ISCSI_CMD_TEXT_FINAL_RSP; 1657 } else { 1658 icmdp->cmd_un.text.stage = ISCSI_CMD_TEXT_CONTINUATION; 1659 } 1660 1661 iscsi_cmd_state_machine(icmdp, ISCSI_CMD_EVENT_E3, isp); 1662 mutex_exit(&icp->conn_queue_active.mutex); 1663 return (IDM_STATUS_SUCCESS); 1664 } 1665 1666 /* 1667 * iscsi_rx_process_scsi_itt_to_icmdp - Lookup itt using IDM to find matching 1668 * icmdp. Verify itt in hdr and icmdp are the same. 1669 */ 1670 static iscsi_status_t 1671 iscsi_rx_process_scsi_itt_to_icmdp(iscsi_sess_t *isp, idm_conn_t *ic, 1672 iscsi_scsi_rsp_hdr_t *ihp, iscsi_cmd_t **icmdp) 1673 { 1674 idm_task_t *itp; 1675 1676 ASSERT(isp != NULL); 1677 ASSERT(ihp != NULL); 1678 ASSERT(icmdp != NULL); 1679 ASSERT(mutex_owned(&isp->sess_cmdsn_mutex)); 1680 itp = idm_task_find_and_complete(ic, ihp->itt, ISCSI_INI_TASK_TTT); 1681 if (itp == NULL) { 1682 cmn_err(CE_WARN, "iscsi session(%u) protocol error - " 1683 "received unknown itt:0x%x - protocol error", 1684 isp->sess_oid, ihp->itt); 1685 return (ISCSI_STATUS_INTERNAL_ERROR); 1686 } 1687 *icmdp = itp->idt_private; 1688 1689 idm_task_rele(itp); 1690 1691 return (ISCSI_STATUS_SUCCESS); 1692 1693 } 1694 1695 /* 1696 * iscsi_rx_process_itt_to_icmdp - Lookup itt in the session's 1697 * cmd table to find matching icmdp. Verify itt in hdr and 1698 * icmdp are the same. 1699 */ 1700 static iscsi_status_t 1701 iscsi_rx_process_itt_to_icmdp(iscsi_sess_t *isp, iscsi_hdr_t *ihp, 1702 iscsi_cmd_t **icmdp) 1703 { 1704 int cmd_table_idx = 0; 1705 1706 ASSERT(isp != NULL); 1707 ASSERT(ihp != NULL); 1708 ASSERT(icmdp != NULL); 1709 ASSERT(mutex_owned(&isp->sess_cmdsn_mutex)); 1710 1711 /* try to find an associated iscsi_pkt */ 1712 cmd_table_idx = (ihp->itt - IDM_TASKIDS_MAX) % ISCSI_CMD_TABLE_SIZE; 1713 if (isp->sess_cmd_table[cmd_table_idx] == NULL) { 1714 cmn_err(CE_WARN, "iscsi session(%u) protocol error - " 1715 "received unknown itt:0x%x - protocol error", 1716 isp->sess_oid, ihp->itt); 1717 return (ISCSI_STATUS_INTERNAL_ERROR); 1718 } 1719 1720 /* verify itt */ 1721 if (isp->sess_cmd_table[cmd_table_idx]->cmd_itt != ihp->itt) { 1722 cmn_err(CE_WARN, "iscsi session(%u) received itt:0x%x " 1723 " which is out of sync with itt:0x%x", isp->sess_oid, 1724 ihp->itt, isp->sess_cmd_table[cmd_table_idx]->cmd_itt); 1725 return (ISCSI_STATUS_INTERNAL_ERROR); 1726 } 1727 1728 /* ensure that icmdp is still in Active state */ 1729 if (isp->sess_cmd_table[cmd_table_idx]->cmd_state != 1730 ISCSI_CMD_STATE_ACTIVE) { 1731 cmn_err(CE_WARN, "iscsi session(%u) received itt:0x%x " 1732 "but icmdp (%p) is not in active state", 1733 isp->sess_oid, ihp->itt, 1734 (void *)isp->sess_cmd_table[cmd_table_idx]); 1735 return (ISCSI_STATUS_INTERNAL_ERROR); 1736 } 1737 1738 /* make sure this is a SCSI cmd */ 1739 *icmdp = isp->sess_cmd_table[cmd_table_idx]; 1740 1741 return (ISCSI_STATUS_SUCCESS); 1742 } 1743 1744 /* 1745 * +--------------------------------------------------------------------+ 1746 * | End of protocol receive routines | 1747 * +--------------------------------------------------------------------+ 1748 */ 1749 1750 /* 1751 * +--------------------------------------------------------------------+ 1752 * | Beginning of protocol send routines | 1753 * +--------------------------------------------------------------------+ 1754 */ 1755 1756 1757 /* 1758 * iscsi_tx_thread - This thread is the driving point for all 1759 * iSCSI PDUs after login. No PDUs should call idm_pdu_tx() 1760 * directly they should be funneled through iscsi_tx_thread. 1761 */ 1762 void 1763 iscsi_tx_thread(iscsi_thread_t *thread, void *arg) 1764 { 1765 iscsi_conn_t *icp = (iscsi_conn_t *)arg; 1766 iscsi_sess_t *isp = NULL; 1767 iscsi_cmd_t *icmdp = NULL; 1768 clock_t tout; 1769 int ret = 1; 1770 1771 ASSERT(icp != NULL); 1772 isp = icp->conn_sess; 1773 ASSERT(isp != NULL); 1774 ASSERT(thread != NULL); 1775 ASSERT(thread->signature == SIG_ISCSI_THREAD); 1776 1777 tout = SEC_TO_TICK(1); 1778 /* 1779 * Transfer icmdps until shutdown by owning session. 1780 */ 1781 while (ret != 0) { 1782 1783 isp->sess_window_open = B_TRUE; 1784 /* 1785 * While the window is open, there are commands available 1786 * to send and the session state allows those commands to 1787 * be sent try to transfer them. 1788 */ 1789 mutex_enter(&isp->sess_queue_pending.mutex); 1790 while ((isp->sess_window_open == B_TRUE) && 1791 ((icmdp = isp->sess_queue_pending.head) != NULL) && 1792 (((icmdp->cmd_type != ISCSI_CMD_TYPE_SCSI) && 1793 (ISCSI_CONN_STATE_FULL_FEATURE(icp->conn_state))) || 1794 (icp->conn_state == ISCSI_CONN_STATE_LOGGED_IN))) { 1795 1796 /* update command with this connection info */ 1797 icmdp->cmd_conn = icp; 1798 /* attempt to send this command */ 1799 iscsi_cmd_state_machine(icmdp, ISCSI_CMD_EVENT_E2, isp); 1800 1801 ASSERT(!mutex_owned(&isp->sess_queue_pending.mutex)); 1802 mutex_enter(&isp->sess_queue_pending.mutex); 1803 } 1804 mutex_exit(&isp->sess_queue_pending.mutex); 1805 1806 /* 1807 * Go to sleep until there is something new 1808 * to process (awoken via cv_boardcast). 1809 * Or the timer goes off. 1810 */ 1811 ret = iscsi_thread_wait(thread, tout); 1812 } 1813 1814 } 1815 1816 1817 /* 1818 * iscsi_tx_cmd - transfers icmdp across wire as iscsi pdu 1819 * 1820 * Just prior to sending the command to the networking layer the 1821 * pending queue lock will be dropped. At this point only local 1822 * resources will be used, not the icmdp. Holding the queue lock 1823 * across the networking call can lead to a hang. (This is due 1824 * to the the target driver and networking layers competing use 1825 * of the timeout() resources and the queue lock being held for 1826 * both sides.) Upon the completion of this command the lock 1827 * will have been re-acquired. 1828 */ 1829 iscsi_status_t 1830 iscsi_tx_cmd(iscsi_sess_t *isp, iscsi_cmd_t *icmdp) 1831 { 1832 iscsi_status_t rval = ISCSI_STATUS_INTERNAL_ERROR; 1833 1834 ASSERT(isp != NULL); 1835 ASSERT(icmdp != NULL); 1836 1837 /* transfer specific command type */ 1838 switch (icmdp->cmd_type) { 1839 case ISCSI_CMD_TYPE_SCSI: 1840 rval = iscsi_tx_scsi(isp, icmdp); 1841 break; 1842 case ISCSI_CMD_TYPE_NOP: 1843 rval = iscsi_tx_nop(isp, icmdp); 1844 break; 1845 case ISCSI_CMD_TYPE_ABORT: 1846 rval = iscsi_tx_abort(isp, icmdp); 1847 break; 1848 case ISCSI_CMD_TYPE_RESET: 1849 rval = iscsi_tx_reset(isp, icmdp); 1850 break; 1851 case ISCSI_CMD_TYPE_LOGOUT: 1852 rval = iscsi_tx_logout(isp, icmdp); 1853 break; 1854 case ISCSI_CMD_TYPE_TEXT: 1855 rval = iscsi_tx_text(isp, icmdp); 1856 break; 1857 default: 1858 cmn_err(CE_WARN, "iscsi_tx_cmd: invalid cmdtype: %d", 1859 icmdp->cmd_type); 1860 ASSERT(FALSE); 1861 } 1862 1863 ASSERT(!mutex_owned(&isp->sess_queue_pending.mutex)); 1864 return (rval); 1865 } 1866 1867 /* 1868 * a variable length cdb can be up to 16K, but we obviously don't want 1869 * to put that on the stack; go with 200 bytes; if we get something 1870 * bigger than that we will kmem_alloc a buffer 1871 */ 1872 #define DEF_CDB_LEN 200 1873 1874 /* 1875 * given the size of the cdb, return how many bytes the header takes, 1876 * which is the sizeof addl_hdr_t + the CDB size, minus the 16 bytes 1877 * stored in the basic header, minus sizeof (ahs_extscb) 1878 */ 1879 #define ADDLHDRSZ(x) (sizeof (iscsi_addl_hdr_t) + (x) - \ 1880 16 - 4) 1881 1882 static void 1883 iscsi_tx_init_hdr(iscsi_sess_t *isp, iscsi_conn_t *icp, 1884 iscsi_text_hdr_t *ihp, int opcode, iscsi_cmd_t *icmdp) 1885 { 1886 ihp->opcode = opcode; 1887 ihp->itt = icmdp->cmd_itt; 1888 mutex_enter(&isp->sess_cmdsn_mutex); 1889 icmdp->cmd_sn = isp->sess_cmdsn; 1890 ihp->cmdsn = htonl(isp->sess_cmdsn); 1891 isp->sess_cmdsn++; 1892 mutex_exit(&isp->sess_cmdsn_mutex); 1893 ihp->expstatsn = htonl(icp->conn_expstatsn); 1894 icp->conn_laststatsn = icp->conn_expstatsn; 1895 } 1896 1897 1898 static void 1899 iscsi_tx_scsi_data(iscsi_cmd_t *icmdp, iscsi_scsi_cmd_hdr_t *ihp, 1900 iscsi_conn_t *icp, idm_pdu_t *pdu) 1901 { 1902 struct buf *bp = NULL; 1903 size_t buflen = 0; 1904 uint32_t first_burst_length = 0; 1905 struct scsi_pkt *pkt; 1906 1907 pkt = icmdp->cmd_un.scsi.pkt; 1908 bp = icmdp->cmd_un.scsi.bp; 1909 if ((bp != NULL) && bp->b_bcount) { 1910 buflen = bp->b_bcount; 1911 first_burst_length = 1912 icp->conn_params.first_burst_length; 1913 1914 if (bp->b_flags & B_READ) { 1915 ihp->flags = ISCSI_FLAG_FINAL; 1916 /* 1917 * fix problem where OS sends bp (B_READ & 1918 * b_bcount!=0) for a TUR or START_STOP. 1919 * (comment came from cisco code.) 1920 */ 1921 if ((pkt->pkt_cdbp[0] != SCMD_TEST_UNIT_READY) && 1922 (pkt->pkt_cdbp[0] != SCMD_START_STOP)) { 1923 ihp->flags |= ISCSI_FLAG_CMD_READ; 1924 ihp->data_length = htonl(buflen); 1925 } 1926 } else { 1927 ihp->flags = ISCSI_FLAG_CMD_WRITE; 1928 /* 1929 * FinalBit on the the iSCSI PDU denotes this 1930 * is the last PDU in the sequence. 1931 * 1932 * initial_r2t = true means R2T is required 1933 * for additional PDU, so there will be no more 1934 * unsolicited PDUs following 1935 */ 1936 if (icp->conn_params.initial_r2t) { 1937 ihp->flags |= ISCSI_FLAG_FINAL; 1938 } 1939 1940 /* Check if we should send ImmediateData */ 1941 if (icp->conn_params.immediate_data) { 1942 pdu->isp_data = 1943 (uint8_t *)icmdp-> 1944 cmd_un.scsi.bp->b_un.b_addr; 1945 1946 pdu->isp_datalen = MIN(MIN(buflen, 1947 first_burst_length), 1948 icmdp->cmd_conn->conn_params. 1949 max_xmit_data_seg_len); 1950 1951 /* 1952 * if everything fits immediate, or 1953 * we can send all burst data immediate 1954 * (not unsol), set F 1955 */ 1956 /* 1957 * XXX This doesn't look right -- it's not 1958 * clear how we can handle transmitting 1959 * any unsolicited data. It looks like 1960 * we only support immediate data. So what 1961 * happens if we don't set ISCSI_FLAG_FINAL? 1962 * 1963 * Unless there's magic code somewhere that 1964 * is sending the remaining PDU's we should 1965 * simply set ISCSI_FLAG_FINAL and forget 1966 * about sending unsolicited data. The big 1967 * win is the immediate data anyway for small 1968 * PDU's. 1969 */ 1970 if ((pdu->isp_datalen == buflen) || 1971 (pdu->isp_datalen == first_burst_length)) { 1972 ihp->flags |= ISCSI_FLAG_FINAL; 1973 } 1974 1975 hton24(ihp->dlength, pdu->isp_datalen); 1976 } 1977 /* total data transfer length */ 1978 ihp->data_length = htonl(buflen); 1979 } 1980 } else { 1981 ihp->flags = ISCSI_FLAG_FINAL; 1982 } 1983 icmdp->cmd_un.scsi.data_transferred += pdu->isp_datalen; 1984 /* XXX How is this different from the code above? */ 1985 /* will idm send the next data command up to burst length? */ 1986 /* send the burstlen if we haven't sent immediate data */ 1987 /* CRM: should idm send difference min(buflen, first_burst) and imm? */ 1988 /* (MIN(first_burst_length, buflen) - imdata > 0) */ 1989 /* CRM_LATER: change this to generate unsolicited pdu */ 1990 if ((buflen > 0) && 1991 ((bp->b_flags & B_READ) == 0) && 1992 (icp->conn_params.initial_r2t == 0) && 1993 pdu->isp_datalen == 0) { 1994 1995 pdu->isp_datalen = MIN(first_burst_length, buflen); 1996 if ((pdu->isp_datalen == buflen) || 1997 (pdu->isp_datalen == first_burst_length)) { 1998 ihp->flags |= ISCSI_FLAG_FINAL; 1999 } 2000 pdu->isp_data = (uint8_t *)icmdp->cmd_un.scsi.bp->b_un.b_addr; 2001 hton24(ihp->dlength, pdu->isp_datalen); 2002 } 2003 } 2004 2005 static void 2006 iscsi_tx_scsi_init_pkt(iscsi_cmd_t *icmdp, iscsi_scsi_cmd_hdr_t *ihp) 2007 { 2008 struct scsi_pkt *pkt; 2009 2010 pkt = icmdp->cmd_un.scsi.pkt; 2011 pkt->pkt_state = (STATE_GOT_BUS | STATE_GOT_TARGET); 2012 pkt->pkt_reason = CMD_INCOMPLETE; 2013 2014 /* tagged queuing */ 2015 if (pkt->pkt_flags & FLAG_HTAG) { 2016 ihp->flags |= ISCSI_ATTR_HEAD_OF_QUEUE; 2017 } else if (pkt->pkt_flags & FLAG_OTAG) { 2018 ihp->flags |= ISCSI_ATTR_ORDERED; 2019 } else if (pkt->pkt_flags & FLAG_STAG) { 2020 ihp->flags |= ISCSI_ATTR_SIMPLE; 2021 } else { 2022 /* ihp->flags |= ISCSI_ATTR_UNTAGGED; */ 2023 /* EMPTY */ 2024 } 2025 2026 /* iscsi states lun is based on spc.2 */ 2027 ISCSI_LUN_BYTE_COPY(ihp->lun, icmdp->cmd_un.scsi.lun); 2028 2029 if (icmdp->cmd_un.scsi.cmdlen <= 16) { 2030 /* copy the SCSI Command Block into the PDU */ 2031 bcopy(pkt->pkt_cdbp, ihp->scb, 2032 icmdp->cmd_un.scsi.cmdlen); 2033 } else { 2034 iscsi_addl_hdr_t *iahp; 2035 2036 iahp = (iscsi_addl_hdr_t *)ihp; 2037 2038 ihp->hlength = (ADDLHDRSZ(icmdp->cmd_un.scsi.cmdlen) - 2039 sizeof (iscsi_scsi_cmd_hdr_t) + 3) / 4; 2040 iahp->ahs_hlen_hi = 0; 2041 iahp->ahs_hlen_lo = (icmdp->cmd_un.scsi.cmdlen - 15); 2042 iahp->ahs_key = 0x01; 2043 iahp->ahs_resv = 0; 2044 bcopy(pkt->pkt_cdbp, ihp->scb, 16); 2045 bcopy(((char *)pkt->pkt_cdbp) + 16, &iahp->ahs_extscb[0], 2046 icmdp->cmd_un.scsi.cmdlen); 2047 } 2048 2049 /* 2050 * Update all values before transfering. 2051 * We should never touch the icmdp after 2052 * transfering if there is no more data 2053 * to send. The only case the idm_pdu_tx() 2054 * will fail is a on a connection disconnect 2055 * in that case the command will be flushed. 2056 */ 2057 pkt->pkt_state |= STATE_SENT_CMD; 2058 } 2059 2060 static void 2061 iscsi_tx_scsi_init_task(iscsi_cmd_t *icmdp, iscsi_conn_t *icp, 2062 iscsi_scsi_cmd_hdr_t *ihp) 2063 { 2064 idm_task_t *itp; 2065 struct buf *bp = NULL; 2066 uint32_t data_length; 2067 2068 bp = icmdp->cmd_un.scsi.bp; 2069 2070 itp = icmdp->cmd_itp; 2071 ASSERT(itp != NULL); 2072 data_length = ntohl(ihp->data_length); 2073 ISCSI_IO_LOG(CE_NOTE, 2074 "DEBUG: iscsi_tx_init_task: task_start: %p idt_tt: %x cmdsn: %x " 2075 "sess_cmdsn: %x cmd: %p " 2076 "cmdtype: %d datalen: %u", 2077 (void *)itp, itp->idt_tt, ihp->cmdsn, icp->conn_sess->sess_cmdsn, 2078 (void *)icmdp, icmdp->cmd_type, data_length); 2079 if (data_length > 0) { 2080 if (bp->b_flags & B_READ) { 2081 icmdp->cmd_un.scsi.ibp_ibuf = 2082 idm_buf_alloc(icp->conn_ic, 2083 bp->b_un.b_addr, bp->b_bcount); 2084 if (icmdp->cmd_un.scsi.ibp_ibuf) 2085 idm_buf_bind_in(itp, 2086 icmdp->cmd_un.scsi.ibp_ibuf); 2087 } else { 2088 icmdp->cmd_un.scsi.ibp_obuf = 2089 idm_buf_alloc(icp->conn_ic, 2090 bp->b_un.b_addr, bp->b_bcount); 2091 if (icmdp->cmd_un.scsi.ibp_obuf) 2092 idm_buf_bind_out(itp, 2093 icmdp->cmd_un.scsi.ibp_obuf); 2094 } 2095 ISCSI_IO_LOG(CE_NOTE, 2096 "DEBUG: pdu_tx: task_start(%s): %p ic: %p idt_tt: %x " 2097 "cmdsn: %x sess_cmdsn: %x sess_expcmdsn: %x obuf: %p " 2098 "cmdp: %p cmdtype: %d " 2099 "buflen: %lu " "bpaddr: %p datalen: %u ", 2100 bp->b_flags & B_READ ? "B_READ" : "B_WRITE", 2101 (void *)itp, (void *)icp->conn_ic, 2102 itp->idt_tt, ihp->cmdsn, 2103 icp->conn_sess->sess_cmdsn, 2104 icp->conn_sess->sess_expcmdsn, 2105 (void *)icmdp->cmd_un.scsi.ibp_ibuf, 2106 (void *)icmdp, icmdp->cmd_type, bp->b_bcount, 2107 (void *)bp->b_un.b_addr, 2108 data_length); 2109 } 2110 2111 /* 2112 * Task is now active 2113 */ 2114 idm_task_start(itp, ISCSI_INI_TASK_TTT); 2115 } 2116 2117 /* 2118 * iscsi_tx_scsi - 2119 * 2120 */ 2121 static iscsi_status_t 2122 iscsi_tx_scsi(iscsi_sess_t *isp, iscsi_cmd_t *icmdp) 2123 { 2124 iscsi_status_t rval = ISCSI_STATUS_SUCCESS; 2125 iscsi_conn_t *icp = NULL; 2126 struct scsi_pkt *pkt = NULL; 2127 iscsi_scsi_cmd_hdr_t *ihp = NULL; 2128 int cdblen = 0; 2129 idm_pdu_t *pdu; 2130 int len; 2131 2132 ASSERT(isp != NULL); 2133 ASSERT(icmdp != NULL); 2134 2135 pdu = kmem_zalloc(sizeof (idm_pdu_t), KM_SLEEP); 2136 2137 pkt = icmdp->cmd_un.scsi.pkt; 2138 ASSERT(pkt != NULL); 2139 icp = icmdp->cmd_conn; 2140 ASSERT(icp != NULL); 2141 2142 /* Reset counts in case we are on a retry */ 2143 icmdp->cmd_un.scsi.data_transferred = 0; 2144 2145 if (icmdp->cmd_un.scsi.cmdlen > DEF_CDB_LEN) { 2146 cdblen = icmdp->cmd_un.scsi.cmdlen; 2147 ihp = kmem_zalloc(ADDLHDRSZ(cdblen), KM_SLEEP); 2148 len = ADDLHDRSZ(cdblen); 2149 } else { 2150 /* 2151 * only bzero the basic header; the additional header 2152 * will be set up correctly later, if needed 2153 */ 2154 ihp = kmem_zalloc(sizeof (iscsi_scsi_cmd_hdr_t), KM_SLEEP); 2155 len = sizeof (iscsi_scsi_cmd_hdr_t); 2156 } 2157 2158 iscsi_tx_init_hdr(isp, icp, (iscsi_text_hdr_t *)ihp, 2159 ISCSI_OP_SCSI_CMD, icmdp); 2160 2161 idm_pdu_init(pdu, icp->conn_ic, (void *)icmdp, &iscsi_tx_done); 2162 idm_pdu_init_hdr(pdu, (uint8_t *)ihp, len); 2163 pdu->isp_data = NULL; 2164 pdu->isp_datalen = 0; 2165 2166 /* 2167 * Sestion 12.11 of the iSCSI specification has a good table 2168 * describing when uncolicited data and/or immediate data 2169 * should be sent. 2170 */ 2171 2172 iscsi_tx_scsi_data(icmdp, ihp, icp, pdu); 2173 2174 iscsi_tx_scsi_init_pkt(icmdp, ihp); 2175 2176 /* Calls idm_task_start */ 2177 iscsi_tx_scsi_init_task(icmdp, icp, ihp); 2178 2179 mutex_exit(&isp->sess_queue_pending.mutex); 2180 2181 idm_pdu_tx(pdu); 2182 2183 icmdp->cmd_misc_flags |= ISCSI_CMD_MISCFLAG_SENT; 2184 2185 return (rval); 2186 } 2187 2188 2189 /* ARGSUSED */ 2190 static void 2191 iscsi_tx_done(idm_pdu_t *pdu, idm_status_t status) 2192 { 2193 kmem_free((iscsi_hdr_t *)pdu->isp_hdr, pdu->isp_hdrlen); 2194 kmem_free(pdu, sizeof (idm_pdu_t)); 2195 } 2196 2197 2198 static void 2199 iscsi_tx_pdu(iscsi_conn_t *icp, int opcode, void *hdr, int hdrlen, 2200 iscsi_cmd_t *icmdp) 2201 { 2202 idm_pdu_t *tx_pdu; 2203 iscsi_hdr_t *ihp = (iscsi_hdr_t *)hdr; 2204 2205 tx_pdu = kmem_zalloc(sizeof (idm_pdu_t), KM_SLEEP); 2206 ASSERT(tx_pdu != NULL); 2207 2208 idm_pdu_init(tx_pdu, icp->conn_ic, icmdp, &iscsi_tx_done); 2209 idm_pdu_init_hdr(tx_pdu, hdr, hdrlen); 2210 if (opcode == ISCSI_OP_TEXT_CMD) { 2211 idm_pdu_init_data(tx_pdu, 2212 (uint8_t *)icmdp->cmd_un.text.buf, 2213 ntoh24(ihp->dlength)); 2214 } 2215 2216 mutex_exit(&icp->conn_sess->sess_queue_pending.mutex); 2217 idm_pdu_tx(tx_pdu); 2218 icmdp->cmd_misc_flags |= ISCSI_CMD_MISCFLAG_SENT; 2219 } 2220 2221 2222 /* 2223 * iscsi_tx_nop - 2224 * 2225 */ 2226 static iscsi_status_t 2227 iscsi_tx_nop(iscsi_sess_t *isp, iscsi_cmd_t *icmdp) 2228 { 2229 iscsi_status_t rval = ISCSI_STATUS_SUCCESS; 2230 iscsi_conn_t *icp = NULL; 2231 iscsi_nop_out_hdr_t *inohp; 2232 2233 ASSERT(isp != NULL); 2234 ASSERT(icmdp != NULL); 2235 icp = icmdp->cmd_conn; 2236 ASSERT(icp != NULL); 2237 2238 inohp = kmem_zalloc(sizeof (iscsi_nop_out_hdr_t), KM_SLEEP); 2239 ASSERT(inohp != NULL); 2240 2241 inohp->opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; 2242 inohp->flags = ISCSI_FLAG_FINAL; 2243 inohp->itt = icmdp->cmd_itt; 2244 inohp->ttt = icmdp->cmd_ttt; 2245 mutex_enter(&isp->sess_cmdsn_mutex); 2246 icmdp->cmd_sn = isp->sess_cmdsn; 2247 inohp->cmdsn = htonl(isp->sess_cmdsn); 2248 mutex_exit(&isp->sess_cmdsn_mutex); 2249 inohp->expstatsn = htonl(icp->conn_expstatsn); 2250 icp->conn_laststatsn = icp->conn_expstatsn; 2251 iscsi_tx_pdu(icp, ISCSI_OP_NOOP_OUT, inohp, 2252 sizeof (iscsi_nop_out_hdr_t), icmdp); 2253 return (rval); 2254 } 2255 2256 2257 /* 2258 * iscsi_tx_abort - 2259 * 2260 */ 2261 static iscsi_status_t 2262 iscsi_tx_abort(iscsi_sess_t *isp, iscsi_cmd_t *icmdp) 2263 { 2264 iscsi_status_t rval = ISCSI_STATUS_SUCCESS; 2265 iscsi_conn_t *icp = NULL; 2266 iscsi_scsi_task_mgt_hdr_t *istmh; 2267 2268 ASSERT(isp != NULL); 2269 ASSERT(icmdp != NULL); 2270 icp = icmdp->cmd_conn; 2271 ASSERT(icp != NULL); 2272 2273 istmh = kmem_zalloc(sizeof (iscsi_scsi_task_mgt_hdr_t), KM_SLEEP); 2274 ASSERT(istmh != NULL); 2275 mutex_enter(&isp->sess_cmdsn_mutex); 2276 icmdp->cmd_sn = isp->sess_cmdsn; 2277 istmh->cmdsn = htonl(isp->sess_cmdsn); 2278 mutex_exit(&isp->sess_cmdsn_mutex); 2279 istmh->expstatsn = htonl(icp->conn_expstatsn); 2280 icp->conn_laststatsn = icp->conn_expstatsn; 2281 istmh->itt = icmdp->cmd_itt; 2282 istmh->opcode = ISCSI_OP_SCSI_TASK_MGT_MSG | ISCSI_OP_IMMEDIATE; 2283 istmh->function = ISCSI_FLAG_FINAL | ISCSI_TM_FUNC_ABORT_TASK; 2284 ISCSI_LUN_BYTE_COPY(istmh->lun, 2285 icmdp->cmd_un.abort.icmdp->cmd_un.scsi.lun); 2286 istmh->rtt = icmdp->cmd_un.abort.icmdp->cmd_itt; 2287 iscsi_tx_pdu(icp, ISCSI_OP_SCSI_TASK_MGT_MSG, istmh, 2288 sizeof (iscsi_scsi_task_mgt_hdr_t), icmdp); 2289 2290 return (rval); 2291 } 2292 2293 2294 /* 2295 * iscsi_tx_reset - 2296 * 2297 */ 2298 static iscsi_status_t 2299 iscsi_tx_reset(iscsi_sess_t *isp, iscsi_cmd_t *icmdp) 2300 { 2301 iscsi_status_t rval = ISCSI_STATUS_SUCCESS; 2302 iscsi_conn_t *icp = NULL; 2303 iscsi_scsi_task_mgt_hdr_t *istmh; 2304 2305 ASSERT(isp != NULL); 2306 ASSERT(icmdp != NULL); 2307 icp = icmdp->cmd_conn; 2308 ASSERT(icp != NULL); 2309 2310 istmh = kmem_zalloc(sizeof (iscsi_scsi_task_mgt_hdr_t), KM_SLEEP); 2311 ASSERT(istmh != NULL); 2312 istmh->opcode = ISCSI_OP_SCSI_TASK_MGT_MSG | ISCSI_OP_IMMEDIATE; 2313 mutex_enter(&isp->sess_cmdsn_mutex); 2314 icmdp->cmd_sn = isp->sess_cmdsn; 2315 istmh->cmdsn = htonl(isp->sess_cmdsn); 2316 mutex_exit(&isp->sess_cmdsn_mutex); 2317 istmh->expstatsn = htonl(icp->conn_expstatsn); 2318 istmh->itt = icmdp->cmd_itt; 2319 2320 switch (icmdp->cmd_un.reset.level) { 2321 case RESET_LUN: 2322 istmh->function = ISCSI_FLAG_FINAL | 2323 ISCSI_TM_FUNC_LOGICAL_UNIT_RESET; 2324 ISCSI_LUN_BYTE_COPY(istmh->lun, icmdp->cmd_lun->lun_num); 2325 break; 2326 case RESET_TARGET: 2327 case RESET_BUS: 2328 istmh->function = ISCSI_FLAG_FINAL | 2329 ISCSI_TM_FUNC_TARGET_WARM_RESET; 2330 break; 2331 default: 2332 /* unsupported / unknown level */ 2333 ASSERT(FALSE); 2334 break; 2335 } 2336 2337 iscsi_tx_pdu(icp, ISCSI_OP_SCSI_TASK_MGT_MSG, istmh, 2338 sizeof (iscsi_scsi_task_mgt_hdr_t), icmdp); 2339 2340 return (rval); 2341 } 2342 2343 2344 /* 2345 * iscsi_tx_logout - 2346 * 2347 */ 2348 static iscsi_status_t 2349 iscsi_tx_logout(iscsi_sess_t *isp, iscsi_cmd_t *icmdp) 2350 { 2351 iscsi_status_t rval = ISCSI_STATUS_SUCCESS; 2352 iscsi_conn_t *icp = NULL; 2353 iscsi_logout_hdr_t *ilh; 2354 2355 ASSERT(isp != NULL); 2356 ASSERT(icmdp != NULL); 2357 icp = icmdp->cmd_conn; 2358 ASSERT(icp != NULL); 2359 2360 ilh = kmem_zalloc(sizeof (iscsi_logout_hdr_t), KM_SLEEP); 2361 ilh->opcode = ISCSI_OP_LOGOUT_CMD | ISCSI_OP_IMMEDIATE; 2362 ilh->flags = ISCSI_FLAG_FINAL | ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2363 ilh->itt = icmdp->cmd_itt; 2364 ilh->cid = icp->conn_cid; 2365 mutex_enter(&isp->sess_cmdsn_mutex); 2366 icmdp->cmd_sn = isp->sess_cmdsn; 2367 ilh->cmdsn = htonl(isp->sess_cmdsn); 2368 mutex_exit(&isp->sess_cmdsn_mutex); 2369 ilh->expstatsn = htonl(icp->conn_expstatsn); 2370 iscsi_tx_pdu(icp, ISCSI_OP_LOGOUT_CMD, ilh, 2371 sizeof (iscsi_logout_hdr_t), icmdp); 2372 2373 return (rval); 2374 } 2375 2376 /* 2377 * iscsi_tx_text - setup iSCSI text request header and send PDU with 2378 * data given in the buffer attached to the command. For a single 2379 * text request, the target may need to send its response in multiple 2380 * text response. In this case, empty text requests are sent after 2381 * each received response to notify the target the initiator is ready 2382 * for more response. For the initial request, the data_len field in 2383 * the text specific portion of a command is set to the amount of data 2384 * the initiator wants to send as part of the request. If additional 2385 * empty text requests are required for long responses, the data_len 2386 * field is set to 0 by the iscsi_handle_text function. 2387 */ 2388 static iscsi_status_t 2389 iscsi_tx_text(iscsi_sess_t *isp, iscsi_cmd_t *icmdp) 2390 { 2391 iscsi_status_t rval = ISCSI_STATUS_SUCCESS; 2392 iscsi_conn_t *icp = NULL; 2393 iscsi_text_hdr_t *ith; 2394 2395 ASSERT(icmdp != NULL); 2396 icp = icmdp->cmd_conn; 2397 ASSERT(icp != NULL); 2398 2399 ith = kmem_zalloc(sizeof (iscsi_text_hdr_t), KM_SLEEP); 2400 ASSERT(ith != NULL); 2401 ith->flags = ISCSI_FLAG_FINAL; 2402 hton24(ith->dlength, icmdp->cmd_un.text.data_len); 2403 ith->ttt = icmdp->cmd_un.text.ttt; 2404 iscsi_tx_init_hdr(isp, icp, (iscsi_text_hdr_t *)ith, 2405 ISCSI_OP_TEXT_CMD, icmdp); 2406 bcopy(icmdp->cmd_un.text.lun, ith->rsvd4, sizeof (ith->rsvd4)); 2407 2408 iscsi_tx_pdu(icp, ISCSI_OP_TEXT_CMD, ith, sizeof (iscsi_text_hdr_t), 2409 icmdp); 2410 2411 return (rval); 2412 } 2413 2414 /* 2415 * +--------------------------------------------------------------------+ 2416 * | End of protocol send routines | 2417 * +--------------------------------------------------------------------+ 2418 */ 2419 2420 /* 2421 * iscsi_handle_abort - 2422 * 2423 */ 2424 void 2425 iscsi_handle_abort(void *arg) 2426 { 2427 iscsi_sess_t *isp = NULL; 2428 iscsi_cmd_t *icmdp = (iscsi_cmd_t *)arg; 2429 iscsi_cmd_t *new_icmdp; 2430 iscsi_conn_t *icp; 2431 2432 ASSERT(icmdp != NULL); 2433 icp = icmdp->cmd_conn; 2434 ASSERT(icp != NULL); 2435 isp = icp->conn_sess; 2436 ASSERT(isp != NULL); 2437 2438 /* there should only be one abort */ 2439 ASSERT(icmdp->cmd_un.scsi.abort_icmdp == NULL); 2440 2441 new_icmdp = iscsi_cmd_alloc(icp, KM_SLEEP); 2442 new_icmdp->cmd_type = ISCSI_CMD_TYPE_ABORT; 2443 new_icmdp->cmd_lun = icmdp->cmd_lun; 2444 new_icmdp->cmd_un.abort.icmdp = icmdp; 2445 new_icmdp->cmd_conn = icmdp->cmd_conn; 2446 icmdp->cmd_un.scsi.abort_icmdp = new_icmdp; 2447 2448 /* pending queue mutex is already held by timeout_checks */ 2449 iscsi_cmd_state_machine(new_icmdp, ISCSI_CMD_EVENT_E1, isp); 2450 } 2451 2452 /* 2453 * Callback from IDM indicating that the task has been suspended or aborted. 2454 */ 2455 void 2456 iscsi_task_aborted(idm_task_t *idt, idm_status_t status) 2457 { 2458 iscsi_cmd_t *icmdp = idt->idt_private; 2459 iscsi_conn_t *icp = icmdp->cmd_conn; 2460 iscsi_sess_t *isp = icp->conn_sess; 2461 2462 ASSERT(icmdp->cmd_conn != NULL); 2463 2464 switch (status) { 2465 case IDM_STATUS_SUSPENDED: 2466 /* 2467 * If the task is suspended, it may be aborted later, 2468 * so we can ignore this notification. 2469 */ 2470 break; 2471 2472 case IDM_STATUS_ABORTED: 2473 mutex_enter(&icp->conn_queue_active.mutex); 2474 iscsi_cmd_state_machine(icmdp, ISCSI_CMD_EVENT_E9, isp); 2475 mutex_exit(&icp->conn_queue_active.mutex); 2476 break; 2477 2478 default: 2479 /* 2480 * Unexpected status. 2481 */ 2482 ASSERT(0); 2483 } 2484 2485 } 2486 2487 /* 2488 * iscsi_handle_nop - 2489 * 2490 */ 2491 static void 2492 iscsi_handle_nop(iscsi_conn_t *icp, uint32_t itt, uint32_t ttt) 2493 { 2494 iscsi_sess_t *isp = NULL; 2495 iscsi_cmd_t *icmdp = NULL; 2496 2497 ASSERT(icp != NULL); 2498 isp = icp->conn_sess; 2499 ASSERT(isp != NULL); 2500 2501 icmdp = iscsi_cmd_alloc(icp, KM_NOSLEEP); 2502 if (icmdp == NULL) { 2503 return; 2504 } 2505 2506 icmdp->cmd_type = ISCSI_CMD_TYPE_NOP; 2507 icmdp->cmd_itt = itt; 2508 icmdp->cmd_ttt = ttt; 2509 icmdp->cmd_lun = NULL; 2510 icp->conn_nop_lbolt = ddi_get_lbolt(); 2511 2512 iscsi_cmd_state_machine(icmdp, ISCSI_CMD_EVENT_E1, isp); 2513 } 2514 2515 /* 2516 * iscsi_handle_reset - send reset request to the target 2517 * 2518 */ 2519 iscsi_status_t 2520 iscsi_handle_reset(iscsi_sess_t *isp, int level, iscsi_lun_t *ilp) 2521 { 2522 iscsi_status_t rval = ISCSI_STATUS_SUCCESS; 2523 iscsi_conn_t *icp; 2524 iscsi_cmd_t icmd; 2525 2526 ASSERT(isp != NULL); 2527 2528 if (level == RESET_LUN) { 2529 rw_enter(&isp->sess_lun_list_rwlock, RW_WRITER); 2530 ASSERT(ilp != NULL); 2531 if (ilp->lun_state & ISCSI_LUN_STATE_BUSY) { 2532 rw_exit(&isp->sess_lun_list_rwlock); 2533 return (ISCSI_STATUS_SUCCESS); 2534 } 2535 ilp->lun_state |= ISCSI_LUN_STATE_BUSY; 2536 rw_exit(&isp->sess_lun_list_rwlock); 2537 } else { 2538 mutex_enter(&isp->sess_reset_mutex); 2539 if (isp->sess_reset_in_progress == B_TRUE) { 2540 /* 2541 * If the reset is in progress, it is unnecessary 2542 * to send reset to the target redunantly. 2543 */ 2544 mutex_exit(&isp->sess_reset_mutex); 2545 return (ISCSI_STATUS_SUCCESS); 2546 } 2547 isp->sess_reset_in_progress = B_TRUE; 2548 mutex_exit(&isp->sess_reset_mutex); 2549 } 2550 2551 bzero(&icmd, sizeof (iscsi_cmd_t)); 2552 icmd.cmd_sig = ISCSI_SIG_CMD; 2553 icmd.cmd_state = ISCSI_CMD_STATE_FREE; 2554 icmd.cmd_type = ISCSI_CMD_TYPE_RESET; 2555 icmd.cmd_lun = ilp; 2556 icmd.cmd_un.reset.level = level; 2557 icmd.cmd_result = ISCSI_STATUS_SUCCESS; 2558 icmd.cmd_completed = B_FALSE; 2559 icmd.cmd_un.reset.response = SCSI_TCP_TM_RESP_COMPLETE; 2560 2561 mutex_init(&icmd.cmd_mutex, NULL, MUTEX_DRIVER, NULL); 2562 cv_init(&icmd.cmd_completion, NULL, CV_DRIVER, NULL); 2563 /* 2564 * If we received an IO and we are not in the 2565 * LOGGED_IN state we are in the process of 2566 * failing. Just respond that we are BUSY. 2567 */ 2568 mutex_enter(&isp->sess_state_mutex); 2569 if (!ISCSI_SESS_STATE_FULL_FEATURE(isp->sess_state)) { 2570 /* We aren't connected to the target fake success */ 2571 mutex_exit(&isp->sess_state_mutex); 2572 2573 if (level == RESET_LUN) { 2574 rw_enter(&isp->sess_lun_list_rwlock, RW_WRITER); 2575 ilp->lun_state &= ~ISCSI_LUN_STATE_BUSY; 2576 rw_exit(&isp->sess_lun_list_rwlock); 2577 } else { 2578 mutex_enter(&isp->sess_reset_mutex); 2579 isp->sess_reset_in_progress = B_FALSE; 2580 mutex_exit(&isp->sess_reset_mutex); 2581 } 2582 2583 return (ISCSI_STATUS_SUCCESS); 2584 } 2585 2586 mutex_enter(&isp->sess_queue_pending.mutex); 2587 iscsi_cmd_state_machine(&icmd, ISCSI_CMD_EVENT_E1, isp); 2588 mutex_exit(&isp->sess_queue_pending.mutex); 2589 mutex_exit(&isp->sess_state_mutex); 2590 2591 /* stall until completed */ 2592 mutex_enter(&icmd.cmd_mutex); 2593 while (icmd.cmd_completed == B_FALSE) { 2594 cv_wait(&icmd.cmd_completion, &icmd.cmd_mutex); 2595 } 2596 mutex_exit(&icmd.cmd_mutex); 2597 2598 /* copy rval */ 2599 rval = icmd.cmd_result; 2600 2601 if (rval == ISCSI_STATUS_SUCCESS) { 2602 /* 2603 * Reset was successful. We need to flush 2604 * all active IOs. 2605 */ 2606 rw_enter(&isp->sess_conn_list_rwlock, RW_READER); 2607 icp = isp->sess_conn_list; 2608 while (icp != NULL) { 2609 iscsi_cmd_t *t_icmdp = NULL; 2610 iscsi_cmd_t *next_icmdp = NULL; 2611 2612 mutex_enter(&icp->conn_queue_active.mutex); 2613 t_icmdp = icp->conn_queue_active.head; 2614 while (t_icmdp != NULL) { 2615 next_icmdp = t_icmdp->cmd_next; 2616 mutex_enter(&t_icmdp->cmd_mutex); 2617 if (!(t_icmdp->cmd_misc_flags & 2618 ISCSI_CMD_MISCFLAG_SENT)) { 2619 /* 2620 * Although this command is in the 2621 * active queue, it has not been sent. 2622 * Skip it. 2623 */ 2624 mutex_exit(&t_icmdp->cmd_mutex); 2625 t_icmdp = next_icmdp; 2626 continue; 2627 } 2628 if (level == RESET_LUN) { 2629 if (icmd.cmd_lun == NULL || 2630 t_icmdp->cmd_lun == NULL || 2631 (icmd.cmd_lun->lun_num != 2632 t_icmdp->cmd_lun->lun_num)) { 2633 mutex_exit(&t_icmdp->cmd_mutex); 2634 t_icmdp = next_icmdp; 2635 continue; 2636 } 2637 } 2638 2639 if (icmd.cmd_sn == t_icmdp->cmd_sn) { 2640 /* 2641 * This command may be replied with 2642 * UA sense key later. So currently 2643 * it is not a suitable time to flush 2644 * it. Mark its flag with FLUSH. There 2645 * is no harm to keep it for a while. 2646 */ 2647 t_icmdp->cmd_misc_flags |= 2648 ISCSI_CMD_MISCFLAG_FLUSH; 2649 if (t_icmdp->cmd_type == 2650 ISCSI_CMD_TYPE_SCSI) { 2651 t_icmdp->cmd_un.scsi.pkt_stat |= 2652 STAT_BUS_RESET; 2653 } 2654 mutex_exit(&t_icmdp->cmd_mutex); 2655 } else if ((icmd.cmd_sn > t_icmdp->cmd_sn) || 2656 ((t_icmdp->cmd_sn - icmd.cmd_sn) > 2657 ISCSI_CMD_SN_WRAP)) { 2658 /* 2659 * This reset request must act on all 2660 * the commnds from the same session 2661 * having a CmdSN lower than the task 2662 * mangement CmdSN. So flush these 2663 * commands here. 2664 */ 2665 if (t_icmdp->cmd_type == 2666 ISCSI_CMD_TYPE_SCSI) { 2667 t_icmdp->cmd_un.scsi.pkt_stat |= 2668 STAT_BUS_RESET; 2669 } 2670 mutex_exit(&t_icmdp->cmd_mutex); 2671 iscsi_cmd_state_machine(t_icmdp, 2672 ISCSI_CMD_EVENT_E7, isp); 2673 } else { 2674 mutex_exit(&t_icmdp->cmd_mutex); 2675 } 2676 2677 t_icmdp = next_icmdp; 2678 } 2679 2680 mutex_exit(&icp->conn_queue_active.mutex); 2681 icp = icp->conn_next; 2682 } 2683 rw_exit(&isp->sess_conn_list_rwlock); 2684 } 2685 2686 /* clean up */ 2687 cv_destroy(&icmd.cmd_completion); 2688 mutex_destroy(&icmd.cmd_mutex); 2689 2690 if (level == RESET_LUN) { 2691 rw_enter(&isp->sess_lun_list_rwlock, RW_WRITER); 2692 ilp->lun_state &= ~ISCSI_LUN_STATE_BUSY; 2693 rw_exit(&isp->sess_lun_list_rwlock); 2694 } else { 2695 mutex_enter(&isp->sess_reset_mutex); 2696 isp->sess_reset_in_progress = B_FALSE; 2697 mutex_exit(&isp->sess_reset_mutex); 2698 } 2699 2700 return (rval); 2701 } 2702 2703 /* 2704 * iscsi_logout_start - task handler for deferred logout 2705 * Acquire a hold before call, released in iscsi_handle_logout 2706 */ 2707 static void 2708 iscsi_logout_start(void *arg) 2709 { 2710 iscsi_task_t *itp = (iscsi_task_t *)arg; 2711 iscsi_conn_t *icp; 2712 2713 icp = (iscsi_conn_t *)itp->t_arg; 2714 2715 mutex_enter(&icp->conn_state_mutex); 2716 (void) iscsi_handle_logout(icp); 2717 mutex_exit(&icp->conn_state_mutex); 2718 } 2719 2720 /* 2721 * iscsi_handle_logout - This function will issue a logout for 2722 * the session from a specific connection. 2723 * Acquire idm_conn_hold before call. Released internally. 2724 */ 2725 iscsi_status_t 2726 iscsi_handle_logout(iscsi_conn_t *icp) 2727 { 2728 iscsi_sess_t *isp; 2729 idm_conn_t *ic; 2730 iscsi_cmd_t *icmdp; 2731 int rval; 2732 2733 ASSERT(icp != NULL); 2734 isp = icp->conn_sess; 2735 ic = icp->conn_ic; 2736 ASSERT(isp != NULL); 2737 ASSERT(isp->sess_hba != NULL); 2738 ASSERT(mutex_owned(&icp->conn_state_mutex)); 2739 2740 /* 2741 * If the connection has already gone down (e.g. if the transport 2742 * failed between when this LOGOUT was generated and now) then we 2743 * can and must skip sending the LOGOUT. Check the same condition 2744 * we use below to determine that connection has "settled". 2745 */ 2746 if ((icp->conn_state == ISCSI_CONN_STATE_FREE) || 2747 (icp->conn_state == ISCSI_CONN_STATE_FAILED) || 2748 (icp->conn_state == ISCSI_CONN_STATE_POLLING)) { 2749 idm_conn_rele(ic); 2750 return (0); 2751 } 2752 2753 icmdp = iscsi_cmd_alloc(icp, KM_SLEEP); 2754 ASSERT(icmdp != NULL); 2755 icmdp->cmd_type = ISCSI_CMD_TYPE_LOGOUT; 2756 icmdp->cmd_result = ISCSI_STATUS_SUCCESS; 2757 icmdp->cmd_completed = B_FALSE; 2758 2759 mutex_enter(&isp->sess_queue_pending.mutex); 2760 iscsi_cmd_state_machine(icmdp, ISCSI_CMD_EVENT_E1, isp); 2761 mutex_exit(&isp->sess_queue_pending.mutex); 2762 2763 /* 2764 * release connection state mutex to avoid a deadlock. This 2765 * function is called from within the connection state 2766 * machine with the lock held. When the logout response is 2767 * received another call to the connection state machine 2768 * occurs which causes the deadlock 2769 */ 2770 mutex_exit(&icp->conn_state_mutex); 2771 2772 /* stall until completed */ 2773 mutex_enter(&icmdp->cmd_mutex); 2774 while (icmdp->cmd_completed == B_FALSE) { 2775 cv_wait(&icmdp->cmd_completion, &icmdp->cmd_mutex); 2776 } 2777 mutex_exit(&icmdp->cmd_mutex); 2778 mutex_enter(&icp->conn_state_mutex); 2779 2780 /* copy rval */ 2781 rval = icmdp->cmd_result; 2782 2783 /* clean up */ 2784 iscsi_cmd_free(icmdp); 2785 2786 if (rval != 0) { 2787 /* If the logout failed then drop the connection */ 2788 idm_ini_conn_disconnect(icp->conn_ic); 2789 } 2790 2791 /* stall until connection settles */ 2792 while ((icp->conn_state != ISCSI_CONN_STATE_FREE) && 2793 (icp->conn_state != ISCSI_CONN_STATE_FAILED) && 2794 (icp->conn_state != ISCSI_CONN_STATE_POLLING)) { 2795 /* wait for transition */ 2796 cv_wait(&icp->conn_state_change, &icp->conn_state_mutex); 2797 } 2798 2799 idm_conn_rele(ic); 2800 2801 /* 2802 * Return value reflects whether the logout command completed -- 2803 * regardless of the return value the connection is closed and 2804 * ready for reconnection. 2805 */ 2806 return (rval); 2807 } 2808 2809 2810 /* 2811 * iscsi_handle_text - main control function for iSCSI text requests. This 2812 * function handles allocating the command, sending initial text request, and 2813 * handling long response sequence. 2814 * If a data overflow condition occurs, iscsi_handle_text continues to 2815 * receive responses until the all data has been recieved. This allows 2816 * the full data length to be returned to the caller. 2817 */ 2818 iscsi_status_t 2819 iscsi_handle_text(iscsi_conn_t *icp, char *buf, uint32_t buf_len, 2820 uint32_t data_len, uint32_t *rx_data_len) 2821 { 2822 iscsi_sess_t *isp; 2823 iscsi_cmd_t *icmdp; 2824 iscsi_status_t rval = ISCSI_STATUS_SUCCESS; 2825 2826 ASSERT(icp != NULL); 2827 ASSERT(buf != NULL); 2828 ASSERT(rx_data_len != NULL); 2829 2830 isp = icp->conn_sess; 2831 ASSERT(isp != NULL); 2832 2833 /* 2834 * Ensure data for text request command is not greater 2835 * than the negotiated maximum receive data seqment length. 2836 * 2837 * Although iSCSI allows for long text requests (multiple 2838 * pdus), this function places a restriction on text 2839 * requests to ensure it is handled by a single PDU. 2840 */ 2841 if (data_len > icp->conn_params.max_xmit_data_seg_len) { 2842 return (ISCSI_STATUS_CMD_FAILED); 2843 } 2844 2845 icmdp = iscsi_cmd_alloc(icp, KM_SLEEP); 2846 ASSERT(icmdp != NULL); 2847 2848 icmdp->cmd_type = ISCSI_CMD_TYPE_TEXT; 2849 icmdp->cmd_result = ISCSI_STATUS_SUCCESS; 2850 icmdp->cmd_misc_flags &= ~ISCSI_CMD_MISCFLAG_FREE; 2851 icmdp->cmd_completed = B_FALSE; 2852 2853 icmdp->cmd_un.text.buf = buf; 2854 icmdp->cmd_un.text.buf_len = buf_len; 2855 icmdp->cmd_un.text.offset = 0; 2856 icmdp->cmd_un.text.data_len = data_len; 2857 icmdp->cmd_un.text.total_rx_len = 0; 2858 icmdp->cmd_un.text.ttt = ISCSI_RSVD_TASK_TAG; 2859 icmdp->cmd_un.text.stage = ISCSI_CMD_TEXT_INITIAL_REQ; 2860 2861 long_text_response: 2862 mutex_enter(&isp->sess_state_mutex); 2863 if (!ISCSI_SESS_STATE_FULL_FEATURE(isp->sess_state)) { 2864 iscsi_cmd_free(icmdp); 2865 mutex_exit(&isp->sess_state_mutex); 2866 return (ISCSI_STATUS_NO_CONN_LOGGED_IN); 2867 } 2868 2869 mutex_enter(&isp->sess_queue_pending.mutex); 2870 iscsi_cmd_state_machine(icmdp, ISCSI_CMD_EVENT_E1, isp); 2871 mutex_exit(&isp->sess_queue_pending.mutex); 2872 mutex_exit(&isp->sess_state_mutex); 2873 2874 /* stall until completed */ 2875 mutex_enter(&icmdp->cmd_mutex); 2876 while (icmdp->cmd_completed == B_FALSE) { 2877 cv_wait(&icmdp->cmd_completion, &icmdp->cmd_mutex); 2878 } 2879 mutex_exit(&icmdp->cmd_mutex); 2880 2881 /* 2882 * check if error occured. If data overflow occured, continue on 2883 * to ensure we get all data so that the full data length can be 2884 * returned to the user 2885 */ 2886 if ((icmdp->cmd_result != ISCSI_STATUS_SUCCESS) && 2887 (icmdp->cmd_result != ISCSI_STATUS_DATA_OVERFLOW)) { 2888 cmn_err(CE_NOTE, "iscsi: SendTarget discovery failed (%d)", 2889 icmdp->cmd_result); 2890 rval = icmdp->cmd_result; 2891 iscsi_cmd_free(icmdp); 2892 return (rval); 2893 } 2894 2895 /* check if this was a partial text PDU */ 2896 if (icmdp->cmd_un.text.stage != ISCSI_CMD_TEXT_FINAL_RSP) { 2897 /* 2898 * If a paritial text rexponse received, send an empty 2899 * text request. This follows the behaviour specified 2900 * in RFC3720 regarding long text responses. 2901 */ 2902 icmdp->cmd_misc_flags &= ~ISCSI_CMD_MISCFLAG_FREE; 2903 icmdp->cmd_completed = B_FALSE; 2904 icmdp->cmd_un.text.data_len = 0; 2905 icmdp->cmd_un.text.stage = ISCSI_CMD_TEXT_CONTINUATION; 2906 goto long_text_response; 2907 } 2908 2909 /* 2910 * set total received data length. If data overflow this would be 2911 * amount of data that would have been received if buffer large 2912 * enough. 2913 */ 2914 *rx_data_len = icmdp->cmd_un.text.total_rx_len; 2915 2916 /* copy rval */ 2917 rval = icmdp->cmd_result; 2918 2919 /* clean up */ 2920 iscsi_cmd_free(icmdp); 2921 2922 return (rval); 2923 } 2924 2925 /* 2926 * iscsi_handle_passthru - This function is used to send a uscsi_cmd 2927 * to a specific target lun. This routine is used for internal purposes 2928 * during enumeration and via the ISCSI_USCSICMD IOCTL. We restrict 2929 * the CDBs that can be issued to a target/lun to INQUIRY, REPORT_LUNS, 2930 * and READ_CAPACITY for security purposes. 2931 * 2932 * The logic here is broken into three phases. 2933 * 1) Allocate and initialize a pkt/icmdp 2934 * 2) Send the pkt/icmdp 2935 * 3) cv_wait for completion 2936 */ 2937 iscsi_status_t 2938 iscsi_handle_passthru(iscsi_sess_t *isp, uint16_t lun, struct uscsi_cmd *ucmdp) 2939 { 2940 iscsi_status_t rval; 2941 iscsi_cmd_t *icmdp; 2942 struct scsi_pkt *pkt; 2943 struct buf *bp; 2944 struct scsi_arq_status *arqstat; 2945 int statuslen; 2946 2947 ASSERT(isp != NULL); 2948 ASSERT(ucmdp != NULL); 2949 2950 if (ucmdp->uscsi_rqlen > SENSE_LENGTH) { 2951 /* 2952 * The caller provided sense buffer large enough for additional 2953 * sense bytes. We need to allocate pkt_scbp to fit them there 2954 * too. 2955 */ 2956 statuslen = ucmdp->uscsi_rqlen + ISCSI_ARQ_STATUS_NOSENSE_LEN; 2957 } else { 2958 /* The default size of pkt_scbp */ 2959 statuslen = sizeof (struct scsi_arq_status); 2960 } 2961 2962 /* 2963 * Step 1. Setup structs - KM_SLEEP will always succeed 2964 */ 2965 bp = kmem_zalloc(sizeof (struct buf), KM_SLEEP); 2966 ASSERT(bp != NULL); 2967 pkt = kmem_zalloc(sizeof (struct scsi_pkt), KM_SLEEP); 2968 ASSERT(pkt != NULL); 2969 icmdp = iscsi_cmd_alloc(NULL, KM_SLEEP); 2970 ASSERT(icmdp != NULL); 2971 2972 /* setup bp structure */ 2973 bp->b_flags = B_READ; 2974 bp->b_bcount = ucmdp->uscsi_buflen; 2975 bp->b_un.b_addr = ucmdp->uscsi_bufaddr; 2976 2977 /* setup scsi_pkt structure */ 2978 pkt->pkt_ha_private = icmdp; 2979 pkt->pkt_scbp = kmem_zalloc(statuslen, KM_SLEEP); 2980 pkt->pkt_cdbp = kmem_zalloc(ucmdp->uscsi_cdblen, KM_SLEEP); 2981 /* callback routine for passthru, will wake cv_wait */ 2982 pkt->pkt_comp = iscsi_handle_passthru_callback; 2983 pkt->pkt_time = ucmdp->uscsi_timeout; 2984 2985 /* setup iscsi_cmd structure */ 2986 icmdp->cmd_lun = NULL; 2987 icmdp->cmd_type = ISCSI_CMD_TYPE_SCSI; 2988 icmdp->cmd_un.scsi.lun = lun; 2989 icmdp->cmd_un.scsi.pkt = pkt; 2990 icmdp->cmd_un.scsi.bp = bp; 2991 bcopy(ucmdp->uscsi_cdb, pkt->pkt_cdbp, ucmdp->uscsi_cdblen); 2992 icmdp->cmd_un.scsi.cmdlen = ucmdp->uscsi_cdblen; 2993 icmdp->cmd_un.scsi.statuslen = statuslen; 2994 icmdp->cmd_crc_error_seen = B_FALSE; 2995 icmdp->cmd_completed = B_FALSE; 2996 icmdp->cmd_result = ISCSI_STATUS_SUCCESS; 2997 2998 /* 2999 * Step 2. Push IO onto pending queue. If we aren't in 3000 * FULL_FEATURE we need to fail the IO. 3001 */ 3002 mutex_enter(&isp->sess_state_mutex); 3003 if (!ISCSI_SESS_STATE_FULL_FEATURE(isp->sess_state)) { 3004 mutex_exit(&isp->sess_state_mutex); 3005 3006 iscsi_cmd_free(icmdp); 3007 kmem_free(pkt->pkt_cdbp, ucmdp->uscsi_cdblen); 3008 kmem_free(pkt->pkt_scbp, statuslen); 3009 kmem_free(pkt, sizeof (struct scsi_pkt)); 3010 kmem_free(bp, sizeof (struct buf)); 3011 3012 return (ISCSI_STATUS_CMD_FAILED); 3013 } 3014 3015 mutex_enter(&isp->sess_queue_pending.mutex); 3016 iscsi_cmd_state_machine(icmdp, ISCSI_CMD_EVENT_E1, isp); 3017 mutex_exit(&isp->sess_queue_pending.mutex); 3018 mutex_exit(&isp->sess_state_mutex); 3019 3020 /* 3021 * Step 3. Wait on cv_wait for completion routine 3022 */ 3023 mutex_enter(&icmdp->cmd_mutex); 3024 while (icmdp->cmd_completed == B_FALSE) { 3025 cv_wait(&icmdp->cmd_completion, &icmdp->cmd_mutex); 3026 } 3027 mutex_exit(&icmdp->cmd_mutex); 3028 3029 /* copy rval */ 3030 rval = icmdp->cmd_result; 3031 3032 ucmdp->uscsi_resid = pkt->pkt_resid; 3033 3034 /* update scsi status */ 3035 arqstat = (struct scsi_arq_status *)pkt->pkt_scbp; 3036 ucmdp->uscsi_status = ((char *)&arqstat->sts_status)[0]; 3037 3038 /* copy request sense buffers if caller gave space */ 3039 if ((ucmdp->uscsi_rqlen > 0) && 3040 (ucmdp->uscsi_rqbuf != NULL)) { 3041 ASSERT(ucmdp->uscsi_rqlen >= arqstat->sts_rqpkt_resid); 3042 ucmdp->uscsi_rqresid = arqstat->sts_rqpkt_resid; 3043 bcopy(&arqstat->sts_sensedata, ucmdp->uscsi_rqbuf, 3044 ucmdp->uscsi_rqlen - arqstat->sts_rqpkt_resid); 3045 } 3046 3047 /* clean up */ 3048 iscsi_cmd_free(icmdp); 3049 kmem_free(pkt->pkt_cdbp, ucmdp->uscsi_cdblen); 3050 kmem_free(pkt->pkt_scbp, statuslen); 3051 kmem_free(pkt, sizeof (struct scsi_pkt)); 3052 kmem_free(bp, sizeof (struct buf)); 3053 3054 return (rval); 3055 } 3056 3057 3058 /* 3059 * iscsi_handle_passthru_callback - 3060 * 3061 */ 3062 static void 3063 iscsi_handle_passthru_callback(struct scsi_pkt *pkt) 3064 { 3065 iscsi_cmd_t *icmdp = NULL; 3066 3067 ASSERT(pkt != NULL); 3068 icmdp = (iscsi_cmd_t *)pkt->pkt_ha_private; 3069 ASSERT(icmdp != NULL); 3070 3071 mutex_enter(&icmdp->cmd_mutex); 3072 icmdp->cmd_completed = B_TRUE; 3073 icmdp->cmd_result = ISCSI_STATUS_SUCCESS; 3074 cv_broadcast(&icmdp->cmd_completion); 3075 mutex_exit(&icmdp->cmd_mutex); 3076 3077 } 3078 3079 /* 3080 * IDM callbacks 3081 */ 3082 void 3083 iscsi_build_hdr(idm_task_t *idm_task, idm_pdu_t *pdu, uint8_t opcode) 3084 { 3085 iscsi_cmd_t *icmdp = idm_task->idt_private; 3086 iscsi_conn_t *icp = icmdp->cmd_conn; 3087 iscsi_data_hdr_t *ihp = (iscsi_data_hdr_t *)pdu->isp_hdr; 3088 3089 mutex_enter(&icmdp->cmd_mutex); 3090 if (opcode == ISCSI_OP_SCSI_DATA) { 3091 uint32_t data_sn; 3092 uint32_t lun; 3093 icmdp = idm_task->idt_private; 3094 icp = icmdp->cmd_conn; 3095 ihp->opcode = opcode; 3096 ihp->itt = icmdp->cmd_itt; 3097 ihp->ttt = idm_task->idt_r2t_ttt; 3098 ihp->expstatsn = htonl(icp->conn_expstatsn); 3099 icp->conn_laststatsn = icp->conn_expstatsn; 3100 data_sn = ntohl(ihp->datasn); 3101 data_sn++; 3102 lun = icmdp->cmd_un.scsi.lun; 3103 ISCSI_LUN_BYTE_COPY(ihp->lun, lun); 3104 /* CRM: upate_flow_control */ 3105 ISCSI_IO_LOG(CE_NOTE, "DEBUG: iscsi_build_hdr" 3106 "(ISCSI_OP_SCSI_DATA): task: %p icp: %p ic: %p itt: %x " 3107 "exp: %d data_sn: %d", (void *)idm_task, (void *)icp, 3108 (void *)icp->conn_ic, ihp->itt, icp->conn_expstatsn, 3109 data_sn); 3110 } else { 3111 cmn_err(CE_WARN, "iscsi_build_hdr: unprocessed build " 3112 "header opcode: %x", opcode); 3113 } 3114 mutex_exit(&icmdp->cmd_mutex); 3115 } 3116 3117 static void 3118 iscsi_process_rsp_status(iscsi_sess_t *isp, iscsi_conn_t *icp, 3119 idm_status_t status) 3120 { 3121 switch (status) { 3122 case IDM_STATUS_SUCCESS: 3123 if ((isp->sess_state == ISCSI_SESS_STATE_IN_FLUSH) && 3124 (icp->conn_queue_active.count == 0)) { 3125 iscsi_drop_conn_cleanup(icp); 3126 } 3127 break; 3128 case IDM_STATUS_PROTOCOL_ERROR: 3129 KSTAT_INC_CONN_ERR_PROTOCOL(icp); 3130 iscsi_drop_conn_cleanup(icp); 3131 break; 3132 default: 3133 break; 3134 } 3135 } 3136 3137 static void 3138 iscsi_drop_conn_cleanup(iscsi_conn_t *icp) { 3139 mutex_enter(&icp->conn_state_mutex); 3140 idm_ini_conn_disconnect(icp->conn_ic); 3141 mutex_exit(&icp->conn_state_mutex); 3142 } 3143 3144 void 3145 iscsi_rx_error_pdu(idm_conn_t *ic, idm_pdu_t *pdu, idm_status_t status) 3146 { 3147 iscsi_conn_t *icp = (iscsi_conn_t *)ic->ic_handle; 3148 iscsi_sess_t *isp; 3149 3150 ASSERT(icp != NULL); 3151 isp = icp->conn_sess; 3152 ASSERT(isp != NULL); 3153 iscsi_process_rsp_status(isp, icp, status); 3154 idm_pdu_complete(pdu, status); 3155 } 3156 3157 void 3158 iscsi_rx_misc_pdu(idm_conn_t *ic, idm_pdu_t *pdu) 3159 { 3160 iscsi_conn_t *icp; 3161 iscsi_hdr_t *ihp = (iscsi_hdr_t *)pdu->isp_hdr; 3162 iscsi_sess_t *isp; 3163 idm_status_t status; 3164 3165 icp = ic->ic_handle; 3166 isp = icp->conn_sess; 3167 isp->sess_rx_lbolt = icp->conn_rx_lbolt = ddi_get_lbolt(); 3168 switch (ihp->opcode & ISCSI_OPCODE_MASK) { 3169 case ISCSI_OP_LOGIN_RSP: 3170 status = iscsi_rx_process_login_pdu(ic, pdu); 3171 idm_pdu_complete(pdu, status); 3172 break; 3173 case ISCSI_OP_LOGOUT_RSP: 3174 status = iscsi_rx_process_logout_rsp(ic, pdu); 3175 idm_pdu_complete(pdu, status); 3176 break; 3177 case ISCSI_OP_REJECT_MSG: 3178 status = iscsi_rx_process_reject_rsp(ic, pdu); 3179 break; 3180 case ISCSI_OP_SCSI_TASK_MGT_RSP: 3181 status = iscsi_rx_process_task_mgt_rsp(ic, pdu); 3182 idm_pdu_complete(pdu, status); 3183 break; 3184 case ISCSI_OP_NOOP_IN: 3185 status = iscsi_rx_process_nop(ic, pdu); 3186 idm_pdu_complete(pdu, status); 3187 break; 3188 case ISCSI_OP_ASYNC_EVENT: 3189 status = iscsi_rx_process_async_rsp(ic, pdu); 3190 break; 3191 case ISCSI_OP_TEXT_RSP: 3192 status = iscsi_rx_process_text_rsp(ic, pdu); 3193 idm_pdu_complete(pdu, status); 3194 break; 3195 default: 3196 cmn_err(CE_WARN, "iscsi connection(%u) protocol error " 3197 "- received misc unsupported opcode 0x%02x", 3198 icp->conn_oid, ihp->opcode); 3199 status = IDM_STATUS_PROTOCOL_ERROR; 3200 break; 3201 } 3202 iscsi_process_rsp_status(isp, icp, status); 3203 } 3204 3205 /* 3206 * +--------------------------------------------------------------------+ 3207 * | Beginning of completion routines | 3208 * +--------------------------------------------------------------------+ 3209 */ 3210 3211 /* 3212 * iscsi_ic_thread - 3213 */ 3214 void 3215 iscsi_ic_thread(iscsi_thread_t *thread, void *arg) 3216 { 3217 iscsi_sess_t *isp = (iscsi_sess_t *)arg; 3218 int ret; 3219 iscsi_queue_t q; 3220 iscsi_cmd_t *icmdp; 3221 iscsi_cmd_t *next_icmdp; 3222 3223 ASSERT(isp != NULL); 3224 ASSERT(thread != NULL); 3225 ASSERT(thread->signature == SIG_ISCSI_THREAD); 3226 3227 for (;;) { 3228 3229 /* 3230 * We wait till iodone or somebody else wakes us up. 3231 */ 3232 ret = iscsi_thread_wait(thread, -1); 3233 3234 /* 3235 * The value should never be negative since we never timeout. 3236 */ 3237 ASSERT(ret >= 0); 3238 3239 q.count = 0; 3240 q.head = NULL; 3241 q.tail = NULL; 3242 mutex_enter(&isp->sess_queue_completion.mutex); 3243 icmdp = isp->sess_queue_completion.head; 3244 while (icmdp != NULL) { 3245 next_icmdp = icmdp->cmd_next; 3246 mutex_enter(&icmdp->cmd_mutex); 3247 /* 3248 * check if the associated r2t/abort has finished 3249 * yet. If not, don't complete the command. 3250 */ 3251 if ((icmdp->cmd_un.scsi.r2t_icmdp == NULL) && 3252 (icmdp->cmd_un.scsi.abort_icmdp == NULL)) { 3253 mutex_exit(&icmdp->cmd_mutex); 3254 (void) iscsi_dequeue_cmd(&isp-> 3255 sess_queue_completion.head, 3256 &isp->sess_queue_completion.tail, 3257 icmdp); 3258 --isp->sess_queue_completion.count; 3259 iscsi_enqueue_cmd_head(&q.head, 3260 &q.tail, icmdp); 3261 } else { 3262 mutex_exit(&icmdp->cmd_mutex); 3263 } 3264 icmdp = next_icmdp; 3265 } 3266 mutex_exit(&isp->sess_queue_completion.mutex); 3267 icmdp = q.head; 3268 while (icmdp != NULL) { 3269 next_icmdp = icmdp->cmd_next; 3270 iscsi_cmd_state_machine(icmdp, ISCSI_CMD_EVENT_E8, isp); 3271 icmdp = next_icmdp; 3272 } 3273 3274 if (ret > 0) 3275 /* Somebody woke us up to work */ 3276 continue; 3277 else 3278 /* 3279 * Somebody woke us up to kill ourselves. We will 3280 * make sure, however that the completion queue is 3281 * empty before leaving. After we've done that it 3282 * is the originator of the signal that has to make 3283 * sure no other SCSI command is posted. 3284 */ 3285 break; 3286 } 3287 3288 } 3289 3290 /* 3291 * iscsi_iodone - 3292 * 3293 */ 3294 void 3295 iscsi_iodone(iscsi_sess_t *isp, iscsi_cmd_t *icmdp) 3296 { 3297 struct scsi_pkt *pkt = NULL; 3298 struct buf *bp = icmdp->cmd_un.scsi.bp; 3299 3300 ASSERT(isp != NULL); 3301 ASSERT(icmdp != NULL); 3302 pkt = icmdp->cmd_un.scsi.pkt; 3303 ASSERT(pkt != NULL); 3304 3305 ASSERT(icmdp->cmd_un.scsi.abort_icmdp == NULL); 3306 ASSERT(icmdp->cmd_un.scsi.r2t_icmdp == NULL); 3307 if (pkt->pkt_reason == CMD_CMPLT) { 3308 if (bp) { 3309 if (bp->b_flags & B_READ) { 3310 KSTAT_SESS_RX_IO_DONE(isp, bp->b_bcount); 3311 } else { 3312 KSTAT_SESS_TX_IO_DONE(isp, bp->b_bcount); 3313 } 3314 } 3315 } 3316 3317 if (pkt->pkt_flags & FLAG_NOINTR) { 3318 cv_broadcast(&icmdp->cmd_completion); 3319 mutex_exit(&icmdp->cmd_mutex); 3320 } else { 3321 /* 3322 * Release mutex. As soon as callback is 3323 * issued the caller may destroy the command. 3324 */ 3325 mutex_exit(&icmdp->cmd_mutex); 3326 /* 3327 * We can't just directly call the pk_comp routine. In 3328 * many error cases the target driver will use the calling 3329 * thread to re-drive error handling (reset, retries...) 3330 * back into the hba driver (iscsi). If the target redrives 3331 * a reset back into the iscsi driver off this thead we have 3332 * a chance of deadlocking. So instead use the io completion 3333 * thread. 3334 */ 3335 (*icmdp->cmd_un.scsi.pkt->pkt_comp)(icmdp->cmd_un.scsi.pkt); 3336 } 3337 } 3338 3339 /* 3340 * +--------------------------------------------------------------------+ 3341 * | End of completion routines | 3342 * +--------------------------------------------------------------------+ 3343 */ 3344 3345 /* 3346 * +--------------------------------------------------------------------+ 3347 * | Beginning of watchdog routines | 3348 * +--------------------------------------------------------------------+ 3349 */ 3350 3351 /* 3352 * iscsi_watchdog_thread - 3353 * 3354 */ 3355 void 3356 iscsi_wd_thread(iscsi_thread_t *thread, void *arg) 3357 { 3358 iscsi_sess_t *isp = (iscsi_sess_t *)arg; 3359 int rc = 1; 3360 3361 ASSERT(isp != NULL); 3362 3363 while (rc != NULL) { 3364 3365 iscsi_timeout_checks(isp); 3366 iscsi_nop_checks(isp); 3367 3368 rc = iscsi_thread_wait(thread, SEC_TO_TICK(1)); 3369 } 3370 } 3371 3372 /* 3373 * iscsi_timeout_checks - 3374 * 3375 */ 3376 static void 3377 iscsi_timeout_checks(iscsi_sess_t *isp) 3378 { 3379 clock_t now = ddi_get_lbolt(); 3380 iscsi_conn_t *icp; 3381 iscsi_cmd_t *icmdp, *nicmdp; 3382 3383 ASSERT(isp != NULL); 3384 3385 /* PENDING */ 3386 mutex_enter(&isp->sess_state_mutex); 3387 mutex_enter(&isp->sess_queue_pending.mutex); 3388 for (icmdp = isp->sess_queue_pending.head; 3389 icmdp; icmdp = nicmdp) { 3390 nicmdp = icmdp->cmd_next; 3391 3392 /* Skip entries with no timeout */ 3393 if (icmdp->cmd_lbolt_timeout == 0) 3394 continue; 3395 3396 /* 3397 * Skip pending queue entries for cmd_type values that depend 3398 * on having an open cmdsn window for successfull transition 3399 * from pending to the active (i.e. ones that depend on 3400 * sess_cmdsn .vs. sess_maxcmdsn). For them, the timer starts 3401 * when they are successfully moved to the active queue by 3402 * iscsi_cmd_state_pending() code. 3403 */ 3404 /* 3405 * If the cmd is stuck, at least give it a chance 3406 * to timeout 3407 */ 3408 if (((icmdp->cmd_type == ISCSI_CMD_TYPE_SCSI) || 3409 (icmdp->cmd_type == ISCSI_CMD_TYPE_TEXT)) && 3410 !(icmdp->cmd_misc_flags & ISCSI_CMD_MISCFLAG_STUCK)) 3411 continue; 3412 3413 /* Skip if timeout still in the future */ 3414 if (now <= icmdp->cmd_lbolt_timeout) 3415 continue; 3416 3417 /* timeout */ 3418 iscsi_cmd_state_machine(icmdp, ISCSI_CMD_EVENT_E6, isp); 3419 } 3420 mutex_exit(&isp->sess_queue_pending.mutex); 3421 mutex_exit(&isp->sess_state_mutex); 3422 3423 rw_enter(&isp->sess_conn_list_rwlock, RW_READER); 3424 icp = isp->sess_conn_list; 3425 while (icp != NULL) { 3426 3427 icp->conn_timeout = B_FALSE; 3428 /* ACTIVE */ 3429 mutex_enter(&icp->conn_state_mutex); 3430 mutex_enter(&isp->sess_queue_pending.mutex); 3431 mutex_enter(&icp->conn_queue_active.mutex); 3432 for (icmdp = icp->conn_queue_active.head; 3433 icmdp; icmdp = nicmdp) { 3434 nicmdp = icmdp->cmd_next; 3435 3436 if (iscsi_nop_timeout_checks(icmdp) == B_TRUE) { 3437 icp->conn_timeout = B_TRUE; 3438 } 3439 3440 /* Skip entries with no timeout */ 3441 if (icmdp->cmd_lbolt_timeout == 0) 3442 continue; 3443 3444 /* 3445 * Skip if command is not active or not needed 3446 * to flush. 3447 */ 3448 if (icmdp->cmd_state != ISCSI_CMD_STATE_ACTIVE && 3449 !(icmdp->cmd_misc_flags & ISCSI_CMD_MISCFLAG_FLUSH)) 3450 continue; 3451 3452 /* Skip if timeout still in the future */ 3453 if (now <= icmdp->cmd_lbolt_timeout) 3454 continue; 3455 3456 if (icmdp->cmd_misc_flags & ISCSI_CMD_MISCFLAG_FLUSH) { 3457 /* 3458 * This command is left during target reset, 3459 * we can flush it now. 3460 */ 3461 iscsi_cmd_state_machine(icmdp, 3462 ISCSI_CMD_EVENT_E7, isp); 3463 } else if (icmdp->cmd_state == ISCSI_CMD_STATE_ACTIVE) { 3464 /* timeout */ 3465 iscsi_cmd_state_machine(icmdp, 3466 ISCSI_CMD_EVENT_E6, isp); 3467 } 3468 3469 } 3470 mutex_exit(&icp->conn_queue_active.mutex); 3471 mutex_exit(&isp->sess_queue_pending.mutex); 3472 mutex_exit(&icp->conn_state_mutex); 3473 3474 icp = icp->conn_next; 3475 } 3476 3477 icp = isp->sess_conn_list; 3478 while (icp != NULL) { 3479 if (icp->conn_timeout == B_TRUE) { 3480 /* timeout on this connect detected */ 3481 idm_ini_conn_disconnect(icp->conn_ic); 3482 icp->conn_timeout = B_FALSE; 3483 } 3484 icp = icp->conn_next; 3485 } 3486 rw_exit(&isp->sess_conn_list_rwlock); 3487 } 3488 3489 /* 3490 * iscsi_nop_checks - sends a NOP on idle connections 3491 * 3492 * This function walks the connections on a session and 3493 * issues NOPs on those connections that are in FULL 3494 * FEATURE mode and have not received data for the 3495 * time period specified by iscsi_nop_delay (global). 3496 */ 3497 static void 3498 iscsi_nop_checks(iscsi_sess_t *isp) 3499 { 3500 iscsi_conn_t *icp; 3501 3502 ASSERT(isp != NULL); 3503 3504 if (isp->sess_type == ISCSI_SESS_TYPE_DISCOVERY) { 3505 return; 3506 } 3507 3508 rw_enter(&isp->sess_conn_list_rwlock, RW_READER); 3509 icp = isp->sess_conn_act; 3510 if (icp != NULL) { 3511 3512 mutex_enter(&icp->conn_state_mutex); 3513 if ((ISCSI_CONN_STATE_FULL_FEATURE(icp->conn_state)) && 3514 (ddi_get_lbolt() > isp->sess_conn_act->conn_rx_lbolt + 3515 SEC_TO_TICK(iscsi_nop_delay)) && (ddi_get_lbolt() > 3516 isp->sess_conn_act->conn_nop_lbolt + 3517 SEC_TO_TICK(iscsi_nop_delay))) { 3518 3519 /* 3520 * We haven't received anything from the 3521 * target is a defined period of time, 3522 * send NOP to see if the target is alive. 3523 */ 3524 mutex_enter(&isp->sess_queue_pending.mutex); 3525 iscsi_handle_nop(isp->sess_conn_act, 3526 0, ISCSI_RSVD_TASK_TAG); 3527 mutex_exit(&isp->sess_queue_pending.mutex); 3528 } 3529 mutex_exit(&icp->conn_state_mutex); 3530 3531 icp = icp->conn_next; 3532 } 3533 rw_exit(&isp->sess_conn_list_rwlock); 3534 } 3535 3536 static boolean_t 3537 iscsi_nop_timeout_checks(iscsi_cmd_t *icmdp) 3538 { 3539 if (icmdp->cmd_type == ISCSI_CMD_TYPE_NOP) { 3540 if ((ddi_get_lbolt() - icmdp->cmd_lbolt_active) > 3541 SEC_TO_TICK(ISCSI_CONN_TIEMOUT_DETECT)) { 3542 return (B_TRUE); 3543 } else { 3544 return (B_FALSE); 3545 } 3546 } 3547 return (B_FALSE); 3548 } 3549 /* 3550 * +--------------------------------------------------------------------+ 3551 * | End of wd routines | 3552 * +--------------------------------------------------------------------+ 3553 */ 3554 3555 /* 3556 * iscsi_flush_cmd_after_reset - flush commands after reset 3557 * 3558 * Here we will flush all the commands for a specified LUN whose cmdsn is less 3559 * than the one received with the Unit Attention. 3560 */ 3561 static void 3562 iscsi_flush_cmd_after_reset(uint32_t cmd_sn, uint16_t lun_num, 3563 iscsi_conn_t *icp) 3564 { 3565 iscsi_cmd_t *t_icmdp = NULL; 3566 iscsi_cmd_t *next_icmdp = NULL; 3567 3568 ASSERT(icp != NULL); 3569 3570 t_icmdp = icp->conn_queue_active.head; 3571 while (t_icmdp != NULL) { 3572 next_icmdp = t_icmdp->cmd_next; 3573 mutex_enter(&t_icmdp->cmd_mutex); 3574 /* 3575 * We will flush the commands whose cmdsn is less than the one 3576 * got Unit Attention. 3577 * Here we will check for wrap by subtracting and compare to 3578 * 1/2 of a 32 bit number, if greater then we wrapped. 3579 */ 3580 if ((t_icmdp->cmd_misc_flags & ISCSI_CMD_MISCFLAG_SENT) && 3581 ((cmd_sn > t_icmdp->cmd_sn) || 3582 ((t_icmdp->cmd_sn - cmd_sn) > 3583 ISCSI_CMD_SN_WRAP))) { 3584 /* 3585 * Internally generated SCSI commands do not have 3586 * t_icmdp->cmd_lun set, but the LUN can be retrieved 3587 * from t_icmdp->cmd_un.scsi.lun. 3588 */ 3589 if ((t_icmdp->cmd_lun != NULL && 3590 t_icmdp->cmd_lun->lun_num == lun_num) || 3591 (t_icmdp->cmd_type == ISCSI_CMD_TYPE_SCSI && 3592 (t_icmdp->cmd_un.scsi.lun & ISCSI_LUN_MASK) == 3593 lun_num)) { 3594 t_icmdp->cmd_misc_flags |= 3595 ISCSI_CMD_MISCFLAG_FLUSH; 3596 if (t_icmdp->cmd_type == ISCSI_CMD_TYPE_SCSI) { 3597 t_icmdp->cmd_un.scsi.pkt_stat |= 3598 STAT_BUS_RESET; 3599 } 3600 } 3601 } 3602 mutex_exit(&t_icmdp->cmd_mutex); 3603 t_icmdp = next_icmdp; 3604 } 3605 } 3606 3607 /* 3608 * iscsi_decode_sense - decode the sense data in the cmd response 3609 * 3610 * Here we only care about Unit Attention with 0x29. 3611 */ 3612 static boolean_t 3613 iscsi_decode_sense(uint8_t *sense_data) 3614 { 3615 uint8_t sense_key = 0; 3616 uint8_t asc = 0; 3617 boolean_t affect = B_FALSE; 3618 3619 ASSERT(sense_data != NULL); 3620 3621 sense_key = scsi_sense_key(sense_data); 3622 switch (sense_key) { 3623 case KEY_UNIT_ATTENTION: 3624 asc = scsi_sense_asc(sense_data); 3625 switch (asc) { 3626 case ISCSI_SCSI_RESET_SENSE_CODE: 3627 /* 3628 * POWER ON, RESET, OR BUS_DEVICE RESET 3629 * OCCURRED 3630 */ 3631 affect = B_TRUE; 3632 break; 3633 default: 3634 /* 3635 * Currently we don't care 3636 * about other sense key. 3637 */ 3638 break; 3639 } 3640 break; 3641 default: 3642 /* 3643 * Currently we don't care 3644 * about other sense key. 3645 */ 3646 break; 3647 } 3648 return (affect); 3649 } 3650