Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1 | /* |
| 2 | * iSCSI lib functions |
| 3 | * |
| 4 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. |
| 5 | * Copyright (C) 2004 - 2006 Mike Christie |
| 6 | * Copyright (C) 2004 - 2005 Dmitry Yusupov |
| 7 | * Copyright (C) 2004 - 2005 Alex Aizman |
| 8 | * maintained by open-iscsi@googlegroups.com |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 23 | */ |
| 24 | #include <linux/types.h> |
| 25 | #include <linux/mutex.h> |
| 26 | #include <linux/kfifo.h> |
| 27 | #include <linux/delay.h> |
| 28 | #include <net/tcp.h> |
| 29 | #include <scsi/scsi_cmnd.h> |
| 30 | #include <scsi/scsi_device.h> |
| 31 | #include <scsi/scsi_eh.h> |
| 32 | #include <scsi/scsi_tcq.h> |
| 33 | #include <scsi/scsi_host.h> |
| 34 | #include <scsi/scsi.h> |
| 35 | #include <scsi/iscsi_proto.h> |
| 36 | #include <scsi/scsi_transport.h> |
| 37 | #include <scsi/scsi_transport_iscsi.h> |
| 38 | #include <scsi/libiscsi.h> |
| 39 | |
| 40 | struct iscsi_session * |
| 41 | class_to_transport_session(struct iscsi_cls_session *cls_session) |
| 42 | { |
| 43 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
| 44 | return iscsi_hostdata(shost->hostdata); |
| 45 | } |
| 46 | EXPORT_SYMBOL_GPL(class_to_transport_session); |
| 47 | |
| 48 | #define INVALID_SN_DELTA 0xffff |
| 49 | |
| 50 | int |
| 51 | iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) |
| 52 | { |
| 53 | uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); |
| 54 | uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); |
| 55 | |
| 56 | if (max_cmdsn < exp_cmdsn -1 && |
| 57 | max_cmdsn > exp_cmdsn - INVALID_SN_DELTA) |
| 58 | return ISCSI_ERR_MAX_CMDSN; |
| 59 | if (max_cmdsn > session->max_cmdsn || |
| 60 | max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA) |
| 61 | session->max_cmdsn = max_cmdsn; |
| 62 | if (exp_cmdsn > session->exp_cmdsn || |
| 63 | exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA) |
| 64 | session->exp_cmdsn = exp_cmdsn; |
| 65 | |
| 66 | return 0; |
| 67 | } |
| 68 | EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn); |
| 69 | |
| 70 | void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask, |
Mike Christie | ffd0436 | 2006-08-31 18:09:24 -0400 | [diff] [blame^] | 71 | struct iscsi_data *hdr) |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 72 | { |
| 73 | struct iscsi_conn *conn = ctask->conn; |
| 74 | |
| 75 | memset(hdr, 0, sizeof(struct iscsi_data)); |
| 76 | hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); |
| 77 | hdr->datasn = cpu_to_be32(ctask->unsol_datasn); |
| 78 | ctask->unsol_datasn++; |
| 79 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
| 80 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
| 81 | |
| 82 | hdr->itt = ctask->hdr->itt; |
| 83 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); |
Mike Christie | ffd0436 | 2006-08-31 18:09:24 -0400 | [diff] [blame^] | 84 | hdr->offset = cpu_to_be32(ctask->unsol_offset); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 85 | |
| 86 | if (ctask->unsol_count > conn->max_xmit_dlength) { |
| 87 | hton24(hdr->dlength, conn->max_xmit_dlength); |
| 88 | ctask->data_count = conn->max_xmit_dlength; |
Mike Christie | ffd0436 | 2006-08-31 18:09:24 -0400 | [diff] [blame^] | 89 | ctask->unsol_offset += ctask->data_count; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 90 | hdr->flags = 0; |
| 91 | } else { |
| 92 | hton24(hdr->dlength, ctask->unsol_count); |
| 93 | ctask->data_count = ctask->unsol_count; |
| 94 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
| 95 | } |
| 96 | } |
| 97 | EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); |
| 98 | |
| 99 | /** |
| 100 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu |
| 101 | * @ctask: iscsi cmd task |
| 102 | * |
| 103 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set |
| 104 | * fields like dlength or final based on how much data it sends |
| 105 | */ |
| 106 | static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) |
| 107 | { |
| 108 | struct iscsi_conn *conn = ctask->conn; |
| 109 | struct iscsi_session *session = conn->session; |
| 110 | struct iscsi_cmd *hdr = ctask->hdr; |
| 111 | struct scsi_cmnd *sc = ctask->sc; |
| 112 | |
| 113 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
| 114 | hdr->flags = ISCSI_ATTR_SIMPLE; |
| 115 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); |
| 116 | hdr->itt = ctask->itt | (conn->id << ISCSI_CID_SHIFT) | |
| 117 | (session->age << ISCSI_AGE_SHIFT); |
| 118 | hdr->data_length = cpu_to_be32(sc->request_bufflen); |
| 119 | hdr->cmdsn = cpu_to_be32(session->cmdsn); |
| 120 | session->cmdsn++; |
| 121 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); |
| 122 | memcpy(hdr->cdb, sc->cmnd, sc->cmd_len); |
| 123 | memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len); |
| 124 | |
Mike Christie | ffd0436 | 2006-08-31 18:09:24 -0400 | [diff] [blame^] | 125 | ctask->data_count = 0; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 126 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
| 127 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
| 128 | /* |
| 129 | * Write counters: |
| 130 | * |
| 131 | * imm_count bytes to be sent right after |
| 132 | * SCSI PDU Header |
| 133 | * |
| 134 | * unsol_count bytes(as Data-Out) to be sent |
| 135 | * without R2T ack right after |
| 136 | * immediate data |
| 137 | * |
| 138 | * r2t_data_count bytes to be sent via R2T ack's |
| 139 | * |
| 140 | * pad_count bytes to be sent as zero-padding |
| 141 | */ |
| 142 | ctask->imm_count = 0; |
| 143 | ctask->unsol_count = 0; |
Mike Christie | ffd0436 | 2006-08-31 18:09:24 -0400 | [diff] [blame^] | 144 | ctask->unsol_offset = 0; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 145 | ctask->unsol_datasn = 0; |
| 146 | |
| 147 | if (session->imm_data_en) { |
| 148 | if (ctask->total_length >= session->first_burst) |
| 149 | ctask->imm_count = min(session->first_burst, |
| 150 | conn->max_xmit_dlength); |
| 151 | else |
| 152 | ctask->imm_count = min(ctask->total_length, |
| 153 | conn->max_xmit_dlength); |
| 154 | hton24(ctask->hdr->dlength, ctask->imm_count); |
| 155 | } else |
| 156 | zero_data(ctask->hdr->dlength); |
| 157 | |
Mike Christie | ffd0436 | 2006-08-31 18:09:24 -0400 | [diff] [blame^] | 158 | if (!session->initial_r2t_en) { |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 159 | ctask->unsol_count = min(session->first_burst, |
| 160 | ctask->total_length) - ctask->imm_count; |
Mike Christie | ffd0436 | 2006-08-31 18:09:24 -0400 | [diff] [blame^] | 161 | ctask->unsol_offset = ctask->imm_count; |
| 162 | } |
| 163 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 164 | if (!ctask->unsol_count) |
| 165 | /* No unsolicit Data-Out's */ |
| 166 | ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
| 167 | } else { |
| 168 | ctask->datasn = 0; |
| 169 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
| 170 | zero_data(hdr->dlength); |
| 171 | |
| 172 | if (sc->sc_data_direction == DMA_FROM_DEVICE) |
| 173 | hdr->flags |= ISCSI_FLAG_CMD_READ; |
| 174 | } |
| 175 | |
| 176 | conn->scsicmd_pdus_cnt++; |
| 177 | } |
| 178 | EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu); |
| 179 | |
| 180 | /** |
| 181 | * iscsi_complete_command - return command back to scsi-ml |
| 182 | * @session: iscsi session |
| 183 | * @ctask: iscsi cmd task |
| 184 | * |
| 185 | * Must be called with session lock. |
| 186 | * This function returns the scsi command to scsi-ml and returns |
| 187 | * the cmd task to the pool of available cmd tasks. |
| 188 | */ |
| 189 | static void iscsi_complete_command(struct iscsi_session *session, |
| 190 | struct iscsi_cmd_task *ctask) |
| 191 | { |
| 192 | struct scsi_cmnd *sc = ctask->sc; |
| 193 | |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame] | 194 | ctask->state = ISCSI_TASK_COMPLETED; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 195 | ctask->sc = NULL; |
| 196 | list_del_init(&ctask->running); |
| 197 | __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); |
| 198 | sc->scsi_done(sc); |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * iscsi_cmd_rsp - SCSI Command Response processing |
| 203 | * @conn: iscsi connection |
| 204 | * @hdr: iscsi header |
| 205 | * @ctask: scsi command task |
| 206 | * @data: cmd data buffer |
| 207 | * @datalen: len of buffer |
| 208 | * |
| 209 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and |
| 210 | * then completes the command and task. |
| 211 | **/ |
| 212 | static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
| 213 | struct iscsi_cmd_task *ctask, char *data, |
| 214 | int datalen) |
| 215 | { |
| 216 | int rc; |
| 217 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; |
| 218 | struct iscsi_session *session = conn->session; |
| 219 | struct scsi_cmnd *sc = ctask->sc; |
| 220 | |
| 221 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); |
| 222 | if (rc) { |
| 223 | sc->result = DID_ERROR << 16; |
| 224 | goto out; |
| 225 | } |
| 226 | |
| 227 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
| 228 | |
| 229 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
| 230 | |
| 231 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { |
| 232 | sc->result = DID_ERROR << 16; |
| 233 | goto out; |
| 234 | } |
| 235 | |
| 236 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { |
| 237 | int senselen; |
| 238 | |
| 239 | if (datalen < 2) { |
| 240 | invalid_datalen: |
Or Gerlitz | be2df72 | 2006-05-02 19:46:43 -0500 | [diff] [blame] | 241 | printk(KERN_ERR "iscsi: Got CHECK_CONDITION but " |
| 242 | "invalid data buffer size of %d\n", datalen); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 243 | sc->result = DID_BAD_TARGET << 16; |
| 244 | goto out; |
| 245 | } |
| 246 | |
| 247 | senselen = (data[0] << 8) | data[1]; |
| 248 | if (datalen < senselen) |
| 249 | goto invalid_datalen; |
| 250 | |
| 251 | memcpy(sc->sense_buffer, data + 2, |
| 252 | min(senselen, SCSI_SENSE_BUFFERSIZE)); |
| 253 | debug_scsi("copied %d bytes of sense\n", |
| 254 | min(senselen, SCSI_SENSE_BUFFERSIZE)); |
| 255 | } |
| 256 | |
| 257 | if (sc->sc_data_direction == DMA_TO_DEVICE) |
| 258 | goto out; |
| 259 | |
| 260 | if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { |
| 261 | int res_count = be32_to_cpu(rhdr->residual_count); |
| 262 | |
| 263 | if (res_count > 0 && res_count <= sc->request_bufflen) |
| 264 | sc->resid = res_count; |
| 265 | else |
| 266 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; |
| 267 | } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) |
| 268 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; |
| 269 | else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) |
| 270 | sc->resid = be32_to_cpu(rhdr->residual_count); |
| 271 | |
| 272 | out: |
| 273 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", |
| 274 | (long)sc, sc->result, ctask->itt); |
| 275 | conn->scsirsp_pdus_cnt++; |
| 276 | |
| 277 | iscsi_complete_command(conn->session, ctask); |
| 278 | return rc; |
| 279 | } |
| 280 | |
Mike Christie | 7ea8b82 | 2006-07-24 15:47:22 -0500 | [diff] [blame] | 281 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
| 282 | { |
| 283 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; |
| 284 | |
| 285 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
| 286 | conn->tmfrsp_pdus_cnt++; |
| 287 | |
| 288 | if (conn->tmabort_state != TMABORT_INITIAL) |
| 289 | return; |
| 290 | |
| 291 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) |
| 292 | conn->tmabort_state = TMABORT_SUCCESS; |
| 293 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
| 294 | conn->tmabort_state = TMABORT_NOT_FOUND; |
| 295 | else |
| 296 | conn->tmabort_state = TMABORT_FAILED; |
| 297 | wake_up(&conn->ehwait); |
| 298 | } |
| 299 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 300 | /** |
| 301 | * __iscsi_complete_pdu - complete pdu |
| 302 | * @conn: iscsi conn |
| 303 | * @hdr: iscsi header |
| 304 | * @data: data buffer |
| 305 | * @datalen: len of data buffer |
| 306 | * |
| 307 | * Completes pdu processing by freeing any resources allocated at |
| 308 | * queuecommand or send generic. session lock must be held and verify |
| 309 | * itt must have been called. |
| 310 | */ |
| 311 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
| 312 | char *data, int datalen) |
| 313 | { |
| 314 | struct iscsi_session *session = conn->session; |
| 315 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; |
| 316 | struct iscsi_cmd_task *ctask; |
| 317 | struct iscsi_mgmt_task *mtask; |
| 318 | uint32_t itt; |
| 319 | |
| 320 | if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) |
| 321 | itt = hdr->itt & ISCSI_ITT_MASK; |
| 322 | else |
| 323 | itt = hdr->itt; |
| 324 | |
| 325 | if (itt < session->cmds_max) { |
| 326 | ctask = session->cmds[itt]; |
| 327 | |
| 328 | debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n", |
| 329 | opcode, conn->id, ctask->itt, datalen); |
| 330 | |
| 331 | switch(opcode) { |
| 332 | case ISCSI_OP_SCSI_CMD_RSP: |
| 333 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); |
| 334 | rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data, |
| 335 | datalen); |
| 336 | break; |
| 337 | case ISCSI_OP_SCSI_DATA_IN: |
| 338 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); |
| 339 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { |
| 340 | conn->scsirsp_pdus_cnt++; |
| 341 | iscsi_complete_command(session, ctask); |
| 342 | } |
| 343 | break; |
| 344 | case ISCSI_OP_R2T: |
| 345 | /* LLD handles this for now */ |
| 346 | break; |
| 347 | default: |
| 348 | rc = ISCSI_ERR_BAD_OPCODE; |
| 349 | break; |
| 350 | } |
| 351 | } else if (itt >= ISCSI_MGMT_ITT_OFFSET && |
| 352 | itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) { |
| 353 | mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET]; |
| 354 | |
| 355 | debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", |
| 356 | opcode, conn->id, mtask->itt, datalen); |
| 357 | |
Mike Christie | 8d2860b | 2006-05-02 19:46:47 -0500 | [diff] [blame] | 358 | rc = iscsi_check_assign_cmdsn(session, |
| 359 | (struct iscsi_nopin*)hdr); |
| 360 | if (rc) |
| 361 | goto done; |
| 362 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 363 | switch(opcode) { |
Mike Christie | 8d2860b | 2006-05-02 19:46:47 -0500 | [diff] [blame] | 364 | case ISCSI_OP_LOGOUT_RSP: |
Mike Christie | c8dc1e5 | 2006-07-24 15:47:39 -0500 | [diff] [blame] | 365 | if (datalen) { |
| 366 | rc = ISCSI_ERR_PROTO; |
| 367 | break; |
| 368 | } |
Mike Christie | 8d2860b | 2006-05-02 19:46:47 -0500 | [diff] [blame] | 369 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
| 370 | /* fall through */ |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 371 | case ISCSI_OP_LOGIN_RSP: |
| 372 | case ISCSI_OP_TEXT_RSP: |
Mike Christie | 8d2860b | 2006-05-02 19:46:47 -0500 | [diff] [blame] | 373 | /* |
| 374 | * login related PDU's exp_statsn is handled in |
| 375 | * userspace |
| 376 | */ |
Mike Christie | 40527af | 2006-07-24 15:47:45 -0500 | [diff] [blame] | 377 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
| 378 | rc = ISCSI_ERR_CONN_FAILED; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 379 | list_del(&mtask->running); |
| 380 | if (conn->login_mtask != mtask) |
| 381 | __kfifo_put(session->mgmtpool.queue, |
| 382 | (void*)&mtask, sizeof(void*)); |
| 383 | break; |
| 384 | case ISCSI_OP_SCSI_TMFUNC_RSP: |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 385 | if (datalen) { |
| 386 | rc = ISCSI_ERR_PROTO; |
| 387 | break; |
| 388 | } |
Mike Christie | 8d2860b | 2006-05-02 19:46:47 -0500 | [diff] [blame] | 389 | |
Mike Christie | 7ea8b82 | 2006-07-24 15:47:22 -0500 | [diff] [blame] | 390 | iscsi_tmf_rsp(conn, hdr); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 391 | break; |
| 392 | case ISCSI_OP_NOOP_IN: |
Mike Christie | c8dc1e5 | 2006-07-24 15:47:39 -0500 | [diff] [blame] | 393 | if (hdr->ttt != ISCSI_RESERVED_TAG || datalen) { |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 394 | rc = ISCSI_ERR_PROTO; |
| 395 | break; |
| 396 | } |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 397 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
| 398 | |
Mike Christie | 40527af | 2006-07-24 15:47:45 -0500 | [diff] [blame] | 399 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
| 400 | rc = ISCSI_ERR_CONN_FAILED; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 401 | list_del(&mtask->running); |
| 402 | if (conn->login_mtask != mtask) |
| 403 | __kfifo_put(session->mgmtpool.queue, |
| 404 | (void*)&mtask, sizeof(void*)); |
| 405 | break; |
| 406 | default: |
| 407 | rc = ISCSI_ERR_BAD_OPCODE; |
| 408 | break; |
| 409 | } |
| 410 | } else if (itt == ISCSI_RESERVED_TAG) { |
| 411 | switch(opcode) { |
| 412 | case ISCSI_OP_NOOP_IN: |
Mike Christie | 40527af | 2006-07-24 15:47:45 -0500 | [diff] [blame] | 413 | if (datalen) { |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 414 | rc = ISCSI_ERR_PROTO; |
Mike Christie | 40527af | 2006-07-24 15:47:45 -0500 | [diff] [blame] | 415 | break; |
| 416 | } |
| 417 | |
| 418 | rc = iscsi_check_assign_cmdsn(session, |
| 419 | (struct iscsi_nopin*)hdr); |
| 420 | if (rc) |
| 421 | break; |
| 422 | |
| 423 | if (hdr->ttt == ISCSI_RESERVED_TAG) |
| 424 | break; |
| 425 | |
| 426 | if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0)) |
| 427 | rc = ISCSI_ERR_CONN_FAILED; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 428 | break; |
| 429 | case ISCSI_OP_REJECT: |
| 430 | /* we need sth like iscsi_reject_rsp()*/ |
| 431 | case ISCSI_OP_ASYNC_EVENT: |
Mike Christie | 8d2860b | 2006-05-02 19:46:47 -0500 | [diff] [blame] | 432 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 433 | /* we need sth like iscsi_async_event_rsp() */ |
| 434 | rc = ISCSI_ERR_BAD_OPCODE; |
| 435 | break; |
| 436 | default: |
| 437 | rc = ISCSI_ERR_BAD_OPCODE; |
| 438 | break; |
| 439 | } |
| 440 | } else |
| 441 | rc = ISCSI_ERR_BAD_ITT; |
| 442 | |
Mike Christie | 8d2860b | 2006-05-02 19:46:47 -0500 | [diff] [blame] | 443 | done: |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 444 | return rc; |
| 445 | } |
| 446 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
| 447 | |
| 448 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
| 449 | char *data, int datalen) |
| 450 | { |
| 451 | int rc; |
| 452 | |
| 453 | spin_lock(&conn->session->lock); |
| 454 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); |
| 455 | spin_unlock(&conn->session->lock); |
| 456 | return rc; |
| 457 | } |
| 458 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); |
| 459 | |
| 460 | /* verify itt (itt encoding: age+cid+itt) */ |
| 461 | int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
| 462 | uint32_t *ret_itt) |
| 463 | { |
| 464 | struct iscsi_session *session = conn->session; |
| 465 | struct iscsi_cmd_task *ctask; |
| 466 | uint32_t itt; |
| 467 | |
| 468 | if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { |
| 469 | if ((hdr->itt & ISCSI_AGE_MASK) != |
| 470 | (session->age << ISCSI_AGE_SHIFT)) { |
Or Gerlitz | be2df72 | 2006-05-02 19:46:43 -0500 | [diff] [blame] | 471 | printk(KERN_ERR "iscsi: received itt %x expected " |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 472 | "session age (%x)\n", hdr->itt, |
| 473 | session->age & ISCSI_AGE_MASK); |
| 474 | return ISCSI_ERR_BAD_ITT; |
| 475 | } |
| 476 | |
| 477 | if ((hdr->itt & ISCSI_CID_MASK) != |
| 478 | (conn->id << ISCSI_CID_SHIFT)) { |
Or Gerlitz | be2df72 | 2006-05-02 19:46:43 -0500 | [diff] [blame] | 479 | printk(KERN_ERR "iscsi: received itt %x, expected " |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 480 | "CID (%x)\n", hdr->itt, conn->id); |
| 481 | return ISCSI_ERR_BAD_ITT; |
| 482 | } |
| 483 | itt = hdr->itt & ISCSI_ITT_MASK; |
| 484 | } else |
| 485 | itt = hdr->itt; |
| 486 | |
| 487 | if (itt < session->cmds_max) { |
| 488 | ctask = session->cmds[itt]; |
| 489 | |
| 490 | if (!ctask->sc) { |
Or Gerlitz | be2df72 | 2006-05-02 19:46:43 -0500 | [diff] [blame] | 491 | printk(KERN_INFO "iscsi: dropping ctask with " |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 492 | "itt 0x%x\n", ctask->itt); |
| 493 | /* force drop */ |
| 494 | return ISCSI_ERR_NO_SCSI_CMD; |
| 495 | } |
| 496 | |
| 497 | if (ctask->sc->SCp.phase != session->age) { |
Or Gerlitz | be2df72 | 2006-05-02 19:46:43 -0500 | [diff] [blame] | 498 | printk(KERN_ERR "iscsi: ctask's session age %d, " |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 499 | "expected %d\n", ctask->sc->SCp.phase, |
| 500 | session->age); |
| 501 | return ISCSI_ERR_SESSION_FAILED; |
| 502 | } |
| 503 | } |
| 504 | |
| 505 | *ret_itt = itt; |
| 506 | return 0; |
| 507 | } |
| 508 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); |
| 509 | |
| 510 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
| 511 | { |
| 512 | struct iscsi_session *session = conn->session; |
| 513 | unsigned long flags; |
| 514 | |
| 515 | spin_lock_irqsave(&session->lock, flags); |
Mike Christie | 656cffc | 2006-05-18 20:31:42 -0500 | [diff] [blame] | 516 | if (session->state == ISCSI_STATE_FAILED) { |
| 517 | spin_unlock_irqrestore(&session->lock, flags); |
| 518 | return; |
| 519 | } |
| 520 | |
Mike Christie | 67a6111 | 2006-05-30 00:37:20 -0500 | [diff] [blame] | 521 | if (conn->stop_stage == 0) |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 522 | session->state = ISCSI_STATE_FAILED; |
| 523 | spin_unlock_irqrestore(&session->lock, flags); |
| 524 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
| 525 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); |
| 526 | iscsi_conn_error(conn->cls_conn, err); |
| 527 | } |
| 528 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); |
| 529 | |
| 530 | /** |
| 531 | * iscsi_data_xmit - xmit any command into the scheduled connection |
| 532 | * @conn: iscsi connection |
| 533 | * |
| 534 | * Notes: |
| 535 | * The function can return -EAGAIN in which case the caller must |
| 536 | * re-schedule it again later or recover. '0' return code means |
| 537 | * successful xmit. |
| 538 | **/ |
| 539 | static int iscsi_data_xmit(struct iscsi_conn *conn) |
| 540 | { |
| 541 | struct iscsi_transport *tt; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 542 | int rc = 0; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 543 | |
| 544 | if (unlikely(conn->suspend_tx)) { |
| 545 | debug_scsi("conn %d Tx suspended!\n", conn->id); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 546 | return -ENODATA; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 547 | } |
| 548 | tt = conn->session->tt; |
| 549 | |
| 550 | /* |
| 551 | * Transmit in the following order: |
| 552 | * |
| 553 | * 1) un-finished xmit (ctask or mtask) |
| 554 | * 2) immediate control PDUs |
| 555 | * 3) write data |
| 556 | * 4) SCSI commands |
| 557 | * 5) non-immediate control PDUs |
| 558 | * |
| 559 | * No need to lock around __kfifo_get as long as |
| 560 | * there's one producer and one consumer. |
| 561 | */ |
| 562 | |
| 563 | BUG_ON(conn->ctask && conn->mtask); |
| 564 | |
| 565 | if (conn->ctask) { |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 566 | rc = tt->xmit_cmd_task(conn, conn->ctask); |
| 567 | if (rc) |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 568 | goto again; |
| 569 | /* done with this in-progress ctask */ |
| 570 | conn->ctask = NULL; |
| 571 | } |
| 572 | if (conn->mtask) { |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 573 | rc = tt->xmit_mgmt_task(conn, conn->mtask); |
| 574 | if (rc) |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 575 | goto again; |
| 576 | /* done with this in-progress mtask */ |
| 577 | conn->mtask = NULL; |
| 578 | } |
| 579 | |
| 580 | /* process immediate first */ |
| 581 | if (unlikely(__kfifo_len(conn->immqueue))) { |
| 582 | while (__kfifo_get(conn->immqueue, (void*)&conn->mtask, |
| 583 | sizeof(void*))) { |
Mike Christie | 994442e | 2006-05-30 00:37:22 -0500 | [diff] [blame] | 584 | spin_lock_bh(&conn->session->lock); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 585 | list_add_tail(&conn->mtask->running, |
| 586 | &conn->mgmt_run_list); |
Mike Christie | 994442e | 2006-05-30 00:37:22 -0500 | [diff] [blame] | 587 | spin_unlock_bh(&conn->session->lock); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 588 | rc = tt->xmit_mgmt_task(conn, conn->mtask); |
| 589 | if (rc) |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 590 | goto again; |
| 591 | } |
| 592 | /* done with this mtask */ |
| 593 | conn->mtask = NULL; |
| 594 | } |
| 595 | |
| 596 | /* process command queue */ |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame] | 597 | spin_lock_bh(&conn->session->lock); |
| 598 | while (!list_empty(&conn->xmitqueue)) { |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 599 | /* |
| 600 | * iscsi tcp may readd the task to the xmitqueue to send |
| 601 | * write data |
| 602 | */ |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame] | 603 | conn->ctask = list_entry(conn->xmitqueue.next, |
| 604 | struct iscsi_cmd_task, running); |
| 605 | conn->ctask->state = ISCSI_TASK_RUNNING; |
| 606 | list_move_tail(conn->xmitqueue.next, &conn->run_list); |
Mike Christie | 994442e | 2006-05-30 00:37:22 -0500 | [diff] [blame] | 607 | spin_unlock_bh(&conn->session->lock); |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame] | 608 | |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 609 | rc = tt->xmit_cmd_task(conn, conn->ctask); |
| 610 | if (rc) |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 611 | goto again; |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame] | 612 | spin_lock_bh(&conn->session->lock); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 613 | } |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame] | 614 | spin_unlock_bh(&conn->session->lock); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 615 | /* done with this ctask */ |
| 616 | conn->ctask = NULL; |
| 617 | |
| 618 | /* process the rest control plane PDUs, if any */ |
| 619 | if (unlikely(__kfifo_len(conn->mgmtqueue))) { |
| 620 | while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask, |
| 621 | sizeof(void*))) { |
Mike Christie | 994442e | 2006-05-30 00:37:22 -0500 | [diff] [blame] | 622 | spin_lock_bh(&conn->session->lock); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 623 | list_add_tail(&conn->mtask->running, |
| 624 | &conn->mgmt_run_list); |
Mike Christie | 994442e | 2006-05-30 00:37:22 -0500 | [diff] [blame] | 625 | spin_unlock_bh(&conn->session->lock); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 626 | rc = tt->xmit_mgmt_task(conn, conn->mtask); |
| 627 | if (rc) |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 628 | goto again; |
| 629 | } |
| 630 | /* done with this mtask */ |
| 631 | conn->mtask = NULL; |
| 632 | } |
| 633 | |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 634 | return -ENODATA; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 635 | |
| 636 | again: |
| 637 | if (unlikely(conn->suspend_tx)) |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 638 | return -ENODATA; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 639 | |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 640 | return rc; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 641 | } |
| 642 | |
| 643 | static void iscsi_xmitworker(void *data) |
| 644 | { |
| 645 | struct iscsi_conn *conn = data; |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 646 | int rc; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 647 | /* |
| 648 | * serialize Xmit worker on a per-connection basis. |
| 649 | */ |
| 650 | mutex_lock(&conn->xmitmutex); |
Mike Christie | 3219e52 | 2006-05-30 00:37:28 -0500 | [diff] [blame] | 651 | do { |
| 652 | rc = iscsi_data_xmit(conn); |
| 653 | } while (rc >= 0 || rc == -EAGAIN); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 654 | mutex_unlock(&conn->xmitmutex); |
| 655 | } |
| 656 | |
| 657 | enum { |
| 658 | FAILURE_BAD_HOST = 1, |
| 659 | FAILURE_SESSION_FAILED, |
| 660 | FAILURE_SESSION_FREED, |
| 661 | FAILURE_WINDOW_CLOSED, |
| 662 | FAILURE_SESSION_TERMINATE, |
Mike Christie | 656cffc | 2006-05-18 20:31:42 -0500 | [diff] [blame] | 663 | FAILURE_SESSION_IN_RECOVERY, |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 664 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
| 665 | }; |
| 666 | |
| 667 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) |
| 668 | { |
| 669 | struct Scsi_Host *host; |
| 670 | int reason = 0; |
| 671 | struct iscsi_session *session; |
| 672 | struct iscsi_conn *conn; |
| 673 | struct iscsi_cmd_task *ctask = NULL; |
| 674 | |
| 675 | sc->scsi_done = done; |
| 676 | sc->result = 0; |
| 677 | |
| 678 | host = sc->device->host; |
| 679 | session = iscsi_hostdata(host->hostdata); |
| 680 | |
| 681 | spin_lock(&session->lock); |
| 682 | |
Mike Christie | 656cffc | 2006-05-18 20:31:42 -0500 | [diff] [blame] | 683 | /* |
| 684 | * ISCSI_STATE_FAILED is a temp. state. The recovery |
| 685 | * code will decide what is best to do with command queued |
| 686 | * during this time |
| 687 | */ |
| 688 | if (session->state != ISCSI_STATE_LOGGED_IN && |
| 689 | session->state != ISCSI_STATE_FAILED) { |
| 690 | /* |
| 691 | * to handle the race between when we set the recovery state |
| 692 | * and block the session we requeue here (commands could |
| 693 | * be entering our queuecommand while a block is starting |
| 694 | * up because the block code is not locked) |
| 695 | */ |
| 696 | if (session->state == ISCSI_STATE_IN_RECOVERY) { |
| 697 | reason = FAILURE_SESSION_IN_RECOVERY; |
Mike Christie | 67a6111 | 2006-05-30 00:37:20 -0500 | [diff] [blame] | 698 | goto reject; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 699 | } |
Mike Christie | 656cffc | 2006-05-18 20:31:42 -0500 | [diff] [blame] | 700 | |
| 701 | if (session->state == ISCSI_STATE_RECOVERY_FAILED) |
| 702 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
| 703 | else if (session->state == ISCSI_STATE_TERMINATE) |
| 704 | reason = FAILURE_SESSION_TERMINATE; |
| 705 | else |
| 706 | reason = FAILURE_SESSION_FREED; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 707 | goto fault; |
| 708 | } |
| 709 | |
| 710 | /* |
| 711 | * Check for iSCSI window and take care of CmdSN wrap-around |
| 712 | */ |
| 713 | if ((int)(session->max_cmdsn - session->cmdsn) < 0) { |
| 714 | reason = FAILURE_WINDOW_CLOSED; |
| 715 | goto reject; |
| 716 | } |
| 717 | |
| 718 | conn = session->leadconn; |
| 719 | |
| 720 | __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); |
| 721 | sc->SCp.phase = session->age; |
| 722 | sc->SCp.ptr = (char *)ctask; |
| 723 | |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame] | 724 | ctask->state = ISCSI_TASK_PENDING; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 725 | ctask->mtask = NULL; |
| 726 | ctask->conn = conn; |
| 727 | ctask->sc = sc; |
| 728 | INIT_LIST_HEAD(&ctask->running); |
| 729 | ctask->total_length = sc->request_bufflen; |
| 730 | iscsi_prep_scsi_cmd_pdu(ctask); |
| 731 | |
| 732 | session->tt->init_cmd_task(ctask); |
| 733 | |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame] | 734 | list_add_tail(&ctask->running, &conn->xmitqueue); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 735 | debug_scsi( |
| 736 | "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n", |
| 737 | sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", |
| 738 | conn->id, (long)sc, ctask->itt, sc->request_bufflen, |
| 739 | session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); |
| 740 | spin_unlock(&session->lock); |
| 741 | |
| 742 | scsi_queue_work(host, &conn->xmitwork); |
| 743 | return 0; |
| 744 | |
| 745 | reject: |
| 746 | spin_unlock(&session->lock); |
| 747 | debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); |
| 748 | return SCSI_MLQUEUE_HOST_BUSY; |
| 749 | |
| 750 | fault: |
| 751 | spin_unlock(&session->lock); |
Or Gerlitz | be2df72 | 2006-05-02 19:46:43 -0500 | [diff] [blame] | 752 | printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n", |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 753 | sc->cmnd[0], reason); |
| 754 | sc->result = (DID_NO_CONNECT << 16); |
| 755 | sc->resid = sc->request_bufflen; |
| 756 | sc->scsi_done(sc); |
| 757 | return 0; |
| 758 | } |
| 759 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); |
| 760 | |
| 761 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) |
| 762 | { |
| 763 | if (depth > ISCSI_MAX_CMD_PER_LUN) |
| 764 | depth = ISCSI_MAX_CMD_PER_LUN; |
| 765 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); |
| 766 | return sdev->queue_depth; |
| 767 | } |
| 768 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); |
| 769 | |
| 770 | static int |
| 771 | iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
| 772 | char *data, uint32_t data_size) |
| 773 | { |
| 774 | struct iscsi_session *session = conn->session; |
| 775 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; |
| 776 | struct iscsi_mgmt_task *mtask; |
| 777 | |
| 778 | spin_lock_bh(&session->lock); |
| 779 | if (session->state == ISCSI_STATE_TERMINATE) { |
| 780 | spin_unlock_bh(&session->lock); |
| 781 | return -EPERM; |
| 782 | } |
| 783 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || |
| 784 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) |
| 785 | /* |
| 786 | * Login and Text are sent serially, in |
| 787 | * request-followed-by-response sequence. |
| 788 | * Same mtask can be used. Same ITT must be used. |
| 789 | * Note that login_mtask is preallocated at conn_create(). |
| 790 | */ |
| 791 | mtask = conn->login_mtask; |
| 792 | else { |
Mike Christie | 656cffc | 2006-05-18 20:31:42 -0500 | [diff] [blame] | 793 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
| 794 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 795 | |
Mike Christie | 8d2860b | 2006-05-02 19:46:47 -0500 | [diff] [blame] | 796 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 797 | if (!__kfifo_get(session->mgmtpool.queue, |
| 798 | (void*)&mtask, sizeof(void*))) { |
| 799 | spin_unlock_bh(&session->lock); |
| 800 | return -ENOSPC; |
| 801 | } |
| 802 | } |
| 803 | |
| 804 | /* |
Mike Christie | 8d2860b | 2006-05-02 19:46:47 -0500 | [diff] [blame] | 805 | * pre-format CmdSN for outgoing PDU. |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 806 | */ |
| 807 | if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { |
| 808 | hdr->itt = mtask->itt | (conn->id << ISCSI_CID_SHIFT) | |
| 809 | (session->age << ISCSI_AGE_SHIFT); |
| 810 | nop->cmdsn = cpu_to_be32(session->cmdsn); |
| 811 | if (conn->c_stage == ISCSI_CONN_STARTED && |
| 812 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) |
| 813 | session->cmdsn++; |
| 814 | } else |
| 815 | /* do not advance CmdSN */ |
| 816 | nop->cmdsn = cpu_to_be32(session->cmdsn); |
| 817 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 818 | if (data_size) { |
| 819 | memcpy(mtask->data, data, data_size); |
| 820 | mtask->data_count = data_size; |
| 821 | } else |
| 822 | mtask->data_count = 0; |
| 823 | |
| 824 | INIT_LIST_HEAD(&mtask->running); |
| 825 | memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr)); |
| 826 | if (session->tt->init_mgmt_task) |
| 827 | session->tt->init_mgmt_task(conn, mtask, data, data_size); |
| 828 | spin_unlock_bh(&session->lock); |
| 829 | |
| 830 | debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", |
| 831 | hdr->opcode, hdr->itt, data_size); |
| 832 | |
| 833 | /* |
| 834 | * since send_pdu() could be called at least from two contexts, |
| 835 | * we need to serialize __kfifo_put, so we don't have to take |
| 836 | * additional lock on fast data-path |
| 837 | */ |
| 838 | if (hdr->opcode & ISCSI_OP_IMMEDIATE) |
| 839 | __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*)); |
| 840 | else |
| 841 | __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*)); |
| 842 | |
| 843 | scsi_queue_work(session->host, &conn->xmitwork); |
| 844 | return 0; |
| 845 | } |
| 846 | |
| 847 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, |
| 848 | char *data, uint32_t data_size) |
| 849 | { |
| 850 | struct iscsi_conn *conn = cls_conn->dd_data; |
| 851 | int rc; |
| 852 | |
| 853 | mutex_lock(&conn->xmitmutex); |
| 854 | rc = iscsi_conn_send_generic(conn, hdr, data, data_size); |
| 855 | mutex_unlock(&conn->xmitmutex); |
| 856 | |
| 857 | return rc; |
| 858 | } |
| 859 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); |
| 860 | |
| 861 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
| 862 | { |
| 863 | struct iscsi_session *session = class_to_transport_session(cls_session); |
| 864 | struct iscsi_conn *conn = session->leadconn; |
| 865 | |
| 866 | spin_lock_bh(&session->lock); |
| 867 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
Mike Christie | 656cffc | 2006-05-18 20:31:42 -0500 | [diff] [blame] | 868 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 869 | if (conn) |
| 870 | wake_up(&conn->ehwait); |
| 871 | } |
| 872 | spin_unlock_bh(&session->lock); |
| 873 | } |
| 874 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); |
| 875 | |
| 876 | int iscsi_eh_host_reset(struct scsi_cmnd *sc) |
| 877 | { |
| 878 | struct Scsi_Host *host = sc->device->host; |
| 879 | struct iscsi_session *session = iscsi_hostdata(host->hostdata); |
| 880 | struct iscsi_conn *conn = session->leadconn; |
| 881 | int fail_session = 0; |
| 882 | |
| 883 | spin_lock_bh(&session->lock); |
| 884 | if (session->state == ISCSI_STATE_TERMINATE) { |
| 885 | failed: |
| 886 | debug_scsi("failing host reset: session terminated " |
| 887 | "[CID %d age %d]", conn->id, session->age); |
| 888 | spin_unlock_bh(&session->lock); |
| 889 | return FAILED; |
| 890 | } |
| 891 | |
| 892 | if (sc->SCp.phase == session->age) { |
| 893 | debug_scsi("failing connection CID %d due to SCSI host reset", |
| 894 | conn->id); |
| 895 | fail_session = 1; |
| 896 | } |
| 897 | spin_unlock_bh(&session->lock); |
| 898 | |
| 899 | /* |
| 900 | * we drop the lock here but the leadconn cannot be destoyed while |
| 901 | * we are in the scsi eh |
| 902 | */ |
Mike Christie | 656cffc | 2006-05-18 20:31:42 -0500 | [diff] [blame] | 903 | if (fail_session) |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 904 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 905 | |
| 906 | debug_scsi("iscsi_eh_host_reset wait for relogin\n"); |
| 907 | wait_event_interruptible(conn->ehwait, |
| 908 | session->state == ISCSI_STATE_TERMINATE || |
| 909 | session->state == ISCSI_STATE_LOGGED_IN || |
Mike Christie | 656cffc | 2006-05-18 20:31:42 -0500 | [diff] [blame] | 910 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 911 | if (signal_pending(current)) |
| 912 | flush_signals(current); |
| 913 | |
| 914 | spin_lock_bh(&session->lock); |
| 915 | if (session->state == ISCSI_STATE_LOGGED_IN) |
Or Gerlitz | be2df72 | 2006-05-02 19:46:43 -0500 | [diff] [blame] | 916 | printk(KERN_INFO "iscsi: host reset succeeded\n"); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 917 | else |
| 918 | goto failed; |
| 919 | spin_unlock_bh(&session->lock); |
| 920 | |
| 921 | return SUCCESS; |
| 922 | } |
| 923 | EXPORT_SYMBOL_GPL(iscsi_eh_host_reset); |
| 924 | |
| 925 | static void iscsi_tmabort_timedout(unsigned long data) |
| 926 | { |
| 927 | struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data; |
| 928 | struct iscsi_conn *conn = ctask->conn; |
| 929 | struct iscsi_session *session = conn->session; |
| 930 | |
| 931 | spin_lock(&session->lock); |
| 932 | if (conn->tmabort_state == TMABORT_INITIAL) { |
| 933 | conn->tmabort_state = TMABORT_TIMEDOUT; |
| 934 | debug_scsi("tmabort timedout [sc %p itt 0x%x]\n", |
| 935 | ctask->sc, ctask->itt); |
| 936 | /* unblock eh_abort() */ |
| 937 | wake_up(&conn->ehwait); |
| 938 | } |
| 939 | spin_unlock(&session->lock); |
| 940 | } |
| 941 | |
| 942 | /* must be called with the mutex lock */ |
| 943 | static int iscsi_exec_abort_task(struct scsi_cmnd *sc, |
| 944 | struct iscsi_cmd_task *ctask) |
| 945 | { |
| 946 | struct iscsi_conn *conn = ctask->conn; |
| 947 | struct iscsi_session *session = conn->session; |
| 948 | struct iscsi_tm *hdr = &conn->tmhdr; |
| 949 | int rc; |
| 950 | |
| 951 | /* |
| 952 | * ctask timed out but session is OK requests must be serialized. |
| 953 | */ |
| 954 | memset(hdr, 0, sizeof(struct iscsi_tm)); |
| 955 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; |
| 956 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; |
| 957 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
| 958 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); |
| 959 | hdr->rtt = ctask->hdr->itt; |
| 960 | hdr->refcmdsn = ctask->hdr->cmdsn; |
| 961 | |
| 962 | rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr, |
| 963 | NULL, 0); |
| 964 | if (rc) { |
| 965 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| 966 | debug_scsi("abort sent failure [itt 0x%x] %d", ctask->itt, rc); |
| 967 | return rc; |
| 968 | } |
| 969 | |
| 970 | debug_scsi("abort sent [itt 0x%x]\n", ctask->itt); |
| 971 | |
| 972 | spin_lock_bh(&session->lock); |
| 973 | ctask->mtask = (struct iscsi_mgmt_task *) |
| 974 | session->mgmt_cmds[(hdr->itt & ISCSI_ITT_MASK) - |
| 975 | ISCSI_MGMT_ITT_OFFSET]; |
| 976 | |
| 977 | if (conn->tmabort_state == TMABORT_INITIAL) { |
| 978 | conn->tmfcmd_pdus_cnt++; |
| 979 | conn->tmabort_timer.expires = 10*HZ + jiffies; |
| 980 | conn->tmabort_timer.function = iscsi_tmabort_timedout; |
| 981 | conn->tmabort_timer.data = (unsigned long)ctask; |
| 982 | add_timer(&conn->tmabort_timer); |
| 983 | debug_scsi("abort set timeout [itt 0x%x]", ctask->itt); |
| 984 | } |
| 985 | spin_unlock_bh(&session->lock); |
| 986 | mutex_unlock(&conn->xmitmutex); |
| 987 | |
| 988 | /* |
| 989 | * block eh thread until: |
| 990 | * |
| 991 | * 1) abort response |
| 992 | * 2) abort timeout |
| 993 | * 3) session is terminated or restarted or userspace has |
| 994 | * given up on recovery |
| 995 | */ |
| 996 | wait_event_interruptible(conn->ehwait, |
| 997 | sc->SCp.phase != session->age || |
| 998 | session->state != ISCSI_STATE_LOGGED_IN || |
Mike Christie | 656cffc | 2006-05-18 20:31:42 -0500 | [diff] [blame] | 999 | conn->tmabort_state != TMABORT_INITIAL); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1000 | if (signal_pending(current)) |
| 1001 | flush_signals(current); |
| 1002 | del_timer_sync(&conn->tmabort_timer); |
| 1003 | |
| 1004 | mutex_lock(&conn->xmitmutex); |
| 1005 | return 0; |
| 1006 | } |
| 1007 | |
| 1008 | /* |
| 1009 | * xmit mutex and session lock must be held |
| 1010 | */ |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame] | 1011 | static struct iscsi_mgmt_task * |
| 1012 | iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt) |
| 1013 | { |
| 1014 | int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*); |
| 1015 | struct iscsi_mgmt_task *task; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1016 | |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame] | 1017 | debug_scsi("searching %d tasks\n", nr_tasks); |
| 1018 | |
| 1019 | for (i = 0; i < nr_tasks; i++) { |
| 1020 | __kfifo_get(fifo, (void*)&task, sizeof(void*)); |
| 1021 | debug_scsi("check task %u\n", task->itt); |
| 1022 | |
| 1023 | if (task->itt == itt) { |
| 1024 | debug_scsi("matched task\n"); |
| 1025 | return task; |
| 1026 | } |
| 1027 | |
| 1028 | __kfifo_put(fifo, (void*)&task, sizeof(void*)); |
| 1029 | } |
| 1030 | return NULL; |
| 1031 | } |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1032 | |
| 1033 | static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask) |
| 1034 | { |
| 1035 | struct iscsi_conn *conn = ctask->conn; |
| 1036 | struct iscsi_session *session = conn->session; |
| 1037 | |
| 1038 | if (!ctask->mtask) |
| 1039 | return -EINVAL; |
| 1040 | |
| 1041 | if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt)) |
| 1042 | list_del(&ctask->mtask->running); |
| 1043 | __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask, |
| 1044 | sizeof(void*)); |
| 1045 | ctask->mtask = NULL; |
| 1046 | return 0; |
| 1047 | } |
| 1048 | |
| 1049 | /* |
| 1050 | * session lock and xmitmutex must be held |
| 1051 | */ |
| 1052 | static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, |
| 1053 | int err) |
| 1054 | { |
| 1055 | struct scsi_cmnd *sc; |
| 1056 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1057 | sc = ctask->sc; |
| 1058 | if (!sc) |
| 1059 | return; |
Mike Christie | 7ea8b82 | 2006-07-24 15:47:22 -0500 | [diff] [blame] | 1060 | |
| 1061 | conn->session->tt->cleanup_cmd_task(conn, ctask); |
| 1062 | iscsi_ctask_mtask_cleanup(ctask); |
| 1063 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1064 | sc->result = err; |
| 1065 | sc->resid = sc->request_bufflen; |
| 1066 | iscsi_complete_command(conn->session, ctask); |
| 1067 | } |
| 1068 | |
| 1069 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
| 1070 | { |
| 1071 | struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; |
| 1072 | struct iscsi_conn *conn = ctask->conn; |
| 1073 | struct iscsi_session *session = conn->session; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1074 | int rc; |
| 1075 | |
| 1076 | conn->eh_abort_cnt++; |
| 1077 | debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); |
| 1078 | |
| 1079 | mutex_lock(&conn->xmitmutex); |
| 1080 | spin_lock_bh(&session->lock); |
| 1081 | |
| 1082 | /* |
| 1083 | * If we are not logged in or we have started a new session |
| 1084 | * then let the host reset code handle this |
| 1085 | */ |
| 1086 | if (session->state != ISCSI_STATE_LOGGED_IN || |
| 1087 | sc->SCp.phase != session->age) |
| 1088 | goto failed; |
| 1089 | |
| 1090 | /* ctask completed before time out */ |
Mike Christie | 7ea8b82 | 2006-07-24 15:47:22 -0500 | [diff] [blame] | 1091 | if (!ctask->sc) { |
| 1092 | spin_unlock_bh(&session->lock); |
| 1093 | debug_scsi("sc completed while abort in progress\n"); |
| 1094 | goto success_rel_mutex; |
| 1095 | } |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1096 | |
| 1097 | /* what should we do here ? */ |
| 1098 | if (conn->ctask == ctask) { |
Or Gerlitz | be2df72 | 2006-05-02 19:46:43 -0500 | [diff] [blame] | 1099 | printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. " |
| 1100 | "Failing abort\n", sc, ctask->itt); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1101 | goto failed; |
| 1102 | } |
| 1103 | |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame] | 1104 | if (ctask->state == ISCSI_TASK_PENDING) |
Mike Christie | 7ea8b82 | 2006-07-24 15:47:22 -0500 | [diff] [blame] | 1105 | goto success_cleanup; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1106 | |
| 1107 | conn->tmabort_state = TMABORT_INITIAL; |
| 1108 | |
| 1109 | spin_unlock_bh(&session->lock); |
| 1110 | rc = iscsi_exec_abort_task(sc, ctask); |
| 1111 | spin_lock_bh(&session->lock); |
| 1112 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1113 | if (rc || sc->SCp.phase != session->age || |
| 1114 | session->state != ISCSI_STATE_LOGGED_IN) |
| 1115 | goto failed; |
Mike Christie | 7ea8b82 | 2006-07-24 15:47:22 -0500 | [diff] [blame] | 1116 | iscsi_ctask_mtask_cleanup(ctask); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1117 | |
Mike Christie | 7ea8b82 | 2006-07-24 15:47:22 -0500 | [diff] [blame] | 1118 | switch (conn->tmabort_state) { |
| 1119 | case TMABORT_SUCCESS: |
| 1120 | goto success_cleanup; |
| 1121 | case TMABORT_NOT_FOUND: |
| 1122 | if (!ctask->sc) { |
| 1123 | /* ctask completed before tmf abort response */ |
| 1124 | spin_unlock_bh(&session->lock); |
| 1125 | debug_scsi("sc completed while abort in progress\n"); |
| 1126 | goto success_rel_mutex; |
| 1127 | } |
| 1128 | /* fall through */ |
| 1129 | default: |
| 1130 | /* timedout or failed */ |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1131 | spin_unlock_bh(&session->lock); |
| 1132 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
| 1133 | spin_lock_bh(&session->lock); |
| 1134 | goto failed; |
| 1135 | } |
| 1136 | |
Mike Christie | 7ea8b82 | 2006-07-24 15:47:22 -0500 | [diff] [blame] | 1137 | success_cleanup: |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1138 | debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); |
| 1139 | spin_unlock_bh(&session->lock); |
| 1140 | |
| 1141 | /* |
| 1142 | * clean up task if aborted. we have the xmitmutex so grab |
| 1143 | * the recv lock as a writer |
| 1144 | */ |
| 1145 | write_lock_bh(conn->recv_lock); |
| 1146 | spin_lock(&session->lock); |
| 1147 | fail_command(conn, ctask, DID_ABORT << 16); |
| 1148 | spin_unlock(&session->lock); |
| 1149 | write_unlock_bh(conn->recv_lock); |
| 1150 | |
Mike Christie | 7ea8b82 | 2006-07-24 15:47:22 -0500 | [diff] [blame] | 1151 | success_rel_mutex: |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1152 | mutex_unlock(&conn->xmitmutex); |
| 1153 | return SUCCESS; |
| 1154 | |
| 1155 | failed: |
| 1156 | spin_unlock_bh(&session->lock); |
| 1157 | mutex_unlock(&conn->xmitmutex); |
| 1158 | |
| 1159 | debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); |
| 1160 | return FAILED; |
| 1161 | } |
| 1162 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); |
| 1163 | |
| 1164 | int |
| 1165 | iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) |
| 1166 | { |
| 1167 | int i; |
| 1168 | |
| 1169 | *items = kmalloc(max * sizeof(void*), GFP_KERNEL); |
| 1170 | if (*items == NULL) |
| 1171 | return -ENOMEM; |
| 1172 | |
| 1173 | q->max = max; |
| 1174 | q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL); |
| 1175 | if (q->pool == NULL) { |
| 1176 | kfree(*items); |
| 1177 | return -ENOMEM; |
| 1178 | } |
| 1179 | |
| 1180 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), |
| 1181 | GFP_KERNEL, NULL); |
| 1182 | if (q->queue == ERR_PTR(-ENOMEM)) { |
| 1183 | kfree(q->pool); |
| 1184 | kfree(*items); |
| 1185 | return -ENOMEM; |
| 1186 | } |
| 1187 | |
| 1188 | for (i = 0; i < max; i++) { |
| 1189 | q->pool[i] = kmalloc(item_size, GFP_KERNEL); |
| 1190 | if (q->pool[i] == NULL) { |
| 1191 | int j; |
| 1192 | |
| 1193 | for (j = 0; j < i; j++) |
| 1194 | kfree(q->pool[j]); |
| 1195 | |
| 1196 | kfifo_free(q->queue); |
| 1197 | kfree(q->pool); |
| 1198 | kfree(*items); |
| 1199 | return -ENOMEM; |
| 1200 | } |
| 1201 | memset(q->pool[i], 0, item_size); |
| 1202 | (*items)[i] = q->pool[i]; |
| 1203 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); |
| 1204 | } |
| 1205 | return 0; |
| 1206 | } |
| 1207 | EXPORT_SYMBOL_GPL(iscsi_pool_init); |
| 1208 | |
| 1209 | void iscsi_pool_free(struct iscsi_queue *q, void **items) |
| 1210 | { |
| 1211 | int i; |
| 1212 | |
| 1213 | for (i = 0; i < q->max; i++) |
| 1214 | kfree(items[i]); |
| 1215 | kfree(q->pool); |
| 1216 | kfree(items); |
| 1217 | } |
| 1218 | EXPORT_SYMBOL_GPL(iscsi_pool_free); |
| 1219 | |
| 1220 | /* |
| 1221 | * iSCSI Session's hostdata organization: |
| 1222 | * |
| 1223 | * *------------------* <== hostdata_session(host->hostdata) |
| 1224 | * | ptr to class sess| |
| 1225 | * |------------------| <== iscsi_hostdata(host->hostdata) |
| 1226 | * | iscsi_session | |
| 1227 | * *------------------* |
| 1228 | */ |
| 1229 | |
| 1230 | #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \ |
| 1231 | _sz % sizeof(unsigned long)) |
| 1232 | |
| 1233 | #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) |
| 1234 | |
| 1235 | /** |
| 1236 | * iscsi_session_setup - create iscsi cls session and host and session |
| 1237 | * @scsit: scsi transport template |
| 1238 | * @iscsit: iscsi transport template |
| 1239 | * @initial_cmdsn: initial CmdSN |
| 1240 | * @hostno: host no allocated |
| 1241 | * |
| 1242 | * This can be used by software iscsi_transports that allocate |
| 1243 | * a session per scsi host. |
| 1244 | **/ |
| 1245 | struct iscsi_cls_session * |
| 1246 | iscsi_session_setup(struct iscsi_transport *iscsit, |
| 1247 | struct scsi_transport_template *scsit, |
| 1248 | int cmd_task_size, int mgmt_task_size, |
| 1249 | uint32_t initial_cmdsn, uint32_t *hostno) |
| 1250 | { |
| 1251 | struct Scsi_Host *shost; |
| 1252 | struct iscsi_session *session; |
| 1253 | struct iscsi_cls_session *cls_session; |
| 1254 | int cmd_i; |
| 1255 | |
| 1256 | shost = scsi_host_alloc(iscsit->host_template, |
| 1257 | hostdata_privsize(sizeof(*session))); |
| 1258 | if (!shost) |
| 1259 | return NULL; |
| 1260 | |
| 1261 | shost->max_id = 1; |
| 1262 | shost->max_channel = 0; |
| 1263 | shost->max_lun = iscsit->max_lun; |
| 1264 | shost->max_cmd_len = iscsit->max_cmd_len; |
| 1265 | shost->transportt = scsit; |
| 1266 | shost->transportt->create_work_queue = 1; |
| 1267 | *hostno = shost->host_no; |
| 1268 | |
| 1269 | session = iscsi_hostdata(shost->hostdata); |
| 1270 | memset(session, 0, sizeof(struct iscsi_session)); |
| 1271 | session->host = shost; |
| 1272 | session->state = ISCSI_STATE_FREE; |
| 1273 | session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; |
| 1274 | session->cmds_max = ISCSI_XMIT_CMDS_MAX; |
| 1275 | session->cmdsn = initial_cmdsn; |
| 1276 | session->exp_cmdsn = initial_cmdsn + 1; |
| 1277 | session->max_cmdsn = initial_cmdsn + 1; |
| 1278 | session->max_r2t = 1; |
| 1279 | session->tt = iscsit; |
| 1280 | |
| 1281 | /* initialize SCSI PDU commands pool */ |
| 1282 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, |
| 1283 | (void***)&session->cmds, |
| 1284 | cmd_task_size + sizeof(struct iscsi_cmd_task))) |
| 1285 | goto cmdpool_alloc_fail; |
| 1286 | |
| 1287 | /* pre-format cmds pool with ITT */ |
| 1288 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { |
| 1289 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; |
| 1290 | |
| 1291 | if (cmd_task_size) |
| 1292 | ctask->dd_data = &ctask[1]; |
| 1293 | ctask->itt = cmd_i; |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame] | 1294 | INIT_LIST_HEAD(&ctask->running); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1295 | } |
| 1296 | |
| 1297 | spin_lock_init(&session->lock); |
| 1298 | INIT_LIST_HEAD(&session->connections); |
| 1299 | |
| 1300 | /* initialize immediate command pool */ |
| 1301 | if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, |
| 1302 | (void***)&session->mgmt_cmds, |
| 1303 | mgmt_task_size + sizeof(struct iscsi_mgmt_task))) |
| 1304 | goto mgmtpool_alloc_fail; |
| 1305 | |
| 1306 | |
| 1307 | /* pre-format immediate cmds pool with ITT */ |
| 1308 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { |
| 1309 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; |
| 1310 | |
| 1311 | if (mgmt_task_size) |
| 1312 | mtask->dd_data = &mtask[1]; |
| 1313 | mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame] | 1314 | INIT_LIST_HEAD(&mtask->running); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1315 | } |
| 1316 | |
| 1317 | if (scsi_add_host(shost, NULL)) |
| 1318 | goto add_host_fail; |
| 1319 | |
Mike Christie | f53a88d | 2006-06-28 12:00:27 -0500 | [diff] [blame] | 1320 | if (!try_module_get(iscsit->owner)) |
| 1321 | goto cls_session_fail; |
| 1322 | |
Mike Christie | 6a8a0d3 | 2006-06-28 12:00:31 -0500 | [diff] [blame] | 1323 | cls_session = iscsi_create_session(shost, iscsit, 0); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1324 | if (!cls_session) |
Mike Christie | f53a88d | 2006-06-28 12:00:27 -0500 | [diff] [blame] | 1325 | goto module_put; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1326 | *(unsigned long*)shost->hostdata = (unsigned long)cls_session; |
| 1327 | |
| 1328 | return cls_session; |
| 1329 | |
Mike Christie | f53a88d | 2006-06-28 12:00:27 -0500 | [diff] [blame] | 1330 | module_put: |
| 1331 | module_put(iscsit->owner); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1332 | cls_session_fail: |
| 1333 | scsi_remove_host(shost); |
| 1334 | add_host_fail: |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1335 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); |
| 1336 | mgmtpool_alloc_fail: |
| 1337 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); |
| 1338 | cmdpool_alloc_fail: |
| 1339 | scsi_host_put(shost); |
| 1340 | return NULL; |
| 1341 | } |
| 1342 | EXPORT_SYMBOL_GPL(iscsi_session_setup); |
| 1343 | |
| 1344 | /** |
| 1345 | * iscsi_session_teardown - destroy session, host, and cls_session |
| 1346 | * shost: scsi host |
| 1347 | * |
| 1348 | * This can be used by software iscsi_transports that allocate |
| 1349 | * a session per scsi host. |
| 1350 | **/ |
| 1351 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
| 1352 | { |
| 1353 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
| 1354 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); |
Mike Christie | 63f75cc | 2006-07-24 15:47:29 -0500 | [diff] [blame] | 1355 | struct module *owner = cls_session->transport->owner; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1356 | |
| 1357 | scsi_remove_host(shost); |
| 1358 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1359 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); |
| 1360 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); |
| 1361 | |
Mike Christie | f3ff0c3 | 2006-07-24 15:47:50 -0500 | [diff] [blame] | 1362 | kfree(session->targetname); |
| 1363 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1364 | iscsi_destroy_session(cls_session); |
| 1365 | scsi_host_put(shost); |
Mike Christie | 63f75cc | 2006-07-24 15:47:29 -0500 | [diff] [blame] | 1366 | module_put(owner); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1367 | } |
| 1368 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); |
| 1369 | |
| 1370 | /** |
| 1371 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn |
| 1372 | * @cls_session: iscsi_cls_session |
| 1373 | * @conn_idx: cid |
| 1374 | **/ |
| 1375 | struct iscsi_cls_conn * |
| 1376 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx) |
| 1377 | { |
| 1378 | struct iscsi_session *session = class_to_transport_session(cls_session); |
| 1379 | struct iscsi_conn *conn; |
| 1380 | struct iscsi_cls_conn *cls_conn; |
Mike Christie | d36ab6f | 2006-05-18 20:31:34 -0500 | [diff] [blame] | 1381 | char *data; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1382 | |
| 1383 | cls_conn = iscsi_create_conn(cls_session, conn_idx); |
| 1384 | if (!cls_conn) |
| 1385 | return NULL; |
| 1386 | conn = cls_conn->dd_data; |
| 1387 | memset(conn, 0, sizeof(*conn)); |
| 1388 | |
| 1389 | conn->session = session; |
| 1390 | conn->cls_conn = cls_conn; |
| 1391 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; |
| 1392 | conn->id = conn_idx; |
| 1393 | conn->exp_statsn = 0; |
| 1394 | conn->tmabort_state = TMABORT_INITIAL; |
| 1395 | INIT_LIST_HEAD(&conn->run_list); |
| 1396 | INIT_LIST_HEAD(&conn->mgmt_run_list); |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame] | 1397 | INIT_LIST_HEAD(&conn->xmitqueue); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1398 | |
| 1399 | /* initialize general immediate & non-immediate PDU commands queue */ |
| 1400 | conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), |
| 1401 | GFP_KERNEL, NULL); |
| 1402 | if (conn->immqueue == ERR_PTR(-ENOMEM)) |
| 1403 | goto immqueue_alloc_fail; |
| 1404 | |
| 1405 | conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), |
| 1406 | GFP_KERNEL, NULL); |
| 1407 | if (conn->mgmtqueue == ERR_PTR(-ENOMEM)) |
| 1408 | goto mgmtqueue_alloc_fail; |
| 1409 | |
| 1410 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn); |
| 1411 | |
| 1412 | /* allocate login_mtask used for the login/text sequences */ |
| 1413 | spin_lock_bh(&session->lock); |
| 1414 | if (!__kfifo_get(session->mgmtpool.queue, |
| 1415 | (void*)&conn->login_mtask, |
| 1416 | sizeof(void*))) { |
| 1417 | spin_unlock_bh(&session->lock); |
| 1418 | goto login_mtask_alloc_fail; |
| 1419 | } |
| 1420 | spin_unlock_bh(&session->lock); |
| 1421 | |
Mike Christie | d36ab6f | 2006-05-18 20:31:34 -0500 | [diff] [blame] | 1422 | data = kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL); |
| 1423 | if (!data) |
| 1424 | goto login_mtask_data_alloc_fail; |
Mike Christie | c8dc1e5 | 2006-07-24 15:47:39 -0500 | [diff] [blame] | 1425 | conn->login_mtask->data = conn->data = data; |
Mike Christie | d36ab6f | 2006-05-18 20:31:34 -0500 | [diff] [blame] | 1426 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1427 | init_timer(&conn->tmabort_timer); |
| 1428 | mutex_init(&conn->xmitmutex); |
| 1429 | init_waitqueue_head(&conn->ehwait); |
| 1430 | |
| 1431 | return cls_conn; |
| 1432 | |
Mike Christie | d36ab6f | 2006-05-18 20:31:34 -0500 | [diff] [blame] | 1433 | login_mtask_data_alloc_fail: |
| 1434 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, |
| 1435 | sizeof(void*)); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1436 | login_mtask_alloc_fail: |
| 1437 | kfifo_free(conn->mgmtqueue); |
| 1438 | mgmtqueue_alloc_fail: |
| 1439 | kfifo_free(conn->immqueue); |
| 1440 | immqueue_alloc_fail: |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1441 | iscsi_destroy_conn(cls_conn); |
| 1442 | return NULL; |
| 1443 | } |
| 1444 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); |
| 1445 | |
| 1446 | /** |
| 1447 | * iscsi_conn_teardown - teardown iscsi connection |
| 1448 | * cls_conn: iscsi class connection |
| 1449 | * |
| 1450 | * TODO: we may need to make this into a two step process |
| 1451 | * like scsi-mls remove + put host |
| 1452 | */ |
| 1453 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) |
| 1454 | { |
| 1455 | struct iscsi_conn *conn = cls_conn->dd_data; |
| 1456 | struct iscsi_session *session = conn->session; |
| 1457 | unsigned long flags; |
| 1458 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1459 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
Mike Christie | 67a6111 | 2006-05-30 00:37:20 -0500 | [diff] [blame] | 1460 | mutex_lock(&conn->xmitmutex); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1461 | |
| 1462 | spin_lock_bh(&session->lock); |
| 1463 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; |
| 1464 | if (session->leadconn == conn) { |
| 1465 | /* |
| 1466 | * leading connection? then give up on recovery. |
| 1467 | */ |
| 1468 | session->state = ISCSI_STATE_TERMINATE; |
| 1469 | wake_up(&conn->ehwait); |
| 1470 | } |
| 1471 | spin_unlock_bh(&session->lock); |
| 1472 | |
| 1473 | mutex_unlock(&conn->xmitmutex); |
| 1474 | |
| 1475 | /* |
| 1476 | * Block until all in-progress commands for this connection |
| 1477 | * time out or fail. |
| 1478 | */ |
| 1479 | for (;;) { |
| 1480 | spin_lock_irqsave(session->host->host_lock, flags); |
| 1481 | if (!session->host->host_busy) { /* OK for ERL == 0 */ |
| 1482 | spin_unlock_irqrestore(session->host->host_lock, flags); |
| 1483 | break; |
| 1484 | } |
| 1485 | spin_unlock_irqrestore(session->host->host_lock, flags); |
| 1486 | msleep_interruptible(500); |
Or Gerlitz | be2df72 | 2006-05-02 19:46:43 -0500 | [diff] [blame] | 1487 | printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d " |
| 1488 | "host_failed %d\n", session->host->host_busy, |
| 1489 | session->host->host_failed); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1490 | /* |
| 1491 | * force eh_abort() to unblock |
| 1492 | */ |
| 1493 | wake_up(&conn->ehwait); |
| 1494 | } |
| 1495 | |
| 1496 | spin_lock_bh(&session->lock); |
Mike Christie | c8dc1e5 | 2006-07-24 15:47:39 -0500 | [diff] [blame] | 1497 | kfree(conn->data); |
Mike Christie | f3ff0c3 | 2006-07-24 15:47:50 -0500 | [diff] [blame] | 1498 | kfree(conn->persistent_address); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1499 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, |
| 1500 | sizeof(void*)); |
| 1501 | list_del(&conn->item); |
| 1502 | if (list_empty(&session->connections)) |
| 1503 | session->leadconn = NULL; |
| 1504 | if (session->leadconn && session->leadconn == conn) |
| 1505 | session->leadconn = container_of(session->connections.next, |
| 1506 | struct iscsi_conn, item); |
| 1507 | |
| 1508 | if (session->leadconn == NULL) |
| 1509 | /* no connections exits.. reset sequencing */ |
| 1510 | session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1; |
| 1511 | spin_unlock_bh(&session->lock); |
| 1512 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1513 | kfifo_free(conn->immqueue); |
| 1514 | kfifo_free(conn->mgmtqueue); |
| 1515 | |
| 1516 | iscsi_destroy_conn(cls_conn); |
| 1517 | } |
| 1518 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); |
| 1519 | |
| 1520 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) |
| 1521 | { |
| 1522 | struct iscsi_conn *conn = cls_conn->dd_data; |
| 1523 | struct iscsi_session *session = conn->session; |
| 1524 | |
Mike Christie | ffd0436 | 2006-08-31 18:09:24 -0400 | [diff] [blame^] | 1525 | if (!session) { |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1526 | printk(KERN_ERR "iscsi: can't start unbound connection\n"); |
| 1527 | return -EPERM; |
| 1528 | } |
| 1529 | |
Mike Christie | ffd0436 | 2006-08-31 18:09:24 -0400 | [diff] [blame^] | 1530 | if (session->first_burst > session->max_burst) { |
| 1531 | printk("iscsi: invalid burst lengths: " |
| 1532 | "first_burst %d max_burst %d\n", |
| 1533 | session->first_burst, session->max_burst); |
| 1534 | return -EINVAL; |
| 1535 | } |
| 1536 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1537 | spin_lock_bh(&session->lock); |
| 1538 | conn->c_stage = ISCSI_CONN_STARTED; |
| 1539 | session->state = ISCSI_STATE_LOGGED_IN; |
| 1540 | |
| 1541 | switch(conn->stop_stage) { |
| 1542 | case STOP_CONN_RECOVER: |
| 1543 | /* |
| 1544 | * unblock eh_abort() if it is blocked. re-try all |
| 1545 | * commands after successful recovery |
| 1546 | */ |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1547 | conn->stop_stage = 0; |
| 1548 | conn->tmabort_state = TMABORT_INITIAL; |
| 1549 | session->age++; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1550 | spin_unlock_bh(&session->lock); |
| 1551 | |
| 1552 | iscsi_unblock_session(session_to_cls(session)); |
| 1553 | wake_up(&conn->ehwait); |
| 1554 | return 0; |
| 1555 | case STOP_CONN_TERM: |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1556 | conn->stop_stage = 0; |
| 1557 | break; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1558 | default: |
| 1559 | break; |
| 1560 | } |
| 1561 | spin_unlock_bh(&session->lock); |
| 1562 | |
| 1563 | return 0; |
| 1564 | } |
| 1565 | EXPORT_SYMBOL_GPL(iscsi_conn_start); |
| 1566 | |
| 1567 | static void |
| 1568 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) |
| 1569 | { |
| 1570 | struct iscsi_mgmt_task *mtask, *tmp; |
| 1571 | |
| 1572 | /* handle pending */ |
| 1573 | while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) || |
| 1574 | __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) { |
| 1575 | if (mtask == conn->login_mtask) |
| 1576 | continue; |
| 1577 | debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt); |
| 1578 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, |
| 1579 | sizeof(void*)); |
| 1580 | } |
| 1581 | |
| 1582 | /* handle running */ |
| 1583 | list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) { |
| 1584 | debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt); |
Mike Christie | ed2abc7 | 2006-05-02 19:46:40 -0500 | [diff] [blame] | 1585 | list_del(&mtask->running); |
| 1586 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1587 | if (mtask == conn->login_mtask) |
| 1588 | continue; |
Mike Christie | ed2abc7 | 2006-05-02 19:46:40 -0500 | [diff] [blame] | 1589 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1590 | sizeof(void*)); |
| 1591 | } |
| 1592 | |
| 1593 | conn->mtask = NULL; |
| 1594 | } |
| 1595 | |
| 1596 | /* Fail commands. Mutex and session lock held and recv side suspended */ |
| 1597 | static void fail_all_commands(struct iscsi_conn *conn) |
| 1598 | { |
| 1599 | struct iscsi_cmd_task *ctask, *tmp; |
| 1600 | |
| 1601 | /* flush pending */ |
Mike Christie | b6c395e | 2006-07-24 15:47:15 -0500 | [diff] [blame] | 1602 | list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) { |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1603 | debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc, |
| 1604 | ctask->itt); |
| 1605 | fail_command(conn, ctask, DID_BUS_BUSY << 16); |
| 1606 | } |
| 1607 | |
| 1608 | /* fail all other running */ |
| 1609 | list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { |
| 1610 | debug_scsi("failing in progress sc %p itt 0x%x\n", |
| 1611 | ctask->sc, ctask->itt); |
| 1612 | fail_command(conn, ctask, DID_BUS_BUSY << 16); |
| 1613 | } |
| 1614 | |
| 1615 | conn->ctask = NULL; |
| 1616 | } |
| 1617 | |
Mike Christie | 656cffc | 2006-05-18 20:31:42 -0500 | [diff] [blame] | 1618 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
| 1619 | struct iscsi_conn *conn, int flag) |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1620 | { |
Mike Christie | ed2abc7 | 2006-05-02 19:46:40 -0500 | [diff] [blame] | 1621 | int old_stop_stage; |
| 1622 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1623 | spin_lock_bh(&session->lock); |
Mike Christie | ed2abc7 | 2006-05-02 19:46:40 -0500 | [diff] [blame] | 1624 | if (conn->stop_stage == STOP_CONN_TERM) { |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1625 | spin_unlock_bh(&session->lock); |
| 1626 | return; |
| 1627 | } |
Mike Christie | ed2abc7 | 2006-05-02 19:46:40 -0500 | [diff] [blame] | 1628 | |
| 1629 | /* |
| 1630 | * When this is called for the in_login state, we only want to clean |
Mike Christie | 67a6111 | 2006-05-30 00:37:20 -0500 | [diff] [blame] | 1631 | * up the login task and connection. We do not need to block and set |
| 1632 | * the recovery state again |
Mike Christie | ed2abc7 | 2006-05-02 19:46:40 -0500 | [diff] [blame] | 1633 | */ |
Mike Christie | 67a6111 | 2006-05-30 00:37:20 -0500 | [diff] [blame] | 1634 | if (flag == STOP_CONN_TERM) |
| 1635 | session->state = ISCSI_STATE_TERMINATE; |
| 1636 | else if (conn->stop_stage != STOP_CONN_RECOVER) |
| 1637 | session->state = ISCSI_STATE_IN_RECOVERY; |
Mike Christie | ed2abc7 | 2006-05-02 19:46:40 -0500 | [diff] [blame] | 1638 | |
| 1639 | old_stop_stage = conn->stop_stage; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1640 | conn->stop_stage = flag; |
Mike Christie | 67a6111 | 2006-05-30 00:37:20 -0500 | [diff] [blame] | 1641 | conn->c_stage = ISCSI_CONN_STOPPED; |
| 1642 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1643 | spin_unlock_bh(&session->lock); |
| 1644 | |
Mike Christie | 1c83469 | 2006-07-24 15:47:26 -0500 | [diff] [blame] | 1645 | write_lock_bh(conn->recv_lock); |
| 1646 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); |
| 1647 | write_unlock_bh(conn->recv_lock); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1648 | |
| 1649 | mutex_lock(&conn->xmitmutex); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1650 | /* |
| 1651 | * for connection level recovery we should not calculate |
| 1652 | * header digest. conn->hdr_size used for optimization |
| 1653 | * in hdr_extract() and will be re-negotiated at |
| 1654 | * set_param() time. |
| 1655 | */ |
| 1656 | if (flag == STOP_CONN_RECOVER) { |
| 1657 | conn->hdrdgst_en = 0; |
| 1658 | conn->datadgst_en = 0; |
Mike Christie | 656cffc | 2006-05-18 20:31:42 -0500 | [diff] [blame] | 1659 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
Mike Christie | 67a6111 | 2006-05-30 00:37:20 -0500 | [diff] [blame] | 1660 | old_stop_stage != STOP_CONN_RECOVER) { |
| 1661 | debug_scsi("blocking session\n"); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1662 | iscsi_block_session(session_to_cls(session)); |
Mike Christie | 67a6111 | 2006-05-30 00:37:20 -0500 | [diff] [blame] | 1663 | } |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1664 | } |
Mike Christie | 656cffc | 2006-05-18 20:31:42 -0500 | [diff] [blame] | 1665 | |
Mike Christie | 656cffc | 2006-05-18 20:31:42 -0500 | [diff] [blame] | 1666 | /* |
| 1667 | * flush queues. |
| 1668 | */ |
| 1669 | spin_lock_bh(&session->lock); |
| 1670 | fail_all_commands(conn); |
| 1671 | flush_control_queues(session, conn); |
| 1672 | spin_unlock_bh(&session->lock); |
| 1673 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1674 | mutex_unlock(&conn->xmitmutex); |
| 1675 | } |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1676 | |
| 1677 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
| 1678 | { |
| 1679 | struct iscsi_conn *conn = cls_conn->dd_data; |
| 1680 | struct iscsi_session *session = conn->session; |
| 1681 | |
| 1682 | switch (flag) { |
| 1683 | case STOP_CONN_RECOVER: |
| 1684 | case STOP_CONN_TERM: |
| 1685 | iscsi_start_session_recovery(session, conn, flag); |
Mike Christie | 8d2860b | 2006-05-02 19:46:47 -0500 | [diff] [blame] | 1686 | break; |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1687 | default: |
Or Gerlitz | be2df72 | 2006-05-02 19:46:43 -0500 | [diff] [blame] | 1688 | printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag); |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1689 | } |
| 1690 | } |
| 1691 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); |
| 1692 | |
| 1693 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, |
| 1694 | struct iscsi_cls_conn *cls_conn, int is_leading) |
| 1695 | { |
| 1696 | struct iscsi_session *session = class_to_transport_session(cls_session); |
| 1697 | struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data; |
| 1698 | |
| 1699 | /* lookup for existing connection */ |
| 1700 | spin_lock_bh(&session->lock); |
| 1701 | list_for_each_entry(tmp, &session->connections, item) { |
| 1702 | if (tmp == conn) { |
| 1703 | if (conn->c_stage != ISCSI_CONN_STOPPED || |
| 1704 | conn->stop_stage == STOP_CONN_TERM) { |
Or Gerlitz | be2df72 | 2006-05-02 19:46:43 -0500 | [diff] [blame] | 1705 | printk(KERN_ERR "iscsi: can't bind " |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1706 | "non-stopped connection (%d:%d)\n", |
| 1707 | conn->c_stage, conn->stop_stage); |
| 1708 | spin_unlock_bh(&session->lock); |
| 1709 | return -EIO; |
| 1710 | } |
| 1711 | break; |
| 1712 | } |
| 1713 | } |
| 1714 | if (tmp != conn) { |
| 1715 | /* bind new iSCSI connection to session */ |
| 1716 | conn->session = session; |
| 1717 | list_add(&conn->item, &session->connections); |
| 1718 | } |
| 1719 | spin_unlock_bh(&session->lock); |
| 1720 | |
| 1721 | if (is_leading) |
| 1722 | session->leadconn = conn; |
| 1723 | |
| 1724 | /* |
| 1725 | * Unblock xmitworker(), Login Phase will pass through. |
| 1726 | */ |
| 1727 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); |
| 1728 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
| 1729 | return 0; |
| 1730 | } |
| 1731 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); |
| 1732 | |
Mike Christie | a54a52c | 2006-06-28 12:00:23 -0500 | [diff] [blame] | 1733 | |
| 1734 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, |
| 1735 | enum iscsi_param param, char *buf, int buflen) |
| 1736 | { |
| 1737 | struct iscsi_conn *conn = cls_conn->dd_data; |
| 1738 | struct iscsi_session *session = conn->session; |
| 1739 | uint32_t value; |
| 1740 | |
| 1741 | switch(param) { |
| 1742 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
| 1743 | sscanf(buf, "%d", &conn->max_recv_dlength); |
| 1744 | break; |
| 1745 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: |
| 1746 | sscanf(buf, "%d", &conn->max_xmit_dlength); |
| 1747 | break; |
| 1748 | case ISCSI_PARAM_HDRDGST_EN: |
| 1749 | sscanf(buf, "%d", &conn->hdrdgst_en); |
| 1750 | break; |
| 1751 | case ISCSI_PARAM_DATADGST_EN: |
| 1752 | sscanf(buf, "%d", &conn->datadgst_en); |
| 1753 | break; |
| 1754 | case ISCSI_PARAM_INITIAL_R2T_EN: |
| 1755 | sscanf(buf, "%d", &session->initial_r2t_en); |
| 1756 | break; |
| 1757 | case ISCSI_PARAM_MAX_R2T: |
| 1758 | sscanf(buf, "%d", &session->max_r2t); |
| 1759 | break; |
| 1760 | case ISCSI_PARAM_IMM_DATA_EN: |
| 1761 | sscanf(buf, "%d", &session->imm_data_en); |
| 1762 | break; |
| 1763 | case ISCSI_PARAM_FIRST_BURST: |
| 1764 | sscanf(buf, "%d", &session->first_burst); |
| 1765 | break; |
| 1766 | case ISCSI_PARAM_MAX_BURST: |
| 1767 | sscanf(buf, "%d", &session->max_burst); |
| 1768 | break; |
| 1769 | case ISCSI_PARAM_PDU_INORDER_EN: |
| 1770 | sscanf(buf, "%d", &session->pdu_inorder_en); |
| 1771 | break; |
| 1772 | case ISCSI_PARAM_DATASEQ_INORDER_EN: |
| 1773 | sscanf(buf, "%d", &session->dataseq_inorder_en); |
| 1774 | break; |
| 1775 | case ISCSI_PARAM_ERL: |
| 1776 | sscanf(buf, "%d", &session->erl); |
| 1777 | break; |
| 1778 | case ISCSI_PARAM_IFMARKER_EN: |
| 1779 | sscanf(buf, "%d", &value); |
| 1780 | BUG_ON(value); |
| 1781 | break; |
| 1782 | case ISCSI_PARAM_OFMARKER_EN: |
| 1783 | sscanf(buf, "%d", &value); |
| 1784 | BUG_ON(value); |
| 1785 | break; |
| 1786 | case ISCSI_PARAM_EXP_STATSN: |
| 1787 | sscanf(buf, "%u", &conn->exp_statsn); |
| 1788 | break; |
| 1789 | case ISCSI_PARAM_TARGET_NAME: |
| 1790 | /* this should not change between logins */ |
| 1791 | if (session->targetname) |
| 1792 | break; |
| 1793 | |
| 1794 | session->targetname = kstrdup(buf, GFP_KERNEL); |
| 1795 | if (!session->targetname) |
| 1796 | return -ENOMEM; |
| 1797 | break; |
| 1798 | case ISCSI_PARAM_TPGT: |
| 1799 | sscanf(buf, "%d", &session->tpgt); |
| 1800 | break; |
| 1801 | case ISCSI_PARAM_PERSISTENT_PORT: |
| 1802 | sscanf(buf, "%d", &conn->persistent_port); |
| 1803 | break; |
| 1804 | case ISCSI_PARAM_PERSISTENT_ADDRESS: |
| 1805 | /* |
| 1806 | * this is the address returned in discovery so it should |
| 1807 | * not change between logins. |
| 1808 | */ |
| 1809 | if (conn->persistent_address) |
| 1810 | break; |
| 1811 | |
| 1812 | conn->persistent_address = kstrdup(buf, GFP_KERNEL); |
| 1813 | if (!conn->persistent_address) |
| 1814 | return -ENOMEM; |
| 1815 | break; |
| 1816 | default: |
| 1817 | return -ENOSYS; |
| 1818 | } |
| 1819 | |
| 1820 | return 0; |
| 1821 | } |
| 1822 | EXPORT_SYMBOL_GPL(iscsi_set_param); |
| 1823 | |
| 1824 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, |
| 1825 | enum iscsi_param param, char *buf) |
| 1826 | { |
| 1827 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
| 1828 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); |
| 1829 | int len; |
| 1830 | |
| 1831 | switch(param) { |
| 1832 | case ISCSI_PARAM_INITIAL_R2T_EN: |
| 1833 | len = sprintf(buf, "%d\n", session->initial_r2t_en); |
| 1834 | break; |
| 1835 | case ISCSI_PARAM_MAX_R2T: |
| 1836 | len = sprintf(buf, "%hu\n", session->max_r2t); |
| 1837 | break; |
| 1838 | case ISCSI_PARAM_IMM_DATA_EN: |
| 1839 | len = sprintf(buf, "%d\n", session->imm_data_en); |
| 1840 | break; |
| 1841 | case ISCSI_PARAM_FIRST_BURST: |
| 1842 | len = sprintf(buf, "%u\n", session->first_burst); |
| 1843 | break; |
| 1844 | case ISCSI_PARAM_MAX_BURST: |
| 1845 | len = sprintf(buf, "%u\n", session->max_burst); |
| 1846 | break; |
| 1847 | case ISCSI_PARAM_PDU_INORDER_EN: |
| 1848 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); |
| 1849 | break; |
| 1850 | case ISCSI_PARAM_DATASEQ_INORDER_EN: |
| 1851 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); |
| 1852 | break; |
| 1853 | case ISCSI_PARAM_ERL: |
| 1854 | len = sprintf(buf, "%d\n", session->erl); |
| 1855 | break; |
| 1856 | case ISCSI_PARAM_TARGET_NAME: |
| 1857 | len = sprintf(buf, "%s\n", session->targetname); |
| 1858 | break; |
| 1859 | case ISCSI_PARAM_TPGT: |
| 1860 | len = sprintf(buf, "%d\n", session->tpgt); |
| 1861 | break; |
| 1862 | default: |
| 1863 | return -ENOSYS; |
| 1864 | } |
| 1865 | |
| 1866 | return len; |
| 1867 | } |
| 1868 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); |
| 1869 | |
| 1870 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, |
| 1871 | enum iscsi_param param, char *buf) |
| 1872 | { |
| 1873 | struct iscsi_conn *conn = cls_conn->dd_data; |
| 1874 | int len; |
| 1875 | |
| 1876 | switch(param) { |
| 1877 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
| 1878 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); |
| 1879 | break; |
| 1880 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: |
| 1881 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); |
| 1882 | break; |
| 1883 | case ISCSI_PARAM_HDRDGST_EN: |
| 1884 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); |
| 1885 | break; |
| 1886 | case ISCSI_PARAM_DATADGST_EN: |
| 1887 | len = sprintf(buf, "%d\n", conn->datadgst_en); |
| 1888 | break; |
| 1889 | case ISCSI_PARAM_IFMARKER_EN: |
| 1890 | len = sprintf(buf, "%d\n", conn->ifmarker_en); |
| 1891 | break; |
| 1892 | case ISCSI_PARAM_OFMARKER_EN: |
| 1893 | len = sprintf(buf, "%d\n", conn->ofmarker_en); |
| 1894 | break; |
| 1895 | case ISCSI_PARAM_EXP_STATSN: |
| 1896 | len = sprintf(buf, "%u\n", conn->exp_statsn); |
| 1897 | break; |
| 1898 | case ISCSI_PARAM_PERSISTENT_PORT: |
| 1899 | len = sprintf(buf, "%d\n", conn->persistent_port); |
| 1900 | break; |
| 1901 | case ISCSI_PARAM_PERSISTENT_ADDRESS: |
| 1902 | len = sprintf(buf, "%s\n", conn->persistent_address); |
| 1903 | break; |
| 1904 | default: |
| 1905 | return -ENOSYS; |
| 1906 | } |
| 1907 | |
| 1908 | return len; |
| 1909 | } |
| 1910 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); |
| 1911 | |
Mike Christie | 7996a77 | 2006-04-06 21:13:41 -0500 | [diff] [blame] | 1912 | MODULE_AUTHOR("Mike Christie"); |
| 1913 | MODULE_DESCRIPTION("iSCSI library functions"); |
| 1914 | MODULE_LICENSE("GPL"); |