diff options
Diffstat (limited to 'drivers/scsi/libiscsi.c')
| -rw-r--r-- | drivers/scsi/libiscsi.c | 1091 |
1 files changed, 713 insertions, 378 deletions
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index 8b57af5baae..553168ae44f 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -24,6 +24,7 @@ #include <linux/types.h> #include <linux/kfifo.h> #include <linux/delay.h> +#include <linux/log2.h> #include <asm/unaligned.h> #include <net/tcp.h> #include <scsi/scsi_cmnd.h> @@ -86,7 +87,7 @@ iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) * xmit thread */ if (!list_empty(&session->leadconn->xmitqueue) || - __kfifo_len(session->leadconn->mgmtqueue)) + !list_empty(&session->leadconn->mgmtqueue)) scsi_queue_work(session->host, &session->leadconn->xmitwork); } @@ -122,6 +123,20 @@ void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask, } EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); +static int iscsi_add_hdr(struct iscsi_cmd_task *ctask, unsigned len) +{ + unsigned exp_len = ctask->hdr_len + len; + + if (exp_len > ctask->hdr_max) { + WARN_ON(1); + return -EINVAL; + } + + WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ + ctask->hdr_len = exp_len; + return 0; +} + /** * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu * @ctask: iscsi cmd task @@ -129,27 +144,32 @@ EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set * fields like dlength or final based on how much data it sends */ -static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) +static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) { struct iscsi_conn *conn = ctask->conn; struct iscsi_session *session = conn->session; struct iscsi_cmd *hdr = ctask->hdr; struct scsi_cmnd *sc = ctask->sc; + unsigned hdrlength; + int rc; - hdr->opcode = ISCSI_OP_SCSI_CMD; - hdr->flags = ISCSI_ATTR_SIMPLE; - int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); - hdr->itt = build_itt(ctask->itt, conn->id, session->age); - hdr->data_length = cpu_to_be32(scsi_bufflen(sc)); - hdr->cmdsn = cpu_to_be32(session->cmdsn); - session->cmdsn++; - hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); - memcpy(hdr->cdb, sc->cmnd, sc->cmd_len); + ctask->hdr_len = 0; + rc = iscsi_add_hdr(ctask, sizeof(*hdr)); + if (rc) + return rc; + hdr->opcode = ISCSI_OP_SCSI_CMD; + hdr->flags = ISCSI_ATTR_SIMPLE; + int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); + hdr->itt = build_itt(ctask->itt, conn->id, session->age); + hdr->data_length = cpu_to_be32(scsi_bufflen(sc)); + hdr->cmdsn = cpu_to_be32(session->cmdsn); + session->cmdsn++; + hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); + memcpy(hdr->cdb, sc->cmnd, sc->cmd_len); if (sc->cmd_len < MAX_COMMAND_SIZE) memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len); - ctask->data_count = 0; ctask->imm_count = 0; if (sc->sc_data_direction == DMA_TO_DEVICE) { hdr->flags |= ISCSI_FLAG_CMD_WRITE; @@ -178,9 +198,9 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) else ctask->imm_count = min(scsi_bufflen(sc), conn->max_xmit_dlength); - hton24(ctask->hdr->dlength, ctask->imm_count); + hton24(hdr->dlength, ctask->imm_count); } else - zero_data(ctask->hdr->dlength); + zero_data(hdr->dlength); if (!session->initial_r2t_en) { ctask->unsol_count = min((session->first_burst), @@ -190,7 +210,7 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) if (!ctask->unsol_count) /* No unsolicit Data-Out's */ - ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL; + hdr->flags |= ISCSI_FLAG_CMD_FINAL; } else { hdr->flags |= ISCSI_FLAG_CMD_FINAL; zero_data(hdr->dlength); @@ -199,13 +219,25 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) hdr->flags |= ISCSI_FLAG_CMD_READ; } - conn->scsicmd_pdus_cnt++; + /* calculate size of additional header segments (AHSs) */ + hdrlength = ctask->hdr_len - sizeof(*hdr); + + WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); + hdrlength /= ISCSI_PAD_LEN; + + WARN_ON(hdrlength >= 256); + hdr->hlength = hdrlength & 0xFF; + + if (conn->session->tt->init_cmd_task(conn->ctask)) + return EIO; - debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d " + conn->scsicmd_pdus_cnt++; + debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d " "cmdsn %d win %d]\n", - sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", + sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc), - session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); + session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); + return 0; } /** @@ -218,13 +250,16 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) */ static void iscsi_complete_command(struct iscsi_cmd_task *ctask) { - struct iscsi_session *session = ctask->conn->session; + struct iscsi_conn *conn = ctask->conn; + struct iscsi_session *session = conn->session; struct scsi_cmnd *sc = ctask->sc; ctask->state = ISCSI_TASK_COMPLETED; ctask->sc = NULL; /* SCSI eh reuses commands to verify us */ sc->SCp.ptr = NULL; + if (conn->ctask == ctask) + conn->ctask = NULL; list_del_init(&ctask->running); __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); sc->scsi_done(sc); @@ -241,6 +276,112 @@ static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask) iscsi_complete_command(ctask); } +/* + * session lock must be held + */ +static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, + int err) +{ + struct scsi_cmnd *sc; + + sc = ctask->sc; + if (!sc) + return; + + if (ctask->state == ISCSI_TASK_PENDING) + /* + * cmd never made it to the xmit thread, so we should not count + * the cmd in the sequencing + */ + conn->session->queued_cmdsn--; + else + conn->session->tt->cleanup_cmd_task(conn, ctask); + + sc->result = err; + scsi_set_resid(sc, scsi_bufflen(sc)); + if (conn->ctask == ctask) + conn->ctask = NULL; + /* release ref from queuecommand */ + __iscsi_put_ctask(ctask); +} + +/** + * iscsi_free_mgmt_task - return mgmt task back to pool + * @conn: iscsi connection + * @mtask: mtask + * + * Must be called with session lock. + */ +void iscsi_free_mgmt_task(struct iscsi_conn *conn, + struct iscsi_mgmt_task *mtask) +{ + list_del_init(&mtask->running); + if (conn->login_mtask == mtask) + return; + + if (conn->ping_mtask == mtask) + conn->ping_mtask = NULL; + __kfifo_put(conn->session->mgmtpool.queue, + (void*)&mtask, sizeof(void*)); +} +EXPORT_SYMBOL_GPL(iscsi_free_mgmt_task); + +static struct iscsi_mgmt_task * +__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, + char *data, uint32_t data_size) +{ + struct iscsi_session *session = conn->session; + struct iscsi_mgmt_task *mtask; + + if (session->state == ISCSI_STATE_TERMINATE) + return NULL; + + if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || + hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) + /* + * Login and Text are sent serially, in + * request-followed-by-response sequence. + * Same mtask can be used. Same ITT must be used. + * Note that login_mtask is preallocated at conn_create(). + */ + mtask = conn->login_mtask; + else { + BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); + BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); + + if (!__kfifo_get(session->mgmtpool.queue, + (void*)&mtask, sizeof(void*))) + return NULL; + } + + if (data_size) { + memcpy(mtask->data, data, data_size); + mtask->data_count = data_size; + } else + mtask->data_count = 0; + + memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr)); + INIT_LIST_HEAD(&mtask->running); + list_add_tail(&mtask->running, &conn->mgmtqueue); + return mtask; +} + +int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, + char *data, uint32_t data_size) +{ + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_session *session = conn->session; + int err = 0; + + spin_lock_bh(&session->lock); + if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) + err = -EPERM; + spin_unlock_bh(&session->lock); + scsi_queue_work(session->host, &conn->xmitwork); + return err; +} +EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); + /** * iscsi_cmd_rsp - SCSI Command Response processing * @conn: iscsi connection @@ -291,17 +432,19 @@ invalid_datalen: min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); } - if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { + if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | + ISCSI_FLAG_CMD_OVERFLOW)) { int res_count = be32_to_cpu(rhdr->residual_count); - if (res_count > 0 && res_count <= scsi_bufflen(sc)) + if (res_count > 0 && + (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || + res_count <= scsi_bufflen(sc))) scsi_set_resid(sc, res_count); else sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; - } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) + } else if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | + ISCSI_FLAG_CMD_BIDI_OVERFLOW)) sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; - else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) - scsi_set_resid(sc, be32_to_cpu(rhdr->residual_count)); out: debug_scsi("done [sc %lx res %d itt 0x%x]\n", @@ -318,18 +461,51 @@ static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; conn->tmfrsp_pdus_cnt++; - if (conn->tmabort_state != TMABORT_INITIAL) + if (conn->tmf_state != TMF_QUEUED) return; if (tmf->response == ISCSI_TMF_RSP_COMPLETE) - conn->tmabort_state = TMABORT_SUCCESS; + conn->tmf_state = TMF_SUCCESS; else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) - conn->tmabort_state = TMABORT_NOT_FOUND; + conn->tmf_state = TMF_NOT_FOUND; else - conn->tmabort_state = TMABORT_FAILED; + conn->tmf_state = TMF_FAILED; wake_up(&conn->ehwait); } +static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) +{ + struct iscsi_nopout hdr; + struct iscsi_mgmt_task *mtask; + + if (!rhdr && conn->ping_mtask) + return; + + memset(&hdr, 0, sizeof(struct iscsi_nopout)); + hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; + hdr.flags = ISCSI_FLAG_CMD_FINAL; + + if (rhdr) { + memcpy(hdr.lun, rhdr->lun, 8); + hdr.ttt = rhdr->ttt; + hdr.itt = RESERVED_ITT; + } else + hdr.ttt = RESERVED_ITT; + + mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); + if (!mtask) { + printk(KERN_ERR "Could not send nopout\n"); + return; + } + + /* only track our nops */ + if (!rhdr) { + conn->ping_mtask = mtask; + conn->last_ping = jiffies; + } + scsi_queue_work(conn->session->host, &conn->xmitwork); +} + static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, char *data, int datalen) { @@ -374,6 +550,7 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, struct iscsi_mgmt_task *mtask; uint32_t itt; + conn->last_recv = jiffies; if (hdr->itt != RESERVED_ITT) itt = get_itt(hdr->itt); else @@ -429,10 +606,7 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, */ if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) rc = ISCSI_ERR_CONN_FAILED; - list_del(&mtask->running); - if (conn->login_mtask != mtask) - __kfifo_put(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*)); + iscsi_free_mgmt_task(conn, mtask); break; case ISCSI_OP_SCSI_TMFUNC_RSP: if (datalen) { @@ -441,20 +615,26 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, } iscsi_tmf_rsp(conn, hdr); + iscsi_free_mgmt_task(conn, mtask); break; case ISCSI_OP_NOOP_IN: - if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { + if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || + datalen) { rc = ISCSI_ERR_PROTO; break; } conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; - if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) - rc = ISCSI_ERR_CONN_FAILED; - list_del(&mtask->running); - if (conn->login_mtask != mtask) - __kfifo_put(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*)); + if (conn->ping_mtask != mtask) { + /* + * If this is not in response to one of our + * nops then it must be from userspace. + */ + if (iscsi_recv_pdu(conn->cls_conn, hdr, data, + datalen)) + rc = ISCSI_ERR_CONN_FAILED; + } + iscsi_free_mgmt_task(conn, mtask); break; default: rc = ISCSI_ERR_BAD_OPCODE; @@ -473,8 +653,7 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) break; - if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0)) - rc = ISCSI_ERR_CONN_FAILED; + iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); break; case ISCSI_OP_REJECT: rc = iscsi_handle_reject(conn, hdr, data, datalen); @@ -609,20 +788,19 @@ static void iscsi_prep_mtask(struct iscsi_conn *conn, session->tt->init_mgmt_task(conn, mtask); debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", - hdr->opcode, hdr->itt, mtask->data_count); + hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt, + mtask->data_count); } static int iscsi_xmit_mtask(struct iscsi_conn *conn) { struct iscsi_hdr *hdr = conn->mtask->hdr; - int rc, was_logout = 0; + int rc; + if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) + conn->session->state = ISCSI_STATE_LOGGING_OUT; spin_unlock_bh(&conn->session->lock); - if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) { - conn->session->state = ISCSI_STATE_IN_RECOVERY; - iscsi_block_session(session_to_cls(conn->session)); - was_logout = 1; - } + rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask); spin_lock_bh(&conn->session->lock); if (rc) @@ -630,11 +808,6 @@ static int iscsi_xmit_mtask(struct iscsi_conn *conn) /* done with this in-progress mtask */ conn->mtask = NULL; - - if (was_logout) { - set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); - return -ENODATA; - } return 0; } @@ -658,21 +831,13 @@ static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) static int iscsi_xmit_ctask(struct iscsi_conn *conn) { struct iscsi_cmd_task *ctask = conn->ctask; - int rc = 0; - - /* - * serialize with TMF AbortTask - */ - if (ctask->state == ISCSI_TASK_ABORTING) - goto done; + int rc; __iscsi_get_ctask(ctask); spin_unlock_bh(&conn->session->lock); rc = conn->session->tt->xmit_cmd_task(conn, ctask); spin_lock_bh(&conn->session->lock); __iscsi_put_ctask(ctask); - -done: if (!rc) /* done with this ctask */ conn->ctask = NULL; @@ -680,6 +845,22 @@ done: } /** + * iscsi_requeue_ctask - requeue ctask to run from session workqueue + * @ctask: ctask to requeue + * + * LLDs that need to run a ctask from the session workqueue should call + * this. The session lock must be held. + */ +void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask) +{ + struct iscsi_conn *conn = ctask->conn; + + list_move_tail(&ctask->running, &conn->requeue); + scsi_queue_work(conn->session->host, &conn->xmitwork); +} +EXPORT_SYMBOL_GPL(iscsi_requeue_ctask); + +/** * iscsi_data_xmit - xmit any command into the scheduled connection * @conn: iscsi connection * @@ -717,36 +898,40 @@ static int iscsi_data_xmit(struct iscsi_conn *conn) * overflow us with nop-ins */ check_mgmt: - while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask, - sizeof(void*))) { + while (!list_empty(&conn->mgmtqueue)) { + conn->mtask = list_entry(conn->mgmtqueue.next, + struct iscsi_mgmt_task, running); + if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { + iscsi_free_mgmt_task(conn, conn->mtask); + conn->mtask = NULL; + continue; + } + iscsi_prep_mtask(conn, conn->mtask); - list_add_tail(&conn->mtask->running, &conn->mgmt_run_list); + list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list); rc = iscsi_xmit_mtask(conn); if (rc) goto again; } - /* process command queue */ + /* process pending command queue */ while (!list_empty(&conn->xmitqueue)) { - /* - * iscsi tcp may readd the task to the xmitqueue to send - * write data - */ + if (conn->tmf_state == TMF_QUEUED) + break; + conn->ctask = list_entry(conn->xmitqueue.next, struct iscsi_cmd_task, running); - switch (conn->ctask->state) { - case ISCSI_TASK_ABORTING: - break; - case ISCSI_TASK_PENDING: - iscsi_prep_scsi_cmd_pdu(conn->ctask); - conn->session->tt->init_cmd_task(conn->ctask); - /* fall through */ - default: - conn->ctask->state = ISCSI_TASK_RUNNING; - break; + if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { + fail_command(conn, conn->ctask, DID_IMM_RETRY << 16); + continue; + } + if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) { + fail_command(conn, conn->ctask, DID_ABORT << 16); + continue; } - list_move_tail(conn->xmitqueue.next, &conn->run_list); + conn->ctask->state = ISCSI_TASK_RUNNING; + list_move_tail(conn->xmitqueue.next, &conn->run_list); rc = iscsi_xmit_ctask(conn); if (rc) goto again; @@ -755,7 +940,28 @@ check_mgmt: * we need to check the mgmt queue for nops that need to * be sent to aviod starvation */ - if (__kfifo_len(conn->mgmtqueue)) + if (!list_empty(&conn->mgmtqueue)) + goto check_mgmt; + } + + while (!list_empty(&conn->requeue)) { + if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL) + break; + + /* + * we always do fastlogout - conn stop code will clean up. + */ + if (conn->session->state == ISCSI_STATE_LOGGING_OUT) + break; + + conn->ctask = list_entry(conn->requeue.next, + struct iscsi_cmd_task, running); + conn->ctask->state = ISCSI_TASK_RUNNING; + list_move_tail(conn->requeue.next, &conn->run_list); + rc = iscsi_xmit_ctask(conn); + if (rc) + goto again; + if (!list_empty(&conn->mgmtqueue)) goto check_mgmt; } spin_unlock_bh(&conn->session->lock); @@ -790,6 +996,7 @@ enum { FAILURE_SESSION_TERMINATE, FAILURE_SESSION_IN_RECOVERY, FAILURE_SESSION_RECOVERY_TIMEOUT, + FAILURE_SESSION_LOGGING_OUT, }; int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) @@ -805,8 +1012,9 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) sc->SCp.ptr = NULL; host = sc->device->host; - session = iscsi_hostdata(host->hostdata); + spin_unlock(host->host_lock); + session = iscsi_hostdata(host->hostdata); spin_lock(&session->lock); /* @@ -822,17 +1030,22 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) * be entering our queuecommand while a block is starting * up because the block code is not locked) */ - if (session->state == ISCSI_STATE_IN_RECOVERY) { + switch (session->state) { + case ISCSI_STATE_IN_RECOVERY: reason = FAILURE_SESSION_IN_RECOVERY; goto reject; - } - - if (session->state == ISCSI_STATE_RECOVERY_FAILED) + case ISCSI_STATE_LOGGING_OUT: + reason = FAILURE_SESSION_LOGGING_OUT; + goto reject; + case ISCSI_STATE_RECOVERY_FAILED: reason = FAILURE_SESSION_RECOVERY_TIMEOUT; - else if (session->state == ISCSI_STATE_TERMINATE) + break; + case ISCSI_STATE_TERMINATE: reason = FAILURE_SESSION_TERMINATE; - else + break; + default: reason = FAILURE_SESSION_FREED; + } goto fault; } @@ -859,7 +1072,6 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) atomic_set(&ctask->refcount, 1); ctask->state = ISCSI_TASK_PENDING; - ctask->mtask = NULL; ctask->conn = conn; ctask->sc = sc; INIT_LIST_HEAD(&ctask->running); @@ -868,11 +1080,13 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) spin_unlock(&session->lock); scsi_queue_work(host, &conn->xmitwork); + spin_lock(host->host_lock); return 0; reject: spin_unlock(&session->lock); debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); + spin_lock(host->host_lock); return SCSI_MLQUEUE_HOST_BUSY; fault: @@ -882,6 +1096,7 @@ fault: sc->result = (DID_NO_CONNECT << 16); scsi_set_resid(sc, scsi_bufflen(sc)); sc->scsi_done(sc); + spin_lock(host->host_lock); return 0; } EXPORT_SYMBOL_GPL(iscsi_queuecommand); @@ -895,72 +1110,15 @@ int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) } EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); -static struct iscsi_mgmt_task * -__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, - char *data, uint32_t data_size) -{ - struct iscsi_session *session = conn->session; - struct iscsi_mgmt_task *mtask; - - if (session->state == ISCSI_STATE_TERMINATE) - return NULL; - - if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || - hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) - /* - * Login and Text are sent serially, in - * request-followed-by-response sequence. - * Same mtask can be used. Same ITT must be used. - * Note that login_mtask is preallocated at conn_create(). - */ - mtask = conn->login_mtask; - else { - BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); - BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); - - if (!__kfifo_get(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*))) - return NULL; - } - - if (data_size) { - memcpy(mtask->data, data, data_size); - mtask->data_count = data_size; - } else - mtask->data_count = 0; - - INIT_LIST_HEAD(&mtask->running); - memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr)); - __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*)); - return mtask; -} - -int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, - char *data, uint32_t data_size) -{ - struct iscsi_conn *conn = cls_conn->dd_data; - struct iscsi_session *session = conn->session; - int err = 0; - - spin_lock_bh(&session->lock); - if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) - err = -EPERM; - spin_unlock_bh(&session->lock); - scsi_queue_work(session->host, &conn->xmitwork); - return err; -} -EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); - void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) { struct iscsi_session *session = class_to_transport_session(cls_session); - struct iscsi_conn *conn = session->leadconn; spin_lock_bh(&session->lock); if (session->state != ISCSI_STATE_LOGGED_IN) { session->state = ISCSI_STATE_RECOVERY_FAILED; - if (conn) - wake_up(&conn->ehwait); + if (session->leadconn) + wake_up(&session->leadconn->ehwait); } spin_unlock_bh(&session->lock); } @@ -971,30 +1129,25 @@ int iscsi_eh_host_reset(struct scsi_cmnd *sc) struct Scsi_Host *host = sc->device->host; struct iscsi_session *session = iscsi_hostdata(host->hostdata); struct iscsi_conn *conn = session->leadconn; - int fail_session = 0; + mutex_lock(&session->eh_mutex); spin_lock_bh(&session->lock); if (session->state == ISCSI_STATE_TERMINATE) { failed: debug_scsi("failing host reset: session terminated " "[CID %d age %d]\n", conn->id, session->age); spin_unlock_bh(&session->lock); + mutex_unlock(&session->eh_mutex); return FAILED; } - if (sc->SCp.phase == session->age) { - debug_scsi("failing connection CID %d due to SCSI host reset\n", - conn->id); - fail_session = 1; - } spin_unlock_bh(&session->lock); - + mutex_unlock(&session->eh_mutex); /* * we drop the lock here but the leadconn cannot be destoyed while * we are in the scsi eh */ - if (fail_session) - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); debug_scsi("iscsi_eh_host_reset wait for relogin\n"); wait_event_interruptible(conn->ehwait, @@ -1004,73 +1157,56 @@ failed: if (signal_pending(current)) flush_signals(current); + mutex_lock(&session->eh_mutex); spin_lock_bh(&session->lock); if (session->state == ISCSI_STATE_LOGGED_IN) printk(KERN_INFO "iscsi: host reset succeeded\n"); else goto failed; spin_unlock_bh(&session->lock); - + mutex_unlock(&session->eh_mutex); return SUCCESS; } EXPORT_SYMBOL_GPL(iscsi_eh_host_reset); -static void iscsi_tmabort_timedout(unsigned long data) +static void iscsi_tmf_timedout(unsigned long data) { - struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data; - struct iscsi_conn *conn = ctask->conn; + struct iscsi_conn *conn = (struct iscsi_conn *)data; struct iscsi_session *session = conn->session; spin_lock(&session->lock); - if (conn->tmabort_state == TMABORT_INITIAL) { - conn->tmabort_state = TMABORT_TIMEDOUT; - debug_scsi("tmabort timedout [sc %p itt 0x%x]\n", - ctask->sc, ctask->itt); + if (conn->tmf_state == TMF_QUEUED) { + conn->tmf_state = TMF_TIMEDOUT; + debug_scsi("tmf timedout\n"); /* unblock eh_abort() */ wake_up(&conn->ehwait); } spin_unlock(&session->lock); } -static int iscsi_exec_abort_task(struct scsi_cmnd *sc, - struct iscsi_cmd_task *ctask) +static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, + struct iscsi_tm *hdr, int age, + int timeout) { - struct iscsi_conn *conn = ctask->conn; struct iscsi_session *session = conn->session; - struct iscsi_tm *hdr = &conn->tmhdr; - - /* - * ctask timed out but session is OK requests must be serialized. - */ - memset(hdr, 0, sizeof(struct iscsi_tm)); - hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; - hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; - hdr->flags |= ISCSI_FLAG_CMD_FINAL; - memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); - hdr->rtt = ctask->hdr->itt; - hdr->refcmdsn = ctask->hdr->cmdsn; + struct iscsi_mgmt_task *mtask; - ctask->mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, - NULL, 0); - if (!ctask->mtask) { + mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, + NULL, 0); + if (!mtask) { spin_unlock_bh(&session->lock); iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - spin_lock_bh(&session->lock) - debug_scsi("abort sent failure [itt 0x%x]\n", ctask->itt); + spin_lock_bh(&session->lock); + debug_scsi("tmf exec failure\n"); return -EPERM; } - ctask->state = ISCSI_TASK_ABORTING; + conn->tmfcmd_pdus_cnt++; + conn->tmf_timer.expires = timeout * HZ + jiffies; + conn->tmf_timer.function = iscsi_tmf_timedout; + conn->tmf_timer.data = (unsigned long)conn; + add_timer(&conn->tmf_timer); + debug_scsi("tmf set timeout\n"); - debug_scsi("abort sent [itt 0x%x]\n", ctask->itt); - - if (conn->tmabort_state == TMABORT_INITIAL) { - conn->tmfcmd_pdus_cnt++; - conn->tmabort_timer.expires = 20*HZ + jiffies; - conn->tmabort_timer.function = iscsi_tmabort_timedout; - conn->tmabort_timer.data = (unsigned long)ctask; - add_timer(&conn->tmabort_timer); - debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt); - } spin_unlock_bh(&session->lock); mutex_unlock(&session->eh_mutex); scsi_queue_work(session->host, &conn->xmitwork); @@ -1078,113 +1214,197 @@ static int iscsi_exec_abort_task(struct scsi_cmnd *sc, /* * block eh thread until: * - * 1) abort response - * 2) abort timeout + * 1) tmf response + * 2) tmf timeout * 3) session is terminated or restarted or userspace has * given up on recovery */ - wait_event_interruptible(conn->ehwait, - sc->SCp.phase != session->age || + wait_event_interruptible(conn->ehwait, age != session->age || session->state != ISCSI_STATE_LOGGED_IN || - conn->tmabort_state != TMABORT_INITIAL); + conn->tmf_state != TMF_QUEUED); if (signal_pending(current)) flush_signals(current); - del_timer_sync(&conn->tmabort_timer); + del_timer_sync(&conn->tmf_timer); + mutex_lock(&session->eh_mutex); spin_lock_bh(&session->lock); + /* if the session drops it will clean up the mtask */ + if (age != session->age || + session->state != ISCSI_STATE_LOGGED_IN) + return -ENOTCONN; return 0; } /* - * session lock must be held + * Fail commands. session lock held and recv side suspended and xmit + * thread flushed */ -static struct iscsi_mgmt_task * -iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt) +static void fail_all_commands(struct iscsi_conn *conn, unsigned lun) { - int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*); - struct iscsi_mgmt_task *task; + struct iscsi_cmd_task *ctask, *tmp; - debug_scsi("searching %d tasks\n", nr_tasks); + if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1)) + conn->ctask = NULL; - for (i = 0; i < nr_tasks; i++) { - __kfifo_get(fifo, (void*)&task, sizeof(void*)); - debug_scsi("check task %u\n", task->itt); + /* flush pending */ + list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) { + if (lun == ctask->sc->device->lun || lun == -1) { + debug_scsi("failing pending sc %p itt 0x%x\n", + ctask->sc, ctask->itt); + fail_command(conn, ctask, DID_BUS_BUSY << 16); + } + } - if (task->itt == itt) { - debug_scsi("matched task\n"); - return task; + list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) { + if (lun == ctask->sc->device->lun || lun == -1) { + debug_scsi("failing requeued sc %p itt 0x%x\n", + ctask->sc, ctask->itt); + fail_command(conn, ctask, DID_BUS_BUSY << 16); } + } - __kfifo_put(fifo, (void*)&task, sizeof(void*)); + /* fail all other running */ + list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { + if (lun == ctask->sc->device->lun || lun == -1) { + debug_scsi("failing in progress sc %p itt 0x%x\n", + ctask->sc, ctask->itt); + fail_command(conn, ctask, DID_BUS_BUSY << 16); + } } - return NULL; } -static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask) +static void iscsi_suspend_tx(struct iscsi_conn *conn) { - struct iscsi_conn *conn = ctask->conn; - struct iscsi_session *session = conn->session; - - if (!ctask->mtask) - return -EINVAL; + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + scsi_flush_work(conn->session->host); +} - if (!iscsi_remove_mgmt_task(conn->mgmtqueue, ctask->mtask->itt)) - list_del(&ctask->mtask->running); - __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask, - sizeof(void*)); - ctask->mtask = NULL; - return 0; +static void iscsi_start_tx(struct iscsi_conn *conn) +{ + clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + scsi_queue_work(conn->session->host, &conn->xmitwork); } -/* - * session lock must be held - */ -static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, - int err) +static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd) { - struct scsi_cmnd *sc; + struct iscsi_cls_session *cls_session; + struct iscsi_session *session; + struct iscsi_conn *conn; + enum scsi_eh_timer_return rc = EH_NOT_HANDLED; - sc = ctask->sc; - if (!sc) - return; + cls_session = starget_to_session(scsi_target(scmd->device)); + session = class_to_transport_session(cls_session); - if (ctask->state == ISCSI_TASK_PENDING) + debug_scsi("scsi cmd %p timedout\n", scmd); + + spin_lock(&session->lock); + if (session->state != ISCSI_STATE_LOGGED_IN) { /* - * cmd never made it to the xmit thread, so we should not count - * the cmd in the sequencing + * We are probably in the middle of iscsi recovery so let + * that complete and handle the error. */ - conn->session->queued_cmdsn--; - else - conn->session->tt->cleanup_cmd_task(conn, ctask); - iscsi_ctask_mtask_cleanup(ctask); + rc = EH_RESET_TIMER; + goto done; + } - sc->result = err; - scsi_set_resid(sc, scsi_bufflen(sc)); - if (conn->ctask == ctask) - conn->ctask = NULL; - /* release ref from queuecommand */ - __iscsi_put_ctask(ctask); + conn = session->leadconn; + if (!conn) { + /* In the middle of shuting down */ + rc = EH_RESET_TIMER; + goto done; + } + + if (!conn->recv_timeout && !conn->ping_timeout) + goto done; + /* + * if the ping timedout then we are in the middle of cleaning up + * and can let the iscsi eh handle it + */ + if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + + (conn->ping_timeout * HZ), jiffies)) + rc = EH_RESET_TIMER; + /* + * if we are about to check the transport then give the command + * more time + */ + if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ), + jiffies)) + rc = EH_RESET_TIMER; + /* if in the middle of checking the transport then give us more time */ + if (conn->ping_mtask) + rc = EH_RESET_TIMER; +done: + spin_unlock(&session->lock); + debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh"); + return rc; } -static void iscsi_suspend_tx(struct iscsi_conn *conn) +static void iscsi_check_transport_timeouts(unsigned long data) { - set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); - scsi_flush_work(conn->session->host); + struct iscsi_conn *conn = (struct iscsi_conn *)data; + struct iscsi_session *session = conn->session; + unsigned long timeout, next_timeout = 0, last_recv; + + spin_lock(&session->lock); + if (session->state != ISCSI_STATE_LOGGED_IN) + goto done; + + timeout = conn->recv_timeout; + if (!timeout) + goto done; + + timeout *= HZ; + last_recv = conn->last_recv; + if (time_before_eq(last_recv + timeout + (conn->ping_timeout * HZ), + jiffies)) { + printk(KERN_ERR "ping timeout of %d secs expired, " + "last rx %lu, last ping %lu, now %lu\n", + conn->ping_timeout, last_recv, + conn->last_ping, jiffies); + spin_unlock(&session->lock); + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + return; + } + + if (time_before_eq(last_recv + timeout, jiffies)) { + if (time_before_eq(conn->last_ping, last_recv)) { + /* send a ping to try to provoke some traffic */ + debug_scsi("Sending nopout as ping on conn %p\n", conn); + iscsi_send_nopout(conn, NULL); + } + next_timeout = last_recv + timeout + (conn->ping_timeout * HZ); + } else { + next_timeout = last_recv + timeout; + } + + if (next_timeout) { + debug_scsi("Setting next tmo %lu\n", next_timeout); + mod_timer(&conn->transport_timer, next_timeout); + } +done: + spin_unlock(&session->lock); } -static void iscsi_start_tx(struct iscsi_conn *conn) +static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask, + struct iscsi_tm *hdr) { - clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); - scsi_queue_work(conn->session->host, &conn->xmitwork); + memset(hdr, 0, sizeof(*hdr)); + hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; + hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); + hdr->rtt = ctask->hdr->itt; + hdr->refcmdsn = ctask->hdr->cmdsn; } int iscsi_eh_abort(struct scsi_cmnd *sc) { struct Scsi_Host *host = sc->device->host; struct iscsi_session *session = iscsi_hostdata(host->hostdata); - struct iscsi_cmd_task *ctask; struct iscsi_conn *conn; - int rc; + struct iscsi_cmd_task *ctask; + struct iscsi_tm *hdr; + int rc, age; mutex_lock(&session->eh_mutex); spin_lock_bh(&session->lock); @@ -1199,19 +1419,23 @@ int iscsi_eh_abort(struct scsi_cmnd *sc) return SUCCESS; } - ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; - conn = ctask->conn; - - conn->eh_abort_cnt++; - debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); - /* * If we are not logged in or we have started a new session * then let the host reset code handle this */ - if (session->state != ISCSI_STATE_LOGGED_IN || - sc->SCp.phase != session->age) - goto failed; + if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || + sc->SCp.phase != session->age) { + spin_unlock_bh(&session->lock); + mutex_unlock(&session->eh_mutex); + return FAILED; + } + + conn = session->leadconn; + conn->eh_abort_cnt++; + age = session->age; + + ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; + debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); /* ctask completed before time out */ if (!ctask->sc) { @@ -1219,27 +1443,26 @@ int iscsi_eh_abort(struct scsi_cmnd *sc) goto success; } - /* what should we do here ? */ - if (conn->ctask == ctask) { - printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. " - "Failing abort\n", sc, ctask->itt); - goto failed; - } - if (ctask->state == ISCSI_TASK_PENDING) { fail_command(conn, ctask, DID_ABORT << 16); goto success; } - conn->tmabort_state = TMABORT_INITIAL; - rc = iscsi_exec_abort_task(sc, ctask); - if (rc || sc->SCp.phase != session->age || - session->state != ISCSI_STATE_LOGGED_IN) + /* only have one tmf outstanding at a time */ + if (conn->tmf_state != TMF_INITIAL) + goto failed; + conn->tmf_state = TMF_QUEUED; + + hdr = &conn->tmhdr; + iscsi_prep_abort_task_pdu(ctask, hdr); + + if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { + rc = FAILED; goto failed; - iscsi_ctask_mtask_cleanup(ctask); + } - switch (conn->tmabort_state) { - case TMABORT_SUCCESS: + switch (conn->tmf_state) { + case TMF_SUCCESS: spin_unlock_bh(&session->lock); iscsi_suspend_tx(conn); /* @@ -1248,22 +1471,26 @@ int iscsi_eh_abort(struct scsi_cmnd *sc) write_lock_bh(conn->recv_lock); spin_lock(&session->lock); fail_command(conn, ctask, DID_ABORT << 16); + conn->tmf_state = TMF_INITIAL; spin_unlock(&session->lock); write_unlock_bh(conn->recv_lock); iscsi_start_tx(conn); goto success_unlocked; - case TMABORT_NOT_FOUND: - if (!ctask->sc) { + case TMF_TIMEDOUT: + spin_unlock_bh(&session->lock); + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + goto failed_unlocked; + case TMF_NOT_FOUND: + if (!sc->SCp.ptr) { + conn->tmf_state = TMF_INITIAL; /* ctask completed before tmf abort response */ debug_scsi("sc completed while abort in progress\n"); goto success; } /* fall through */ default: - /* timedout or failed */ - spin_unlock_bh(&session->lock); - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - goto failed_unlocked; + conn->tmf_state = TMF_INITIAL; + goto failed; } success: @@ -1276,65 +1503,152 @@ success_unlocked: failed: spin_unlock_bh(&session->lock); failed_unlocked: - debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); + debug_scsi("abort failed [sc %p itt 0x%x]\n", sc, + ctask ? ctask->itt : 0); mutex_unlock(&session->eh_mutex); return FAILED; } EXPORT_SYMBOL_GPL(iscsi_eh_abort); +static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) +{ + memset(hdr, 0, sizeof(*hdr)); + hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; + hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); + hdr->rtt = RESERVED_ITT; +} + +int iscsi_eh_device_reset(struct scsi_cmnd *sc) +{ + struct Scsi_Host *host = sc->device->host; + struct iscsi_session *session = iscsi_hostdata(host->hostdata); + struct iscsi_conn *conn; + struct iscsi_tm *hdr; + int rc = FAILED; + + debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun); + + mutex_lock(&session->eh_mutex); + spin_lock_bh(&session->lock); + /* + * Just check if we are not logged in. We cannot check for + * the phase because the reset could come from a ioctl. + */ + if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) + goto unlock; + conn = session->leadconn; + + /* only have one tmf outstanding at a time */ + if (conn->tmf_state != TMF_INITIAL) + goto unlock; + conn->tmf_state = TMF_QUEUED; + + hdr = &conn->tmhdr; + iscsi_prep_lun_reset_pdu(sc, hdr); + + if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, + session->lu_reset_timeout)) { + rc = FAILED; + goto unlock; + } + + switch (conn->tmf_state) { + case TMF_SUCCESS: + break; + case TMF_TIMEDOUT: + spin_unlock_bh(&session->lock); + iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); + goto done; + default: + conn->tmf_state = TMF_INITIAL; + goto unlock; + } + + rc = SUCCESS; + spin_unlock_bh(&session->lock); + + iscsi_suspend_tx(conn); + /* need to grab the recv lock then session lock */ + write_lock_bh(conn->recv_lock); + spin_lock(&session->lock); + fail_all_commands(conn, sc->device->lun); + conn->tmf_state = TMF_INITIAL; + spin_unlock(&session->lock); + write_unlock_bh(conn->recv_lock); + + iscsi_start_tx(conn); + goto done; + +unlock: + spin_unlock_bh(&session->lock); +done: + debug_scsi("iscsi_eh_device_reset %s\n", + rc == SUCCESS ? "SUCCESS" : "FAILED"); + mutex_unlock(&session->eh_mutex); + return rc; +} +EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); + +/* + * Pre-allocate a pool of @max items of @item_size. By default, the pool + * should be accessed via kfifo_{get,put} on q->queue. + * Optionally, the caller can obtain the array of object pointers + * by passing in a non-NULL @items pointer + */ int -iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) +iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) { - int i; + int i, num_arrays = 1; - *items = kmalloc(max * sizeof(void*), GFP_KERNEL); - if (*items == NULL) - return -ENOMEM; + memset(q, 0, sizeof(*q)); q->max = max; - q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL); - if (q->pool == NULL) { - kfree(*items); - return -ENOMEM; - } + + /* If the user passed an items pointer, he wants a copy of + * the array. */ + if (items) + num_arrays++; + q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); + if (q->pool == NULL) + goto enomem; q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), GFP_KERNEL, NULL); - if (q->queue == ERR_PTR(-ENOMEM)) { - kfree(q->pool); - kfree(*items); - return -ENOMEM; - } + if (q->queue == ERR_PTR(-ENOMEM)) + goto enomem; for (i = 0; i < max; i++) { - q->pool[i] = kmalloc(item_size, GFP_KERNEL); + q->pool[i] = kzalloc(item_size, GFP_KERNEL); if (q->pool[i] == NULL) { - int j; - - for (j = 0; j < i; j++) - kfree(q->pool[j]); - - kfifo_free(q->queue); - kfree(q->pool); - kfree(*items); - return -ENOMEM; + q->max = i; + goto enomem; } - memset(q->pool[i], 0, item_size); - (*items)[i] = q->pool[i]; __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); } + + if (items) { + *items = q->pool + max; + memcpy(*items, q->pool, max * sizeof(void *)); + } + return 0; + +enomem: + iscsi_pool_free(q); + return -ENOMEM; } EXPORT_SYMBOL_GPL(iscsi_pool_init); -void iscsi_pool_free(struct iscsi_queue *q, void **items) +void iscsi_pool_free(struct iscsi_pool *q) { int i; for (i = 0; i < q->max; i++) - kfree(items[i]); - kfree(q->pool); - kfree(items); + kfree(q->pool[i]); + if (q->pool) + kfree(q->pool); } EXPORT_SYMBOL_GPL(iscsi_pool_free); @@ -1387,7 +1701,7 @@ iscsi_session_setup(struct iscsi_transport *iscsit, qdepth = ISCSI_DEF_CMD_PER_LUN; } - if (cmds_max < 2 || (cmds_max & (cmds_max - 1)) || + if (!is_power_of_2(cmds_max) || cmds_max >= ISCSI_MGMT_ITT_OFFSET) { if (cmds_max != 0) printk(KERN_ERR "iscsi: invalid can_queue of %d. " @@ -1411,12 +1725,16 @@ iscsi_session_setup(struct iscsi_transport *iscsit, shost->max_cmd_len = iscsit->max_cmd_len; shost->transportt = scsit; shost->transportt->create_work_queue = 1; + shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; *hostno = shost->host_no; session = iscsi_hostdata(shost->hostdata); memset(session, 0, sizeof(struct iscsi_session)); session->host = shost; session->state = ISCSI_STATE_FREE; + session->fast_abort = 1; + session->lu_reset_timeout = 15; + session->abort_timeout = 10; session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; session->cmds_max = cmds_max; session->queued_cmdsn = session->cmdsn = initial_cmdsn; @@ -1479,9 +1797,9 @@ module_put: cls_session_fail: scsi_remove_host(shost); add_host_fail: - iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); + iscsi_pool_free(&session->mgmtpool); mgmtpool_alloc_fail: - iscsi_pool_free(&session->cmdpool, (void**)session->cmds); + iscsi_pool_free(&session->cmdpool); cmdpool_alloc_fail: scsi_host_put(shost); return NULL; @@ -1501,11 +1819,11 @@ void iscsi_session_teardown(struct iscsi_cls_session *cls_session) struct iscsi_session *session = iscsi_hostdata(shost->hostdata); struct module *owner = cls_session->transport->owner; - iscsi_unblock_session(cls_session); + iscsi_remove_session(cls_session); scsi_remove_host(shost); - iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); - iscsi_pool_free(&session->cmdpool, (void**)session->cmds); + iscsi_pool_free(&session->mgmtpool); + iscsi_pool_free(&session->cmdpool); kfree(session->password); kfree(session->password_in); @@ -1516,7 +1834,7 @@ void iscsi_session_teardown(struct iscsi_cls_session *cls_session) kfree(session->hwaddress); kfree(session->initiatorname); - iscsi_destroy_session(cls_session); + iscsi_free_session(cls_session); scsi_host_put(shost); module_put(owner); } @@ -1546,17 +1864,17 @@ iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx) conn->c_stage = ISCSI_CONN_INITIAL_STAGE; conn->id = conn_idx; conn->exp_statsn = 0; - conn->tmabort_state = TMABORT_INITIAL; + conn->tmf_state = TMF_INITIAL; + + init_timer(&conn->transport_timer); + conn->transport_timer.data = (unsigned long)conn; + conn->transport_timer.function = iscsi_check_transport_timeouts; + INIT_LIST_HEAD(&conn->run_list); INIT_LIST_HEAD(&conn->mgmt_run_list); + INIT_LIST_HEAD(&conn->mgmtqueue); INIT_LIST_HEAD(&conn->xmitqueue); - - /* initialize general immediate & non-immediate PDU commands queue */ - conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), - GFP_KERNEL, NULL); - if (conn->mgmtqueue == ERR_PTR(-ENOMEM)) - goto mgmtqueue_alloc_fail; - + INIT_LIST_HEAD(&conn->requeue); INIT_WORK(&conn->xmitwork, iscsi_xmitworker); /* allocate login_mtask used for the login/text sequences */ @@ -1574,7 +1892,7 @@ iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx) goto login_mtask_data_alloc_fail; conn->login_mtask->data = conn->data = data; - init_timer(&conn->tmabort_timer); + init_timer(&conn->tmf_timer); init_waitqueue_head(&conn->ehwait); return cls_conn; @@ -1583,8 +1901,6 @@ login_mtask_data_alloc_fail: __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, sizeof(void*)); login_mtask_alloc_fail: - kfifo_free(conn->mgmtqueue); -mgmtqueue_alloc_fail: iscsi_destroy_conn(cls_conn); return NULL; } @@ -1603,8 +1919,9 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) struct iscsi_session *session = conn->session; unsigned long flags; + del_timer_sync(&conn->transport_timer); + spin_lock_bh(&session->lock); - set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; if (session->leadconn == conn) { /* @@ -1637,7 +1954,7 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) } /* flush queued up work because we free the connection below */ - scsi_flush_work(session->host); + iscsi_suspend_tx(conn); spin_lock_bh(&session->lock); kfree(conn->data); @@ -1648,8 +1965,6 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) session->leadconn = NULL; spin_unlock_bh(&session->lock); - kfifo_free(conn->mgmtqueue); - iscsi_destroy_conn(cls_conn); } EXPORT_SYMBOL_GPL(iscsi_conn_teardown); @@ -1672,11 +1987,29 @@ int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) return -EINVAL; } + if (conn->ping_timeout && !conn->recv_timeout) { + printk(KERN_ERR "iscsi: invalid recv timeout of zero " + "Using 5 seconds\n."); + conn->recv_timeout = 5; + } + + if (conn->recv_timeout && !conn->ping_timeout) { + printk(KERN_ERR "iscsi: invalid ping timeout of zero " + "Using 5 seconds.\n"); + conn->ping_timeout = 5; + } + spin_lock_bh(&session->lock); conn->c_stage = ISCSI_CONN_STARTED; session->state = ISCSI_STATE_LOGGED_IN; session->queued_cmdsn = session->cmdsn; + conn->last_recv = jiffies; + conn->last_ping = jiffies; + if (conn->recv_timeout && conn->ping_timeout) + mod_timer(&conn->transport_timer, + jiffies + (conn->recv_timeout * HZ)); + switch(conn->stop_stage) { case STOP_CONN_RECOVER: /* @@ -1684,7 +2017,7 @@ int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) * commands after successful recovery */ conn->stop_stage = 0; - conn->tmabort_state = TMABORT_INITIAL; + conn->tmf_state = TMF_INITIAL; session->age++; spin_unlock_bh(&session->lock); @@ -1709,55 +2042,27 @@ flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) struct iscsi_mgmt_task *mtask, *tmp; /* handle pending */ - while (__kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) { - if (mtask == conn->login_mtask) - continue; + list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) { debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt); - __kfifo_put(session->mgmtpool.queue, (void*)&mtask, - sizeof(void*)); + iscsi_free_mgmt_task(conn, mtask); } /* handle running */ list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) { debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt); - list_del(&mtask->running); - - if (mtask == conn->login_mtask) - continue; - __kfifo_put(session->mgmtpool.queue, (void*)&mtask, - sizeof(void*)); + iscsi_free_mgmt_task(conn, mtask); } conn->mtask = NULL; } -/* Fail commands. Mutex and session lock held and recv side suspended */ -static void fail_all_commands(struct iscsi_conn *conn) -{ - struct iscsi_cmd_task *ctask, *tmp; - - /* flush pending */ - list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) { - debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc, - ctask->itt); - fail_command(conn, ctask, DID_BUS_BUSY << 16); - } - - /* fail all other running */ - list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { - debug_scsi("failing in progress sc %p itt 0x%x\n", - ctask->sc, ctask->itt); - fail_command(conn, ctask, DID_BUS_BUSY << 16); - } - - conn->ctask = NULL; -} - static void iscsi_start_session_recovery(struct iscsi_session *session, struct iscsi_conn *conn, int flag) { int old_stop_stage; + del_timer_sync(&conn->transport_timer); + mutex_lock(&session->eh_mutex); spin_lock_bh(&session->lock); if (conn->stop_stage == STOP_CONN_TERM) { @@ -1818,7 +2123,7 @@ static void iscsi_start_session_recovery(struct iscsi_session *session, * flush queues. */ spin_lock_bh(&session->lock); - fail_all_commands(conn); + fail_all_commands(conn, -1); flush_control_queues(session, conn); spin_unlock_bh(&session->lock); mutex_unlock(&session->eh_mutex); @@ -1869,6 +2174,21 @@ int iscsi_set_param(struct iscsi_cls_conn *cls_conn, uint32_t value; switch(param) { + case ISCSI_PARAM_FAST_ABORT: + sscanf(buf, "%d", &session->fast_abort); + break; + case ISCSI_PARAM_ABORT_TMO: + sscanf(buf, "%d", &session->abort_timeout); + break; + case ISCSI_PARAM_LU_RESET_TMO: + sscanf(buf, "%d", &session->lu_reset_timeout); + break; + case ISCSI_PARAM_PING_TMO: + sscanf(buf, "%d", &conn->ping_timeout); + break; + case ISCSI_PARAM_RECV_TMO: + sscanf(buf, "%d", &conn->recv_timeout); + break; case ISCSI_PARAM_MAX_RECV_DLENGTH: sscanf(buf, "%d", &conn->max_recv_dlength); break; @@ -1983,6 +2303,15 @@ int iscsi_session_get_param(struct iscsi_cls_session *cls_session, int len; switch(param) { + case ISCSI_PARAM_FAST_ABORT: + len = sprintf(buf, "%d\n", session->fast_abort); + break; + case ISCSI_PARAM_ABORT_TMO: + len = sprintf(buf, "%d\n", session->abort_timeout); + break; + case ISCSI_PARAM_LU_RESET_TMO: + len = sprintf(buf, "%d\n", session->lu_reset_timeout); + break; case ISCSI_PARAM_INITIAL_R2T_EN: len = sprintf(buf, "%d\n", session->initial_r2t_en); break; @@ -2040,6 +2369,12 @@ int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, int len; switch(param) { + case ISCSI_PARAM_PING_TMO: + len = sprintf(buf, "%u\n", conn->ping_timeout); + break; + case ISCSI_PARAM_RECV_TMO: + len = sprintf(buf, "%u\n", conn->recv_timeout); + break; case ISCSI_PARAM_MAX_RECV_DLENGTH: len = sprintf(buf, "%u\n", conn->max_recv_dlength); break; |