X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Fscsi%2Flibiscsi.c;h=ff891543df22efe44373d823b93b2e434169e90f;hb=32ae763e3fce4192cd008956a340353a2e5c3192;hp=1632866f52cc4fc5749aad7e60b24946ff3d06b7;hpb=1548271ece9e9312fd5feb41fd58773b56a71d39;p=safe%2Fjmp%2Flinux-2.6 diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c index 1632866..ff89154 100644 --- a/drivers/scsi/libiscsi.c +++ b/drivers/scsi/libiscsi.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include #include @@ -37,13 +38,27 @@ #include #include -struct iscsi_session * -class_to_transport_session(struct iscsi_cls_session *cls_session) -{ - struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); - return iscsi_hostdata(shost->hostdata); -} -EXPORT_SYMBOL_GPL(class_to_transport_session); +static int iscsi_dbg_lib; +module_param_named(debug_libiscsi, iscsi_dbg_lib, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(debug_libiscsi, "Turn on debugging for libiscsi module. " + "Set to 1 to turn on, and zero to turn off. Default " + "is off."); + +#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ + do { \ + if (iscsi_dbg_lib) \ + iscsi_conn_printk(KERN_INFO, _conn, \ + "%s " dbg_fmt, \ + __func__, ##arg); \ + } while (0); + +#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ + do { \ + if (iscsi_dbg_lib) \ + iscsi_session_printk(KERN_INFO, _session, \ + "%s " dbg_fmt, \ + __func__, ##arg); \ + } while (0); /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ #define SNA32_CHECK 2147483648UL @@ -61,6 +76,15 @@ static int iscsi_sna_lte(u32 n1, u32 n2) (n1 > n2 && (n2 - n1 < SNA32_CHECK))); } +inline void iscsi_conn_queue_work(struct iscsi_conn *conn) +{ + struct Scsi_Host *shost = conn->session->host; + struct iscsi_host *ihost = shost_priv(shost); + + queue_work(ihost->workq, &conn->xmitwork); +} +EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); + void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) { @@ -86,72 +110,199 @@ iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) * xmit thread */ if (!list_empty(&session->leadconn->xmitqueue) || - __kfifo_len(session->leadconn->mgmtqueue)) - scsi_queue_work(session->host, - &session->leadconn->xmitwork); + !list_empty(&session->leadconn->mgmtqueue)) { + if (!(session->tt->caps & CAP_DATA_PATH_OFFLOAD)) + iscsi_conn_queue_work(session->leadconn); + } } } EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); -void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask, - struct iscsi_data *hdr) +/** + * iscsi_prep_data_out_pdu - initialize Data-Out + * @task: scsi command task + * @r2t: R2T info + * @hdr: iscsi data in pdu + * + * Notes: + * Initialize Data-Out within this R2T sequence and finds + * proper data_offset within this SCSI command. + * + * This function is called with connection lock taken. + **/ +void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, + struct iscsi_data *hdr) { - struct iscsi_conn *conn = ctask->conn; + struct iscsi_conn *conn = task->conn; + unsigned int left = r2t->data_length - r2t->sent; + + task->hdr_len = sizeof(struct iscsi_data); memset(hdr, 0, sizeof(struct iscsi_data)); - hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); - hdr->datasn = cpu_to_be32(ctask->unsol_datasn); - ctask->unsol_datasn++; + hdr->ttt = r2t->ttt; + hdr->datasn = cpu_to_be32(r2t->datasn); + r2t->datasn++; hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; - memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); - - hdr->itt = ctask->hdr->itt; - hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); - hdr->offset = cpu_to_be32(ctask->unsol_offset); - - if (ctask->unsol_count > conn->max_xmit_dlength) { + memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); + hdr->itt = task->hdr_itt; + hdr->exp_statsn = r2t->exp_statsn; + hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); + if (left > conn->max_xmit_dlength) { hton24(hdr->dlength, conn->max_xmit_dlength); - ctask->data_count = conn->max_xmit_dlength; - ctask->unsol_offset += ctask->data_count; + r2t->data_count = conn->max_xmit_dlength; hdr->flags = 0; } else { - hton24(hdr->dlength, ctask->unsol_count); - ctask->data_count = ctask->unsol_count; + hton24(hdr->dlength, left); + r2t->data_count = left; hdr->flags = ISCSI_FLAG_CMD_FINAL; } + conn->dataout_pdus_cnt++; +} +EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); + +static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) +{ + unsigned exp_len = task->hdr_len + len; + + if (exp_len > task->hdr_max) { + WARN_ON(1); + return -EINVAL; + } + + WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ + task->hdr_len = exp_len; + return 0; +} + +/* + * make an extended cdb AHS + */ +static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) +{ + struct scsi_cmnd *cmd = task->sc; + unsigned rlen, pad_len; + unsigned short ahslength; + struct iscsi_ecdb_ahdr *ecdb_ahdr; + int rc; + + ecdb_ahdr = iscsi_next_hdr(task); + rlen = cmd->cmd_len - ISCSI_CDB_SIZE; + + BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); + ahslength = rlen + sizeof(ecdb_ahdr->reserved); + + pad_len = iscsi_padding(rlen); + + rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + + sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); + if (rc) + return rc; + + if (pad_len) + memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); + + ecdb_ahdr->ahslength = cpu_to_be16(ahslength); + ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; + ecdb_ahdr->reserved = 0; + memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); + + ISCSI_DBG_SESSION(task->conn->session, + "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " + "rlen %d pad_len %d ahs_length %d iscsi_headers_size " + "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, + task->hdr_len); + return 0; +} + +static int iscsi_prep_bidi_ahs(struct iscsi_task *task) +{ + struct scsi_cmnd *sc = task->sc; + struct iscsi_rlength_ahdr *rlen_ahdr; + int rc; + + rlen_ahdr = iscsi_next_hdr(task); + rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); + if (rc) + return rc; + + rlen_ahdr->ahslength = + cpu_to_be16(sizeof(rlen_ahdr->read_length) + + sizeof(rlen_ahdr->reserved)); + rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; + rlen_ahdr->reserved = 0; + rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); + + ISCSI_DBG_SESSION(task->conn->session, + "bidi-in rlen_ahdr->read_length(%d) " + "rlen_ahdr->ahslength(%d)\n", + be32_to_cpu(rlen_ahdr->read_length), + be16_to_cpu(rlen_ahdr->ahslength)); + return 0; } -EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); /** * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu - * @ctask: iscsi cmd task + * @task: iscsi task * * 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_task *task) { - struct iscsi_conn *conn = ctask->conn; + struct iscsi_conn *conn = task->conn; struct iscsi_session *session = conn->session; - struct iscsi_cmd *hdr = ctask->hdr; - struct scsi_cmnd *sc = ctask->sc; - - 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(sc->request_bufflen); - 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; + struct scsi_cmnd *sc = task->sc; + struct iscsi_cmd *hdr; + unsigned hdrlength, cmd_len; + itt_t itt; + int rc; + + rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); + if (rc) + return rc; + hdr = (struct iscsi_cmd *) task->hdr; + itt = hdr->itt; + memset(hdr, 0, sizeof(*hdr)); + + if (session->tt->parse_pdu_itt) + hdr->itt = task->hdr_itt = itt; + else + hdr->itt = task->hdr_itt = build_itt(task->itt, + task->conn->session->age); + task->hdr_len = 0; + rc = iscsi_add_hdr(task, 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); + memcpy(task->lun, hdr->lun, sizeof(task->lun)); + hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); + session->cmdsn++; + hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); + cmd_len = sc->cmd_len; + if (cmd_len < ISCSI_CDB_SIZE) + memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); + else if (cmd_len > ISCSI_CDB_SIZE) { + rc = iscsi_prep_ecdb_ahs(task); + if (rc) + return rc; + cmd_len = ISCSI_CDB_SIZE; + } + memcpy(hdr->cdb, sc->cmnd, cmd_len); + + task->imm_count = 0; + if (scsi_bidi_cmnd(sc)) { + hdr->flags |= ISCSI_FLAG_CMD_READ; + rc = iscsi_prep_bidi_ahs(task); + if (rc) + return rc; + } if (sc->sc_data_direction == DMA_TO_DEVICE) { + unsigned out_len = scsi_out(sc)->length; + struct iscsi_r2t_info *r2t = &task->unsol_r2t; + + hdr->data_length = cpu_to_be32(out_len); hdr->flags |= ISCSI_FLAG_CMD_WRITE; /* * Write counters: @@ -163,89 +314,321 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) * without R2T ack right after * immediate data * - * r2t_data_count bytes to be sent via R2T ack's + * r2t data_length bytes to be sent via R2T ack's * * pad_count bytes to be sent as zero-padding */ - ctask->unsol_count = 0; - ctask->unsol_offset = 0; - ctask->unsol_datasn = 0; + memset(r2t, 0, sizeof(*r2t)); if (session->imm_data_en) { - if (sc->request_bufflen >= session->first_burst) - ctask->imm_count = min(session->first_burst, + if (out_len >= session->first_burst) + task->imm_count = min(session->first_burst, conn->max_xmit_dlength); else - ctask->imm_count = min(sc->request_bufflen, + task->imm_count = min(out_len, conn->max_xmit_dlength); - hton24(ctask->hdr->dlength, ctask->imm_count); + hton24(hdr->dlength, task->imm_count); } else - zero_data(ctask->hdr->dlength); + zero_data(hdr->dlength); if (!session->initial_r2t_en) { - ctask->unsol_count = min((session->first_burst), - (sc->request_bufflen)) - ctask->imm_count; - ctask->unsol_offset = ctask->imm_count; + r2t->data_length = min(session->first_burst, out_len) - + task->imm_count; + r2t->data_offset = task->imm_count; + r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); + r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); } - if (!ctask->unsol_count) + if (!task->unsol_r2t.data_length) /* 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); + hdr->data_length = cpu_to_be32(scsi_in(sc)->length); if (sc->sc_data_direction == DMA_FROM_DEVICE) hdr->flags |= ISCSI_FLAG_CMD_READ; } - conn->scsicmd_pdus_cnt++; + /* calculate size of additional header segments (AHSs) */ + hdrlength = task->hdr_len - sizeof(*hdr); + + WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); + hdrlength /= ISCSI_PAD_LEN; + + WARN_ON(hdrlength >= 256); + hdr->hlength = hdrlength & 0xFF; - 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", - conn->id, sc, sc->cmnd[0], ctask->itt, sc->request_bufflen, - session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); + if (session->tt->init_task && session->tt->init_task(task)) + return -EIO; + + task->state = ISCSI_TASK_RUNNING; + list_move_tail(&task->running, &conn->run_list); + + conn->scsicmd_pdus_cnt++; + ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " + "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n", + scsi_bidi_cmnd(sc) ? "bidirectional" : + sc->sc_data_direction == DMA_TO_DEVICE ? + "write" : "read", conn->id, sc, sc->cmnd[0], + task->itt, scsi_bufflen(sc), + scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, + session->cmdsn, + session->max_cmdsn - session->exp_cmdsn + 1); + return 0; } /** - * iscsi_complete_command - return command back to scsi-ml - * @ctask: iscsi cmd task + * iscsi_complete_command - finish a task + * @task: iscsi cmd task * * Must be called with session lock. - * This function returns the scsi command to scsi-ml and returns - * the cmd task to the pool of available cmd tasks. + * This function returns the scsi command to scsi-ml or cleans + * up mgmt tasks then returns the task to the pool. */ -static void iscsi_complete_command(struct iscsi_cmd_task *ctask) +static void iscsi_complete_command(struct iscsi_task *task) { - struct iscsi_session *session = ctask->conn->session; - struct scsi_cmnd *sc = ctask->sc; + struct iscsi_conn *conn = task->conn; + struct iscsi_session *session = conn->session; + struct scsi_cmnd *sc = task->sc; - ctask->state = ISCSI_TASK_COMPLETED; - ctask->sc = NULL; - /* SCSI eh reuses commands to verify us */ - sc->SCp.ptr = NULL; - list_del_init(&ctask->running); - __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); - sc->scsi_done(sc); + session->tt->cleanup_task(task); + list_del_init(&task->running); + task->state = ISCSI_TASK_COMPLETED; + task->sc = NULL; + + if (conn->task == task) + conn->task = NULL; + /* + * login task is preallocated so do not free + */ + if (conn->login_task == task) + return; + + __kfifo_put(session->cmdpool.queue, (void*)&task, sizeof(void*)); + + if (conn->ping_task == task) + conn->ping_task = NULL; + + if (sc) { + task->sc = NULL; + /* SCSI eh reuses commands to verify us */ + sc->SCp.ptr = NULL; + /* + * queue command may call this to free the task, but + * not have setup the sc callback + */ + if (sc->scsi_done) + sc->scsi_done(sc); + } } -static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask) +void __iscsi_get_task(struct iscsi_task *task) { - atomic_inc(&ctask->refcount); + atomic_inc(&task->refcount); +} +EXPORT_SYMBOL_GPL(__iscsi_get_task); + +static void __iscsi_put_task(struct iscsi_task *task) +{ + if (atomic_dec_and_test(&task->refcount)) + iscsi_complete_command(task); +} + +void iscsi_put_task(struct iscsi_task *task) +{ + struct iscsi_session *session = task->conn->session; + + spin_lock_bh(&session->lock); + __iscsi_put_task(task); + spin_unlock_bh(&session->lock); +} +EXPORT_SYMBOL_GPL(iscsi_put_task); + +/* + * session lock must be held + */ +static void fail_command(struct iscsi_conn *conn, struct iscsi_task *task, + int err) +{ + struct scsi_cmnd *sc; + + sc = task->sc; + if (!sc) + return; + + if (task->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--; + + sc->result = err; + if (!scsi_bidi_cmnd(sc)) + scsi_set_resid(sc, scsi_bufflen(sc)); + else { + scsi_out(sc)->resid = scsi_out(sc)->length; + scsi_in(sc)->resid = scsi_in(sc)->length; + } + + if (conn->task == task) + conn->task = NULL; + /* release ref from queuecommand */ + __iscsi_put_task(task); +} + +static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, + struct iscsi_task *task) +{ + struct iscsi_session *session = conn->session; + struct iscsi_hdr *hdr = task->hdr; + struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; + + if (conn->session->state == ISCSI_STATE_LOGGING_OUT) + return -ENOTCONN; + + if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) && + hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) + nop->exp_statsn = cpu_to_be32(conn->exp_statsn); + /* + * pre-format CmdSN for outgoing PDU. + */ + nop->cmdsn = cpu_to_be32(session->cmdsn); + if (hdr->itt != RESERVED_ITT) { + /* + * TODO: We always use immediate, so we never hit this. + * If we start to send tmfs or nops as non-immediate then + * we should start checking the cmdsn numbers for mgmt tasks. + */ + if (conn->c_stage == ISCSI_CONN_STARTED && + !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { + session->queued_cmdsn++; + session->cmdsn++; + } + } + + if (session->tt->init_task && session->tt->init_task(task)) + return -EIO; + + if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) + session->state = ISCSI_STATE_LOGGING_OUT; + + task->state = ISCSI_TASK_RUNNING; + list_move_tail(&task->running, &conn->mgmt_run_list); + ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " + "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, + hdr->itt, task->data_count); + return 0; +} + +static struct iscsi_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_task *task; + itt_t itt; + + 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 task can be used. Same ITT must be used. + * Note that login_task is preallocated at conn_create(). + */ + task = conn->login_task; + else { + BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); + BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); + + if (!__kfifo_get(session->cmdpool.queue, + (void*)&task, sizeof(void*))) + return NULL; + } + /* + * released in complete pdu for task we expect a response for, and + * released by the lld when it has transmitted the task for + * pdus we do not expect a response for. + */ + atomic_set(&task->refcount, 1); + task->conn = conn; + task->sc = NULL; + + if (data_size) { + memcpy(task->data, data, data_size); + task->data_count = data_size; + } else + task->data_count = 0; + + if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { + iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " + "pdu for mgmt task.\n"); + goto requeue_task; + } + itt = task->hdr->itt; + task->hdr_len = sizeof(struct iscsi_hdr); + memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); + + if (hdr->itt != RESERVED_ITT) { + if (session->tt->parse_pdu_itt) + task->hdr->itt = itt; + else + task->hdr->itt = build_itt(task->itt, + task->conn->session->age); + } + + INIT_LIST_HEAD(&task->running); + list_add_tail(&task->running, &conn->mgmtqueue); + + if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) { + if (iscsi_prep_mgmt_task(conn, task)) + goto free_task; + + if (session->tt->xmit_task(task)) + goto free_task; + + } else + iscsi_conn_queue_work(conn); + + return task; + +free_task: + __iscsi_put_task(task); + return NULL; + +requeue_task: + if (task != conn->login_task) + __kfifo_put(session->cmdpool.queue, (void*)&task, + sizeof(void*)); + return NULL; } -static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask) +int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, + char *data, uint32_t data_size) { - if (atomic_dec_and_test(&ctask->refcount)) - iscsi_complete_command(ctask); + 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); + return err; } +EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); /** * iscsi_cmd_rsp - SCSI Command Response processing * @conn: iscsi connection * @hdr: iscsi header - * @ctask: scsi command task + * @task: scsi command task * @data: cmd data buffer * @datalen: len of buffer * @@ -253,12 +636,12 @@ static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask) * then completes the command and task. **/ static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, - struct iscsi_cmd_task *ctask, char *data, + struct iscsi_task *task, char *data, int datalen) { struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; struct iscsi_session *session = conn->session; - struct scsi_cmnd *sc = ctask->sc; + struct scsi_cmnd *sc = task->sc; iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; @@ -275,43 +658,88 @@ static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, if (datalen < 2) { invalid_datalen: - printk(KERN_ERR "iscsi: Got CHECK_CONDITION but " - "invalid data buffer size of %d\n", datalen); + iscsi_conn_printk(KERN_ERR, conn, + "Got CHECK_CONDITION but invalid data " + "buffer size of %d\n", datalen); sc->result = DID_BAD_TARGET << 16; goto out; } - senselen = be16_to_cpu(get_unaligned((__be16 *) data)); + senselen = get_unaligned_be16(data); if (datalen < senselen) goto invalid_datalen; memcpy(sc->sense_buffer, data + 2, min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); - debug_scsi("copied %d bytes of sense\n", - min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); + ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", + min_t(uint16_t, senselen, + SCSI_SENSE_BUFFERSIZE)); } - if (sc->sc_data_direction == DMA_TO_DEVICE) - goto out; + if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | + ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { + int res_count = be32_to_cpu(rhdr->bi_residual_count); + + if (scsi_bidi_cmnd(sc) && res_count > 0 && + (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || + res_count <= scsi_in(sc)->length)) + scsi_in(sc)->resid = res_count; + else + sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; + } - 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 <= sc->request_bufflen) - sc->resid = res_count; + if (res_count > 0 && + (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || + res_count <= scsi_bufflen(sc))) + /* write side for bidi or uni-io set_resid */ + 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) - sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; - else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) - sc->resid = be32_to_cpu(rhdr->residual_count); - + } out: - debug_scsi("done [sc %lx res %d itt 0x%x]\n", - (long)sc, sc->result, ctask->itt); + ISCSI_DBG_SESSION(session, "done [sc %p res %d itt 0x%x]\n", + sc, sc->result, task->itt); conn->scsirsp_pdus_cnt++; - __iscsi_put_ctask(ctask); + __iscsi_put_task(task); +} + +/** + * iscsi_data_in_rsp - SCSI Data-In Response processing + * @conn: iscsi connection + * @hdr: iscsi pdu + * @task: scsi command task + **/ +static void +iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, + struct iscsi_task *task) +{ + struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; + struct scsi_cmnd *sc = task->sc; + + if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) + return; + + sc->result = (DID_OK << 16) | rhdr->cmd_status; + conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; + if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | + ISCSI_FLAG_DATA_OVERFLOW)) { + int res_count = be32_to_cpu(rhdr->residual_count); + + if (res_count > 0 && + (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || + res_count <= scsi_in(sc)->length)) + scsi_in(sc)->resid = res_count; + else + sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; + } + + conn->scsirsp_pdus_cnt++; + __iscsi_put_task(task); } static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) @@ -321,24 +749,52 @@ 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_task *task; + + if (!rhdr && conn->ping_task) + 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; + + task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); + if (!task) + iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); + else if (!rhdr) { + /* only track our nops */ + conn->ping_task = task; + conn->last_ping = jiffies; + } +} + static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, char *data, int datalen) { struct iscsi_reject *reject = (struct iscsi_reject *)hdr; struct iscsi_hdr rejected_pdu; - uint32_t itt; conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; @@ -348,16 +804,44 @@ static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); - itt = get_itt(rejected_pdu.itt); - printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected " - "due to DataDigest error.\n", itt, - rejected_pdu.opcode); + iscsi_conn_printk(KERN_ERR, conn, + "pdu (op 0x%x) rejected " + "due to DataDigest error.\n", + rejected_pdu.opcode); } } return 0; } /** + * iscsi_itt_to_task - look up task by itt + * @conn: iscsi connection + * @itt: itt + * + * This should be used for mgmt tasks like login and nops, or if + * the LDD's itt space does not include the session age. + * + * The session lock must be held. + */ +static struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) +{ + struct iscsi_session *session = conn->session; + int i; + + if (itt == RESERVED_ITT) + return NULL; + + if (session->tt->parse_pdu_itt) + session->tt->parse_pdu_itt(conn, itt, &i, NULL); + else + i = get_itt(itt); + if (i >= session->cmds_max) + return NULL; + + return session->cmds[i]; +} + +/** * __iscsi_complete_pdu - complete pdu * @conn: iscsi conn * @hdr: iscsi header @@ -373,97 +857,23 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, { struct iscsi_session *session = conn->session; int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; - struct iscsi_cmd_task *ctask; - struct iscsi_mgmt_task *mtask; + struct iscsi_task *task; uint32_t itt; + conn->last_recv = jiffies; + rc = iscsi_verify_itt(conn, hdr->itt); + if (rc) + return rc; + if (hdr->itt != RESERVED_ITT) itt = get_itt(hdr->itt); else itt = ~0U; - if (itt < session->cmds_max) { - ctask = session->cmds[itt]; - - debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n", - opcode, conn->id, ctask->itt, datalen); - - switch(opcode) { - case ISCSI_OP_SCSI_CMD_RSP: - BUG_ON((void*)ctask != ctask->sc->SCp.ptr); - iscsi_scsi_cmd_rsp(conn, hdr, ctask, data, - datalen); - break; - case ISCSI_OP_SCSI_DATA_IN: - BUG_ON((void*)ctask != ctask->sc->SCp.ptr); - if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { - conn->scsirsp_pdus_cnt++; - __iscsi_put_ctask(ctask); - } - break; - case ISCSI_OP_R2T: - /* LLD handles this for now */ - break; - default: - rc = ISCSI_ERR_BAD_OPCODE; - break; - } - } else if (itt >= ISCSI_MGMT_ITT_OFFSET && - itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) { - mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET]; - - debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", - opcode, conn->id, mtask->itt, datalen); + ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", + opcode, conn->id, itt, datalen); - iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); - switch(opcode) { - case ISCSI_OP_LOGOUT_RSP: - if (datalen) { - rc = ISCSI_ERR_PROTO; - break; - } - conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; - /* fall through */ - case ISCSI_OP_LOGIN_RSP: - case ISCSI_OP_TEXT_RSP: - /* - * login related PDU's exp_statsn is handled in - * userspace - */ - 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*)); - break; - case ISCSI_OP_SCSI_TMFUNC_RSP: - if (datalen) { - rc = ISCSI_ERR_PROTO; - break; - } - - iscsi_tmf_rsp(conn, hdr); - break; - case ISCSI_OP_NOOP_IN: - 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*)); - break; - default: - rc = ISCSI_ERR_BAD_OPCODE; - break; - } - } else if (itt == ~0U) { + if (itt == ~0U) { iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); switch(opcode) { @@ -476,8 +886,7 @@ 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); @@ -491,9 +900,96 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, rc = ISCSI_ERR_BAD_OPCODE; break; } - } else - rc = ISCSI_ERR_BAD_ITT; + goto out; + } + + switch(opcode) { + case ISCSI_OP_SCSI_CMD_RSP: + case ISCSI_OP_SCSI_DATA_IN: + task = iscsi_itt_to_ctask(conn, hdr->itt); + if (!task) + return ISCSI_ERR_BAD_ITT; + break; + case ISCSI_OP_R2T: + /* + * LLD handles R2Ts if they need to. + */ + return 0; + case ISCSI_OP_LOGOUT_RSP: + case ISCSI_OP_LOGIN_RSP: + case ISCSI_OP_TEXT_RSP: + case ISCSI_OP_SCSI_TMFUNC_RSP: + case ISCSI_OP_NOOP_IN: + task = iscsi_itt_to_task(conn, hdr->itt); + if (!task) + return ISCSI_ERR_BAD_ITT; + break; + default: + return ISCSI_ERR_BAD_OPCODE; + } + switch(opcode) { + case ISCSI_OP_SCSI_CMD_RSP: + iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); + break; + case ISCSI_OP_SCSI_DATA_IN: + iscsi_data_in_rsp(conn, hdr, task); + break; + case ISCSI_OP_LOGOUT_RSP: + iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); + if (datalen) { + rc = ISCSI_ERR_PROTO; + break; + } + conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; + goto recv_pdu; + case ISCSI_OP_LOGIN_RSP: + case ISCSI_OP_TEXT_RSP: + iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); + /* + * login related PDU's exp_statsn is handled in + * userspace + */ + goto recv_pdu; + case ISCSI_OP_SCSI_TMFUNC_RSP: + iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); + if (datalen) { + rc = ISCSI_ERR_PROTO; + break; + } + + iscsi_tmf_rsp(conn, hdr); + __iscsi_put_task(task); + break; + case ISCSI_OP_NOOP_IN: + iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); + 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 (conn->ping_task != task) + /* + * If this is not in response to one of our + * nops then it must be from userspace. + */ + goto recv_pdu; + + mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); + __iscsi_put_task(task); + break; + default: + rc = ISCSI_ERR_BAD_OPCODE; + break; + } + +out: + return rc; +recv_pdu: + if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) + rc = ISCSI_ERR_CONN_FAILED; + __iscsi_put_task(task); return rc; } EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); @@ -510,55 +1006,100 @@ int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, } EXPORT_SYMBOL_GPL(iscsi_complete_pdu); -/* verify itt (itt encoding: age+cid+itt) */ -int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr, - uint32_t *ret_itt) +int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) { struct iscsi_session *session = conn->session; - struct iscsi_cmd_task *ctask; - uint32_t itt; + int age = 0, i = 0; - if (hdr->itt != RESERVED_ITT) { - if (((__force u32)hdr->itt & ISCSI_AGE_MASK) != - (session->age << ISCSI_AGE_SHIFT)) { - printk(KERN_ERR "iscsi: received itt %x expected " - "session age (%x)\n", (__force u32)hdr->itt, - session->age & ISCSI_AGE_MASK); - return ISCSI_ERR_BAD_ITT; - } + if (itt == RESERVED_ITT) + return 0; - if (((__force u32)hdr->itt & ISCSI_CID_MASK) != - (conn->id << ISCSI_CID_SHIFT)) { - printk(KERN_ERR "iscsi: received itt %x, expected " - "CID (%x)\n", (__force u32)hdr->itt, conn->id); - return ISCSI_ERR_BAD_ITT; - } - itt = get_itt(hdr->itt); - } else - itt = ~0U; + if (session->tt->parse_pdu_itt) + session->tt->parse_pdu_itt(conn, itt, &i, &age); + else { + i = get_itt(itt); + age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; + } + + if (age != session->age) { + iscsi_conn_printk(KERN_ERR, conn, + "received itt %x expected session age (%x)\n", + (__force u32)itt, session->age); + return ISCSI_ERR_BAD_ITT; + } + + if (i >= session->cmds_max) { + iscsi_conn_printk(KERN_ERR, conn, + "received invalid itt index %u (max cmds " + "%u.\n", i, session->cmds_max); + return ISCSI_ERR_BAD_ITT; + } + return 0; +} +EXPORT_SYMBOL_GPL(iscsi_verify_itt); + +/** + * iscsi_itt_to_ctask - look up ctask by itt + * @conn: iscsi connection + * @itt: itt + * + * This should be used for cmd tasks. + * + * The session lock must be held. + */ +struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) +{ + struct iscsi_task *task; + + if (iscsi_verify_itt(conn, itt)) + return NULL; + + task = iscsi_itt_to_task(conn, itt); + if (!task || !task->sc) + return NULL; + + if (task->sc->SCp.phase != conn->session->age) { + iscsi_session_printk(KERN_ERR, conn->session, + "task's session age %d, expected %d\n", + task->sc->SCp.phase, conn->session->age); + return NULL; + } - if (itt < session->cmds_max) { - ctask = session->cmds[itt]; + return task; +} +EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); - if (!ctask->sc) { - printk(KERN_INFO "iscsi: dropping ctask with " - "itt 0x%x\n", ctask->itt); - /* force drop */ - return ISCSI_ERR_NO_SCSI_CMD; - } +void iscsi_session_failure(struct iscsi_cls_session *cls_session, + enum iscsi_err err) +{ + struct iscsi_session *session = cls_session->dd_data; + struct iscsi_conn *conn; + struct device *dev; + unsigned long flags; - if (ctask->sc->SCp.phase != session->age) { - printk(KERN_ERR "iscsi: ctask's session age %d, " - "expected %d\n", ctask->sc->SCp.phase, - session->age); - return ISCSI_ERR_SESSION_FAILED; - } + spin_lock_irqsave(&session->lock, flags); + conn = session->leadconn; + if (session->state == ISCSI_STATE_TERMINATE || !conn) { + spin_unlock_irqrestore(&session->lock, flags); + return; } - *ret_itt = itt; - return 0; + dev = get_device(&conn->cls_conn->dev); + spin_unlock_irqrestore(&session->lock, flags); + if (!dev) + return; + /* + * if the host is being removed bypass the connection + * recovery initialization because we are going to kill + * the session. + */ + if (err == ISCSI_ERR_INVALID_HOST) + iscsi_conn_error_event(conn->cls_conn, err); + else + iscsi_conn_failure(conn, err); + put_device(dev); } -EXPORT_SYMBOL_GPL(iscsi_verify_itt); +EXPORT_SYMBOL_GPL(iscsi_session_failure); void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) { @@ -574,66 +1115,13 @@ void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) if (conn->stop_stage == 0) session->state = ISCSI_STATE_FAILED; spin_unlock_irqrestore(&session->lock, flags); + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); - iscsi_conn_error(conn->cls_conn, err); + iscsi_conn_error_event(conn->cls_conn, err); } EXPORT_SYMBOL_GPL(iscsi_conn_failure); -static void iscsi_prep_mtask(struct iscsi_conn *conn, - struct iscsi_mgmt_task *mtask) -{ - struct iscsi_session *session = conn->session; - struct iscsi_hdr *hdr = mtask->hdr; - struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; - - if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) && - hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) - nop->exp_statsn = cpu_to_be32(conn->exp_statsn); - /* - * pre-format CmdSN for outgoing PDU. - */ - nop->cmdsn = cpu_to_be32(session->cmdsn); - if (hdr->itt != RESERVED_ITT) { - hdr->itt = build_itt(mtask->itt, conn->id, session->age); - if (conn->c_stage == ISCSI_CONN_STARTED && - !(hdr->opcode & ISCSI_OP_IMMEDIATE)) - session->cmdsn++; - } - - if (session->tt->init_mgmt_task) - 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); -} - -static int iscsi_xmit_mtask(struct iscsi_conn *conn) -{ - struct iscsi_hdr *hdr = conn->mtask->hdr; - int rc, was_logout = 0; - - 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) - return rc; - - /* done with this in-progress mtask */ - conn->mtask = NULL; - - if (was_logout) { - set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); - return -ENODATA; - } - return 0; -} - static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) { struct iscsi_session *session = conn->session; @@ -641,39 +1129,50 @@ static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) /* * Check for iSCSI window and take care of CmdSN wrap-around */ - if (!iscsi_sna_lte(session->cmdsn, session->max_cmdsn)) { - debug_scsi("iSCSI CmdSN closed. MaxCmdSN %u CmdSN %u\n", - session->max_cmdsn, session->cmdsn); + if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { + ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " + "%u MaxCmdSN %u CmdSN %u/%u\n", + session->exp_cmdsn, session->max_cmdsn, + session->cmdsn, session->queued_cmdsn); return -ENOSPC; } return 0; } -static int iscsi_xmit_ctask(struct iscsi_conn *conn) +static int iscsi_xmit_task(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; + struct iscsi_task *task = conn->task; + int rc; - __iscsi_get_ctask(ctask); + __iscsi_get_task(task); spin_unlock_bh(&conn->session->lock); - rc = conn->session->tt->xmit_cmd_task(conn, ctask); + rc = conn->session->tt->xmit_task(task); spin_lock_bh(&conn->session->lock); - __iscsi_put_ctask(ctask); - -done: + __iscsi_put_task(task); if (!rc) - /* done with this ctask */ - conn->ctask = NULL; + /* done with this task */ + conn->task = NULL; return rc; } /** + * iscsi_requeue_task - requeue task to run from session workqueue + * @task: task to requeue + * + * LLDs that need to run a task from the session workqueue should call + * this. The session lock must be held. This should only be called + * by software drivers. + */ +void iscsi_requeue_task(struct iscsi_task *task) +{ + struct iscsi_conn *conn = task->conn; + + list_move_tail(&task->running, &conn->requeue); + iscsi_conn_queue_work(conn); +} +EXPORT_SYMBOL_GPL(iscsi_requeue_task); + +/** * iscsi_data_xmit - xmit any command into the scheduled connection * @conn: iscsi connection * @@ -688,19 +1187,13 @@ static int iscsi_data_xmit(struct iscsi_conn *conn) spin_lock_bh(&conn->session->lock); if (unlikely(conn->suspend_tx)) { - debug_scsi("conn %d Tx suspended!\n", conn->id); + ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); spin_unlock_bh(&conn->session->lock); return -ENODATA; } - if (conn->ctask) { - rc = iscsi_xmit_ctask(conn); - if (rc) - goto again; - } - - if (conn->mtask) { - rc = iscsi_xmit_mtask(conn); + if (conn->task) { + rc = iscsi_xmit_task(conn); if (rc) goto again; } @@ -711,43 +1204,69 @@ 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*))) { - iscsi_prep_mtask(conn, conn->mtask); - list_add_tail(&conn->mtask->running, &conn->mgmt_run_list); - rc = iscsi_xmit_mtask(conn); + while (!list_empty(&conn->mgmtqueue)) { + conn->task = list_entry(conn->mgmtqueue.next, + struct iscsi_task, running); + if (iscsi_prep_mgmt_task(conn, conn->task)) { + __iscsi_put_task(conn->task); + conn->task = NULL; + continue; + } + rc = iscsi_xmit_task(conn); if (rc) goto again; } - /* process command queue */ + /* process pending command queue */ while (!list_empty(&conn->xmitqueue)) { - rc = iscsi_check_cmdsn_window_closed(conn); - if (rc) { - spin_unlock_bh(&conn->session->lock); - return rc; + if (conn->tmf_state == TMF_QUEUED) + break; + + conn->task = list_entry(conn->xmitqueue.next, + struct iscsi_task, running); + if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { + fail_command(conn, conn->task, DID_IMM_RETRY << 16); + continue; } - /* - * iscsi tcp may readd the task to the xmitqueue to send - * write data - */ - conn->ctask = list_entry(conn->xmitqueue.next, - struct iscsi_cmd_task, running); - if (conn->ctask->state == ISCSI_TASK_PENDING) { - iscsi_prep_scsi_cmd_pdu(conn->ctask); - conn->session->tt->init_cmd_task(conn->ctask); + rc = iscsi_prep_scsi_cmd_pdu(conn->task); + if (rc) { + if (rc == -ENOMEM) { + conn->task = NULL; + goto again; + } else + fail_command(conn, conn->task, DID_ABORT << 16); + continue; } - conn->ctask->state = ISCSI_TASK_RUNNING; - list_move_tail(conn->xmitqueue.next, &conn->run_list); - rc = iscsi_xmit_ctask(conn); + rc = iscsi_xmit_task(conn); if (rc) goto again; /* - * we could continuously get new ctask requests so + * we could continuously get new task requests so * 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->task = list_entry(conn->requeue.next, + struct iscsi_task, running); + conn->task->state = ISCSI_TASK_RUNNING; + list_move_tail(conn->requeue.next, &conn->run_list); + rc = iscsi_xmit_task(conn); + if (rc) + goto again; + if (!list_empty(&conn->mgmtqueue)) goto check_mgmt; } spin_unlock_bh(&conn->session->lock); @@ -773,6 +1292,26 @@ static void iscsi_xmitworker(struct work_struct *work) } while (rc >= 0 || rc == -EAGAIN); } +static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, + struct scsi_cmnd *sc) +{ + struct iscsi_task *task; + + if (!__kfifo_get(conn->session->cmdpool.queue, + (void *) &task, sizeof(void *))) + return NULL; + + sc->SCp.phase = conn->session->age; + sc->SCp.ptr = (char *) task; + + atomic_set(&task->refcount, 1); + task->state = ISCSI_TASK_PENDING; + task->conn = conn; + task->sc = sc; + INIT_LIST_HEAD(&task->running); + return task; +} + enum { FAILURE_BAD_HOST = 1, FAILURE_SESSION_FAILED, @@ -782,25 +1321,36 @@ enum { FAILURE_SESSION_TERMINATE, FAILURE_SESSION_IN_RECOVERY, FAILURE_SESSION_RECOVERY_TIMEOUT, + FAILURE_SESSION_LOGGING_OUT, + FAILURE_SESSION_NOT_READY, }; int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) { + struct iscsi_cls_session *cls_session; struct Scsi_Host *host; int reason = 0; struct iscsi_session *session; struct iscsi_conn *conn; - struct iscsi_cmd_task *ctask = NULL; + struct iscsi_task *task = NULL; sc->scsi_done = done; sc->result = 0; sc->SCp.ptr = NULL; host = sc->device->host; - session = iscsi_hostdata(host->hostdata); + spin_unlock(host->host_lock); + cls_session = starget_to_session(scsi_target(sc->device)); + session = cls_session->dd_data; spin_lock(&session->lock); + reason = iscsi_session_chkready(cls_session); + if (reason) { + sc->result = reason; + goto fault; + } + /* * ISCSI_STATE_FAILED is a temp. state. The recovery * code will decide what is best to do with command queued @@ -814,185 +1364,152 @@ 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) + sc->result = DID_TRANSPORT_FAILFAST << 16; + break; + case ISCSI_STATE_TERMINATE: reason = FAILURE_SESSION_TERMINATE; - else + sc->result = DID_NO_CONNECT << 16; + break; + default: reason = FAILURE_SESSION_FREED; + sc->result = DID_NO_CONNECT << 16; + } goto fault; } conn = session->leadconn; if (!conn) { reason = FAILURE_SESSION_FREED; + sc->result = DID_NO_CONNECT << 16; goto fault; } - /* - * We check this here and in data xmit, because if we get to the point - * that this check is hitting the window then we have enough IO in - * flight and enough IO waiting to be transmitted it is better - * to let the scsi/block layer queue up. - */ if (iscsi_check_cmdsn_window_closed(conn)) { reason = FAILURE_WINDOW_CLOSED; goto reject; } - if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask, - sizeof(void*))) { + task = iscsi_alloc_task(conn, sc); + if (!task) { reason = FAILURE_OOM; goto reject; } - sc->SCp.phase = session->age; - sc->SCp.ptr = (char *)ctask; - - atomic_set(&ctask->refcount, 1); - ctask->state = ISCSI_TASK_PENDING; - ctask->mtask = NULL; - ctask->conn = conn; - ctask->sc = sc; - INIT_LIST_HEAD(&ctask->running); + list_add_tail(&task->running, &conn->xmitqueue); + + if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) { + reason = iscsi_prep_scsi_cmd_pdu(task); + if (reason) { + if (reason == -ENOMEM) { + reason = FAILURE_OOM; + goto prepd_reject; + } else { + sc->result = DID_ABORT << 16; + goto prepd_fault; + } + } + if (session->tt->xmit_task(task)) { + reason = FAILURE_SESSION_NOT_READY; + goto prepd_reject; + } + } else + iscsi_conn_queue_work(conn); - list_add_tail(&ctask->running, &conn->xmitqueue); + session->queued_cmdsn++; spin_unlock(&session->lock); - - scsi_queue_work(host, &conn->xmitwork); + spin_lock(host->host_lock); return 0; +prepd_reject: + sc->scsi_done = NULL; + iscsi_complete_command(task); reject: spin_unlock(&session->lock); - debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); - return SCSI_MLQUEUE_HOST_BUSY; - + ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", + sc->cmnd[0], reason); + spin_lock(host->host_lock); + return SCSI_MLQUEUE_TARGET_BUSY; + +prepd_fault: + sc->scsi_done = NULL; + iscsi_complete_command(task); fault: spin_unlock(&session->lock); - printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n", - sc->cmnd[0], reason); - sc->result = (DID_NO_CONNECT << 16); - sc->resid = sc->request_bufflen; - sc->scsi_done(sc); + ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", + sc->cmnd[0], reason); + if (!scsi_bidi_cmnd(sc)) + scsi_set_resid(sc, scsi_bufflen(sc)); + else { + scsi_out(sc)->resid = scsi_out(sc)->length; + scsi_in(sc)->resid = scsi_in(sc)->length; + } + done(sc); + spin_lock(host->host_lock); return 0; } EXPORT_SYMBOL_GPL(iscsi_queuecommand); int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) { - if (depth > ISCSI_MAX_CMD_PER_LUN) - depth = ISCSI_MAX_CMD_PER_LUN; scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); return sdev->queue_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; + struct iscsi_session *session = cls_session->dd_data; 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); } EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); -int iscsi_eh_host_reset(struct scsi_cmnd *sc) +int iscsi_eh_target_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; + struct iscsi_cls_session *cls_session; + struct iscsi_session *session; + struct iscsi_conn *conn; + + cls_session = starget_to_session(scsi_target(sc->device)); + session = cls_session->dd_data; + conn = session->leadconn; + 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); + iscsi_session_printk(KERN_INFO, session, + "failing target reset: Could not log " + "back into target [age %d]\n", + 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"); + ISCSI_DBG_SESSION(session, "wait for relogin\n"); wait_event_interruptible(conn->ehwait, session->state == ISCSI_STATE_TERMINATE || session->state == ISCSI_STATE_LOGGED_IN || @@ -1000,494 +1517,800 @@ 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"); + iscsi_session_printk(KERN_INFO, session, + "target 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); +EXPORT_SYMBOL_GPL(iscsi_eh_target_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; + ISCSI_DBG_SESSION(session, "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_task *task; - ctask->mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, - NULL, 0); - if (!ctask->mtask) { + task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, + NULL, 0); + if (!task) { + spin_unlock_bh(&session->lock); iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - debug_scsi("abort sent failure [itt 0x%x]\n", ctask->itt); + spin_lock_bh(&session->lock); + ISCSI_DBG_SESSION(session, "tmf exec failure\n"); return -EPERM; } - ctask->state = ISCSI_TASK_ABORTING; - - debug_scsi("abort sent [itt 0x%x]\n", ctask->itt); + 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); + ISCSI_DBG_SESSION(session, "tmf set timeout\n"); - 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); - scsi_queue_work(session->host, &conn->xmitwork); + mutex_unlock(&session->eh_mutex); /* * 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 task */ + 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 error) { - int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*); - struct iscsi_mgmt_task *task; + struct iscsi_task *task, *tmp; - debug_scsi("searching %d tasks\n", nr_tasks); + if (conn->task && (conn->task->sc->device->lun == lun || lun == -1)) + conn->task = 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(task, tmp, &conn->xmitqueue, running) { + if (lun == task->sc->device->lun || lun == -1) { + ISCSI_DBG_SESSION(conn->session, + "failing pending sc %p itt 0x%x\n", + task->sc, task->itt); + fail_command(conn, task, error << 16); + } + } - if (task->itt == itt) { - debug_scsi("matched task\n"); - return task; + list_for_each_entry_safe(task, tmp, &conn->requeue, running) { + if (lun == task->sc->device->lun || lun == -1) { + ISCSI_DBG_SESSION(conn->session, + "failing requeued sc %p itt 0x%x\n", + task->sc, task->itt); + fail_command(conn, task, error << 16); } + } - __kfifo_put(fifo, (void*)&task, sizeof(void*)); + /* fail all other running */ + list_for_each_entry_safe(task, tmp, &conn->run_list, running) { + if (lun == task->sc->device->lun || lun == -1) { + ISCSI_DBG_SESSION(conn->session, + "failing in progress sc %p itt 0x%x\n", + task->sc, task->itt); + fail_command(conn, task, error << 16); + } } - return NULL; } -static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask) +void iscsi_suspend_tx(struct iscsi_conn *conn) { - struct iscsi_conn *conn = ctask->conn; - struct iscsi_session *session = conn->session; + struct Scsi_Host *shost = conn->session->host; + struct iscsi_host *ihost = shost_priv(shost); - if (!ctask->mtask) - return -EINVAL; + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); + if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD)) + flush_workqueue(ihost->workq); +} +EXPORT_SYMBOL_GPL(iscsi_suspend_tx); - 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); + if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD)) + iscsi_conn_queue_work(conn); } -/* - * session lock must be held - */ -static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, - int err) +static enum blk_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 blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; - sc = ctask->sc; - if (!sc) + cls_session = starget_to_session(scsi_target(scmd->device)); + session = cls_session->dd_data; + + ISCSI_DBG_SESSION(session, "scsi cmd %p timedout\n", scmd); + + spin_lock(&session->lock); + if (session->state != ISCSI_STATE_LOGGED_IN) { + /* + * We are probably in the middle of iscsi recovery so let + * that complete and handle the error. + */ + rc = BLK_EH_RESET_TIMER; + goto done; + } + + conn = session->leadconn; + if (!conn) { + /* In the middle of shuting down */ + rc = BLK_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 = BLK_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 = BLK_EH_RESET_TIMER; + /* if in the middle of checking the transport then give us more time */ + if (conn->ping_task) + rc = BLK_EH_RESET_TIMER; +done: + spin_unlock(&session->lock); + ISCSI_DBG_SESSION(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? + "timer reset" : "nh"); + return rc; +} + +static void iscsi_check_transport_timeouts(unsigned long data) +{ + struct iscsi_conn *conn = (struct iscsi_conn *)data; + struct iscsi_session *session = conn->session; + unsigned long recv_timeout, next_timeout = 0, last_recv; + + spin_lock(&session->lock); + if (session->state != ISCSI_STATE_LOGGED_IN) + goto done; + + recv_timeout = conn->recv_timeout; + if (!recv_timeout) + goto done; + + recv_timeout *= HZ; + last_recv = conn->last_recv; + if (conn->ping_task && + time_before_eq(conn->last_ping + (conn->ping_timeout * HZ), + jiffies)) { + iscsi_conn_printk(KERN_ERR, conn, "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 (ctask->state != ISCSI_TASK_PENDING) - conn->session->tt->cleanup_cmd_task(conn, ctask); - iscsi_ctask_mtask_cleanup(ctask); + if (time_before_eq(last_recv + recv_timeout, jiffies)) { + /* send a ping to try to provoke some traffic */ + ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); + iscsi_send_nopout(conn, NULL); + next_timeout = conn->last_ping + (conn->ping_timeout * HZ); + } else + next_timeout = last_recv + recv_timeout; - sc->result = err; - sc->resid = sc->request_bufflen; - if (conn->ctask == ctask) - conn->ctask = NULL; - /* release ref from queuecommand */ - __iscsi_put_ctask(ctask); + ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); + mod_timer(&conn->transport_timer, next_timeout); +done: + spin_unlock(&session->lock); +} + +static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, + struct iscsi_tm *hdr) +{ + 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, task->lun, sizeof(hdr->lun)); + hdr->rtt = task->hdr_itt; + hdr->refcmdsn = task->cmdsn; } int iscsi_eh_abort(struct scsi_cmnd *sc) { - struct iscsi_cmd_task *ctask; - struct iscsi_conn *conn; + struct iscsi_cls_session *cls_session; struct iscsi_session *session; - int rc; + struct iscsi_conn *conn; + struct iscsi_task *task; + struct iscsi_tm *hdr; + int rc, age; + cls_session = starget_to_session(scsi_target(sc->device)); + session = cls_session->dd_data; + + mutex_lock(&session->eh_mutex); + spin_lock_bh(&session->lock); /* * if session was ISCSI_STATE_IN_RECOVERY then we may not have * got the command. */ if (!sc->SCp.ptr) { - debug_scsi("sc never reached iscsi layer or it completed.\n"); + ISCSI_DBG_SESSION(session, "sc never reached iscsi layer or " + "it completed.\n"); + spin_unlock_bh(&session->lock); + mutex_unlock(&session->eh_mutex); return SUCCESS; } - ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; - conn = ctask->conn; - session = conn->session; - - conn->eh_abort_cnt++; - debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); - - spin_lock_bh(&session->lock); - /* * 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; - - /* ctask completed before time out */ - if (!ctask->sc) { - debug_scsi("sc completed while abort in progress\n"); - goto success; + 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; } - /* 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; + conn = session->leadconn; + conn->eh_abort_cnt++; + age = session->age; + + task = (struct iscsi_task *)sc->SCp.ptr; + ISCSI_DBG_SESSION(session, "aborting [sc %p itt 0x%x]\n", + sc, task->itt); + + /* task completed before time out */ + if (!task->sc) { + ISCSI_DBG_SESSION(session, "sc completed while abort in " + "progress\n"); + goto success; } - if (ctask->state == ISCSI_TASK_PENDING) { - fail_command(conn, ctask, DID_ABORT << 16); + if (task->state == ISCSI_TASK_PENDING) { + fail_command(conn, task, 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(task, 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); /* - * clean up task if aborted. grab the recv lock as a writer + * stop tx side incase the target had sent a abort rsp but + * the initiator was still writing out data. */ - write_lock_bh(conn->recv_lock); - spin_lock(&session->lock); - fail_command(conn, ctask, DID_ABORT << 16); - spin_unlock(&session->lock); - write_unlock_bh(conn->recv_lock); + iscsi_suspend_tx(conn); /* - * make sure xmit thread is not still touching the - * ctask/scsi_cmnd + * we do not stop the recv side because targets have been + * good and have never sent us a successful tmf response + * then sent more data for the cmd. */ - scsi_flush_work(session->host); + spin_lock(&session->lock); + fail_command(conn, task, DID_ABORT << 16); + conn->tmf_state = TMF_INITIAL; + spin_unlock(&session->lock); + iscsi_start_tx(conn); goto success_unlocked; - case TMABORT_NOT_FOUND: - if (!ctask->sc) { - /* ctask completed before tmf abort response */ - debug_scsi("sc completed while abort in progress\n"); + 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; + /* task completed before tmf abort response */ + ISCSI_DBG_SESSION(session, "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: spin_unlock_bh(&session->lock); success_unlocked: - debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); + ISCSI_DBG_SESSION(session, "abort success [sc %p itt 0x%x]\n", + sc, task->itt); + mutex_unlock(&session->eh_mutex); return SUCCESS; failed: spin_unlock_bh(&session->lock); failed_unlocked: - debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); + ISCSI_DBG_SESSION(session, "abort failed [sc %p itt 0x%x]\n", sc, + task ? task->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 iscsi_cls_session *cls_session; + struct iscsi_session *session; + struct iscsi_conn *conn; + struct iscsi_tm *hdr; + int rc = FAILED; + + cls_session = starget_to_session(scsi_target(sc->device)); + session = cls_session->dd_data; + + ISCSI_DBG_SESSION(session, "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); + + spin_lock_bh(&session->lock); + fail_all_commands(conn, sc->device->lun, DID_ERROR); + conn->tmf_state = TMF_INITIAL; + spin_unlock_bh(&session->lock); + + iscsi_start_tx(conn); + goto done; + +unlock: + spin_unlock_bh(&session->lock); +done: + ISCSI_DBG_SESSION(session, "dev reset result = %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); + + /* 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) return -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[i]); kfree(q->pool); - kfree(items); + kfree(q->queue); } EXPORT_SYMBOL_GPL(iscsi_pool_free); -/* - * iSCSI Session's hostdata organization: +/** + * iscsi_host_add - add host to system + * @shost: scsi host + * @pdev: parent device + * + * This should be called by partial offload and software iscsi drivers + * to add a host to the system. + */ +int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) +{ + if (!shost->can_queue) + shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; + + if (!shost->transportt->eh_timed_out) + shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; + return scsi_add_host(shost, pdev); +} +EXPORT_SYMBOL_GPL(iscsi_host_add); + +/** + * iscsi_host_alloc - allocate a host and driver data + * @sht: scsi host template + * @dd_data_size: driver host data size + * @qdepth: default device queue depth + * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue + * + * This should be called by partial offload and software iscsi drivers. + * To access the driver specific memory use the iscsi_host_priv() macro. + */ +struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, + int dd_data_size, uint16_t qdepth, + bool xmit_can_sleep) +{ + struct Scsi_Host *shost; + struct iscsi_host *ihost; + + shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); + if (!shost) + return NULL; + + if (qdepth == 0) + qdepth = ISCSI_DEF_CMD_PER_LUN; + shost->cmd_per_lun = qdepth; + ihost = shost_priv(shost); + + if (xmit_can_sleep) { + snprintf(ihost->workq_name, sizeof(ihost->workq_name), + "iscsi_q_%d", shost->host_no); + ihost->workq = create_singlethread_workqueue(ihost->workq_name); + if (!ihost->workq) + goto free_host; + } + + spin_lock_init(&ihost->lock); + ihost->state = ISCSI_HOST_SETUP; + ihost->num_sessions = 0; + init_waitqueue_head(&ihost->session_removal_wq); + return shost; + +free_host: + scsi_host_put(shost); + return NULL; +} +EXPORT_SYMBOL_GPL(iscsi_host_alloc); + +static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) +{ + iscsi_session_failure(cls_session, ISCSI_ERR_INVALID_HOST); +} + +/** + * iscsi_host_remove - remove host and sessions + * @shost: scsi host * - * *------------------* <== hostdata_session(host->hostdata) - * | ptr to class sess| - * |------------------| <== iscsi_hostdata(host->hostdata) - * | iscsi_session | - * *------------------* + * If there are any sessions left, this will initiate the removal and wait + * for the completion. */ +void iscsi_host_remove(struct Scsi_Host *shost) +{ + struct iscsi_host *ihost = shost_priv(shost); + unsigned long flags; + + spin_lock_irqsave(&ihost->lock, flags); + ihost->state = ISCSI_HOST_REMOVED; + spin_unlock_irqrestore(&ihost->lock, flags); + + iscsi_host_for_each_session(shost, iscsi_notify_host_removed); + wait_event_interruptible(ihost->session_removal_wq, + ihost->num_sessions == 0); + if (signal_pending(current)) + flush_signals(current); -#define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \ - _sz % sizeof(unsigned long)) + scsi_remove_host(shost); + if (ihost->workq) + destroy_workqueue(ihost->workq); +} +EXPORT_SYMBOL_GPL(iscsi_host_remove); + +void iscsi_host_free(struct Scsi_Host *shost) +{ + struct iscsi_host *ihost = shost_priv(shost); + + kfree(ihost->netdev); + kfree(ihost->hwaddress); + kfree(ihost->initiatorname); + scsi_host_put(shost); +} +EXPORT_SYMBOL_GPL(iscsi_host_free); + +static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) +{ + struct iscsi_host *ihost = shost_priv(shost); + unsigned long flags; + + shost = scsi_host_get(shost); + if (!shost) { + printk(KERN_ERR "Invalid state. Cannot notify host removal " + "of session teardown event because host already " + "removed.\n"); + return; + } -#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) + spin_lock_irqsave(&ihost->lock, flags); + ihost->num_sessions--; + if (ihost->num_sessions == 0) + wake_up(&ihost->session_removal_wq); + spin_unlock_irqrestore(&ihost->lock, flags); + scsi_host_put(shost); +} /** * iscsi_session_setup - create iscsi cls session and host and session - * @scsit: scsi transport template * @iscsit: iscsi transport template - * @cmds_max: scsi host can queue - * @qdepth: scsi host cmds per lun - * @cmd_task_size: LLD ctask private data size - * @mgmt_task_size: LLD mtask private data size + * @shost: scsi host + * @cmds_max: session can queue + * @cmd_task_size: LLD task private data size * @initial_cmdsn: initial CmdSN - * @hostno: host no allocated * * This can be used by software iscsi_transports that allocate * a session per scsi host. - **/ + * + * Callers should set cmds_max to the largest total numer (mgmt + scsi) of + * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks + * for nop handling and login/logout requests. + */ struct iscsi_cls_session * -iscsi_session_setup(struct iscsi_transport *iscsit, - struct scsi_transport_template *scsit, - uint16_t cmds_max, uint16_t qdepth, - int cmd_task_size, int mgmt_task_size, - uint32_t initial_cmdsn, uint32_t *hostno) +iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, + uint16_t cmds_max, int cmd_task_size, + uint32_t initial_cmdsn, unsigned int id) { - struct Scsi_Host *shost; + struct iscsi_host *ihost = shost_priv(shost); struct iscsi_session *session; struct iscsi_cls_session *cls_session; - int cmd_i; + int cmd_i, scsi_cmds, total_cmds = cmds_max; + unsigned long flags; - if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) { - if (qdepth != 0) - printk(KERN_ERR "iscsi: invalid queue depth of %d. " - "Queue depth must be between 1 and %d.\n", - qdepth, ISCSI_MAX_CMD_PER_LUN); - qdepth = ISCSI_DEF_CMD_PER_LUN; + spin_lock_irqsave(&ihost->lock, flags); + if (ihost->state == ISCSI_HOST_REMOVED) { + spin_unlock_irqrestore(&ihost->lock, flags); + return NULL; + } + ihost->num_sessions++; + spin_unlock_irqrestore(&ihost->lock, flags); + + if (!total_cmds) + total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; + /* + * The iscsi layer needs some tasks for nop handling and tmfs, + * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX + * + 1 command for scsi IO. + */ + if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { + printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " + "must be a power of two that is at least %d.\n", + total_cmds, ISCSI_TOTAL_CMDS_MIN); + goto dec_session_count; } - if (cmds_max < 2 || (cmds_max & (cmds_max - 1)) || - cmds_max >= ISCSI_MGMT_ITT_OFFSET) { - if (cmds_max != 0) - printk(KERN_ERR "iscsi: invalid can_queue of %d. " - "can_queue must be a power of 2 and between " - "2 and %d - setting to %d.\n", cmds_max, - ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX); - cmds_max = ISCSI_DEF_XMIT_CMDS_MAX; + if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { + printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " + "must be a power of 2 less than or equal to %d.\n", + cmds_max, ISCSI_TOTAL_CMDS_MAX); + total_cmds = ISCSI_TOTAL_CMDS_MAX; } - shost = scsi_host_alloc(iscsit->host_template, - hostdata_privsize(sizeof(*session))); - if (!shost) - return NULL; + if (!is_power_of_2(total_cmds)) { + printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " + "must be a power of 2.\n", total_cmds); + total_cmds = rounddown_pow_of_two(total_cmds); + if (total_cmds < ISCSI_TOTAL_CMDS_MIN) + return NULL; + printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", + total_cmds); + } + scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; - /* the iscsi layer takes one task for reserve */ - shost->can_queue = cmds_max - 1; - shost->cmd_per_lun = qdepth; - shost->max_id = 1; - shost->max_channel = 0; - shost->max_lun = iscsit->max_lun; - shost->max_cmd_len = iscsit->max_cmd_len; - shost->transportt = scsit; - shost->transportt->create_work_queue = 1; - *hostno = shost->host_no; - - session = iscsi_hostdata(shost->hostdata); - memset(session, 0, sizeof(struct iscsi_session)); + cls_session = iscsi_alloc_session(shost, iscsit, + sizeof(struct iscsi_session)); + if (!cls_session) + goto dec_session_count; + session = cls_session->dd_data; + session->cls_session = cls_session; session->host = shost; session->state = ISCSI_STATE_FREE; - session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; - session->cmds_max = cmds_max; - session->cmdsn = initial_cmdsn; + session->fast_abort = 1; + session->lu_reset_timeout = 15; + session->abort_timeout = 10; + session->scsi_cmds_max = scsi_cmds; + session->cmds_max = total_cmds; + session->queued_cmdsn = session->cmdsn = initial_cmdsn; session->exp_cmdsn = initial_cmdsn + 1; session->max_cmdsn = initial_cmdsn + 1; session->max_r2t = 1; session->tt = iscsit; + mutex_init(&session->eh_mutex); + spin_lock_init(&session->lock); /* initialize SCSI PDU commands pool */ if (iscsi_pool_init(&session->cmdpool, session->cmds_max, (void***)&session->cmds, - cmd_task_size + sizeof(struct iscsi_cmd_task))) + cmd_task_size + sizeof(struct iscsi_task))) goto cmdpool_alloc_fail; /* pre-format cmds pool with ITT */ for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { - struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; + struct iscsi_task *task = session->cmds[cmd_i]; if (cmd_task_size) - ctask->dd_data = &ctask[1]; - ctask->itt = cmd_i; - INIT_LIST_HEAD(&ctask->running); - } - - spin_lock_init(&session->lock); - - /* initialize immediate command pool */ - if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, - (void***)&session->mgmt_cmds, - mgmt_task_size + sizeof(struct iscsi_mgmt_task))) - goto mgmtpool_alloc_fail; - - - /* pre-format immediate cmds pool with ITT */ - for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { - struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; - - if (mgmt_task_size) - mtask->dd_data = &mtask[1]; - mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; - INIT_LIST_HEAD(&mtask->running); + task->dd_data = &task[1]; + task->itt = cmd_i; + INIT_LIST_HEAD(&task->running); } - if (scsi_add_host(shost, NULL)) - goto add_host_fail; - if (!try_module_get(iscsit->owner)) - goto cls_session_fail; + goto module_get_fail; - cls_session = iscsi_create_session(shost, iscsit, 0); - if (!cls_session) - goto module_put; - *(unsigned long*)shost->hostdata = (unsigned long)cls_session; + if (iscsi_add_session(cls_session, id)) + goto cls_session_fail; return cls_session; -module_put: - module_put(iscsit->owner); cls_session_fail: - scsi_remove_host(shost); -add_host_fail: - iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); -mgmtpool_alloc_fail: - iscsi_pool_free(&session->cmdpool, (void**)session->cmds); + module_put(iscsit->owner); +module_get_fail: + iscsi_pool_free(&session->cmdpool); cmdpool_alloc_fail: - scsi_host_put(shost); + iscsi_free_session(cls_session); +dec_session_count: + iscsi_host_dec_session_cnt(shost); return NULL; } EXPORT_SYMBOL_GPL(iscsi_session_setup); /** * iscsi_session_teardown - destroy session, host, and cls_session - * shost: scsi host + * @cls_session: iscsi session * - * This can be used by software iscsi_transports that allocate - * a session per scsi host. - **/ + * The driver must have called iscsi_remove_session before + * calling this. + */ void iscsi_session_teardown(struct iscsi_cls_session *cls_session) { - struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); + struct iscsi_session *session = cls_session->dd_data; struct module *owner = cls_session->transport->owner; + struct Scsi_Host *shost = session->host; - 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->cmdpool); kfree(session->password); kfree(session->password_in); kfree(session->username); kfree(session->username_in); kfree(session->targetname); - kfree(session->hwaddress); kfree(session->initiatorname); + kfree(session->ifacename); iscsi_destroy_session(cls_session); - scsi_host_put(shost); + iscsi_host_dec_session_cnt(shost); module_put(owner); } EXPORT_SYMBOL_GPL(iscsi_session_teardown); @@ -1495,66 +2318,69 @@ EXPORT_SYMBOL_GPL(iscsi_session_teardown); /** * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn * @cls_session: iscsi_cls_session + * @dd_size: private driver data size * @conn_idx: cid - **/ + */ struct iscsi_cls_conn * -iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx) +iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, + uint32_t conn_idx) { - struct iscsi_session *session = class_to_transport_session(cls_session); + struct iscsi_session *session = cls_session->dd_data; struct iscsi_conn *conn; struct iscsi_cls_conn *cls_conn; char *data; - cls_conn = iscsi_create_conn(cls_session, conn_idx); + cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, + conn_idx); if (!cls_conn) return NULL; conn = cls_conn->dd_data; - memset(conn, 0, sizeof(*conn)); + memset(conn, 0, sizeof(*conn) + dd_size); + conn->dd_data = cls_conn->dd_data + sizeof(*conn); conn->session = session; conn->cls_conn = cls_conn; 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 */ + /* allocate login_task used for the login/text sequences */ spin_lock_bh(&session->lock); - if (!__kfifo_get(session->mgmtpool.queue, - (void*)&conn->login_mtask, + if (!__kfifo_get(session->cmdpool.queue, + (void*)&conn->login_task, sizeof(void*))) { spin_unlock_bh(&session->lock); - goto login_mtask_alloc_fail; + goto login_task_alloc_fail; } spin_unlock_bh(&session->lock); - data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL); + data = (char *) __get_free_pages(GFP_KERNEL, + get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); if (!data) - goto login_mtask_data_alloc_fail; - conn->login_mtask->data = conn->data = data; + goto login_task_data_alloc_fail; + conn->login_task->data = conn->data = data; - init_timer(&conn->tmabort_timer); + init_timer(&conn->tmf_timer); init_waitqueue_head(&conn->ehwait); return cls_conn; -login_mtask_data_alloc_fail: - __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, +login_task_data_alloc_fail: + __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, sizeof(void*)); -login_mtask_alloc_fail: - kfifo_free(conn->mgmtqueue); -mgmtqueue_alloc_fail: +login_task_alloc_fail: iscsi_destroy_conn(cls_conn); return NULL; } @@ -1573,8 +2399,9 @@ 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) { /* @@ -1597,9 +2424,10 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) } spin_unlock_irqrestore(session->host->host_lock, flags); msleep_interruptible(500); - printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d " - "host_failed %d\n", session->host->host_busy, - session->host->host_failed); + iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " + "host_busy %d host_failed %d\n", + session->host->host_busy, + session->host->host_failed); /* * force eh_abort() to unblock */ @@ -1607,22 +2435,18 @@ 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); + free_pages((unsigned long) conn->data, + get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); kfree(conn->persistent_address); - __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, + __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, sizeof(void*)); - if (session->leadconn == conn) { + if (session->leadconn == conn) session->leadconn = NULL; - /* no connections exits.. reset sequencing */ - session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1; - } spin_unlock_bh(&session->lock); - kfifo_free(conn->mgmtqueue); - iscsi_destroy_conn(cls_conn); } EXPORT_SYMBOL_GPL(iscsi_conn_teardown); @@ -1633,21 +2457,41 @@ int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) struct iscsi_session *session = conn->session; if (!session) { - printk(KERN_ERR "iscsi: can't start unbound connection\n"); + iscsi_conn_printk(KERN_ERR, conn, + "can't start unbound connection\n"); return -EPERM; } if ((session->imm_data_en || !session->initial_r2t_en) && session->first_burst > session->max_burst) { - printk("iscsi: invalid burst lengths: " - "first_burst %d max_burst %d\n", - session->first_burst, session->max_burst); + iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " + "first_burst %d max_burst %d\n", + session->first_burst, session->max_burst); return -EINVAL; } + if (conn->ping_timeout && !conn->recv_timeout) { + iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " + "zero. Using 5 seconds\n."); + conn->recv_timeout = 5; + } + + if (conn->recv_timeout && !conn->ping_timeout) { + iscsi_conn_printk(KERN_ERR, conn, "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: @@ -1656,13 +2500,11 @@ 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); - - iscsi_unblock_session(session_to_cls(session)); - wake_up(&conn->ehwait); - return 0; + if (session->age == 16) + session->age = 0; + break; case STOP_CONN_TERM: conn->stop_stage = 0; break; @@ -1671,6 +2513,8 @@ int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) } spin_unlock_bh(&session->lock); + iscsi_unblock_session(session->cls_session); + wake_up(&conn->ehwait); return 0; } EXPORT_SYMBOL_GPL(iscsi_conn_start); @@ -1678,51 +2522,25 @@ EXPORT_SYMBOL_GPL(iscsi_conn_start); static void flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) { - struct iscsi_mgmt_task *mtask, *tmp; + struct iscsi_task *task, *tmp; /* handle pending */ - while (__kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) { - if (mtask == conn->login_mtask) - continue; - debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt); - __kfifo_put(session->mgmtpool.queue, (void*)&mtask, - sizeof(void*)); + list_for_each_entry_safe(task, tmp, &conn->mgmtqueue, running) { + ISCSI_DBG_SESSION(session, "flushing pending mgmt task " + "itt 0x%x\n", task->itt); + /* release ref from prep task */ + __iscsi_put_task(task); } /* 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*)); - } - - 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); + list_for_each_entry_safe(task, tmp, &conn->mgmt_run_list, running) { + ISCSI_DBG_SESSION(session, "flushing running mgmt task " + "itt 0x%x\n", task->itt); + /* release ref from prep task */ + __iscsi_put_task(task); } - /* 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; + conn->task = NULL; } static void iscsi_start_session_recovery(struct iscsi_session *session, @@ -1730,9 +2548,13 @@ static void iscsi_start_session_recovery(struct iscsi_session *session, { 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) { spin_unlock_bh(&session->lock); + mutex_unlock(&session->eh_mutex); return; } @@ -1749,14 +2571,9 @@ static void iscsi_start_session_recovery(struct iscsi_session *session, old_stop_stage = conn->stop_stage; conn->stop_stage = flag; conn->c_stage = ISCSI_CONN_STOPPED; - set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); spin_unlock_bh(&session->lock); - scsi_flush_work(session->host); - - write_lock_bh(conn->recv_lock); - set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); - write_unlock_bh(conn->recv_lock); + iscsi_suspend_tx(conn); /* * for connection level recovery we should not calculate * header digest. conn->hdr_size used for optimization @@ -1768,8 +2585,8 @@ static void iscsi_start_session_recovery(struct iscsi_session *session, conn->datadgst_en = 0; if (session->state == ISCSI_STATE_IN_RECOVERY && old_stop_stage != STOP_CONN_RECOVER) { - debug_scsi("blocking session\n"); - iscsi_block_session(session_to_cls(session)); + ISCSI_DBG_SESSION(session, "blocking session\n"); + iscsi_block_session(session->cls_session); } } @@ -1777,9 +2594,13 @@ static void iscsi_start_session_recovery(struct iscsi_session *session, * flush queues. */ spin_lock_bh(&session->lock); - fail_all_commands(conn); + if (flag == STOP_CONN_RECOVER) + fail_all_commands(conn, -1, DID_TRANSPORT_DISRUPTED); + else + fail_all_commands(conn, -1, DID_ERROR); flush_control_queues(session, conn); spin_unlock_bh(&session->lock); + mutex_unlock(&session->eh_mutex); } void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) @@ -1793,7 +2614,8 @@ void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) iscsi_start_session_recovery(session, conn, flag); break; default: - printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag); + iscsi_conn_printk(KERN_ERR, conn, + "invalid stop flag %d\n", flag); } } EXPORT_SYMBOL_GPL(iscsi_conn_stop); @@ -1801,7 +2623,7 @@ EXPORT_SYMBOL_GPL(iscsi_conn_stop); int iscsi_conn_bind(struct iscsi_cls_session *cls_session, struct iscsi_cls_conn *cls_conn, int is_leading) { - struct iscsi_session *session = class_to_transport_session(cls_session); + struct iscsi_session *session = cls_session->dd_data; struct iscsi_conn *conn = cls_conn->dd_data; spin_lock_bh(&session->lock); @@ -1827,6 +2649,21 @@ 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; @@ -1925,6 +2762,14 @@ int iscsi_set_param(struct iscsi_cls_conn *cls_conn, if (!conn->persistent_address) return -ENOMEM; break; + case ISCSI_PARAM_IFACE_NAME: + if (!session->ifacename) + session->ifacename = kstrdup(buf, GFP_KERNEL); + break; + case ISCSI_PARAM_INITIATOR_NAME: + if (!session->initiatorname) + session->initiatorname = kstrdup(buf, GFP_KERNEL); + break; default: return -ENOSYS; } @@ -1936,11 +2781,19 @@ EXPORT_SYMBOL_GPL(iscsi_set_param); int iscsi_session_get_param(struct iscsi_cls_session *cls_session, enum iscsi_param param, char *buf) { - struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); + struct iscsi_session *session = cls_session->dd_data; 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; @@ -1983,6 +2836,15 @@ int iscsi_session_get_param(struct iscsi_cls_session *cls_session, case ISCSI_PARAM_PASSWORD_IN: len = sprintf(buf, "%s\n", session->password_in); break; + case ISCSI_PARAM_IFACE_NAME: + len = sprintf(buf, "%s\n", session->ifacename); + break; + case ISCSI_PARAM_INITIATOR_NAME: + if (!session->initiatorname) + len = sprintf(buf, "%s\n", "unknown"); + else + len = sprintf(buf, "%s\n", session->initiatorname); + break; default: return -ENOSYS; } @@ -1998,6 +2860,12 @@ 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; @@ -2036,23 +2904,35 @@ EXPORT_SYMBOL_GPL(iscsi_conn_get_param); int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, char *buf) { - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); + struct iscsi_host *ihost = shost_priv(shost); int len; switch (param) { + case ISCSI_HOST_PARAM_NETDEV_NAME: + if (!ihost->netdev) + len = sprintf(buf, "%s\n", "default"); + else + len = sprintf(buf, "%s\n", ihost->netdev); + break; case ISCSI_HOST_PARAM_HWADDRESS: - if (!session->hwaddress) + if (!ihost->hwaddress) len = sprintf(buf, "%s\n", "default"); else - len = sprintf(buf, "%s\n", session->hwaddress); + len = sprintf(buf, "%s\n", ihost->hwaddress); break; case ISCSI_HOST_PARAM_INITIATOR_NAME: - if (!session->initiatorname) + if (!ihost->initiatorname) len = sprintf(buf, "%s\n", "unknown"); else - len = sprintf(buf, "%s\n", session->initiatorname); + len = sprintf(buf, "%s\n", ihost->initiatorname); + break; + case ISCSI_HOST_PARAM_IPADDRESS: + if (!strlen(ihost->local_address)) + len = sprintf(buf, "%s\n", "unknown"); + else + len = sprintf(buf, "%s\n", + ihost->local_address); break; - default: return -ENOSYS; } @@ -2064,16 +2944,20 @@ EXPORT_SYMBOL_GPL(iscsi_host_get_param); int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, char *buf, int buflen) { - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); + struct iscsi_host *ihost = shost_priv(shost); switch (param) { + case ISCSI_HOST_PARAM_NETDEV_NAME: + if (!ihost->netdev) + ihost->netdev = kstrdup(buf, GFP_KERNEL); + break; case ISCSI_HOST_PARAM_HWADDRESS: - if (!session->hwaddress) - session->hwaddress = kstrdup(buf, GFP_KERNEL); + if (!ihost->hwaddress) + ihost->hwaddress = kstrdup(buf, GFP_KERNEL); break; case ISCSI_HOST_PARAM_INITIATOR_NAME: - if (!session->initiatorname) - session->initiatorname = kstrdup(buf, GFP_KERNEL); + if (!ihost->initiatorname) + ihost->initiatorname = kstrdup(buf, GFP_KERNEL); break; default: return -ENOSYS;