| /******************************************************************************* |
| * This file contains the iSCSI Target specific utility functions. |
| * |
| * (c) Copyright 2007-2013 Datera, Inc. |
| * |
| * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| ******************************************************************************/ |
| |
| #include <linux/list.h> |
| #include <linux/sched/signal.h> |
| #include <net/ipv6.h> /* ipv6_addr_equal() */ |
| #include <scsi/scsi_tcq.h> |
| #include <scsi/iscsi_proto.h> |
| #include <target/target_core_base.h> |
| #include <target/target_core_fabric.h> |
| #include <target/iscsi/iscsi_transport.h> |
| |
| #include <target/iscsi/iscsi_target_core.h> |
| #include "iscsi_target_parameters.h" |
| #include "iscsi_target_seq_pdu_list.h" |
| #include "iscsi_target_datain_values.h" |
| #include "iscsi_target_erl0.h" |
| #include "iscsi_target_erl1.h" |
| #include "iscsi_target_erl2.h" |
| #include "iscsi_target_tpg.h" |
| #include "iscsi_target_util.h" |
| #include "iscsi_target.h" |
| |
| #define PRINT_BUFF(buff, len) \ |
| { \ |
| int zzz; \ |
| \ |
| pr_debug("%d:\n", __LINE__); \ |
| for (zzz = 0; zzz < len; zzz++) { \ |
| if (zzz % 16 == 0) { \ |
| if (zzz) \ |
| pr_debug("\n"); \ |
| pr_debug("%4i: ", zzz); \ |
| } \ |
| pr_debug("%02x ", (unsigned char) (buff)[zzz]); \ |
| } \ |
| if ((len + 1) % 16) \ |
| pr_debug("\n"); \ |
| } |
| |
| extern struct list_head g_tiqn_list; |
| extern spinlock_t tiqn_lock; |
| |
| int iscsit_add_r2t_to_list( |
| struct iscsi_cmd *cmd, |
| u32 offset, |
| u32 xfer_len, |
| int recovery, |
| u32 r2t_sn) |
| { |
| struct iscsi_r2t *r2t; |
| |
| lockdep_assert_held(&cmd->r2t_lock); |
| |
| r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC); |
| if (!r2t) { |
| pr_err("Unable to allocate memory for struct iscsi_r2t.\n"); |
| return -1; |
| } |
| INIT_LIST_HEAD(&r2t->r2t_list); |
| |
| r2t->recovery_r2t = recovery; |
| r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn; |
| r2t->offset = offset; |
| r2t->xfer_len = xfer_len; |
| list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list); |
| spin_unlock_bh(&cmd->r2t_lock); |
| |
| iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); |
| |
| spin_lock_bh(&cmd->r2t_lock); |
| return 0; |
| } |
| |
| struct iscsi_r2t *iscsit_get_r2t_for_eos( |
| struct iscsi_cmd *cmd, |
| u32 offset, |
| u32 length) |
| { |
| struct iscsi_r2t *r2t; |
| |
| spin_lock_bh(&cmd->r2t_lock); |
| list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { |
| if ((r2t->offset <= offset) && |
| (r2t->offset + r2t->xfer_len) >= (offset + length)) { |
| spin_unlock_bh(&cmd->r2t_lock); |
| return r2t; |
| } |
| } |
| spin_unlock_bh(&cmd->r2t_lock); |
| |
| pr_err("Unable to locate R2T for Offset: %u, Length:" |
| " %u\n", offset, length); |
| return NULL; |
| } |
| |
| struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd) |
| { |
| struct iscsi_r2t *r2t; |
| |
| spin_lock_bh(&cmd->r2t_lock); |
| list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { |
| if (!r2t->sent_r2t) { |
| spin_unlock_bh(&cmd->r2t_lock); |
| return r2t; |
| } |
| } |
| spin_unlock_bh(&cmd->r2t_lock); |
| |
| pr_err("Unable to locate next R2T to send for ITT:" |
| " 0x%08x.\n", cmd->init_task_tag); |
| return NULL; |
| } |
| |
| void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd) |
| { |
| lockdep_assert_held(&cmd->r2t_lock); |
| |
| list_del(&r2t->r2t_list); |
| kmem_cache_free(lio_r2t_cache, r2t); |
| } |
| |
| void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd) |
| { |
| struct iscsi_r2t *r2t, *r2t_tmp; |
| |
| spin_lock_bh(&cmd->r2t_lock); |
| list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list) |
| iscsit_free_r2t(r2t, cmd); |
| spin_unlock_bh(&cmd->r2t_lock); |
| } |
| |
| static int iscsit_wait_for_tag(struct se_session *se_sess, int state, int *cpup) |
| { |
| int tag = -1; |
| DEFINE_SBQ_WAIT(wait); |
| struct sbq_wait_state *ws; |
| struct sbitmap_queue *sbq; |
| |
| if (state == TASK_RUNNING) |
| return tag; |
| |
| sbq = &se_sess->sess_tag_pool; |
| ws = &sbq->ws[0]; |
| for (;;) { |
| sbitmap_prepare_to_wait(sbq, ws, &wait, state); |
| if (signal_pending_state(state, current)) |
| break; |
| tag = sbitmap_queue_get(sbq, cpup); |
| if (tag >= 0) |
| break; |
| schedule(); |
| } |
| |
| sbitmap_finish_wait(sbq, ws, &wait); |
| return tag; |
| } |
| |
| /* |
| * May be called from software interrupt (timer) context for allocating |
| * iSCSI NopINs. |
| */ |
| struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state) |
| { |
| struct iscsi_cmd *cmd; |
| struct se_session *se_sess = conn->sess->se_sess; |
| int size, tag, cpu; |
| |
| tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); |
| if (tag < 0) |
| tag = iscsit_wait_for_tag(se_sess, state, &cpu); |
| if (tag < 0) |
| return NULL; |
| |
| size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size; |
| cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size)); |
| memset(cmd, 0, size); |
| |
| cmd->se_cmd.map_tag = tag; |
| cmd->se_cmd.map_cpu = cpu; |
| cmd->conn = conn; |
| cmd->data_direction = DMA_NONE; |
| INIT_LIST_HEAD(&cmd->i_conn_node); |
| INIT_LIST_HEAD(&cmd->datain_list); |
| INIT_LIST_HEAD(&cmd->cmd_r2t_list); |
| spin_lock_init(&cmd->datain_lock); |
| spin_lock_init(&cmd->dataout_timeout_lock); |
| spin_lock_init(&cmd->istate_lock); |
| spin_lock_init(&cmd->error_lock); |
| spin_lock_init(&cmd->r2t_lock); |
| timer_setup(&cmd->dataout_timer, iscsit_handle_dataout_timeout, 0); |
| |
| return cmd; |
| } |
| EXPORT_SYMBOL(iscsit_allocate_cmd); |
| |
| struct iscsi_seq *iscsit_get_seq_holder_for_datain( |
| struct iscsi_cmd *cmd, |
| u32 seq_send_order) |
| { |
| u32 i; |
| |
| for (i = 0; i < cmd->seq_count; i++) |
| if (cmd->seq_list[i].seq_send_order == seq_send_order) |
| return &cmd->seq_list[i]; |
| |
| return NULL; |
| } |
| |
| struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd) |
| { |
| u32 i; |
| |
| if (!cmd->seq_list) { |
| pr_err("struct iscsi_cmd->seq_list is NULL!\n"); |
| return NULL; |
| } |
| |
| for (i = 0; i < cmd->seq_count; i++) { |
| if (cmd->seq_list[i].type != SEQTYPE_NORMAL) |
| continue; |
| if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) { |
| cmd->seq_send_order++; |
| return &cmd->seq_list[i]; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| struct iscsi_r2t *iscsit_get_holder_for_r2tsn( |
| struct iscsi_cmd *cmd, |
| u32 r2t_sn) |
| { |
| struct iscsi_r2t *r2t; |
| |
| spin_lock_bh(&cmd->r2t_lock); |
| list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { |
| if (r2t->r2t_sn == r2t_sn) { |
| spin_unlock_bh(&cmd->r2t_lock); |
| return r2t; |
| } |
| } |
| spin_unlock_bh(&cmd->r2t_lock); |
| |
| return NULL; |
| } |
| |
| static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn) |
| { |
| u32 max_cmdsn; |
| int ret; |
| |
| /* |
| * This is the proper method of checking received CmdSN against |
| * ExpCmdSN and MaxCmdSN values, as well as accounting for out |
| * or order CmdSNs due to multiple connection sessions and/or |
| * CRC failures. |
| */ |
| max_cmdsn = atomic_read(&sess->max_cmd_sn); |
| if (iscsi_sna_gt(cmdsn, max_cmdsn)) { |
| pr_err("Received CmdSN: 0x%08x is greater than" |
| " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn); |
| ret = CMDSN_MAXCMDSN_OVERRUN; |
| |
| } else if (cmdsn == sess->exp_cmd_sn) { |
| sess->exp_cmd_sn++; |
| pr_debug("Received CmdSN matches ExpCmdSN," |
| " incremented ExpCmdSN to: 0x%08x\n", |
| sess->exp_cmd_sn); |
| ret = CMDSN_NORMAL_OPERATION; |
| |
| } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) { |
| pr_debug("Received CmdSN: 0x%08x is greater" |
| " than ExpCmdSN: 0x%08x, not acknowledging.\n", |
| cmdsn, sess->exp_cmd_sn); |
| ret = CMDSN_HIGHER_THAN_EXP; |
| |
| } else { |
| pr_err("Received CmdSN: 0x%08x is less than" |
| " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn, |
| sess->exp_cmd_sn); |
| ret = CMDSN_LOWER_THAN_EXP; |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Commands may be received out of order if MC/S is in use. |
| * Ensure they are executed in CmdSN order. |
| */ |
| int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, |
| unsigned char *buf, __be32 cmdsn) |
| { |
| int ret, cmdsn_ret; |
| bool reject = false; |
| u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES; |
| |
| mutex_lock(&conn->sess->cmdsn_mutex); |
| |
| cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn)); |
| switch (cmdsn_ret) { |
| case CMDSN_NORMAL_OPERATION: |
| ret = iscsit_execute_cmd(cmd, 0); |
| if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list)) |
| iscsit_execute_ooo_cmdsns(conn->sess); |
| else if (ret < 0) { |
| reject = true; |
| ret = CMDSN_ERROR_CANNOT_RECOVER; |
| } |
| break; |
| case CMDSN_HIGHER_THAN_EXP: |
| ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn)); |
| if (ret < 0) { |
| reject = true; |
| ret = CMDSN_ERROR_CANNOT_RECOVER; |
| break; |
| } |
| ret = CMDSN_HIGHER_THAN_EXP; |
| break; |
| case CMDSN_LOWER_THAN_EXP: |
| case CMDSN_MAXCMDSN_OVERRUN: |
| default: |
| cmd->i_state = ISTATE_REMOVE; |
| iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); |
| /* |
| * Existing callers for iscsit_sequence_cmd() will silently |
| * ignore commands with CMDSN_LOWER_THAN_EXP, so force this |
| * return for CMDSN_MAXCMDSN_OVERRUN as well.. |
| */ |
| ret = CMDSN_LOWER_THAN_EXP; |
| break; |
| } |
| mutex_unlock(&conn->sess->cmdsn_mutex); |
| |
| if (reject) |
| iscsit_reject_cmd(cmd, reason, buf); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(iscsit_sequence_cmd); |
| |
| int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf) |
| { |
| struct iscsi_conn *conn = cmd->conn; |
| struct se_cmd *se_cmd = &cmd->se_cmd; |
| struct iscsi_data *hdr = (struct iscsi_data *) buf; |
| u32 payload_length = ntoh24(hdr->dlength); |
| |
| if (conn->sess->sess_ops->InitialR2T) { |
| pr_err("Received unexpected unsolicited data" |
| " while InitialR2T=Yes, protocol error.\n"); |
| transport_send_check_condition_and_sense(se_cmd, |
| TCM_UNEXPECTED_UNSOLICITED_DATA, 0); |
| return -1; |
| } |
| |
| if ((cmd->first_burst_len + payload_length) > |
| conn->sess->sess_ops->FirstBurstLength) { |
| pr_err("Total %u bytes exceeds FirstBurstLength: %u" |
| " for this Unsolicited DataOut Burst.\n", |
| (cmd->first_burst_len + payload_length), |
| conn->sess->sess_ops->FirstBurstLength); |
| transport_send_check_condition_and_sense(se_cmd, |
| TCM_INCORRECT_AMOUNT_OF_DATA, 0); |
| return -1; |
| } |
| |
| if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) |
| return 0; |
| |
| if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) && |
| ((cmd->first_burst_len + payload_length) != |
| conn->sess->sess_ops->FirstBurstLength)) { |
| pr_err("Unsolicited non-immediate data received %u" |
| " does not equal FirstBurstLength: %u, and does" |
| " not equal ExpXferLen %u.\n", |
| (cmd->first_burst_len + payload_length), |
| conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length); |
| transport_send_check_condition_and_sense(se_cmd, |
| TCM_INCORRECT_AMOUNT_OF_DATA, 0); |
| return -1; |
| } |
| return 0; |
| } |
| |
| struct iscsi_cmd *iscsit_find_cmd_from_itt( |
| struct iscsi_conn *conn, |
| itt_t init_task_tag) |
| { |
| struct iscsi_cmd *cmd; |
| |
| spin_lock_bh(&conn->cmd_lock); |
| list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { |
| if (cmd->init_task_tag == init_task_tag) { |
| spin_unlock_bh(&conn->cmd_lock); |
| return cmd; |
| } |
| } |
| spin_unlock_bh(&conn->cmd_lock); |
| |
| pr_err("Unable to locate ITT: 0x%08x on CID: %hu", |
| init_task_tag, conn->cid); |
| return NULL; |
| } |
| EXPORT_SYMBOL(iscsit_find_cmd_from_itt); |
| |
| struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump( |
| struct iscsi_conn *conn, |
| itt_t init_task_tag, |
| u32 length) |
| { |
| struct iscsi_cmd *cmd; |
| |
| spin_lock_bh(&conn->cmd_lock); |
| list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { |
| if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) |
| continue; |
| if (cmd->init_task_tag == init_task_tag) { |
| spin_unlock_bh(&conn->cmd_lock); |
| return cmd; |
| } |
| } |
| spin_unlock_bh(&conn->cmd_lock); |
| |
| pr_err("Unable to locate ITT: 0x%08x on CID: %hu," |
| " dumping payload\n", init_task_tag, conn->cid); |
| if (length) |
| iscsit_dump_data_payload(conn, length, 1); |
| |
| return NULL; |
| } |
| EXPORT_SYMBOL(iscsit_find_cmd_from_itt_or_dump); |
| |
| struct iscsi_cmd *iscsit_find_cmd_from_ttt( |
| struct iscsi_conn *conn, |
| u32 targ_xfer_tag) |
| { |
| struct iscsi_cmd *cmd = NULL; |
| |
| spin_lock_bh(&conn->cmd_lock); |
| list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { |
| if (cmd->targ_xfer_tag == targ_xfer_tag) { |
| spin_unlock_bh(&conn->cmd_lock); |
| return cmd; |
| } |
| } |
| spin_unlock_bh(&conn->cmd_lock); |
| |
| pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n", |
| targ_xfer_tag, conn->cid); |
| return NULL; |
| } |
| |
| int iscsit_find_cmd_for_recovery( |
| struct iscsi_session *sess, |
| struct iscsi_cmd **cmd_ptr, |
| struct iscsi_conn_recovery **cr_ptr, |
| itt_t init_task_tag) |
| { |
| struct iscsi_cmd *cmd = NULL; |
| struct iscsi_conn_recovery *cr; |
| /* |
| * Scan through the inactive connection recovery list's command list. |
| * If init_task_tag matches the command is still alligent. |
| */ |
| spin_lock(&sess->cr_i_lock); |
| list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { |
| spin_lock(&cr->conn_recovery_cmd_lock); |
| list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { |
| if (cmd->init_task_tag == init_task_tag) { |
| spin_unlock(&cr->conn_recovery_cmd_lock); |
| spin_unlock(&sess->cr_i_lock); |
| |
| *cr_ptr = cr; |
| *cmd_ptr = cmd; |
| return -2; |
| } |
| } |
| spin_unlock(&cr->conn_recovery_cmd_lock); |
| } |
| spin_unlock(&sess->cr_i_lock); |
| /* |
| * Scan through the active connection recovery list's command list. |
| * If init_task_tag matches the command is ready to be reassigned. |
| */ |
| spin_lock(&sess->cr_a_lock); |
| list_for_each_entry(cr, &sess->cr_active_list, cr_list) { |
| spin_lock(&cr->conn_recovery_cmd_lock); |
| list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { |
| if (cmd->init_task_tag == init_task_tag) { |
| spin_unlock(&cr->conn_recovery_cmd_lock); |
| spin_unlock(&sess->cr_a_lock); |
| |
| *cr_ptr = cr; |
| *cmd_ptr = cmd; |
| return 0; |
| } |
| } |
| spin_unlock(&cr->conn_recovery_cmd_lock); |
| } |
| spin_unlock(&sess->cr_a_lock); |
| |
| return -1; |
| } |
| |
| void iscsit_add_cmd_to_immediate_queue( |
| struct iscsi_cmd *cmd, |
| struct iscsi_conn *conn, |
| u8 state) |
| { |
| struct iscsi_queue_req *qr; |
| |
| qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); |
| if (!qr) { |
| pr_err("Unable to allocate memory for" |
| " struct iscsi_queue_req\n"); |
| return; |
| } |
| INIT_LIST_HEAD(&qr->qr_list); |
| qr->cmd = cmd; |
| qr->state = state; |
| |
| spin_lock_bh(&conn->immed_queue_lock); |
| list_add_tail(&qr->qr_list, &conn->immed_queue_list); |
| atomic_inc(&cmd->immed_queue_count); |
| atomic_set(&conn->check_immediate_queue, 1); |
| spin_unlock_bh(&conn->immed_queue_lock); |
| |
| wake_up(&conn->queues_wq); |
| } |
| EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue); |
| |
| struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn) |
| { |
| struct iscsi_queue_req *qr; |
| |
| spin_lock_bh(&conn->immed_queue_lock); |
| if (list_empty(&conn->immed_queue_list)) { |
| spin_unlock_bh(&conn->immed_queue_lock); |
| return NULL; |
| } |
| qr = list_first_entry(&conn->immed_queue_list, |
| struct iscsi_queue_req, qr_list); |
| |
| list_del(&qr->qr_list); |
| if (qr->cmd) |
| atomic_dec(&qr->cmd->immed_queue_count); |
| spin_unlock_bh(&conn->immed_queue_lock); |
| |
| return qr; |
| } |
| |
| static void iscsit_remove_cmd_from_immediate_queue( |
| struct iscsi_cmd *cmd, |
| struct iscsi_conn *conn) |
| { |
| struct iscsi_queue_req *qr, *qr_tmp; |
| |
| spin_lock_bh(&conn->immed_queue_lock); |
| if (!atomic_read(&cmd->immed_queue_count)) { |
| spin_unlock_bh(&conn->immed_queue_lock); |
| return; |
| } |
| |
| list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { |
| if (qr->cmd != cmd) |
| continue; |
| |
| atomic_dec(&qr->cmd->immed_queue_count); |
| list_del(&qr->qr_list); |
| kmem_cache_free(lio_qr_cache, qr); |
| } |
| spin_unlock_bh(&conn->immed_queue_lock); |
| |
| if (atomic_read(&cmd->immed_queue_count)) { |
| pr_err("ITT: 0x%08x immed_queue_count: %d\n", |
| cmd->init_task_tag, |
| atomic_read(&cmd->immed_queue_count)); |
| } |
| } |
| |
| int iscsit_add_cmd_to_response_queue( |
| struct iscsi_cmd *cmd, |
| struct iscsi_conn *conn, |
| u8 state) |
| { |
| struct iscsi_queue_req *qr; |
| |
| qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); |
| if (!qr) { |
| pr_err("Unable to allocate memory for" |
| " struct iscsi_queue_req\n"); |
| return -ENOMEM; |
| } |
| INIT_LIST_HEAD(&qr->qr_list); |
| qr->cmd = cmd; |
| qr->state = state; |
| |
| spin_lock_bh(&conn->response_queue_lock); |
| list_add_tail(&qr->qr_list, &conn->response_queue_list); |
| atomic_inc(&cmd->response_queue_count); |
| spin_unlock_bh(&conn->response_queue_lock); |
| |
| wake_up(&conn->queues_wq); |
| return 0; |
| } |
| |
| struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn) |
| { |
| struct iscsi_queue_req *qr; |
| |
| spin_lock_bh(&conn->response_queue_lock); |
| if (list_empty(&conn->response_queue_list)) { |
| spin_unlock_bh(&conn->response_queue_lock); |
| return NULL; |
| } |
| |
| qr = list_first_entry(&conn->response_queue_list, |
| struct iscsi_queue_req, qr_list); |
| |
| list_del(&qr->qr_list); |
| if (qr->cmd) |
| atomic_dec(&qr->cmd->response_queue_count); |
| spin_unlock_bh(&conn->response_queue_lock); |
| |
| return qr; |
| } |
| |
| static void iscsit_remove_cmd_from_response_queue( |
| struct iscsi_cmd *cmd, |
| struct iscsi_conn *conn) |
| { |
| struct iscsi_queue_req *qr, *qr_tmp; |
| |
| spin_lock_bh(&conn->response_queue_lock); |
| if (!atomic_read(&cmd->response_queue_count)) { |
| spin_unlock_bh(&conn->response_queue_lock); |
| return; |
| } |
| |
| list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, |
| qr_list) { |
| if (qr->cmd != cmd) |
| continue; |
| |
| atomic_dec(&qr->cmd->response_queue_count); |
| list_del(&qr->qr_list); |
| kmem_cache_free(lio_qr_cache, qr); |
| } |
| spin_unlock_bh(&conn->response_queue_lock); |
| |
| if (atomic_read(&cmd->response_queue_count)) { |
| pr_err("ITT: 0x%08x response_queue_count: %d\n", |
| cmd->init_task_tag, |
| atomic_read(&cmd->response_queue_count)); |
| } |
| } |
| |
| bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn) |
| { |
| bool empty; |
| |
| spin_lock_bh(&conn->immed_queue_lock); |
| empty = list_empty(&conn->immed_queue_list); |
| spin_unlock_bh(&conn->immed_queue_lock); |
| |
| if (!empty) |
| return empty; |
| |
| spin_lock_bh(&conn->response_queue_lock); |
| empty = list_empty(&conn->response_queue_list); |
| spin_unlock_bh(&conn->response_queue_lock); |
| |
| return empty; |
| } |
| |
| void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn) |
| { |
| struct iscsi_queue_req *qr, *qr_tmp; |
| |
| spin_lock_bh(&conn->immed_queue_lock); |
| list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { |
| list_del(&qr->qr_list); |
| if (qr->cmd) |
| atomic_dec(&qr->cmd->immed_queue_count); |
| |
| kmem_cache_free(lio_qr_cache, qr); |
| } |
| spin_unlock_bh(&conn->immed_queue_lock); |
| |
| spin_lock_bh(&conn->response_queue_lock); |
| list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, |
| qr_list) { |
| list_del(&qr->qr_list); |
| if (qr->cmd) |
| atomic_dec(&qr->cmd->response_queue_count); |
| |
| kmem_cache_free(lio_qr_cache, qr); |
| } |
| spin_unlock_bh(&conn->response_queue_lock); |
| } |
| |
| void iscsit_release_cmd(struct iscsi_cmd *cmd) |
| { |
| struct iscsi_session *sess; |
| struct se_cmd *se_cmd = &cmd->se_cmd; |
| |
| WARN_ON(!list_empty(&cmd->i_conn_node)); |
| |
| if (cmd->conn) |
| sess = cmd->conn->sess; |
| else |
| sess = cmd->sess; |
| |
| BUG_ON(!sess || !sess->se_sess); |
| |
| kfree(cmd->buf_ptr); |
| kfree(cmd->pdu_list); |
| kfree(cmd->seq_list); |
| kfree(cmd->tmr_req); |
| kfree(cmd->iov_data); |
| kfree(cmd->text_in_ptr); |
| |
| target_free_tag(sess->se_sess, se_cmd); |
| } |
| EXPORT_SYMBOL(iscsit_release_cmd); |
| |
| void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool check_queues) |
| { |
| struct iscsi_conn *conn = cmd->conn; |
| |
| WARN_ON(!list_empty(&cmd->i_conn_node)); |
| |
| if (cmd->data_direction == DMA_TO_DEVICE) { |
| iscsit_stop_dataout_timer(cmd); |
| iscsit_free_r2ts_from_list(cmd); |
| } |
| if (cmd->data_direction == DMA_FROM_DEVICE) |
| iscsit_free_all_datain_reqs(cmd); |
| |
| if (conn && check_queues) { |
| iscsit_remove_cmd_from_immediate_queue(cmd, conn); |
| iscsit_remove_cmd_from_response_queue(cmd, conn); |
| } |
| |
| if (conn && conn->conn_transport->iscsit_unmap_cmd) |
| conn->conn_transport->iscsit_unmap_cmd(conn, cmd); |
| } |
| |
| void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown) |
| { |
| struct se_cmd *se_cmd = cmd->se_cmd.se_tfo ? &cmd->se_cmd : NULL; |
| int rc; |
| |
| __iscsit_free_cmd(cmd, shutdown); |
| if (se_cmd) { |
| rc = transport_generic_free_cmd(se_cmd, shutdown); |
| if (!rc && shutdown && se_cmd->se_sess) { |
| __iscsit_free_cmd(cmd, shutdown); |
| target_put_sess_cmd(se_cmd); |
| } |
| } else { |
| iscsit_release_cmd(cmd); |
| } |
| } |
| EXPORT_SYMBOL(iscsit_free_cmd); |
| |
| int iscsit_check_session_usage_count(struct iscsi_session *sess) |
| { |
| spin_lock_bh(&sess->session_usage_lock); |
| if (sess->session_usage_count != 0) { |
| sess->session_waiting_on_uc = 1; |
| spin_unlock_bh(&sess->session_usage_lock); |
| if (in_interrupt()) |
| return 2; |
| |
| wait_for_completion(&sess->session_waiting_on_uc_comp); |
| return 1; |
| } |
| spin_unlock_bh(&sess->session_usage_lock); |
| |
| return 0; |
| } |
| |
| void iscsit_dec_session_usage_count(struct iscsi_session *sess) |
| { |
| spin_lock_bh(&sess->session_usage_lock); |
| sess->session_usage_count--; |
| |
| if (!sess->session_usage_count && sess->session_waiting_on_uc) |
| complete(&sess->session_waiting_on_uc_comp); |
| |
| spin_unlock_bh(&sess->session_usage_lock); |
| } |
| |
| void iscsit_inc_session_usage_count(struct iscsi_session *sess) |
| { |
| spin_lock_bh(&sess->session_usage_lock); |
| sess->session_usage_count++; |
| spin_unlock_bh(&sess->session_usage_lock); |
| } |
| |
| struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid) |
| { |
| struct iscsi_conn *conn; |
| |
| spin_lock_bh(&sess->conn_lock); |
| list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { |
| if ((conn->cid == cid) && |
| (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) { |
| iscsit_inc_conn_usage_count(conn); |
| spin_unlock_bh(&sess->conn_lock); |
| return conn; |
| } |
| } |
| spin_unlock_bh(&sess->conn_lock); |
| |
| return NULL; |
| } |
| |
| struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid) |
| { |
| struct iscsi_conn *conn; |
| |
| spin_lock_bh(&sess->conn_lock); |
| list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { |
| if (conn->cid == cid) { |
| iscsit_inc_conn_usage_count(conn); |
| spin_lock(&conn->state_lock); |
| atomic_set(&conn->connection_wait_rcfr, 1); |
| spin_unlock(&conn->state_lock); |
| spin_unlock_bh(&sess->conn_lock); |
| return conn; |
| } |
| } |
| spin_unlock_bh(&sess->conn_lock); |
| |
| return NULL; |
| } |
| |
| void iscsit_check_conn_usage_count(struct iscsi_conn *conn) |
| { |
| spin_lock_bh(&conn->conn_usage_lock); |
| if (conn->conn_usage_count != 0) { |
| conn->conn_waiting_on_uc = 1; |
| spin_unlock_bh(&conn->conn_usage_lock); |
| |
| wait_for_completion(&conn->conn_waiting_on_uc_comp); |
| return; |
| } |
| spin_unlock_bh(&conn->conn_usage_lock); |
| } |
| |
| void iscsit_dec_conn_usage_count(struct iscsi_conn *conn) |
| { |
| spin_lock_bh(&conn->conn_usage_lock); |
| conn->conn_usage_count--; |
| |
| if (!conn->conn_usage_count && conn->conn_waiting_on_uc) |
| complete(&conn->conn_waiting_on_uc_comp); |
| |
| spin_unlock_bh(&conn->conn_usage_lock); |
| } |
| |
| void iscsit_inc_conn_usage_count(struct iscsi_conn *conn) |
| { |
| spin_lock_bh(&conn->conn_usage_lock); |
| conn->conn_usage_count++; |
| spin_unlock_bh(&conn->conn_usage_lock); |
| } |
| |
| static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response) |
| { |
| u8 state; |
| struct iscsi_cmd *cmd; |
| |
| cmd = iscsit_allocate_cmd(conn, TASK_RUNNING); |
| if (!cmd) |
| return -1; |
| |
| cmd->iscsi_opcode = ISCSI_OP_NOOP_IN; |
| state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE : |
| ISTATE_SEND_NOPIN_NO_RESPONSE; |
| cmd->init_task_tag = RESERVED_ITT; |
| cmd->targ_xfer_tag = (want_response) ? |
| session_get_next_ttt(conn->sess) : 0xFFFFFFFF; |
| spin_lock_bh(&conn->cmd_lock); |
| list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); |
| spin_unlock_bh(&conn->cmd_lock); |
| |
| if (want_response) |
| iscsit_start_nopin_response_timer(conn); |
| iscsit_add_cmd_to_immediate_queue(cmd, conn, state); |
| |
| return 0; |
| } |
| |
| void iscsit_handle_nopin_response_timeout(struct timer_list *t) |
| { |
| struct iscsi_conn *conn = from_timer(conn, t, nopin_response_timer); |
| struct iscsi_session *sess = conn->sess; |
| |
| iscsit_inc_conn_usage_count(conn); |
| |
| spin_lock_bh(&conn->nopin_timer_lock); |
| if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) { |
| spin_unlock_bh(&conn->nopin_timer_lock); |
| iscsit_dec_conn_usage_count(conn); |
| return; |
| } |
| |
| pr_err("Did not receive response to NOPIN on CID: %hu, failing" |
| " connection for I_T Nexus %s,i,0x%6phN,%s,t,0x%02x\n", |
| conn->cid, sess->sess_ops->InitiatorName, sess->isid, |
| sess->tpg->tpg_tiqn->tiqn, (u32)sess->tpg->tpgt); |
| conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; |
| spin_unlock_bh(&conn->nopin_timer_lock); |
| |
| iscsit_fill_cxn_timeout_err_stats(sess); |
| iscsit_cause_connection_reinstatement(conn, 0); |
| iscsit_dec_conn_usage_count(conn); |
| } |
| |
| void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn) |
| { |
| struct iscsi_session *sess = conn->sess; |
| struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); |
| |
| spin_lock_bh(&conn->nopin_timer_lock); |
| if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { |
| spin_unlock_bh(&conn->nopin_timer_lock); |
| return; |
| } |
| |
| mod_timer(&conn->nopin_response_timer, |
| (get_jiffies_64() + na->nopin_response_timeout * HZ)); |
| spin_unlock_bh(&conn->nopin_timer_lock); |
| } |
| |
| void iscsit_start_nopin_response_timer(struct iscsi_conn *conn) |
| { |
| struct iscsi_session *sess = conn->sess; |
| struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); |
| |
| spin_lock_bh(&conn->nopin_timer_lock); |
| if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) { |
| spin_unlock_bh(&conn->nopin_timer_lock); |
| return; |
| } |
| |
| conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP; |
| conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING; |
| mod_timer(&conn->nopin_response_timer, |
| jiffies + na->nopin_response_timeout * HZ); |
| |
| pr_debug("Started NOPIN Response Timer on CID: %d to %u" |
| " seconds\n", conn->cid, na->nopin_response_timeout); |
| spin_unlock_bh(&conn->nopin_timer_lock); |
| } |
| |
| void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn) |
| { |
| spin_lock_bh(&conn->nopin_timer_lock); |
| if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { |
| spin_unlock_bh(&conn->nopin_timer_lock); |
| return; |
| } |
| conn->nopin_response_timer_flags |= ISCSI_TF_STOP; |
| spin_unlock_bh(&conn->nopin_timer_lock); |
| |
| del_timer_sync(&conn->nopin_response_timer); |
| |
| spin_lock_bh(&conn->nopin_timer_lock); |
| conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; |
| spin_unlock_bh(&conn->nopin_timer_lock); |
| } |
| |
| void iscsit_handle_nopin_timeout(struct timer_list *t) |
| { |
| struct iscsi_conn *conn = from_timer(conn, t, nopin_timer); |
| |
| iscsit_inc_conn_usage_count(conn); |
| |
| spin_lock_bh(&conn->nopin_timer_lock); |
| if (conn->nopin_timer_flags & ISCSI_TF_STOP) { |
| spin_unlock_bh(&conn->nopin_timer_lock); |
| iscsit_dec_conn_usage_count(conn); |
| return; |
| } |
| conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; |
| spin_unlock_bh(&conn->nopin_timer_lock); |
| |
| iscsit_add_nopin(conn, 1); |
| iscsit_dec_conn_usage_count(conn); |
| } |
| |
| void __iscsit_start_nopin_timer(struct iscsi_conn *conn) |
| { |
| struct iscsi_session *sess = conn->sess; |
| struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); |
| |
| lockdep_assert_held(&conn->nopin_timer_lock); |
| |
| /* |
| * NOPIN timeout is disabled. |
| */ |
| if (!na->nopin_timeout) |
| return; |
| |
| if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) |
| return; |
| |
| conn->nopin_timer_flags &= ~ISCSI_TF_STOP; |
| conn->nopin_timer_flags |= ISCSI_TF_RUNNING; |
| mod_timer(&conn->nopin_timer, jiffies + na->nopin_timeout * HZ); |
| |
| pr_debug("Started NOPIN Timer on CID: %d at %u second" |
| " interval\n", conn->cid, na->nopin_timeout); |
| } |
| |
| void iscsit_start_nopin_timer(struct iscsi_conn *conn) |
| { |
| spin_lock_bh(&conn->nopin_timer_lock); |
| __iscsit_start_nopin_timer(conn); |
| spin_unlock_bh(&conn->nopin_timer_lock); |
| } |
| |
| void iscsit_stop_nopin_timer(struct iscsi_conn *conn) |
| { |
| spin_lock_bh(&conn->nopin_timer_lock); |
| if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) { |
| spin_unlock_bh(&conn->nopin_timer_lock); |
| return; |
| } |
| conn->nopin_timer_flags |= ISCSI_TF_STOP; |
| spin_unlock_bh(&conn->nopin_timer_lock); |
| |
| del_timer_sync(&conn->nopin_timer); |
| |
| spin_lock_bh(&conn->nopin_timer_lock); |
| conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; |
| spin_unlock_bh(&conn->nopin_timer_lock); |
| } |
| |
| int iscsit_send_tx_data( |
| struct iscsi_cmd *cmd, |
| struct iscsi_conn *conn, |
| int use_misc) |
| { |
| int tx_sent, tx_size; |
| u32 iov_count; |
| struct kvec *iov; |
| |
| send_data: |
| tx_size = cmd->tx_size; |
| |
| if (!use_misc) { |
| iov = &cmd->iov_data[0]; |
| iov_count = cmd->iov_data_count; |
| } else { |
| iov = &cmd->iov_misc[0]; |
| iov_count = cmd->iov_misc_count; |
| } |
| |
| tx_sent = tx_data(conn, &iov[0], iov_count, tx_size); |
| if (tx_size != tx_sent) { |
| if (tx_sent == -EAGAIN) { |
| pr_err("tx_data() returned -EAGAIN\n"); |
| goto send_data; |
| } else |
| return -1; |
| } |
| cmd->tx_size = 0; |
| |
| return 0; |
| } |
| |
| int iscsit_fe_sendpage_sg( |
| struct iscsi_cmd *cmd, |
| struct iscsi_conn *conn) |
| { |
| struct scatterlist *sg = cmd->first_data_sg; |
| struct kvec iov; |
| u32 tx_hdr_size, data_len; |
| u32 offset = cmd->first_data_sg_off; |
| int tx_sent, iov_off; |
| |
| send_hdr: |
| tx_hdr_size = ISCSI_HDR_LEN; |
| if (conn->conn_ops->HeaderDigest) |
| tx_hdr_size += ISCSI_CRC_LEN; |
| |
| iov.iov_base = cmd->pdu; |
| iov.iov_len = tx_hdr_size; |
| |
| tx_sent = tx_data(conn, &iov, 1, tx_hdr_size); |
| if (tx_hdr_size != tx_sent) { |
| if (tx_sent == -EAGAIN) { |
| pr_err("tx_data() returned -EAGAIN\n"); |
| goto send_hdr; |
| } |
| return -1; |
| } |
| |
| data_len = cmd->tx_size - tx_hdr_size - cmd->padding; |
| /* |
| * Set iov_off used by padding and data digest tx_data() calls below |
| * in order to determine proper offset into cmd->iov_data[] |
| */ |
| if (conn->conn_ops->DataDigest) { |
| data_len -= ISCSI_CRC_LEN; |
| if (cmd->padding) |
| iov_off = (cmd->iov_data_count - 2); |
| else |
| iov_off = (cmd->iov_data_count - 1); |
| } else { |
| iov_off = (cmd->iov_data_count - 1); |
| } |
| /* |
| * Perform sendpage() for each page in the scatterlist |
| */ |
| while (data_len) { |
| u32 space = (sg->length - offset); |
| u32 sub_len = min_t(u32, data_len, space); |
| send_pg: |
| tx_sent = conn->sock->ops->sendpage(conn->sock, |
| sg_page(sg), sg->offset + offset, sub_len, 0); |
| if (tx_sent != sub_len) { |
| if (tx_sent == -EAGAIN) { |
| pr_err("tcp_sendpage() returned" |
| " -EAGAIN\n"); |
| goto send_pg; |
| } |
| |
| pr_err("tcp_sendpage() failure: %d\n", |
| tx_sent); |
| return -1; |
| } |
| |
| data_len -= sub_len; |
| offset = 0; |
| sg = sg_next(sg); |
| } |
| |
| send_padding: |
| if (cmd->padding) { |
| struct kvec *iov_p = &cmd->iov_data[iov_off++]; |
| |
| tx_sent = tx_data(conn, iov_p, 1, cmd->padding); |
| if (cmd->padding != tx_sent) { |
| if (tx_sent == -EAGAIN) { |
| pr_err("tx_data() returned -EAGAIN\n"); |
| goto send_padding; |
| } |
| return -1; |
| } |
| } |
| |
| send_datacrc: |
| if (conn->conn_ops->DataDigest) { |
| struct kvec *iov_d = &cmd->iov_data[iov_off]; |
| |
| tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN); |
| if (ISCSI_CRC_LEN != tx_sent) { |
| if (tx_sent == -EAGAIN) { |
| pr_err("tx_data() returned -EAGAIN\n"); |
| goto send_datacrc; |
| } |
| return -1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU |
| * back to the Initiator when an expection condition occurs with the |
| * errors set in status_class and status_detail. |
| * |
| * Parameters: iSCSI Connection, Status Class, Status Detail. |
| * Returns: 0 on success, -1 on error. |
| */ |
| int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail) |
| { |
| struct iscsi_login_rsp *hdr; |
| struct iscsi_login *login = conn->conn_login; |
| |
| login->login_failed = 1; |
| iscsit_collect_login_stats(conn, status_class, status_detail); |
| |
| memset(&login->rsp[0], 0, ISCSI_HDR_LEN); |
| |
| hdr = (struct iscsi_login_rsp *)&login->rsp[0]; |
| hdr->opcode = ISCSI_OP_LOGIN_RSP; |
| hdr->status_class = status_class; |
| hdr->status_detail = status_detail; |
| hdr->itt = conn->login_itt; |
| |
| return conn->conn_transport->iscsit_put_login_tx(conn, login, 0); |
| } |
| |
| void iscsit_print_session_params(struct iscsi_session *sess) |
| { |
| struct iscsi_conn *conn; |
| |
| pr_debug("-----------------------------[Session Params for" |
| " SID: %u]-----------------------------\n", sess->sid); |
| spin_lock_bh(&sess->conn_lock); |
| list_for_each_entry(conn, &sess->sess_conn_list, conn_list) |
| iscsi_dump_conn_ops(conn->conn_ops); |
| spin_unlock_bh(&sess->conn_lock); |
| |
| iscsi_dump_sess_ops(sess->sess_ops); |
| } |
| |
| static int iscsit_do_rx_data( |
| struct iscsi_conn *conn, |
| struct iscsi_data_count *count) |
| { |
| int data = count->data_length, rx_loop = 0, total_rx = 0; |
| struct msghdr msg; |
| |
| if (!conn || !conn->sock || !conn->conn_ops) |
| return -1; |
| |
| memset(&msg, 0, sizeof(struct msghdr)); |
| iov_iter_kvec(&msg.msg_iter, READ, count->iov, count->iov_count, data); |
| |
| while (msg_data_left(&msg)) { |
| rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL); |
| if (rx_loop <= 0) { |
| pr_debug("rx_loop: %d total_rx: %d\n", |
| rx_loop, total_rx); |
| return rx_loop; |
| } |
| total_rx += rx_loop; |
| pr_debug("rx_loop: %d, total_rx: %d, data: %d\n", |
| rx_loop, total_rx, data); |
| } |
| |
| return total_rx; |
| } |
| |
| int rx_data( |
| struct iscsi_conn *conn, |
| struct kvec *iov, |
| int iov_count, |
| int data) |
| { |
| struct iscsi_data_count c; |
| |
| if (!conn || !conn->sock || !conn->conn_ops) |
| return -1; |
| |
| memset(&c, 0, sizeof(struct iscsi_data_count)); |
| c.iov = iov; |
| c.iov_count = iov_count; |
| c.data_length = data; |
| c.type = ISCSI_RX_DATA; |
| |
| return iscsit_do_rx_data(conn, &c); |
| } |
| |
| int tx_data( |
| struct iscsi_conn *conn, |
| struct kvec *iov, |
| int iov_count, |
| int data) |
| { |
| struct msghdr msg; |
| int total_tx = 0; |
| |
| if (!conn || !conn->sock || !conn->conn_ops) |
| return -1; |
| |
| if (data <= 0) { |
| pr_err("Data length is: %d\n", data); |
| return -1; |
| } |
| |
| memset(&msg, 0, sizeof(struct msghdr)); |
| |
| iov_iter_kvec(&msg.msg_iter, WRITE, iov, iov_count, data); |
| |
| while (msg_data_left(&msg)) { |
| int tx_loop = sock_sendmsg(conn->sock, &msg); |
| if (tx_loop <= 0) { |
| pr_debug("tx_loop: %d total_tx %d\n", |
| tx_loop, total_tx); |
| return tx_loop; |
| } |
| total_tx += tx_loop; |
| pr_debug("tx_loop: %d, total_tx: %d, data: %d\n", |
| tx_loop, total_tx, data); |
| } |
| |
| return total_tx; |
| } |
| |
| void iscsit_collect_login_stats( |
| struct iscsi_conn *conn, |
| u8 status_class, |
| u8 status_detail) |
| { |
| struct iscsi_param *intrname = NULL; |
| struct iscsi_tiqn *tiqn; |
| struct iscsi_login_stats *ls; |
| |
| tiqn = iscsit_snmp_get_tiqn(conn); |
| if (!tiqn) |
| return; |
| |
| ls = &tiqn->login_stats; |
| |
| spin_lock(&ls->lock); |
| if (status_class == ISCSI_STATUS_CLS_SUCCESS) |
| ls->accepts++; |
| else if (status_class == ISCSI_STATUS_CLS_REDIRECT) { |
| ls->redirects++; |
| ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT; |
| } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && |
| (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) { |
| ls->authenticate_fails++; |
| ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE; |
| } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && |
| (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) { |
| ls->authorize_fails++; |
| ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE; |
| } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && |
| (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) { |
| ls->negotiate_fails++; |
| ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE; |
| } else { |
| ls->other_fails++; |
| ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER; |
| } |
| |
| /* Save initiator name, ip address and time, if it is a failed login */ |
| if (status_class != ISCSI_STATUS_CLS_SUCCESS) { |
| if (conn->param_list) |
| intrname = iscsi_find_param_from_key(INITIATORNAME, |
| conn->param_list); |
| strlcpy(ls->last_intr_fail_name, |
| (intrname ? intrname->value : "Unknown"), |
| sizeof(ls->last_intr_fail_name)); |
| |
| ls->last_intr_fail_ip_family = conn->login_family; |
| |
| ls->last_intr_fail_sockaddr = conn->login_sockaddr; |
| ls->last_fail_time = get_jiffies_64(); |
| } |
| |
| spin_unlock(&ls->lock); |
| } |
| |
| struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn) |
| { |
| struct iscsi_portal_group *tpg; |
| |
| if (!conn) |
| return NULL; |
| |
| tpg = conn->tpg; |
| if (!tpg) |
| return NULL; |
| |
| if (!tpg->tpg_tiqn) |
| return NULL; |
| |
| return tpg->tpg_tiqn; |
| } |
| |
| void iscsit_fill_cxn_timeout_err_stats(struct iscsi_session *sess) |
| { |
| struct iscsi_portal_group *tpg = sess->tpg; |
| struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; |
| |
| if (!tiqn) |
| return; |
| |
| spin_lock_bh(&tiqn->sess_err_stats.lock); |
| strlcpy(tiqn->sess_err_stats.last_sess_fail_rem_name, |
| sess->sess_ops->InitiatorName, |
| sizeof(tiqn->sess_err_stats.last_sess_fail_rem_name)); |
| tiqn->sess_err_stats.last_sess_failure_type = |
| ISCSI_SESS_ERR_CXN_TIMEOUT; |
| tiqn->sess_err_stats.cxn_timeout_errors++; |
| atomic_long_inc(&sess->conn_timeout_errors); |
| spin_unlock_bh(&tiqn->sess_err_stats.lock); |
| } |