/******************************************************************************* * This file contains the iSCSI Target specific utility functions. * * (c) Copyright 2007-2013 Datera, Inc. * * Author: Nicholas A. Bellinger * * 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 #include #include #include #include #include #include #include #include #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; /* * Called with cmd->r2t_lock held. */ int iscsit_add_r2t_to_list( struct iscsi_cmd *cmd, u32 offset, u32 xfer_len, int recovery, u32 r2t_sn) { struct iscsi_r2t *r2t; 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; } /* * Called with cmd->r2t_lock held. */ void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd) { 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); } /* * 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; tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state); 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->conn = conn; 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); 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) { 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. */ if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) { pr_err("Received CmdSN: 0x%08x is greater than" " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, sess->max_cmd_sn); 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; } 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); } 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)); } } void 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; } 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); } 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; 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); percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag); } EXPORT_SYMBOL(iscsit_release_cmd); void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd, bool check_queues) { struct iscsi_conn *conn = cmd->conn; if (scsi_cmd) { 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); } } void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown) { struct se_cmd *se_cmd = NULL; int rc; /* * Determine if a struct se_cmd is associated with * this struct iscsi_cmd. */ switch (cmd->iscsi_opcode) { case ISCSI_OP_SCSI_CMD: se_cmd = &cmd->se_cmd; __iscsit_free_cmd(cmd, true, shutdown); /* * Fallthrough */ case ISCSI_OP_SCSI_TMFUNC: rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown); if (!rc && shutdown && se_cmd && se_cmd->se_sess) { __iscsit_free_cmd(cmd, true, shutdown); target_put_sess_cmd(se_cmd->se_sess, se_cmd); } break; case ISCSI_OP_REJECT: /* * Handle special case for REJECT when iscsi_add_reject*() has * overwritten the original iscsi_opcode assignment, and the * associated cmd->se_cmd needs to be released. */ if (cmd->se_cmd.se_tfo != NULL) { se_cmd = &cmd->se_cmd; __iscsit_free_cmd(cmd, true, shutdown); rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown); if (!rc && shutdown && se_cmd->se_sess) { __iscsit_free_cmd(cmd, true, shutdown); target_put_sess_cmd(se_cmd->se_sess, se_cmd); } break; } /* Fall-through */ default: __iscsit_free_cmd(cmd, false, shutdown); iscsit_release_cmd(cmd); break; } } 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; } static void iscsit_handle_nopin_response_timeout(unsigned long data) { struct iscsi_conn *conn = (struct iscsi_conn *) data; 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_debug("Did not receive response to NOPIN on CID: %hu on" " SID: %u, failing connection.\n", conn->cid, conn->sess->sid); conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; spin_unlock_bh(&conn->nopin_timer_lock); { struct iscsi_portal_group *tpg = conn->sess->tpg; struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; if (tiqn) { spin_lock_bh(&tiqn->sess_err_stats.lock); strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name, conn->sess->sess_ops->InitiatorName); tiqn->sess_err_stats.last_sess_failure_type = ISCSI_SESS_ERR_CXN_TIMEOUT; tiqn->sess_err_stats.cxn_timeout_errors++; atomic_long_inc(&conn->sess->conn_timeout_errors); spin_unlock_bh(&tiqn->sess_err_stats.lock); } } 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); } /* * Called with conn->nopin_timer_lock held. */ 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; } init_timer(&conn->nopin_response_timer); conn->nopin_response_timer.expires = (get_jiffies_64() + na->nopin_response_timeout * HZ); conn->nopin_response_timer.data = (unsigned long)conn; conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout; conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP; conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING; add_timer(&conn->nopin_response_timer); 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); } static void iscsit_handle_nopin_timeout(unsigned long data) { struct iscsi_conn *conn = (struct iscsi_conn *) data; 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); } /* * Called with conn->nopin_timer_lock held. */ 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); /* * NOPIN timeout is disabled. */ if (!na->nopin_timeout) return; if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) return; init_timer(&conn->nopin_timer); conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); conn->nopin_timer.data = (unsigned long)conn; conn->nopin_timer.function = iscsit_handle_nopin_timeout; conn->nopin_timer_flags &= ~ISCSI_TF_STOP; conn->nopin_timer_flags |= ISCSI_TF_RUNNING; add_timer(&conn->nopin_timer); 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) { struct iscsi_session *sess = conn->sess; struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); /* * NOPIN timeout is disabled.. */ if (!na->nopin_timeout) return; spin_lock_bh(&conn->nopin_timer_lock); if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) { spin_unlock_bh(&conn->nopin_timer_lock); return; } init_timer(&conn->nopin_timer); conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); conn->nopin_timer.data = (unsigned long)conn; conn->nopin_timer.function = iscsit_handle_nopin_timeout; conn->nopin_timer_flags &= ~ISCSI_TF_STOP; conn->nopin_timer_flags |= ISCSI_TF_RUNNING; add_timer(&conn->nopin_timer); pr_debug("Started NOPIN Timer on CID: %d at %u second" " interval\n", conn->cid, na->nopin_timeout); 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 | ITER_KVEC, count->iov, count->iov_count, data); while (total_rx < data) { rx_loop = sock_recvmsg(conn->sock, &msg, (data - total_rx), 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; } static int iscsit_do_tx_data( struct iscsi_conn *conn, struct iscsi_data_count *count) { int ret, iov_len; struct kvec *iov_p; struct msghdr msg; if (!conn || !conn->sock || !conn->conn_ops) return -1; if (count->data_length <= 0) { pr_err("Data length is: %d\n", count->data_length); return -1; } memset(&msg, 0, sizeof(struct msghdr)); iov_p = count->iov; iov_len = count->iov_count; ret = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len, count->data_length); if (ret != count->data_length) { pr_err("Unexpected ret: %d send data %d\n", ret, count->data_length); return -EPIPE; } pr_debug("ret: %d, sent data: %d\n", ret, count->data_length); return ret; } 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 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_TX_DATA; return iscsit_do_tx_data(conn, &c); } 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 (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) && ((get_jiffies_64() - ls->last_fail_time) < 10)) { /* We already have the failure info for this login */ spin_unlock(&ls->lock); return; } 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; snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE, "%s", conn->login_ip); 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 || !conn->sess) return NULL; tpg = conn->sess->tpg; if (!tpg) return NULL; if (!tpg->tpg_tiqn) return NULL; return tpg->tpg_tiqn; }