diff options
Diffstat (limited to 'drivers/target/iscsi/iscsi_target_util.c')
| -rw-r--r-- | drivers/target/iscsi/iscsi_target_util.c | 69 |
1 files changed, 36 insertions, 33 deletions
diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c index 1df06d5e4e01..0819e688a398 100644 --- a/drivers/target/iscsi/iscsi_target_util.c +++ b/drivers/target/iscsi/iscsi_target_util.c @@ -1,9 +1,7 @@ /******************************************************************************* * This file contains the iSCSI Target specific utility functions. * - * \u00a9 Copyright 2007-2011 RisingTide Systems LLC. - * - * Licensed to the Linux Foundation under the General Public License (GPL) version 2. + * (c) Copyright 2007-2013 Datera, Inc. * * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> * @@ -19,6 +17,7 @@ ******************************************************************************/ #include <linux/list.h> +#include <linux/percpu_ida.h> #include <scsi/scsi_tcq.h> #include <scsi/iscsi_proto.h> #include <target/target_core_base.h> @@ -149,18 +148,6 @@ void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd) spin_unlock_bh(&cmd->r2t_lock); } -struct iscsi_cmd *iscsit_alloc_cmd(struct iscsi_conn *conn, gfp_t gfp_mask) -{ - struct iscsi_cmd *cmd; - - cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask); - if (!cmd) - return NULL; - - cmd->release_cmd = &iscsit_release_cmd; - return cmd; -} - /* * May be called from software interrupt (timer) context for allocating * iSCSI NopINs. @@ -168,12 +155,15 @@ struct iscsi_cmd *iscsit_alloc_cmd(struct iscsi_conn *conn, gfp_t gfp_mask) struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask) { struct iscsi_cmd *cmd; + struct se_session *se_sess = conn->sess->se_sess; + int size, tag; - cmd = conn->conn_transport->iscsit_alloc_cmd(conn, gfp_mask); - if (!cmd) { - pr_err("Unable to allocate memory for struct iscsi_cmd.\n"); - return NULL; - } + tag = percpu_ida_alloc(&se_sess->sess_tag_pool, gfp_mask); + 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); @@ -252,9 +242,9 @@ static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cm */ if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) { pr_err("Received CmdSN: 0x%08x is greater than" - " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn, + " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, sess->max_cmd_sn); - ret = CMDSN_ERROR_CANNOT_RECOVER; + ret = CMDSN_MAXCMDSN_OVERRUN; } else if (cmdsn == sess->exp_cmd_sn) { sess->exp_cmd_sn++; @@ -313,14 +303,16 @@ int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 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); - ret = cmdsn_ret; - break; - default: - reason = ISCSI_REASON_PROTOCOL_ERROR; - reject = true; - ret = cmdsn_ret; + /* + * 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); @@ -689,6 +681,16 @@ void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn) 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); @@ -696,8 +698,9 @@ void iscsit_release_cmd(struct iscsi_cmd *cmd) kfree(cmd->iov_data); kfree(cmd->text_in_ptr); - kmem_cache_free(lio_cmd_cache, cmd); + percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag); } +EXPORT_SYMBOL(iscsit_release_cmd); static void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd, bool check_queues) @@ -735,7 +738,7 @@ void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown) * Fallthrough */ case ISCSI_OP_SCSI_TMFUNC: - rc = transport_generic_free_cmd(&cmd->se_cmd, 1); + 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); @@ -751,7 +754,7 @@ void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown) se_cmd = &cmd->se_cmd; __iscsit_free_cmd(cmd, true, shutdown); - rc = transport_generic_free_cmd(&cmd->se_cmd, 1); + 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); @@ -761,7 +764,7 @@ void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown) /* Fall-through */ default: __iscsit_free_cmd(cmd, false, shutdown); - cmd->release_cmd(cmd); + iscsit_release_cmd(cmd); break; } } @@ -979,7 +982,7 @@ static void iscsit_handle_nopin_response_timeout(unsigned long data) tiqn->sess_err_stats.last_sess_failure_type = ISCSI_SESS_ERR_CXN_TIMEOUT; tiqn->sess_err_stats.cxn_timeout_errors++; - conn->sess->conn_timeout_errors++; + atomic_long_inc(&conn->sess->conn_timeout_errors); spin_unlock_bh(&tiqn->sess_err_stats.lock); } } |