Commit cdb72665 authored by Nicholas Bellinger's avatar Nicholas Bellinger
Browse files

iscsi-target: Add per transport iscsi_cmd alloc/free



This patch converts struct iscsi_cmd memory allocation + free to use
->iscsit_alloc_cmd() iscsit_transport API caller, and export
iscsit_allocate_cmd() symbols

Also add iscsi_cmd->release_cmd() to be used seperately from
iscsit_transport for connection/session shutdown.

v2 changes:

- Remove unnecessary checks in iscsit_alloc_cmd (asias)
- Drop iscsit_transport->iscsit_free_cmd() usage
- Drop iscsit_transport->iscsit_unmap_cmd() usage
- Add iscsi_cmd->release_cmd()
- Convert lio_release_cmd() to use iscsi_cmd->release_cmd()
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent 03aa2070
......@@ -489,6 +489,7 @@ static struct iscsit_transport iscsi_target_transport = {
.iscsit_setup_np = iscsit_setup_np,
.iscsit_accept_np = iscsit_accept_np,
.iscsit_free_np = iscsit_free_np,
.iscsit_alloc_cmd = iscsit_alloc_cmd,
.iscsit_get_login_rx = iscsit_get_login_rx,
.iscsit_put_login_tx = iscsit_put_login_tx,
};
......
......@@ -1700,7 +1700,8 @@ static void lio_release_cmd(struct se_cmd *se_cmd)
{
struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
iscsit_release_cmd(cmd);
pr_debug("Entering lio_release_cmd for se_cmd: %p\n", se_cmd);
cmd->release_cmd(cmd);
}
/* End functions for target_core_fabric_ops */
......
......@@ -485,6 +485,7 @@ struct iscsi_cmd {
u32 first_data_sg_off;
u32 kmapped_nents;
sense_reason_t sense_reason;
void (*release_cmd)(struct iscsi_cmd *);
} ____cacheline_aligned;
struct iscsi_tmr_req {
......
......@@ -149,6 +149,18 @@ 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.
......@@ -157,13 +169,12 @@ struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
{
struct iscsi_cmd *cmd;
cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask);
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;
}
cmd->conn = conn;
cmd->conn = conn;
INIT_LIST_HEAD(&cmd->i_conn_node);
INIT_LIST_HEAD(&cmd->datain_list);
INIT_LIST_HEAD(&cmd->cmd_r2t_list);
......@@ -176,6 +187,7 @@ struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
return cmd;
}
EXPORT_SYMBOL(iscsit_allocate_cmd);
struct iscsi_seq *iscsit_get_seq_holder_for_datain(
struct iscsi_cmd *cmd,
......@@ -690,6 +702,11 @@ void iscsit_free_cmd(struct iscsi_cmd *cmd)
*/
switch (cmd->iscsi_opcode) {
case ISCSI_OP_SCSI_CMD:
if (cmd->data_direction == DMA_TO_DEVICE)
iscsit_stop_dataout_timer(cmd);
/*
* Fallthrough
*/
case ISCSI_OP_SCSI_TMFUNC:
transport_generic_free_cmd(&cmd->se_cmd, 1);
break;
......@@ -705,7 +722,7 @@ void iscsit_free_cmd(struct iscsi_cmd *cmd)
}
/* Fall-through */
default:
iscsit_release_cmd(cmd);
cmd->release_cmd(cmd);
break;
}
}
......
......@@ -8,6 +8,7 @@ extern struct iscsi_r2t *iscsit_get_r2t_for_eos(struct iscsi_cmd *, u32, u32);
extern struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *);
extern void iscsit_free_r2t(struct iscsi_r2t *, struct iscsi_cmd *);
extern void iscsit_free_r2ts_from_list(struct iscsi_cmd *);
extern struct iscsi_cmd *iscsit_alloc_cmd(struct iscsi_conn *, gfp_t);
extern struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *, gfp_t);
extern struct iscsi_seq *iscsit_get_seq_holder_for_datain(struct iscsi_cmd *, u32);
extern struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *);
......
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