diff options
| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2011-06-03 20:59:19 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2011-07-22 09:37:44 +0000 |
| commit | 695434e1cbd57f404110bf4ab187a5127ffd79bb (patch) | |
| tree | 7d014011669e28498cf3fd210427373992031735 | |
| parent | 35462975b2b197b990fedbb74b81f9bea9d344cb (diff) | |
target: Add transport_handle_cdb_direct optimization
This patch adds a transport_handle_cdb_direct() optimization for mapping
and queueing tasks directly from within fabric processing context by calling
the newly exported transport_generic_new_cmd(). This currently expects to
be called from process context only, and will fail if called within interrupt
context.
This patch also leaves transport_generic_handle_cdb() unmodified for the
moment to function as expected with existing tcm_fc and ib_srpt fabrics,
and will be removed once these have been converted and tested with v4.1
code using transport_handle_cdb_direct().
Based on Andy's original patch here:
[PATCH 39/42] target: Call transport_new_cmd instead of adding to cmd queue
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
| -rw-r--r-- | drivers/target/target_core_transport.c | 24 | ||||
| -rw-r--r-- | include/target/target_core_transport.h | 1 |
2 files changed, 25 insertions, 0 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index d42a98e4725..1ae6eb7a621 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -1842,12 +1842,36 @@ int transport_generic_handle_cdb( printk(KERN_ERR "cmd->se_lun is NULL\n"); return -EINVAL; } + transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD); return 0; } EXPORT_SYMBOL(transport_generic_handle_cdb); /* + * Used by fabric module frontends to queue tasks directly. + * Many only be used from process context only + */ +int transport_handle_cdb_direct( + struct se_cmd *cmd) +{ + if (!cmd->se_lun) { + dump_stack(); + printk(KERN_ERR "cmd->se_lun is NULL\n"); + return -EINVAL; + } + if (in_interrupt()) { + dump_stack(); + printk(KERN_ERR "transport_generic_handle_cdb cannot be called" + " from interrupt context\n"); + return -EINVAL; + } + + return transport_generic_new_cmd(cmd); +} +EXPORT_SYMBOL(transport_handle_cdb_direct); + +/* * Used by fabric module frontends defining a TFO->new_cmd_map() caller * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to * complete setup in TCM process context w/ TFO->new_cmd_map(). diff --git a/include/target/target_core_transport.h b/include/target/target_core_transport.h index 604e669527b..2aae7641237 100644 --- a/include/target/target_core_transport.h +++ b/include/target/target_core_transport.h @@ -166,6 +166,7 @@ extern void transport_init_se_cmd(struct se_cmd *, extern void transport_free_se_cmd(struct se_cmd *); extern int transport_generic_allocate_tasks(struct se_cmd *, unsigned char *); extern int transport_generic_handle_cdb(struct se_cmd *); +extern int transport_handle_cdb_direct(struct se_cmd *); extern int transport_generic_handle_cdb_map(struct se_cmd *); extern int transport_generic_handle_data(struct se_cmd *); extern void transport_new_cmd_failure(struct se_cmd *); |