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authorNicholas Bellinger <nab@linux-iscsi.org>2011-06-04 07:59:19 +0400
committerNicholas Bellinger <nab@linux-iscsi.org>2011-07-22 13:37:44 +0400
commit695434e1cbd57f404110bf4ab187a5127ffd79bb (patch)
tree7d014011669e28498cf3fd210427373992031735 /drivers/target
parent35462975b2b197b990fedbb74b81f9bea9d344cb (diff)
downloadlinux-695434e1cbd57f404110bf4ab187a5127ffd79bb.tar.xz
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>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_transport.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index d42a98e4725b..1ae6eb7a621b 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().