forked from luck/tmp_suning_uos_patched
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>
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35462975b2
commit
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@ -1842,11 +1842,35 @@ int transport_generic_handle_cdb(
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printk(KERN_ERR "cmd->se_lun is NULL\n");
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return -EINVAL;
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}
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transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD);
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return 0;
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}
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EXPORT_SYMBOL(transport_generic_handle_cdb);
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/*
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* Used by fabric module frontends to queue tasks directly.
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* Many only be used from process context only
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*/
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int transport_handle_cdb_direct(
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struct se_cmd *cmd)
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{
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if (!cmd->se_lun) {
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dump_stack();
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printk(KERN_ERR "cmd->se_lun is NULL\n");
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return -EINVAL;
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}
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if (in_interrupt()) {
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dump_stack();
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printk(KERN_ERR "transport_generic_handle_cdb cannot be called"
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" from interrupt context\n");
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return -EINVAL;
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}
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return transport_generic_new_cmd(cmd);
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}
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EXPORT_SYMBOL(transport_handle_cdb_direct);
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/*
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* Used by fabric module frontends defining a TFO->new_cmd_map() caller
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* to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
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@ -166,6 +166,7 @@ extern void transport_init_se_cmd(struct se_cmd *,
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extern void transport_free_se_cmd(struct se_cmd *);
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extern int transport_generic_allocate_tasks(struct se_cmd *, unsigned char *);
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extern int transport_generic_handle_cdb(struct se_cmd *);
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extern int transport_handle_cdb_direct(struct se_cmd *);
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extern int transport_generic_handle_cdb_map(struct se_cmd *);
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extern int transport_generic_handle_data(struct se_cmd *);
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extern void transport_new_cmd_failure(struct se_cmd *);
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