target: Simplify fabric sense data length handling

Every fabric driver has to supply a se_tfo->set_fabric_sense_len()
method, just so iSCSI can return an offset of 2.  However, every fabric
driver is already allocating a sense buffer and passing it into the
target core, either via transport_init_se_cmd() or target_submit_cmd().

So instead of having iSCSI pass the start of its sense buffer into the
core and then later tell the core to skip the first 2 bytes, it seems
easier for iSCSI just to do the offset of 2 when it passes the sense
buffer into the core.  Then we can drop the se_tfo->set_fabric_sense_len()
everywhere, and just add a couple of lines of code to iSCSI to set the
sense data length to the beginning of the buffer right before it sends
it over the network.

(nab: Remove .set_fabric_sense_len usage from tcm_qla2xxx_npiv_ops +
      change transport_get_sense_buffer to follow v3.6-rc6 code w/o
      ->set_fabric_sense_len usage)

Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 0 insertions, 8 deletions

diff --git a/Documentation/target/tcm_mod_builder.py b/Documentation/target/tcm_mod_builder.py
index 13652381cb71..3fe0d812dcec 100755
--- a/Documentation/target/tcm_mod_builder.py
+++ b/Documentation/target/tcm_mod_builder.py
@@ -402,7 +402,6 @@ def tcm_mod_build_configfs(proto_ident, fabric_mod_dir_var, fabric_mod_name):
         buf += "        .queue_data_in                  = " + fabric_mod_name + "_queue_data_in,\n"
         buf += "        .queue_status                   = " + fabric_mod_name + "_queue_status,\n"
         buf += "        .queue_tm_rsp                   = " + fabric_mod_name + "_queue_tm_rsp,\n"
-        buf += "        .set_fabric_sense_len           = " + fabric_mod_name + "_set_fabric_sense_len,\n"
         buf += "        .is_state_remove                = " + fabric_mod_name + "_is_state_remove,\n"
         buf += "        /*\n"
         buf += "         * Setup function pointers for generic logic in target_core_fabric_configfs.c\n"
@@ -905,13 +904,6 @@ def tcm_mod_dump_fabric_ops(proto_ident, fabric_mod_dir_var, fabric_mod_name):
                         buf += "}\n\n"
                         bufi += "int " + fabric_mod_name + "_queue_tm_rsp(struct se_cmd *);\n"
 
-                if re.search('set_fabric_sense_len\)\(', fo):
-                        buf += "u16 " + fabric_mod_name + "_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length)\n"
-                        buf += "{\n"
-                        buf += "        return 0;\n"
-                        buf += "}\n\n"
-                        bufi += "u16 " + fabric_mod_name + "_set_fabric_sense_len(struct se_cmd *, u32);\n"
-
                 if re.search('is_state_remove\)\(', fo):
                         buf += "int " + fabric_mod_name + "_is_state_remove(struct se_cmd *se_cmd)\n"
                         buf += "{\n"