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, 6 deletions

diff --git a/drivers/target/tcm_fc/tfc_conf.c b/drivers/target/tcm_fc/tfc_conf.c
index 4f97701350a8..b74feb0d5133 100644
--- a/drivers/target/tcm_fc/tfc_conf.c
+++ b/drivers/target/tcm_fc/tfc_conf.c
@@ -495,11 +495,6 @@ static void ft_set_default_node_attr(struct se_node_acl *se_nacl)
 {
 }
 
-static u16 ft_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_len)
-{
-	return 0;
-}
-
 static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg)
 {
 	struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr;
@@ -537,7 +532,6 @@ static struct target_core_fabric_ops ft_fabric_ops = {
 	.queue_data_in =		ft_queue_data_in,
 	.queue_status =			ft_queue_status,
 	.queue_tm_rsp =			ft_queue_tm_resp,
-	.set_fabric_sense_len =		ft_set_fabric_sense_len,
 	/*
 	 * Setup function pointers for generic logic in
 	 * target_core_fabric_configfs.c