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/usb/gadget/tcm_usb_gadget.c b/drivers/usb/gadget/tcm_usb_gadget.c
index b7ac43b08851..575c82437e4a 100644
--- a/drivers/usb/gadget/tcm_usb_gadget.c
+++ b/drivers/usb/gadget/tcm_usb_gadget.c
@@ -1475,11 +1475,6 @@ static int usbg_queue_tm_rsp(struct se_cmd *se_cmd)
         return 0;
 }
 
-static u16 usbg_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length)
-{
-        return 0;
-}
-
 static const char *usbg_check_wwn(const char *name)
 {
         const char *n;
@@ -1905,7 +1900,6 @@ static struct target_core_fabric_ops usbg_ops = {
         .queue_data_in                  = usbg_send_read_response,
         .queue_status                   = usbg_send_status_response,
         .queue_tm_rsp                   = usbg_queue_tm_rsp,
-        .set_fabric_sense_len           = usbg_set_fabric_sense_len,
         .check_stop_free                = usbg_check_stop_free,
 
         .fabric_make_wwn                = usbg_make_tport,