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target: Simplify fabric sense data length handling

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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>
This commit is contained in:
Roland Dreier
2012-08-15 14:35:25 -07:00
committed by Nicholas Bellinger
parent 2ed772b7b9
commit 9c58b7ddd7
13 changed files with 79 additions and 163 deletions
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drivers/target/target_core_configfs.c
-4
View File
@@ -457,10 +457,6 @@ static int target_fabric_tf_ops_check(
pr_err("Missing tfo->queue_tm_rsp()\n");
return -EINVAL;
}
if (!tfo->set_fabric_sense_len) {
pr_err("Missing tfo->set_fabric_sense_len()\n");
return -EINVAL;
}
/*
* We at least require tfo->fabric_make_wwn(), tfo->fabric_drop_wwn()
* tfo->fabric_make_tpg() and tfo->fabric_drop_tpg() in