linux/include
Nicholas Bellinger 07bde79a5c target: Add SCF_EMULATE_QUEUE_FULL -> transport_handle_queue_full
This patch adds SCF_EMULATE_QUEUE_FULL support using -EAGAIN failures
via transport_handle_queue_full() to signal queue full in completion
path TFO->queue_data_in() and TFO->queue_status() callbacks.

This is done using a new se_cmd->transport_qf_callback() to handle
the following queue full exception cases within target core:

*) TRANSPORT_COMPLETE_OK (for completion path queue full)

*) TRANSPORT_COMPLETE_QF_WP (for TRANSPORT_WRITE_PENDING queue full)

*) transport_send_check_condition_and_sense() failure paths in
   transport_generic_request_failure() and transport_generic_complete_ok()

All logic is driven using se_device->qf_work_queue -> target_qf_do_work()
to to requeue outstanding se_cmd at the head of se_dev->queue_obj->qobj_list
for transport_processing_thread() execution.

Tested using tcm_qla2xxx with MAX_OUTSTANDING_COMMANDS=128 for FCP READ
to trigger the TRANSPORT_COMPLETE_OK queue full cases, and a simulated
TFO->write_pending() -EAGAIN failure to trigger TRANSPORT_COMPLETE_QF_WP.

Reported-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2011-07-22 09:37:45 +00:00
..
acpi Merge branches 'd3cold', 'bugzilla-37412' and 'bugzilla-38152' into release 2011-07-14 00:16:38 -04:00
asm-generic
crypto
drm drm/radeon/kms: add new NI pci ids 2011-07-15 16:10:55 +01:00
keys
linux Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2011-07-20 15:56:25 -07:00
math-emu
media [media] tuner-core/v4l2-subdev: document that the type field has to be filled in 2011-07-07 15:04:23 -03:00
mtd
net sctp: ABORT if receive, reassmbly, or reodering queue is not empty while closing socket 2011-07-08 09:53:08 -07:00
pcmcia
rdma
rxrpc
scsi
sound ALSA: sb16 - Fix build errors on MIPS and others with 13bit ioctl size 2011-06-30 15:33:57 +02:00
target target: Add SCF_EMULATE_QUEUE_FULL -> transport_handle_queue_full 2011-07-22 09:37:45 +00:00
trace Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 2011-06-21 10:22:35 -07:00
video
xen
Kbuild