WSL2-Linux-Kernel/drivers/nvme/target
Chaitanya Kulkarni 150dfb6c83 nvmet: don't use BLK_MQ_REQ_NOWAIT for passthru
By default, we set the passthru request allocation flag such that it
returns the error in the following code path and we fail the I/O when
BLK_MQ_REQ_NOWAIT is used for request allocation :-

nvme_alloc_request()
 blk_mq_alloc_request()
  blk_mq_queue_enter()
   if (flag & BLK_MQ_REQ_NOWAIT)
        return -EBUSY; <-- return if busy.

On some controllers using BLK_MQ_REQ_NOWAIT ends up in I/O error where
the controller is perfectly healthy and not in a degraded state.

Block layer request allocation does allow us to wait instead of
immediately returning the error when we BLK_MQ_REQ_NOWAIT flag is not
used. This has shown to fix the I/O error problem reported under
heavy random write workload.

Remove the BLK_MQ_REQ_NOWAIT parameter for passthru request allocation
which resolves this issue.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2020-10-22 15:28:02 +02:00
..
Kconfig nvmet: introduce the passthru Kconfig option 2020-07-29 07:45:21 +02:00
Makefile nvmet: add passthru code to process commands 2020-07-29 07:45:21 +02:00
admin-cmd.c nvmet: handle keep-alive timer when kato is modified by a set features cmd 2020-09-27 09:14:19 +02:00
configfs.c nvmet: fix a memory leak 2020-08-21 17:14:27 -06:00
core.c nvmet: fix uninitialized work for zero kato 2020-10-22 15:27:14 +02:00
discovery.c nvmet: introduce flags member in nvmet_fabrics_ops 2020-07-08 16:16:17 +02:00
fabrics-cmd.c nvmet: add metadata/T10-PI support 2020-05-27 07:12:40 +02:00
fc.c nvmet-fc: fix missing check for no hostport struct 2020-09-27 09:14:19 +02:00
fcloop.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
io-cmd-bdev.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
io-cmd-file.c nvmet: rename nvmet_check_data_len to nvmet_check_transfer_len 2020-05-27 07:12:39 +02:00
loop.c nvme-loop: don't put ctrl on nvme_init_ctrl error 2020-10-07 07:56:16 +02:00
nvmet.h nvmet: handle keep-alive timer when kato is modified by a set features cmd 2020-09-27 09:14:19 +02:00
passthru.c nvmet: don't use BLK_MQ_REQ_NOWAIT for passthru 2020-10-22 15:28:02 +02:00
rdma.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
tcp.c nvmet-tcp: have queue io_work context run on sock incoming cpu 2020-09-27 09:14:18 +02:00
trace.c nvmet: trace: parse Get LBA Status command in detail 2019-08-29 12:55:01 -07:00
trace.h nvmet: add async event tracing support 2020-05-27 07:12:38 +02:00