Commit f9063a53 authored by Minwoo Im's avatar Minwoo Im Committed by Christoph Hellwig
Browse files

nvme: support command retry delay for admin command 



The controller can request a delay retrying a failed command by setting
the Command Retry Delay (CRD) field in the Completion Queue Entry.

Currentlty this features is only applied to commands on the I/O queue, but
not to commands on the admin queue.  Retreive the nvme_ctrl from the
request so that no namespace is required and apply the feature to all
commands.

Signed-off-by: default avatarMinwoo Im <minwoo.im.dev@gmail.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 60b152a5

drivers/nvme/host/core.c

+2 −3
Original line number Diff line number Diff line
@@ -279,14 +279,13 @@ static blk_status_t nvme_error_status(u16 status) 


static void nvme_retry_req(struct request *req)

{

	struct nvme_ns *ns = req->q->queuedata;

	unsigned long delay = 0;

	u16 crd;



	/* The mask and shift result must be <= 3 */

	crd = (nvme_req(req)->status & NVME_SC_CRD) >> 11;

	if (ns && crd)

		delay = ns->ctrl->crdt[crd - 1] * 100;

	if (crd)

		delay = nvme_req(req)->ctrl->crdt[crd - 1] * 100;



	nvme_req(req)->retries++;

	blk_mq_requeue_request(req, false);