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nvme: support command retry delay for admin command

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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: Minwoo Im <minwoo.im.dev@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Minwoo Im 2021-01-08 23:46:57 +09:00 committed by Christoph Hellwig
parent 60b152a508
commit f9063a5327
1 changed files with 2 additions and 3 deletions
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5
drivers/nvme/host/core.c
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@ -279,14 +279,13 @@ static blk_status_t nvme_error_status(u16 status)
static void nvme_retry_req(struct request *req) static void nvme_retry_req(struct request *req)
{ {
struct nvme_ns *ns = req->q->queuedata;
unsigned long delay = 0; unsigned long delay = 0;
u16 crd; u16 crd;
/* The mask and shift result must be <= 3 */ /* The mask and shift result must be <= 3 */
crd = (nvme_req(req)->status & NVME_SC_CRD) >> 11; crd = (nvme_req(req)->status & NVME_SC_CRD) >> 11;
if (ns && crd) if (crd)
delay = ns->ctrl->crdt[crd - 1] * 100; delay = nvme_req(req)->ctrl->crdt[crd - 1] * 100;
nvme_req(req)->retries++; nvme_req(req)->retries++;
blk_mq_requeue_request(req, false); blk_mq_requeue_request(req, false);