diff options
| author | Keith Busch <keith.busch@intel.com> | 2016-07-12 23:20:31 (GMT) |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-07-12 23:20:31 (GMT) |
| commit | f80ec966c19b78af4360e26e32e1ab775253105f (patch) | |
| tree | d8aacd28080c9c48ee7afef3753fa9f4c1840a19 /drivers/nvme/host/nvme.h | |
| parent | 7a6497378ae832daa1668a10be04ebdacd60468b (diff) | |
| download | linux-f80ec966c19b78af4360e26e32e1ab775253105f.tar.xz | |
nvme: Limit command retries
Many controller implementations will return errors to commands that will
not succeed, but without the DNR bit set. The driver previously retried
these commands an unlimited number of times until the command timeout
has exceeded, which takes an unnecessarilly long period of time.
This patch limits the number of retries a command can have, defaulting
to 5, but is user tunable at load or runtime.
The struct request's 'retries' field is used to track the number of
retries attempted. This is in contrast with scsi's use of this field,
which indicates how many retries are allowed.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/nvme/host/nvme.h')
| -rw-r--r-- | drivers/nvme/host/nvme.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 1bd42d5..ab18b78 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -41,6 +41,8 @@ extern unsigned char shutdown_timeout; #define NVME_DEFAULT_KATO 5 #define NVME_KATO_GRACE 10 +extern unsigned int nvme_max_retries; + enum { NVME_NS_LBA = 0, NVME_NS_LIGHTNVM = 1, @@ -239,7 +241,8 @@ static inline int nvme_error_status(u16 status) static inline bool nvme_req_needs_retry(struct request *req, u16 status) { return !(status & NVME_SC_DNR || blk_noretry_request(req)) && - (jiffies - req->start_time) < req->timeout; + (jiffies - req->start_time) < req->timeout && + req->retries < nvme_max_retries; } void nvme_cancel_request(struct request *req, void *data, bool reserved); |