diff options
| author | Hannes Reinecke <hare@suse.de> | 2021-04-16 13:46:20 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2021-04-21 19:13:15 +0200 |
| commit | a70b81bd4d9d2d6c05cfe6ef2a10bccc2e04357a (patch) | |
| tree | b8bf44fd9e9a4f1d7a8c2cc34d10743e33490af4 /drivers/nvme/host/core.c | |
| parent | 8f864c595bed20ef85fef3e7314212b73800d51d (diff) | |
nvme: sanitize KATO setting
According to the NVMe base spec the KATO commands should be sent
at half of the KATO interval, to properly account for round-trip
times.
As we now will only ever send one KATO command per connection we
can easily use the recommended values.
This also fixes a potential issue where the request timeout for
the KATO command does not match the value in the connect command,
which might be causing spurious connection drops from the target.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme/host/core.c')
| -rw-r--r-- | drivers/nvme/host/core.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 40f08e6325ef..0cb097cd6a8e 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -1109,6 +1109,17 @@ void nvme_execute_passthru_rq(struct request *rq) } EXPORT_SYMBOL_NS_GPL(nvme_execute_passthru_rq, NVME_TARGET_PASSTHRU); +/* + * Recommended frequency for KATO commands per NVMe 1.4 section 7.12.1: + * + * The host should send Keep Alive commands at half of the Keep Alive Timeout + * accounting for transport roundtrip times [..]. + */ +static void nvme_queue_keep_alive_work(struct nvme_ctrl *ctrl) +{ + queue_delayed_work(nvme_wq, &ctrl->ka_work, ctrl->kato * HZ / 2); +} + static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status) { struct nvme_ctrl *ctrl = rq->end_io_data; @@ -1131,7 +1142,7 @@ static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status) startka = true; spin_unlock_irqrestore(&ctrl->lock, flags); if (startka) - queue_delayed_work(nvme_wq, &ctrl->ka_work, ctrl->kato * HZ); + nvme_queue_keep_alive_work(ctrl); } static int nvme_keep_alive(struct nvme_ctrl *ctrl) @@ -1161,7 +1172,7 @@ static void nvme_keep_alive_work(struct work_struct *work) dev_dbg(ctrl->device, "reschedule traffic based keep-alive timer\n"); ctrl->comp_seen = false; - queue_delayed_work(nvme_wq, &ctrl->ka_work, ctrl->kato * HZ); + nvme_queue_keep_alive_work(ctrl); return; } @@ -1178,7 +1189,7 @@ static void nvme_start_keep_alive(struct nvme_ctrl *ctrl) if (unlikely(ctrl->kato == 0)) return; - queue_delayed_work(nvme_wq, &ctrl->ka_work, ctrl->kato * HZ); + nvme_queue_keep_alive_work(ctrl); } void nvme_stop_keep_alive(struct nvme_ctrl *ctrl) |