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nvme: support traffic based keep-alive
If the controller supports traffic based keep alive, we restart the keep alive timer if any admin or io commands was completed during the kato period. This prevents a possible starvation of keep alive commands in the presence of heavy traffic as in such case, we already have a health indication from the host perspective. Only set a comp_seen indicator in case the controller supports keep alive to minimize the overhead for pci controllers. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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3 changed files with 15 additions and 0 deletions
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@ -251,6 +251,9 @@ void nvme_complete_rq(struct request *req)
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trace_nvme_complete_rq(req);
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if (nvme_req(req)->ctrl->kas)
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nvme_req(req)->ctrl->comp_seen = true;
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if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) {
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if ((req->cmd_flags & REQ_NVME_MPATH) &&
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blk_path_error(status)) {
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@ -839,6 +842,7 @@ static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status)
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return;
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}
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ctrl->comp_seen = false;
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schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
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}
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@ -863,6 +867,15 @@ static void nvme_keep_alive_work(struct work_struct *work)
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{
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struct nvme_ctrl *ctrl = container_of(to_delayed_work(work),
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struct nvme_ctrl, ka_work);
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bool comp_seen = ctrl->comp_seen;
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if ((ctrl->ctratt & NVME_CTRL_ATTR_TBKAS) && comp_seen) {
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dev_dbg(ctrl->device,
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"reschedule traffic based keep-alive timer\n");
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ctrl->comp_seen = false;
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schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
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return;
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}
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if (nvme_keep_alive(ctrl)) {
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/* allocation failure, reset the controller */
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@ -145,6 +145,7 @@ enum nvme_ctrl_state {
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};
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struct nvme_ctrl {
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bool comp_seen;
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enum nvme_ctrl_state state;
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bool identified;
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spinlock_t lock;
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@ -200,6 +200,7 @@ enum {
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enum nvme_ctrl_attr {
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NVME_CTRL_ATTR_HID_128_BIT = (1 << 0),
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NVME_CTRL_ATTR_TBKAS = (1 << 6),
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};
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struct nvme_id_ctrl {
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