Commit c09305ae authored by Sagi Grimberg's avatar Sagi Grimberg Committed by Jens Axboe
Browse files

nvmet: support for traffic based keep-alive 



A controller that supports traffic based keep-alive can restart the keep
alive timer even when no keep-alive was not received in the kato period
as long as other admin or I/O commands were received.  For each command
set ctrl->cmd_seen to true, and when keep-alive timer expires, if any
commands were seen, resched ka_work instead of escalating to a fatal
error.

Signed-off-by: default avatarSagi Grimberg <sagi@grimberg.me>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 6e3ca03e

drivers/nvme/target/admin-cmd.c

+2 −1
Original line number Diff line number Diff line
@@ -304,7 +304,8 @@ static void nvmet_execute_identify_ctrl(struct nvmet_req *req) 


	/* XXX: figure out what to do about RTD3R/RTD3 */

	id->oaes = cpu_to_le32(NVMET_AEN_CFG_OPTIONAL);

	id->ctratt = cpu_to_le32(NVME_CTRL_ATTR_HID_128_BIT);

	id->ctratt = cpu_to_le32(NVME_CTRL_ATTR_HID_128_BIT |

		NVME_CTRL_ATTR_TBKAS);



	id->oacs = 0;

drivers/nvme/target/core.c

+12 −0
Original line number Diff line number Diff line
@@ -299,6 +299,15 @@ static void nvmet_keep_alive_timer(struct work_struct *work) 
{

	struct nvmet_ctrl *ctrl = container_of(to_delayed_work(work),

			struct nvmet_ctrl, ka_work);

	bool cmd_seen = ctrl->cmd_seen;



	ctrl->cmd_seen = false;

	if (cmd_seen) {

		pr_debug("ctrl %d reschedule traffic based keep-alive timer\n",

			ctrl->cntlid);

		schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);

		return;

	}



	pr_err("ctrl %d keep-alive timer (%d seconds) expired!\n",

		ctrl->cntlid, ctrl->kato);
@@ -801,6 +810,9 @@ bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq, 
		goto fail;

	}



	if (sq->ctrl)

		sq->ctrl->cmd_seen = true;



	return true;



fail:

drivers/nvme/target/nvmet.h

+2 −0
Original line number Diff line number Diff line
@@ -163,6 +163,8 @@ struct nvmet_ctrl { 
	struct nvmet_cq		**cqs;

	struct nvmet_sq		**sqs;



	bool			cmd_seen;



	struct mutex		lock;

	u64			cap;

	u32			cc;

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