From c09305ae49970e15cd18828c0f78b766e8cf224f Mon Sep 17 00:00:00 2001 From: Sagi Grimberg Date: Fri, 2 Nov 2018 10:28:13 -0700 Subject: [PATCH] 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: Sagi Grimberg Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe --- drivers/nvme/target/admin-cmd.c | 3 ++- drivers/nvme/target/core.c | 12 ++++++++++++ drivers/nvme/target/nvmet.h | 2 ++ 3 files changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c index 30778ffc46f5..c9c6d25a3ec2 100644 --- a/drivers/nvme/target/admin-cmd.c +++ b/drivers/nvme/target/admin-cmd.c @@ -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; diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index a5f9bbce863f..05d8d9bc058f 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -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: diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h index c2b4d9ee6391..860218edeb6c 100644 --- a/drivers/nvme/target/nvmet.h +++ b/drivers/nvme/target/nvmet.h @@ -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; -- 2.45.2