From nobody Tue Dec 16 20:53:07 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DBDB725EF8B for ; Mon, 24 Mar 2025 12:08:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742818093; cv=none; b=kMJns3hvGV8j45UCd5o35voo7xAuIkGpzJ8R1BBo4F9UssiHUmeHXozXjEFZpO0GyQaPczvpBl4GRburgMV5ki0mdA450CKtN/5AJ4cBucxoQjDZawaBf/GDG+xSd+a4Sjq3d+EmXb400sbHfC0PnM1kLb78pzXqyWRq/nwNugo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742818093; c=relaxed/simple; bh=lQUzCkgG/COzR/pHntbS6EXiWn+eykoAt4Nb+HdA+EM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=BJNtlRmhtQitfoWnXY16/0i1Ap1+SxxWh/A0aHrI720AVRy9XPD1jWLTZKHfa2eszkqiKlQT3/uY47oybWrWJlnvEslNtvrgYSp/f0gKhyaibHP5fjq5LSmEJFCzdDk7B5/c4GZJUPoYcKIrRbWysVJ45tRMbksL6FN71tt2s98= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AJZEk1Xm; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AJZEk1Xm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1BBD0C4CEDD; Mon, 24 Mar 2025 12:08:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1742818093; bh=lQUzCkgG/COzR/pHntbS6EXiWn+eykoAt4Nb+HdA+EM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=AJZEk1XmJh89GyNWx9VFhzXmUSRY4tcC16wczJgPmUNWl/TFU/ZWc1+EIVthB8QZj 4kgnQp+zCK9pkGeb8QSB0bVtxzZcdVAnXG83idm1y95ya4EzxgPpGlHJnmN1IHKZYm MNiAHVNVKwK7P+jFHMMS5C3nGPyOVWAoHOQnEdttwqB4tSHlOMmydblnc1ynIC/iWd dirP71mB2cSCGv5X982nfndBhM6tgfZZA+kYlUz9WFiMcS9K8wkh4SkenLvvBT+q+Q pI2FCLp4MFITPgJMbVWrgk/JEIFSEHXywaYDey3pROIDL82FN/4+P2+0V9/7+YMoXG /jKToq7rz5AsQ== From: Daniel Wagner Date: Mon, 24 Mar 2025 13:07:58 +0100 Subject: [PATCH RFC 3/3] nvme: delay failover by command quiesce timeout Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250324-tp4129-v1-3-95a747b4c33b@kernel.org> References: <20250324-tp4129-v1-0-95a747b4c33b@kernel.org> In-Reply-To: <20250324-tp4129-v1-0-95a747b4c33b@kernel.org> To: Christoph Hellwig , Sagi Grimberg , Keith Busch , Hannes Reinecke , John Meneghini , randyj@purestorage.com, Mohamed Khalfella Cc: linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, Daniel Wagner X-Mailer: b4 0.14.2 The TP4129 mendates that the failover should be delayed by CQT. Thus when nvme_decide_disposition returns FAILOVER do not immediately re-queue it on the namespace level instead queue it on the ctrl's request_list and moved later to the namespace's requeue_list. Signed-off-by: Daniel Wagner --- drivers/nvme/host/core.c | 19 ++++++++++++++++ drivers/nvme/host/fc.c | 4 ++++ drivers/nvme/host/multipath.c | 52 +++++++++++++++++++++++++++++++++++++++= +--- drivers/nvme/host/nvme.h | 15 +++++++++++++ drivers/nvme/host/rdma.c | 2 ++ drivers/nvme/host/tcp.c | 1 + 6 files changed, 90 insertions(+), 3 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 135045528ea1c79eac0d6d47d5f7f05a7c98acc4..f3155c7735e75e06c4359c26db8= 931142c067e1d 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -239,6 +239,7 @@ static void nvme_do_delete_ctrl(struct nvme_ctrl *ctrl) =20 flush_work(&ctrl->reset_work); nvme_stop_ctrl(ctrl); + nvme_flush_failover(ctrl); nvme_remove_namespaces(ctrl); ctrl->ops->delete_ctrl(ctrl); nvme_uninit_ctrl(ctrl); @@ -1310,6 +1311,19 @@ static void nvme_queue_keep_alive_work(struct nvme_c= trl *ctrl) queue_delayed_work(nvme_wq, &ctrl->ka_work, delay); } =20 +void nvme_schedule_failover(struct nvme_ctrl *ctrl) +{ + unsigned long delay; + + if (ctrl->cqt) + delay =3D msecs_to_jiffies(ctrl->cqt); + else + delay =3D ctrl->kato * HZ; + + queue_delayed_work(nvme_wq, &ctrl->failover_work, delay); +} +EXPORT_SYMBOL_GPL(nvme_schedule_failover); + static enum rq_end_io_ret nvme_keep_alive_end_io(struct request *rq, blk_status_t status) { @@ -1336,6 +1350,8 @@ static enum rq_end_io_ret nvme_keep_alive_end_io(stru= ct request *rq, dev_err(ctrl->device, "failed nvme_keep_alive_end_io error=3D%d\n", status); + + nvme_schedule_failover(ctrl); return RQ_END_IO_NONE; } =20 @@ -4716,6 +4732,7 @@ EXPORT_SYMBOL_GPL(nvme_remove_io_tag_set); =20 void nvme_stop_ctrl(struct nvme_ctrl *ctrl) { + nvme_schedule_failover(ctrl); nvme_mpath_stop(ctrl); nvme_auth_stop(ctrl); nvme_stop_failfast_work(ctrl); @@ -4842,6 +4859,8 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct dev= ice *dev, =20 INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work); INIT_DELAYED_WORK(&ctrl->failfast_work, nvme_failfast_work); + INIT_DELAYED_WORK(&ctrl->failover_work, nvme_failover_work); + INIT_LIST_HEAD(&ctrl->failover_list); memset(&ctrl->ka_cmd, 0, sizeof(ctrl->ka_cmd)); ctrl->ka_cmd.common.opcode =3D nvme_admin_keep_alive; ctrl->ka_last_check_time =3D jiffies; diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c index cdc1ba277a5c23ef1afd26e6911b082f3d12b215..bd897b29cd286008b781bbcb423= 0e08019da6b6b 100644 --- a/drivers/nvme/host/fc.c +++ b/drivers/nvme/host/fc.c @@ -2553,6 +2553,8 @@ nvme_fc_error_recovery(struct nvme_fc_ctrl *ctrl, cha= r *errmsg) { enum nvme_ctrl_state state =3D nvme_ctrl_state(&ctrl->ctrl); =20 + nvme_schedule_failover(&ctrl->ctrl); + /* * if an error (io timeout, etc) while (re)connecting, the remote * port requested terminating of the association (disconnect_ls) @@ -3378,6 +3380,8 @@ nvme_fc_reset_ctrl_work(struct work_struct *work) /* will block will waiting for io to terminate */ nvme_fc_delete_association(ctrl); =20 + nvme_schedule_failover(&ctrl->ctrl); + if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) dev_err(ctrl->ctrl.device, "NVME-FC{%d}: error_recovery: Couldn't change state " diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index 2a7635565083046c575efe1793362ae10581defd..a14b055796b982df96609f53174= a5d1334c1c0c4 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -86,9 +86,11 @@ void nvme_mpath_start_freeze(struct nvme_subsystem *subs= ys) void nvme_failover_req(struct request *req) { struct nvme_ns *ns =3D req->q->queuedata; + struct nvme_ctrl *ctrl =3D nvme_req(req)->ctrl; u16 status =3D nvme_req(req)->status & NVME_SCT_SC_MASK; unsigned long flags; struct bio *bio; + enum nvme_ctrl_state state =3D nvme_ctrl_state(ctrl); =20 nvme_mpath_clear_current_path(ns); =20 @@ -121,9 +123,53 @@ void nvme_failover_req(struct request *req) blk_steal_bios(&ns->head->requeue_list, req); spin_unlock_irqrestore(&ns->head->requeue_lock, flags); =20 - nvme_req(req)->status =3D 0; - nvme_end_req(req); - kblockd_schedule_work(&ns->head->requeue_work); + spin_lock_irqsave(&ctrl->lock, flags); + list_add_tail(&req->queuelist, &ctrl->failover_list); + spin_unlock_irqrestore(&ctrl->lock, flags); + + if (state =3D=3D NVME_CTRL_DELETING) { + /* + * request which fail over in the DELETING state were + * canceled and blk_mq_tagset_wait_completed_request will + * block until they have been proceed. Though + * nvme_failover_work is already stopped. Thus schedule + * a failover; it's still necessary to delay these commands + * by CQT. + */ + nvme_schedule_failover(ctrl); + } +} + +void nvme_flush_failover(struct nvme_ctrl *ctrl) +{ + LIST_HEAD(failover_list); + struct request *rq; + bool kick =3D false; + + spin_lock_irq(&ctrl->lock); + list_splice_init(&ctrl->failover_list, &failover_list); + spin_unlock_irq(&ctrl->lock); + + while (!list_empty(&failover_list)) { + rq =3D list_entry(failover_list.next, + struct request, queuelist); + list_del_init(&rq->queuelist); + + nvme_req(rq)->status =3D 0; + nvme_end_req(rq); + kick =3D true; + } + + if (kick) + nvme_kick_requeue_lists(ctrl); +} + +void nvme_failover_work(struct work_struct *work) +{ + struct nvme_ctrl *ctrl =3D container_of(to_delayed_work(work), + struct nvme_ctrl, failover_work); + + nvme_flush_failover(ctrl); } =20 void nvme_mpath_start_request(struct request *rq) diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 7563332b5b7b76fc6165ec8c6f2d144737d4fe85..10eb323bdaf139526959180c1e6= 6ab4579bb145d 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -411,6 +411,9 @@ struct nvme_ctrl { =20 enum nvme_ctrl_type cntrltype; enum nvme_dctype dctype; + + struct delayed_work failover_work; + struct list_head failover_list; }; =20 static inline enum nvme_ctrl_state nvme_ctrl_state(struct nvme_ctrl *ctrl) @@ -954,6 +957,9 @@ void nvme_mpath_wait_freeze(struct nvme_subsystem *subs= ys); void nvme_mpath_start_freeze(struct nvme_subsystem *subsys); void nvme_mpath_default_iopolicy(struct nvme_subsystem *subsys); void nvme_failover_req(struct request *req); +void nvme_failover_work(struct work_struct *work); +void nvme_schedule_failover(struct nvme_ctrl *ctrl); +void nvme_flush_failover(struct nvme_ctrl *ctrl); void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl); int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head= ); void nvme_mpath_add_disk(struct nvme_ns *ns, __le32 anagrpid); @@ -996,6 +1002,15 @@ static inline bool nvme_ctrl_use_ana(struct nvme_ctrl= *ctrl) static inline void nvme_failover_req(struct request *req) { } +static inline void nvme_failover_work(struct work_struct *work) +{ +} +static inline void nvme_schedule_failover(struct nvme_ctrl *ctrl) +{ +} +static inline void nvme_flush_failover(struct nvme_ctrl *ctrl) +{ +} static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl) { } diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index 86a2891d9bcc7a990cd214a7fe93fa5c55b292c7..9bee376f881b4c3ebe5502abf23= a8e76829780ff 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -1127,6 +1127,7 @@ static void nvme_rdma_error_recovery_work(struct work= _struct *work) =20 nvme_stop_keep_alive(&ctrl->ctrl); flush_work(&ctrl->ctrl.async_event_work); + nvme_schedule_failover(&ctrl->ctrl); nvme_rdma_teardown_io_queues(ctrl, false); nvme_unquiesce_io_queues(&ctrl->ctrl); nvme_rdma_teardown_admin_queue(ctrl, false); @@ -2153,6 +2154,7 @@ static const struct blk_mq_ops nvme_rdma_admin_mq_ops= =3D { =20 static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shut= down) { + nvme_schedule_failover(&ctrl->ctrl); nvme_rdma_teardown_io_queues(ctrl, shutdown); nvme_quiesce_admin_queue(&ctrl->ctrl); nvme_disable_ctrl(&ctrl->ctrl, shutdown); diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index d0023bcfd8a79a193adf2807a24481c8c164a174..3a6c1d3febaf233996e4dcf6847= 93327b5d1412f 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -2345,6 +2345,7 @@ static void nvme_tcp_error_recovery_work(struct work_= struct *work) =20 nvme_stop_keep_alive(ctrl); flush_work(&ctrl->async_event_work); + nvme_schedule_failover(ctrl); nvme_tcp_teardown_io_queues(ctrl, false); /* unquiesce to fail fast pending requests */ nvme_unquiesce_io_queues(ctrl); --=20 2.48.1