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Sat, 11 Jul 2026 19:25:45 -0700 (PDT) Received: from ceto.lan ([2607:fb90:9c20:2264::1c31]) by smtp.googlemail.com with ESMTPSA id 5a478bee46e88-3117462f5c7sm60704693eec.0.2026.07.11.19.25.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 11 Jul 2026 19:25:45 -0700 (PDT) From: Mohamed Khalfella To: Justin Tee , Naresh Gottumukkala , Paul Ely , Chaitanya Kulkarni , Christoph Hellwig , Jens Axboe , Keith Busch , Sagi Grimberg , James Smart , Hannes Reinecke , Randy Jennings , Dhaval Giani Cc: Aaron Dailey , linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, Mohamed Khalfella Subject: [PATCH v5 16/16] nvme: Add support for CQT to nvme host Date: Sat, 11 Jul 2026 19:23:37 -0700 Message-ID: <20260712022437.3743117-17-mkhalfella@purestorage.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260712022437.3743117-1-mkhalfella@purestorage.com> References: <20260712022437.3743117-1-mkhalfella@purestorage.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260711_192546_797515_C77AC590 X-CRM114-Status: GOOD ( 18.37 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org TP4129 KATO Corrections and Clarifications defined CQT (Command Quiesce Time) which is used along with KATO (Keep Alive Timeout) to set an upper limit for attempting Cross-Controller Recovery. Add ctrl->cqt, read its value from controller identify response, expose it via sysfs, and have nvme_fence_timeout_ms() account for it. Use CQT to drive time-based recovery in fc, rdma, and tcp transports. Add a fenced_work delayed work to each transport controller. If CCR fails, fencing_work switches to error recovery immediately if CQT is not supported. Otherwise it schedules fenced_work after the remaining fence timeout, which also switches to error recovery when scheduled. Signed-off-by: Mohamed Khalfella --- drivers/nvme/host/core.c | 1 + drivers/nvme/host/fc.c | 41 +++++++++++++++++++++++++++++++++++---- drivers/nvme/host/nvme.h | 5 +++-- drivers/nvme/host/rdma.c | 41 +++++++++++++++++++++++++++++++++++---- drivers/nvme/host/sysfs.c | 2 ++ drivers/nvme/host/tcp.c | 41 +++++++++++++++++++++++++++++++++++---- 6 files changed, 117 insertions(+), 14 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 18de3805eff8..d3a2db50a89c 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3821,6 +3821,7 @@ static int nvme_init_identify(struct nvme_ctrl *ctrl) ctrl->ciu = id->ciu; ctrl->cirn = le64_to_cpu(id->cirn); ctrl->ccrl = id->ccrl; + ctrl->cqt = le16_to_cpu(id->cqt); ctrl->oacs = le16_to_cpu(id->oacs); ctrl->oncs = le16_to_cpu(id->oncs); diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c index 006b5a984dfe..dca7a26a4b15 100644 --- a/drivers/nvme/host/fc.c +++ b/drivers/nvme/host/fc.c @@ -167,6 +167,7 @@ struct nvme_fc_ctrl { struct blk_mq_tag_set tag_set; struct work_struct fencing_work; + struct delayed_work fenced_work; struct work_struct ioerr_work; struct delayed_work connect_work; @@ -1878,6 +1879,18 @@ __nvme_fc_fcpop_chk_teardowns(struct nvme_fc_ctrl *ctrl, return ret; } +static void nvme_fc_fenced_work(struct work_struct *work) +{ + struct nvme_fc_ctrl *fc_ctrl = container_of(to_delayed_work(work), + struct nvme_fc_ctrl, fenced_work); + struct nvme_ctrl *ctrl = &fc_ctrl->ctrl; + + dev_info(ctrl->device, "Time-based recovery finished\n"); + nvme_change_ctrl_state(ctrl, NVME_CTRL_FENCED); + if (nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING)) + queue_work(nvme_reset_wq, &fc_ctrl->ioerr_work); +} + static void nvme_fc_fencing_work(struct work_struct *work) { struct nvme_fc_ctrl *fc_ctrl = @@ -1886,14 +1899,33 @@ static void nvme_fc_fencing_work(struct work_struct *work) unsigned long rem; rem = nvme_fence_ctrl(ctrl); - if (rem) - dev_info(ctrl->device, "CCR failed, starting error recovery\n"); + if (!rem) + goto done; + + if (!ctrl->cqt) { + dev_info(ctrl->device, + "CCR failed, CQT not supported, skip time-based recovery\n"); + goto done; + } + + dev_info(ctrl->device, + "CCR failed, switch to time-based recovery, timeout = %ums\n", + jiffies_to_msecs(rem)); + queue_delayed_work(nvme_wq, &fc_ctrl->fenced_work, rem); + return; +done: nvme_change_ctrl_state(ctrl, NVME_CTRL_FENCED); if (nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING)) queue_work(nvme_reset_wq, &fc_ctrl->ioerr_work); } +static void nvme_fc_flush_fencing_works(struct nvme_fc_ctrl *ctrl) +{ + flush_work(&ctrl->fencing_work); + flush_delayed_work(&ctrl->fenced_work); +} + static void nvme_fc_ctrl_ioerr_work(struct work_struct *work) { @@ -1915,7 +1947,7 @@ nvme_fc_ctrl_ioerr_work(struct work_struct *work) return; } - flush_work(&ctrl->fencing_work); + nvme_fc_flush_fencing_works(ctrl); nvme_fc_error_recovery(ctrl); } @@ -3395,7 +3427,7 @@ nvme_fc_reset_ctrl_work(struct work_struct *work) struct nvme_fc_ctrl *ctrl = container_of(work, struct nvme_fc_ctrl, ctrl.reset_work); - flush_work(&ctrl->fencing_work); + nvme_fc_flush_fencing_works(ctrl); nvme_stop_ctrl(&ctrl->ctrl); /* will block will waiting for io to terminate */ @@ -3573,6 +3605,7 @@ nvme_fc_alloc_ctrl(struct device *dev, struct nvmf_ctrl_options *opts, INIT_WORK(&ctrl->ctrl.reset_work, nvme_fc_reset_ctrl_work); INIT_DELAYED_WORK(&ctrl->connect_work, nvme_fc_connect_ctrl_work); INIT_WORK(&ctrl->fencing_work, nvme_fc_fencing_work); + INIT_DELAYED_WORK(&ctrl->fenced_work, nvme_fc_fenced_work); INIT_WORK(&ctrl->ioerr_work, nvme_fc_ctrl_ioerr_work); spin_lock_init(&ctrl->lock); diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 578fedda9946..8ea7d22b78f8 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -392,6 +392,7 @@ struct nvme_ctrl { u32 max_zone_append; #endif u16 crdt[3]; + u16 cqt; u16 oncs; u8 dmrl; u8 ciu; @@ -1334,8 +1335,8 @@ static inline bool nvme_multi_css(struct nvme_ctrl *ctrl) static inline unsigned long nvme_fence_timeout_ms(struct nvme_ctrl *ctrl) { if (ctrl->ctratt & NVME_CTRL_ATTR_TBKAS) - return 3 * ctrl->kato * 1000; - return 2 * ctrl->kato * 1000; + return 3 * ctrl->kato * 1000 + ctrl->cqt; + return 2 * ctrl->kato * 1000 + ctrl->cqt; } #endif /* _NVME_H */ diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index 7c8108523980..3745b7242fce 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -113,6 +113,7 @@ struct nvme_rdma_ctrl { /* other member variables */ struct blk_mq_tag_set tag_set; struct work_struct fencing_work; + struct delayed_work fenced_work; struct work_struct err_work; struct nvme_rdma_qe async_event_sqe; @@ -1152,6 +1153,18 @@ static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work) nvme_rdma_reconnect_or_remove(ctrl, ret); } +static void nvme_rdma_fenced_work(struct work_struct *work) +{ + struct nvme_rdma_ctrl *rdma_ctrl = container_of(to_delayed_work(work), + struct nvme_rdma_ctrl, fenced_work); + struct nvme_ctrl *ctrl = &rdma_ctrl->ctrl; + + dev_info(ctrl->device, "Time-based recovery finished\n"); + nvme_change_ctrl_state(ctrl, NVME_CTRL_FENCED); + if (nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING)) + queue_work(nvme_reset_wq, &rdma_ctrl->err_work); +} + static void nvme_rdma_fencing_work(struct work_struct *work) { struct nvme_rdma_ctrl *rdma_ctrl = container_of(work, @@ -1160,20 +1173,39 @@ static void nvme_rdma_fencing_work(struct work_struct *work) unsigned long rem; rem = nvme_fence_ctrl(ctrl); - if (rem) - dev_info(ctrl->device, "CCR failed, starting error recovery\n"); + if (!rem) + goto done; + + if (!ctrl->cqt) { + dev_info(ctrl->device, + "CCR failed, CQT not supported, skip time-based recovery\n"); + goto done; + } + + dev_info(ctrl->device, + "CCR failed, switch to time-based recovery, timeout = %ums\n", + jiffies_to_msecs(rem)); + queue_delayed_work(nvme_wq, &rdma_ctrl->fenced_work, rem); + return; +done: nvme_change_ctrl_state(ctrl, NVME_CTRL_FENCED); if (nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING)) queue_work(nvme_reset_wq, &rdma_ctrl->err_work); } +static void nvme_rdma_flush_fencing_works(struct nvme_rdma_ctrl *ctrl) +{ + flush_work(&ctrl->fencing_work); + flush_delayed_work(&ctrl->fenced_work); +} + static void nvme_rdma_error_recovery_work(struct work_struct *work) { struct nvme_rdma_ctrl *ctrl = container_of(work, struct nvme_rdma_ctrl, err_work); - flush_work(&ctrl->fencing_work); + nvme_rdma_flush_fencing_works(ctrl); nvme_stop_keep_alive(&ctrl->ctrl); flush_work(&ctrl->ctrl.async_event_work); nvme_rdma_teardown_io_queues(ctrl, false); @@ -2226,7 +2258,7 @@ static void nvme_rdma_reset_ctrl_work(struct work_struct *work) container_of(work, struct nvme_rdma_ctrl, ctrl.reset_work); int ret; - flush_work(&ctrl->fencing_work); + nvme_rdma_flush_fencing_works(ctrl); nvme_stop_ctrl(&ctrl->ctrl); nvme_rdma_shutdown_ctrl(ctrl, false); @@ -2348,6 +2380,7 @@ static struct nvme_rdma_ctrl *nvme_rdma_alloc_ctrl(struct device *dev, INIT_DELAYED_WORK(&ctrl->reconnect_work, nvme_rdma_reconnect_ctrl_work); INIT_WORK(&ctrl->fencing_work, nvme_rdma_fencing_work); + INIT_DELAYED_WORK(&ctrl->fenced_work, nvme_rdma_fenced_work); INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work); INIT_WORK(&ctrl->ctrl.reset_work, nvme_rdma_reset_ctrl_work); diff --git a/drivers/nvme/host/sysfs.c b/drivers/nvme/host/sysfs.c index 3853c9a6356e..7479cd370584 100644 --- a/drivers/nvme/host/sysfs.c +++ b/drivers/nvme/host/sysfs.c @@ -486,6 +486,7 @@ nvme_show_int_function(numa_node); nvme_show_int_function(queue_count); nvme_show_int_function(sqsize); nvme_show_int_function(kato); +nvme_show_int_function(cqt); static ssize_t nvme_sysfs_ciu_show(struct device *dev, struct device_attribute *attr, @@ -966,6 +967,7 @@ static struct attribute *nvme_dev_attrs[] = { &dev_attr_sqsize.attr, &dev_attr_ciu.attr, &dev_attr_cirn.attr, + &dev_attr_cqt.attr, &dev_attr_hostnqn.attr, &dev_attr_hostid.attr, &dev_attr_ctrl_loss_tmo.attr, diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index a1711dd1d3c2..13e250110c1b 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -162,6 +162,7 @@ struct nvme_tcp_ctrl { struct nvme_ctrl ctrl; struct work_struct fencing_work; + struct delayed_work fenced_work; struct work_struct err_work; struct delayed_work connect_work; struct nvme_tcp_request async_req; @@ -2501,6 +2502,18 @@ static void nvme_tcp_reconnect_ctrl_work(struct work_struct *work) nvme_tcp_reconnect_or_remove(ctrl, ret); } +static void nvme_tcp_fenced_work(struct work_struct *work) +{ + struct nvme_tcp_ctrl *tcp_ctrl = container_of(to_delayed_work(work), + struct nvme_tcp_ctrl, fenced_work); + struct nvme_ctrl *ctrl = &tcp_ctrl->ctrl; + + dev_info(ctrl->device, "Time-based recovery finished\n"); + nvme_change_ctrl_state(ctrl, NVME_CTRL_FENCED); + if (nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING)) + queue_work(nvme_reset_wq, &tcp_ctrl->err_work); +} + static void nvme_tcp_fencing_work(struct work_struct *work) { struct nvme_tcp_ctrl *tcp_ctrl = container_of(work, @@ -2509,21 +2522,40 @@ static void nvme_tcp_fencing_work(struct work_struct *work) unsigned long rem; rem = nvme_fence_ctrl(ctrl); - if (rem) - dev_info(ctrl->device, "CCR failed, starting error recovery\n"); + if (!rem) + goto done; + if (!ctrl->cqt) { + dev_info(ctrl->device, + "CCR failed, CQT not supported, skip time-based recovery\n"); + goto done; + } + + dev_info(ctrl->device, + "CCR failed, switch to time-based recovery, timeout = %ums\n", + jiffies_to_msecs(rem)); + queue_delayed_work(nvme_wq, &tcp_ctrl->fenced_work, rem); + return; + +done: nvme_change_ctrl_state(ctrl, NVME_CTRL_FENCED); if (nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING)) queue_work(nvme_reset_wq, &tcp_ctrl->err_work); } +static void nvme_tcp_flush_fencing_works(struct nvme_ctrl *ctrl) +{ + flush_work(&to_tcp_ctrl(ctrl)->fencing_work); + flush_delayed_work(&to_tcp_ctrl(ctrl)->fenced_work); +} + static void nvme_tcp_error_recovery_work(struct work_struct *work) { struct nvme_tcp_ctrl *tcp_ctrl = container_of(work, struct nvme_tcp_ctrl, err_work); struct nvme_ctrl *ctrl = &tcp_ctrl->ctrl; - flush_work(&to_tcp_ctrl(ctrl)->fencing_work); + nvme_tcp_flush_fencing_works(ctrl); if (nvme_tcp_key_revoke_needed(ctrl)) nvme_auth_revoke_tls_key(ctrl); nvme_stop_keep_alive(ctrl); @@ -2566,7 +2598,7 @@ static void nvme_reset_ctrl_work(struct work_struct *work) container_of(work, struct nvme_ctrl, reset_work); int ret; - flush_work(&to_tcp_ctrl(ctrl)->fencing_work); + nvme_tcp_flush_fencing_works(ctrl); if (nvme_tcp_key_revoke_needed(ctrl)) nvme_auth_revoke_tls_key(ctrl); nvme_stop_ctrl(ctrl); @@ -2956,6 +2988,7 @@ static struct nvme_tcp_ctrl *nvme_tcp_alloc_ctrl(struct device *dev, INIT_DELAYED_WORK(&ctrl->connect_work, nvme_tcp_reconnect_ctrl_work); INIT_WORK(&ctrl->fencing_work, nvme_tcp_fencing_work); + INIT_DELAYED_WORK(&ctrl->fenced_work, nvme_tcp_fenced_work); INIT_WORK(&ctrl->err_work, nvme_tcp_error_recovery_work); INIT_WORK(&ctrl->ctrl.reset_work, nvme_reset_ctrl_work); -- 2.54.0