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Petersen" , John Meneghini , Chris Leech , linux-kernel@vger.kernel.org, Mohamed Khalfella , Jesse Taube Subject: [PATCH v2] nvmet: Add traffic based keep alive support to configfs Date: Wed, 23 Sep 2026 16:20:03 -0400 Message-ID: <20260923202003.1776271-1-jtaubepe@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Add the ability to turn on and off tbkas (traffic based keep alive support) via configfs. This is useful for testing and debugging. Signed-off-by: Jesse Taube V1 -> V2: - Add tbkas to nvmet_ctrl - Force reconnect controllers when tbkas is set - Use ctrl->tbkas in nvmet_execute_identify_ctrl and nvmet_req_init --- drivers/nvme/target/admin-cmd.c | 4 +++- drivers/nvme/target/configfs.c | 29 +++++++++++++++++++++++++++++ drivers/nvme/target/core.c | 4 +++- drivers/nvme/target/nvmet.h | 2 ++ 4 files changed, 37 insertions(+), 2 deletions(-) diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c index 7764a3c0195c..26028be8fe4d 100644 --- a/drivers/nvme/target/admin-cmd.c +++ b/drivers/nvme/target/admin-cmd.c @@ -696,7 +696,9 @@ 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); - ctratt = NVME_CTRL_ATTR_HID_128_BIT | NVME_CTRL_ATTR_TBKAS; + ctratt = NVME_CTRL_ATTR_HID_128_BIT; + if (ctrl->tbkas) + ctratt |= NVME_CTRL_ATTR_TBKAS; if (nvmet_is_pci_ctrl(ctrl)) ctratt |= NVME_CTRL_ATTR_RHII; id->ctratt = cpu_to_le32(ctratt); diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c index 6286e38436dd..2b879b1d4c3c 100644 --- a/drivers/nvme/target/configfs.c +++ b/drivers/nvme/target/configfs.c @@ -1369,6 +1369,34 @@ static ssize_t nvmet_subsys_attr_serial_store(struct config_item *item, } CONFIGFS_ATTR(nvmet_subsys_, attr_serial); +static ssize_t nvmet_subsys_attr_tbkas_show(struct config_item *item, + char *page) +{ + return snprintf(page, PAGE_SIZE, "%d\n", to_subsys(item)->tbkas); +} + +static ssize_t nvmet_subsys_attr_tbkas_store(struct config_item *item, + const char *page, size_t count) +{ + struct nvmet_subsys *subsys = to_subsys(item); + struct nvmet_ctrl *ctrl; + bool tbkas; + + if (kstrtobool(page, &tbkas)) + return -EINVAL; + + down_write(&nvmet_config_sem); + subsys->tbkas = tbkas; + + /* Force reconnect */ + list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) + ctrl->ops->delete_ctrl(ctrl); + up_write(&nvmet_config_sem); + + return count; +} +CONFIGFS_ATTR(nvmet_subsys_, attr_tbkas); + static ssize_t nvmet_subsys_attr_cntlid_min_show(struct config_item *item, char *page) { @@ -1706,6 +1734,7 @@ static struct configfs_attribute *nvmet_subsys_attrs[] = { &nvmet_subsys_attr_attr_qid_max, &nvmet_subsys_attr_attr_ieee_oui, &nvmet_subsys_attr_attr_firmware, + &nvmet_subsys_attr_attr_tbkas, #ifdef CONFIG_BLK_DEV_INTEGRITY &nvmet_subsys_attr_attr_pi_enable, #endif diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index 43871a8f56ca..6b4bda231bd9 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -1227,7 +1227,7 @@ bool nvmet_req_init(struct nvmet_req *req, struct nvmet_sq *sq, goto fail; } - if (sq->ctrl) + if (sq->ctrl && sq->ctrl->tbkas) sq->ctrl->reset_tbkas = true; return true; @@ -1677,6 +1677,7 @@ struct nvmet_ctrl *nvmet_alloc_ctrl(struct nvmet_alloc_ctrl_args *args) mutex_lock(&subsys->lock); ctrl->max_qid = subsys->max_qid; + ctrl->tbkas = subsys->tbkas; ctrl->sqs = kzalloc_objs(struct nvmet_sq *, ctrl->max_qid + 1); if (!ctrl->sqs) @@ -1865,6 +1866,7 @@ struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn, } subsys->ieee_oui = 0; + subsys->tbkas = true; subsys->firmware_rev = kstrndup(UTS_RELEASE, NVMET_FR_MAX_SIZE, GFP_KERNEL); if (!subsys->firmware_rev) { diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h index dbda55895f4f..2bc0e87ea981 100644 --- a/drivers/nvme/target/nvmet.h +++ b/drivers/nvme/target/nvmet.h @@ -270,6 +270,7 @@ struct nvmet_ctrl { u16 cntlid; u16 max_qid; u32 kato; + bool tbkas; struct nvmet_port *port; @@ -343,6 +344,7 @@ struct nvmet_subsys { bool subsys_discovered; char *subsysnqn; bool pi_support; + bool tbkas; struct config_group group; -- 2.55.0