diff options
| author | Kamaljit Singh <kamaljit.singh1@wdc.com> | 2025-07-21 10:36:59 -0700 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2025-07-31 06:35:44 -0700 |
| commit | e715b8733df60aa3280ab3e0de0560c8a72c5c1d (patch) | |
| tree | 14f2e8309d4df30eaa0d350c03766b154acad198 | |
| parent | c71fc0f457ca1c2cd4dff2d974df724beb14f67e (diff) | |
nvme: add capability to connect to an administrative controller
Add capability to connect to an administrative controller by
preventing ioq creation for admin-controllers.
Add a nvme_admin_ctrl() to check if a controller's CNTRLTYPE indicates
that it is an administrative controller and override ctrl->queue_count to
1 for admin controllers, so that only the admin queue and no I/O queues
are created for an administrative controller. This override is done in
nvme_init_ctrl_finish() after ctrl->cntrltype has been initialized in
nvme_init_identify() so nvme_admin_ctrl() will work correctly.
Doing this override in generic code (nvme_init_ctrl_finish) makes it
transport agnostic and will work properly for nvme/tcp as well as for
nvme/rdma.
Suggested-by: Niklas Cassel <cassel@kernel.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Kamaljit Singh <kamaljit.singh1@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
| -rw-r--r-- | drivers/nvme/host/core.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 9d988f4cb87a..812c1565114f 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3158,6 +3158,11 @@ static inline bool nvme_discovery_ctrl(struct nvme_ctrl *ctrl) return ctrl->opts && ctrl->opts->discovery_nqn; } +static inline bool nvme_admin_ctrl(struct nvme_ctrl *ctrl) +{ + return ctrl->cntrltype == NVME_CTRL_ADMIN; +} + static bool nvme_validate_cntlid(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) { @@ -3670,6 +3675,17 @@ int nvme_init_ctrl_finish(struct nvme_ctrl *ctrl, bool was_suspended) if (ret) return ret; + if (nvme_admin_ctrl(ctrl)) { + /* + * An admin controller has one admin queue, but no I/O queues. + * Override queue_count so it only creates an admin queue. + */ + dev_dbg(ctrl->device, + "Subsystem %s is an administrative controller", + ctrl->subsys->subnqn); + ctrl->queue_count = 1; + } + ret = nvme_configure_apst(ctrl); if (ret < 0) return ret; |