linux-kernel - [PATCH v2 1/2] nvme-core: add method to check for an I/O controller

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Message-ID: <20250905232550.1950307-2-kamaljit.singh@opensource.wdc.com>
Date: Fri,  5 Sep 2025 16:25:49 -0700
From: Kamaljit Singh <kamaljit.singh@...nsource.wdc.com>
To: kbusch@...nel.org,
	axboe@...nel.dk,
	hch@....de,
	sagi@...mberg.me,
	linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: cassel@...nel.org,
	dlemoal@...nel.org,
	kamaljit.singh1@....com,
	Kamaljit Singh <kamaljit.singh@...nsource.wdc.com>
Subject: [PATCH v2 1/2] nvme-core: add method to check for an I/O controller

Add nvme_is_io_ctrl() to check if the controller is of type I/O
controller. Uses negative logic by excluding an administrative
controller and a discovery controller.

Signed-off-by: Kamaljit Singh <kamaljit.singh@...nsource.wdc.com>
---
 drivers/nvme/host/core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index d67545bd7abb..fab672e50510 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3167,6 +3167,11 @@ static inline bool nvme_admin_ctrl(struct nvme_ctrl *ctrl)
 	return ctrl->cntrltype == NVME_CTRL_ADMIN;
 }
 
+static inline bool nvme_is_io_ctrl(struct nvme_ctrl *ctrl)
+{
+	return !nvme_discovery_ctrl(ctrl) && !nvme_admin_ctrl(ctrl);
+}
+
 static bool nvme_validate_cntlid(struct nvme_subsystem *subsys,
 		struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
 {
-- 
2.43.0