[PATCH 1/5] nvmet: add a helper function for cqid checking

[Wilfred Mallawa <wilfred.opensource@gmail.com>]

From: Wilfred Mallawa <wilfred.mallawa@wdc.com>

This patch adds a new helper function nvmet_check_io_cqid(). It is to be
used when parsing host commands for IO CQ creation/deletion and IO SQ
creation to ensure that the specified IO completion queue identifier
(CQID) is not 0 (Admin queue ID). This is a check that already occurs in
the nvmet_execute_x() functions prior to nvmet_check_cqid.

With the addition of this helper function, the CQ ID checks in the
nvmet_execute_x() function can be removed, and instead simply call
nvmet_check_io_cqid() in place of nvmet_check_cqid().

Signed-off-by: Wilfred Mallawa <wilfred.mallawa@wdc.com>
---
 drivers/nvme/target/admin-cmd.c | 14 ++------------
 drivers/nvme/target/core.c      |  7 +++++++
 drivers/nvme/target/nvmet.h     |  1 +
 3 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index acc138bbf8f2..753166fbb133 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -96,12 +96,7 @@ static void nvmet_execute_delete_cq(struct nvmet_req *req)
 		goto complete;
 	}
 
-	if (!cqid) {
-		status = NVME_SC_QID_INVALID | NVME_STATUS_DNR;
-		goto complete;
-	}
-
-	status = nvmet_check_cqid(ctrl, cqid);
+	status = nvmet_check_io_cqid(ctrl, cqid);
 	if (status != NVME_SC_SUCCESS)
 		goto complete;
 
@@ -127,12 +122,7 @@ static void nvmet_execute_create_cq(struct nvmet_req *req)
 		goto complete;
 	}
 
-	if (!cqid) {
-		status = NVME_SC_QID_INVALID | NVME_STATUS_DNR;
-		goto complete;
-	}
-
-	status = nvmet_check_cqid(ctrl, cqid);
+	status = nvmet_check_io_cqid(ctrl, cqid);
 	if (status != NVME_SC_SUCCESS)
 		goto complete;
 
diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index 71f8d06998d6..4c0643a72f66 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -856,6 +856,13 @@ u16 nvmet_check_cqid(struct nvmet_ctrl *ctrl, u16 cqid)
 	return NVME_SC_SUCCESS;
 }
 
+u16 nvmet_check_io_cqid(struct nvmet_ctrl *ctrl, u16 cqid)
+{
+	if (!cqid)
+		return NVME_SC_QID_INVALID | NVME_STATUS_DNR;
+	return nvmet_check_cqid(ctrl, cqid);
+}
+
 u16 nvmet_cq_create(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq,
 		    u16 qid, u16 size)
 {
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index b6db8b74dc4a..2f70db1284c9 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -572,6 +572,7 @@ void nvmet_execute_get_features(struct nvmet_req *req);
 void nvmet_execute_keep_alive(struct nvmet_req *req);
 
 u16 nvmet_check_cqid(struct nvmet_ctrl *ctrl, u16 cqid);
+u16 nvmet_check_io_cqid(struct nvmet_ctrl *ctrl, u16 cqid);
 void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid,
 		u16 size);
 u16 nvmet_cq_create(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid,
-- 
2.49.0