[PATCH V4 1/6] nvme-core: add req init helpers

[Chaitanya Kulkarni]

This is a preparation patch which adds a helper that we use in the next
patch that splits the nvme_alloc_request() into
nvme_alloc_request_qid_any() and nvme_alloc_request_qid().

The new functions shares the code to initialize the allocated request
from NVMe cmd, initializing the REQ_OP_XXX from nvme command and setting
the default timeout after request allocation.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>
Reviewed-by: Logan Gunthorpe <logang at deltatee.com>
---
 drivers/nvme/host/core.c | 33 ++++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 98bea150e5dc..315ea958d1b7 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -518,10 +518,31 @@ static inline void nvme_clear_nvme_request(struct request *req)
 	}
 }
 
+static inline void nvme_init_req_from_cmd(struct request *req,
+		struct nvme_command *cmd)
+{
+	req->cmd_flags |= REQ_FAILFAST_DRIVER;
+	nvme_clear_nvme_request(req);
+	nvme_req(req)->cmd = cmd;
+}
+
+static inline unsigned int nvme_req_op(struct nvme_command *cmd)
+{
+	return nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN;
+}
+
+static inline void nvme_init_req_default_timeout(struct request *req)
+{
+	if (req->q->queuedata)
+		req->timeout = NVME_IO_TIMEOUT;
+	else /* no queuedata implies admin queue */
+		req->timeout = NVME_ADMIN_TIMEOUT;
+}
+
 struct request *nvme_alloc_request(struct request_queue *q,
 		struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid)
 {
-	unsigned op = nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN;
+	unsigned op = nvme_req_op(cmd);
 	struct request *req;
 
 	if (qid == NVME_QID_ANY) {
@@ -533,14 +554,8 @@ struct request *nvme_alloc_request(struct request_queue *q,
 	if (IS_ERR(req))
 		return req;
 
-	if (req->q->queuedata)
-		req->timeout = NVME_IO_TIMEOUT;
-	else /* no queuedata implies admin queue */
-		req->timeout = NVME_ADMIN_TIMEOUT;
-
-	req->cmd_flags |= REQ_FAILFAST_DRIVER;
-	nvme_clear_nvme_request(req);
-	nvme_req(req)->cmd = cmd;
+	nvme_init_req_timeout(req);
+	nvme_init_req_from_cmd(req, cmd);
 
 	return req;
 }
-- 
2.22.1