nvme: fix status magic numbers

Replaced some magic numbers about SC and SCT with enum and macro.
Signed-off-by: Weiwen Hu <huweiwen@linux.alibaba.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>

drivers/nvme/host/constants.c

@@ -173,7 +173,7 @@ static const char * const nvme_statuses[] = {
 
 const char *nvme_get_error_status_str(u16 status)
 {
-	status &= 0x7ff;
+	status &= NVME_SCT_SC_MASK;
 	if (status < ARRAY_SIZE(nvme_statuses) && nvme_statuses[status])
 		return nvme_statuses[status];
 	return "Unknown";

drivers/nvme/host/core.c

@@ -261,7 +261,7 @@ void nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl)
 
 static blk_status_t nvme_error_status(u16 status)
 {
-	switch (status & 0x7ff) {
+	switch (status & NVME_SCT_SC_MASK) {
 	case NVME_SC_SUCCESS:
 		return BLK_STS_OK;
 	case NVME_SC_CAP_EXCEEDED:
@@ -329,8 +329,8 @@ static void nvme_log_error(struct request *req)
 		       nvme_sect_to_lba(ns->head, blk_rq_pos(req)),
 		       blk_rq_bytes(req) >> ns->head->lba_shift,
 		       nvme_get_error_status_str(nr->status),
-		       nr->status >> 8 & 7,	/* Status Code Type */
-		       nr->status & 0xff,	/* Status Code */
+		       NVME_SCT(nr->status),		/* Status Code Type */
+		       nr->status & NVME_SC_MASK,	/* Status Code */
 		       nr->status & NVME_SC_MORE ? "MORE " : "",
 		       nr->status & NVME_SC_DNR  ? "DNR "  : "");
 		return;
@@ -341,8 +341,8 @@ static void nvme_log_error(struct request *req)
 			   nvme_get_admin_opcode_str(nr->cmd->common.opcode),
 			   nr->cmd->common.opcode,
 			   nvme_get_error_status_str(nr->status),
-			   nr->status >> 8 & 7,	/* Status Code Type */
-			   nr->status & 0xff,	/* Status Code */
+			   NVME_SCT(nr->status),	/* Status Code Type */
+			   nr->status & NVME_SC_MASK,	/* Status Code */
 			   nr->status & NVME_SC_MORE ? "MORE " : "",
 			   nr->status & NVME_SC_DNR  ? "DNR "  : "");
 }
@@ -359,8 +359,8 @@ static void nvme_log_err_passthru(struct request *req)
 		     nvme_get_admin_opcode_str(nr->cmd->common.opcode),
 		nr->cmd->common.opcode,
 		nvme_get_error_status_str(nr->status),
-		nr->status >> 8 & 7,	/* Status Code Type */
-		nr->status & 0xff,	/* Status Code */
+		NVME_SCT(nr->status),		/* Status Code Type */
+		nr->status & NVME_SC_MASK,	/* Status Code */
 		nr->status & NVME_SC_MORE ? "MORE " : "",
 		nr->status & NVME_SC_DNR  ? "DNR "  : "",
 		nr->cmd->common.cdw10,
@@ -388,7 +388,7 @@ static inline enum nvme_disposition nvme_decide_disposition(struct request *req)
 	    nvme_req(req)->retries >= nvme_max_retries)
 		return COMPLETE;
 
-	if ((nvme_req(req)->status & 0x7ff) == NVME_SC_AUTH_REQUIRED)
+	if ((nvme_req(req)->status & NVME_SCT_SC_MASK) == NVME_SC_AUTH_REQUIRED)
 		return AUTHENTICATE;
 
 	if (req->cmd_flags & REQ_NVME_MPATH) {
@@ -1256,7 +1256,7 @@ EXPORT_SYMBOL_NS_GPL(nvme_passthru_end, NVME_TARGET_PASSTHRU);
 
 /*
  * Recommended frequency for KATO commands per NVMe 1.4 section 7.12.1:
- * 
+ *
  *   The host should send Keep Alive commands at half of the Keep Alive Timeout
  *   accounting for transport roundtrip times [..].
  */

drivers/nvme/host/multipath.c

@@ -83,7 +83,7 @@ void nvme_mpath_start_freeze(struct nvme_subsystem *subsys)
 void nvme_failover_req(struct request *req)
 {
 	struct nvme_ns *ns = req->q->queuedata;
-	u16 status = nvme_req(req)->status & 0x7ff;
+	u16 status = nvme_req(req)->status & NVME_SCT_SC_MASK;
 	unsigned long flags;
 	struct bio *bio;
 

drivers/nvme/host/nvme.h

@@ -689,7 +689,7 @@ static inline u32 nvme_bytes_to_numd(size_t len)
 
 static inline bool nvme_is_ana_error(u16 status)
 {
-	switch (status & 0x7ff) {
+	switch (status & NVME_SCT_SC_MASK) {
 	case NVME_SC_ANA_TRANSITION:
 	case NVME_SC_ANA_INACCESSIBLE:
 	case NVME_SC_ANA_PERSISTENT_LOSS:
@@ -702,7 +702,7 @@ static inline bool nvme_is_ana_error(u16 status)
 static inline bool nvme_is_path_error(u16 status)
 {
 	/* check for a status code type of 'path related status' */
-	return (status & 0x700) == 0x300;
+	return (status & NVME_SCT_MASK) == NVME_SCT_PATH;
 }
 
 /*

drivers/nvme/host/pr.c

@@ -77,7 +77,7 @@ static int nvme_status_to_pr_err(int status)
 	if (nvme_is_path_error(status))
 		return PR_STS_PATH_FAILED;
 
-	switch (status & 0x7ff) {
+	switch (status & NVME_SCT_SC_MASK) {
 	case NVME_SC_SUCCESS:
 		return PR_STS_SUCCESS;
 	case NVME_SC_RESERVATION_CONFLICT:

include/linux/nvme.h

@@ -1846,6 +1846,7 @@ enum {
 	/*
 	 * Generic Command Status:
 	 */
+	NVME_SCT_GENERIC		= 0x0,
 	NVME_SC_SUCCESS			= 0x0,
 	NVME_SC_INVALID_OPCODE		= 0x1,
 	NVME_SC_INVALID_FIELD		= 0x2,
@@ -1893,6 +1894,7 @@ enum {
 	/*
 	 * Command Specific Status:
 	 */
+	NVME_SCT_COMMAND_SPECIFIC	= 0x100,
 	NVME_SC_CQ_INVALID		= 0x100,
 	NVME_SC_QID_INVALID		= 0x101,
 	NVME_SC_QUEUE_SIZE		= 0x102,
@@ -1966,6 +1968,7 @@ enum {
 	/*
 	 * Media and Data Integrity Errors:
 	 */
+	NVME_SCT_MEDIA_ERROR		= 0x200,
 	NVME_SC_WRITE_FAULT		= 0x280,
 	NVME_SC_READ_ERROR		= 0x281,
 	NVME_SC_GUARD_CHECK		= 0x282,
@@ -1978,6 +1981,7 @@ enum {
 	/*
 	 * Path-related Errors:
 	 */
+	NVME_SCT_PATH			= 0x300,
 	NVME_SC_INTERNAL_PATH_ERROR	= 0x300,
 	NVME_SC_ANA_PERSISTENT_LOSS	= 0x301,
 	NVME_SC_ANA_INACCESSIBLE	= 0x302,
@@ -1986,11 +1990,17 @@ enum {
 	NVME_SC_HOST_PATH_ERROR		= 0x370,
 	NVME_SC_HOST_ABORTED_CMD	= 0x371,
 
-	NVME_SC_CRD			= 0x1800,
+	NVME_SC_MASK			= 0x00ff, /* Status Code */
+	NVME_SCT_MASK			= 0x0700, /* Status Code Type */
+	NVME_SCT_SC_MASK		= NVME_SCT_MASK | NVME_SC_MASK,
+
+	NVME_SC_CRD			= 0x1800, /* Command Retry Delayed */
 	NVME_SC_MORE			= 0x2000,
-	NVME_SC_DNR			= 0x4000,
+	NVME_SC_DNR			= 0x4000, /* Do Not Retry */
 };
 
+#define NVME_SCT(status) ((status) >> 8 & 7)
+
 struct nvme_completion {
 	/*
 	 * Used by Admin and Fabrics commands to return data: