NVMe: Simplify Firmware Activate code slightly

Add definitions for the three Firmware Activate actions, and change the
SCSI translation code to construct the command into a temporary variable
instead of translating the endianness back-and-forth.
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Reviewed-by: Vishal Verma <vishal.l.verma@linux.intel.com>

drivers/block/nvme-scsi.c

@@ -1577,10 +1577,8 @@ static int nvme_trans_send_fw_cmd(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 		c.dlfw.numd = cpu_to_le32((tot_len/BYTES_TO_DWORDS) - 1);
 		c.dlfw.offset = cpu_to_le32(offset/BYTES_TO_DWORDS);
 	} else if (opcode == nvme_admin_activate_fw) {
-		c.common.cdw10[0] = cpu_to_le32(buffer_id);
-		/* AA=01b Replace & activate at reset */
-		c.common.cdw10[0] = cpu_to_le32(le32_to_cpu(
-						c.common.cdw10[0]) | 0x00000008);
+		u32 cdw10 = buffer_id | NVME_FWACT_REPL_ACTV;
+		c.common.cdw10[0] = cpu_to_le32(cdw10);
 	}
 
 	nvme_sc = nvme_submit_admin_cmd(dev, &c, NULL);

include/linux/nvme.h

@@ -316,6 +316,9 @@ enum {
 	NVME_FEAT_WRITE_ATOMIC	= 0x0a,
 	NVME_FEAT_ASYNC_EVENT	= 0x0b,
 	NVME_FEAT_SW_PROGRESS	= 0x0c,
+	NVME_FWACT_REPL		= (0 << 3),
+	NVME_FWACT_REPL_ACTV	= (1 << 3),
+	NVME_FWACT_ACTV		= (2 << 3),
 };
 
 struct nvme_identify {