nvme.h: add NVM command set SQE/CQE size defines

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 9925b85246d826eecf7426e1158fee71cc85a092..9807d98ca93a8042333d56f2b3312f755b906c5e 100644 (file)
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -50,6 +50,13 @@ enum {
 #define NVME_CMB_CQS(cmbsz)    ((cmbsz) & 0x2)
 #define NVME_CMB_SQS(cmbsz)    ((cmbsz) & 0x1)
 
+/*
+ * Submission and Completion Queue Entry Sizes for the NVM command set.
+ * (In bytes and specified as a power of two (2^n)).
+ */
+#define NVME_NVM_IOSQES                6
+#define NVME_NVM_IOCQES                4
+
 enum {
        NVME_CC_ENABLE          = 1 << 0,
        NVME_CC_CSS_NVM         = 0 << 4,
@@ -61,8 +68,8 @@ enum {
        NVME_CC_SHN_NORMAL      = 1 << 14,
        NVME_CC_SHN_ABRUPT      = 2 << 14,
        NVME_CC_SHN_MASK        = 3 << 14,
-       NVME_CC_IOSQES          = 6 << 16,
-       NVME_CC_IOCQES          = 4 << 20,
+       NVME_CC_IOSQES          = NVME_NVM_IOSQES << 16,
+       NVME_CC_IOCQES          = NVME_NVM_IOCQES << 20,
        NVME_CSTS_RDY           = 1 << 0,
        NVME_CSTS_CFS           = 1 << 1,
        NVME_CSTS_NSSRO         = 1 << 4,