diff mbox series

[06/19] nvme: Introduce NVME_INLINE_PROT_SG_CNT

Message ID 20200224164544.219438-8-maxg@mellanox.com (mailing list archive)
State Superseded
Headers show
Series nvme-rdma/nvmet-rdma: Add metadata/T10-PI support | expand

Commit Message

Max Gurtovoy Feb. 24, 2020, 4:45 p.m. UTC 
From: Israel Rukshin <israelr@mellanox.com>

SGL size of PI metadata is usually small. Thus, 1 inline sg should
cover most cases. The macro will be used for pre-allocate a single SGL
entry for protection information. The preallocation of small inline SGLs
depends on SG_CHAIN capability so if the ARCH doesn't support SG_CHAIN,
use the runtime allocation for the SGL. This patch is a preparation for
adding metadata (T10-PI) over fabric support.

Signed-off-by: Israel Rukshin <israelr@mellanox.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
---
 drivers/nvme/host/nvme.h | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index af8e10a..d0bfa2b 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -30,8 +30,10 @@ 
 
 #ifdef CONFIG_ARCH_NO_SG_CHAIN
 #define  NVME_INLINE_SG_CNT  0
+#define  NVME_INLINE_PROT_SG_CNT  0
 #else
 #define  NVME_INLINE_SG_CNT  2
+#define  NVME_INLINE_PROT_SG_CNT  1
 #endif
 
 extern struct workqueue_struct *nvme_wq;