Commit ba7ca2ae authored May 19, 2020 by Israel Rukshin Committed by Christoph Hellwig May 27, 2020

nvme: introduce NVME_INLINE_METADATA_SG_CNT



SGL size of 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 metadata. 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>
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

parent 33cfdc2a

drivers/nvme/host/nvme.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -31,8 +31,10 @@ extern unsigned int admin_timeout;

		#ifdef CONFIG_ARCH_NO_SG_CHAIN
		#define NVME_INLINE_SG_CNT 0
		#define NVME_INLINE_METADATA_SG_CNT 0
		#else
		#define NVME_INLINE_SG_CNT 2
		#define NVME_INLINE_METADATA_SG_CNT 1
		#endif

		extern struct workqueue_struct *nvme_wq;

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