Commit 17dbcf58 authored by Changpeng Liu's avatar Changpeng Liu Committed by Daniel Verkamp
Browse files

scsi: fill BLOCK LIMITS VPD page filed with suitable value 



Linux block layer driver will use the maximum transfer length field to
split IOs larger than this value. We should set the field according to
iSCSI target limitation.

Change-Id: I03ee35bb96f0949418bb976a6c8013f88622a324
Signed-off-by: default avatarChangpeng Liu <changpeng.liu@intel.com>
parent bd2a3a09

lib/scsi/scsi_bdev.c

+12 −22
Original line number Diff line number Diff line
@@ -160,7 +160,7 @@ spdk_bdev_scsi_inquiry(struct spdk_bdev *bdev, struct spdk_scsi_task *task, 
	struct spdk_scsi_lun	*lun;

	struct spdk_scsi_dev	*dev;

	struct spdk_scsi_port	*port;

	uint32_t blocks;

	uint32_t blocks, optimal_blocks;

	int hlen = 0, plen, plen2;

	uint16_t len = 0;

	int pc;
@@ -524,32 +524,22 @@ spdk_bdev_scsi_inquiry(struct spdk_bdev *bdev, struct spdk_scsi_task *task, 


			/* force align to 4KB */

			if (bdev->blocklen < 4096) {

				blocks = 4096 / bdev->blocklen;

				/* OPTIMAL TRANSFER LENGTH GRANULARITY */

				to_be16(&data[6], blocks);



				/* MAXIMUM TRANSFER LENGTH */



				/* OPTIMAL TRANSFER LENGTH */

				blocks = SPDK_WORK_BLOCK_SIZE / bdev->blocklen;



				to_be32(&data[12], blocks);



				/* MAXIMUM PREFETCH XDREAD XDWRITE TRANSFER LENGTH */

				optimal_blocks = 4096 / bdev->blocklen;

			} else {

				blocks = 1;

				optimal_blocks = 1;

			}



			/* OPTIMAL TRANSFER LENGTH GRANULARITY */

				to_be16(&data[6], blocks);

			to_be16(&data[6], optimal_blocks);



				/* MAXIMUM TRANSFER LENGTH */

			blocks = SPDK_WORK_BLOCK_SIZE / bdev->blocklen;



			/* MAXIMUM TRANSFER LENGTH */

			to_be32(&data[8], blocks);

			/* OPTIMAL TRANSFER LENGTH */

				blocks = SPDK_WORK_BLOCK_SIZE / bdev->blocklen;

			to_be32(&data[12], blocks);



			/* MAXIMUM PREFETCH XDREAD XDWRITE TRANSFER LENGTH */

			}



			len = 20 - hlen;