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scsi: fill BLOCK LIMITS VPD page filed with suitable value

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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: Changpeng Liu <changpeng.liu@intel.com>
This commit is contained in:
Changpeng Liu 2016-08-10 15:17:47 +08:00 committed by Daniel Verkamp
parent bd2a3a0998
commit 17dbcf58c1
1 changed files with 15 additions and 25 deletions
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40
lib/scsi/scsi_bdev.c
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@ -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;
@ -524,33 +524,23 @@ 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 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 = 1;
}
/* OPTIMAL TRANSFER LENGTH GRANULARITY */
to_be16(&data[6], optimal_blocks);
blocks = SPDK_WORK_BLOCK_SIZE / bdev->blocklen;
/* MAXIMUM TRANSFER LENGTH */
to_be32(&data[8], blocks);
/* OPTIMAL TRANSFER LENGTH */
to_be32(&data[12], blocks);
/* MAXIMUM PREFETCH XDREAD XDWRITE TRANSFER LENGTH */
len = 20 - hlen;
if (bdev->thin_provisioning) {