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scsi: introduce a max_segment_size host_template parameters

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This allows the host driver to indicate the maximum supported
segment size in a nice an easy way, so that the driver doesn't
have to worry about DMA-layer imposed limitations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig 2018-12-13 16:17:03 +01:00 • committed by Martin K. Petersen
parent 2a3d4eb8e2
commit 50c2e9107f
5 changed files with 15 additions and 9 deletions
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2
drivers/scsi/scsi_debug.c
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@ -3973,7 +3973,6 @@ static int scsi_debug_slave_configure(struct scsi_device *sdp)
return 1; /* no resources, will be marked offline */
}
sdp->hostdata = devip;
blk_queue_max_segment_size(sdp->request_queue, -1U);
if (sdebug_no_uld)
sdp->no_uld_attach = 1;
config_cdb_len(sdp);
@ -5851,6 +5850,7 @@ static struct scsi_host_template sdebug_driver_template = {
.sg_tablesize = SG_MAX_SEGMENTS,
.cmd_per_lun = DEF_CMD_PER_LUN,
.max_sectors = -1U,
.max_segment_size = -1U,
.module = THIS_MODULE,
.track_queue_depth = 1,
};