From 6bb5e6e772f5f71413e290eb9c6a475e9a6d39e2 Mon Sep 17 00:00:00 2001 From: Akinobu Mita Date: Mon, 2 Jun 2014 22:56:49 +0900 Subject: [PATCH] scsi_debug: allow huge transfer length for read/write commands This change enables to test read/write commands with huge transfer length such as 1GB. For example: # modprobe scsi_debug dev_size_mb=1024 clustering=1 opts=1 # cat /sys/block/$DEV/queue/max_hw_sectors_kb > \ /sys/block/$DEV/queue/max_sectors_kb # fio --name=test --rw=write --bs=1g --size=1g --filename=/dev/$DEV \ --mem=mmaphuge --direct=1 The data type of max_sectors in scsi_host_template has been extended to unsigned int by the previous change. So we can increase it from 0xffff to 0xffffffff to allow such huge transfer length. Also, this increases sg_tablesize and max_segment_size, otherwise the maximum transfer length is limited to 64MB. (sg_tablesize * max_segment_size = 256 * 256KB) Signed-off-by: Akinobu Mita Reviewed-by: Christoph Hellwig Reviewed-by: Martin K. Petersen Acked by: Douglas Gilbert Signed-off-by: Christoph Hellwig --- drivers/scsi/scsi_debug.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 1328a2621070..c4ad52c2ec69 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -2484,7 +2484,7 @@ static int scsi_debug_slave_configure(struct scsi_device *sdp) if (sdp->host->cmd_per_lun) scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING, sdp->host->cmd_per_lun); - blk_queue_max_segment_size(sdp->request_queue, 256 * 1024); + blk_queue_max_segment_size(sdp->request_queue, -1U); if (scsi_debug_no_uld) sdp->no_uld_attach = 1; return 0; @@ -3946,9 +3946,9 @@ static struct scsi_host_template sdebug_driver_template = { .bios_param = scsi_debug_biosparam, .can_queue = SCSI_DEBUG_CANQUEUE, .this_id = 7, - .sg_tablesize = 256, + .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS, .cmd_per_lun = 16, - .max_sectors = 0xffff, + .max_sectors = -1U, .use_clustering = DISABLE_CLUSTERING, .module = THIS_MODULE, }; -- 2.20.1