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[SCSI] iscsi_tcp: Turn off bounce buffers 

It was found by LSI that on setups with large amounts of memory
we were bouncing buffers when we did not need to. If the iscsi tcp
code touches the data buffer (or a helper does),
it will kmap the buffer. iscsi_tcp also does not interact with hardware,
so it does not have any hw dma restrictions. This patch sets the bounce
buffer settings for our device queue so buffers should not be bounced
because of a driver limit.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Mike Christie 2007-07-26 12:46:47 -05:00 committed by James Bottomley
parent e07264071f
commit b6d44fe958
1 changed files with 1 additions and 0 deletions
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drivers/scsi/iscsi_tcp.c
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@ -2216,6 +2216,7 @@ static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
static int iscsi_tcp_slave_configure(struct scsi_device *sdev)
{
blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
blk_queue_dma_alignment(sdev->request_queue, 0);
return 0;
}