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Commit b6d44fe9 authored by Mike Christie's avatar Mike Christie Committed by James Bottomley
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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: default avatarMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent e0726407

drivers/scsi/iscsi_tcp.c

+1 −0
Original line number Diff line number Diff line
@@ -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;

}