[PATCH 1/3] iscsi iser: remove DMA restrictions

[Pete Wyckoff <pw@osc.edu>]

iscsi_iser does not have any hardware DMA restrictions.  Add a
slave_configure function to remove any DMA alignment restriction,
allowing the use of direct IO from arbitrary offsets within a page.
Also disable page bouncing; iser has no restrictions on which pages it
can address.

Signed-off-by: Pete Wyckoff <pw@osc.edu>
---
 drivers/infiniband/ulp/iser/iscsi_iser.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index be1b9fb..1b272a6 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -543,6 +543,13 @@ iscsi_iser_ep_disconnect(__u64 ep_handle)
 	iser_conn_terminate(ib_conn);
 }
 
+static int iscsi_iser_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;
+}
+
 static struct scsi_host_template iscsi_iser_sht = {
 	.module                 = THIS_MODULE,
 	.name                   = "iSCSI Initiator over iSER, v." DRV_VER,
@@ -556,6 +563,7 @@ static struct scsi_host_template iscsi_iser_sht = {
 	.eh_device_reset_handler= iscsi_eh_device_reset,
 	.eh_host_reset_handler	= iscsi_eh_host_reset,
 	.use_clustering         = DISABLE_CLUSTERING,
+	.slave_configure	= iscsi_iser_slave_configure,
 	.proc_name              = "iscsi_iser",
 	.this_id                = -1,
 };
-- 
1.5.3.8