[PATCH] IB/iser: explicitly set shost max_segment_size

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if the lld does not explicitly sets this, scsi takes BLK_MAX_SEGMENT_SIZE
and sets it using dma_set_max_seg_size(). In our case, this will affect
all the rdma device consumers.

Fix it by setting shost max_segment_size according to the device
capability.

Reported-by: Jason Gunthorpe <jgg@xxxxxxxx>
Signed-off-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
---
This goes on top of hch patchset:
"properly communicate queue limits to the DMA layer"

Normally this should go through the rdma tree, so we can
either get it through jens with hch patchset. Alternatively
this is a fix that should go to rc anyways?

 drivers/infiniband/ulp/iser/iscsi_iser.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index 56848232eb81..2984a366dd7d 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -653,6 +653,7 @@ iscsi_iser_session_create(struct iscsi_endpoint *ep,
 						   SHOST_DIX_GUARD_CRC);
 		}
 
+		shost->max_segment_size = ib_dma_max_seg_size(ib_dev);
 		if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG))
 			shost->virt_boundary_mask = ~MASK_4K;
 
-- 
2.17.1




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