[PATCH rdma-rc] IB/mlx4: Fix MAD tunneling when SRIOV is enabled

[PATCH rdma-rc] IB/mlx4: Fix MAD tunneling when SRIOV is enabled

[Leon Romanovsky]

From: Jack Morgenstein <jackm-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>

The cited patch added a type field to structures ib_ah and rdma_ah_attr.

Function mlx4_ib_query_ah() builds an rdma_ah_attr structure from the
data in an mlx4_ib_ah structure (which contains both an ib_ah structure
and an address vector).

For mlx4_ib_query_ah() to work properly, the type field in the contained
ib_ah structure must be set correctly.

In the outgoing MAD tunneling flow, procedure mlx4_ib_multiplex_mad()
paravirtualizes a MAD received from a slave and sends the processed
mad out over the wire. During this processing, it populates an
mlx4_ib_ah structure and calls mlx4_ib_query_ah().

The cited commit overlooked setting the type field in the contained
ib_ah structure before invoking mlx4_ib_query_ah(). As a result, the
type field remained uninitialized, and the rdma_ah_attr structure was
incorrectly built. This resulted in improperly built MADs being sent out
over the wire.

This patch properly initializes the type field in the contained ib_ah
structure before calling mlx4_ib_query_ah(). The rdma_ah_attr structure
is then generated correctly.

Fixes: 44c58487d51a ("IB/core: Define 'ib' and 'roce' rdma_ah_attr types")
Signed-off-by: Jack Morgenstein <jackm-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
Signed-off-by: Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/infiniband/hw/mlx4/mad.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/infiniband/hw/mlx4/mad.c b/drivers/infiniband/hw/mlx4/mad.c
index b4694717f6f3..21d31cb1325f 100644
--- a/drivers/infiniband/hw/mlx4/mad.c
+++ b/drivers/infiniband/hw/mlx4/mad.c
@@ -1578,6 +1578,7 @@ static void mlx4_ib_multiplex_mad(struct mlx4_ib_demux_pv_ctx *ctx, struct ib_wc
 	if (port < 0)
 		return;
 	ah.av.ib.port_pd = cpu_to_be32(port << 24 | (be32_to_cpu(ah.av.ib.port_pd) & 0xffffff));
+	ah.ibah.type = rdma_ah_find_type(&dev->ib_dev, port);

 	mlx4_ib_query_ah(&ah.ibah, &ah_attr);
 	if (rdma_ah_get_ah_flags(&ah_attr) & IB_AH_GRH)
--
2.12.2

--
To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH rdma-rc] IB/mlx4: Fix MAD tunneling when SRIOV is enabled

[Doug Ledford]

On Sun, 2017-05-21 at 19:11 +0300, Leon Romanovsky wrote:
> The cited patch added a type field to structures ib_ah and
> rdma_ah_attr.
> 
> Function mlx4_ib_query_ah() builds an rdma_ah_attr structure from the
> data in an mlx4_ib_ah structure (which contains both an ib_ah
> structure
> and an address vector).
> 
> For mlx4_ib_query_ah() to work properly, the type field in the
> contained
> ib_ah structure must be set correctly.
> 
> In the outgoing MAD tunneling flow, procedure mlx4_ib_multiplex_mad()
> paravirtualizes a MAD received from a slave and sends the processed
> mad out over the wire. During this processing, it populates an
> mlx4_ib_ah structure and calls mlx4_ib_query_ah().
> 
> The cited commit overlooked setting the type field in the contained
> ib_ah structure before invoking mlx4_ib_query_ah(). As a result, the
> type field remained uninitialized, and the rdma_ah_attr structure was
> incorrectly built. This resulted in improperly built MADs being sent
> out
> over the wire.
> 
> This patch properly initializes the type field in the contained ib_ah
> structure before calling mlx4_ib_query_ah(). The rdma_ah_attr
> structure
> is then generated correctly.
> 
> Fixes: 44c58487d51a ("IB/core: Define 'ib' and 'roce' rdma_ah_attr
> types")
> Signed-off-by: Jack Morgenstein <jackm-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
> Signed-off-by: Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>

Thanks, applied.

-- 
Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
    GPG KeyID: B826A3330E572FDD
   
Key fingerprint = AE6B 1BDA 122B 23B4 265B  1274 B826 A333 0E57 2FDD

--
To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html