Hi Greg,
On Sun, Jun 13, 2021 at 03:07:54PM +0200, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
>
> The patch below does not apply to the 5.10-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@xxxxxxxxxxxxxxx>.
Here is the backport.
--
Regards
Sudip
>From 5e9bf770efa4c52953454b983cfdcd5ebc3d003d Mon Sep 17 00:00:00 2001
From: Mark Bloch <mbloch@xxxxxxxxxx>
Date: Mon, 7 Jun 2021 11:03:12 +0300
Subject: [PATCH] RDMA/mlx5: Block FDB rules when not in switchdev mode
commit edc0b0bccc9c80d9a44d3002dcca94984b25e7cf upstream.
Allow creating FDB steering rules only when in switchdev mode.
The only software model where a userspace application can manipulate
FDB entries is when it manages the eswitch. This is only possible in
switchdev mode where we expose a single RDMA device with representors
for all the vports that are connected to the eswitch.
Fixes: 52438be44112 ("RDMA/mlx5: Allow inserting a steering rule to the FDB")
Link: https://lore.kernel.org/r/e928ae7c58d07f104716a2a8d730963d1bd01204.1623052923.git.leonro@xxxxxxxxxx
Reviewed-by: Maor Gottlieb <maorg@xxxxxxxxxx>
Signed-off-by: Mark Bloch <mbloch@xxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
[sudip: use old mlx5_eswitch_mode]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
---
drivers/infiniband/hw/mlx5/fs.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/infiniband/hw/mlx5/fs.c b/drivers/infiniband/hw/mlx5/fs.c
index 13d50b178166..b3391ecedda7 100644
--- a/drivers/infiniband/hw/mlx5/fs.c
+++ b/drivers/infiniband/hw/mlx5/fs.c
@@ -2136,6 +2136,13 @@ static int UVERBS_HANDLER(MLX5_IB_METHOD_FLOW_MATCHER_CREATE)(
if (err)
goto end;
+ if (obj->ns_type == MLX5_FLOW_NAMESPACE_FDB &&
+ mlx5_eswitch_mode(dev->mdev->priv.eswitch) !=
+ MLX5_ESWITCH_OFFLOADS) {
+ err = -EINVAL;
+ goto end;
+ }
+
uobj->object = obj;
obj->mdev = dev->mdev;
atomic_set(&obj->usecnt, 0);
--
2.30.2
