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net/mlx5: E-Switch, Initialize MAC Address for Default GID

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Initialize the source MAC address when creating the default GID entry.
Since this entry is used only for loopback traffic, it only needs to
be a unicast address. A zeroed-out MAC address is sufficient for this
purpose.
Without this fix, random bits would be assigned as the source address.
If these bits formed a multicast address, the firmware would return an
error, preventing the user from switching to switchdev mode:

Error: mlx5_core: Failed setting eswitch to offloads.
kernel answers: Invalid argument

Fixes: 80f09dfc23 ("net/mlx5: Eswitch, enable RoCE loopback traffic")
Signed-off-by: Maor Gottlieb <maorg@nvidia.com>
Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Link: https://patch.msgid.link/20250423083611.324567-3-mbloch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Maor Gottlieb 2025-04-23 11:36:08 +03:00 committed by Jakub Kicinski
parent eacc77a732
commit 5d1a04f347
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/mellanox/mlx5/core/rdma.c
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@ -118,8 +118,8 @@ static void mlx5_rdma_make_default_gid(struct mlx5_core_dev *dev, union ib_gid *
static int mlx5_rdma_add_roce_addr(struct mlx5_core_dev *dev)
{
u8 mac[ETH_ALEN] = {};
union ib_gid gid;
u8 mac[ETH_ALEN];
mlx5_rdma_make_default_gid(dev, &gid);
return mlx5_core_roce_gid_set(dev, 0,