Re: [PATCH for-rc v3] RDMA/core: Fix ENODEV error for iWARP test over vlan

[Leon Romanovsky <leon@kernel.org>]

On Tue, Oct 08, 2024 at 05:13:34PM +0530, Anumula Murali Mohan Reddy wrote:
> If traffic is over vlan, cma_validate_port() fails to match vlan
> net_device ifindex with bound_if_index and results in ENODEV error.
> It is because rdma_copy_src_l2_addr() always assigns bound_if_index with
> real net_device ifindex.
> This patch fixes the issue by assigning bound_if_index with vlan
> net_device index if traffic is over vlan.
> 
> Fixes: f8ef1be816bf ("RDMA/cma: Avoid GID lookups on iWARP devices")
> Signed-off-by: Anumula Murali Mohan Reddy <anumula@chelsio.com>
> Signed-off-by: Potnuri Bharat Teja <bharat@chelsio.com>
> ---
> Changes since v2:
> Addressed previous review comments
> ---
>  drivers/infiniband/core/addr.c | 2 ++
>  1 file changed, 2 insertions(+)

This patch causes to udaddy regression. It doesn't work over VLANs
anymore.

# Client:
ifconfig eth2 1.1.1.1
ip link add link eth2 name p0.3597 type vlan protocol 802.1Q id 3597
ip link set dev p0.3597 up
ip addr add 2.2.2.2/16 dev p0.3597
udaddy -S 847 -C 220 -c 2 -t 0 -s 2.2.2.3 -b 2.2.2.2

# Server:
ifconfig eth2 1.1.1.3
ip link add link eth2 name p0.3597 type vlan protocol 802.1Q id 3597
ip link set dev p0.3597 up
ip addr add 2.2.2.3/16 dev p0.3597
udaddy -S 847 -C 220 -c 2 -t 0 -b 2.2.2.3

Thanks

> 
> diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
> index be0743dac3ff..c4cf26f1d149 100644
> --- a/drivers/infiniband/core/addr.c
> +++ b/drivers/infiniband/core/addr.c
> @@ -269,6 +269,8 @@ rdma_find_ndev_for_src_ip_rcu(struct net *net, const struct sockaddr *src_in)
>  		break;
>  #endif
>  	}
> +	if (!ret && dev && is_vlan_dev(dev))
> +		dev = vlan_dev_real_dev(dev);
>  	return ret ? ERR_PTR(ret) : dev;
>  }
>  
> -- 
> 2.39.3
>