netdev - Re: [PATCH net-next v2 4/8] flow_offload: Reject matching on layer 2 miss

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Date: Mon, 29 May 2023 16:19:18 +0300
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Ido Schimmel <idosch@...dia.com>, netdev@...r.kernel.org,
 bridge@...ts.linux-foundation.org
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
 edumazet@...gle.com, taras.chornyi@...ision.eu, saeedm@...dia.com,
 leon@...nel.org, petrm@...dia.com, vladimir.oltean@....com,
 claudiu.manoil@....com, alexandre.belloni@...tlin.com,
 UNGLinuxDriver@...rochip.com, jhs@...atatu.com, xiyou.wangcong@...il.com,
 jiri@...nulli.us, roopa@...dia.com, simon.horman@...igine.com
Subject: Re: [PATCH net-next v2 4/8] flow_offload: Reject matching on layer 2
 miss

On 29/05/2023 14:48, Ido Schimmel wrote:
> Adjust drivers that support the 'FLOW_DISSECTOR_KEY_META' key to reject
> filters that try to match on the newly added layer 2 miss field. Add an
> extack message to clearly communicate the failure reason to user space.
> 
> The following users were not patched:
> 
> 1. mtk_flow_offload_replace(): Only checks that the key is present, but
>    does not do anything with it.
> 2. mlx5_tc_ct_set_tuple_match(): Used as part of netfilter offload,
>    which does not make use of the new field, unlike tc.
> 3. get_netdev_from_rule() in nfp: Likewise.
> 
> Example:
> 
>  # tc filter add dev swp1 egress pref 1 proto all flower skip_sw l2_miss true action drop
>  Error: mlxsw_spectrum: Can't match on "l2_miss".
>  We have an error talking to the kernel
> 
> Acked-by: Elad Nachman <enachman@...vell.com>
> Signed-off-by: Ido Schimmel <idosch@...dia.com>
> ---
> 
> Notes:
>     v2:
>     * Expand commit message to explain why some users were not patched.
> 
>  .../net/ethernet/marvell/prestera/prestera_flower.c    |  6 ++++++
>  drivers/net/ethernet/mellanox/mlx5/core/en_tc.c        |  6 ++++++
>  drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c  |  6 ++++++
>  drivers/net/ethernet/mscc/ocelot_flower.c              | 10 ++++++++++
>  4 files changed, 28 insertions(+)
> 

Reviewed-by: Nikolay Aleksandrov <razor@...ckwall.org>