netdev - Re: [PATCH net-next v1 2/3] net/mlx5e: Add helper for encap_info

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Date:   Wed, 15 Feb 2023 10:54:12 +0800
From:   Gavin Li <gavinl@...dia.com>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, roopa@...dia.com,
        eng.alaamohamedsoliman.am@...il.com, bigeasy@...utronix.de,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Roi Dayan <roid@...dia.com>, Maor Dickman <maord@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: Re: [PATCH net-next v1 2/3] net/mlx5e: Add helper for
 encap_info_equal for tunnels with options


On 2/14/2023 11:01 PM, Alexander Lobakin wrote:
> External email: Use caution opening links or attachments
>
>
> From: Gavin Li <gavinl@...dia.com>
> Date: Tue, 14 Feb 2023 15:41:36 +0200
>
> (dropping non-existent nikolay@...dia.com)
>
>> For tunnels with options, eg, geneve and vxlan with gbp, they share the
>> same way to compare the headers and options. Extract the code as a common
>> function for them
>>
>> Change-Id: I3ea697293c8d5d66c0c20080dbde88f60bcbd62f
>> Signed-off-by: Gavin Li <gavinl@...dia.com>
>> Reviewed-by: Roi Dayan <roid@...dia.com>
>> Reviewed-by: Maor Dickman <maord@...dia.com>
>> Acked-by: Saeed Mahameed <saeedm@...dia.com>
> [...]
>
>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
>> index 780224fd67a1..4df9d27a63ad 100644
>> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
>> @@ -571,6 +571,35 @@ bool mlx5e_tc_tun_encap_info_equal_generic(struct mlx5e_encap_key *a,
>>                a->tc_tunnel->tunnel_type == b->tc_tunnel->tunnel_type;
>>   }
>>
>> +bool mlx5e_tc_tun_encap_info_equal_options(struct mlx5e_encap_key *a,
>> +                                        struct mlx5e_encap_key *b,
>> +                                        __be16 tun_flags)
>> +{
>> +     struct ip_tunnel_info *a_info;
>> +     struct ip_tunnel_info *b_info;
>> +     bool a_has_opts, b_has_opts;
>> +
>> +     if (!mlx5e_tc_tun_encap_info_equal_generic(a, b))
>> +             return false;
>> +
>> +     a_has_opts = !!(a->ip_tun_key->tun_flags & tun_flags);
>> +     b_has_opts = !!(b->ip_tun_key->tun_flags & tun_flags);
>> +
>> +     /* keys are equal when both don't have any options attached */
>> +     if (!a_has_opts && !b_has_opts)
>> +             return true;
>> +
>> +     if (a_has_opts != b_has_opts)
>> +             return false;
>> +
>> +     /* options stored in memory next to ip_tunnel_info struct */
>> +     a_info = container_of(a->ip_tun_key, struct ip_tunnel_info, key);
>> +     b_info = container_of(b->ip_tun_key, struct ip_tunnel_info, key);
>> +
>> +     return a_info->options_len == b_info->options_len &&
>> +             memcmp(a_info + 1, b_info + 1, a_info->options_len) == 0;
> 1. memcmp() is not aligned to the first expr (off-by-one to the right).
Options start from "info + 1", see ip_tunnel_info_opts and will use it 
here to replace the "info+1".
> 2. `!expr` is preferred over `expr == 0`.
ACK
>
>> +}
>> +
>>   static int cmp_decap_info(struct mlx5e_decap_key *a,
>>                          struct mlx5e_decap_key *b)
>>   {
> [...]
>
> Thanks,
> Olek