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

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Date:   Mon, 20 Feb 2023 19:31:50 +0800
From:   Gavin Li <gavinl@...dia.com>
To:     Alexander Lobakin <aleksander.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 2/16/2023 12:56 AM, Alexander Lobakin wrote:
> External email: Use caution opening links or attachments
>
>
> From: Gavin Li <gavinl@...dia.com>
> Date: Wed, 15 Feb 2023 10:54:12 +0800
>
>> 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
> [...]
>
>>>> +     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".
> Nah, I mean the following. Your code:
>
>          return a_info->options_len == b_info->options_len &&
>                  memcmp(a_info + 1, b_info + 1, ...
>
> should be:
>
>          return a_info->options_len == b_info->options_len &&
>                 memcmp(a_info + 1, b_info + 1, ...
>
> 7 spaces instead of a tab to have it aligned to the prev line.
ACK
>
>>> 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
> Thanks,
> Olek