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

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Message-ID: <85172e19-5344-bc30-e6a4-aa39dba3b50b@intel.com>
Date:   Wed, 15 Feb 2023 17:56:07 +0100
From:   Alexander Lobakin <aleksander.lobakin@...el.com>
To:     Gavin Li <gavinl@...dia.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

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.

>> 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