netdev - Re: [PATCH net] net/mlx5: Not returning mlx5_link

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Message-ID: <25e5b405-09bf-40ac-8f45-5f3a0bbed8f5@gmail.com>
Date: Mon, 8 Sep 2025 15:43:25 +0300
From: Tariq Toukan <ttoukan.linux@...il.com>
To: Vitaly Kuznetsov <vkuznets@...hat.com>, Li Tian <litian@...hat.com>,
 netdev@...r.kernel.org, linux-hyperv@...r.kernel.org
Cc: Saeed Mahameed <saeedm@...dia.com>, Tariq Toukan <tariqt@...dia.com>,
 Mark Bloch <mbloch@...dia.com>, Leon Romanovsky <leon@...nel.org>,
 Haiyang Zhang <haiyangz@...rosoft.com>,
 Benjamin Poirier <bpoirier@...hat.com>, Carolina Jubran
 <cjubran@...dia.com>, Shahar Shitrit <shshitrit@...dia.com>
Subject: Re: [PATCH net] net/mlx5: Not returning mlx5_link_info table when
 speed is unknown



On 08/09/2025 12:58, Vitaly Kuznetsov wrote:
> Li Tian <litian@...hat.com> writes:
> 
>> Because mlx5e_link_mode is sparse e.g. Azure mlx5 reports PTYS 19.
>> Do not return it when speed unless retrieved successfully.
>>
>> Fixes: 65a5d35571849 ("net/mlx5: Refactor link speed handling with mlx5_link_info struct")

++

Adding author and reviewer of offending patch.

>> Suggested-by: Vitaly Kuznetsov <vkuznets@...hat.com>
>> Signed-off-by: Li Tian <litian@...hat.com>
>> ---
>>   drivers/net/ethernet/mellanox/mlx5/core/port.c | 6 +++++-
>>   1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/port.c b/drivers/net/ethernet/mellanox/mlx5/core/port.c
>> index 2d7adf7444ba..a69c83da2542 100644
>> --- a/drivers/net/ethernet/mellanox/mlx5/core/port.c
>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/port.c
>> @@ -1170,7 +1170,11 @@ const struct mlx5_link_info *mlx5_port_ptys2info(struct mlx5_core_dev *mdev,
>>   	mlx5e_port_get_link_mode_info_arr(mdev, &table, &max_size,
>>   					  force_legacy);
>>   	i = find_first_bit(&temp, max_size);
>> -	if (i < max_size)

Keep an empty line before comment.

>> +	/*

Can have the comment text starting from the first line.
>> +	 * mlx5e_link_mode is sparse. Check speed
> 
> The array is either 'mlx5e_link_mode' or 'mlx5e_ext_link_info' but both
> have holes in them.
> 

You mean 'mlx5e_link_info' and 'mlx5e_ext_link_info'.
I wouldn't say they are sparse. They have holes indeed.


>> +	 * is non-zero as indication of a hole.
>> +	 */
>> +	if (i < max_size && table[i].speed)
>>   		return &table[i];
>>   
>>   	return NULL;
>