netdev - Re: [PATCH RFC mlx5-next 0/1] net/mlx5e: Expose physical received bits counters to ethtool

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Message-ID: <e22a37a6-d15c-4abe-becd-4c538d99ad30@gmail.com>
Date: Tue, 13 Jan 2026 08:43:42 +0200
From: Tariq Toukan <ttoukan.linux@...il.com>
To: Kenta Akagi <k@...l.me>, Saeed Mahameed <saeedm@...dia.com>,
 Tariq Toukan <tariqt@...dia.com>, Mark Bloch <mbloch@...dia.com>,
 Leon Romanovsky <leon@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC mlx5-next 0/1] net/mlx5e: Expose physical received
 bits counters to ethtool

On 13/01/2026 8:31, Tariq Toukan wrote:
> 
> 
> On 12/01/2026 9:03, Kenta Akagi wrote:
>> Hi,
>>
>> I would like to measure the cable BER on ConnectX.
>>
>> According to the documentation[1][2], there are counters that can be used
>> for this purpose: rx_corrected_bits_phy, rx_pcs_symbol_err_phy and
>> rx_bits_phy. However, rx_bits_phy does not show up in ethtool
>> statistics.
>>
>> This patch exposes the PPCNT phy_received_bits as rx_bits_phy.
>>
>>
>> On a ConnectX-5 with 25Gbase connection, it works as expected.
>>
>> On the other hand, although I have not verified it, in an 800Gbps
>> environment rx_bits_phy would likely overflow after about 124 days.
>> Since I cannot judge whether this is acceptable, I am posting this as an
>> RFC first.
>>
> 
> Hi,
> 
> This is a 64-bits counter so no overflow is expected.
> 

Sorry, ignore my comment, your numbers make sense.
Maybe it's ~248 days, but same idea.

>>
>> [1] commit 8ce3b586faa4 ("net/mlx5: Add counter information to mlx5
>>      driver documentation")
>> [2] https://docs.kernel.org/networking/device_drivers/ethernet/ 
>> mellanox/mlx5/counters.html
>>
>> Kenta Akagi (1):
>>    net/mlx5e: Expose physical received bits counters to ethtool
>>
>>   drivers/net/ethernet/mellanox/mlx5/core/en_stats.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>