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

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Message-ID: <20260112070324.38819-1-k@mgml.me>
Date: Mon, 12 Jan 2026 16:03:23 +0900
From: Kenta Akagi <k@...l.me>
To: 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, Kenta Akagi <k@...l.me>
Subject: [PATCH RFC mlx5-next 0/1] net/mlx5e: Expose physical received bits counters to ethtool

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.

[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(+)

-- 
2.50.1