From: Jakub Kicinski <kuba@kernel.org>
To: Carolina Jubran <cjubran@nvidia.com>
Cc: Vadim Fedorenko <vadim.fedorenko@linux.dev>,
Andrew Lunn <andrew@lunn.ch>,
Michael Chan <michael.chan@broadcom.com>,
Pavan Chebbi <pavan.chebbi@broadcom.com>,
Tariq Toukan <tariqt@nvidia.com>, Gal Pressman <gal@nvidia.com>,
intel-wired-lan@lists.osuosl.org,
Donald Hunter <donald.hunter@gmail.com>,
Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>,
netdev@vger.kernel.org, Yael Chemla <ychemla@nvidia.com>,
Dragos Tatulea <dtatulea@nvidia.com>
Subject: Re: [PATCH net-next v3 3/4] net/mlx5e: Add logic to read RS-FEC histogram bin ranges from PPHCR
Date: Thu, 18 Sep 2025 08:40:00 -0700 [thread overview]
Message-ID: <20250918084000.1b4fb4f4@kernel.org> (raw)
In-Reply-To: <76611a9c-4c53-40a2-96c1-e1cf5b211611@nvidia.com>
On Thu, 18 Sep 2025 18:16:14 +0300 Carolina Jubran wrote:
> On 18/09/2025 17:35, Jakub Kicinski wrote:
> > On Thu, 18 Sep 2025 17:25:40 +0300 Carolina Jubran wrote:
> >>> why does MLX5E_FEC_RS_HIST_MAX exist?
> >>> We care that bins_cnt <= ETHTOOL_FEC_HIST_MAX - 1
> >>> or is there something in the interface that hardcodes 16?
> >> My intention was to keep mlx5 capped at 16 even if ethtool raises its max.
> >> We’ll only increase this once we know the device should expose more than 16.
> >> Since our HW has internal modes that can report more than 16 bins, this
> >> ensures we don’t accidentally expose them if ethtool increases its max.
> > But why?
>
> Because currently those modes shouldn't be exposed for ethernet.
I understand that the modes should not be exposed.
I don't get why this has anything to do with the number of bins.
Does the FW hardcode that the non-Ethernet modes use bins >=16?
When you say "internal modes that can report more than 16 bins"
it sounds like it uses bins starting from 0, e.g. 0..31.
next prev parent reply other threads:[~2025-09-18 15:40 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-16 19:12 [PATCH net-next v3 0/4] add FEC bins histogram report via ethtool Vadim Fedorenko
2025-09-16 19:12 ` [PATCH net-next v3 1/4] ethtool: add FEC bins histogram report Vadim Fedorenko
2025-09-17 11:27 ` [Intel-wired-lan] " Loktionov, Aleksandr
2025-09-18 10:58 ` Vadim Fedorenko
2025-09-19 15:47 ` Tony Nguyen
2025-09-18 0:41 ` Jakub Kicinski
2025-09-18 10:53 ` Vadim Fedorenko
2025-09-18 13:59 ` Jakub Kicinski
2025-09-16 19:12 ` [PATCH net-next v3 2/4] net/mlx5e: Don't query FEC statistics when FEC is disabled Vadim Fedorenko
2025-09-17 11:26 ` [Intel-wired-lan] " Loktionov, Aleksandr
2025-09-16 19:12 ` [PATCH net-next v3 3/4] net/mlx5e: Add logic to read RS-FEC histogram bin ranges from PPHCR Vadim Fedorenko
2025-09-17 11:25 ` [Intel-wired-lan] " Loktionov, Aleksandr
2025-09-18 0:46 ` Jakub Kicinski
2025-09-18 14:25 ` Carolina Jubran
2025-09-18 14:35 ` Jakub Kicinski
2025-09-18 15:16 ` Carolina Jubran
2025-09-18 15:40 ` Jakub Kicinski [this message]
2025-09-18 19:41 ` Carolina Jubran
2025-09-18 22:18 ` Jakub Kicinski
2025-09-19 9:35 ` Carolina Jubran
2025-09-16 19:12 ` [PATCH net-next v3 4/4] net/mlx5e: Report RS-FEC histogram statistics via ethtool Vadim Fedorenko
2025-09-17 11:24 ` [Intel-wired-lan] " Loktionov, Aleksandr
2025-09-18 0:48 ` Jakub Kicinski
2025-09-18 14:32 ` Vadim Fedorenko
2025-09-18 14:40 ` Jakub Kicinski
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