From: Brett Creeley <bcreeley@amd.com>
To: Erwan Velu <e.velu@criteo.com>, Erwan Velu <erwanaliasr1@gmail.com>
Cc: Jesse Brandeburg <jesse.brandeburg@intel.com>,
Tony Nguyen <anthony.l.nguyen@intel.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 iwl-net] i40e: Prevent setting MTU if greater than MFS
Date: Thu, 14 Mar 2024 10:55:02 -0700 [thread overview]
Message-ID: <d16ff01c-4a01-4871-93de-a5c26a352301@amd.com> (raw)
In-Reply-To: <c0ccaef6-44eb-4851-b336-cdb06647e1d2@criteo.com>
On 3/14/2024 10:10 AM, Erwan Velu wrote:
> Caution: This message originated from an External Source. Use proper
> caution when opening attachments, clicking links, or responding.
>
>
> Le 14/03/2024 à 17:10, Brett Creeley a écrit :
> [...]
>> If this is how the max_mtu is determined, does it make sense to set this
>> before registering the netdev, i.e. netdev->max_mtu in
>> i40e_config_netdev()?
>
>
> The absolute max is properly set but I think that's only true if we
> ensure the value of the MFS.
>
> So if with another patch to set the MFS to the right value when asking a
> bigger MTU, having this value makes sense this is the absolute max for
> this device.
AFAIK there is no API for a user to change the max_mtu, so the only way
the device's MFS would need to change is if it's done during
initialization time, which should be done before netdev registration anyway.
I guess it's also possible that the driver's XDP configuration could
cause a change in the device's MFS and netdev->max_mtu, but that would
be under the rtnl_lock.
Seems like others are happy with it, but FWIW that's my 2 cents,
otherwise LGTM.
Reviewed-by: Brett Creeley <brett.creeley@amd.com>
>
>
> Erwan,
>
next prev parent reply other threads:[~2024-03-14 17:55 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-13 9:07 [PATCH v4 iwl-net] i40e: Prevent setting MTU if greater than MFS Erwan Velu
2024-03-14 16:10 ` Brett Creeley
2024-03-14 17:10 ` Erwan Velu
2024-03-14 17:55 ` Brett Creeley [this message]
2024-03-14 18:04 ` Erwan Velu
2024-03-14 20:31 ` Tony Nguyen
2024-03-15 9:17 ` Erwan Velu
2024-03-15 16:19 ` Brett Creeley
2024-03-18 17:45 ` Simon Horman
2024-03-19 10:26 ` Sunil Kovvuri Goutham
[not found] ` <d33b98de-dfc0-445e-bdd7-0ae76d050ed4@criteo.com>
2024-03-19 12:20 ` Simon Horman
2024-03-19 13:33 ` Erwan Velu
2024-04-19 14:26 ` [Intel-wired-lan] " Pucha, HimasekharX Reddy
[not found] ` <CAL2JzuxraP5xCxt4_EK3zbz9kyAyxJFuEadtq4zHsdMjR5PGTw@mail.gmail.com>
2024-04-22 13:19 ` Pucha, HimasekharX Reddy
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