netdev - Re: [PATCH net-next v3 03/23] net: ethtool: report max value for rx-buf-len

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Message-ID: <CAHS8izPyDDxtDM4KcnuHzr0BJ3WYd1mv8gJEjG3zAW=Va4yG0Q@mail.gmail.com>
Date: Mon, 18 Aug 2025 17:00:14 -0700
From: Mina Almasry <almasrymina@...gle.com>
To: Pavel Begunkov <asml.silence@...il.com>
Cc: Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org, 
	Eric Dumazet <edumazet@...gle.com>, Willem de Bruijn <willemb@...gle.com>, 
	Paolo Abeni <pabeni@...hat.com>, andrew+netdev@...n.ch, horms@...nel.org, 
	davem@...emloft.net, sdf@...ichev.me, dw@...idwei.uk, 
	michael.chan@...adcom.com, dtatulea@...dia.com, ap420073@...il.com, 
	linux-kernel@...r.kernel.org, io-uring@...r.kernel.org
Subject: Re: [PATCH net-next v3 03/23] net: ethtool: report max value for rx-buf-len

On Mon, Aug 18, 2025 at 6:56 AM Pavel Begunkov <asml.silence@...il.com> wrote:
>
> From: Jakub Kicinski <kuba@...nel.org>
>
> Unlike most of our APIs the rx-buf-len param does not have an associated
> max value. In theory user could set this value pretty high, but in
> practice most NICs have limits due to the width of the length fields
> in the descriptors.
>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> Signed-off-by: Pavel Begunkov <asml.silence@...il.com>

The other driver that supports rx_buf_len I think is hns3, and I think
you can set the max_rx_buf_len as RX_BUF_LEN_4K there? It only support
2K and 4K.

Other than that, looks good to me,

Reviewed-by: Mina Almasry <almasrymina@...gle.com>

-- 
Thanks,
Mina