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Message-ID: <20230307181829.5dcec646@kernel.org>
Date: Tue, 7 Mar 2023 18:18:29 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Tony Nguyen <anthony.l.nguyen@...el.com>
Cc: davem@...emloft.net, pabeni@...hat.com, edumazet@...gle.com,
netdev@...r.kernel.org,
Tirthendu Sarkar <tirthendu.sarkar@...el.com>,
maciej.fijalkowski@...el.com, magnus.karlsson@...el.com,
ast@...nel.org, daniel@...earbox.net, hawk@...nel.org,
john.fastabend@...il.com, bpf@...r.kernel.org,
Chandan Kumar Rout <chandanx.rout@...el.com>
Subject: Re: [PATCH net-next 2/8] i40e: change Rx buffer size for legacy-rx
to support XDP multi-buffer
On Mon, 6 Mar 2023 13:08:16 -0800 Tony Nguyen wrote:
> In the legacy-rx mode, driver can only configure up to 2k sized Rx buffers
> and with the current configuration of 2k sized Rx buffers there is no way
> to do tailroom reservation for skb_shared_info. Hence size of Rx buffers
> is now lowered to 1664 (2k - sizeof(skb_shared_info)). Also, driver can
skb_shared_info is not fixed size, the number of fragments can
be changed in the future. What will happen to the driver and
this assumption, then?
> only chain up to 5 Rx buffers and this means max MTU supported for
> legacy-rx is now 8320.
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