RE: [PATCH net-next 2/8] i40e: change Rx buffer size for legacy-rx to support XDP multi-buffer

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> -----Original Message-----
> From: Jakub Kicinski <kuba@xxxxxxxxxx>
> 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?
> 

This is for the non-default path in legacy mode. If for some reason number of 
fragments increase in future, we may have to think of other options like using
page pools.

> > only chain up to 5 Rx buffers and this means max MTU supported for
> > legacy-rx is now 8320.




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