> -----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.
