Hello:
This series was applied to netdev/net.git (main)
by Jakub Kicinski <[email protected]>:
On Thu, 5 Mar 2026 12:12:42 +0100 you wrote:
> The current formula for calculating XDP tailroom in mbuf packets works only
> if each frag has its own page (if rxq->frag_size is PAGE_SIZE), this
> defeats the purpose of the parameter overall and without any indication
> leads to negative calculated tailroom on at least half of frags, if shared
> pages are used.
>
> There are not many drivers that set rxq->frag_size. Among them:
> * i40e and enetc always split page uniformly between frags, use shared
> pages
> * ice uses page_pool frags via libeth, those are power-of-2 and uniformly
> distributed across page
> * idpf has variable frag_size with XDP on, so current API is not applicable
> * mlx5, mtk and mvneta use PAGE_SIZE or 0 as frag_size for page_pool
>
> [...]
Here is the summary with links:
- [net,v5,1/9] xdp: use modulo operation to calculate XDP frag tailroom
https://git.kernel.org/netdev/net/c/88b6b7f7b216
- [net,v5,2/9] xsk: introduce helper to determine rxq->frag_size
https://git.kernel.org/netdev/net/c/16394d805399
- [net,v5,3/9] ice: fix rxq info registering in mbuf packets
https://git.kernel.org/netdev/net/c/02852b47c706
- [net,v5,4/9] ice: change XDP RxQ frag_size from DMA write length to
xdp.frame_sz
https://git.kernel.org/netdev/net/c/e142dc4ef0f4
- [net,v5,5/9] i40e: fix registering XDP RxQ info
https://git.kernel.org/netdev/net/c/8f497dc8a614
- [net,v5,6/9] i40e: use xdp.frame_sz as XDP RxQ info frag_size
https://git.kernel.org/netdev/net/c/c69d22c6c46a
- [net,v5,7/9] libeth, idpf: use truesize as XDP RxQ info frag_size
https://git.kernel.org/netdev/net/c/75d9228982f2
- [net,v5,8/9] net: enetc: use truesize as XDP RxQ info frag_size
https://git.kernel.org/netdev/net/c/f8e18abf183d
- [net,v5,9/9] xdp: produce a warning when calculated tailroom is negative
https://git.kernel.org/netdev/net/c/8821e857759b
You are awesome, thank you!
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