Re: [PATCH net] xsk: restore UMEM flags after failed pool assignment

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@xxxxxxxxxx>:

On Wed, 21 Oct 2026 22:47:33 +0000 you wrote:
> xp_assign_dev() sets XDP_UMEM_SG_FLAG before checking whether the
> device supports multibuffer zero-copy. If assignment fails, xsk_bind()
> destroys the pool but retains the registered UMEM. A subsequent bind
> without XDP_USE_SG inherits the stale flag.
> 
> The flag also changes RX buffer sizing after DMA mapping. On igc, a
> failed SG bind followed by a non-SG retry with 4096-byte chunks and
> 1792 bytes of headroom passes admission with 2048 bytes, but programs
> a 1024-byte RX buffer. On I225-V hardware, an ordinary 1514-byte frame
> is truncated to 1024 bytes or 1008 with RX timestamps enabled.
> Restoring the original flags eliminates the truncation in both cases.
> 
> [...]

Here is the summary with links:
  - [net] xsk: restore UMEM flags after failed pool assignment
    https://git.kernel.org/netdev/net/c/b88b826ec54a

You are awesome, thank you!
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