netdev - Re: [PATCH bpf] xsk: Fix handling of invalid descriptors in XSK Tx batching API

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Message-Id: <165469861241.22143.18204022493863503886.git-patchwork-notify@kernel.org>
Date:   Wed, 08 Jun 2022 14:30:12 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        netdev@...r.kernel.org, magnus.karlsson@...el.com, bjorn@...nel.org
Subject: Re: [PATCH bpf] xsk: Fix handling of invalid descriptors in XSK Tx
 batching API

Hello:

This patch was applied to bpf/bpf.git (master)
by Daniel Borkmann <daniel@...earbox.net>:

On Tue,  7 Jun 2022 16:22:00 +0200 you wrote:
> Xdpxceiver run on a AF_XDP ZC enabled driver revealed a problem with XSK
> Tx batching API. There is a test that checks how invalid Tx descriptors
> are handled by AF_XDP. Each valid descriptor is followed by invalid one
> on Tx side whereas the Rx side expects only to receive a set of valid
> descriptors.
> 
> In current xsk_tx_peek_release_desc_batch() function, the amount of
> available descriptors is hidden inside xskq_cons_peek_desc_batch(). This
> can be problematic in cases where invalid descriptors are present due to
> the fact that xskq_cons_peek_desc_batch() returns only a count of valid
> descriptors. This means that it is impossible to properly update XSK
> ring state when calling xskq_cons_release_n().
> 
> [...]

Here is the summary with links:
  - [bpf] xsk: Fix handling of invalid descriptors in XSK Tx batching API
    https://git.kernel.org/bpf/bpf/c/d678cbd2f867

You are awesome, thank you!
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