linux-kernel - Re: [PATCH net v2] net: sunhme: Fix packet reception for len < RX_COPY

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Date:   Thu, 22 Sep 2022 14:10:16 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Sean Anderson <seanga2@...il.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, nbowler@...conx.ca,
        eike-kernel@...tec.de, zheyuma97@...il.com, andrew@...n.ch
Subject: Re: [PATCH net v2] net: sunhme: Fix packet reception for len <
 RX_COPY_THRESHOLD

Hello:

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

On Tue, 20 Sep 2022 19:50:18 -0400 you wrote:
> There is a separate receive path for small packets (under 256 bytes).
> Instead of allocating a new dma-capable skb to be used for the next packet,
> this path allocates a skb and copies the data into it (reusing the existing
> sbk for the next packet). There are two bytes of junk data at the beginning
> of every packet. I believe these are inserted in order to allow aligned DMA
> and IP headers. We skip over them using skb_reserve. Before copying over
> the data, we must use a barrier to ensure we see the whole packet. The
> current code only synchronizes len bytes, starting from the beginning of
> the packet, including the junk bytes. However, this leaves off the final
> two bytes in the packet. Synchronize the whole packet.
> 
> [...]

Here is the summary with links:
  - [net,v2] net: sunhme: Fix packet reception for len < RX_COPY_THRESHOLD
    https://git.kernel.org/netdev/net/c/878e2405710a

You are awesome, thank you!
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