netdev - Re: [PATCH bpf] Revert "xsk: simplify AF

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Date:   Thu, 21 Feb 2019 16:36:09 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Björn Töpel <bjorn.topel@...il.com>,
        ast@...nel.org, netdev@...r.kernel.org
Cc:     Björn Töpel <bjorn.topel@...el.com>,
        magnus.karlsson@...el.com, magnus.karlsson@...il.com
Subject: Re: [PATCH bpf] Revert "xsk: simplify AF_XDP socket teardown"

On 02/21/2019 01:07 PM, Björn Töpel wrote:
> From: Björn Töpel <bjorn.topel@...el.com>
> 
> This reverts commit e2ce3674883ecba2605370404208c9d4a07ae1c3.
> 
> It turns out that the sock destructor xsk_destruct was needed after
> all. The cleanup simplification broke the skb transmit cleanup path,
> due to that the umem was prematurely destroyed.
> 
> The umem cannot be destroyed until all outstanding skbs are freed,
> which means that we cannot remove the umem until the sk_destruct has
> been called.
> 
> Signed-off-by: Björn Töpel <bjorn.topel@...el.com>

Applied, thanks!