netdev - Re: [PATCH net-next] net: preserve sock reference when scrubbing the skb.

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Message-ID: <CAM_iQpVmbuVK+pfhad7HrQtaSxFbe7K=59_34f0BwxoP_=W0VQ@mail.gmail.com>
Date:   Tue, 26 Jun 2018 17:29:51 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Flavio Leitner <fbl@...hat.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        David Miller <davem@...emloft.net>,
        Florian Westphal <fw@...len.de>,
        NetFilter <netfilter-devel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: preserve sock reference when scrubbing the skb.

On Tue, Jun 26, 2018 at 4:33 PM Flavio Leitner <fbl@...hat.com> wrote:
>
> It is still isolated, the sk carries the netns info and it is
> orphaned when it re-enters the stack.

Then what difference does your patch make?

Before your patch:
veth orphans skb in its xmit

After your patch:
RX orphans it when re-entering stack (as you claimed, I don't know)

And for veth pair:
xmit from one side is RX for the other side

So, where is the queueing? Where is the buffer bloat? GRO list??