netdev - Re: [PATCH net-next] tcp: fix zerocopy and notsent

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Message-ID: <CAF=yD-+EFXzURpEuzJisPGG_1f+-Lok2iqMz=7ag_VTK2c=dDA@mail.gmail.com>
Date:   Mon, 25 Mar 2019 16:50:44 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Soheil Hassas Yeganeh <soheil@...gle.com>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net-next] tcp: fix zerocopy and notsent_lowat issues

On Mon, Mar 25, 2019 at 4:48 PM Soheil Hassas Yeganeh <soheil@...gle.com> wrote:
>
> On Mon, Mar 25, 2019 at 4:44 PM Eric Dumazet <edumazet@...gle.com> wrote:
> >
> > My recent patch had at least two problems :
> >
> > 1) TX zerocopy wants notification when skb is acknowledged,
> >    thus we need to call skb_zcopy_clear() if the skb is
> >    cached into sk->sk_tx_skb_cache
> >
> > 2) Some applications might expect precise EPOLLOUT notifications,
> >    so we need to update sk->sk_wmem_queued and call
> >    sk_mem_uncharge() from sk_wmem_free_skb() in all cases.
> >    The SOCK_QUEUE_SHRUNK flag must also be set.
> >
> > Fixes: 472c2e07eef0 ("tcp: add one skb cache for tx")
> > Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> > Cc: Willem de Bruijn <willemb@...gle.com>
> > Cc: Soheil Hassas Yeganeh <soheil@...gle.com>
>
> Acked-by: Soheil Hassas Yeganeh <soheil@...gle.com>

Acked-by: Willem de Bruijn <willemb@...gle.com>