netdev - Re: [PATCH net-next v3 3/6] tcp: add dropreasons in tcp_rcv_state

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Message-ID: <CAL+tcoA=a3F+fjwxdNih=d0gPwCRTBKBhDSr_z8-zVK7s15R6g@mail.gmail.com>
Date: Tue, 13 Feb 2024 07:44:03 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com, 
	dsahern@...nel.org, netdev@...r.kernel.org, 
	Jason Xing <kernelxing@...cent.com>
Subject: Re: [PATCH net-next v3 3/6] tcp: add dropreasons in tcp_rcv_state_process()

On Tue, Feb 13, 2024 at 12:19 AM Eric Dumazet <edumazet@...gle.com> wrote:
>
> On Mon, Feb 12, 2024 at 4:53 PM Jason Xing <kerneljasonxing@...il.com> wrote:
> >
> > Hello Eric,
> >
> > On Mon, Feb 12, 2024 at 11:33 PM Eric Dumazet <edumazet@...gle.com> wrote:
> > >
> > > On Mon, Feb 12, 2024 at 10:29 AM Jason Xing <kerneljasonxing@...il.com> wrote:
> > > >
> > > > From: Jason Xing <kernelxing@...cent.com>
> > >
> > >
> > > >                         if (!acceptable)
> > > > -                               return 1;
> > > > +                               /* This reason isn't clear. We can refine it in the future */
> > > > +                               return SKB_DROP_REASON_TCP_CONNREQNOTACCEPTABLE;
> > >
> > > tcp_conn_request() might return 0 when a syncookie has been generated.
> > >
> > > Technically speaking, the incoming SYN was not dropped :)
> > >
> > > I think you need to have a patch to change tcp_conn_request() and its
> > > friends to return a 'refined' drop_reason
> > > to avoid future questions / patches.
> >
> > Thanks for your advice.
> >
> > Sure. That's on my to-do list since Kuniyuki pointed out[1] this
> > before. I will get it started as soon as the current two patchsets are
> > reviewed. For now, I think, what I wrote doesn't change the old
> > behaviour, right ?
> >
>
> Lets not add a drop_reason that will soon be obsolete.

I will update it(add one or more patches) in the v4 patchset :)

Thanks,
Jason