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Message-ID: <6657cdd65fede_37107c29432@willemb.c.googlers.com.notmuch>
Date: Wed, 29 May 2024 20:52:38 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Jakub Kicinski <kuba@...nel.org>,
Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc: netdev@...r.kernel.org,
pabeni@...hat.com,
borisp@...dia.com,
gal@...dia.com,
cratiu@...dia.com,
rrameshbabu@...dia.com,
steffen.klassert@...unet.com,
tariqt@...dia.com
Subject: Re: [RFC net-next 07/15] net: psp: update the TCP MSS to reflect PSP
packet overhead
Jakub Kicinski wrote:
> On Sun, 12 May 2024 21:47:16 -0400 Willem de Bruijn wrote:
> > > - inet_csk(newsk)->icsk_ext_hdr_len = 0;
> > > + inet_csk(newsk)->icsk_ext_hdr_len = psp_sk_overhead(sk);
> > > if (opt)
> > > - inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen +
> > > - opt->opt_flen;
> > > + inet_csk(newsk)->icsk_ext_hdr_len += opt->opt_nflen +
> > > + opt->opt_flen;
> > >
> > > tcp_ca_openreq_child(newsk, dst);
> >
> > The below code adjusts ext_hdr_len and recalculates mss when
> > setting the tx association.
> >
> > Why already include it at connect and syn_recv, above?
> >
> > My assumption was that the upgrade to PSP only happens during
> > TCP_ESTABLISHED. But perhaps I'm wrong.
> >
> > Is it allowed to set rx and tx association even from as early as the
> > initial socket(), when still in TCP_CLOSE, client-side?
> >
> > Server-side, there is no connection fd to pass to netlink commands
> > before TCP_ESTABLISHED.
>
> Mostly for symmetry, really. IDK what's worse, the dead code or that
> someone may be surprised it's not there.. Should I delete it?
Symmetry with what?
This dead code had me scratching my head what it was doing, so my vote
to drop it. If you want something, maybe a code comment instead?
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