netdev - Re: [PATCH net-next 11/11] tcp: increase tcp

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Message-ID: <20250514212832.83713-1-kuniyu@amazon.com>
Date: Wed, 14 May 2025 14:28:27 -0700
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: <kuba@...nel.org>
CC: <bpf@...r.kernel.org>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<eric.dumazet@...il.com>, <horms@...nel.org>, <jonesrick@...gle.com>,
	<kuniyu@...zon.com>, <ncardwell@...gle.com>, <netdev@...r.kernel.org>,
	<pabeni@...hat.com>, <weiwan@...gle.com>
Subject: Re: [PATCH net-next 11/11] tcp: increase tcp_rmem[2] to 32 MB

From: Jakub Kicinski <kuba@...nel.org>
Date: Wed, 14 May 2025 14:26:20 -0700
> On Wed, 14 May 2025 14:20:05 -0700 Kuniyuki Iwashima wrote:
> > > It seems ACK was not handled by BPF at tc hook on lo.
> > > 
> > > ACK was not sent or tcp_load_headers() failed to parse it ?
> > > both sounds unlikely though.
> > > 
> > > Will try to reproduce it.  
> > 
> > I hard-coded the expected TCPOPT_WINDOW to be 7, and this
> > series bumps it to 10, so SYN was dropped as invalid.
> > 
> > This fixes the failure, and I think it's not a blocker.
> > 
> > ---8<---
> > diff --git a/tools/testing/selftests/bpf/progs/test_tcp_custom_syncookie.c b/tools/testing/selftests/bpf/progs/test_tcp_custom_syncookie.c
> > index eb5cca1fce16..7d5293de1952 100644
> > --- a/tools/testing/selftests/bpf/progs/test_tcp_custom_syncookie.c
> > +++ b/tools/testing/selftests/bpf/progs/test_tcp_custom_syncookie.c
> > @@ -294,7 +294,9 @@ static int tcp_validate_sysctl(struct tcp_syncookie *ctx)
> >  	    (ctx->ipv6 && ctx->attrs.mss != MSS_LOCAL_IPV6))
> >  		goto err;
> >  
> > -	if (!ctx->attrs.wscale_ok || ctx->attrs.snd_wscale != 7)
> > +	if (!ctx->attrs.wscale_ok ||
> > +	    !ctx->attrs.snd_wscale ||
> > +	    ctx->attrs.snd_wscale >= BPF_SYNCOOKIE_WSCALE_MASK)
> >  		goto err;
> >  
> >  	if (!ctx->attrs.tstamp_ok)
> 
> Awesome, could you submit officially? As soon as your fix is in
> patchwork I can return Eric's series into the testing branch.

For sure, will post a patch shortly.