linux-kernel - Re: [RFC PATCH bpf-next v6 2/3] net: Add additional bit to support clockid

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Date: Tue, 07 May 2024 07:39:28 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Martin KaFai Lau <martin.lau@...ux.dev>, 
 Abhishek Chauhan <quic_abchauha@...cinc.com>
Cc: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, 
 netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Andrew Halaney <ahalaney@...hat.com>, 
 Willem de Bruijn <willemdebruijn.kernel@...il.com>, 
 Martin KaFai Lau <martin.lau@...nel.org>, 
 Daniel Borkmann <daniel@...earbox.net>, 
 bpf <bpf@...r.kernel.org>, 
 kernel@...cinc.com
Subject: Re: [RFC PATCH bpf-next v6 2/3] net: Add additional bit to support
 clockid_t timestamp type

Martin KaFai Lau wrote:
> On 5/3/24 8:13 PM, Abhishek Chauhan wrote:
> > diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
> > index fe86cadfa85b..c3d852eecb01 100644
> > --- a/net/ipv4/ip_output.c
> > +++ b/net/ipv4/ip_output.c
> > @@ -1457,7 +1457,10 @@ struct sk_buff *__ip_make_skb(struct sock *sk,
> >   
> >   	skb->priority = (cork->tos != -1) ? cork->priority: READ_ONCE(sk->sk_priority);
> >   	skb->mark = cork->mark;
> > -	skb->tstamp = cork->transmit_time;
> > +	if (sk_is_tcp(sk))
> 
> This seems not catching all IPPROTO_TCP case. In particular, the percpu 
> "ipv4_tcp_sk" is SOCK_RAW. sk_is_tcp() is checking SOCK_STREAM:
> 
> void __init tcp_v4_init(void)
> {
> 
> 	/* ... */
> 	res = inet_ctl_sock_create(&sk, PF_INET, SOCK_RAW,
> 				   IPPROTO_TCP, &init_net);
> 
> 	/* ... */
> }
> 
> "while :; do ./test_progs -t tc_redirect/tc_redirect_dtime || break; done" 
> failed pretty often exactly in this case.
> 

Interesting. The TCP stack opens non TCP sockets.

Initializing sk->sk_clockid for this socket should address that.