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Message-ID: <69c55618-931a-48f4-a25c-0d5666bcb5cb@quicinc.com>
Date: Tue, 7 May 2024 12:38:51 -0700
From: "Abhishek Chauhan (ABC)" <quic_abchauha@...cinc.com>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>,
Martin KaFai Lau
<martin.lau@...ux.dev>
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>,
"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
On 5/7/2024 12:18 PM, Willem de Bruijn wrote:
> Abhishek Chauhan (ABC) wrote:
>>
>>
>> On 5/7/2024 4:39 AM, Willem de Bruijn wrote:
>>> 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.
>>>
>> Willem, Are you suggesting your point from the previous patch ?
>>
>
> No, just for this custom socket to initialize the sk_clockid. It is
> not a TCP socket, but only used by TCP.
Thanks Willem,
Noted! Which means there are only two places these custom RAW tcp socket
are getting called
1. tcp_ipv4.c
2. tcp_ipv6.c
I will take care of initializing sk_clockid to monotonic in the next patch
in the above two files.
Let me know if i missed out anything.
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