Re: [PATCH net-next] udp: Add tracepoint for udp_sendmsg()

David Ahern
2025-04-17T15:55:31Z

On 4/17/25 5:42 AM, Breno Leitao wrote:
> Hello David,
>
> On Wed, Apr 16, 2025 at 04:16:26PM -0700, David Ahern wrote:
>> On 4/16/25 1:23 PM, Breno Leitao wrote:
>>> diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
>>> index f9f5b92cf4b61..8c2902504a399 100644
>>> --- a/net/ipv4/udp.c
>>> +++ b/net/ipv4/udp.c
>>> @@ -1345,6 +1345,8 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
>>> connected = 1;
>>> }
>>>
>>> + trace_udp_sendmsg_tp(sk, msg);
>>
>> why `_tp` suffix? the usual naming is trace_${func}
>
> I got the impression that DECLARE_TRACE() raw tracepoints names end up
> in _tp():
>
> include/trace/events/tcp.h
> DECLARE_TRACE(tcp_cwnd_reduction_tp,

that is the only networking one:

$ git grep trace_ net drivers/net | grep _tp
net/bpf/test_run.c: trace_bpf_trigger_tp(nonce);
net/ipv4/tcp_input.c: trace_tcp_cwnd_reduction_tp(sk,
newly_acked_sacked, newly_lost, flag);

The rest follow do not have the _tp suffix:

$ git grep trace_ net drivers/net | wc -l
2727

2725 without; 2 with