netdev - Re: [PATCH net-next v2] tcp: Add skb addr and sock addr to arguments of tracepoint tcp

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Message-ID: <CAL+tcoBbBgubwcghyT30Zk7g8SZYbTx1fKCvPDYqcJjQ8eGbOQ@mail.gmail.com>
Date: Mon, 4 Mar 2024 15:05:43 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: edumazet@...gle.com, rostedt@...dmis.org, mhiramat@...nel.org, 
	mathieu.desnoyers@...icios.com, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, 
	fuyuanli@...iglobal.com
Subject: Re: [PATCH net-next v2] tcp: Add skb addr and sock addr to arguments
 of tracepoint tcp_probe.

On Mon, Mar 4, 2024 at 11:46 AM fuyuanli <fuyuanli@...iglobal.com> wrote:
>
> It is useful to expose skb addr and sock addr to user in tracepoint
> tcp_probe, so that we can get more information while monitoring
> receiving of tcp data, by ebpf or other ways.
>
> For example, we need to identify a packet by seq and end_seq when
> calculate transmit latency between lay 2 and lay 4 by ebpf, but which is
> not available in tcp_probe, so we can only use kprobe hooking
> tcp_rcv_esatblised to get them. But we can use tcp_probe directly if skb
> addr and sock addr are available, which is more efficient.
>
> Signed-off-by: fuyuanli <fuyuanli@...iglobal.com>
> Link: https://lore.kernel.org/netdev/20240229052813.GA23899@didi-ThinkCentre-M920t-N000/

Reviewed-by: Jason Xing <kerneljasonxing@...il.com>