netdev - Re: [Patch net-next] sock_map: dump socket map id via diag

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Date:   Sun, 19 Feb 2023 12:22:56 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Yonghong Song <yhs@...a.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        Cong Wang <cong.wang@...edance.com>,
        John Fastabend <john.fastabend@...il.com>,
        Jakub Sitnicki <jakub@...udflare.com>
Subject: Re: [Patch net-next] sock_map: dump socket map id via diag

On Sun, Feb 12, 2023 at 10:29:11PM -0800, Yonghong Song wrote:
> 
> 
> On 2/11/23 12:19 PM, Cong Wang wrote:
> > From: Cong Wang <cong.wang@...edance.com>
> > 
> > Currently there is no way to know which sockmap a socket has been added
> > to from outside, especially for that a socket can be added to multiple
> > sockmap's. We could dump this via socket diag, as shown below.
> > 
> > Sample output:
> > 
> >    # ./iproute2/misc/ss -tnaie --sockmap
> >    ESTAB  0      344329     127.0.0.1:1234     127.0.0.1:40912 ino:21098 sk:5 cgroup:/user.slice/user-0.slice/session-c1.scope <-> sockmap: 1
> > 
> >    # bpftool map
> >    1: sockmap  flags 0x0
> >    	key 4B  value 4B  max_entries 2  memlock 4096B
> > 	pids echo-sockmap(549)
> >    4: array  name pid_iter.rodata  flags 0x480
> > 	key 4B  value 4B  max_entries 1  memlock 4096B
> > 	btf_id 10  frozen
> > 	pids bpftool(624)
> > 
> > In the future, we could dump other sockmap related stats too, hence I
> > make it a nested attribute.
> 
> Have you considered to implement a sockmap iterator? This will be

I think you understand it wrong, I don't want to dump the map, please
double check the above requirement.

Thanks.