linux-kernel - Re: [PATCH v2 net-next] net: udp: introduce UDP_MIB_MEMERRORS for udp

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Message-ID: <20201109164031.5f4fc0ab@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 9 Nov 2020 16:40:31 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     menglong8.dong@...il.com
Cc:     kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org, davem@...emloft.net,
        ycheng@...gle.com, ncardwell@...gle.com, priyarjha@...gle.com,
        edumazet@...gle.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, willemb@...gle.com,
        pabeni@...hat.com, Menglong Dong <dong.menglong@....com.cn>
Subject: Re: [PATCH v2 net-next] net: udp: introduce UDP_MIB_MEMERRORS for
 udp_mem

On Thu,  5 Nov 2020 20:49:14 -0500 menglong8.dong@...il.com wrote:
> From: Menglong Dong <dong.menglong@....com.cn>
> 
> When udp_memory_allocated is at the limit, __udp_enqueue_schedule_skb
> will return a -ENOBUFS, and skb will be dropped in __udp_queue_rcv_skb
> without any counters being done. It's hard to find out what happened
> once this happen.
> 
> So we introduce a UDP_MIB_MEMERRORS to do this job. Well, this change
> looks friendly to the existing users, such as netstat:
> 
> $ netstat -u -s
> Udp:
>     0 packets received
>     639 packets to unknown port received.
>     158689 packet receive errors
>     180022 packets sent
>     RcvbufErrors: 20930
>     MemErrors: 137759
> UdpLite:
> IpExt:
>     InOctets: 257426235
>     OutOctets: 257460598
>     InNoECTPkts: 181177
> 
> v2:
> - Fix some alignment problems
> 
> Signed-off-by: Menglong Dong <dong.menglong@....com.cn>

Applied, thanks!