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Date: Sat, 9 Oct 2021 19:42:49 +0300
From: Vladimir Oltean <olteanv@...il.com>
To: Yajun Deng <yajun.deng@...ux.dev>
Cc: davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: procfs: add seq_puts() statement for
dev_mcast
On Sat, Oct 09, 2021 at 07:35:11PM +0300, Vladimir Oltean wrote:
> On Mon, Aug 16, 2021 at 04:57:57PM +0800, Yajun Deng wrote:
> > Add seq_puts() statement for dev_mcast, make it more readable.
> > As also, keep vertical alignment for {dev, ptype, dev_mcast} that
> > under /proc/net.
> >
> > Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>
> > ---
>
> FYI, this program got broken by this commit (reverting it restores
> functionality):
>
> root@...ian:~# ifstat
> ifstat: /proc/net/dev: unsupported format.
>
> Confusingly enough, the "ifstat" provided by Debian is not from iproute2:
> https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/tree/misc/ifstat.c
> but rather a similarly named program:
> https://packages.debian.org/source/bullseye/ifstat
> https://github.com/matttbe/ifstat
>
> I haven't studied how this program parses /proc/net/dev, but here's how
> the kernel's output changed:
Ah, it scrapes the text for "Inter-|":
https://github.com/matttbe/ifstat/blob/main/drivers.c#L825
>
> Doesn't work:
>
> root@...ian:~# cat /proc/net/dev
> Interface| Receive | Transmit
> | bytes packets errs drop fifo frame compressed multicast| bytes packets errs drop fifo colls carrier compressed
> lo: 97400 1204 0 0 0 0 0 0 97400 1204 0 0 0 0 0 0
> bond0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> sit0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> eno2: 5002206 6651 0 0 0 0 0 0 105518642 1465023 0 0 0 0 0 0
> swp0: 134531 2448 0 0 0 0 0 0 99599598 1464381 0 0 0 0 0 0
> swp1: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> swp2: 4867675 4203 0 0 0 0 0 0 58134 631 0 0 0 0 0 0
> sw0p0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> sw0p1: 124739 2448 0 1422 0 0 0 0 93741184 1464369 0 0 0 0 0 0
> sw0p2: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> sw2p0: 4850863 4203 0 0 0 0 0 0 54722 619 0 0 0 0 0 0
> sw2p1: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> sw2p2: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> sw2p3: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> br0: 10508 212 0 212 0 0 0 212 61369558 958857 0 0 0 0 0 0
>
> Works:
>
> root@...ian:~# cat /proc/net/dev
> Inter-| Receive | Transmit
> face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed
> lo: 13160 164 0 0 0 0 0 0 13160 164 0 0 0 0 0 0
> bond0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> sit0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> eno2: 30824 268 0 0 0 0 0 0 3332 37 0 0 0 0 0 0
> swp0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> swp1: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> swp2: 30824 268 0 0 0 0 0 0 2428 27 0 0 0 0 0 0
> sw0p0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> sw0p1: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> sw0p2: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> sw2p0: 29752 268 0 0 0 0 0 0 1564 17 0 0 0 0 0 0
> sw2p1: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> sw2p2: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> sw2p3: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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