lkml.org 
[lkml]   [2020]   [Nov]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v1 net-next] net: dsa: qca: ar9331: add ethtool stats support
On Tue, 17 Nov 2020 00:21:46 +0200 Vladimir Oltean wrote:
> On Mon, Nov 16, 2020 at 01:34:53PM -0800, Jakub Kicinski wrote:
> > You must expose relevant statistics via the normal get_stats64 NDO
> > before you start dumping free form stuff in ethtool -S.
>
> Completely agree on the point, Jakub, but to be honest we don't give him
> that possibility within the DSA framework today, see .ndo_get_stats64 in
> net/dsa/slave.c which returns the generic dev_get_tstats64 implementation,
> and not something that hooks into the hardware counters, or into the
> driver at all, for that matter.

Simple matter of coding, right? I don't see a problem.

Also I only mentioned .ndo_get_stats64, but now we also have stats in
ethtool->get_pause_stats.

> But it's good that you raise the point, I was thinking too that we
> should do better in terms of keeping the software counters in sync with
> the hardware. But what would be a good reference for keeping statistics
> on an offloaded interface? Is it ok to just populate the netdev counters
> based on the hardware statistics?

IIRC the stats on the interface should be a sum of forwarded in software
and in hardware. Which in practice means interface HW stats are okay,
given eventually both forwarding types end up in the HW interface
(/MAC block).

> And what about the statistics gathered
> today in software, could we return them maybe via something like ifstat
> --extended=cpu_hits?

Yup, exactly, that's what --extended=cpu_hits is for.

\
 
 \ /
  Last update: 2020-11-16 23:36    [W:0.065 / U:1.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site