netdev - Re: [PATCH v4 net-next] r8169: Add values missing in @get

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Date:	Wed, 26 Aug 2015 10:54:46 +0200
From:	Corinna Vinschen <vinschen@...hat.com>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	hayeswang@...ltek.com, ivecera@...hat.com, nic_swsd@...ltek.com
Subject: Re: [PATCH v4 net-next] r8169: Add values missing in @get_stats64
 from HW counters

On Aug 26 00:54, Francois Romieu wrote:
> David Miller <davem@...emloft.net> :
> [...]
> > Your counter offsets should be read at probe time, not open time.
> 
> It can be done but the "CmdRxEnb / rx traffic must be enabled" constraint
> will make it a major pita. 
> 
> Reading counter offsets at the end of open() naturally solves this
> constraint (retentive error unwinding in opne() stops being completely
> trivial though :o/ ).
> 
> > Bringing the interface is brought down/up should not reset the
> > counters.
> 
> Afaiks rtl8169_tc_offsets.inited in rtl8169_init_counter_offsets
> takes care of it: it's set during the first open() after probe().
> 
> Looking at it again, the patch directly stores 16 and 32 bit values
> in rtnl_link_stats64. Nobody should care about exact exceedingly high
> error count but rx_multicast ought to be accumulated.

I'll have a look into that for a followup patch.


Thanks,
Corinna

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