netdev - Re: [PATCH net-next-2.6] ixgbe: fix ethtool stats

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Date:	Wed, 21 Jul 2010 22:47:59 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	David Miller <davem@...emloft.net>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	PJ Waskiewicz <peter.p.waskiewicz.jr@...el.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next-2.6] ixgbe: fix ethtool stats

Le mercredi 21 juillet 2010 à 13:17 -0700, Jeff Kirsher a écrit :
> On Tue, Jul 20, 2010 at 19:38, Eric Dumazet <eric.dumazet@...il.com> wrote:
> > Le mardi 20 juillet 2010 à 15:06 -0700, Jeff Kirsher a écrit :
> >> On Tue, Jul 20, 2010 at 10:28, Eric Dumazet <eric.dumazet@...il.com> wrote:
> >> > Note : I am currently unable to test following patch, could you please
> >> > Intel guys test it and Ack (or Nack) it ?
> >> >
> >> > Thanks !
> >> >
> >> > [PATCH net-next-2.6] ixgbe: fix ethtool stats
> >> >
> >> > In latest changes about 64bit stats on 32bit arches,
> >> > [commit 28172739f0a276eb8 (net: fix 64 bit counters on 32 bit arches)],
> >> > I missed ixgbe uses a bit of magic in its ixgbe_gstrings_stats
> >> > definition.
> >> >
> >> > IXGBE_NETDEV_STAT() must now assume offsets relative to
> >> > rtnl_link_stats64, not relative do dev->stats.
> >> >
> >> > As a bonus, we also get 64bit stats on ethtool -S
> >> >
> >> > Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> >> > ---
> >> >  drivers/net/ixgbe/ixgbe_ethtool.c |   42 ++++++++++++++--------------
> >> >  1 file changed, 21 insertions(+), 21 deletions(-)
> >> >
> >>
> >> Thanks Eric, I have added it to my queue.
> >>
> >
> > Thanks !
> >
> > By the way, my ixgbe conf doesnt like net-next-2.6 at all.
> > (No link is established in my fiber loop configuration)
> >
> > current linux-2.6 git runs correctly, link at 10Gb, so there is a
> > regression somewhere.
> >
> > As this machine is quite slow (I dont have anymore my Nehalem dev
> > machine, had to use an old setup), a bisection would take one month...
> >
> >
> 
> Eric - can you send your setup and .config so that we can take a look
> at why your not getting a link?
> 

It seems trying to use two ports of same card in back to back is
problematic.

Finally, I tested this patch, with two machines and two dual port cards
[82599EB 10-Gigabit Network Connection (rev 01)]
(courtesy from Intel), and everything is fine.

Tested-by: Eric Dumazet <eric.dumazet@...il.com>

# ethtool -S eth1
NIC statistics:
     rx_packets: 2750925
     tx_packets: 2747612
     rx_bytes: 1668189088
     tx_bytes: 1667871060
     rx_pkts_nic: 2750926
     tx_pkts_nic: 2747612
     rx_bytes_nic: 1679192890
     tx_bytes_nic: 1678861724

I'll submit another patch because this driver updates
netdev->stats.rx_bytes/rx_packets in a racy way (several cpus can do
these updates concurrently)

Implementing a get_stats() method to fold rx_ring counters will solve
this and brings 64bit counters as well for RX side.
(TX counters are already 64bit enabled)



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