netdev - Gianfar ethernet drop package

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Date:	Fri, 24 Aug 2012 17:14:38 +0100
From:	Aníbal Almeida Pinto <anibal.pinto@...cec.com>
To:	<netdev@...r.kernel.org>
Subject: Gianfar ethernet drop package

Hi,

I have an board with a ppc with a 8379, kernel 3.0.39 and with a Gianfar 
Ethernet Controller Version 1.2.

When connect the board to office network the number of dropped packets 
reported by ifconfig continues to increase.

Following the test made at [1] I use tcpdump and when running it the 
number of drop packages don't have increased.

When executing ethtool eth0 -S it return a rx-dropped-by-kernel != 0. 
And the rest of drop packages

Is possible to get info why the packages are dropped?

What is the relation between ethtool rx-dropped-by-kernel and ifconfig 
drop package ?

The output from ifconfig eth0 and ethtool -S eth0 executed one after other:


# ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:1D:11:91:00:00
           inet addr:172.18.208.187  Bcast:0.0.0.0  Mask:255.255.252.0
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:967819 errors:0 dropped:54676 overruns:0 frame:0
           TX packets:467 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:110916831 (105.7 MiB)  TX bytes:45317 (44.2 KiB)
           Base address:0x8000

ethtool -S eth0
NIC statistics:
      rx-dropped-by-kernel: 628278
      rx-large-frame-errors: 0
      rx-short-frame-errors: 0
      rx-non-octet-errors: 0
      rx-crc-errors: 0
      rx-overrun-errors: 0
      rx-busy-errors: 0
      rx-babbling-errors: 0
      rx-truncated-frames: 0
      ethernet-bus-error: 0
      tx-babbling-errors: 0
      tx-underrun-errors: 0
      rx-skb-missing-errors: 0
      tx-timeout-errors: 0
      tx-rx-64-frames: 227705
      tx-rx-65-127-frames: 743446
      tx-rx-128-255-frames: 117818
      tx-rx-256-511-frames: 43480
      tx-rx-512-1023-frames: 21406
      tx-rx-1024-1518-frames: 81741
      tx-rx-1519-1522-good-vlan: 0
      rx-bytes: 239178758
      rx-packets: 1235130
      rx-fcs-errors: 2
      receive-multicast-packet: 293898
      receive-broadcast-packet: 936991
      rx-control-frame-packets: 0
      rx-pause-frame-packets: 0
      rx-unknown-op-code: 0
      rx-alignment-error: 0
      rx-frame-length-error: 0
      rx-code-error: 0
      rx-carrier-sense-error: 1
      rx-undersize-packets: 0
      rx-oversize-packets: 0
      rx-fragmented-frames: 0
      rx-jabber-frames: 1
      rx-dropped-frames: 0
      tx-byte-counter: 51355
      tx-packets: 467
      tx-multicast-packets: 0
      tx-broadcast-packets: 132
      tx-pause-control-frames: 0
      tx-deferral-packets: 0
      tx-excessive-deferral-packets: 0
      tx-single-collision-packets: 0
      tx-multiple-collision-packets: 0
      tx-late-collision-packets: 0
      tx-excessive-collision-packets: 0
      tx-total-collision: 0
      reserved: 0
      tx-dropped-frames: 0
      tx-jabber-frames: 0
      tx-fcs-errors: 0
      tx-control-frames: 0
      tx-oversize-frames: 0
      tx-undersize-frames: 0
      tx-fragmented-frames: 0

[1] - http://www.novell.com/support/kb/doc.php?id=7007165

Thanks.

Regards,
Aníbal

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