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Date:	Fri, 8 Jan 2010 10:25:50 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	"Matt Carlson" <mcarlson@...adcom.com>
Cc:	"Eric Dumazet" <eric.dumazet@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: tg3 appears to be sick in 2.6.33

On Friday 08 January 2010 10:09:15 am Matt Carlson wrote:
> On Thu, Jan 07, 2010 at 05:36:00PM -0800, Dmitry Torokhov wrote:
> > On Thu, Jan 07, 2010 at 04:14:54PM -0800, Dmitry Torokhov wrote:
> > > On Thu, Jan 07, 2010 at 03:53:09PM -0800, Matt Carlson wrote:
> > > > On Thu, Jan 07, 2010 at 02:45:43PM -0800, Dmitry Torokhov wrote:
> > > > > On Thursday 07 January 2010 02:24:44 pm Eric Dumazet wrote:
> > > > > > Le 07/01/2010 21:48, Matt Carlson a ?crit :
> > > > > > > Nothing jumps to mind.  Let me see if I can repro this here.
> > > > > > >
> > > > > > > On Thu, Jan 07, 2010 at 11:56:31AM -0800, Dmitry Torokhov wrote:
> > > > > > >> Hi,
> > > > > > >>
> > > > > > >> Ever since I moved post 2.6.32 tg3 seems to be very sick in my
> > > > > > >> Latitude D630, it discards most of the packages for some
> > > > > > >> reason:
> > > > > > >>
> > > > > > >> [root@...r-d630 ~]# ethtool -S eth0 | grep rx_
> > > > > > >>      rx_octets: 35886
> > > > > > >>      rx_fragments: 0
> > > > > > >>      rx_ucast_packets: 9
> > > > > > >>      rx_mcast_packets: 93
> > > > > > >>      rx_bcast_packets: 237
> > > > > > >>      rx_fcs_errors: 0
> > > > > > >>      rx_align_errors: 0
> > > > > > >>      rx_xon_pause_rcvd: 0
> > > > > > >>      rx_xoff_pause_rcvd: 0
> > > > > > >>      rx_mac_ctrl_rcvd: 0
> > > > > > >>      rx_xoff_entered: 0
> > > > > > >>      rx_frame_too_long_errors: 0
> > > > > > >>      rx_jabbers: 0
> > > > > > >>      rx_undersize_packets: 0
> > > > > > >>      rx_in_length_errors: 0
> > > > > > >>      rx_out_length_errors: 0
> > > > > > >>      rx_64_or_less_octet_packets: 0
> > > > > > >>      rx_65_to_127_octet_packets: 0
> > > > > > >>      rx_128_to_255_octet_packets: 0
> > > > > > >>      rx_256_to_511_octet_packets: 0
> > > > > > >>      rx_512_to_1023_octet_packets: 0
> > > > > > >>      rx_1024_to_1522_octet_packets: 0
> > > > > > >>      rx_1523_to_2047_octet_packets: 0
> > > > > > >>      rx_2048_to_4095_octet_packets: 0
> > > > > > >>      rx_4096_to_8191_octet_packets: 0
> > > > > > >>      rx_8192_to_9022_octet_packets: 0
> > > > > > >>      rx_discards: 304
> > > > > > >>      rx_errors: 0
> > > > > > >>      rx_threshold_hit: 0
> > > > > > >>
> > > > > > >> The above on last night pull from Linux (so 2.6.33+).
> > > > > > >>
> > > > > > >> Everything works fine if I use wireless or another wired card
> > > > > > >> (Realtek in cardbus slot):
> > > > > > >>
> > > > > > >> [root@...r-d630 ~]# lspci | grep -ri net
> > > > > > >> 04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
> > > > > > >> RTL-8139/8139C/8139C+ (rev 10)
> > > > > > >> 09:00.0 Ethernet controller: Broadcom Corporation NetXtreme
> > > > > > >> BCM5755M Gigabit Ethernet PCI Express (rev 02)
> > > > > > >> 0c:00.0 Network controller: Intel Corporation PRO/Wireless
> > > > > > >> 3945ABG [Golan] Network Connection (rev 02)
> > > > > > >>
> > > > > > >> [root@...r-d630 ~]# ethtool eth0
> > > > > > >> Settings for eth0:
> > > > > > >>         Supported ports: [ TP ]
> > > > > > >>         Supported link modes:   10baseT/Half 10baseT/Full
> > > > > > >>                                 100baseT/Half 100baseT/Full
> > > > > > >>                                 1000baseT/Half 1000baseT/Full
> > > > > > >>         Supports auto-negotiation: Yes
> > > > > > >>         Advertised link modes:  10baseT/Half 10baseT/Full
> > > > > > >>                                 100baseT/Half 100baseT/Full
> > > > > > >>                                 1000baseT/Half 1000baseT/Full
> > > > > > >>         Advertised auto-negotiation: Yes
> > > > > > >>         Speed: 1000Mb/s
> > > > > > >>         Duplex: Full
> > > > > > >>         Port: Twisted Pair
> > > > > > >>         PHYAD: 1
> > > > > > >>         Transceiver: internal
> > > > > > >>         Auto-negotiation: on
> > > > > > >>         Supports Wake-on: g
> > > > > > >>         Wake-on: g
> > > > > > >>         Current message level: 0x000000ff (255)
> > > > > > >>         Link detected: yes
> > > > > > >>
> > > > > > >> Any ideas? Thanks!
> > > > > >
> > > > > > My laptop is a D630, and running 2.6.33-rc3 with no special
> > > > > > problems on tg3
> > > > >
> > > > > This is wierd... It all works well with Fedora 12 kernel and .32 so
> > > > > hardware is fine here. I think it also worked when I plugged it
> > > > > into my home router (will try it again tonight). But in the office
> > > > > it just does not want to work. It's like it just does not like the
> > > > > addresses that we use here...
> > > >
> > > > Is the problem related to link speed?  I see that Eric was running at
> > > > 100Mbps.  Your ethtool output above shows that you are running at
> > > > 1Gbps.
> > >
> > > Indeed I have 100Mbps at home and 1Gb in the office.. I amy try playing
> > > with it some more if you want but that patch you sent seems to have
> > > fixed the issue for me...
> > >
> > > Except that sice I started using tg3 in couple of hours the box locked
> > > up completely once and panicked twice; of course it happened in X so no
> > > traces whatsoever. Maybe a coincidence though, I am running with nvidia
> > > driver...
> >
> > No, something is definitely going on. I can work for a long time using
> > the Realtek card but if I switch to tg3 then pretty quickly network gets
> > stuck again and in a minute or so the box panics. Last time that
> > happened I switched to the text console and managed to captute an oops
> > (attached) but there is nothing really conclusive there...
> >
> > Thanks.
> 
> I looked over all the patches I submitted between tg3 versions 3.102
> and 3.105.  Long story short, I didn't see anything particularly
> suspicious.
> 
> Could you try dropping in the tg3.c and tg3.h from the 2.6.32 kernel
> into your 2.6.33 source tree and see if you encounter the same problem?
> 

skb_dma_map/unmap are gone from 2.6.33 so direct drop does not work :(

-- 
Dmitry
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