[Discuss-gnuradio] USRP2 eth link issues

[Ricky A. Melgares]

Hello,

I recently starting having ethernet connectivity issues with our USRP2.  Whenever I run "find_usrps", I get a no USRP2 found message. The USRP2 worked perfectly before without any issues on a Thinkpad T410 running Ubuntu 10.10 with a repo install of gnuradio, along with the latest corresponding FPGA and firmware (XCVR2450) images. I figured that the gnuradio environment had somehow become broken, so I decided to do a clean install of gnuradio and the corresponding packages/dependencies from repo (as well as reflashing the FPGA and firmware images on the old and a new SD card) on a new system to no avail. I next tried every suggestion I could find on the mailing list and forums. This included making sure that my network-manager and firewall were disabled, using ethtool to turn rx on, setting up networking according to the UHD - USRP2 and N Serial Application Notes (as well as using the USRP2 recovery tool to set the USRP2's IP address), monitoring my ethernet interface with tcpdump and Wireshark, and disconnecting the daughterboard card, all to no avail. 

When monitoring the network interface, I sometimes see the broadcast packet(s) sent by find_usrps, and very rarely actually get a response. When I do get a response, the connection seems to die immediately after, as find_usrps is unable to find the USRP2 when I ran again. All the lights on the front blink upon power up, LEDs D and F remain on afterward, I am using a gigabit interface and cable, and the fuse is okay. USRP2 and system/package info is listed below, as well as the output from serial and ethtool. The output from serial is most interesting, because the eth link speed changes to 1000 and then to 0 immediately after roughly every 3 seconds. Running find_usrps immediately (like a split second after, almost simultaneously) and only after the eth link speed changes to 1000 yields a proper response from the USRP2 momentarily.

Has anyone seen this behavior before or have any other suggestions?

--Ricky

USRP2 Rev 4.0

XCVR2450 (Rev 753)

$ cat /etc/issue

Ubuntu 10.10 \n \l

$ uname -a

Linux gares-e5400 2.6.35-27-generic #48-Ubuntu SMP Tue Feb 22 20:25:29 UTC 2011 i686 GNU/Linux

$ dpkg -s gnuradio

Package: gnuradio

Status: install ok installed

Priority: optional

Section: comm

Installed-Size: 40

Maintainer: Ubuntu Developers <address@hidden>

Architecture: all

Version: 3.2.2.dfsg-1ubuntu3

Recommends: libgnuradio, libgnuradio-dev, gnuradio-doc, python-gnuradio, gnuradio-utils, gnuradio-examples, gnuradio-apps

Description: The GNU Software Radio Toolkit

 This is a virtual package that installs the entire GNU Radio and USRP software

 set.

Original-Maintainer: Bdale Garbee <address@hidden>

------------------

find_usrps output (when it actually works, which is very rarely)

$ find_usrps

00:50:c2:85:32:c3 hw_rev = 0x0400

------------------

ethtool output

$ sudo 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 pause frame use: No

Advertised auto-negotiation: Yes

Speed: 1000Mb/s

Duplex: Full

Port: Twisted Pair

PHYAD: 1

Transceiver: internal

Auto-negotiation: on

MDI-X: Unknown

Supports Wake-on: g

Wake-on: g

Current message level: 0x000000ff (255)

Link detected: yes

------------------

Serial output (after running "sudo ethtool -A eth0 rx on," otherwise ethernet flow control set to none)

$ screen /dev/tty.usbserial-A700eBUj 230400

TX dbid: 0x60

Rx dbid: 0x61

TxRx-NEWETH

00:50:C2:85:32:C3

ethernet flow control: WE_TX

Speed set to 1000

eth link changed: speed = 1000

eth link changed: speed = 0

ethernet flow control: WE_TX

Speed set to 1000

eth link changed: speed = 1000

eth link changed: speed = 0

ethernet flow control: WE_TX

Speed set to 1000

eth link changed: speed = 1000

eth link changed: speed = 0

ethernet flow control: WE_TX

Speed set to 1000

eth link changed: speed = 1000

eth link changed: speed = 0

ethernet flow control: WE_TX

Speed set to 1000

eth link changed: speed = 1000

eth link changed: speed = 0

ethernet flow control: WE_TX

Speed set to 1000

eth link changed: speed = 1000

eth link changed: speed = 0

ethernet flow control: WE_TX

Speed set to 1000

eth link changed: speed = 1000

eth link changed: speed = 0

.... the eth link speed continuos to alternate indefinitely, and every 3 seconds the eth link speed changes to 1000, and then to 0 immediately after

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