netdev - BUG: NIU driver: strange issues with multicast "UDP: short packet"

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Date:	Tue, 03 Feb 2009 14:38:20 +0100
From:	Jesper Dangaard Brouer <jdb@...x.dk>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: BUG: NIU driver: strange issues with multicast "UDP: short packet"


I have this strange issues with multicast and the NIU driver (Sun
neptune Quad NIC).  When receiving multicast traffic the kernel log
spams with something like this:

  __ratelimit: 5071 callbacks suppressed
  UDP: short packet: From 81.161.2.106:0 44063/1324 to 233.123.173.7:0
  UDP: short packet: From 81.161.2.106:0 44063/1324 to 233.123.173.7:0
  UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931
  UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931
  UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931
  UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931
  UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931
  UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931
  UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931
  UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931
  __ratelimit: 3555 callbacks suppressed
  UDP: short packet: From 81.161.2.106:0 49320/1324 to 233.123.173.7:0
  UDP: short packet: From 81.161.2.106:0 49320/1324 to 233.123.173.7:0
  UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931
  UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931
  UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931

Tcpdumping the packets, the contents of the packets are correct.

The next strange thing is that I can make the log messages go away, if I
setup a static multicast route out another interface.

  smcroute -a eth52 81.161.2.106 233.123.173.7 eth21

Any hints whats going wrong?

-- 
Med venlig hilsen / Best regards
  Jesper Brouer
  ComX Networks A/S
  Linux Network developer
  Cand. Scient Datalog / MSc.
  Author of http://adsl-optimizer.dk
  LinkedIn: http://www.linkedin.com/in/brouer
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