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Date: Sat, 17 Jul 2004 14:07:20 +0200
From: Marian Durkovic <md@bts.sk>
To: freebsd-net@freebsd.org
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Subject: Driver bge - broken jumbo frame support
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Hi all,

   seems the jumbo frame support in bge driver for FreeBSD 4.10 is broken.
With MTU set to 9000 bytes, the following happens (ping from other machine
towards box with BCM5702):

ping -s 8970 ...  works fine (this generates packets 8998 bytes long)
ping -s 8974 ...  works fine (this generates 2 fragments: 8192 + 790 bytes) 

however

ping -s 8972    generates packets 9000 bytes long - this freezes the card 
                completely (watchdog timeout restarts it).

This means, that the driver is not able to receive full sized jumbo packet
(9000 bytes long), only packet 2 bytes shorter (8998 bytes long). The
problem is present in the RX path, since the bge driver is able to send
out 9000 bytes long packet and receive reply fragments without problem.

Here's the dmesg output:

bge0: <Broadcom BCM5702 Gigabit Ethernet, ASIC rev. 0x1002> mem
0xf9800000-0xf980ffff irq 10 at device 9.0 on pci0
....
bge0: watchdog timeout -- resetting
bge0: gigabit link up

    
	Thanks in advance for any help.      


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----                                                                  ----
----   Marian Durkovic                       network  manager         ----
----                                                                  ----
----   Slovak Technical University           Tel: +421 2 524 51 301   ----
----   Computer Centre, Nam. Slobody 17      Fax: +421 2 524 94 351   ----
----   812 43 Bratislava, Slovak Republic    E-mail/sip: md@bts.sk    ----
----                                                                  ----
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