fxp(4) checksum (offloading?) errors

[Cédric Jonas]

Hi,

I get TCP/UDP checksum errors with fxp(4). I noticed it after using
Wireshark today:

	Checksum: 0xac18 [incorrect, should be 0xfbc7 (maybe caused by
	checksum offloading?)]

for example.

If I understand it more or less correctly, checksum offloading is
performed by or with help of the NIC - only for TCP and UDP, where the
checksum fails exactly...
I didn't found a way to disable it, so I assume it's a bug in the
driver... I don't know exactly which infos I must provide additionally
to the following, so don't hesitate to ask more :)

Used NIC:

	fxp0: <Intel 82550 Pro/100 Ethernet> port 0xa400-0xa43f mem
	0xfb030000-0xfb030fff,0xfb000000-0xfb01ffff irq 16 at device
	7.0 on pci2

Used system:

	FreeBSD ganymed 7.0-CURRENT FreeBSD 7.0-CURRENT #0: Sun Jan 21
	16:07:51 CET 2007
	root at ganymed:/usr/obj/usr/src/sys/GANYMED  i386


-- 
Cédric Jonas                                        cedric at decemplex.net

GPG ID:                                                         30CCFE8D
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Jabber-ID:                                          cedric at decemplex.net
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