Date: Tue, 16 Oct 2007 12:22:23 +0200 From: Jelte Jansen <jelte@NLnetLabs.nl> To: freebsd-current@freebsd.org Subject: re(4) checksum offload problem Message-ID: <471490DF.7010609@NLnetLabs.nl>
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Hi,
i'm seeing bad IP/UDP checksums on packets on a realtek gigabit network
card. Turning offloading off (ifconfig -txcsum) seems to make the
problem disappear.
Attached are pcap files showing the bad checksums; the IP header is set
to 0x0000 and then TCP/UDP headers are wrong too. The machine in
question is on .99. These were taken on the host itself but i also see
them on the other machine.
pciconf:
re0@pci0:1:8:0: class=0x020000 card=0xee221113 chip=0x816910ec rev=0x10
hdr=0x00
vendor = 'Realtek Semiconductor'
device = 'RTL8110SB Single-Chip Gigabit LOM Ethernet Controller'
class = network
subclass = ethernet
Version:
$FreeBSD: src/sys/dev/re/if_re.c,v 1.95 2007/08/14 02:00:04 yongari E\
xp $
Jelte
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name="without_offload.pcap"
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1MOyoQIABAAAAAAAAAAAAGAAAAABAAAAMHcURzCRCgBcAAAAXAAAAAAT9wvmbgAOLnBjwwgA
RQAATlWQAABAARkKwKhFY8CoRWEIAGOZV2sAAEcUdzAACjBJCAkKCwwNDg8QERITFBUWFxgZ
GhscHR4fICEiIyQlJicoKSorLC0uLzAxMHcUR0ORCgBcAAAAXAAAAAAOLnBjwwAT9wvmbggA
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GhscHR4fICEiIyQlJicoKSorLC0uLzAxNXcUR/EuCgBDAAAAQwAAAAAT9wvmbgAOLnBjwwgA
RQAANVWRAABAERkSwKhFY8CoRWHT2gA1ACERLr8BAQAAAQAAAAAAAAR0ZXN0Am5sAAABAAE1
dxRHLjAKAGAAAACVAQAAAA4ucGPDABP3C+ZuCABFAAGHDRQAAEARYD3AqEVhwKhFYwA109oB
c211vwGBAAABAAAABwAJBHRlc3QCbmwAAAEAAcARAAIAAQACowAACgFCA05JQwJGUgDAEQAC
AAEANncUR9TIDgBOAAAATgAAAAAT9wvmbgAOLnBjwwgARRAAQFWSQABABtkAwKhFY8CoRWHk
dwAXWa96JgAAAACwAv//ZMQAAAIEBbQBAwMIAQEICgJ6C0IAAAAABAIAADZ3FEfoyA4ANgAA
ADYAAAAADi5wY8MAE/cL5m4IAEUAACgNFUAAQAYhpsCoRWHAqEVjABfkdwAAAABZr3onUBQA
AOtVAAA=
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1MOyoQIABAAAAAAAAAAAAGAAAAABAAAA1HYUR/LgAgBcAAAAXAAAAAAT9wvmbgAOLnBjwwgA
RQAATlWKAABAARkQwKhFY8CoRWEIACL3SGsAAEcUdtQAAoBPCAkKCwwNDg8QERITFBUWFxgZ
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dhRH2U0JAGAAAACVAQAAAA4ucGPDABP3C+ZuCABFAAGHDQYAAEARAADAqEVhwKhFYwA1/tYB
cw2aBB+BAAABAAAABwAJBHRlc3QCbmwAAAEAAcARAAIAAQACowAAFgNOUzUPRE9NQUlOLVJF
R0lTB3cUR9GICABOAAAATgAAAAAT9wvmbgAOLnBjwwgARRAAQFWMQABABtkGwKhFY8CoRWHI
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AAwwAAA=
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