Date: Sun, 02 Mar 2008 23:44:03 +0100 From: Arnaud Houdelette <arnaud.houdelette@tzim.net> To: freebsd-stable@freebsd.org Subject: IP header checksum missing with Realtek 8168, jumbo frames and offloading. Message-ID: <47CB2DB3.5010707@tzim.net>
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I encountered connectivity issues with an integrated Realtek 8168 on my MSI motherboard after enabling jumbo frames on my other box. Investigating the issue, I found that the packets with an ethernet frame of length > 2048 get an IP header of 0x0000. ping -s 3000 192.168.0.11 ==> fail (ethereal on the other box show the 0x0000 checksum on IP header) ping -s 2008 192.168.0.11 ==> fail ping -s 2006 192.168.0.11 ==> succeed re0: <RealTek 8168/8111B PCIe Gigabit Ethernet> port 0xd800-0xd8ff mem 0xfeaff000-0xfeafffff irq 19 at device 0.0 on pci2 re0: Using 2 MSI messages miibus0: <MII bus> on re0 rgephy0: <RTL8169S/8110S/8211B media interface> PHY 1 on miibus0 rgephy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto The interface re0 is configured with : ifconfig inet 192.168.0.1/24 media auto mtu 7422 polling ifconfig re0 -txcsum solves the issue. I tried to reproduce the issue with a Realtek 8169 (using re(4) too). I couln't : checksum offloading works ok on this card. Is this a known issue (or maybe a bug in the 8168) ? I can provide some network capture if needed. In the meantime I swapped the two cards as I don't need jumbo on one of them. Thanks Arnaud
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