Arnaud Houdelette
2008-Mar-02 22:44 UTC
IP header checksum missing with Realtek 8168, jumbo frames and offloading.
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
Pyun YongHyeon
2008-Mar-03 00:43 UTC
IP header checksum missing with Realtek 8168, jumbo frames and offloading.
On Sun, Mar 02, 2008 at 11:44:03PM +0100, Arnaud Houdelette wrote: > 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) ? > There had been several re(4) instability issues on PCIe based controllers. Would you try the following patch and let me know the result? http://people.freebsd.org/~yongari/re/6.3R/re.busdma.patch If you use 7.0-RELEASE use the following one. http://people.freebsd.org/~yongari/re/7.0R/if_re.c http://people.freebsd.org/~yongari/re/7.0R/if_rlreg.h > 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 -- Regards, Pyun YongHyeon