Hi tech@, Calculating the IP header checksum on Realtek 8168 is broken when the packet has IP options.
FreeBSD mentions only the 8168C and 8168C_SPIN2 but the 8168CP is the one we have. http://svnweb.freebsd.org/base/stable/8/sys/dev/re/if_re.c?r1=219112&r2=219114 Solution is to disable IP checksum offloading. ok? bluhm Index: dev/ic/re.c =================================================================== RCS file: /mount/cvsdev/cvs/openbsd/src/sys/dev/ic/re.c,v retrieving revision 1.139 diff -u -p -r1.139 re.c --- dev/ic/re.c 9 May 2012 13:30:12 -0000 1.139 +++ dev/ic/re.c 1 Mar 2013 18:22:30 -0000 @@ -1139,8 +1139,21 @@ re_attach(struct rl_softc *sc, const cha m_clsetwms(ifp, MCLBYTES, 2, RL_RX_DESC_CNT); - ifp->if_capabilities = IFCAP_VLAN_MTU | IFCAP_CSUM_IPv4 | - IFCAP_CSUM_TCPv4 | IFCAP_CSUM_UDPv4; + /* + * RTL8168/8111C generates wrong IP checksummed frame if the + * packet has IP options so disable TX IP checksum offloading. + */ + switch (sc->sc_hwrev) { + case RL_HWREV_8168C: + case RL_HWREV_8168C_SPIN2: + case RL_HWREV_8168CP: + ifp->if_capabilities = IFCAP_VLAN_MTU | + IFCAP_CSUM_TCPv4 | IFCAP_CSUM_UDPv4; + break; + default: + ifp->if_capabilities = IFCAP_VLAN_MTU | IFCAP_CSUM_IPv4 | + IFCAP_CSUM_TCPv4 | IFCAP_CSUM_UDPv4; + } #if NVLAN > 0 ifp->if_capabilities |= IFCAP_VLAN_HWTAGGING;
