Hi, This diff sets needed offloading flags and the calculated mss to LRO mbufs in ix(4). Thus, we can forward this packets and process them via tcp_if_output_tso(). This diff also uses tcp_if_output_tso() in ip6_forward().
I tested the ip6_forward path via the address family transition in pf: pass in inet from 192.168.1.1 to 192.168.13.2 af-to \ inet6 from fc00:13::1 to fc00:13::2 ok? bye, Jan Index: dev/pci/if_ix.c =================================================================== RCS file: /cvs/src/sys/dev/pci/if_ix.c,v retrieving revision 1.196 diff -u -p -r1.196 if_ix.c --- dev/pci/if_ix.c 23 May 2023 09:16:16 -0000 1.196 +++ dev/pci/if_ix.c 23 May 2023 11:02:52 -0000 @@ -3257,13 +3257,38 @@ ixgbe_rxeof(struct rx_ring *rxr) if (sendmp->m_pkthdr.ph_mss > 0) { struct ether_extracted ext; + uint64_t hlen; uint16_t pkts = sendmp->m_pkthdr.ph_mss; + /* Calculate header size. */ ether_extract_headers(sendmp, &ext); - if (ext.tcp) + hlen = sizeof(*ext.eh); + if (ext.ip4) { + hlen += ext.ip4->ip_hl << 2; + } else if (ext.ip6) { + if (ext.ip6->ip6_nxt == IPPROTO_TCP) + hlen += sizeof(*ext.ip6); + else + tcpstat_inc(tcps_inbadlro); + } + if (ext.tcp) { tcpstat_inc(tcps_inhwlro); - else + hlen += ext.tcp->th_off << 2; + } else { tcpstat_inc(tcps_inbadlro); + } + + /* + * If we gonna forward this packet, we have to + * mark it as TSO, recalculate the TCP checksum + * and set a correct mss. + */ + SET(sendmp->m_pkthdr.csum_flags, + M_TCP_CSUM_OUT | M_TCP_TSO); + + sendmp->m_pkthdr.ph_mss = + (sendmp->m_pkthdr.len - hlen) / pkts; + tcpstat_add(tcps_inpktlro, pkts); } Index: netinet6/ip6_forward.c =================================================================== RCS file: /cvs/src/sys/netinet6/ip6_forward.c,v retrieving revision 1.109 diff -u -p -r1.109 ip6_forward.c --- netinet6/ip6_forward.c 5 Apr 2023 13:56:31 -0000 1.109 +++ netinet6/ip6_forward.c 23 May 2023 11:59:19 -0000 @@ -63,8 +63,10 @@ #include <netinet/ip_ah.h> #include <netinet/ip_esp.h> #include <netinet/udp.h> -#include <netinet/tcp.h> #endif +#include <netinet/tcp.h> +#include <netinet/tcp_timer.h> +#include <netinet/tcp_var.h> /* * Forward a packet. If some error occurs return the sender @@ -316,7 +318,11 @@ reroute: goto reroute; } #endif - in6_proto_cksum_out(m, ifp); + + error = tcp_if_output_tso(ifp, &m, sin6tosa(sin6), rt, IFCAP_TSOv6, + ifp->if_mtu); + if (error || m == NULL) + goto freecopy; /* Check the size after pf_test to give pf a chance to refragment. */ if (m->m_pkthdr.len > ifp->if_mtu) { @@ -326,6 +332,8 @@ reroute: m_freem(m); goto out; } + + in6_proto_cksum_out(m, ifp); error = ifp->if_output(ifp, m, sin6tosa(sin6), rt); if (error) {