MOZGIII:

Forum link: https://forum.openwrt.org/t/flow-offloading-1-is-broken-on-latest-snapshot-4-19-issue/40392

blubbblubb:

I noticed the same behavior. A custom build with 4.14 works for me as well.
(The old ar71 snapshots work as well)

avbohemen:

If I run the above commands on my system (also Archer C7v2, kernel 4.14, build r9136-f4d6e8f98f) I get a lot more output:

root@router ~# lsmod|grep -i flow
cls_flow 5680 0
nf_conntrack 63649 45 nf_nat_pptp,nf_conntrack_pptp,nf_conntrack_ipv6,ipt_MASQUERADE,xt_state,xt_nat,xt_helper,xt_conntrack,xt_connmark,xt_connlimit,xt_connbytes,xt_REDIRECT,xt_CT,nft_redir_ipv4,nft_redir,nft_nat,nft_masq_ipv4,nft_masq,nft_flow_offload,nft_ct,nf_nat_tftp,nf_nat_snmp_basic,nf_nat_sip,nf_nat_masquerade_ipv4,nf_nat_irc,nf_conntrack_ipv4,nf_nat_ipv4,nf_nat_h323,nf_nat_ftp,nf_nat_amanda,nf_nat,nf_flow_table,nf_conntrack_tftp,nf_conntrack_snmp,nf_conntrack_sip,nf_conntrack_rtcache,nf_conntrack_proto_gre,nf_conntrack_netlink,nf_conntrack_irc,nf_conntrack_h323,nf_conntrack_ftp,nf_conntrack_broadcast,nf_conntrack_amanda,sch_cake,act_connmark
nf_flow_table 14015 6 nf_flow_table_ipv6,nf_flow_table_ipv4,nf_flow_table_inet,xt_FLOWOFFLOAD,nft_flow_offload,nf_flow_table_hw
nf_flow_table_hw 2160 1
nf_flow_table_inet 528 0
nf_flow_table_ipv4 464 0
nf_flow_table_ipv6 464 0
nf_tables 68745 29 nf_flow_table_ipv6,nf_flow_table_ipv4,nf_flow_table_inet,nft_set_rbtree,nft_set_hash,nft_reject_ipv6,nft_reject_ipv4,nft_reject_inet,nft_reject,nft_redir_ipv4,nft_redir,nft_quota,nft_numgen,nft_nat,nft_meta,nft_masq_ipv4,nft_masq,nft_log,nft_limit,nft_flow_offload,nft_exthdr,nft_ct,nft_counter,nft_chain_route_ipv6,nft_chain_route_ipv4,nft_chain_nat_ipv4,nf_tables_ipv6,nf_tables_ipv4,nf_tables_inet
nft_flow_offload 1584 0
x_tables 13807 45 ipt_REJECT,ipt_MASQUERADE,xt_time,xt_tcpudp,xt_tcpmss,xt_statistic,xt_state,xt_recent,xt_policy,xt_nat,xt_multiport,xt_mark,xt_mac,xt_limit,xt_length,xt_hl,xt_helper,xt_esp,xt_ecn,xt_dscp,xt_conntrack,xt_connmark,xt_connlimit,xt_connbytes,xt_comment,xt_TCPMSS,xt_REDIRECT,xt_LOG,xt_HL,xt_FLOWOFFLOAD,xt_DSCP,xt_CT,xt_CLASSIFY,iptable_raw,iptable_mangle,iptable_filter,ipt_ah,ipt_ECN,ip_tables,act_ipt,xt_set,ip6t_REJECT,ip6table_mangle,ip6table_filter,ip6_tables
xt_FLOWOFFLOAD 2848 2
root@router ~# iptables -L| grep -i off
FLOWOFFLOAD all -- anywhere anywhere /* !fw3: Traffic offloading */ ctstate RELATED,ESTABLISHED FLOWOFFLOAD

psyborg:

the problem starts with kernel 4.19.26, upstream change that broke flow offload: Upstream commit 10f4e765879e514e1ce7f52ed26603047af196e2

netfilter: nft_flow_offload: fix interaction with vrf slave device

MOZGIII:

I created a kernel bug some time ago for the related issue: https://bugzilla.kernel.org/show_bug.cgi?id=204507
Would be great if people with more OpenWRT development experience participated there, as my knowledge might not be enough to properly assist.