Pim, Thanks for the reply. I pulled in https://gerrit.fd.io/r/c/vpp/+/31122<https://urldefense.com/v3/__https://gerrit.fd.io/r/c/vpp/*/31122__;Kw!!ACWV5N9M2RV99hQ!cyVTSFNEzYVndco9Q2FNzR7L7kG9EPVImqdNMLQQTqKLS5A1eTzckOmvFR_ajOu2_A$>. Set the default netns in startup.conf. Now it works. tap3 doesn't have the IP address in Linux.
vpp# show int addr host-vpp-veth (up): L3 192.168.3.3/31 ipip0 (up): unnumbered, use tn-eth0 L3 192.168.1.6/24 ipip1 (up): unnumbered, use tn-eth1 L3 192.168.10.6/24 local0 (dn): tap3 (up): tn-eth0 (up): L3 192.168.1.6/24 tn-eth1 (up): L3 192.168.10.6/24 tn-eth2 (up): L3 192.168.100.5/24 Wei ________________________________ From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> on behalf of Pim van Pelt <p...@ipng.nl> Sent: Thursday, February 24, 2022 5:17 AM To: Wei Huang <wei.hu.hu...@oracle.com> Cc: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> Subject: [External] : Re: [vpp-dev] linux-cp created tap interface send out packets issue Wei, I think Linux CP starts a netlink listener in what is configured as the default netns (in your case, <unset> implies this is the default namespace). This means any 'ip' command you issue from Linux side won't be seen by VPP. A few comments: - You are running 21.06 which is not complete. Please build from HEAD or use the 22.02 release that was published this week. - We merged a more (but not yet fully) complete Linux CP in https://gerrit.fd.io/r/c/vpp/+/31122<https://urldefense.com/v3/__https://gerrit.fd.io/r/c/vpp/*/31122__;Kw!!ACWV5N9M2RV99hQ!cyVTSFNEzYVndco9Q2FNzR7L7kG9EPVImqdNMLQQTqKLS5A1eTzckOmvFR_ajOu2_A$> for 22.02 release - The current implementation can only service linux interfaces in one (1) network namespace - I recommend you actually do set the default namespace /before/ creating your first LIP; either in startup.conf under linux-cp { default netns inline_mgt_net }; or on the CLI with lcp default netns inline_mgmt_net. Can you share as well 'show int addr' to see if the IP address you set on the Linux side, made its way into the VPP dataplane ? groet, Pim On Thu, Feb 24, 2022 at 2:49 AM Wei Huang <wei.hu.hu...@oracle.com<mailto:wei.hu.hu...@oracle.com>> wrote: I am using VPP v21.06. Enabled linux-cp plugin. Created lcp as follows: vppctl lcp create tn-eth2 host-if vpp2 netns inline_mgt_net vppctl ip mroute add 224.0.0.0/24<https://urldefense.com/v3/__http://224.0.0.0/24__;!!ACWV5N9M2RV99hQ!cyVTSFNEzYVndco9Q2FNzR7L7kG9EPVImqdNMLQQTqKLS5A1eTzckOmvFR9cOFbXAw$> via local Forward vppctl ip mroute add 224.0.0.0/24<https://urldefense.com/v3/__http://224.0.0.0/24__;!!ACWV5N9M2RV99hQ!cyVTSFNEzYVndco9Q2FNzR7L7kG9EPVImqdNMLQQTqKLS5A1eTzckOmvFR9cOFbXAw$> via tn-eth2 Accept Then bring up vpp2 in Linux: ip netns exec inline_mgt_net ip addr add 192.168.100.5/24<https://urldefense.com/v3/__http://192.168.100.5/24__;!!ACWV5N9M2RV99hQ!cyVTSFNEzYVndco9Q2FNzR7L7kG9EPVImqdNMLQQTqKLS5A1eTzckOmvFR89NbEMfw$> dev vpp2 ip netns exec inline_mgt_net ip link set dev vpp2 up When I ping from my host (192.168.100.20) to 192.168.100.5 via tn-eth2, I can see packets get sent out via tap3, but using tshark in Linux trying to see packets on vpp2, I don't see any packets received on vpp2. ifconfig also show vpp2 has no Rx packets: bash-4.2# ip netns exec inline_mgt_net ifconfig lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 1000 (Local Loopback) RX packets 57333 bytes 3304558 (3.1 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 57333 bytes 3304558 (3.1 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 vpp2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 2004 inet 192.168.100.5 netmask 255.255.255.0 broadcast 0.0.0.0 inet6 fe80::f816:3fff:fe3a:2883 prefixlen 64 scopeid 0x20<link> ether fa:16:3f:3a:28:83 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 1 overruns 0 frame 0 TX packets 842 bytes 65492 (63.9 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 Packet trace in VPP: Packet 1 02:16:23:738692: dpdk-input tn-eth2 rx queue 0 buffer 0x9a8d7: current data 0, length 98, buffer-pool 0, ref-count 1, totlen-nifb 0, trace handle 0x0 ext-hdr-valid l4-cksum-computed l4-cksum-correct PKT MBUF: port 2, nb_segs 1, pkt_len 98 buf_len 2176, data_len 98, ol_flags 0x0, data_off 128, phys_addr 0xaaaa3640 packet_type 0x0 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0 rss 0x0 fdir.hi 0x0 fdir.lo 0x0 IP4: fa:16:3f:53:ad:d6 -> fa:16:3f:3a:28:83 ICMP: 192.168.100.20 -> 192.168.100.5 tos 0x00, ttl 64, length 84, checksum 0xf6a3 dscp CS0 ecn NON_ECN fragment id 0xfa9a, flags DONT_FRAGMENT ICMP echo_request checksum 0x9a6a id 15858 02:16:23:738719: ethernet-input frame: flags 0x1, hw-if-index 3, sw-if-index 3 IP4: fa:16:3f:53:ad:d6 -> fa:16:3f:3a:28:83 02:16:23:738730: ip4-input ICMP: 192.168.100.20 -> 192.168.100.5 tos 0x00, ttl 64, length 84, checksum 0xf6a3 dscp CS0 ecn NON_ECN fragment id 0xfa9a, flags DONT_FRAGMENT ICMP echo_request checksum 0x9a6a id 15858 02:16:23:738737: ip4-lookup fib 0 dpo-idx 10 flow hash: 0x00000000 ICMP: 192.168.100.20 -> 192.168.100.5 tos 0x00, ttl 64, length 84, checksum 0xf6a3 dscp CS0 ecn NON_ECN fragment id 0xfa9a, flags DONT_FRAGMENT ICMP echo_request checksum 0x9a6a id 15858 02:16:23:738742: ip4-local ICMP: 192.168.100.20 -> 192.168.100.5 tos 0x00, ttl 64, length 84, checksum 0xf6a3 dscp CS0 ecn NON_ECN fragment id 0xfa9a, flags DONT_FRAGMENT ICMP echo_request checksum 0x9a6a id 15858 02:16:23:738745: ip4-icmp-input ICMP: 192.168.100.20 -> 192.168.100.5 tos 0x00, ttl 64, length 84, checksum 0xf6a3 dscp CS0 ecn NON_ECN fragment id 0xfa9a, flags DONT_FRAGMENT ICMP echo_request checksum 0x9a6a id 15858 02:16:23:738746: ip4-punt ICMP: 192.168.100.20 -> 192.168.100.5 tos 0x00, ttl 64, length 84, checksum 0xf6a3 dscp CS0 ecn NON_ECN fragment id 0xfa9a, flags DONT_FRAGMENT ICMP echo_request checksum 0x9a6a id 15858 02:16:23:738749: ip4-punt-redirect via redirect:0 02:16:23:738751: ip4-dvr-dpo sw_if_index:7 02:16:23:738753: ip4-dvr-reinject sw_if_index:7 02:16:23:738754: tap3-output tap3 qos_class: 0 qos_type : 0 IP4: fa:16:3f:53:ad:d6 -> fa:16:3f:3a:28:83 ICMP: 192.168.100.20 -> 192.168.100.5 tos 0x00, ttl 64, length 84, checksum 0xf6a3 dscp CS0 ecn NON_ECN fragment id 0xfa9a, flags DONT_FRAGMENT ICMP echo_request checksum 0x9a6a id 15858 vpp# show lcp lcp default netns '<unset>' itf-pair: [0] tn-eth2 tap3 vpp2 11 type tap netns inline_mgt_net vpp# show int Name Idx State MTU (L3/IP4/IP6/MPLS) Counter Count host-vpp-veth 4 up 9000/0/0/0 rx packets 318 rx bytes 20450 tx packets 410 tx bytes 26380 drops 3 ip4 181 ip6 2 ipip0 5 up 9000/0/0/0 rx packets 274 rx bytes 26832 ip4 274 ipip1 6 up 9000/0/0/0 tx packets 180 tx bytes 22244 local0 0 down 0/0/0/0 tap3 7 up 9000/0/0/0 rx packets 832 rx bytes 64712 tx packets 7954 tx bytes 766484 drops 7704 ip4 815 ip6 17 tn-eth0 1 up 9000/0/0/0 rx packets 1033 rx bytes 113410 tx packets 748 tx bytes 75784 drops 275 ip4 829 ip6 2 tn-eth1 2 up 9000/0/0/0 rx packets 733 rx bytes 75370 tx packets 910 tx bytes 99792 drops 274 ip4 547 ip6 2 tn-eth2 3 up 9000/0/0/0 rx packets 8183 rx bytes 776322 tx packets 1048 tx bytes 73712 drops 7 ip4 7957 ip6 4 vpp# show error Count Node Reason Severity 1094 ikev2-ip4 processed info 2 ikev2-ip4 ike_sa_init_retransmit info 542 ikev2-ip4 keepalive info 4 ikev2-ip4 rekey_req info 4 ikev2-ip4 init_sa_req info 2 ikev2-ip4 ike_auth_req info 11 dpdk-input no error error 741 arp-reply ARP replies sent error 542 ip4-udp-lookup No error error 274 esp4-decrypt-tun ESP pkts received error 180 esp4-encrypt-tun ESP pkts received error 274 ipsec4-tun-input good packets received error 7 ipsec4-tun-input no matching tunnel error 181 ip4-inacl input ACL misses error 1 ip4-input valid ip4 packets error 3 ip4-input Multicast RPF check failed error 6 ip4-local ip4 spoofed local-address packet dr error 2 ethernet-input no error error 7 punt-dispatch No registrations error 7702 tap3-tx no free tx slots error I don't know if the tap3-tx error "no free tx slots" is the reason why vpp2 not receiving any packets. If it is the cause, how can I fix it? Thanks for your attention. Wei -- Pim van Pelt <p...@ipng.nl<mailto:p...@ipng.nl>> PBVP1-RIPE - http://www.ipng.nl/<https://urldefense.com/v3/__http://www.ipng.nl/__;!!ACWV5N9M2RV99hQ!cyVTSFNEzYVndco9Q2FNzR7L7kG9EPVImqdNMLQQTqKLS5A1eTzckOmvFR_K2BIClw$>
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