Looks to me like it’s IPv4 fragmentation that fails, not reassembly. Currently fragmentation on buffer chains isn’t supported. Try this patch for an ugly hack: https://gerrit.fd.io/r/#/c/13918/
Cheers, Ole > On 6 Aug 2018, at 08:34, Ni, Hongjun <hongjun...@intel.com> wrote: > > Hi all, > > We performed below test on VPP 18.07, and it seems that IP reassembly doesn't > work in VPP 18.07. > > Below is the test topology: > Machine A is the VPP DUT, while machine B is just a standard Linux server. > Network topology: Machine A (VPP) <----> Machine B ; And set both MTU to 1500 > Issue: “ping A_ip -s 2000” at B doesn’t get reply from A; While from VPP (A), > “ping B_ip size 1900” does. > > Could you help to take a look at this issue? Thanks a lot. > > Below is the configuration and packet trace: > VPP CLI: > set interface state TenGigabitEthernetaf/0/1 up > set interface ip address TenGigabitEthernetaf/0/1 10.1.1.2/24 > set interface mtu 1500 TenGigabitEthernetaf/0/1 > set interface reassembly TenGigabitEthernetaf/0/1 on > vpp# show errors > 314 ip4-frag malformed packet > Vpp# show trace > Packet 1 > > 00:04:02:492398: dpdk-input > TenGigabitEthernetaf/0/1 rx queue 0 > buffer 0x2556: current data 14, length 1500, free-list 0, clone-count 0, > totlen-nifb 0, trace 0x0 > ext-hdr-valid > l4-cksum-computed l4-cksum-correct l2-hdr-offset 0 > PKT MBUF: port 0, nb_segs 1, pkt_len 1514 > buf_len 2176, data_len 1514, ol_flags 0x180, data_off 128, phys_addr > 0x80095600 > packet_type 0x391 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0 > rss 0x0 fdir.hi 0x0 fdir.lo 0x0 > Packet Offload Flags > PKT_RX_IP_CKSUM_GOOD (0x0080) IP cksum of RX pkt. is valid > PKT_RX_L4_CKSUM_GOOD (0x0100) L4 cksum of RX pkt. is valid > Packet Types > RTE_PTYPE_L2_ETHER (0x0001) Ethernet packet > RTE_PTYPE_L3_IPV4_EXT_UNKNOWN (0x0090) IPv4 packet with or without > extension headers > RTE_PTYPE_L4_FRAG (0x0300) Fragmented IP packet > IP4: 68:05:ca:3a:19:18 -> 3c:fd:fe:a9:cc:ed > ICMP: 10.1.1.1 -> 10.1.1.2 > tos 0x00, ttl 64, length 1500, checksum 0x2eb6 > fragment id 0x1067, flags MORE_FRAGMENTS > ICMP echo_request checksum 0x496a > 00:04:02:492403: ip4-input-no-checksum > ICMP: 10.1.1.1 -> 10.1.1.2 > tos 0x00, ttl 64, length 1500, checksum 0x2eb6 > fragment id 0x1067, flags MORE_FRAGMENTS > ICMP echo_request checksum 0x496a > 00:04:02:492406: ip4-reassembly-feature > reass id: 1000000118, op id: 0 first bi: 9558, data len: 1480, > ip/fragment[0, 1479] > new range: [0, 1479], off 0, len 1480, bi > 9558 > reass id: 1000000118, op id: 2 first bi: 9558, data len: 2008, > ip/fragment[0, 1479] > finalize reassembly > 00:04:02:492434: ip4-lookup > fib 0 dpo-idx 5 flow hash: 0x00000000 > ICMP: 10.1.1.1 -> 10.1.1.2 > tos 0x00, ttl 64, length 2028, checksum 0x4ca6 > fragment id 0x1067 > ICMP echo_request checksum 0x496a > 00:04:02:492435: ip4-local > ICMP: 10.1.1.1 -> 10.1.1.2 > tos 0x00, ttl 64, length 2028, checksum 0x4ca6 > fragment id 0x1067 > ICMP echo_request checksum 0x496a > 00:04:02:492436: ip4-icmp-input > ICMP: 10.1.1.1 -> 10.1.1.2 > tos 0x00, ttl 64, length 2028, checksum 0x4ca6 > fragment id 0x1067 > ICMP echo_request checksum 0x496a > 00:04:02:492436: ip4-icmp-echo-request > ICMP: 10.1.1.1 -> 10.1.1.2 > tos 0x00, ttl 64, length 2028, checksum 0x4ca6 > fragment id 0x1067 > ICMP echo_request checksum 0x496a > 00:04:02:492436: ip4-load-balance > fib 0 dpo-idx 13 flow hash: 0x00000000 > ICMP: 10.1.1.2 -> 10.1.1.1 > tos 0x00, ttl 64, length 2028, checksum 0x2d49 > fragment id 0x2fc4 > ICMP echo_reply checksum 0x516a > 00:04:02:492436: ip4-rewrite > tx_sw_if_index 0 dpo-idx 1 : ipv4 via 10.1.1.1 TenGigabitEthernetaf/0/1: > mtu:1500 6805ca3a19183cfdfea9cced0800 flow hash: 0x05dc0000 > 00000000: 450007ec2fc4000040012d490a0101020a0101010000516a3ef600723f805a48 > 00000020: 00000000bd7c0c0000000000101112131415161718191a1b1c1d1e1f > 00:04:02:492436: ip4-frag > IPv4 offset: 0 mtu: 1500 fragments: 1 > 00:04:02:492437: ip4-drop > ICMP: 10.1.1.2 -> 10.1.1.1 > tos 0x00, ttl 64, length 2028, checksum 0x2d49 > fragment id 0x2fc4 > ICMP echo_reply checksum 0x516a > 00:04:02:492437: error-drop > ip4-frag: malformed packet > > Thanks, > Hongjun > > -=-=-=-=-=-=-=-=-=-=-=- > Links: You receive all messages sent to this group. > > View/Reply Online (#10040): https://lists.fd.io/g/vpp-dev/message/10040 > Mute This Topic: https://lists.fd.io/mt/24206662/675193 > Group Owner: vpp-dev+ow...@lists.fd.io > Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub [otr...@employees.org] > -=-=-=-=-=-=-=-=-=-=-=-
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