It looks like the packet length and data length are set properly. According to my log data I have two fragments:
#1 fragment pkt_len=1518, 2 segments: data_len=38 and data_len=1480 #2 fragment pkt_len=1066, 2 segments: data_len=38 and data_len=1028 For each fragment sum of the data lengths of all segmens equal to the pkt_len value. 2016-08-12 20:44 GMT+03:00 Matt Laswell <laswell at infinite.io>: > I've found that if both the packet length and data length fields in an > mbuf aren't set properly, DPDK will quietly drop it on the floor when I try > to send it. I don't know if that's the cause of your problems, but it's > one of the first places that I would look. > > -- > Matt Laswell > Principal Software Engineer, infinite io > laswell at infinite.io > > > On Fri, Aug 12, 2016 at 12:32 PM, ????????? ??????? <kiselev99 at gmail.com> > wrote: > >> Hi! >> >> I am trying to use rte_ipv4_fragment_packet() function, but so far all >> attemps has been unsuccessful. >> >> Fragment function gets a packet, successfuly splits it to the two packets, >> then I add an L2 header to the each of resulting fragments >> and send the fragments using rte_eth_tx_burst() to the wire. All steps of >> the above process are succesfully completed without any error, but I don't >> see the fragments on the wire and PMD stat function also reports that no >> packets were transmitted. >> >> I've rechecked many times that L2 header of each fragments is correct, >> that >> values of l2_len and l3_len rte_mbuf members are correct, >> that the rte_eth_tx_burst() result is correct (2 packets). The sizes of >> fragments are also correct. >> >> What did I miss? >> >> I am using DPDK 2.2.0 and ixgbe PMD driver. >> >> This is some log data of a test run. >> == >> == >> The original packet that has to be fragmented (including L2 header data) >> >> dump mbuf at 0x0x7f7d103870c0, phys=215787140, buf_len=2176 >> pkt_len=2546, ol_flags=40000000000003, nb_segs=2, in_port=0 >> segment at 0x0x7f7d103870c0, data=0x0x7f7d103871c0, data_len=1518 >> Dump data at [0x7f7d103871c0], len=50 >> 00000000: 00 1B 21 3C 69 45 90 E2 BA 00 3C CC 81 00 00 86 | >> ..!<iE....<..... >> 00000010: 08 00 45 00 09 E0 7E D1 00 00 40 01 00 00 C0 A8 | >> ..E...~... at ..... >> 00000020: 7D 01 C0 A8 7D 02 00 00 FD FD 0B 2D 00 01 56 FF | >> }...}......-..V. >> 00000030: AD 57 | | | | | | | | | | | | | | | .W >> segment at 0x0x7f7d10386780, data=0x0x7f7d103868a6, data_len=1028 >> >> >> fragmentation is needed. mtu 1500, pkt len 2546, data len 1518, l2 len 18, >> l3 len 20 >> num fragment needed: 2 >> >> == >> == >> Fragments (including L2 header data): >> >> fragment #0, pkt len 1518, l2 len 18, l3 len 20, data len 38 >> >> dump mbuf at 0x0x7f7d10388340, phys=2157883c0, buf_len=2176 >> pkt_len=1518, ol_flags=40000000000000, nb_segs=2, in_port=255 >> segment at 0x0x7f7d10388340, data=0x0x7f7d1038842e, data_len=38 >> Dump data at [0x7f7d1038842e], len=38 >> 00000000: 00 1B 21 3C 69 45 90 E2 BA 00 3C CC 81 00 00 86 | >> ..!<iE....<..... >> 00000010: 08 00 45 00 05 DC 7E D1 20 00 40 01 00 00 C0 A8 | ..E...~. >> . at ..... >> 00000020: 7D 01 C0 A8 7D 02 | | | | | | | | | | | }...}. >> segment at 0x0x7f7d0ef87dc0, data=0x0x7f7d103871e6, data_len=1480 >> Dump data at [0x7f7d103871e6], len=12 >> 00000000: 00 00 FD FD 0B 2D 00 01 56 FF AD 57 | | | | | .....-..V..W >> >> >> fragment #1, pkt len 1066, l2 len 18, l3 len 20, data len 38 >> >> dump mbuf at 0x0x7f7d10388c80, phys=215788d00, buf_len=2176 >> pkt_len=1066, ol_flags=40000000000000, nb_segs=2, in_port=255 >> segment at 0x0x7f7d10388c80, data=0x0x7f7d10388d6e, data_len=38 >> Dump data at [0x7f7d10388d6e], len=38 >> 00000000: 00 1B 21 3C 69 45 90 E2 BA 00 3C CC 81 00 00 86 | >> ..!<iE....<..... >> 00000010: 08 00 45 00 04 18 7E D1 00 B9 40 01 00 00 C0 A8 | >> ..E...~... at ..... >> 00000020: 7D 01 C0 A8 7D 02 | | | | | | | | | | | }...}. >> segment at 0x0x7f7d0ef87480, data=0x0x7f7d103868a6, data_len=1028 >> Dump data at [0x7f7d103868a6], len=12 >> 00000000: C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB | | | | | ............ >> lcore 1 SEND >> >> == >> == >> sending 2 packets >> sending result: 2 >> >> >> -- >> -- >> Kiselev Alexander >> > > -- -- Kiselev Alexander
