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Date: Fri, 12 Aug 2016 20:32:26 +0300
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Subject: [dpdk-users] ipv4 fragmentation
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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...~...@.....
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...~. .@.....
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...~...@.....
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