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+Scapy DPDK extension
+====================
+
+Scapy DPDK extension is a testpmd forwarding engine and a set of command: tx, rx 
+and expect(tx,rx,compare) packet, useful for development, unit test and fast 
+regression.
+
+
+This document introduces basic syntax with examples.
+
+* Scapy usage: http://scapy.readthedocs.io/en/latest/usage.html
+
+Enable python/scapy:
+--------------------------------
+- Remember to install python-libs and scapy using `yum` or `apt`
+- Enable python lib in dpdk configuration, build:
+
+  .. code-block:: c
+ 
+    CONFIG_RTE_LIBRTE_PYTHON=y
+    CONFIG_RTE_LIBRTE_PYTHON_VERSION=python2.7
+
+- Start testpmd in interactive mode
+
+TX - send packet out
+---------------------
+tx <port> <scapy>
+~~~~~~~~~~~~~~~~~
+.. code-block:: c
+
+  # Continuously send simple packet
+  testpmd> tx 0 1
+
+  # Send scapy syntax packet
+  testpmd> tx 0 Ether()/IP()/UDP()/"hello"
+
+  # Flush a subnet
+  testpmd> tx 0 Ether()/IP(dst="192.168.0.1/24")
+  8776640/0 packets sent in 2167534.739us 4.049135mpps
+
+tx <port> <scapy> <count> <verbose>
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. code:: text
+
+  # only send 1
+  testpmd> tx 0 Ether()/IP()/"hello" 1 0
+  1/1 packets sent in 1091.912us 0.000916mpps
+
+  # with simple scapy brief
+  testpmd> tx 0 Ether()/IP()/"hello" 1 0x01
+  Ether / 127.0.0.1 > 127.0.0.1 ip / Raw / Padding
+  1/1 packets sent in 1084.420us 0.000922mpps
+
+  # enum
+  testpmd> tx 0 Ether()/IP()/UDP(sport=[54321,54323]) 2 1
+  Ether / IP / UDP 127.0.0.1:54321 > 127.0.0.1:domain / Padding
+  Ether / IP / UDP 127.0.0.1:54323 > 127.0.0.1:domain / Padding
+
+  # range
+  testpmd> tx 0 Ether()/IP()/UDP(sport=(54321,54323)) 3 1
+  Ether / IP / UDP 127.0.0.1:54321 > 127.0.0.1:domain / Padding
+  Ether / IP / UDP 127.0.0.1:54322 > 127.0.0.1:domain / Padding
+  Ether / IP / UDP 127.0.0.1:54323 > 127.0.0.1:domain / Padding
+
+  # generate flows
+  testpmd> tx 0 Ether()/IP(dst="10.0.0.1/31")/TCP(dport=(55555,55556)) 4 2
+  <Ether  dst=00:00:5e:00:01:19 src=80:18:44:e2:6e:fc type=IPv4 |<IP  ihl=5L len=40 frag=0 proto=tcp chksum=0x990f src=10.12.205.180 dst=10.0.0.0 |<TCP  dport=55555 dataofs=5L chksum=0xd50a |<Padding  load='\x00\x00\x00\x00\x00\x00' |>>>>
+  <Ether  dst=00:00:5e:00:01:19 src=80:18:44:e2:6e:fc type=IPv4 |<IP  ihl=5L len=40 frag=0 proto=tcp chksum=0x990f src=10.12.205.180 dst=10.0.0.0 |<TCP  dport=55556 dataofs=5L chksum=0xd509 |<Padding  load='\x00\x00\x00\x00\x00\x00' |>>>>
+  <Ether  dst=00:00:5e:00:01:19 src=80:18:44:e2:6e:fc type=IPv4 |<IP  ihl=5L len=40 frag=0 proto=tcp chksum=0x990e src=10.12.205.180 dst=10.0.0.1 |<TCP  dport=55555 dataofs=5L chksum=0xd509 |<Padding  load='\x00\x00\x00\x00\x00\x00' |>>>>
+  <Ether  dst=00:00:5e:00:01:19 src=80:18:44:e2:6e:fc type=IPv4 |<IP  ihl=5L len=40 frag=0 proto=tcp chksum=0x990e src=10.12.205.180 dst=10.0.0.1 |<TCP  dport=55556 dataofs=5L chksum=0xd508 |<Padding  load='\x00\x00\x00\x00\x00\x00' |>>>>
+  4/4 packets sent in 2923.823us 0.001368mpps
+  
+RX - receive packet
+-------------------
+rx <port>
+~~~~~~~~~
+
+.. code:: text
+
+  # continuously receive on port 0 until Ctrl+C
+  testpmd> rx 0
+  6721984/0 packets received in 1163983.125us 5.774984mpps
+
+rx <port> <count> <timeout(s)> <verbose>
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. code:: text
+
+  # Receive 1 packet from port 0 with simple dump
+  testpmd> rx 0 1 0 1
+  Ether / IP / UDP 127.0.0.1:domain > 127.0.0.1:domain / Padding
+  1/1 packets received in 2064638.250us 0.000000mpps
+
+  # receive 1 packet with mbuf header, brief and hex dump
+  testpmd> rx 0 1 10 0x32
+  RX P:0 Q:0 len:60 ptype:0x291 ol_flags:0x180 rss:0x00000000 fdir:0x0
+    ptype: L2_ETHER L3_IPV4_EXT_UNKNOWN L4_UDP
+    ol_flags: PKT_RX_L4_CKSUM_GOOD PKT_RX_IP_CKSUM_GOOD
+  <Ether  dst=ff:ff:ff:ff:ff:ff src=00:00:00:00:00:00 type=IPv4 |<IP  ihl=5L len=28 frag=0 proto=udp chksum=0x7cce src=127.0.0.1 dst=127.0.0.1 |<UDP  len=8 chksum=0x172 |<Padding  load='\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' |>>>>
+  0000   FF FF FF FF FF FF 00 00  00 00 00 00 08 00 45 00   ..............E.
+  0010   00 1C 00 01 00 00 40 11  7C CE 7F 00 00 01 7F 00   ......@.|.......
+  0020   00 01 00 35 00 35 00 08  01 72 00 00 00 00 00 00   ...5.5...r......
+  0030   00 00 00 00 00 00 00 00  00 00 00 00               ............
+  1/1 packets received in 5180381.000us 0.000000mpps
+
+Expect - send, receive and compare
+-------------------------------------
+Need one of following topo to get packet back:
+
+  - VF to VF
+  - use testpmd io forwarding on remote server of a back-to-back connection
+  - set NIC phy in loopback mode
+  - use loopback connector on NIC port
+  - physical connect two port that DPDK support
+
+expect <tx_port> <rx_port> <scapy>
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Default timeout: 10ms
+
+.. code:: text
+
+  # basic send
+  testpmd> expect 0 0 Ether()  
+  tx: 1/1 1.211us 0.825826mpps    rx: 1/1 7.571us 0.132077mpps    round: 1/1 7.571us      total: 7.571us 0.132077mpps
+
+.. code:: text
+
+  # if not recevied:
+  testpmd> expect 0 0 Ether()
+  Failed tx: 1/1 8.439us 0.118503mpps     rx: 0/1 10006.879us 0.000000mpps        round: 1/1 10006.879us  total: 10006.879us 0.000000mpps
+
+.. code:: text
+
+  # if packet corrupted, auto diff hex:
+  testpmd> expect 0 0 Ether()/IP()
+  Failed: packet not same:
+  0000        FF FF FF FF FF FF 00 00  00 00 00 00 08 00 45 00   ..............E.
+       0000   00 00 00 00 00 00 FF FF  FF FF FF FF 08 00 45 00   ..............E.
+  0010 0010   00 14 00 01 00 00 40 00  7C E7 7F 00 00 01 7F 00   ......@.|.......
+  0020 0020   00 01 00 00 00 00 00 00  00 00 00 00 00 00 00 00   ................
+  0030 0030   00 00 00 00 00 00 00 00  00 00 00 00               ............
+  RX P:0 Q:0 len:60 ptype:0x691 ol_flags:0x80 rss:0x00000000 fdir:0x0
+    ptype: L2_ETHER L3_IPV4_EXT_UNKNOWN L4_NONFRAG
+    ol_flags: PKT_RX_L4_CKSUM_UNKNOWN PKT_RX_IP_CKSUM_GOOD
+  tx: 1/1 1.494us 0.669507mpps    rx: 1/1 6800.465us 0.000147mpps round: 1/1 6800.465us   total: 6800.465us 0.000147mpps
+
+expect <tx_port> <rx_port> <scapy> <count> <round> <timeout(ms)> <verbose> <field> <val>
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. code:: text
+
+  # dump rx header info and assert hw offload flag filed
+  testpmd> expect 0 0 Ether()/IP()/UDP() 1 1 1 0x10  ol_flags 0x182
+  RX P:0 Q:1 len:60 ptype:0x291 ol_flags:0x182 rss:0xf2279e9d fdir:0x0 ptype: L2_ETHER L3_IPV4_EXT_UNKNOWN L4_UDP
+  ol_flags: PKT_RX_RSS_HASH PKT_RX_L4_CKSUM_GOOD PKT_RX_IP_CKSUM_GOOD
+  tx: 1/1 6.240us 0.160256mpps    rx: 1/1 500.597us 0.001998mpps  round: 1/1 500.597us    total: 500.597us 0.001998mpps
+
+Supported field check:
+
+  queue, ptype, rss, fdir, ol_flags, non|0
+
+.. code:: text
+
+  # no packet expect to be received:
+  testpmd> expect 0 0 Ether()/IP()/UDP() 0 1 100 0x10  0 0
+  tx: 1/1 9.058us 0.110397mpps    rx: 0/0 100041.414us 0.000000mpps       round: 1/1 100041.414us total: 100041.414us 0.000000mpps
+
+  # Fail and auto dump if we do receive one:
+  testpmd> expect 0 0 Ether()/IP()/UDP() 0 1 100 0x0  ol_flags 0x182
+  RX P:0 Q:1 len:60 ptype:0x291 ol_flags:0x182 rss:0xf2279e9d fdir:0x0
+  ptype: L2_ETHER L3_IPV4_EXT_UNKNOWN L4_UDP
+  ol_flags: PKT_RX_RSS_HASH PKT_RX_L4_CKSUM_GOOD PKT_RX_IP_CKSUM_GOOD
+  Failed tx: 1/1 5.353us 0.186805mpps     rx: 1/0 100036.852us 0.000010mpps       round: 1/1 100036.852us total: 100036.852us 0.000010mpps
+
+.. code:: bash
+
+  # latency test, tx/rx 10000 rounds
+  testpmd> expect 0 0 Ether() 1 10000 1000 0 0 0
+  tx: 10000/10000 50401.309us 0.198408mpps        rx: 10000/10000 50406.070us 0.198389mpps        round: 10000/10000 5.041us      total: 50406.070us 0.198389mpps
+
+<timeout>:
+
+- 0: endless loop, could be canceled by Ctrl+C
+- integer: seconds(rx) or msecs(expect)
+
+<verbose>: same to global verbose definition
+
+
+Verbose level - global output control
+----------------------------------------------
+
+- set verbose <level>
+
+.. code:: text
+
+   xxxx xxxx xxxx xxxx
+   = == ====  === ====
+   | ||  |    |||  L-- RX 0:mute 1:short 2:brief 3:detail
+   | ||  |    ||L----- RX header dump
+   | ||  |    |L------ RX hex dump
+   | ||  |    L------- Mute succeed expect command, for batch running
+   | ||  L------------ TX 0:mute 1:short 2:brief 3:detail
+   | |L--------------- TX header dump
+   | L---------------- TX hex dump
+   L------------------ Echo CLI to screen during "load" command
+
+py - call python
+---------------- 
+py <commands>
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Any python grammar allowed:
+
+.. code:: text
+
+  testpmd> py 1+1
+  2
+
+  testpmd> py hex(12345)
+  '0x3039'
+
+  testpmd> py 0x12345
+  74565
+
+  testpmd> py a=Ether();b=UDP();a/IP()/b; a/IPv6()/b
+  <Ether  type=IPv4 |<IP  frag=0 proto=udp |<UDP  |>>>
+  <Ether  type=IPv6 |<IPv6  nh=UDP |<UDP  |>>>
+
+py shell - enter python shell
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.. code:: text
+
+  testpmd> py shell
+  >>> Help(Ether)
+  # "ctrl + d" to quit
+
+py <debug|nodebug>
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Toggle python lib debug
+
+PktGen Engine
+--------------------
+A new engine to tx, rx and compare packets based on templates.
+
+pktgen idle <mode>
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Behavior of idle:
+
+- 0 - drop: rx only
+- 1 - loopback: rx and send back
+- 2 - forward: using testpmd port-queue mapping
+- 3 - switch: switch mac address and send back
+
+Batch Test
+------------------------
+
+load <file>
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+load and run testpmd CLI batch in mute
+
+.. code:: text
+
+  testpmd> load test/expect/init.exp
+  Change verbose level from 0 to 64
+  Read CLI commands from test/expect/init.exp
+
+  # verify 
+  testpmd>py eth
+  <Ether  dst=aa:bb:cc:dd:ee:ff src=00:11:22:33:44:55 |>
+
+set verbose 0x8000
+~~~~~~~~~~~~~~~~~~~
+Set testpmd batch file loading with CLI echo to screen, easy to find source CLI if any error occurs.
+
+.. code:: text
+
+  testpmd> set verbose 0x8000
+  testpmd> load test/expect/rx.exp
+  testpmd> py eth = Ether(src="00:11:22:33:44:55",dst="aa:bb:cc:dd:ee:ff")
+  testpmd> py ethb = Ether(src="00:11:22:33:44:55",dst="ff:ff:ff:ff:ff:ff")
+  ...
+
+Known issues/TODO:
+---------------------
+- Code format
+- TX offload
+- Jumbo packet send
+- LRO rx
+- Multi-queue for max throughput
+- Dynamic packet template - slow but flexible
+- Test suit with summary
+- mbuf packet type in scapy?
+- dpdk wrapper for python - due to complexity to expand testpmd CLI, how about manipulating DPDK in python unit test framework?
+
+Design consideration:
+---------------------------
+- Syntax flexibility from Scapy
+- Speed of DPDK
+- Quick batch regression for developer to avoid anything broken
