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..  BSD LICENSE
    Copyright(c) 2017 Mellanox Corporation. All rights reserved.
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

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    notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.
    * Neither the name of Mellanox Corporation nor the names of its
    contributors may be used to endorse or promote products derived
    from this software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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Generic flow API - examples
===========================

This document demonstrates some concrete examples for programming flow rules
with the ``rte_flow`` APIs.

* Detail of the rte_flow APIs can be found in the following link:
  :ref:`Generic flow API <Generic_flow_API>` .

* Details of the TestPMD commands to set the flow rules can be found in the
  following link: :ref:`TestPMD Flow rules <testpmd_rte_flow>`

Simple IPv4 drop
----------------

Description
~~~~~~~~~~~

In this example we will create a simple rule that drops packets whose IPv4
destination equals 192.168.3.2. This code is equivalent to the following
testpmd command (wrapped for clarity)::

  tpmd> flow create 0 ingress pattern eth / vlan /
                    ipv4 dst is 192.168.3.2 / end actions drop / end

Code
~~~~

.. code-block:: c

  /* create the attribute structure */
  struct rte_flow_attr attr = {.ingress = 1};
  struct rte_flow_item pattern[MAX_PATTERN_IN_FLOW];
  struct rte_flow_action actions[MAX_ACTIONS_IN_FLOW];
  struct rte_flow_item_etc eth;
  struct rte_flow_item_vlan vlan;
  struct rte_flow_item_ipv4 ipv4;
  struct rte_flow *flow;
  struct rte_flow_error error;

  /* setting the eth to pass all packets */
  pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
  pattern[0].spec = &eth;

  /* set the vlan to pas all packets */
  pattern[1] = RTE_FLOW_ITEM_TYPE_VLAN;
  pattern[1].spec = &vlan;

  /* set the dst ipv4 packet to the required value */
  ipv4.hdr.dst_addr = htonl(0xc0a80302);
  pattern[2].type = RTE_FLOW_ITEM_TYPE_IPV4;
  pattern[2].spec = &ipv4;

  /* end the pattern array */
  pattern[3].type = RTE_FLOW_ITEM)TYPE_END;

  /* create the drop action */
  actions[0].type = RTE_FLOW_ACTION_TYPE_DROP;
  actions[1].type = RTE_FLOW_ACTION_TYPE_END;

  /* validate and create the flow rule */
  if (!rte_flow_validate(port_id, &attr, pattern, actions, &error)
      flow = rte_flow_create(port_id, &attr, pattern, actions, &error)

Output
~~~~~~

Terminal 1: running sample app with the flow rule disabled::

  ./filter-program disable
  [waiting for packets]

Terminal 2: running scapy::

  $scapy
  welcome to Scapy
  >> sendp(Ether()/Dot1Q()/IP(src='176.80.50.4', dst='192.168.3.1'), \
           iface='some interface', count=1)
  >> sendp(Ether()/Dot1Q()/IP(src='176.80.50.5', dst='192.168.3.2'), \
           iface='some interface', count=1)

Terminal 1: output log::

  received packet with src ip = 176.80.50.4
  received packet with src ip = 176.80.50.5

Terminal 1: running sample the app flow rule enabled::

  ./filter-program enabled
  [waiting for packets]

Terminal 2: running scapy::

  $scapy
  welcome to Scapy
  >> sendp(Ether()/Dot1Q()/IP(src='176.80.50.4', dst='192.168.3.1'),  \
           iface='some interface', count=1)
  >> sendp(Ether()/Dot1Q()/IP(src='176.80.50.5', dst ='192.168.3.2'), \
           iface='some interface', count=1)

Terminal 1: output log::

  received packet with src ip = 176.80.50.4

Range IPv4 drop
----------------

Description
~~~~~~~~~~~

In this example we will create a simple rule that drops packets whose IPv4
destination is in the range 192.168.3.0 to 192.168.3.255. This is done using
a mask.

This code is equivalent to the following testpmd command (wrapped for
clarity)::

  tpmd> flow create 0 ingress pattern eth / vlan /
                    ipv4 dst spec 192.168.3.0 dst mask 255.255.255.0 /
	            end actions drop / end

Code
~~~~

.. code-block:: c

  struct rte_flow_attr attr = {.ingress = 1};
  struct rte_flow_item pattern[MAX_PATTERN_IN_FLOW];
  struct rte_flow_action actions[MAX_ACTIONS_IN_FLOW];
  struct rte_flow_item_etc eth;
  struct rte_flow_item_vlan vlan;
  struct rte_flow_item_ipv4 ipv4;
  struct rte_flow_item_ipv4 ipv4_mask;
  struct rte_flow *flow;
  struct rte_flow_error error;

  /* setting the eth to pass all packets */
  pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
  pattern[0].spec = &eth;

  /* set the vlan to pas all packets */
  pattern[1] = RTE_FLOW_ITEM_TYPE_VLAN;
  pattern[1].spec = &vlan;

  /* set the dst ipv4 packet to the required value */
  ipv4.hdr.dst_addr = htonl(0xc0a80300);
  ipv4_mask.hdr.dst_addr = htonl(0xffffff00);
  pattern[2].type = RTE_FLOW_ITEM_TYPE_IPV4;
  pattern[2].spec = &ipv4;
  pattern[2].mask = &ipv4_mask;

  /* end the pattern array */
  pattern[3].type = RTE_FLOW_ITEM)TYPE_END;

  /* create the drop action */
  actions[0].type = RTE_FLOW_ACTION_TYPE_DROP;
  actions[1].type = RTE_FLOW_ACTION_TYPE_END;

  /* validate and create the flow rule */
  if (!rte_flow_validate(port_id, &attr, pattern, actions, &error)
      flow = rte_flow_create(port_id, &attr, pattern, actions, &error)

Output
~~~~~~

Terminal 1: running sample app flow rule disabled::

  ./filter-program disable
  [waiting for packets]

Terminal 2: running scapy::

  $scapy
  welcome to Scapy
  >> sendp(Ether()/Dot1Q()/IP(src='176.80.50.4', dst='192.168.3.1'), \
           iface='some interface', count=1)
  >> sendp(Ether()/Dot1Q()/IP(src='176.80.50.5', dst='192.168.3.2'), \
           iface='some interface', count=1)
  >> sendp(Ether()/Dot1Q()/IP(src='176.80.50.6', dst='192.168.5.2'), \
           iface='some interface', count=1)

Terminal 1: output log::

  received packet with src ip = 176.80.50.4
  received packet with src ip = 176.80.50.5
  received packet with src ip = 176.80.50.6

Terminal 1: running sample app flow rule enabled::

  ./filter-program enabled
  [waiting for packets]

Terminal 2: running scapy::

  $scapy
  welcome to Scapy
  >> sendp(Ether()/Dot1Q()/IP(src='176.80.50.4', dst='192.168.3.1'), \
           iface='some interface', count=1)
  >> sendp(Ether()/Dot1Q()/IP(src='176.80.50.5', dst='192.168.3.2'), \
           iface='some interface', count=1)
  >> sendp(Ether()/Dot1Q()/IP(src='176.80.50.6', dst='192.168.5.2'), \
           iface='some interface', count=1)

Terminal 1: output log::

  received packet with src ip = 176.80.50.6

Send vlan to queue
------------------

Description
~~~~~~~~~~~

In this example we will create a rule that routes all vlan id 123 to queue 3.

This code is equivalent to the following testpmd command (wrapped for
clarity)::

  tpmd> flow create 0 ingress pattern eth / vlan vid spec 123 /
                    end actions queue index 3 / end

Code
~~~~

.. code-block:: c

  struct rte_flow_attr attr = {.ingress = 1};
  struct rte_flow_item pattern[MAX_PATTERN_IN_FLOW];
  struct rte_flow_action actions[MAX_ACTIONS_IN_FLOW];
  struct rte_flow_item_etc eth;
  struct rte_flow_item_vlan vlan;
  struct rte_flow_action_queue queue = { .index = 3 };
  struct rte_flow *flow;
  struct rte_flow_error error;

  /* setting the eth to pass all packets */
  pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
  pattern[0].spec = &eth;

  /* set the vlan to pas all packets */
  vlan.vid = 123;
  pattern[1] = RTE_FLOW_ITEM_TYPE_VLAN;
  pattern[1].spec = &vlan;

  /* end the pattern array */
  pattern[2].type = RTE_FLOW_ITEM)TYPE_END;

  /* create the drop action */
  actions[0].type = RTE_FLOW_ACTION_TYPE_QUEUE;
  actions[0].conf = &queue
  actions[1].type = RTE_FLOW_ACTION_TYPE_END;

  /* validate and create the flow rule */
  if (!rte_flow_validate(port_id, &attr, pattern, actions, &error)
      flow = rte_flow_create(port_id, &attr, pattern, actions, &error)

Output
~~~~~~

Terminal 1: running sample app flow rule disabled::

  ./filter-program disable
  [waiting for packets]

Terminal 2: running scapy::

  $scapy
  welcome to Scapy
  >> sendp(Ether()/Dot1Q(vlan=123)/IP(src='176.80.50.4', dst='192.168.3.1'), \
           iface='some interface', count=1)
  >> sendp(Ether()/Dot1Q(vlan=50)/IP(src='176.80.50.5', dst='192.168.3.2'),  \
           iface='some interface', count=1)
  >> sendp(Ether()/Dot1Q(vlan=123)/IP(src='176.80.50.6', dst='192.168.5.2'), \
           iface='some interface', count=1)

Terminal 1: output log::

  received packet with src ip = 176.80.50.4 sent to queue 2
  received packet with src ip = 176.80.50.5 sent to queue 1
  received packet with src ip = 176.80.50.6 sent to queue 0

Terminal 1: running sample app flow rule enabled::

  ./filter-program enabled
  [waiting for packets]

Terminal 2: running scapy::

  $scapy
  welcome to Scapy
  >> sendp(Ether()/Dot1Q(vlan=123)/IP(src='176.80.50.4', dst='192.168.3.1'), \
           iface='some interface', count=1)
  >> sendp(Ether()/Dot1Q(vlan=50)/IP(src='176.80.50.5', dst='192.168.3.2'),  \
           iface='some interface', count=1)
  >> sendp(Ether()/Dot1Q(vlan=123)/IP(src='176.80.50.6', dst='192.168.5.2'), \
           iface='some interface', count=1)

Terminal 1: output log::

  received packet with src ip = 176.80.50.4 sent to queue 3
  received packet with src ip = 176.80.50.5 sent to queue 1
  received packet with src ip = 176.80.50.6 sent to queue 3