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doc: add basic howto for flow API
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As the rte_flow is a new complex module in the DPDK.
In order to ease developers in to using this feature
it was suggested to supply a simple howto doc.

Signed-off-by: Ori Kam <orika@mellanox.com>
Acked-by: John McNamara <john.mcnamara@intel.com>
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lm_bond_virtio_sriov
lm_virtio_vhost_user
flow_bifurcation
rte_flow
pvp_reference_benchmark
vfd
virtio_user_for_container_networking
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333 changes: 333 additions & 0 deletions doc/guides/howto/rte_flow.rst
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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:
* Redistributions of source code must retain the above copyright
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
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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

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