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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 ` . * Details of the TestPMD commands to set the flow rules can be found in the following link: :ref:`TestPMD Flow rules ` 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_eth 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 = ð /* 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_eth 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 = ð /* 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_eth 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 = ð /* 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