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Intel 82599 Ethernet Controller Apps

Intel10G (apps.intel.intel_app)

The Intel10G drives one port of an Intel 82599 Ethernet controller. Packets taken from the rx port are transmitted onto the network. Packets received from the network are put on the tx port.

DIAGRAM: Intel10G
          +----------+
          |          |
  rx ---->* Intel10G *----> tx
          |          |
          +----------+

— Method Intel10G.dev:get_rxstats

Returns a table with the following keys:

  • counter_id - Counter id
  • packets - Number of packets received
  • dropped - Number of packets dropped
  • bytes - Total bytes received

— Method Intel10G.dev:get_txstats

Returns a table with the following keys:

  • counter_id - Counter id
  • packets - Number of packets sent
  • bytes - Total bytes sent

Configuration

The Intel10G app accepts a table as its configuration argument. The following keys are defined:

— Key pciaddr

Required. The PCI address of the NIC as a string.

— Key macaddr

Optional. The MAC address to use as a string. The default is a wild-card (e.g. accept all packets).

— Key vlan

Optional. A twelve bit integer (0-4095). If set, incoming packets from other VLANs are dropped and outgoing packets are tagged with a VLAN header.

— Key vmdq

Optional. Boolean, defaults to false. Enables interface virtualization. Allows to have multiple Intel10G apps per port. If enabled, macaddr must be specified.

— Key mirror

Optional. A table. If set, this app will receive copies of all selected packets on the physical port. The selection is configured by setting keys of the mirror table. Either mirror.pool or mirror.port may be set.

If mirror.pool is true all pools defined on this physical port are mirrored. If mirror.pool is an array of pool numbers then the specified pools are mirrored.

If mirror.port is one of "in", "out" or "inout" all incoming and/or outgoing packets on the port are mirrored respectively. Note that this does not include internal traffic which does not enter or exit through the physical port.

— Key rxcounter

— Key txcounter

Optional. Four bit integers (0-15). If set, incoming/outgoing packets will be counted in the selected statistics counter respectively. Multiple apps can share a counter. To retrieve counter statistics use Intel10G.dev:get_rxstats() and Intel10G.dev:get_txstats().

— Key rate_limit

Optional. Number. Limits the maximum Mbit/s to transmit. Default is 0 which means no limit. Only applies to outgoing traffic.

— Key priority

Optional. Floating point number. Weight for the round-robin algorithm used to arbitrate transmission when rate_limit is not set or adds up to more than the line rate of the physical port. Default is 1.0 (scaled to the geometric middle of the scale which goes from 1/128 to 128). The absolute value is not relevant, instead only the ratio between competing apps controls their respective bandwidths. Only applies to outgoing traffic.

For example, if two apps without rate_limit set have the same priority, both get the same output bandwidth. If the priorities are 3.0/1.0, the output bandwidth is split 75%/25%. Likewise, 1.0/0.333 or 1.5/0.5 yield the same result.

Note that even a low-priority app can use the whole line rate unless other (higher priority) apps are using up the available bandwidth.

Performance

The Intel10G app can transmit and receive at approximately 10 Mpps per processor core.

Hardware limits

Each physical Intel 82599 port supports the use of up to:

  • 64 pools (virtualized Intel10G app instances)
  • 127 MAC addresses (see the macaddr configuration option)
  • 64 VLANs (see the vlan configuration option)
  • 4 mirror pools (see the mirror configuration option)

Intel1G (apps.intel.intel1g.intel1g)

The intel1g app drives one port of an Intel Gigabit Ethernet controller.

Hardware support:

  • Intel i210, i350 (in progress)

Features:

  • Optionally attach to a pre-initialized NIC.

  • Optionally use specific TX and RX queue numbers (or none).

  • Configuration and statistics registers are mirrored to shared memory objects (NYI).

  • Receive and transmit links are optional and can have any name.

    DIAGRAM: Intel1g +----------+ | | -=-->* Intel1g *--=-> | | +----------+

Configuration

— Key pciaddr

Required. The PCI address of the NIC as a string.

— Key attach

Optional. True means attach to a transmit and/or receive queue of an already-initialized NIC.

— Key txq

Optional. Transmit queue number to use. false means no transmit function. Default: 0.

— Key rxq

Optional. Receive queue number to use. false means no receive function. Default: 0.

— Key ndesc

Optional. Number of DMA descriptors to use i.e. size of the DMA transmit and receive queues. Must be a multiple of 128. Default is not specified but assumed to be broadly applicable.

— Key rxburst

Optional. Maximum number of packets to receive on one breath. Default is not specified but assumed to be broadly applicable.

+— Key loopback Optional. Set to "MAC" for MAC loopback, or to "PHY" for PHY loopback modes.

LoadGen (apps.intel.loadgen)

LoadGen is a load generator app based on the Intel 82599 Ethernet controller. It reads up to 32,000 packets from the input port and transmits them repeatedly onto the network. All incoming packets are dropped.

DIAGRAM: LoadGen
           +----------+
           |          |
input ---->*  LoadGen |
           |          |
           +----------+

Configuration

The LoadGen app accepts a string as its configuration argument. The given string denotes the PCI address of the NIC to use.

Performance

The LoadGen app can transmit at line-rate (14 Mpps) without significant CPU usage.