[ovs-git] [openvswitch/ovs] 40e940: netdev-dpdk: support port representors

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/openvswitch/ovs
  Commit: 40e940e4391f67eeba6f7a1619f9562c104a9424
      https://github.com/openvswitch/ovs/commit/40e940e4391f67eeba6f7a1619f9562c104a9424
  Author: Ophir Munk <ophirmu at mellanox.com>
  Date:   2019-01-17 (Thu, 17 Jan 2019)

  Changed paths:
    M NEWS
    M lib/netdev-dpdk.c

  Log Message:
  -----------
  netdev-dpdk: support port representors

Dpdk port representors were introduced in dpdk versions 18.xx.
Prior to port representors there was a one-to-one relationship
between an rte device (e.g. PCI bus) and an eth device (referenced as
dpdk port id in OVS). With port representors the relationship becomes
one-to-many rte device to eth devices.
For example in [3] there are two devices (representors) using the same
PCI physical address 0000:08:00.0: "0000:08:00.0,representor=[3]" and
"0000:08:00.0,representor=[5]".
This commit handles the new one-to-many relationship. For example,
when one of the device port representors in [3] is closed - the PCI bus
cannot be detached until the other device port representor is closed as
well. OVS remains backward compatible by supporting dpdk legacy PCI
ports which do not include port representors.
Dpdk port representors related commits are listed in [1]. Dpdk port
representors documentation appears in [2]. A sample configuration
which uses two representors ports (the output of "ovs-vsctl show"
command) is shown in [3].

[1]
e0cb96204b71 ("net/i40e: add support for representor ports")
cf80ba6e2038 ("net/ixgbe: add support for representor ports")
26c08b979d26 ("net/mlx5: add port representor awareness")

[2]
https://doc.dpdk.org/guides-18.11/prog_guide/switch_representation.html

[3]
Bridge "ovs_br0"
    Port "ovs_br0"
  Interface "ovs_br0"
      type: internal
    Port "port-rep3"
  Interface "port-rep3"
      type: dpdk
      options: {dpdk-devargs="0000:08:00.0,representor=[3]"}
    Port "port-rep5"
  Interface "port-rep5"
      type: dpdk
      options: {dpdk-devargs="0000:08:00.0,representor=[5]"}
    ovs_version: "2.10.90"

Signed-off-by: Ophir Munk <ophirmu at mellanox.com>
Co-authored-by: Ilya Maximets <i.maximets at samsung.com>
Signed-off-by: Ilya Maximets <i.maximets at samsung.com>
Signed-off-by: Ian Stokes <ian.stokes at intel.com>



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