[dpdk-dev] [RFC 0/5] Port Representor for control and monitoring of VF devices

[Mohammad Abdul Awal]

Signed-off-by: Mohammad Abdul Awal <mohammad.abdul.awal at intel.com>
Signed-off-by: Remy Horton <remy.horton at intel.com>
Signed-off-by: Declan Doherty <declan.doherty at intel.com>
---
This RFC introduces a port representor based model for the control, management
and monitoring of SR-IOV virtual function (VF) devices for control plane
applications which have bound the devices physical function.

Port Representors are virtual poll mode drivers (PMD) which provide a logical
representation in DPDK for VF ports for control and monitoring. Each port
representor PMD represents a single VF and is associated with it's parent
physical function (PF) PMD which provides the back-end hooks for the representor
device ops and defines the control domain to which that port belongs.This
allows to use existing DPDK APIs to monitor and control the port without the
need to create and maintain VF specific APIs.


+-----------------------------+   +---------------+  +---------------+
|        Control Plane        |   |   Data Plane  |  |   Data Plane  |
|         Application         |   |   Application |  |   Application |
+-----------------------------+   +---------------+  +---------------+
|         eth dev api         |   |  eth dev api  |  |  eth dev api  |
+-----------------------------+   +---------------+  +---------------+
+-------+  +-------+  +-------+   +---------------+  +---------------+
|  PF0  |  | Port  |  | Port  |   |    VF0 PMD    |  |    VF0 PMD    |
|  PMD  <--+ Rep 0 |  | Rep 1 |   +---------------+  +------+--------+
|       |  | PMD   |  | PMD   |                             |
+---+--^+  +-------+  +-+-----+                             |
    |  |                |  |                                |
    |  +----------------+  |                                |
    |                      |                                |
    |                      |                                |
+--------------------------------+                          |
|   |  HW (logical view)   |     |                          |
| --+------+ +-------+ +---+---+ |                          |
| |   PF   | |  VF0  | |  VF1  | |                          |
| |        | |       | |       +----------------------------+
| +--------+ +-------+ +-------+ |
| +----------------------------+ |
| |        VEB                 | |
| +----------------------------+ |
| +--------+                     |
| |  Port  |                     |
| |   0    |                     |
| +--------+                     |
+--------------------------------+

The figure above shows a deployment where the PF is bound to a DPDK control
plane application which uses representor ports to manage the configuration and
monitoring of it's VF ports. Each virtual function is represented in the
application by a representor port PMD which enables control of the corresponding
VF through eth dev APIs on the representor PMD such as:

- void rte_eth_promiscuous_enable(uint8_t port_id);
- void rte_eth_promiscuous_disable(uint8_t port_id);
- void rte_eth_allmulticast_enable(uint8_t port_id);
- void rte_eth_allmulticast_disable(uint8_t port_id);
- int rte_eth_dev_mac_addr_add(uint8_t port, struct ether_addr *mac_addr,
	uint32_t pool);
- int rte_eth_dev_set_vlan_offload(uint8_t port_id, int offload_mask);

as well as monitoring through API's like

- void rte_eth_link_get(uint8_t port_id, struct rte_eth_link *link);
- int rte_eth_stats_get(uint8_t port_id, struct rte_eth_stats *stats);

The port representor infrastructure is enabled through a single common, device
independent, virtual PMD whos context is initialized and enabled through a
broker instance running within the context of the physical function device
driver.

+-------------------------+       +-------------------------+
|        rte_ethdev       |       |       rte_ethdev        |
+-------------------------+       +-------------------------+
|  Physical Function PMD  |       |  Port Reperesentor PMD  |
|         +-------------+ |       | +---------+ +---------+ |
|         | Representor | |       | | dev_data| | dev_ops | |
|         |    Broker   | |       | +----+----+ +----+----+ |
|         | +---------+ | |       +------|-----------|------+
|         | | VF Port | | |              |           |
|         | | Context +------------------+           |
|         | +---------+ | |                          |
|         | +---------+ | |                          |
|         | | Handler +------------------------------+
|         | |   Ops   | | |
|         | +---------+ | |
|         +-------------+ |
+-------------------------+

Creation of representor ports can be achieved either through the --vdev EAL
option or through the rte_vdev_init() API. Each port representor requires the
BDF of it's parent PF and the Virtual Function ID of the port which the
representor will support. During initialization of the representor PMD, it calls
the broker API to register itself with the PF PMD and to get it's context
configured which includes the setting up of it's context and ops function
handlers.


As the port representor model is based around the paradigm of using standard
port based APIs, it will allow future expansion of functionality without the
need to add new APIs. For example it should be possible to support configuration
of egress QoS parameters using existing TM APIs by extending the port
representor PMD/broker infrastructure.

Mohammad Abdul Awal (5):
  Implemented port representor broker infrastructure, created BDF to
    port     function.
  added --enable-representor command line argument in EAL to load    
    representor broker infrastructure.
  Implement port representor PMD
  Enable port representor PMD and broker for fortville PMD driver
  Enable port representor PMD and broker for ixgbe PMD driver.

 config/common_base                                 |   5 +
 drivers/net/Makefile                               |   2 +
 drivers/net/i40e/Makefile                          |   1 +
 drivers/net/i40e/i40e_ethdev.c                     |  17 +
 drivers/net/i40e/i40e_prep_ops.c                   | 402 +++++++++
 drivers/net/i40e/i40e_prep_ops.h                   |  41 +
 drivers/net/i40e/rte_pmd_i40e.c                    |  47 +
 drivers/net/i40e/rte_pmd_i40e.h                    |  18 +
 drivers/net/ixgbe/Makefile                         |   2 +-
 drivers/net/ixgbe/ixgbe_ethdev.c                   |  33 +-
 drivers/net/ixgbe/ixgbe_ethdev.h                   |  11 +
 drivers/net/ixgbe/ixgbe_prep_ops.c                 | 279 ++++++
 drivers/net/ixgbe/ixgbe_prep_ops.h                 |  41 +
 drivers/net/representor/Makefile                   |  51 ++
 drivers/net/representor/rte_eth_representor.c      | 973 +++++++++++++++++++++
 .../representor/rte_pmd_representor_version.map    |   4 +
 lib/librte_eal/bsdapp/eal/eal.c                    |   6 +
 lib/librte_eal/common/eal_common_options.c         |   1 +
 lib/librte_eal/common/eal_internal_cfg.h           |   2 +
 lib/librte_eal/common/eal_options.h                |   2 +
 lib/librte_eal/common/include/rte_eal.h            |   8 +
 lib/librte_eal/linuxapp/eal/eal.c                  |   9 +
 lib/librte_ether/Makefile                          |   2 +
 lib/librte_ether/rte_ethdev.c                      |  93 ++
 lib/librte_ether/rte_ethdev.h                      |  26 +
 lib/librte_ether/rte_ethdev_vdev.h                 |  37 +-
 lib/librte_ether/rte_ether_version.map             |   9 +
 lib/librte_ether/rte_port_representor.c            | 160 ++++
 lib/librte_ether/rte_port_representor.h            | 289 ++++++
 mk/rte.app.mk                                      |   1 +
 30 files changed, 2556 insertions(+), 16 deletions(-)
 create mode 100644 drivers/net/i40e/i40e_prep_ops.c
 create mode 100644 drivers/net/i40e/i40e_prep_ops.h
 create mode 100644 drivers/net/ixgbe/ixgbe_prep_ops.c
 create mode 100644 drivers/net/ixgbe/ixgbe_prep_ops.h
 create mode 100644 drivers/net/representor/Makefile
 create mode 100644 drivers/net/representor/rte_eth_representor.c
 create mode 100644 drivers/net/representor/rte_pmd_representor_version.map
 create mode 100644 lib/librte_ether/rte_port_representor.c
 create mode 100644 lib/librte_ether/rte_port_representor.h

-- 
2.7.4