dedicated queues(txq, rxq). A SF netdev supports E-Switch representation
offload similar to existing PF and VF representors. A SF shares PCI level
resources with other SFs and/or with its parent PCI function.

From SmartNIC perspective, when PCI device is shared for multi-host,
representors for host controller and host PF is required.

This patch set introduces new representor types in addtion to existing VF
representor. Syntax:

[[c#]pf#]vf#: VF port representor/s from controller/pf
[[c#]pf#]sf#: SF port representor/s from controller/pf
#: VF representor - for backwards compatibility

"#" is number instance, list or range, valid examples:
  1, [1,3,5], [0-3], [0,2-4,6]

For backward compatibility, this patch also introduces new netdev capability
to indicate the capability of supportting SF representor.

Version history:
 RFC:
 	initial version [2]
 V2:
    - separate patch for represnetor infrastructure, controller, pf and
      sf.
    - replace representor ID macro with functions:
      rte_eth_representor_id_encode()
      rte_eth_representor_id_parse()
    - new patch to allow devargs with same PCI BDF but different
      representors.
    - other minor code updates according to comments, thanks Andrew!
    - update document
 V3:
    - improve probing of allowed devargs with same name.
    - parse single word of kvargs as key.
    - update kvargs test cases.
 V4:
    - split first representor refactor patch into
      1: add representor type
      2: refector representor list parsing
    - push the patch supporting multi-devargs for same device.
 V5:
    - add comments for parsing functions
    - update switch_representation.rst - Thanks Ajit

Hi,

The series can't recognize i40e device, so testpmd start failed.

	./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 4-8 -n 6 -a 17:00.0 -- -i --txq=2 --rxq=2
	<...>
	EAL: Probe PCI driver: net_i40e (8086:158b) device: 0000:17:00.0 (socket 0)
	EAL: No legacy callbacks, legacy socket not created
	testpmd: No probed ethernet devices
	Interactive-mode selected
	Fail: input txq (2) can't be greater than max_tx_queues (0) of port 0
	EAL: Error - exiting with code: 1
	  Cause: txq 2 invalid - must be >= 0 && <= 0

thanks