idpf: add idpf_virtchnl.h

idpf.h is quite heavy. We can reduce the burden a fair bit by
introducing an idpf_virtchnl.h file. This mostly just moves function
declarations but there are many of them. This also makes an attempt to
group those declarations in a way that makes some sense instead of
mishmashed.

Suggested-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Signed-off-by: Alan Brady <alan.brady@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

idpf: initialize interrupts and enable vport

To further continue 'vport open', initialize all the resources
required for the interrupts. To start with, initialize the
queue vector indices with the ones received from the device
Control Plane. Now that all the TX and RX queues are initialized,
map the RX descriptor and buffer queues as well as TX completion
queues to the allocated vectors. Initialize and enable the napi
handler for the napi polling. Finally, request the IRQs for the
interrupt vectors from the stack and setup the interrupt handler.

Once the interrupt init is done, send 'map queue vector', 'enable
queues' and 'enable vport' virtchnl messages to the CP to complete
the 'vport open' flow.

Co-developed-by: Alan Brady <alan.brady@intel.com>
Signed-off-by: Alan Brady <alan.brady@intel.com>
Co-developed-by: Joshua Hay <joshua.a.hay@intel.com>
Signed-off-by: Joshua Hay <joshua.a.hay@intel.com>
Co-developed-by: Madhu Chittim <madhu.chittim@intel.com>
Signed-off-by: Madhu Chittim <madhu.chittim@intel.com>
Co-developed-by: Phani Burra <phani.r.burra@intel.com>
Signed-off-by: Phani Burra <phani.r.burra@intel.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Pavan Kumar Linga <pavan.kumar.linga@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

idpf: add core init and interrupt request

As the mailbox is setup, add the necessary send and receive
mailbox message framework to support the virtchnl communication
between the driver and device Control Plane (CP).

Add the core initialization. To start with, driver confirms the
virtchnl version with the CP. Once that is done, it requests
and gets the required capabilities and resources needed such as
max vectors, queues etc.

Based on the vector information received in 'VIRTCHNL2_OP_GET_CAPS',
request the stack to allocate the required vectors. Finally add
the interrupt handling mechanism for the mailbox queue and enable
the interrupt.

Note: Checkpatch issues a warning about IDPF_FOREACH_VPORT_VC_STATE and
IDPF_GEN_STRING being complex macros and should be enclosed in parentheses
but it's not the case. They are never used as a statement and instead only
used to define the enum and array.

Co-developed-by: Alan Brady <alan.brady@intel.com>
Signed-off-by: Alan Brady <alan.brady@intel.com>
Co-developed-by: Emil Tantilov <emil.s.tantilov@intel.com>
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Co-developed-by: Joshua Hay <joshua.a.hay@intel.com>
Signed-off-by: Joshua Hay <joshua.a.hay@intel.com>
Co-developed-by: Madhu Chittim <madhu.chittim@intel.com>
Signed-off-by: Madhu Chittim <madhu.chittim@intel.com>
Co-developed-by: Phani Burra <phani.r.burra@intel.com>
Signed-off-by: Phani Burra <phani.r.burra@intel.com>
Co-developed-by: Shailendra Bhatnagar <shailendra.bhatnagar@intel.com>
Signed-off-by: Shailendra Bhatnagar <shailendra.bhatnagar@intel.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Pavan Kumar Linga <pavan.kumar.linga@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

idpf: add controlq init and reset checks

At the end of the probe, initialize and schedule the event workqueue.
It calls the hard reset function where reset checks are done to find
if the device is out of the reset. Control queue initialization and
the necessary control queue support is added.

Introduce function pointers for the register operations which are
different between PF and VF devices.

Signed-off-by: Joshua Hay <joshua.a.hay@intel.com>
Co-developed-by: Alan Brady <alan.brady@intel.com>
Signed-off-by: Alan Brady <alan.brady@intel.com>
Co-developed-by: Madhu Chittim <madhu.chittim@intel.com>
Signed-off-by: Madhu Chittim <madhu.chittim@intel.com>
Co-developed-by: Phani Burra <phani.r.burra@intel.com>
Signed-off-by: Phani Burra <phani.r.burra@intel.com>
Co-developed-by: Shailendra Bhatnagar <shailendra.bhatnagar@intel.com>
Signed-off-by: Shailendra Bhatnagar <shailendra.bhatnagar@intel.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Co-developed-by: Pavan Kumar Linga <pavan.kumar.linga@intel.com>
Signed-off-by: Pavan Kumar Linga <pavan.kumar.linga@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>