Merge branch 'octeontx2-pf-mbox-fixes'

Subbaraya Sundeep says:

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octeontx2-pf: RVU Mailbox fixes

This patchset fixes the problems related to RVU mailbox.
During long run tests some times VF commands like setting
MTU or toggling interface fails because VF mailbox is timedout
waiting for response from PF.

Below are the fixes
Patch 1: There are two types of messages in RVU mailbox namely up and down
messages. Down messages are synchronous messages where a PF/VF sends
a message to AF and AF replies back with response. UP messages are
notifications and are asynchronous like AF sending link events to
PF. When VF sends a down message to PF, PF forwards to AF and sends
the response from AF back to VF. PF has to forward VF messages since
there is no path in hardware for VF to send directly to AF.
There is one mailbox interrupt from AF to PF when raised could mean
two scenarios one is where AF sending reply to PF for a down message
sent by PF and another one is AF sending up message asynchronously
when link changed for that PF. Receiving the up message interrupt while
PF is in middle of forwarding down message causes mailbox errors.
Fix this by receiver detecting the type of message from the mbox data register
set by sender.

Patch 2:
During VF driver remove, VF has to wait until last message is
completed and then turn off mailbox interrupts from PF.

Patch 3:
Do not use ordered workqueue for message processing since multiple works are
queued simultaneously by all the VFs and PF link UP messages.

Patch 4:
When sending link event to VF by PF check whether VF is really up to
receive this message.

Patch 5:
In AF driver, use separate interrupt handlers for the AF-VF interrupt and
AF-PF interrupt. Sometimes both interrupts are raised to two CPUs at same
time and both CPUs execute same function at same time corrupting the data.

v2 changes:
	Added missing mutex unlock in error path in patch 1
	Refactored if else logic in patch 1 as suggested by Paolo Abeni
====================

Signed-off-by: David S. Miller <davem@davemloft.net>