ixv: Negotiate VF queue-set limitsHEADmain

ixv uses one queue set on 82599 and X540 VFs and assumes two on
X550-family VFs.  The PF reports the queues assigned to each VF with
GET_QUEUES after mailbox API 1.1 negotiation.

Query the PF during attach.  Bound symmetric iflib queue sets by the PF
grant and available MSI-X data vectors.  Retain one queue set per data
vector: ixgbe VFs expose at most three vectors and one is reserved for
the mailbox.  The hardware permits each pool to use a subset of its RSS
queues, so a two-queue ceiling is valid when the PF assigns four.

This enables the second data vector on 82599 and X540 while avoiding an
assumed second queue when an X550-family VF is granted only one.  Keep
the existing family limits if the mailbox is unavailable or the PF uses
an older API.

MFC after:	2 weeks

0 files changed, 0 insertions, 0 deletions