Merge branch 'enic-sr-iov-v2-admin-channel-and-mbox-protocol'

Satish Kharat says:

====================
enic: SR-IOV V2 admin channel and MBOX protocol

This series adds the admin channel infrastructure and mailbox (MBOX)
protocol needed for V2 SR-IOV support in the enic driver.

The V2 SR-IOV design uses a direct PF-VF communication channel built on
dedicated WQ/RQ/CQ hardware resources and an MSI-X interrupt.

This series touches enic_remove(), which is also modified by a fix
already applied to net:

  enic: fix tx_hang_reset use-after-free on device removal
  https://git.kernel.org/netdev/net/c/ec680ea4ba1b

That fix was previously carried at the head of this series (patch 1 in
v10-v12); it has been split out and applied to net separately.  This
net-next series no longer includes it and applies cleanly on current
net-next, which already contains that fix (via the net -> net-next
merge); the overlapping enic_remove() teardown-ordering change is
incorporated in this series.

Firmware capability and admin channel infrastructure (patches 1-4):
  - Probe-time firmware feature check for V2 SR-IOV support
  - Admin channel open/close, RQ buffer management, CQ service
    with MSI-X interrupt and workqueue-based polling

MBOX protocol and VF enable (patches 5-10):
  - MBOX message types, core send/receive, PF and VF handlers
  - V2 SR-IOV enable wiring with admin channel setup
  - V2 VF probe with admin channel and PF registration

Patch 11 completes reset recovery for V2 VFs: the reset paths added
earlier in the series re-establish the admin channel only for the PF,
which left a VF unregistered and unable to exchange MBOX traffic after
a reset taken on the VF.

Known follow-ups (not blocking this series; the V2 PF data path is not
yet activated and V2 VFs are brought up only in a later series that wires
.sriov_configure):
  - Full request/reply correlation by msg_num requires the MBOX peer to
    echo the request number; this series retains the existing
    single-outstanding-request model with reply-type gating.
  - PF-side registration synchronization, initial link-state retry, and
    admin control-message throttling will be completed alongside the
    .sriov_configure enablement.
====================

Link: https://patch.msgid.link/20260812-enic-sriov-v2-admin-channel-v2-v13-0-b3809e448aba@cisco.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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