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net: enetc: add trusted VF support

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Some mailbox messages require a higher privilege level to be executed
on behalf of the requesting VF. Introduce a trusted VF flag
(ENETC_VF_FLAG_TRUSTED) and wire up the ndo_set_vf_trust callback via
enetc_pf_set_vf_trust(), which is shared between the enetc and enetc4
PF drivers.

Trust is a PF/host-side policy bound to the VF index, decoupled from
whether SR-IOV is enabled. It may be set on a slot before SR-IOV is
enabled so a trusted VF can apply configuration right at init time,
and it is intentionally preserved across an SR-IOV disable/enable
cycle. The bounds check uses pf->total_vfs, the hardware maximum and
the size of pf->vf_state[], so pre-configuring an uninstantiated slot
is in-bounds. If a slot may be reassigned to another guest, the admin
clears trust with "ip link set <dev> vf <N> trust off".

The first message gated on trust is the VF primary MAC address change.
An untrusted VF that attempts to set its own MAC address will receive a
ENETC_MSG_CLASS_ID_PERMISSION_DENY response and the hardware will not be
programmed. This prevents a malicious VM from setting the VF address to
the MAC address of other VFs or the PF and eavesdropping on the traffic
of other SIs, and it stops a malicious VM from arbitrarily changing the
VF MAC address to achieve MAC address spoofing and bypass security
policies. This does not regress VF bring-up. The PF programs a valid
primary MAC into every VF slot at probe, and the VF loads it from its
own SIPMAR0/1 registers.

Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Signed-off-by: Wei Fang <wei.fang@nxp.com>
Link: https://patch.msgid.link/20260909100733.1139689-2-wei.fang@oss.nxp.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Claudiu Manoil 2026-09-09 18:07:19 +08:00 • committed by Paolo Abeni
commit aeb505f83f
6 changed files with 61 additions and 10 deletions
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