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net: enetc: add MAC address filtering support for VFs of ENETC v4

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ENETC v4 VF hardware supports MAC address filtering, but the underlying
resources (the PSIPMMR register and per-SI hash filter tables) are owned
by the PF. Add VSI-to-PSI mailbox messages so a VF can request MAC
filter configuration from the PF, using two new command IDs under the
existing MAC filter class (0x20):

1. ENETC_MSG_SET_MAC_HASH_TABLE (cmd_id 3): program the unicast and/or
   multicast MAC hash filter table. Unicast filtering is only allowed for
   a trusted VF, since it could be used to receive traffic destined for
   other SIs. Multicast filtering is allowed even for an untrusted VF,
   but limited to ENETC_VF_MC_HASH_BITS_MAX (8) buckets, enough for basic
   operation such as IPv6 neighbor discovery and mDNS; a trusted VF may
   use all 64 buckets.

2. ENETC_MSG_SET_MAC_PROMISC_MODE (cmd_id 5): enable or disable unicast/
   multicast promiscuous mode, and optionally flush the hash filter
   table. Enabling promiscuous mode requires a trusted VF; flushing the
   table alone does not.

The PSIPMMR register is a shared resource accessed by both
enetc4_pf_set_rx_mode() and the VF message handler via a non-atomic
read-modify-write, so protect these accesses with si->gen_lock to avoid
lost updates on SMP.

When a VF loses trusted status via ndo_set_vf_trust(), clear its unicast
hash filter and disable promiscuous mode so it cannot receive traffic
beyond its allowed scope.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Link: https://patch.msgid.link/20260909100733.1139689-10-wei.fang@oss.nxp.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Wei Fang 2026-09-09 18:07:27 +08:00 • committed by Paolo Abeni
commit e7ac83644e
7 changed files with 300 additions and 35 deletions
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