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net: enetc: add PSI-to-VSI link status notification support for VF

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Let ENETC v4 VFs track PF link status through the PSI-to-VSI messaging
channel. Add two enetc_si_ops hooks, vf_reg_link_status_notifier and
vf_unreg_link_status_notifier, populated only in enetc4_vsi_ops; rev1
hardware is unaffected.

A dedicated MSI-X vector on the VF handles incoming PSI-to-VSI messages.
Its handler schedules a work item on an ordered workqueue that reads the
notification via VSIMSGRR, updates the carrier state and sets congestion
mode from the PF TX PAUSE state in the message. Reading VSIMSGRR also
acknowledges the PF so it can send the next message. The workqueue is
set up in enetc_vf_probe() and torn down in enetc_vf_remove().

On a VF, enetc_phylink_connect() registers the notifier with the PF and
enetc_close() unregisters it. On registration the PF immediately sends
the current link status and then broadcasts every later transition; if
registration fails, fall back to the LS1028A behaviour and assert
carrier unconditionally. Register the notifier only after the Tx/Rx
resources are allocated in enetc_open(), because once registered the PF
may queue si->msg_task via a link-up message. An error unwind cannot
drain that work item, since enetc_open() and the work item both take the
RTNL lock and waiting would deadlock; and as __LINK_STATE_START is set
before ndo_open() runs, netif_running() stays true during the unwind, so
the queued work could still call netif_carrier_on() and leave carrier
'on' after a failed open.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Link: https://patch.msgid.link/20260909100733.1139689-15-wei.fang@oss.nxp.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Wei Fang 2026-09-09 18:07:32 +08:00 • committed by Paolo Abeni
commit 36a16ed591
4 changed files with 261 additions and 9 deletions
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