[PATCH 0/2] net: qrtr: don't lose name server packets behind the HELLO gate

[Igor Opaniuk]

Since commit 544d85de4dc2 ("net: qrtr: Send HELLO message on endpoint
register") the core refuses every non-HELLO packet to a node until the
HELLO to it has been sent, and retries a HELLO that cannot be sent yet
100 ms later. A freshly booted remoteproc has no glink rx intents, so
the first HELLO fails, and the name server's announcements in that
window (the replies to the remote's HELLO and the NEW_SERVER broadcasts
of local servers) are dropped for good. The name server then also skips
the lookup notifications for a server whose broadcast failed.

On QCM2290 (Arduino UNO Q) this stalls the modem in about one boot in
five: it waits for the RMTFS service, which rmtfs registers in the same
instant the modem starts, until its watchdog fires 40 s later; WiFi,
whose firmware runs on the modem, comes up a minute late.

Patch 1 makes the name server carry on after a failed send (announce
the remaining servers, notify the pending lookups). Patch 2 holds
control packets for a node behind its HELLO and sends them right after
it, instead of dropping them; data packets are still refused before the
HELLO, so flow control is unchanged.

Initially tested on the Arduino UNO Q (QRB2210) with v7.3-rc6 plus the board
support it needs: 10 fresh boots and 10 modem stop/start cycles, no
"failed to announce new service", no modem watchdog, WLAN firmware up
6.4-8.2 s after boot every time; unpatched, 2/10 boots and 1/18 restarts
stalled. Built with W=1 on net/main; applies to next-20261016.

I'm not deeply familiar with QRTR; an alternative would be to have the
core trigger announce_servers() for the node once its HELLO is sent.
Happy to rework it that way if preferred.

Cc: Chris Lew <christopher.lew@xxxxxxxxxxxxxxxx>

---
Igor Opaniuk (2):
      net: qrtr: ns: keep going when an announcement cannot be sent
      net: qrtr: hold control packets behind the HELLO gate instead of dropping them

 net/qrtr/af_qrtr.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++-------
 net/qrtr/ns.c      | 10 +++++----
 2 files changed, 58 insertions(+), 11 deletions(-)
---
base-commit: 07bd391eb9572e74f073c49acef327611234f9bb
change-id: 20261019-upstream-qrtr-hello-gate-fix_b4-c2e8c2f4f906

Best regards,
--  
Igor Opaniuk <igor.opaniuk@xxxxxxxxxxxxxxxx>