On Tue, 1 Jun 2021 at 17:08, Bryan O'Donoghue
[off-list ref] wrote:

In both cases using Wireshark we see the target system receive an ARP or
NS6 lookup and respond, followed by the host sending a ping or ping6 and
the target system coming out of suspend.

Similarly watching GTK keying on the AP when the device is in suspend, we
see the firmware successfully rekey and when we resume, the host picking up
the rekey material with persistence of the WiFi link during suspend/resume.

commit 5336fad96e8f ("wcn36xx: Enable firmware offloaded keepalive")
ensures that the link is kept alive in suspend, this additional set gives
the ability to

- Resolve ARP/NS6 lookups without waking the system
- Rekeying in suspend
- Suspending and resuming based on received datagram

https://git.linaro.org/people/bryan.odonoghue/kernel.git/log/?h=ath.master-wcn36xx-fw-offload-suspend-resume

Bryan O'Donoghue (12):
  wcn36xx: Return result of set_power_params in suspend
  wcn36xx: Run suspend for the first ieee80211_vif
  wcn36xx: Add ipv4 ARP offload support in suspend
  wcn36xx: Do not flush indication queue on suspend/resume
  wcn36xx: Add ipv6 address tracking
  wcn36xx: Add ipv6 namespace offload in suspend
  wcn36xx: Add set_rekey_data callback
  wcn36xx: Add GTK offload to WoWLAN path
  wcn36xx: Add GTK offload info to WoWLAN resume
  wcn36xx: Add Host suspend indication support
  wcn36xx: Add host resume request support
  wcn36xx: Enable WOWLAN flags

 drivers/net/wireless/ath/wcn36xx/hal.h     |  20 +-
 drivers/net/wireless/ath/wcn36xx/main.c    | 110 ++++++++-
 drivers/net/wireless/ath/wcn36xx/smd.c     | 265 +++++++++++++++++++++
 drivers/net/wireless/ath/wcn36xx/smd.h     |  17 ++
 drivers/net/wireless/ath/wcn36xx/wcn36xx.h |  14 ++
 5 files changed, 412 insertions(+), 14 deletions(-)

Reviewed-by: Loic Poulain <redacted>