raulcxw opened a new pull request, #19353:
URL: https://github.com/apache/nuttx/pull/19353
## Summary
* Migrate the Ameba WHC WiFi driver (RTL8721Dx / RTL8720F) from the
legacy
flat `net_driver_s` model to the netdev **lower-half** framework
(`netdev_lowerhalf_s` + `netdev_ops_s`, IOB/netpkt quota backpressure
and a
dedicated RX thread). This gives real TX backpressure and moves RX off
the
IPC callback onto a bounded queue. See
`Documentation/components/net/netdriver.rst`.
* Raise the host TX skb pool (`skb_num_ap`) to a minimum of 16: the SDK
default of 4 starves sustained TCP TX (host send `-2`, retransmit
exhaustion, connection abort with ENOTCONN).
* Enable `CONFIG_NET_TCP_SELECTIVE_ACK` (which selects OUT_OF_ORDER) in
both
board defconfigs. WiFi's occasional loss otherwise stalls TCP RX on RTO
timeouts (~1-2 Mbit/s); with SACK it recovers to double-digit Mbit/s.
* Register `wlan0` synchronously on the board bring-up path (it was
created on
a kthread, so the netdev appeared only after netinit's one-shot
associate had
run -> no boot auto-connect). Enable the standard netinit machinery in
both
defconfigs: `NETINIT_THREAD`, `NETINIT_DHCPC`, and placeholder
`NETINIT_WAPI_SSID/PASSPHRASE` the user replaces (or overrides at
runtime
with `wapi`). `WIRELESS_WAPI` + the wapi cmdtool are already enabled.
## Impact
* Is new feature added / existing changed? YES — WiFi netdev now uses the
lower-half framework; boards auto-connect on boot when credentials are
set.
* Impact on user? YES (minor) — set `NETINIT_WAPI_SSID/PASSPHRASE`
(placeholders
shipped) or use `wapi` at runtime. No API change.
* Impact on build? NO (driver + config only).
* Impact on hardware? YES — arch/arm RTL8721Dx + RTL8720F WHC WiFi
driver and
both board defconfigs.
* Impact on documentation? NO (follows existing netdriver.rst).
* Impact on security? NO — only placeholder credentials are committed.
* Impact on compatibility? NO (self-contained to the Ameba arch/boards).
## Testing
Build Host: Ubuntu (WSL2), x86_64; Realtek asdk arm-none-eabi-gcc
auto-fetched.
Targets: `rtl8720f_evb:nsh` (RTL8720F), `pke8721daf:nsh` (RTL8721Dx).
Environment: open-space RF — throughput fluctuates mid-run due to
interference
and retransmission; the low samples are environmental, not a regression.
Boot + auto-connect (RTL8720F, credentials set in local .config):
```
[ameba-wifi] ameba_wifi_start -> 0
[ameba-wifi] ameba_wlan_initialize -> 0
NuttShell (NSH) NuttX-13.0.0-RC0
nsh> [ameba-wifi] connecting to "<ssid>" ...
[WLAN-A] assoc success(2)
[$]wifi connected
```
Placeholder behaviour + runtime override (RTL8721Dx, shipped defconfig):
```
nsh> [ameba-wifi] connecting to "YOUR_WIFI_SSID" ...
[ameba-wifi] connect failed: -4108
nsh> wapi psk wlan0 <pass> 3
nsh> wapi essid wlan0 <ssid> 1
[$]wifi connected
nsh> ifconfig
wlan0 ... inet addr:192.168.x.x
```
iperf after change (before SACK, RTL8721Dx TCP RX stalled at ~1-2
Mbit/s):
```
RTL8720F:
TCP RX (iperf -s): ~13 Mbit/s (peak 16.3), interference dips
TCP TX (iperf -c): 15.05 Mbit/s (0-30s avg)
UDP RX (iperf -s -u): ~26 Mbit/s
UDP TX (iperf -c -u): 54.91 Mbit/s (0-30s avg)
RTL8721Dx (weaker open-space signal):
TCP RX (iperf -s): ~5 Mbit/s (4-9 range)
TCP TX (iperf -c): 10.76 Mbit/s (0-30s avg)
UDP RX (iperf -s -u): ~12-17 Mbit/s
UDP TX (iperf -c -u): 18.64 Mbit/s (0-30s avg)
```
## PR verification Self-Check
* [x] This PR introduces one functional change (Ameba WHC WiFi
networking).
* [x] I have updated all required description fields above.
* [x] My PR adheres to Contributing Guidelines (checkpatch passes, no
long lines).
* [ ] My PR is still work in progress (not ready for review).
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