drivers: wifi: Introduce SiWx91x WiFi driver

This driver allow to use Zephyr native IP stack or the IP stack provided
by HAL / WiseConnect.

The WiseConnect implementation may take advantage of the specific
features provided by the 917 (power consumption, speed,
validation...).

Some notable features are not available with this interface:
  - It seems Zephyr does not provide API to offload multicast membership
    management. User should be to directly call WiseConnect APIs
  - Support for ICMP frames is difficult. Note that WiseConnect
    automatically answer to ping request. It is just not possible to
    send ping requests and receive ping responses.
  - Zephyr and WiseConnect both support TLS offloading. However this
    patch does not implement it.
  - Reentrancy in the WiseConnect side is uncertain.

This implementation has been tested with samples/net/wifi/ (which relies
on subsys/net/lib/shell).

Signed-off-by: Jérôme Pouiller <[email protected]>

Author: jerome-pouiller

drivers/wifi/CMakeLists.txt

@@ -26,3 +26,4 @@ add_subdirectory_ifdef(CONFIG_WIFI_WINC1500     winc1500)
 add_subdirectory_ifdef(CONFIG_WIFI_NXP          nxp)
 add_subdirectory_ifdef(CONFIG_WIFI_AIROC        infineon)
 add_subdirectory_ifdef(CONFIG_WIFI_NRF70        nrf_wifi)
+add_subdirectory_ifdef(CONFIG_WIFI_SILABS_SIWX91X siwx91x)

drivers/wifi/Kconfig

@@ -43,5 +43,6 @@ source "drivers/wifi/esp32/Kconfig.esp32"
 source "drivers/wifi/nxp/Kconfig.nxp"
 source "drivers/wifi/infineon/Kconfig.airoc"
 source "drivers/wifi/nrf_wifi/Kconfig.nrfwifi"
+source "drivers/wifi/siwx91x/Kconfig.siwx91x"
 
 endif # WIFI

drivers/wifi/siwx91x/CMakeLists.txt

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2024 Silicon Laboratories Inc.
+
+if(CONFIG_WIFI_SILABS_SIWX91X)
+  zephyr_library_sources(siwx91x_wifi.c)
+
+  if(CONFIG_WIFI_SILABS_SIWX91X_NET_STACK_OFFLOAD)
+    zephyr_library_sources(siwx91x_wifi_socket.c)
+  endif()
+endif()

drivers/wifi/siwx91x/Kconfig.siwx91x

@@ -0,0 +1,48 @@
+# Copyright (c) 2024 Silicon Laboratories Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+config WIFI_SILABS_SIWX91X
+	bool "Silabs SiWx91x SoC series WiFi driver"
+	default y
+	depends on DT_HAS_SILABS_SIWX91X_WIFI_ENABLED
+	depends on NETWORKING
+	select WISECONNECT_NETWORK_STACK
+	select EVENTS
+	select NET_L2_WIFI_MGMT
+	help
+	  Enable WiFi driver for the Silabs SiWx91x SoC series.
+
+if WIFI_SILABS_SIWX91X
+
+choice
+	prompt "Network stack"
+	default WIFI_SILABS_SIWX91X_NET_STACK_NATIVE
+	help
+	  Choose "Native" stack if you want a better compatibility with Zephyr
+	  features. "Offloaded" stack may provide better resource (power and
+	  memory) consumption.
+
+config WIFI_SILABS_SIWX91X_NET_STACK_NATIVE
+	bool "Native"
+	select WIFI_USE_NATIVE_NETWORKING
+	select NET_L2_ETHERNET
+
+config WIFI_SILABS_SIWX91X_NET_STACK_OFFLOAD
+	bool "Offloaded"
+	select WIFI_OFFLOAD
+
+endchoice
+
+config NET_TCP_WORKQ_STACK_SIZE
+	default 2048
+
+config NET_RX_STACK_SIZE
+	default 2048
+
+config NET_MGMT_EVENT_STACK_SIZE
+	default 2048
+
+config NET_MGMT_EVENT_QUEUE_SIZE
+	default 10
+
+endif