Move random number generation to shim

Remove any Zephyr references in the BM code.

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>

Author: krish2718

nrf70_bm_lib/Kconfig

@@ -65,7 +65,6 @@ config NRF70_FIXED_MAC_ADDRESS_ENABLED
 
 config NRF70_RANDOM_MAC_ADDRESS
 	bool "Random MAC address generation at runtime"
-	select TEST_RANDOM_GENERATOR
 	help
 	  This option enables random MAC address generation at runtime.
 	  The random MAC address is generated using the libc srand() function.

nrf70_bm_lib/docs/source/nrf70_bm_porting_guide.rst

@@ -50,7 +50,7 @@ The reference implementation of the BM Driver for the Zephyr RTOS uses build-tim
   * - Pseudo-Random Number Generator (PRNG)
     - Used to generate random numbers for the nRF70 Series random MAC address generation,
       (if random MAC address generation support is enabled).
-    - NA
+    - nrf_wifi_osal_rand8_get()
     - sys_rand8_get()
 
 

nrf70_bm_lib/source/nrf70_bm_core.c

@@ -7,10 +7,6 @@
 /** @file
  * @brief nRF70 Bare Metal initialization.
  */
-#ifdef CONFIG_NRF70_RANDOM_MAC_ADDRESS
-#include <zephyr/random/random.h>
-#endif /* CONFIG_NRF70_RANDOM_MAC_ADDRESS */
-
 #include "nrf70_bm_lib.h"
 #include "nrf70_bm_core.h"
 
@@ -508,11 +504,12 @@ int nrf70_fmac_init(void)
 }
 
 #ifdef CONFIG_NRF70_RANDOM_MAC_ADDRESS
-static void generate_random_mac_address(uint8_t *mac_addr)
+static void generate_random_mac_address(void *opriv,
+					uint8_t *mac_addr)
 {
 	// For simplicty use Zephyr API to generate random number
 	for (int i = 0; i < 6; i++) {
-		mac_addr[i] = sys_rand8_get();
+		mac_addr[i] = nrf_wifi_osal_rand8_get(opriv);
 	}
 
 	// Set the locally administered bit (bit 1 of the first byte)
@@ -564,7 +561,7 @@ enum nrf_wifi_status nrf_wifi_get_mac_addr(struct nrf70_wifi_vif_bm *vif,
 
 	memcpy(vif->mac_addr, fixed_mac_addr, NR70_MAC_ADDR_LEN);
 #elif CONFIG_NRF70_RANDOM_MAC_ADDRESS
-	generate_random_mac_address(vif->mac_addr);
+	generate_random_mac_address(nrf70_bm_priv.fmac_priv->opriv, vif->mac_addr);
 #elif CONFIG_NRF70_OTP_MAC_ADDRESS
 	status = nrf_wifi_fmac_otp_mac_addr_get(rpu_ctx,
 											vif->vif_idx,

nrf70_zephyr_shim/Kconfig

@@ -10,6 +10,8 @@ DT_COMPAT_NORDIC_NRF700X_SPI := nordic,nrf700x-spi
 menuconfig NRF70_ZEPHYR_SHIM
   bool "Enable nRF70 Zephyr shim"
   default y if NRF70_BM_LIB
+  # For Random MAC address generation
+  select TEST_RANDOM_GENERATOR
   help
     Enable the nRF70 Zephyr shim.
 

nrf70_zephyr_shim/source/os/shim.c

@@ -18,6 +18,7 @@
 #include <zephyr/drivers/gpio.h>
 #include <zephyr/logging/log.h>
 #include <zephyr/sys/__assert.h>
+#include <zephyr/random/random.h>
 
 #include "rpu_hw_if.h"
 #include "shim.h"
@@ -972,6 +973,7 @@ static const struct nrf_wifi_osal_ops nrf_wifi_os_zep_ops = {
 
 	.assert = zep_shim_assert,
 	.strlen = zep_shim_strlen,
+	.rand8_get = sys_rand8_get,
 };
 
 const struct nrf_wifi_osal_ops *get_os_ops(void)