[nrf fromtree] net: Avoid compiling native network stack parts w/o NET_NATIVE

In case NET_NATIVE is disabled, certain network stack components do not
need to be compiled. Otherwise, they could throw errors if
--no-gc-sections compiler options is enabled.

Signed-off-by: Robert Lubos <[email protected]>
(cherry picked from commit 2e1d896)

Author: rlubos

include/zephyr/net/net_if.h

@@ -1827,15 +1827,33 @@ bool net_if_ipv6_router_rm(struct net_if_router *router);
  *
  * @return Hop limit
  */
+#if defined(CONFIG_NET_NATIVE_IPV6)
 uint8_t net_if_ipv6_get_hop_limit(struct net_if *iface);
+#else
+static inline uint8_t net_if_ipv6_get_hop_limit(struct net_if *iface)
+{
+	ARG_UNUSED(iface);
+
+	return 0;
+}
+#endif /* CONFIG_NET_NATIVE_IPV6 */
 
 /**
  * @brief Set the default IPv6 hop limit of a given interface.
  *
  * @param iface Network interface
  * @param hop_limit New hop limit
  */
+#if defined(CONFIG_NET_NATIVE_IPV6)
 void net_if_ipv6_set_hop_limit(struct net_if *iface, uint8_t hop_limit);
+#else
+static inline void net_if_ipv6_set_hop_limit(struct net_if *iface,
+					     uint8_t hop_limit)
+{
+	ARG_UNUSED(iface);
+	ARG_UNUSED(hop_limit);
+}
+#endif /* CONFIG_NET_NATIVE_IPV6 */
 
 /** @cond INTERNAL_HIDDEN */
 
@@ -1860,15 +1878,33 @@ static inline void net_ipv6_set_hop_limit(struct net_if *iface,
  *
  * @return Hop limit
  */
+#if defined(CONFIG_NET_NATIVE_IPV6)
 uint8_t net_if_ipv6_get_mcast_hop_limit(struct net_if *iface);
+#else
+static inline uint8_t net_if_ipv6_get_mcast_hop_limit(struct net_if *iface)
+{
+	ARG_UNUSED(iface);
+
+	return 0;
+}
+#endif /* CONFIG_NET_NATIVE_IPV6 */
 
 /**
  * @brief Set the default IPv6 multicast hop limit of a given interface.
  *
  * @param iface Network interface
  * @param hop_limit New hop limit
  */
+#if defined(CONFIG_NET_NATIVE_IPV6)
 void net_if_ipv6_set_mcast_hop_limit(struct net_if *iface, uint8_t hop_limit);
+#else
+static inline void net_if_ipv6_set_mcast_hop_limit(struct net_if *iface,
+						   uint8_t hop_limit)
+{
+	ARG_UNUSED(iface);
+	ARG_UNUSED(hop_limit);
+}
+#endif /* CONFIG_NET_NATIVE_IPV6 */
 
 /**
  * @brief Set IPv6 reachable time for a given interface

subsys/net/ip/net_context.c

@@ -2456,7 +2456,7 @@ enum net_verdict net_context_packet_received(struct net_conn *conn,
 	return verdict;
 }
 
-#if defined(CONFIG_NET_UDP)
+#if defined(CONFIG_NET_NATIVE_UDP)
 static int recv_udp(struct net_context *context,
 		    net_context_recv_cb_t cb,
 		    k_timeout_t timeout,
@@ -2538,7 +2538,7 @@ static int recv_udp(struct net_context *context,
 }
 #else
 #define recv_udp(...) 0
-#endif /* CONFIG_NET_UDP */
+#endif /* CONFIG_NET_NATIVE_UDP */
 
 static enum net_verdict net_context_raw_packet_received(
 					struct net_conn *conn,

subsys/net/ip/net_core.c

@@ -60,6 +60,7 @@ LOG_MODULE_REGISTER(net_core, CONFIG_NET_CORE_LOG_LEVEL);
 
 #include "net_stats.h"
 
+#if defined(CONFIG_NET_NATIVE)
 static inline enum net_verdict process_data(struct net_pkt *pkt,
 					    bool is_loopback)
 {
@@ -188,22 +189,6 @@ static void net_post_init(void)
 #endif
 }
 
-static void init_rx_queues(void)
-{
-	/* Starting TX side. The ordering is important here and the TX
-	 * can only be started when RX side is ready to receive packets.
-	 */
-	net_if_init();
-
-	net_tc_rx_init();
-
-	/* This will take the interface up and start everything. */
-	net_if_post_init();
-
-	/* Things to init after network interface is working */
-	net_post_init();
-}
-
 static inline void copy_ll_addr(struct net_pkt *pkt)
 {
 	memcpy(net_pkt_lladdr_src(pkt), net_pkt_lladdr_if(pkt),
@@ -571,6 +556,39 @@ static inline void l3_init(void)
 
 	NET_DBG("Network L3 init done");
 }
+#else /* CONFIG_NET_NATIVE */
+#define l3_init(...)
+#define net_post_init(...)
+int net_send_data(struct net_pkt *pkt)
+{
+	ARG_UNUSED(pkt);
+
+	return -ENOTSUP;
+}
+int net_recv_data(struct net_if *iface, struct net_pkt *pkt)
+{
+	ARG_UNUSED(iface);
+	ARG_UNUSED(pkt);
+
+	return -ENOTSUP;
+}
+#endif /* CONFIG_NET_NATIVE */
+
+static void init_rx_queues(void)
+{
+	/* Starting TX side. The ordering is important here and the TX
+	 * can only be started when RX side is ready to receive packets.
+	 */
+	net_if_init();
+
+	net_tc_rx_init();
+
+	/* This will take the interface up and start everything. */
+	net_if_post_init();
+
+	/* Things to init after network interface is working */
+	net_post_init();
+}
 
 static inline int services_init(void)
 {

subsys/net/ip/net_if.c

@@ -174,6 +174,7 @@ struct net_if *z_vrfy_net_if_get_by_index(int index)
 #include <zephyr/syscalls/net_if_get_by_index_mrsh.c>
 #endif
 
+#if defined(CONFIG_NET_NATIVE)
 static inline void net_context_send_cb(struct net_context *context,
 				       int status)
 {
@@ -382,6 +383,7 @@ void net_if_queue_tx(struct net_if *iface, struct net_pkt *pkt)
 			;
 	}
 }
+#endif /* CONFIG_NET_NATIVE */
 
 void net_if_stats_reset(struct net_if *iface)
 {
@@ -445,6 +447,7 @@ static inline void init_iface(struct net_if *iface)
 	net_ipv6_pe_init(iface);
 }
 
+#if defined(CONFIG_NET_NATIVE)
 enum net_verdict net_if_send_data(struct net_if *iface, struct net_pkt *pkt)
 {
 	const struct net_l2 *l2;
@@ -551,6 +554,7 @@ enum net_verdict net_if_send_data(struct net_if *iface, struct net_pkt *pkt)
 
 	return verdict;
 }
+#endif /* CONFIG_NET_NATIVE */
 
 int net_if_set_link_addr_locked(struct net_if *iface,
 				uint8_t *addr, uint8_t len,

subsys/net/ip/utils.c

@@ -634,7 +634,7 @@ static inline uint16_t pkt_calc_chksum(struct net_pkt *pkt, uint16_t sum)
 	return sum;
 }
 
-#if defined(CONFIG_NET_IP)
+#if defined(CONFIG_NET_NATIVE_IP)
 uint16_t net_calc_chksum(struct net_pkt *pkt, uint8_t proto)
 {
 	size_t len = 0U;
@@ -684,7 +684,7 @@ uint16_t net_calc_chksum(struct net_pkt *pkt, uint8_t proto)
 }
 #endif
 
-#if defined(CONFIG_NET_IPV4)
+#if defined(CONFIG_NET_NATIVE_IPV4)
 uint16_t net_calc_chksum_ipv4(struct net_pkt *pkt)
 {
 	uint16_t sum;
@@ -697,7 +697,7 @@ uint16_t net_calc_chksum_ipv4(struct net_pkt *pkt)
 
 	return ~sum;
 }
-#endif /* CONFIG_NET_IPV4 */
+#endif /* CONFIG_NET_NATIVE_IPV4 */
 
 #if defined(CONFIG_NET_IPV4_IGMP)
 uint16_t net_calc_chksum_igmp(struct net_pkt *pkt)