[lwip-devel] [PATCHv6 02/14] net/lwip: integrate lwIP library

[Maxim Uvarov]

Define Makefile and Kconfig to build lwIP inside the U-Boot. We compile
lwIP the same as the main code, plus we can do optimization for size at
compile time with disabling not needed debug asserts, or not used protocols.
So we can tune lwIP configuration specially for U-Boot environments.

Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>
---
 net/Kconfig       |  3 +++
 net/Makefile      |  1 +
 net/lwip/Kconfig  | 60 ++++++++++++++++++++++++++++++++++++++++++
 net/lwip/Makefile | 66 +++++++++++++++++++++++++++++++++++++++++++++++
 net/net.c         | 20 ++++++++++++++
 5 files changed, 150 insertions(+)
 create mode 100644 net/lwip/Kconfig
 create mode 100644 net/lwip/Makefile

diff --git a/net/Kconfig b/net/Kconfig
index 4215889127..34c1e43c87 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -5,9 +5,12 @@
 menuconfig NET
        bool "Networking support"
        default y
+       imply LWIP
 
 if NET
 
+source net/lwip/Kconfig
+
 config ARP_TIMEOUT
        int "Milliseconds before trying ARP again"
        default 5000
diff --git a/net/Makefile b/net/Makefile
index 3e2d061338..61930c244e 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_CMD_WOL)  += wol.o
 obj-$(CONFIG_PROT_UDP) += udp.o
 obj-$(CONFIG_PROT_TCP) += tcp.o
 obj-$(CONFIG_CMD_WGET) += wget.o
+obj-$(CONFIG_LWIP) += lwip/
 
 # Disable this warning as it is triggered by:
 # sprintf(buf, index ? "foo%d" : "foo", index)
diff --git a/net/lwip/Kconfig b/net/lwip/Kconfig
new file mode 100644
index 0000000000..233c6c532d
--- /dev/null
+++ b/net/lwip/Kconfig
@@ -0,0 +1,60 @@
+menu "LWIP"
+config LWIP
+       bool "Support LWIP library"
+       help
+          Enable the lwIP library code with
+          all dependencies (cmd commands implemented with lwIP
+          library. This option is automatically enabled if CONFIG_NET=y.
+         lwIP library (https://git.savannah.nongnu.org/git/lwip.git) provides
+          network stack and application code for U-Boot cmd commands.
+         Please see doc/develop/net_lwip.rst for more details.
+
+menu "LWIP options"
+
+config LWIP_LIB_DEBUG
+       bool "enable debug"
+       default n
+
+config LWIP_LIB_NOASSERT
+       bool "disable asserts"
+       default y
+       help
+           Disabling asserts reduces binary size by 16k.
+
+config LWIP_LIB_TCP
+        bool "tcp"
+        default y
+       help
+          Compile lwIP with TCP protocol support.
+
+config LWIP_LIB_UDP
+        bool "udp"
+        default y
+       help
+          Compile lwIP with UDP protocol support (needed for TFTP).
+
+config LWIP_LIB_DNS
+        bool "dns"
+        default y
+       help
+          Compile lwIP with DNS protocol support.
+
+config LWIP_LIB_DHCP
+        bool "dhcp"
+        default y
+       help
+          Compile lwIP with DHCP protocol support.
+
+config LWIP_LIB_LOOPBACK
+        bool "loopback"
+        help
+          Increases size by 1k.
+       help
+          Compile lwIP with loopback interface support.
+
+config LWIP_LIB_SOCKET
+        bool "socket API"
+
+endmenu
+
+endmenu
diff --git a/net/lwip/Makefile b/net/lwip/Makefile
new file mode 100644
index 0000000000..d1161bea78
--- /dev/null
+++ b/net/lwip/Makefile
@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2023 Linaro Ltd. <maxim.uvarov@linaro.org>
+
+LWIPDIR=lwip-external/src
+
+ccflags-y += -I$(srctree)/net/lwip/port/include
+ccflags-y += -I$(srctree)/net/lwip/lwip-external/src/include 
-I$(srctree)/net/lwip
+
+obj-$(CONFIG_NET) += $(LWIPDIR)/core/init.o \
+       $(LWIPDIR)/core/def.o \
+       $(LWIPDIR)/core/dns.o \
+       $(LWIPDIR)/core/inet_chksum.o \
+       $(LWIPDIR)/core/ip.o \
+       $(LWIPDIR)/core/mem.o \
+       $(LWIPDIR)/core/memp.o \
+       $(LWIPDIR)/core/netif.o \
+       $(LWIPDIR)/core/pbuf.o \
+       $(LWIPDIR)/core/raw.o \
+       $(LWIPDIR)/core/stats.o \
+       $(LWIPDIR)/core/sys.o \
+       $(LWIPDIR)/core/altcp.o \
+       $(LWIPDIR)/core/altcp_alloc.o \
+       $(LWIPDIR)/core/altcp_tcp.o \
+       $(LWIPDIR)/core/tcp.o \
+       $(LWIPDIR)/core/tcp_in.o \
+       $(LWIPDIR)/core/tcp_out.o \
+       $(LWIPDIR)/core/timeouts.o \
+       $(LWIPDIR)/core/udp.o
+
+# IPv4
+obj-$(CONFIG_NET) += $(LWIPDIR)/core/ipv4/acd.o \
+        $(LWIPDIR)/core/ipv4/autoip.o \
+        $(LWIPDIR)/core/ipv4/dhcp.o \
+        $(LWIPDIR)/core/ipv4/etharp.o \
+        $(LWIPDIR)/core/ipv4/icmp.o \
+        $(LWIPDIR)/core/ipv4/igmp.o \
+        $(LWIPDIR)/core/ipv4/ip4_frag.o \
+        $(LWIPDIR)/core/ipv4/ip4.o \
+        $(LWIPDIR)/core/ipv4/ip4_addr.o
+# IPv6
+obj-$(CONFIG_NET) += $(LWIPDIR)/core/ipv6/dhcp6.o \
+        $(LWIPDIR)/core/ipv6/ethip6.o \
+        $(LWIPDIR)/core/ipv6/icmp6.o \
+        $(LWIPDIR)/core/ipv6/inet6.o \
+        $(LWIPDIR)/core/ipv6/ip6.o \
+        $(LWIPDIR)/core/ipv6/ip6_addr.o \
+        $(LWIPDIR)/core/ipv6/ip6_frag.o \
+        $(LWIPDIR)/core/ipv6/mld6.o \
+        $(LWIPDIR)/core/ipv6/nd6.o
+# API
+obj-$(CONFIG_NET) += $(LWIPDIR)/api/api_lib.o \
+       $(LWIPDIR)/api/api_msg.o \
+       $(LWIPDIR)/api/err.o \
+       $(LWIPDIR)/api/if_api.o \
+       $(LWIPDIR)/api/netbuf.o \
+       $(LWIPDIR)/api/netdb.o \
+       $(LWIPDIR)/api/netifapi.o \
+       $(LWIPDIR)/api/sockets.o \
+       $(LWIPDIR)/api/tcpip.o
+
+# Netdevs
+obj-$(CONFIG_NET) += $(LWIPDIR)/netif/ethernet.o
+
+obj-$(CONFIG_NET) += port/if.o
+obj-$(CONFIG_NET) += port/sys-arch.o
diff --git a/net/net.c b/net/net.c
index 43abbac7c3..7f868ee516 100644
--- a/net/net.c
+++ b/net/net.c
@@ -125,6 +125,7 @@
 #endif
 #include "dhcpv6.h"
 #include "net_rand.h"
+#include <net/ulwip.h>
 
 /** BOOTP EXTENTIONS **/
 
@@ -452,7 +453,11 @@ int net_loop(enum proto_t protocol)
 #endif
 
        bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
+#if defined(CONFIG_LWIP)
+       if (!ulwip_enabled() || !ulwip_in_loop())
+#endif
        net_init();
+
        if (eth_is_on_demand_init()) {
                eth_halt();
                eth_set_current();
@@ -649,6 +654,16 @@ restart:
                 */
                eth_rx();
 
+               if (IS_ENABLED(CONFIG_LWIP) && ulwip_enabled()) {
+                       net_set_state(NETLOOP_CONTINUE);
+                       if (!ulwip_in_loop()) {
+                               if (ulwip_app_get_err())
+                                       net_set_state(NETLOOP_FAIL);
+                               else
+                                       net_set_state(NETLOOP_SUCCESS);
+                               goto done;
+                       }
+               }
                /*
                 *      Abort if ctrl-c was pressed.
                 */
@@ -1213,6 +1228,11 @@ void net_process_received_packet(uchar *in_packet, int 
len)
        if (len < ETHER_HDR_SIZE)
                return;
 
+       if (IS_ENABLED(CONFIG_LWIP) && ulwip_enabled()) {
+               ulwip_poll();
+               return;
+       }
+
 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
        if (push_packet) {
                (*push_packet)(in_packet, len);
-- 
2.30.2