net-lwip: build lwIP

Build the lwIP library when NET_LWIP is enabled. The following files
are adaptation layers written specially for U-Boot:

 lib/lwip/u-boot/arch/cc.h
 lib/lwip/u-boot/arch/sys_arch.h (empty)
 lib/lwip/u-boot/limits.h (empty)
 lib/lwip/u-boot/lwipopts.h

They were initially contributed by Maxim in a previous RFC patch series.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Co-developed-by: Maxim Uvarov <muvarov@gmail.com>
Cc: Maxim Uvarov <muvarov@gmail.com>

7 files changed, 301 insertions, 1 deletions

diff --git a/lib/Makefile b/lib/Makefile
index 2a76acf..c35786a 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -94,6 +94,8 @@ obj-$(CONFIG_LIBAVB) += libavb/
 obj-$(CONFIG_$(SPL_TPL_)OF_LIBFDT) += libfdt/
 obj-$(CONFIG_$(SPL_TPL_)OF_REAL) += fdtdec_common.o fdtdec.o
 
+obj-$(CONFIG_NET_LWIP) += lwip/
+
 ifdef CONFIG_SPL_BUILD
 obj-$(CONFIG_SPL_YMODEM_SUPPORT) += crc16-ccitt.o
 obj-$(CONFIG_$(SPL_TPL_)HASH) += crc16-ccitt.o
diff --git a/lib/lwip/Makefile b/lib/lwip/Makefile
new file mode 100644
index 0000000..158e59b
--- /dev/null
+++ b/lib/lwip/Makefile
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2024 Linaro Ltd.
+
+ccflags-y += -I$(srctree)/lib/lwip/lwip/src/include -I$(srctree)/lib/lwip/u-boot
+
+obj-y += \
+	lwip/src/api/api_lib.o \
+	lwip/src/api/api_msg.o \
+	lwip/src/api/err.o \
+	lwip/src/api/if_api.o \
+	lwip/src/api/netbuf.o \
+	lwip/src/api/netdb.o \
+	lwip/src/api/netifapi.o \
+	lwip/src/api/sockets.o \
+	lwip/src/api/tcpip.o \
+	lwip/src/apps/http/http_client.o \
+	lwip/src/apps/tftp/tftp.o \
+	lwip/src/core/altcp_alloc.o \
+	lwip/src/core/altcp.o \
+	lwip/src/core/altcp_tcp.o \
+	lwip/src/core/def.o \
+	lwip/src/core/dns.o \
+	lwip/src/core/inet_chksum.o \
+	lwip/src/core/init.o \
+	lwip/src/core/ip.o \
+	lwip/src/core/ipv4/acd.o \
+	lwip/src/core/ipv4/autoip.o \
+	lwip/src/core/ipv4/dhcp.o \
+	lwip/src/core/ipv4/etharp.o \
+	lwip/src/core/ipv4/icmp.o \
+	lwip/src/core/ipv4/igmp.o \
+	lwip/src/core/ipv4/ip4_addr.o \
+	lwip/src/core/ipv4/ip4.o \
+	lwip/src/core/ipv4/ip4_frag.o \
+	lwip/src/core/ipv6/dhcp6.o \
+	lwip/src/core/ipv6/ethip6.o \
+	lwip/src/core/ipv6/icmp6.o \
+	lwip/src/core/ipv6/inet6.o \
+	lwip/src/core/ipv6/ip6_addr.o \
+	lwip/src/core/ipv6/ip6.o \
+	lwip/src/core/ipv6/ip6_frag.o \
+	lwip/src/core/ipv6/mld6.o \
+	lwip/src/core/ipv6/nd6.o \
+	lwip/src/core/mem.o \
+	lwip/src/core/memp.o \
+	lwip/src/core/netif.o \
+	lwip/src/core/pbuf.o \
+	lwip/src/core/raw.o \
+	lwip/src/core/stats.o \
+	lwip/src/core/sys.o \
+	lwip/src/core/tcp.o \
+	lwip/src/core/tcp_in.o \
+	lwip/src/core/tcp_out.o \
+	lwip/src/core/timeouts.o \
+	lwip/src/core/udp.o \
+	lwip/src/netif/ethernet.o
diff --git a/lib/lwip/u-boot/arch/cc.h b/lib/lwip/u-boot/arch/cc.h
new file mode 100644
index 0000000..31c036d
--- /dev/null
+++ b/lib/lwip/u-boot/arch/cc.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2023 Linaro Ltd. <maxim.uvarov@linaro.org> */
+
+#ifndef LWIP_ARCH_CC_H
+#define LWIP_ARCH_CC_H
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <vsprintf.h>
+#include <rand.h>
+
+#define LWIP_ERRNO_INCLUDE <errno.h>
+
+#define LWIP_ERRNO_STDINCLUDE	1
+#define LWIP_NO_UNISTD_H 1
+#define LWIP_TIMEVAL_PRIVATE 1
+
+#ifdef CONFIG_LIB_RAND
+#define LWIP_RAND() ((u32_t)rand())
+#endif
+
+/* different handling for unit test, normally not needed */
+#ifdef LWIP_NOASSERT_ON_ERROR
+#define LWIP_ERROR(message, expression, handler) do { if (!(expression)) { \
+						handler; }} while (0)
+#endif
+
+#define LWIP_DONT_PROVIDE_BYTEORDER_FUNCTIONS
+
+#define LWIP_PLATFORM_ASSERT(x) do {printf("Assertion \"%s\" failed at line %d in %s\n", \
+				    x, __LINE__, __FILE__); } while (0)
+
+#define atoi(str) (int)dectoul(str, NULL)
+#define lwip_strnstr(a, b)  strnstr(a, b)
+
+#define LWIP_ERR_T int
+#define LWIP_CONST_CAST(target_type, val) ((target_type)((uintptr_t)val))
+
+#if defined(CONFIG_SYS_BIG_ENDIAN)
+#define BYTE_ORDER BIG_ENDIAN
+#endif
+
+#endif /* LWIP_ARCH_CC_H */
diff --git a/lib/lwip/u-boot/arch/sys_arch.h b/lib/lwip/u-boot/arch/sys_arch.h
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/lib/lwip/u-boot/arch/sys_arch.h
diff --git a/lib/lwip/u-boot/limits.h b/lib/lwip/u-boot/limits.h
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/lib/lwip/u-boot/limits.h
diff --git a/lib/lwip/u-boot/lwipopts.h b/lib/lwip/u-boot/lwipopts.h
new file mode 100644
index 0000000..aac0a62
--- /dev/null
+++ b/lib/lwip/u-boot/lwipopts.h
@@ -0,0 +1,197 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+/* Copyright (C) 2023 Linaro Ltd. <maxim.uvarov@linaro.org> */
+
+#ifndef LWIP_UBOOT_LWIPOPTS_H
+#define LWIP_UBOOT_LWIPOPTS_H
+
+#if defined(CONFIG_LWIP_DEBUG)
+#define LWIP_DEBUG 1
+#define LWIP_DBG_MIN_LEVEL              LWIP_DBG_LEVEL_ALL
+#define LWIP_DBG_TYPES_ON               LWIP_DBG_ON
+#define ETHARP_DEBUG                    LWIP_DBG_ON
+#define NETIF_DEBUG                     LWIP_DBG_ON
+#define PBUF_DEBUG                      LWIP_DBG_OFF
+#define API_LIB_DEBUG                   LWIP_DBG_ON
+#define API_MSG_DEBUG                   LWIP_DBG_OFF
+#define SOCKETS_DEBUG                   LWIP_DBG_OFF
+#define ICMP_DEBUG                      LWIP_DBG_OFF
+#define IGMP_DEBUG                      LWIP_DBG_OFF
+#define INET_DEBUG                      LWIP_DBG_OFF
+#define IP_DEBUG                        LWIP_DBG_ON
+#define IP_REASS_DEBUG                  LWIP_DBG_OFF
+#define RAW_DEBUG                       LWIP_DBG_OFF
+#define MEM_DEBUG                       LWIP_DBG_OFF
+#define MEMP_DEBUG                      LWIP_DBG_OFF
+#define SYS_DEBUG                       LWIP_DBG_OFF
+#define TIMERS_DEBUG                    LWIP_DBG_ON
+#define TCP_DEBUG                       LWIP_DBG_OFF
+#define TCP_INPUT_DEBUG                 LWIP_DBG_OFF
+#define TCP_FR_DEBUG                    LWIP_DBG_OFF
+#define TCP_RTO_DEBUG                   LWIP_DBG_OFF
+#define TCP_CWND_DEBUG                  LWIP_DBG_OFF
+#define TCP_WND_DEBUG                   LWIP_DBG_OFF
+#define TCP_OUTPUT_DEBUG                LWIP_DBG_OFF
+#define TCP_RST_DEBUG                   LWIP_DBG_OFF
+#define TCP_QLEN_DEBUG                  LWIP_DBG_OFF
+#define UDP_DEBUG                       LWIP_DBG_OFF
+#define TCPIP_DEBUG                     LWIP_DBG_OFF
+#define SLIP_DEBUG                      LWIP_DBG_OFF
+#define DHCP_DEBUG                      LWIP_DBG_ON
+#define AUTOIP_DEBUG                    LWIP_DBG_ON
+#define DNS_DEBUG                       LWIP_DBG_ON
+#define IP6_DEBUG                       LWIP_DBG_OFF
+#define DHCP6_DEBUG                     LWIP_DBG_OFF
+#else
+#define LWIP_DBG_MIN_LEVEL              LWIP_DBG_LEVEL_ALL
+#define LWIP_DBG_TYPES_ON               LWIP_DBG_OFF
+#define ETHARP_DEBUG                    LWIP_DBG_OFF
+#define NETIF_DEBUG                     LWIP_DBG_OFF
+#define PBUF_DEBUG                      LWIP_DBG_OFF
+#define API_LIB_DEBUG                   LWIP_DBG_OFF
+#define API_MSG_DEBUG                   LWIP_DBG_OFF
+#define SOCKETS_DEBUG                   LWIP_DBG_OFF
+#define ICMP_DEBUG                      LWIP_DBG_OFF
+#define IGMP_DEBUG                      LWIP_DBG_OFF
+#define INET_DEBUG                      LWIP_DBG_OFF
+#define IP_DEBUG                        LWIP_DBG_OFF
+#define IP_REASS_DEBUG                  LWIP_DBG_OFF
+#define RAW_DEBUG                       LWIP_DBG_OFF
+#define MEM_DEBUG                       LWIP_DBG_OFF
+#define MEMP_DEBUG                      LWIP_DBG_OFF
+#define SYS_DEBUG                       LWIP_DBG_OFF
+#define TIMERS_DEBUG                    LWIP_DBG_OFF
+#define TCP_DEBUG                       LWIP_DBG_OFF
+#define TCP_INPUT_DEBUG                 LWIP_DBG_OFF
+#define TCP_FR_DEBUG                    LWIP_DBG_OFF
+#define TCP_RTO_DEBUG                   LWIP_DBG_OFF
+#define TCP_CWND_DEBUG                  LWIP_DBG_OFF
+#define TCP_WND_DEBUG                   LWIP_DBG_OFF
+#define TCP_OUTPUT_DEBUG                LWIP_DBG_OFF
+#define TCP_RST_DEBUG                   LWIP_DBG_OFF
+#define TCP_QLEN_DEBUG                  LWIP_DBG_OFF
+#define UDP_DEBUG                       LWIP_DBG_OFF
+#define TCPIP_DEBUG                     LWIP_DBG_OFF
+#define SLIP_DEBUG                      LWIP_DBG_OFF
+#define DHCP_DEBUG                      LWIP_DBG_OFF
+#define AUTOIP_DEBUG                    LWIP_DBG_OFF
+#define DNS_DEBUG                       LWIP_DBG_OFF
+#define IP6_DEBUG                       LWIP_DBG_OFF
+#define DHCP6_DEBUG                     LWIP_DBG_OFF
+#endif
+#define LWIP_TESTMODE                   0
+
+#if !defined(CONFIG_LWIP_ASSERT)
+#define LWIP_NOASSERT 1
+#define LWIP_ASSERT(message, assertion)
+#endif
+
+#include "lwip/debug.h"
+
+#define SYS_LIGHTWEIGHT_PROT            0
+#define NO_SYS                          1
+
+#define LWIP_IPV4			1
+#define LWIP_IPV6			0
+
+#define MEM_ALIGNMENT                   1
+#define MEM_SIZE                        1600
+
+#define MEMP_NUM_PBUF                   4
+#define MEMP_NUM_RAW_PCB                2
+#define MEMP_NUM_UDP_PCB                4
+#define MEMP_NUM_TCP_PCB                2
+#define MEMP_NUM_TCP_PCB_LISTEN         2
+#define MEMP_NUM_TCP_SEG                16
+#define MEMP_NUM_REASSDATA              1
+#define MEMP_NUM_ARP_QUEUE              2
+#define MEMP_NUM_SYS_TIMEOUT            4
+#define MEMP_NUM_NETBUF                 2
+#define MEMP_NUM_NETCONN               32
+#define MEMP_NUM_TCPIP_MSG_API          8
+#define MEMP_NUM_TCPIP_MSG_INPKT        8
+#define PBUF_POOL_SIZE                  8
+
+#define LWIP_ARP                        1
+#define ARP_TABLE_SIZE                  1
+#define ARP_QUEUEING                    0
+
+#define IP_FORWARD                      0
+#define IP_OPTIONS_ALLOWED              1
+#define IP_REASSEMBLY                   0
+#define IP_FRAG                         0
+#define IP_REASS_MAXAGE                 3
+#define IP_REASS_MAX_PBUFS              4
+#define IP_FRAG_USES_STATIC_BUF         0
+
+#define IP_DEFAULT_TTL                  255
+
+#define LWIP_ICMP                       0
+
+#if defined(CONFIG_PROT_RAW_LWIP)
+#define LWIP_RAW                        1
+#else
+#define LWIP_RAW			0
+#endif
+
+#if defined(CONFIG_PROT_DHCP_LWIP)
+#define LWIP_DHCP                       1
+#define LWIP_DHCP_BOOTP_FILE		1
+#else
+#define LWIP_DHCP			0
+#endif
+
+#define LWIP_DHCP_DOES_ACD_CHECK	0
+
+#define LWIP_AUTOIP                     0
+
+#define LWIP_SNMP                       0
+
+#define LWIP_IGMP                       0
+
+#if defined(CONFIG_PROT_DNS_LWIP)
+#define LWIP_DNS                        1
+#define DNS_TABLE_SIZE                  1
+#else
+#define LWIP_DNS                        0
+#endif
+
+#if defined(CONFIG_PROT_UDP_LWIP)
+#define LWIP_UDP                        1
+#else
+#define LWIP_UDP                        0
+#endif
+
+#if defined(CONFIG_PROT_TCP_LWIP)
+#define LWIP_TCP                        1
+#else
+#define LWIP_TCP                        0
+#endif
+
+#define LWIP_LISTEN_BACKLOG             0
+
+#define PBUF_LINK_HLEN                  14
+#define PBUF_POOL_BUFSIZE               LWIP_MEM_ALIGN_SIZE(TCP_MSS + 40 + PBUF_LINK_HLEN)
+
+#define LWIP_HAVE_LOOPIF                0
+
+#define LWIP_NETCONN                    0
+#define LWIP_DISABLE_MEMP_SANITY_CHECKS 1
+
+#define LWIP_SOCKET                     0
+#define SO_REUSE                        0
+
+#define LWIP_STATS                      0
+
+#define PPP_SUPPORT                     0
+
+#define LWIP_TCPIP_CORE_LOCKING		0
+
+#define LWIP_NETIF_LOOPBACK		0
+
+/* use malloc instead of pool */
+#define MEMP_MEM_MALLOC                 1
+#define MEMP_MEM_INIT			1
+#define MEM_LIBC_MALLOC			1
+
+#endif /* LWIP_UBOOT_LWIPOPTS_H */
diff --git a/net-lwip/Kconfig b/net-lwip/Kconfig
index f8e0481..7d9ec8f 100644
--- a/net-lwip/Kconfig
+++ b/net-lwip/Kconfig
@@ -12,4 +12,5 @@ menuconfig NET_LWIP
 	  depend on CONFIG_NET (such as cmd/net.c enabled via CONFIG_CMD_NET).
 	  Therefore the two symbols CONFIG_NET and CONFIG_NET_LWIP are mutually
 	  exclusive.
-	  NOTE: This is currently a placeholder.
+	  NOTE: This currently only builds the lwIP library but does not add
+	  any functionality to U-Boot.