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Re: [lwip-devel] [PATCHv2 3/3] net/lwip: add lwip library for the networ


From: Maxim Uvarov
Subject: Re: [lwip-devel] [PATCHv2 3/3] net/lwip: add lwip library for the network stack
Date: Fri, 30 Jun 2023 16:31:10 +0600



On Fri, 30 Jun 2023 at 16:03, Ilias Apalodimas <ilias.apalodimas@linaro.org> wrote:
Hi Maxim,

On Thu, Jun 29, 2023 at 06:34:30PM +0600, Maxim Uvarov wrote:
> This commit adds lwip library for the U-boot network
> stack. Supported commands: ping, tftp, dhcp and wget.
>
> Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>
> ---
>  .gitignore                            |   9 +
>  cmd/net.c                             |  38 +++-
>  include/net.h                         |   2 +-
>  lib/Kconfig                           |   2 +
>  lib/Makefile                          |   2 +
>  lib/lwip/Kconfig                      | 108 ++++++++++
>  lib/lwip/Makefile                     |  98 +++++++++
>  lib/lwip/apps/dhcp/lwip-dhcp.c        |  52 +++++
>  lib/lwip/apps/http/lwip-wget.c        |  71 +++++++
>  lib/lwip/apps/ping/lwip_ping.c        |  37 ++++
>  lib/lwip/apps/ping/lwip_ping.h        |  24 +++

I thought we could compile dhcp/wget etc directly from lwip.  Do we have to
copy them over?

Thanks
/Ilias

It's part of the library or part of examples. I think U-boot should maintain connection code between lwip and lwip and maintain a library and examples.
DHCP in the lwip library is a method to call for the lwip network interface.  I.e. It's part of the library.
Wget - is http_client example, and U-boot code to write results to the memory instead of file.
tftp - is a tftp example.
ping - is a ping example.
So in Makefile I copy an example and compile it. Then add a transition layer between U-boot and lwip to make it work. That has to be easy to maintain when
we will have to upgrade the lwip library to a new version.

BR,
Maxim.

 
>  lib/lwip/apps/ping/ping.h             |  35 ++++
>  lib/lwip/apps/tftp/lwip-tftp.c        | 121 +++++++++++
>  lib/lwip/cmd-lwip.c                   | 276 ++++++++++++++++++++++++++
>  lib/lwip/lwipopts.h                   | 203 +++++++++++++++++++
>  lib/lwip/port/if.c                    | 260 ++++++++++++++++++++++++
>  lib/lwip/port/include/arch/cc.h       |  46 +++++
>  lib/lwip/port/include/arch/sys_arch.h |  59 ++++++
>  lib/lwip/port/include/limits.h        |   0
>  lib/lwip/port/sys-arch.c              |  20 ++
>  lib/lwip/ulwip.h                      |   9 +
>  net/eth-uclass.c                      |   4 +-
>  net/net.c                             |  25 +++
>  23 files changed, 1496 insertions(+), 5 deletions(-)
>  create mode 100644 lib/lwip/Kconfig
>  create mode 100644 lib/lwip/Makefile
>  create mode 100644 lib/lwip/apps/dhcp/lwip-dhcp.c
>  create mode 100644 lib/lwip/apps/http/lwip-wget.c
>  create mode 100644 lib/lwip/apps/ping/lwip_ping.c
>  create mode 100644 lib/lwip/apps/ping/lwip_ping.h
>  create mode 100644 lib/lwip/apps/ping/ping.h
>  create mode 100644 lib/lwip/apps/tftp/lwip-tftp.c
>  create mode 100644 lib/lwip/cmd-lwip.c
>  create mode 100644 lib/lwip/lwipopts.h
>  create mode 100644 lib/lwip/port/if.c
>  create mode 100644 lib/lwip/port/include/arch/cc.h
>  create mode 100644 lib/lwip/port/include/arch/sys_arch.h
>  create mode 100644 lib/lwip/port/include/limits.h
>  create mode 100644 lib/lwip/port/sys-arch.c
>  create mode 100644 lib/lwip/ulwip.h
>
> diff --git a/.gitignore b/.gitignore
> index eb769f144c..be3676c59e 100644
> --- a/.gitignore
> +++ b/.gitignore
> @@ -104,3 +104,12 @@ __pycache__
>  # pylint files
>  /pylint.cur
>  /pylint.out/
> +
> +lib/lwip/lwip-external
> +lib/lwip/apps/ping/ping.c
> +lib/lwip/apps/http/http_client.c
> +lib/lwip/apps/http/http_client.h
> +lib/lwip/apps/tftp/tftp.c
> +lib/lwip/apps/tftp/tftp_client.h
> +lib/lwip/apps/tftp/tftp_common.h
> +lib/lwip/apps/tftp/tftp_example.h
> diff --git a/cmd/net.c b/cmd/net.c
> index 0e9f200ca9..5b3dfd6c7e 100644
> --- a/cmd/net.c
> +++ b/cmd/net.c
> @@ -36,6 +36,10 @@ U_BOOT_CMD(
>  #endif
>
>  #ifdef CONFIG_CMD_TFTPBOOT
> +#if defined(CONFIG_CMD_LWIP_REPLACE_TFTP)
> +int do_lwip_tftp(struct cmd_tbl *cmdtp, int flag, int argc,
> +              char *const argv[]);
> +#endif
>  int do_tftpb(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
>  {
>       int ret;
> @@ -56,7 +60,12 @@ U_BOOT_CMD(
>  );
>  #else
>  U_BOOT_CMD(
> -     tftpboot,       3,      1,      do_tftpb,
> +     tftpboot,       3,      1,
> +#if defined(CONFIG_CMD_LWIP_REPLACE_TFTP)
> +     do_lwip_tftp,
> +#else
> +     do_tftpb,
> +#endif
>       "load file via network using TFTP protocol",
>       "[loadAddress] [[hostIPaddr:]bootfilename]"
>  );
> @@ -112,7 +121,11 @@ U_BOOT_CMD(
>  static int do_dhcp(struct cmd_tbl *cmdtp, int flag, int argc,
>                  char *const argv[])
>  {
> +#if defined(CONFIG_CMD_LWIP_REPLACE_DHCP)
> +     return do_lwip_dhcp();
> +#else
>       return netboot_common(DHCP, cmdtp, argc, argv);
> +#endif
>  }
>
>  U_BOOT_CMD(
> @@ -137,13 +150,22 @@ U_BOOT_CMD(
>  #endif
>
>  #if defined(CONFIG_CMD_WGET)
> +#if defined(CONFIG_CMD_LWIP_REPLACE_WGET)
> +int do_lwip_wget(struct cmd_tbl *cmdtp, int flag, int argc,
> +              char *const argv[])
> +#endif
>  static int do_wget(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[])
>  {
>       return netboot_common(WGET, cmdtp, argc, argv);
>  }
>
>  U_BOOT_CMD(
> -     wget,   3,      1,      do_wget,
> +     wget,   3,      1,
> +#if defined(CONFIG_CMD_LWIP_REPLACE_WGET)
> +     do_lwip_wget,
> +#else
> +     do_wget,
> +#endif
>       "boot image via network using HTTP protocol",
>       "[loadAddress] [[hostIPaddr:]path and image name]"
>  );
> @@ -376,6 +398,10 @@ static int netboot_common(enum proto_t proto, struct cmd_tbl *cmdtp, int argc,
>  }
>
>  #if defined(CONFIG_CMD_PING)
> +#if defined(CONFIG_CMD_LWIP_REPLACE_PING)
> +extern int do_lwip_ping(struct cmd_tbl *cmdtp, int flag, int argc,
> +                     char *const argv[]);
> +#else
>  static int do_ping(struct cmd_tbl *cmdtp, int flag, int argc,
>                  char *const argv[])
>  {
> @@ -395,9 +421,15 @@ static int do_ping(struct cmd_tbl *cmdtp, int flag, int argc,
>
>       return CMD_RET_SUCCESS;
>  }
> +#endif
>
>  U_BOOT_CMD(
> -     ping,   2,      1,      do_ping,
> +     ping,   2,      1,
> +#if defined(CONFIG_CMD_LWIP_REPLACE_PING)
> +     do_lwip_ping,
> +#else
> +     do_ping,
> +#endif
>       "send ICMP ECHO_REQUEST to network host",
>       "pingAddress"
>  );
> diff --git a/include/net.h b/include/net.h
> index 1a99009959..8622983597 100644
> --- a/include/net.h
> +++ b/include/net.h
> @@ -561,7 +561,7 @@ extern int                net_restart_wrap;       /* Tried all network devices */
>
>  enum proto_t {
>       BOOTP, RARP, ARP, TFTPGET, DHCP, PING, PING6, DNS, NFS, CDP, NETCONS,
> -     SNTP, TFTPSRV, TFTPPUT, LINKLOCAL, FASTBOOT, WOL, UDP, NCSI, WGET
> +     SNTP, TFTPSRV, TFTPPUT, LINKLOCAL, FASTBOOT, WOL, UDP, NCSI, WGET, LWIP
>  };
>
>  extern char  net_boot_file_name[1024];/* Boot File name */
> diff --git a/lib/Kconfig b/lib/Kconfig
> index 3c5a4ab386..7485a1f3bf 100644
> --- a/lib/Kconfig
> +++ b/lib/Kconfig
> @@ -1031,3 +1031,5 @@ menu "FWU Multi Bank Updates"
>  source lib/fwu_updates/Kconfig
>
>  endmenu
> +
> +source lib/lwip/Kconfig
> diff --git a/lib/Makefile b/lib/Makefile
> index d77b33e7f4..3b80a41187 100644
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -91,6 +91,8 @@ obj-$(CONFIG_LIBAVB) += libavb/
>  obj-$(CONFIG_$(SPL_TPL_)OF_LIBFDT) += libfdt/
>  obj-$(CONFIG_$(SPL_TPL_)OF_REAL) += fdtdec_common.o fdtdec.o
>
> +obj-y += lwip/
> +
>  ifdef CONFIG_SPL_BUILD
>  obj-$(CONFIG_SPL_YMODEM_SUPPORT) += crc16-ccitt.o
>  obj-$(CONFIG_$(SPL_TPL_)HASH) += crc16-ccitt.o
> diff --git a/lib/lwip/Kconfig b/lib/lwip/Kconfig
> new file mode 100644
> index 0000000000..80d540ba54
> --- /dev/null
> +++ b/lib/lwip/Kconfig
> @@ -0,0 +1,108 @@
> +menu "LWIP"
> +config LWIP_LIB
> +     bool "Support LWIP library"
> +     help
> +       Selecting this option will enable the shared LWIP library code.
> +
> +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 on 16k.
> +config LWIP_LIB_TCP
> +        bool "tcp"
> +        default y
> +config LWIP_LIB_UDP
> +        bool "udp"
> +        default y
> +config LWIP_LIB_DNS
> +        bool "dns"
> +        default n
> +config LWIP_LIB_DHCP
> +        bool "dhcp"
> +        default y
> +
> +config LWIP_LIB_LOOPBACK
> +        bool "loopback"
> +        default n
> +        help
> +        Increases size on 1k.
> +config LWIP_LIB_SOCKET
> +        bool "socket API"
> +        default n
> +config LWIP_LIB_NETCONN
> +        bool "netconn API"
> +        default n
> +config LWIP_LIB_MEM_SIZE
> +     int "mem size"
> +     default 1600
> +     range 1 4096
> +     help
> +         MEM_SIZE: the size of the heap memory. If the application will send
> +         a lot of data that needs to be copied, this should be set high.
> +
> +config LWIP_LIB_PBUF_LINK_HLEN
> +        int "pbuf link hlen"
> +        default 14
> +        range 4 1024
> +        help
> +        PBUF_LINK_HLEN: the number of bytes that should be allocated for a
> +           link level header. The default is 14, the standard value for Ethernet.
> +endmenu
> +
> +config CMD_LWIP
> +        bool "lwip cmd"
> +        default y
> +     depends on LWIP_LIB
> +        help
> +          lwip networking command.
> +
> +config CMD_LWIP_PING
> +        bool "ping"
> +        default y
> +     depends on CMD_LWIP
> +        help
> +          lwip ping command.
> +
> +config CMD_LWIP_REPLACE_PING
> +        bool "replace original ping command"
> +        default n
> +
> +config CMD_LWIP_WGET
> +        bool "wget"
> +        default y
> +     depends on CMD_LWIP
> +        help
> +          lwip wget command.
> +
> +config CMD_LWIP_REPLACE_WGET
> +     bool "replace original wget command"
> +     default n
> +
> +config CMD_LWIP_TFTP
> +        bool "tftp"
> +        default y
> +     depends on CMD_LWIP
> +        help
> +          lwip tftp command.
> +
> +config CMD_LWIP_REPLACE_TFTP
> +     bool "replace original tftp command"
> +     default n
> +
> +config CMD_LWIP_DHCP
> +        bool "dhcp"
> +        default y
> +     depends on CMD_LWIP
> +     depends on LWIP_LIB_DHCP
> +        help
> +          lwip dhcp command.
> +
> +config CMD_LWIP_REPLACE_DHCP
> +     bool "replace original dhcp command"
> +     default n
> +endmenu
> diff --git a/lib/lwip/Makefile b/lib/lwip/Makefile
> new file mode 100644
> index 0000000000..6f68eb04ed
> --- /dev/null
> +++ b/lib/lwip/Makefile
> @@ -0,0 +1,98 @@
> +# SPDX-License-Identifier: GPL-2.0+
> +#
> +# (C) Copyright 2023 Linaro Ltd. <maxim.uvarov@linaro.org>
> +
> +LWIPDIR=lwip-external/src
> +
> +ccflags-y += -I$(CURDIR)/lib/lwip/port/include
> +ccflags-y += -I$(CURDIR)/lib/lwip/lwip-external/src/include -I$(CURDIR)/lib/lwip
> +
> +obj-$(CONFIG_LWIP_LIB) += $(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_LWIP_LIB) += $(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_LWIP_LIB) += $(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_LWIP_LIB) += $(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_LWIP_LIB) += $(LWIPDIR)/netif/ethernet.o
> +
> +obj-$(CONFIG_LWIP_LIB) += port/if.o
> +obj-$(CONFIG_LWIP_LIB) += port/sys-arch.o
> +
> +obj-$(CONFIG_CMD_LWIP) += cmd-lwip.o
> +
> +.PHONY: $(obj)/apps/ping/ping.c
> +$(obj)/apps/ping/ping.o: $(obj)/apps/ping/ping.c
> +$(obj)/apps/ping/ping.c:
> +     cp ./lib/lwip/lwip-external/contrib/apps/ping/ping.c $(obj)/apps/ping/ping.c
> +
> +obj-$(CONFIG_CMD_LWIP) += apps/ping/ping.o
> +obj-$(CONFIG_CMD_LWIP) += apps/ping/lwip_ping.o
> +
> +$(obj)/apps/http/http_clinet.o: $(obj)/apps/http/http_client.c
> +.PHONY: $(obj)/apps/http/http_client.c
> +$(obj)/apps/http/http_client.c:
> +     cp ./lib/lwip/lwip-external/src/apps/http/http_client.c $(obj)/apps/http/http_client.c
> +     cp ./lib/lwip/lwip-external/src/include/lwip/apps/http_client.h $(obj)/apps/http/http_client.h
> +
> +obj-$(CONFIG_CMD_LWIP_WGET) += apps/http/http_client.o
> +obj-$(CONFIG_CMD_LWIP_WGET) += apps/http/lwip-wget.o
> +
> +$(obj)/apps/tftp/tftp.o: $(obj)/apps/tftp/tftp.c
> +.PHONY: $(obj)/apps/tftp/tftp.c
> +$(obj)/apps/tftp/tftp.c:
> +     cp ./lib/lwip/lwip-external/src/apps/tftp/tftp.c $(obj)/apps/tftp/tftp.c
> +     cp ./lib/lwip/lwip-external/src/include/lwip/apps/tftp_client.h $(obj)/apps/tftp/tftp_client.h
> +     cp ./lib/lwip/lwip-external/src/include/lwip/apps/tftp_common.h $(obj)/apps/tftp/tftp_common.h
> +     cp ./lib/lwip/lwip-external/contrib/examples/tftp/tftp_example.h $(obj)/apps/tftp/tftp_example.h
> +
> +obj-$(CONFIG_CMD_LWIP_TFTP) += apps/tftp/tftp.o
> +obj-$(CONFIG_CMD_LWIP_TFTP) += apps/tftp/lwip-tftp.o
> +
> +obj-$(CONFIG_CMD_LWIP_DHCP) += apps/dhcp/lwip-dhcp.o
> diff --git a/lib/lwip/apps/dhcp/lwip-dhcp.c b/lib/lwip/apps/dhcp/lwip-dhcp.c
> new file mode 100644
> index 0000000000..2e4812c7dd
> --- /dev/null
> +++ b/lib/lwip/apps/dhcp/lwip-dhcp.c
> @@ -0,0 +1,52 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/*
> + * (C) Copyright 2023 Linaro Ltd. <maxim.uvarov@linaro.org>
> + */
> +
> +#include <common.h>
> +#include <command.h>
> +#include <console.h>
> +
> +#include <lwip/dhcp.h>
> +#include <lwip/prot/dhcp.h>
> +
> +#include "../../../lwip/ulwip.h"
> +
> +static struct dhcp dhcp;
> +static bool dhcp_is_set;
> +extern struct netif uboot_netif;
> +
> +static int ulwip_dhcp_tmo(void)
> +{
> +     switch (dhcp.state) {
> +     case DHCP_STATE_BOUND:
> +             env_set("bootfile", dhcp.boot_file_name);
> +             env_set("ipaddr", ip4addr_ntoa(&dhcp.offered_ip_addr));
> +             env_set("netmask", ip4addr_ntoa(&dhcp.offered_sn_mask));
> +             env_set("serverip", ip4addr_ntoa(&dhcp.server_ip_addr));
> +             printf("DHCP client bound to address %s\n", ip4addr_ntoa(&dhcp.offered_ip_addr));
> +             break;
> +     default:
> +             return 0;
> +     }
> +
> +     return 0;
> +}
> +
> +int ulwip_dhcp(void)
> +{
> +     int err;
> +
> +     ulwip_set_tmo(ulwip_dhcp_tmo);
> +
> +     if (!dhcp_is_set) {
> +             dhcp_set_struct(&uboot_netif, &dhcp);
> +             dhcp_is_set = true;
> +     }
> +     err = dhcp_start(&uboot_netif);
> +     if (err)
> +             printf("dhcp_start error %d\n", err);
> +
> +     return err;
> +}
> diff --git a/lib/lwip/apps/http/lwip-wget.c b/lib/lwip/apps/http/lwip-wget.c
> new file mode 100644
> index 0000000000..07aabd15f3
> --- /dev/null
> +++ b/lib/lwip/apps/http/lwip-wget.c
> @@ -0,0 +1,71 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/*
> + * (C) Copyright 2023 Linaro Ltd. <maxim.uvarov@linaro.org>
> + */
> +
> +#include <common.h>
> +#include <command.h>
> +#include <console.h>
> +
> +#include "http_client.h"
> +#include "../../../lwip/ulwip.h"
> +
> +static ulong daddr;
> +static httpc_connection_t settings;
> +
> +static err_t httpc_recv(void *arg, struct altcp_pcb *pcb, struct pbuf *p, err_t err)
> +{
> +     struct pbuf *q;
> +     LWIP_UNUSED_ARG(err);
> +
> +     if (!p)
> +             return ERR_BUF;
> +
> +     for (q = p; q != NULL; q = q->next) {
> +             memcpy((void *)daddr, q->payload, q->len);
> +             printf("downloaded chunk size %d, to addr 0x%lx\n", q->len, daddr);
> +             daddr += q->len;
> +     }
> +     altcp_recved(pcb, p->tot_len);
> +     pbuf_free(p);
> +     return ERR_OK;
> +}
> +
> +static void httpc_result(void *arg, httpc_result_t httpc_result, u32_t rx_content_len,
> +                      u32_t srv_res, err_t err)
> +{
> +     if (httpc_result == HTTPC_RESULT_OK) {
> +             printf("\n%d bytes successfully downloaded.\n", rx_content_len);
> +             ulwip_exit(0);
> +     } else {
> +             printf("\nhttp eroror: %d\n", httpc_result);
> +             ulwip_exit(-1);
> +     }
> +}
> +
> +int lwip_wget(ulong addr, char *url)
> +{
> +     err_t err;
> +     int port = 80;
> +     char *server_name;
> +     httpc_state_t *connection;
> +
> +     daddr = addr;
> +     server_name = env_get("serverip");
> +     if (!server_name) {
> +             printf("error: serverip variable has to be set\n");
> +             return CMD_RET_FAILURE;
> +     }
> +
> +     printf("downloading %s to addr 0x%lx\n", url, addr);
> +     memset(&settings, 0, sizeof(httpc_connection_t));
> +     settings.result_fn = httpc_result;
> +     err = httpc_get_file_dns(server_name, port, url, &settings,
> +                              httpc_recv, NULL,  &connection);
> +     if (err != ERR_OK) {
> +             printf("httpc_init_connection failed\n");
> +             return err;
> +     }
> +     return 0;
> +}
> diff --git a/lib/lwip/apps/ping/lwip_ping.c b/lib/lwip/apps/ping/lwip_ping.c
> new file mode 100644
> index 0000000000..a05dc76326
> --- /dev/null
> +++ b/lib/lwip/apps/ping/lwip_ping.c
> @@ -0,0 +1,37 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/*
> + * (C) Copyright 2023 Linaro Ltd. <maxim.uvarov@linaro.org>
> + */
> +
> +#include "lwip/opt.h"
> +#include "lwip/ip_addr.h"
> +#include "ping.h"
> +
> +#include "../../../lwip/ulwip.h"
> +
> +static ip_addr_t ip_target;
> +
> +static int ulwip_ping_tmo(void)
> +{
> +
> +     printf("ping failed; host %s is not alive\n", ipaddr_ntoa(&ip_target));
> +     return 0;
> +}
> +
> +int lwip_ping_init(char *ping_addr)
> +{
> +     int err;
> +
> +     err = ipaddr_aton(ping_addr, &ip_target);
> +     if (err == 0) {
> +             printf("wrong ping addr string \"%s\" \n", ping_addr);
> +             return -1;
> +     }
> +
> +     ulwip_set_tmo(ulwip_ping_tmo);
> +
> +     ping_init(&ip_target);
> +
> +     return 0;
> +}
> diff --git a/lib/lwip/apps/ping/lwip_ping.h b/lib/lwip/apps/ping/lwip_ping.h
> new file mode 100644
> index 0000000000..7f08095427
> --- /dev/null
> +++ b/lib/lwip/apps/ping/lwip_ping.h
> @@ -0,0 +1,24 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +
> +/*
> + * (C) Copyright 2023 Linaro Ltd. <maxim.uvarov@linaro.org>
> + */
> +
> +#ifndef LWIP_PING_H
> +#define LWIP_PING_H
> +
> +#include <lwip/ip_addr.h>
> +
> +/**
> + * PING_USE_SOCKETS: Set to 1 to use sockets, otherwise the raw api is used
> + */
> +#ifndef PING_USE_SOCKETS
> +#define PING_USE_SOCKETS   0
> +#endif
> +
> +int lwip_ping_init(char *ping_addr);
> +
> +void ping_raw_init(void);
> +void ping_send_now(void);
> +
> +#endif /* LWIP_PING_H */
> diff --git a/lib/lwip/apps/ping/ping.h b/lib/lwip/apps/ping/ping.h
> new file mode 100644
> index 0000000000..0dd4bd78c7
> --- /dev/null
> +++ b/lib/lwip/apps/ping/ping.h
> @@ -0,0 +1,35 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +#include "../../../lwip/ulwip.h"
> +
> +#include "lwip/prot/ip4.h"
> +
> +#define ip4_print_parts(a, b, c, d) \
> +     printf("%" U16_F ".%" U16_F ".%" U16_F ".%" U16_F, a, b, c, d);
> +
> +#define ip4_print(ipaddr) \
> +     ip4_print_parts(\
> +                     (u16_t)((ipaddr) != NULL ? ip4_addr1_16(ipaddr) : 0), \
> +                     (u16_t)((ipaddr) != NULL ? ip4_addr2_16(ipaddr) : 0), \
> +                     (u16_t)((ipaddr) != NULL ? ip4_addr3_16(ipaddr) : 0), \
> +                     (u16_t)((ipaddr) != NULL ? ip4_addr4_16(ipaddr) : 0))
> +
> +
> +#define LWIP_DEBUG 1 /* ping_time is under ifdef*/
> +#define PING_RESULT(cond) { \
> +     if (cond == 1) { \
> +             printf("host "); \
> +             ip4_print(addr); \
> +             printf(" is alive\n"); \
> +             printf(" %"U32_F" ms\n", (sys_now() - ping_time)); \
> +             ulwip_exit(0); \
> +     } else { \
> +             printf("ping failed; host "); \
> +             ip4_print(addr); \
> +             printf(" is not alive\n"); \
> +             ulwip_exit(-1); \
> +     } \
> +     } while (0);
> +
> +#include "lwip/ip_addr.h"
> +void ping_init(const ip_addr_t *ping_addr);
> diff --git a/lib/lwip/apps/tftp/lwip-tftp.c b/lib/lwip/apps/tftp/lwip-tftp.c
> new file mode 100644
> index 0000000000..c38e83c8ee
> --- /dev/null
> +++ b/lib/lwip/apps/tftp/lwip-tftp.c
> @@ -0,0 +1,121 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/*
> + * (C) Copyright 2023 Linaro Ltd. <maxim.uvarov@linaro.org>
> + */
> +
> +#include <common.h>
> +#include <command.h>
> +#include <console.h>
> +
> +#include "lwip/apps/tftp_client.h"
> +#include "lwip/apps/tftp_server.h"
> +#include "tftp_example.h"
> +
> +#include <string.h>
> +
> +#include "../../../lwip/ulwip.h"
> +
> +#if LWIP_UDP
> +
> +static ulong daddr;
> +static ulong size;
> +
> +static void *tftp_open(const char *fname, const char *mode, u8_t is_write)
> +{
> +     LWIP_UNUSED_ARG(mode);
> +     return NULL;
> +}
> +
> +static void tftp_close(void *handle)
> +{
> +     printf("\ndone\n");
> +     printf("Bytes transferred = %ld (0x%lx hex)\n", size, size);
> +     ulwip_exit(0);
> +}
> +
> +static int tftp_read(void *handle, void *buf, int bytes)
> +{
> +     return 0;
> +}
> +
> +static int tftp_write(void *handle, struct pbuf *p)
> +{
> +     struct pbuf *q;
> +
> +     for (q = p; q != NULL; q = q->next) {
> +             memcpy((void *)daddr, q->payload, q->len);
> +             /* printf("downloaded chunk size %d, to addr 0x%lx\n", q->len, daddr); */
> +             daddr += q->len;
> +             size += q->len;
> +             printf("#");
> +     }
> +
> +     return 0;
> +}
> +
> +/* For TFTP client only */
> +static void tftp_error(void *handle, int err, const char *msg, int size)
> +{
> +     char message[100];
> +
> +     LWIP_UNUSED_ARG(handle);
> +
> +     memset(message, 0, sizeof(message));
> +     MEMCPY(message, msg, LWIP_MIN(sizeof(message)-1, (size_t)size));
> +
> +     printf("TFTP error: %d (%s)", err, message);
> +}
> +
> +static const struct tftp_context tftp = {
> +     tftp_open,
> +     tftp_close,
> +     tftp_read,
> +     tftp_write,
> +     tftp_error
> +};
> +
> +int lwip_tftp(ulong addr, char *fname)
> +{
> +     void *f = (void *)0x1; /*fake handle*/
> +     err_t err;
> +     ip_addr_t srv;
> +     int ret;
> +     char *server_ip;
> +
> +     if (!fname || addr == 0)
> +             return CMD_RET_FAILURE;
> +
> +     size = 0;
> +     daddr = addr;
> +     server_ip = env_get("serverip");
> +     if (!server_ip) {
> +             printf("error: serverip variable has to be set\n");
> +             return CMD_RET_FAILURE;
> +     }
> +
> +     ret = ipaddr_aton(server_ip, &srv);
> +     LWIP_ASSERT("ipaddr_aton failed", ret == 1);
> +
> +     printf("TFTP from server %s; our IP address is %s\n",
> +                     server_ip, env_get("ipaddr"));
> +     printf("Filename '%s'.\n", fname);
> +     printf("Load address: 0x%lx\n", daddr);
> +     printf("Loading:");
> +
> +     err = tftp_init_client(&tftp);
> +     if (!(err == ERR_OK || err == ERR_USE))
> +             printf("tftp_init_client err: %d\n", err);
> +
> +     err = tftp_get(f, &srv, TFTP_PORT, fname, TFTP_MODE_OCTET);
> +     /* might return different errors, like routing problems */
> +     if (err != ERR_OK) {
> +             printf("tftp_get err=%d\n", err);
> +     }
> +     LWIP_ASSERT("tftp_get failed", err == ERR_OK);
> +
> +     return err;
> +}
> +#else
> +#error "UDP has to be supported"
> +#endif /* LWIP_UDP */
> diff --git a/lib/lwip/cmd-lwip.c b/lib/lwip/cmd-lwip.c
> new file mode 100644
> index 0000000000..d7cdc4e411
> --- /dev/null
> +++ b/lib/lwip/cmd-lwip.c
> @@ -0,0 +1,276 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/*
> + * (C) Copyright 2023 Maxim Uvarov, maxim.uvarov@linaro.org
> + */
> +
> +#include <common.h>
> +#include <command.h>
> +#include <console.h>
> +#include <display_options.h>
> +#include <memalign.h>
> +#include <net.h>
> +#include <image.h>
> +
> +#include "apps/ping/lwip_ping.h"
> +#include "ulwip.h"
> +
> +extern int uboot_lwip_init(void);
> +extern int uboot_lwip_loop_is_done(void);
> +
> +static int do_lwip_info(struct cmd_tbl *cmdtp, int flag, int argc,
> +                   char *const argv[])
> +{
> +     printf("TBD: %s\n", __func__);
> +     return CMD_RET_SUCCESS;
> +}
> +
> +static int do_lwip_init(struct cmd_tbl *cmdtp, int flag, int argc,
> +                   char *const argv[])
> +{
> +     if (!uboot_lwip_init())
> +             return CMD_RET_SUCCESS;
> +     return CMD_RET_FAILURE;
> +}
> +
> +static int lwip_empty_tmo(void) { return 0; };
> +int (*ulwip_tmo)(void) = lwip_empty_tmo;
> +void ulwip_set_tmo(int (*tmo)(void))
> +{
> +     ulwip_tmo = tmo;
> +}
> +
> +static void ulwip_clear_tmo(void)
> +{
> +     ulwip_tmo = lwip_empty_tmo;
> +}
> +
> +static void ulwip_timeout_handler(void)
> +{
> +     eth_halt();
> +     ulwip_tmo();
> +     net_set_state(NETLOOP_FAIL);    /* we did not get the reply */
> +     ulwip_loop_set(0);
> +}
> +
> +static int ulwip_loop(void)
> +{
> +     ulwip_loop_set(1);
> +     if (net_loop(LWIP) < 0) {
> +             ulwip_loop_set(0);
> +             return CMD_RET_FAILURE;
> +     }
> +     ulwip_loop_set(0);
> +     return CMD_RET_SUCCESS;
> +}
> +
> +#if !defined(CONFIG_CMD_LWIP_REPLACE_PING)
> +static
> +#endif
> +int do_lwip_ping(struct cmd_tbl *cmdtp, int flag, int argc,
> +              char *const argv[])
> +{
> +     if (argc < 2) {
> +             printf("argc = %d, error\n", argc);
> +             return CMD_RET_USAGE;
> +     }
> +
> +     uboot_lwip_init();
> +
> +     eth_init(); /* activate u-boot eth dev */
> +
> +     printf("Using %s device\n", eth_get_name());
> +     printf("pinging addr: %s\n", argv[1]);
> +
> +     net_set_timeout_handler(1000UL, ulwip_timeout_handler);
> +
> +     if (lwip_ping_init(argv[1])) {
> +             printf("ping init fail\n");
> +             return CMD_RET_FAILURE;
> +     }
> +
> +     ping_send_now();
> +
> +     return ulwip_loop();
> +}
> +
> +extern int lwip_wget(ulong addr, char *url);
> +
> +#if !defined(CONFIG_CMD_LWIP_REPLACE_WGET)
> +static
> +#endif
> +int do_lwip_wget(struct cmd_tbl *cmdtp, int flag, int argc,
> +              char *const argv[])
> +{
> +     char *url;
> +
> +     if (argc < 2) {
> +             printf("argc = %d, error\n", argc);
> +             return CMD_RET_USAGE;
> +     }
> +     url = ""> > +
> +     uboot_lwip_init();
> +
> +     eth_init(); /* activate u-boot eth dev */
> +
> +     lwip_wget(image_load_addr, url);
> +
> +     return ulwip_loop();
> +}
> +
> +#if defined(CONFIG_CMD_LWIP_TFTP)
> +extern int lwip_tftp(ulong addr, char *filename);
> +#if !defined(CONFIG_CMD_LWIP_REPLACE_TFTP)
> +static
> +#endif
> +int do_lwip_tftp(struct cmd_tbl *cmdtp, int flag, int argc,
> +              char *const argv[])
> +{
> +     char *filename;
> +     ulong addr;
> +     char *end;
> +     int ret;
> +
> +     switch (argc) {
> +     case 1:
> +             filename = env_get("bootfile");
> +             break;
> +     case 2:
> +             /*
> +              * Only one arg - accept two forms:
> +              * Just load address, or just boot file name. The latter
> +              * form must be written in a format which can not be
> +              * mis-interpreted as a valid number.
> +              */
> +             addr = hextoul(argv[1], &end);
> +             if (end == (argv[1] + strlen(argv[1]))) {
> +                     image_load_addr = addr;
> +                     filename = env_get("bootfile");
> +             } else {
> +                     filename = argv[1];
> +             }
> +             break;
> +     case 3:
> +             image_load_addr = hextoul(argv[1], NULL);
> +             filename = argv[2];
> +             break;
> +     default:
> +             return CMD_RET_USAGE;
> +     }
> +
> +     uboot_lwip_init();
> +
> +     eth_init(); /* activate u-boot eth dev */
> +
> +     ret = lwip_tftp(image_load_addr, filename);
> +     if (ret)
> +             return ret;
> +
> +     return ulwip_loop();
> +}
> +#endif
> +
> +#if defined(CONFIG_CMD_LWIP_DHCP)
> +extern int ulwip_dhcp(void);
> +
> +#if !defined(CONFIG_CMD_LWIP_REPLACE_DHCP)
> +static
> +#endif
> +int do_lwip_dhcp(void)
> +{
> +     int ret;
> +     char *filename;
> +
> +     uboot_lwip_init();
> +
> +     ret = ulwip_dhcp();
> +
> +     net_set_timeout_handler(2000UL, ulwip_timeout_handler);
> +
> +     ulwip_loop();
> +     if (IS_ENABLED(CONFIG_CMD_LWIP_TFTP)) {
> +             ulwip_clear_tmo();
> +
> +             filename = env_get("bootfile");
> +             if (!filename) {
> +                     printf("no bootfile\n");
> +                     return CMD_RET_FAILURE;
> +             }
> +
> +             eth_init(); /* activate u-boot eth dev */
> +             net_set_timeout_handler(20000UL, ulwip_timeout_handler);
> +             lwip_tftp(image_load_addr, filename);
> +
> +             ret =  ulwip_loop();
> +     }
> +
> +     return ret;
> +}
> +
> +static int _do_lwip_dhcp(struct cmd_tbl *cmdtp, int flag, int argc,
> +             char *const argv[])
> +{
> +     return do_lwip_dhcp();
> +}
> +#endif
> +
> +static struct cmd_tbl cmds[] = {
> +     U_BOOT_CMD_MKENT(info, 1, 0, do_lwip_info, "Info and stats", ""),
> +     U_BOOT_CMD_MKENT(init, 1, 0, do_lwip_init,
> +                      "initialize lwip stack", ""),
> +#if defined(CONFIG_CMD_LWIP_PING)
> +     U_BOOT_CMD_MKENT(ping, 2, 0, do_lwip_ping,
> +                      "send ICMP ECHO_REQUEST to network host",
> +                      "pingAddress"),
> +#endif
> +#if defined(CONFIG_CMD_LWIP_WGET)
> +     U_BOOT_CMD_MKENT(wget, 2, 0, do_lwip_wget, "", ""),
> +#endif
> +#if defined(CONFIG_CMD_LWIP_TFTP)
> +     U_BOOT_CMD_MKENT(tftp, 3, 0, do_lwip_tftp,
> +                     "boot image via network using TFTP protocol\n",
> +                     "[loadAddress] [[hostIPaddr:]bootfilename]"),
> +#endif
> +#if defined(CONFIG_CMD_LWIP_DHCP)
> +     U_BOOT_CMD_MKENT(dhcp, 1, 0, _do_lwip_dhcp,
> +                     "boot image via network using DHCP/TFTP protocol",
> +                     ""),
> +#endif
> +};
> +
> +static int do_ops(struct cmd_tbl *cmdtp, int flag, int argc,
> +                  char *const argv[])
> +{
> +     struct cmd_tbl *cp;
> +
> +     cp = find_cmd_tbl(argv[1], cmds, ARRAY_SIZE(cmds));
> +
> +     argc--;
> +     argv++;
> +
> +     if (cp == NULL || argc > cp->maxargs)
> +             return CMD_RET_USAGE;
> +     if (flag == CMD_FLAG_REPEAT && !cmd_is_repeatable(cp))
> +             return CMD_RET_SUCCESS;
> +
> +     return cp->cmd(cmdtp, flag, argc, argv);
> +}
> +
> +U_BOOT_CMD(
> +     lwip, 4, 1, do_ops,
> +     "LWIP sub system",
> +     "info - display info\n"
> +     "init - init LWIP\n"
> +     "ping addr - pingAddress\n"
> +     "wget http://IPadress/url/\n"
> +     "tftp [loadAddress] [[hostIPaddr:]bootfilename]\n"
> +     "dhcp - boot image via network using DHCP/TFTP protocol\n"
> +     );
> +
> +/* Old command kept for compatibility. Same as 'mmc info' */
> +U_BOOT_CMD(
> +     lwipinfo, 1, 0, do_lwip_info,
> +     "display LWIP info",
> +     "- display LWIP stack info"
> +);
> diff --git a/lib/lwip/lwipopts.h b/lib/lwip/lwipopts.h
> new file mode 100644
> index 0000000000..b943d7b9be
> --- /dev/null
> +++ b/lib/lwip/lwipopts.h
> @@ -0,0 +1,203 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +
> +/*
> + * (C) Copyright 2023 Linaro Ltd. <maxim.uvarov@linaro.org>
> + */
> +
> +#ifndef LWIP_LWIPOPTS_H
> +#define LWIP_LWIPOPTS_H
> +
> +#include "lwipopts.h"
> +
> +#if defined(CONFIG_LWIP_LIB_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_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_ON
> +#define AUTOIP_DEBUG                    LWIP_DBG_ON
> +#define DNS_DEBUG                       LWIP_DBG_OFF
> +#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_LIB_NOASSERT)
> +#define LWIP_NOASSERT 1
> +#define LWIP_ASSERT(message, assertion)
> +#endif
> +
> +#include "lwip/debug.h"
> +
> +#define SYS_LIGHTWEIGHT_PROT            0
> +#define NO_SYS                          0
> +
> +#define MEM_ALIGNMENT                   1
> +#define MEM_SIZE                        CONFIG_LWIP_LIB_MEM_SIZE
> +
> +#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 IP_FORWARD                      0
> +#define IP_OPTIONS_ALLOWED              1
> +#define IP_REASSEMBLY                   1
> +#define IP_FRAG                         1
> +#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                       1
> +
> +#define LWIP_RAW                        1
> +
> +#if defined(CONFIG_LWIP_LIB_DHCP)
> +#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_LWIP_LIB_DNS)
> +#define LWIP_DNS                        1
> +#else
> +#define LWIP_DNS                        0
> +#endif
> +
> +#if defined(CONFIG_LWIP_LIB_TCP)
> +#define LWIP_UDP                        1
> +#else
> +#define LWIP_UDP                        0
> +#endif
> +
> +#if defined(CONFIG_LWIP_LIB_TCP)
> +#define LWIP_TCP                        1
> +#else
> +#define LWIP_TCP                        0
> +#endif
> +
> +#define LWIP_LISTEN_BACKLOG             0
> +
> +#define PBUF_LINK_HLEN                  CONFIG_LWIP_LIB_PBUF_LINK_HLEN
> +#define PBUF_POOL_BUFSIZE               LWIP_MEM_ALIGN_SIZE(TCP_MSS + 40 + PBUF_LINK_HLEN)
> +
> +#define LWIP_HAVE_LOOPIF                0
> +
> +#if defined(CONFIG_LWIP_LIB_NETCONN)
> +#define LWIP_NETCONN                    1
> +#else
> +#define LWIP_NETCONN                    0
> +#define LWIP_DISABLE_MEMP_SANITY_CHECKS 1
> +#endif
> +
> +#if defined(CONFIG_LWIP_LIB_SOCKET)
> +#define LWIP_SOCKET                     1
> +
> +#define SO_REUSE                        1
> +#else
> +#define LWIP_SOCKET                     0
> +#define SO_REUSE                        0
> +#endif
> +
> +#define LWIP_STATS                      0
> +
> +#define PPP_SUPPORT                     0
> +
> +#define LWIP_TCPIP_CORE_LOCKING              0
> +
> +#if defined(CONFIG_LWIP_LIB_LOOPBACK)
> +#define LWIP_NETIF_LOOPBACK          1
> +#else
> +#define LWIP_NETIF_LOOPBACK          0
> +#endif
> +/* use malloc instead of pool */
> +#define MEMP_MEM_MALLOC                 1
> +#define MEMP_MEM_INIT                        1
> +#define MEM_LIBC_MALLOC                      1
> +
> +#endif /* LWIP_LWIPOPTS_H */
> diff --git a/lib/lwip/port/if.c b/lib/lwip/port/if.c
> new file mode 100644
> index 0000000000..15d44054be
> --- /dev/null
> +++ b/lib/lwip/port/if.c
> @@ -0,0 +1,260 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/*
> + * (C) Copyright 2023 Linaro Ltd. <maxim.uvarov@linaro.org>
> + */
> +
> +#include <common.h>
> +#include <command.h>
> +extern int eth_init(void); /* net.h */
> +extern void string_to_enetaddr(const char *addr, uint8_t *enetaddr); /* net.h */
> +extern struct in_addr net_ip;
> +extern u8 net_ethaddr[6];
> +
> +#include "lwip/debug.h"
> +#include "lwip/arch.h"
> +#include "netif/etharp.h"
> +#include "lwip/stats.h"
> +#include "lwip/def.h"
> +#include "lwip/mem.h"
> +#include "lwip/pbuf.h"
> +#include "lwip/sys.h"
> +#include "lwip/netif.h"
> +
> +#include "lwip/ip.h"
> +
> +#define IFNAME0 'e'
> +#define IFNAME1 '0'
> +
> +static struct pbuf *low_level_input(struct netif *netif);
> +static int uboot_net_use_lwip;
> +
> +int ulwip_enabled(void)
> +{
> +     return uboot_net_use_lwip;
> +}
> +
> +/* 1 - in loop
> + * 0 - no loop
> + */
> +static int loop_lwip;
> +
> +/* ret 1 - in loop
> + *     0 - no loop
> + */
> +int ulwip_in_loop(void)
> +{
> +     return loop_lwip;
> +}
> +
> +void ulwip_loop_set(int loop)
> +{
> +     loop_lwip = loop;
> +}
> +
> +static int ulwip_app_err;
> +
> +void ulwip_exit(int err)
> +{
> +     ulwip_app_err = err;
> +     ulwip_loop_set(0);
> +}
> +
> +int ulwip_app_get_err(void)
> +{
> +     return ulwip_app_err;
> +}
> +
> +struct uboot_lwip_if {
> +};
> +
> +#if defined(CONFIG_CMD_LWIP_DHCP)
> +struct netif uboot_netif;
> +#else
> +static struct netif uboot_netif;
> +#endif
> +
> +#define LWIP_PORT_INIT_NETMASK(addr)  IP4_ADDR((addr), 255, 255, 255, 0)
> +
> +extern uchar *net_rx_packet;
> +extern int    net_rx_packet_len;
> +
> +int uboot_lwip_poll(void)
> +{
> +     struct pbuf *p;
> +     int err;
> +
> +     p = low_level_input(&uboot_netif);
> +     if (!p) {
> +             printf("error p = low_level_input = NULL\n");
> +             return 0;
> +     }
> +
> +     err = ethernet_input(p, &uboot_netif);
> +     if (err)
> +             printf("ip4_input err %d\n", err);
> +
> +     return 0;
> +}
> +
> +static struct pbuf *low_level_input(struct netif *netif)
> +{
> +     struct pbuf *p, *q;
> +     u16_t len = net_rx_packet_len;
> +     uchar *data = ""> > +
> +#if ETH_PAD_SIZE
> +     len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
> +#endif
> +
> +     /* We allocate a pbuf chain of pbufs from the pool. */
> +     p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
> +     if (p) {
> +#if ETH_PAD_SIZE
> +             pbuf_remove_header(p, ETH_PAD_SIZE); /* drop the padding word */
> +#endif
> +             /* We iterate over the pbuf chain until we have read the entire
> +              * packet into the pbuf.
> +              */
> +             for (q = p; q != NULL; q = q->next) {
> +                     /* Read enough bytes to fill this pbuf in the chain. The
> +                      * available data in the pbuf is given by the q->len
> +                      * variable.
> +                      * This does not necessarily have to be a memcpy, you can also preallocate
> +                      * pbufs for a DMA-enabled MAC and after receiving truncate it to the
> +                      * actually received size. In this case, ensure the tot_len member of the
> +                      * pbuf is the sum of the chained pbuf len members.
> +                      */
> +                     MEMCPY(q->payload, data, q->len);
> +                     data += q->len;
> +             }
> +             //acknowledge that packet has been read();
> +
> +#if ETH_PAD_SIZE
> +             pbuf_add_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
> +#endif
> +             LINK_STATS_INC(link.recv);
> +     } else {
> +             //drop packet();
> +             LINK_STATS_INC(link.memerr);
> +             LINK_STATS_INC(link.drop);
> +     }
> +
> +     return p;
> +}
> +
> +static int ethernetif_input(struct pbuf *p, struct netif *netif)
> +{
> +     struct ethernetif *ethernetif;
> +
> +     ethernetif = netif->state;
> +
> +     /* move received packet into a new pbuf */
> +     p = low_level_input(netif);
> +
> +     /* if no packet could be read, silently ignore this */
> +     if (p) {
> +             /* pass all packets to ethernet_input, which decides what packets it supports */
> +             if (netif->input(p, netif) != ERR_OK) {
> +                     LWIP_DEBUGF(NETIF_DEBUG, ("%s: IP input error\n", __func__));
> +                     pbuf_free(p);
> +                     p = NULL;
> +             }
> +     }
> +     return 0;
> +}
> +
> +static err_t low_level_output(struct netif *netif, struct pbuf *p)
> +{
> +     int err;
> +
> +     err = eth_send(p->payload, p->len);
> +     if (err != 0) {
> +             printf("eth_send error %d\n", err);
> +             return ERR_ABRT;
> +     }
> +     return ERR_OK;
> +}
> +
> +err_t uboot_lwip_if_init(struct netif *netif)
> +{
> +     struct uboot_lwip_if *uif = (struct uboot_lwip_if *)malloc(sizeof(struct uboot_lwip_if));
> +
> +     if (!uif) {
> +             printf("uboot_lwip_if: out of memory\n");
> +             return ERR_MEM;
> +     }
> +     netif->state = uif;
> +
> +     netif->name[0] = IFNAME0;
> +     netif->name[1] = IFNAME1;
> +
> +     netif->hwaddr_len = ETHARP_HWADDR_LEN;
> +     string_to_enetaddr(env_get("ethaddr"), netif->hwaddr);
> +#if defined(CONFIG_LWIP_LIB_DEBUG)
> +     printf("              MAC: %02X:%02X:%02X:%02X:%02X:%02X\n",
> +            netif->hwaddr[0], netif->hwaddr[1], netif->hwaddr[2],
> +            netif->hwaddr[3], netif->hwaddr[4], netif->hwaddr[5]);
> +#endif
> +
> +#if LWIP_IPV4
> +     netif->output = etharp_output;
> +#endif /* LWIP_IPV4 */
> +#if LWIP_IPV6
> +     netif->output_ip6 = ethip6_output;
> +#endif /* LWIP_IPV6 */
> +     netif->linkoutput = low_level_output;
> +     netif->mtu = 1500;
> +     netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_LINK_UP;
> +
> +     eth_init(); /* activate u-boot eth dev */
> +
> +     if (IS_ENABLED(CONFIG_LWIP_LIB_DEBUG)) {
> +             printf("Initialized LWIP stack\n");
> +     }
> +
> +     return ERR_OK;
> +}
> +
> +int uboot_lwip_init(void)
> +{
> +     ip4_addr_t ipaddr, netmask, gw;
> +
> +     if (uboot_net_use_lwip)
> +             return CMD_RET_SUCCESS;
> +
> +     ip4_addr_set_zero(&gw);
> +     ip4_addr_set_zero(&ipaddr);
> +     ip4_addr_set_zero(&netmask);
> +
> +     ipaddr_aton(env_get("ipaddr"), &ipaddr);
> +     ipaddr_aton(env_get("ipaddr"), &netmask);
> +
> +     LWIP_PORT_INIT_NETMASK(&netmask);
> +     if (IS_ENABLED(CONFIG_LWIP_LIB_DEBUG)) {
> +             printf("Starting lwIP, IP: %s\n", ip4addr_ntoa(&ipaddr));
> +             printf("               GW: %s\n", ip4addr_ntoa(&gw));
> +             printf("             mask: %s\n", ip4addr_ntoa(&netmask));
> +     }
> +
> +     if (!netif_add(&uboot_netif, &ipaddr, &netmask, &gw,
> +                    &uboot_netif, uboot_lwip_if_init, ethernetif_input))
> +             printf("err: netif_add failed!\n");
> +
> +     netif_set_up(&uboot_netif);
> +     netif_set_link_up(&uboot_netif);
> +#if LWIP_IPV6
> +     netif_create_ip6_linklocal_address(&uboot_netif, 1);
> +     printf("             IPv6: %s\n", ip6addr_ntoa(netif_ip6_addr(uboot_netif, 0)));
> +#endif /* LWIP_IPV6 */
> +
> +     uboot_net_use_lwip = 1;
> +
> +     return CMD_RET_SUCCESS;
> +}
> +
> +/* placeholder, not used now */
> +void uboot_lwip_destroy(void)
> +{
> +     uboot_net_use_lwip = 0;
> +}
> diff --git a/lib/lwip/port/include/arch/cc.h b/lib/lwip/port/include/arch/cc.h
> new file mode 100644
> index 0000000000..db30d7614e
> --- /dev/null
> +++ b/lib/lwip/port/include/arch/cc.h
> @@ -0,0 +1,46 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +/*
> + * (C) Copyright 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>
> +
> +#define LWIP_ERRNO_INCLUDE <errno.h>
> +
> +#define LWIP_ERRNO_STDINCLUDE        1
> +#define LWIP_NO_UNISTD_H 1
> +#define LWIP_TIMEVAL_PRIVATE 1
> +
> +extern unsigned int lwip_port_rand(void);
> +#define LWIP_RAND() (lwip_port_rand())
> +
> +/* 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)
> +
> +static inline int atoi(const char *str)
> +{
> +     int r = 0;
> +     int i;
> +
> +     for (i = 0; str[i] != '\0'; ++i)
> +             r = r * 10 + str[i] - '0';
> +
> +     return r;
> +}
> +
> +#define LWIP_ERR_T int
> +
> +#endif /* LWIP_ARCH_CC_H */
> diff --git a/lib/lwip/port/include/arch/sys_arch.h b/lib/lwip/port/include/arch/sys_arch.h
> new file mode 100644
> index 0000000000..8d95146275
> --- /dev/null
> +++ b/lib/lwip/port/include/arch/sys_arch.h
> @@ -0,0 +1,59 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +/*
> + * (C) Copyright 2023 Linaro Ltd. <maxim.uvarov@linaro.org>
> + */
> +
> +#ifndef LWIP_ARCH_SYS_ARCH_H
> +#define LWIP_ARCH_SYS_ARCH_H
> +
> +#include "lwip/opt.h"
> +#include "lwip/arch.h"
> +#include "lwip/err.h"
> +
> +#define ERR_NEED_SCHED 123
> +
> +void sys_arch_msleep(u32_t delay_ms);
> +#define sys_msleep(ms) sys_arch_msleep(ms)
> +
> +#if SYS_LIGHTWEIGHT_PROT
> +typedef u32_t sys_prot_t;
> +#endif /* SYS_LIGHTWEIGHT_PROT */
> +
> +#include <errno.h>
> +
> +#define SYS_MBOX_NULL NULL
> +#define SYS_SEM_NULL  NULL
> +
> +typedef u32_t sys_prot_t;
> +
> +struct sys_sem;
> +typedef struct sys_sem *sys_sem_t;
> +#define sys_sem_valid(sem) (((sem) != NULL) && (*(sem) != NULL))
> +#define sys_sem_set_invalid(sem) do { if ((sem) != NULL) { *(sem) = NULL; }} while (0)
> +
> +/* let sys.h use binary semaphores for mutexes */
> +#define LWIP_COMPAT_MUTEX 1
> +#define LWIP_COMPAT_MUTEX_ALLOWED 1
> +
> +struct sys_mbox;
> +typedef struct sys_mbox *sys_mbox_t;
> +#define sys_mbox_valid(mbox) (((mbox) != NULL) && (*(mbox) != NULL))
> +#define sys_mbox_set_invalid(mbox) do { if ((mbox) != NULL) { *(mbox) = NULL; }} while (0)
> +
> +struct sys_thread;
> +typedef struct sys_thread *sys_thread_t;
> +
> +static inline u32_t sys_arch_sem_wait(sys_sem_t *sem, u32_t timeout)
> +{
> +     return 0;
> +};
> +
> +static inline err_t sys_mbox_trypost(sys_mbox_t *mbox, void *msg)
> +{
> +     return 0;
> +};
> +
> +#define sys_sem_signal(s)
> +
> +#endif /* LWIP_ARCH_SYS_ARCH_H */
> diff --git a/lib/lwip/port/include/limits.h b/lib/lwip/port/include/limits.h
> new file mode 100644
> index 0000000000..e69de29bb2
> diff --git a/lib/lwip/port/sys-arch.c b/lib/lwip/port/sys-arch.c
> new file mode 100644
> index 0000000000..609eeccf8c
> --- /dev/null
> +++ b/lib/lwip/port/sys-arch.c
> @@ -0,0 +1,20 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/*
> + * (C) Copyright 2023 Linaro Ltd. <maxim.uvarov@linaro.org>
> + */
> +
> +#include <common.h>
> +#include <rand.h>
> +#include "lwip/opt.h"
> +
> +u32_t sys_now(void)
> +{
> +     return get_timer(0);
> +}
> +
> +u32_t lwip_port_rand(void)
> +{
> +     return (u32_t)rand();
> +}
> +
> diff --git a/lib/lwip/ulwip.h b/lib/lwip/ulwip.h
> new file mode 100644
> index 0000000000..11ca52aa1f
> --- /dev/null
> +++ b/lib/lwip/ulwip.h
> @@ -0,0 +1,9 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +int ulwip_enabled(void);
> +int ulwip_in_loop(void);
> +int ulwip_loop_set(int loop);
> +int ulwip_exit(int err);
> +int uboot_lwip_poll(void);
> +int ulwip_app_get_err(void);
> +void ulwip_set_tmo(int (*tmo)(void));
> diff --git a/net/eth-uclass.c b/net/eth-uclass.c
> index f41da4b37b..6031ad805d 100644
> --- a/net/eth-uclass.c
> +++ b/net/eth-uclass.c
> @@ -367,8 +367,10 @@ int eth_send(void *packet, int length)
>       if (!current)
>               return -ENODEV;
>
> -     if (!eth_is_active(current))
> +     if (!eth_is_active(current)) {
> +             printf("%s() !eth_is_active\n", __func__);
>               return -EINVAL;
> +     }
>
>       ret = eth_get_ops(current)->send(current, packet, length);
>       if (ret < 0) {
> diff --git a/net/net.c b/net/net.c
> index 57da9bda85..aa9dd85a99 100644
> --- a/net/net.c
> +++ b/net/net.c
> @@ -121,6 +121,7 @@
>  #endif
>  #include <net/tcp.h>
>  #include <net/wget.h>
> +#include "../lib/lwip/ulwip.h"
>
>  /** BOOTP EXTENTIONS **/
>
> @@ -438,7 +439,11 @@ int net_loop(enum proto_t protocol)
>  #endif
>
>       bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
> +#if defined(CONFIG_LWIP_LIB)
> +     if (!ulwip_enabled() || !ulwip_in_loop())
> +#endif
>       net_init();
> +
>       if (eth_is_on_demand_init()) {
>               eth_halt();
>               eth_set_current();
> @@ -619,10 +624,23 @@ restart:
>                */
>               eth_rx();
>
> +#if defined(CONFIG_LWIP_LIB)
> +             if (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;
> +                     }
> +             }
> +#endif
>               /*
>                *      Abort if ctrl-c was pressed.
>                */
>               if (ctrlc()) {
> +                     printf("-->enter ctrlc\n");
>                       /* cancel any ARP that may not have completed */
>                       net_arp_wait_packet_ip.s_addr = 0;
>
> @@ -1177,6 +1195,13 @@ void net_process_received_packet(uchar *in_packet, int len)
>       if (len < ETHER_HDR_SIZE)
>               return;
>
> +#if defined(CONFIG_LWIP_LIB)
> +     if (ulwip_enabled()) {
> +             uboot_lwip_poll();
> +             return;
> +     }
> +#endif
> +
>  #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
>       if (push_packet) {
>               (*push_packet)(in_packet, len);
> --
> 2.30.2
>

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