[PATCHv7,12/15] net/lwip: replace original net commands with lwip

diff --git a/boot/bootmeth_efi.c b/boot/bootmeth_efi.c
index ae936c8daa..52399d627c 100644
--- a/boot/bootmeth_efi.c
+++ b/boot/bootmeth_efi.c
@@ -20,6 +20,8 @@ 
 #include <mapmem.h>
 #include <mmc.h>
 #include <net.h>
+#include <net/lwip.h>
+#include <net/ulwip.h>
 #include <pxe_utils.h>
 #include <linux/sizes.h>
 
@@ -319,9 +321,7 @@  static int distro_efi_try_bootflow_files(struct udevice *dev,
 
 static int distro_efi_read_bootflow_net(struct bootflow *bflow)
 {
-	char file_addr[17], fname[256];
-	char *tftp_argv[] = {"tftp", file_addr, fname, NULL};
-	struct cmd_tbl cmdtp = {};	/* dummy */
+	char fname[256];
 	const char *addr_str, *fdt_addr_str;
 	int ret, arch, size;
 	ulong addr, fdt_addr;
@@ -368,7 +368,6 @@  static int distro_efi_read_bootflow_net(struct bootflow *bflow)
 	if (!fdt_addr_str)
 		return log_msg_ret("fdt", -EINVAL);
 	fdt_addr = hextoul(fdt_addr_str, NULL);
-	sprintf(file_addr, "%lx", fdt_addr);
 
 	/* We only allow the first prefix with PXE */
 	ret = distro_efi_get_fdt_name(fname, sizeof(fname), 0);
@@ -379,7 +378,16 @@  static int distro_efi_read_bootflow_net(struct bootflow *bflow)
 	if (!bflow->fdt_fname)
 		return log_msg_ret("fil", -ENOMEM);
 
-	if (!do_tftpb(&cmdtp, 0, 3, tftp_argv)) {
+	ret = ulwip_init();
+	if (ret)
+		return log_msg_ret("ulwip_init", ret);
+
+	ret = ulwip_tftp(fdt_addr, fname);
+	if (ret)
+		return log_msg_ret("ulwip_tftp", ret);
+
+	ret = ulwip_loop();
+	if (!ret) {
 		bflow->fdt_size = env_get_hex("filesize", 0);
 		bflow->fdt_addr = fdt_addr;
 	} else {
diff --git a/boot/bootmeth_pxe.c b/boot/bootmeth_pxe.c
index 8d489a11aa..fc6aabaa18 100644
--- a/boot/bootmeth_pxe.c
+++ b/boot/bootmeth_pxe.c
@@ -21,6 +21,8 @@ 
 #include <mapmem.h>
 #include <mmc.h>
 #include <net.h>
+#include <net/ulwip.h>
+#include <net/lwip.h>
 #include <pxe_utils.h>
 
 static int extlinux_pxe_getfile(struct pxe_context *ctx, const char *file_path,
@@ -116,18 +118,21 @@  static int extlinux_pxe_read_file(struct udevice *dev, struct bootflow *bflow,
 				  const char *file_path, ulong addr,
 				  ulong *sizep)
 {
-	char *tftp_argv[] = {"tftp", NULL, NULL, NULL};
-	struct pxe_context *ctx = dev_get_priv(dev);
-	char file_addr[17];
 	ulong size;
 	int ret;
 
-	sprintf(file_addr, "%lx", addr);
-	tftp_argv[1] = file_addr;
-	tftp_argv[2] = (void *)file_path;
+	ret = ulwip_init();
+	if (ret)
+		return log_msg_ret("ulwip_init", ret);
+
+	ret = ulwip_tftp(addr, file_path);
+	if (ret)
+		return log_msg_ret("ulwip_tftp", ret);
+
+	ret = ulwip_loop();
+	if (ret)
+		return log_msg_ret("ulwip_loop", ret);
 
-	if (do_tftpb(ctx->cmdtp, 0, 3, tftp_argv))
-		return -ENOENT;
 	ret = pxe_get_file_size(&size);
 	if (ret)
 		return log_msg_ret("tftp", ret);
diff --git a/cmd/net.c b/cmd/net.c
index d407d8320a..dc5a114309 100644
--- a/cmd/net.c
+++ b/cmd/net.c
@@ -22,6 +22,7 @@ 
 #include <net/udp.h>
 #include <net/sntp.h>
 #include <net/ncsi.h>
+#include <net/lwip.h>
 
 static int netboot_common(enum proto_t, struct cmd_tbl *, int, char * const []);
 
@@ -40,19 +41,9 @@  U_BOOT_CMD(
 #endif
 
 #ifdef CONFIG_CMD_TFTPBOOT
-int do_tftpb(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
-{
-	int ret;
-
-	bootstage_mark_name(BOOTSTAGE_KERNELREAD_START, "tftp_start");
-	ret = netboot_common(TFTPGET, cmdtp, argc, argv);
-	bootstage_mark_name(BOOTSTAGE_KERNELREAD_STOP, "tftp_done");
-	return ret;
-}
-
 #if IS_ENABLED(CONFIG_IPV6)
 U_BOOT_CMD(
-	tftpboot,	4,	1,	do_tftpb,
+	tftpboot,	4,	1, do_lwip_tftp,
 	"boot image via network using TFTP protocol\n"
 	"To use IPv6 add -ipv6 parameter or use IPv6 hostIPaddr framed "
 	"with [] brackets",
@@ -60,7 +51,7 @@  U_BOOT_CMD(
 );
 #else
 U_BOOT_CMD(
-	tftpboot,	3,	1,	do_tftpb,
+	tftpboot,	3,	1,  do_lwip_tftp,
 	"load file via network using TFTP protocol",
 	"[loadAddress] [[hostIPaddr:]bootfilename]"
 );
@@ -139,7 +130,7 @@  U_BOOT_CMD(dhcp6,	3,	1,	do_dhcp6,
 static int do_dhcp(struct cmd_tbl *cmdtp, int flag, int argc,
 		   char *const argv[])
 {
-	return netboot_common(DHCP, cmdtp, argc, argv);
+	return do_lwip_dhcp();
 }
 
 U_BOOT_CMD(
@@ -196,13 +187,11 @@  U_BOOT_CMD(
 #endif
 
 #if defined(CONFIG_CMD_WGET)
-static int do_wget(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[])
-{
-	return netboot_common(WGET, cmdtp, argc, argv);
-}
+int do_lwip_wget(struct cmd_tbl *cmdtp, int flag, int argc,
+		 char *const argv[]);
 
 U_BOOT_CMD(
-	wget,   3,      1,      do_wget,
+	wget,   3,      1, do_lwip_wget,
 	"boot image via network using HTTP protocol",
 	"[loadAddress] [[hostIPaddr:]path and image name]"
 );
@@ -456,28 +445,8 @@  static int netboot_common(enum proto_t proto, struct cmd_tbl *cmdtp, int argc,
 }
 
 #if defined(CONFIG_CMD_PING)
-static int do_ping(struct cmd_tbl *cmdtp, int flag, int argc,
-		   char *const argv[])
-{
-	if (argc < 2)
-		return CMD_RET_USAGE;
-
-	net_ping_ip = string_to_ip(argv[1]);
-	if (net_ping_ip.s_addr == 0)
-		return CMD_RET_USAGE;
-
-	if (net_loop(PING) < 0) {
-		printf("ping failed; host %s is not alive\n", argv[1]);
-		return CMD_RET_FAILURE;
-	}
-
-	printf("host %s is alive\n", argv[1]);
-
-	return CMD_RET_SUCCESS;
-}
-
 U_BOOT_CMD(
-	ping,	2,	1,	do_ping,
+	ping,	2,	1, do_lwip_ping,
 	"send ICMP ECHO_REQUEST to network host",
 	"pingAddress"
 );
@@ -601,45 +570,8 @@  U_BOOT_CMD(
 #endif
 
 #if defined(CONFIG_CMD_DNS)
-int do_dns(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
-{
-	if (argc == 1)
-		return CMD_RET_USAGE;
-
-	/*
-	 * We should check for a valid hostname:
-	 * - Each label must be between 1 and 63 characters long
-	 * - the entire hostname has a maximum of 255 characters
-	 * - only the ASCII letters 'a' through 'z' (case-insensitive),
-	 *   the digits '0' through '9', and the hyphen
-	 * - cannot begin or end with a hyphen
-	 * - no other symbols, punctuation characters, or blank spaces are
-	 *   permitted
-	 * but hey - this is a minimalist implmentation, so only check length
-	 * and let the name server deal with things.
-	 */
-	if (strlen(argv[1]) >= 255) {
-		printf("dns error: hostname too long\n");
-		return CMD_RET_FAILURE;
-	}
-
-	net_dns_resolve = argv[1];
-
-	if (argc == 3)
-		net_dns_env_var = argv[2];
-	else
-		net_dns_env_var = NULL;
-
-	if (net_loop(DNS) < 0) {
-		printf("dns lookup of %s failed, check setup\n", argv[1]);
-		return CMD_RET_FAILURE;
-	}
-
-	return CMD_RET_SUCCESS;
-}
-
 U_BOOT_CMD(
-	dns,	3,	1,	do_dns,
+	dns,	3,	1,	do_lwip_dns,
 	"lookup the IP of a hostname",
 	"hostname [envvar]"
 );
diff --git a/cmd/pxe.c b/cmd/pxe.c
index 677142520b..d44df428d2 100644
--- a/cmd/pxe.c
+++ b/cmd/pxe.c
@@ -8,6 +8,7 @@ 
 #include <command.h>
 #include <fs.h>
 #include <net.h>
+#include <net/lwip.h>
 #include <net6.h>
 #include <malloc.h>
 
@@ -29,21 +30,19 @@  const char *pxe_default_paths[] = {
 static int do_get_tftp(struct pxe_context *ctx, const char *file_path,
 		       char *file_addr, ulong *sizep)
 {
-	char *tftp_argv[] = {"tftp", NULL, NULL, NULL};
+	ulong addr;
+	char *end;
 	int ret;
-	int num_args;
 
-	tftp_argv[1] = file_addr;
-	tftp_argv[2] = (void *)file_path;
+	addr = hextoul(file_addr, &end);
+
 	if (ctx->use_ipv6) {
-		tftp_argv[3] = USE_IP6_CMD_PARAM;
-		num_args = 4;
-	} else {
-		num_args = 3;
+		/* @todo: check and fix me, here */
 	}
 
-	if (do_tftpb(ctx->cmdtp, 0, num_args, tftp_argv))
-		return -ENOENT;
+	ret = ulwip_tftp(addr, file_path);
+	if (ret)
+		return log_msg_ret("tftp", ret);
 
 	ret = pxe_get_file_size(sizep);
 	if (ret)
diff --git a/include/net.h b/include/net.h
index e254df7d7f..de7baeb121 100644
--- a/include/net.h
+++ b/include/net.h
@@ -54,8 +54,10 @@  struct in_addr {
 	__be32 s_addr;
 };
 
+int do_lwip_dhcp(void);
+
 /**
- * do_tftpb - Run the tftpboot command
+ * do_lwip_tftp - Run the tftpboot command
  *
  * @cmdtp: Command information for tftpboot
  * @flag: Command flags (CMD_FLAG_...)
@@ -63,7 +65,7 @@  struct in_addr {
  * @argv: List of arguments
  * Return: result (see enum command_ret_t)
  */
-int do_tftpb(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
+int do_lwip_tftp(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
 
 /**
  * dhcp_run() - Run DHCP on the current ethernet device
@@ -514,7 +516,7 @@  extern int		net_restart_wrap;	/* Tried all network devices */
 enum proto_t {
 	BOOTP, RARP, ARP, TFTPGET, DHCP, DHCP6, PING, PING6, DNS, NFS, CDP,
 	NETCONS, SNTP, TFTPSRV, TFTPPUT, LINKLOCAL, FASTBOOT_UDP, FASTBOOT_TCP,
-	WOL, UDP, NCSI, WGET, RS
+	WOL, UDP, NCSI, WGET, RS, LWIP
 };
 
 extern char	net_boot_file_name[1024];/* Boot File name */
diff --git a/include/net/ulwip.h b/include/net/ulwip.h
new file mode 100644
index 0000000000..e2a54bdce5
--- /dev/null
+++ b/include/net/ulwip.h
@@ -0,0 +1,76 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/**
+ * ulwip_init() - initialize lwIP network stack
+ *
+ * @return 0 if success, !0 if error
+ */
+int ulwip_init(void);
+
+/**
+ * ulwip_enabled() - check if lwIP network stack was initialized
+ *
+ * @return 1 lwip initialized, 0 if not yet initialized
+ */
+int ulwip_enabled(void);
+
+/**
+ * ulwip_in_loop() - lwIP controls packet net loop
+ *
+ * @return 1 lwIP owns packet loop, 0 lwip does not own packet loop
+ */
+int ulwip_in_loop(void);
+
+/**
+ * ulwip_loop_set() - make loop to be used by lwIP
+ *
+ * Function is used to make lwIP control network pool.
+ *
+ * @loop: 1. Rx packets go to lwIP 2. Rx packets go to the original stack.
+ */
+void ulwip_loop_set(int loop);
+
+/**
+ * ulwip_exit() - exit from lwIP with a return code
+ *
+ * Exit from lwIP application back to the U-Boot with specific error code.
+ *
+ * @err: Error code to return
+ */
+void ulwip_exit(int err);
+
+/**
+ * ulwip_poll() - polling function to feed lwIP with ethernet packet
+ *
+ * Function takes network packet and passes it to lwIP network stack
+ */
+void ulwip_poll(void);
+
+/**
+ * ulwip_app_get_err() - return error code from lwIP application
+ *
+ * @return error code
+ */
+int ulwip_app_get_err(void);
+
+/**
+ * ulwip_set_tmo() - set application timeout function to trap lwIP application
+ *
+ * lwIP cmd compatibility code does initialization for application then gives
+ * control to the packet loop. To keep ability for control return code and
+ * application state after application work special handler can be registered
+ * with this call.
+ *
+ * @tmo:  Function to call if timeout happen.
+ */
+void ulwip_set_tmo(int (*tmo)(void));
+
+/**
+ * ulwip_loop() - enter to packet polling loop
+ *
+ * When lwIP application did it's initialization stage, then it needs to enter
+ * to packet polling loop to grab rx packets.
+ *
+ * Returns:  0 if success, !0 if error
+ */
+int ulwip_loop(void);