net-lwip: add TFTP support and tftpboot command

Implement do_tftpb(). This implementation of the tftp command
supports an optional port number. For example:

 tftp 192.168.0.30:9069:file.bin

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>

4 files changed, 285 insertions, 6 deletions

diff --git a/cmd/Kconfig b/cmd/Kconfig
index cf53022013d..9a8b5926ec9 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -2107,10 +2107,9 @@ config CMD_MDIO
 config CMD_TFTPBOOT
 	bool "tftp"
 	select PROT_UDP_LWIP if NET_LWIP
-	default n
+	default y
 	help
 	  tftpboot - load file via network using TFTP protocol
-	  Currently a placeholder (not implemented) when NET_LWIP=y.
 
 endif  # if CMD_NET
 
diff --git a/cmd/net-lwip.c b/cmd/net-lwip.c
index 82edb5fd2e6..80f0872bb8f 100644
--- a/cmd/net-lwip.c
+++ b/cmd/net-lwip.c
@@ -11,3 +11,11 @@ U_BOOT_CMD(
         "[loadAddress] [[hostIPaddr:]bootfilename]"
 );
 #endif
+
+#if defined(CONFIG_CMD_TFTPBOOT)
+U_BOOT_CMD(
+	tftpboot,	3,	0,	do_tftpb,
+	"boot image via network using TFTP protocol\n",
+	"[loadAddress] [[hostIPaddr:]bootfilename]"
+);
+#endif
diff --git a/net/lwip/dhcp.c b/net/lwip/dhcp.c
index 3c1eeaf9fb1..a91d7e1ca0f 100644
--- a/net/lwip/dhcp.c
+++ b/net/lwip/dhcp.c
@@ -116,11 +116,20 @@ int do_dhcp(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 int dhcp_run(ulong addr, const char *fname, bool autoload)
 {
 	char *dhcp_argv[] = {"dhcp", NULL, };
+#ifdef CONFIG_CMD_TFTPBOOT
+	char *tftp_argv[] = {"tftpboot", boot_file_name, NULL, };
+#endif
 	struct cmd_tbl cmdtp = {};	/* dummy */
 
 	if (autoload) {
-		/* Will be supported when TFTP is added */
+#ifdef CONFIG_CMD_TFTPBOOT
+		/* Assume DHCP was already performed */
+		if (boot_file_name[0])
+			return do_tftpb(&cmdtp, 0, 2, tftp_argv);
+		return 0;
+#else
 		return -EOPNOTSUPP;
+#endif
 	}
 
 	return do_dhcp(&cmdtp, 0, 1, dhcp_argv);
diff --git a/net/lwip/tftp.c b/net/lwip/tftp.c
index 1fa246f55d9..78de0bd0dba 100644
--- a/net/lwip/tftp.c
+++ b/net/lwip/tftp.c
@@ -2,10 +2,273 @@
 /* Copyright (C) 2024 Linaro Ltd. */
 
 #include <command.h>
-#include <net-lwip.h>
+#include <console.h>
+#include <display_options.h>
+#include <dm/device.h>
+#include <image.h>
+#include <linux/delay.h>
+#include <lwip/apps/tftp_client.h>
+#include <lwip/timeouts.h>
+#include <net.h>
+#include <time.h>
+
+#define PROGRESS_PRINT_STEP_BYTES (10 * 1024)
+
+enum done_state {
+	NOT_DONE = 0,
+	SUCCESS = 1,
+	FAILURE = 2
+};
+
+struct tftp_ctx {
+	ulong daddr;
+	ulong size;
+	ulong block_count;
+	ulong start_time;
+	enum done_state done;
+};
+
+static void *tftp_open(const char *fname, const char *mode, u8_t is_write)
+{
+	return NULL;
+}
+
+static void tftp_close(void *handle)
+{
+	struct tftp_ctx *ctx = handle;
+	ulong elapsed;
+
+	if (ctx->done == FAILURE) {
+		/* Closing after an error */
+		return;
+	}
+	ctx->done = SUCCESS;
+
+	elapsed = get_timer(ctx->start_time);
+	if (elapsed > 0) {
+		puts("\n\t ");	/* Line up with "Loading: " */
+		print_size(ctx->size / elapsed * 1000, "/s");
+	}
+	puts("\ndone\n");
+	printf("Bytes transferred = %lu (%lx hex)\n", ctx->size, ctx->size);
+
+	if (env_set_hex("filesize", ctx->size)) {
+		log_err("filesize not updated\n");
+		return;
+	}
+}
+
+static int tftp_read(void *handle, void *buf, int bytes)
+{
+	return 0;
+}
+
+static int tftp_write(void *handle, struct pbuf *p)
+{
+	struct tftp_ctx *ctx = handle;
+	struct pbuf *q;
+
+	for (q = p; q != NULL; q = q->next) {
+		memcpy((void *)ctx->daddr, q->payload, q->len);
+		ctx->daddr += q->len;
+		ctx->size += q->len;
+		ctx->block_count++;
+		if (ctx->block_count % 10 == 0) {
+			putc('#');
+			if (ctx->block_count % (65 * 10) == 0)
+				puts("\n\t ");
+		}
+	}
+
+	return 0;
+}
+
+static void tftp_error(void *handle, int err, const char *msg, int size)
+{
+	struct tftp_ctx *ctx = handle;
+	char message[100];
+
+	ctx->done = FAILURE;
+	memset(message, 0, sizeof(message));
+	memcpy(message, msg, LWIP_MIN(sizeof(message) - 1, (size_t)size));
+
+	printf("\nTFTP error: %d (%s)\n", err, message);
+}
+
+static const struct tftp_context tftp_context = {
+	tftp_open,
+	tftp_close,
+	tftp_read,
+	tftp_write,
+	tftp_error
+};
+
+static int tftp_loop(struct udevice *udev, ulong addr, char *fname,
+		     ip_addr_t srvip, uint16_t srvport)
+{
+	struct netif *netif;
+	struct tftp_ctx ctx;
+	err_t err;
+
+	if (!fname || addr == 0)
+		return -1;
+
+	if (!srvport)
+		srvport = TFTP_PORT;
+
+	netif = net_lwip_new_netif(udev);
+	if (!netif)
+		return -1;
+
+	ctx.done = NOT_DONE;
+	ctx.size = 0;
+	ctx.block_count = 0;
+	ctx.daddr = addr;
+
+	printf("Using %s device\n", udev->name);
+	printf("TFTP from server %s; our IP address is %s\n",
+		 ip4addr_ntoa(&srvip), env_get("ipaddr"));
+	printf("Filename '%s'.\n", fname);
+	printf("Load address: 0x%lx\n", ctx.daddr);
+	printf("Loading: ");
+
+	err = tftp_init_client(&tftp_context);
+	if (!(err == ERR_OK || err == ERR_USE))
+		log_err("tftp_init_client err: %d\n", err);
+
+	ctx.start_time = get_timer(0);
+	err = tftp_get(&ctx, &srvip, srvport, fname, TFTP_MODE_OCTET);
+	/* might return different errors, like routing problems */
+	if (err != ERR_OK) {
+		printf("tftp_get() error %d\n", err);
+		net_lwip_remove_netif(netif);
+		return -1;
+	}
+
+	while (!ctx.done) {
+		net_lwip_rx(udev, netif);
+		sys_check_timeouts();
+		if (ctrlc())
+			break;
+	}
+
+	tftp_cleanup();
+
+	net_lwip_remove_netif(netif);
+
+	if (ctx.done == SUCCESS) {
+		if (env_set_hex("fileaddr", addr)) {
+			log_err("fileaddr not updated\n");
+			return -1;
+		}
+		return 0;
+	}
+
+	return -1;
+}
 
 int do_tftpb(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
-	/* Not implemented */
-	return CMD_RET_FAILURE;
+	char *arg = NULL;
+	char *words[3] = { };
+	char *fname = NULL;
+	char *server_ip = NULL;
+	char *server_port = NULL;
+	char *end;
+	ip_addr_t srvip;
+	uint16_t port = TFTP_PORT;
+	ulong addr;
+	int ret;
+	int i;
+
+	image_load_addr = env_get_ulong("loadaddr", 16, image_load_addr);
+
+	switch (argc) {
+	case 1:
+		fname = 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;
+			fname = env_get("bootfile");
+		} else {
+			arg = strdup(argv[1]);
+		}
+		break;
+	case 3:
+		image_load_addr = hextoul(argv[1], NULL);
+		arg = strdup(argv[2]);
+		break;
+	default:
+		ret = CMD_RET_USAGE;
+		goto out;
+	}
+
+	if (arg) {
+		/* Parse [ip:[port:]]fname */
+		i = 0;
+		while ((*(words + i) = strsep(&arg,":")))
+			i++;
+
+		switch (i) {
+		case 3:
+			server_ip = words[0];
+			server_port = words[1];
+			fname = words[2];
+			break;
+		case 2:
+			server_ip = words[0];
+			fname = words[1];
+			break;
+		case 1:
+			fname = words[0];
+			break;
+		default:
+			break;
+		}
+	}
+
+	if (!server_ip)
+		server_ip = env_get("serverip");
+	if (!server_ip) {
+		log_err("error: serverip variable has to be set\n");
+		ret = CMD_RET_FAILURE;
+		goto out;
+	}
+
+	if (server_port)
+		port = dectoul(server_port, NULL);
+
+	if (!ipaddr_aton(server_ip, &srvip)) {
+		log_err("error: ipaddr_aton\n");
+		ret = CMD_RET_FAILURE;
+		goto out;
+	}
+
+	if (!fname) {
+		log_err("error: no file name\n");
+		ret = CMD_RET_FAILURE;
+		goto out;
+	}
+
+	if (!image_load_addr) {
+		log_err("error: no load address\n");
+		ret = CMD_RET_FAILURE;
+		goto out;
+	}
+
+	eth_set_current();
+
+	if (tftp_loop(eth_get_dev(), image_load_addr, fname, srvip, port) < 0)
+		ret = CMD_RET_FAILURE;
+out:
+	free(arg);
+	return ret;
 }