[PATCH v3 04/12] net-lwip: add TFTP support and tftpboot command

Jerome Forissier jerome.forissier at linaro.org
Thu Jun 6 15:35:59 CEST 2024


Implement do_tftpb().

Signed-off-by: Jerome Forissier <jerome.forissier at linaro.org>
---
 cmd/Kconfig     |   3 +-
 cmd/net-lwip.c  |   8 ++
 net-lwip/dhcp.c |  11 ++-
 net-lwip/tftp.c | 202 +++++++++++++++++++++++++++++++++++++++++++++++-
 4 files changed, 219 insertions(+), 5 deletions(-)

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 1bfa528e945..94a8de266f6 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -2101,10 +2101,9 @@ config CMD_DHCP
 config CMD_TFTPBOOT
 	bool "tftp"
 	select PROT_UDP_LWIP
-	default n
+	default y
 	help
 	  tftpboot - load file via network using TFTP protocol
-	  Currently a placeholder (not implemented)
 
 endif
 
diff --git a/cmd/net-lwip.c b/cmd/net-lwip.c
index 966d7226eda..490a2e4ac5c 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 d1d35999b04..7bacc234f1e 100644
--- a/net-lwip/dhcp.c
+++ b/net-lwip/dhcp.c
@@ -94,11 +94,20 @@ 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..02ee4aacca5 100644
--- a/net-lwip/tftp.c
+++ b/net-lwip/tftp.c
@@ -2,10 +2,208 @@
 /* Copyright (C) 2024 Linaro Ltd. */
 
 #include <command.h>
+#include <console.h>
+#include <image.h>
+#include <linux/delay.h>
+#include <lwip/apps/tftp_client.h>
+#include <lwip/timeouts.h>
 #include <net-lwip.h>
+#include <time.h>
+
+static ulong daddr;
+static ulong size;
+static ulong prevsize;
+#define PROGRESS_PRINT_STEP_BYTES (100 * 1024)
+static ulong start_time;
+static enum done_state {
+	NOT_DONE = 0,
+	SUCCESS = 1,
+	FAILURE = 2
+} done;
+
+static void *tftp_open(const char *fname, const char *mode, u8_t is_write)
+{
+	return NULL;
+}
+
+static void tftp_close(void *handle)
+{
+	ulong elapsed;
+
+	if (done == FAILURE) {
+		/* Closing after an error */
+		return;
+	}
+
+	elapsed = get_timer(start_time);
+	done = SUCCESS;
+	printf("\nBytes transferred = %lu (%lx hex)\n", size, size);
+
+	if (env_set_hex("filesize", 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 pbuf *q;
+
+	for (q = p; q != NULL; q = q->next) {
+		memcpy((void *)daddr, q->payload, q->len);
+		daddr += q->len;
+		size += q->len;
+		if (size - prevsize > PROGRESS_PRINT_STEP_BYTES) {
+			printf("#");
+			prevsize = size;
+		}
+	}
+
+	return 0;
+}
+
+static void tftp_error(void *handle, int err, const char *msg, int size)
+{
+	char message[100];
+
+	done = FAILURE;
+	memset(message, 0, sizeof(message));
+	memcpy(message, msg, LWIP_MIN(sizeof(message) - 1, (size_t)size));
+
+	log_info("\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_run(ulong addr, char *fname, ip_addr_t srvip)
+{
+	void *f = (void *)0x1; /* unused fake file handle*/
+	err_t err;
+
+	if (!fname || addr == 0)
+		return -1;
+
+	done = NOT_DONE;
+	size = 0;
+	prevsize = 0;
+	daddr = addr;
+
+	log_info("TFTP from server %s; our IP address is %s\n",
+		 ip4addr_ntoa(&srvip), env_get("ipaddr"));
+	log_info("Filename '%s'.\n", fname);
+	log_info("Load address: 0x%lx\n", daddr);
+	log_info("Loading: ");
+
+	err = tftp_init_client(&tftp_context);
+	if (!(err == ERR_OK || err == ERR_USE))
+		log_err("tftp_init_client err: %d\n", err);
+
+	start_time = get_timer(0);
+	err = tftp_get(f, &srvip, TFTP_PORT, fname, TFTP_MODE_OCTET);
+	/* might return different errors, like routing problems */
+	if (err != ERR_OK) {
+		log_err("tftp_get err=%d\n", err);
+		return -1;
+	}
+
+	while (!done) {
+		eth_rx();
+		sys_check_timeouts();
+		if (ctrlc())
+			break;
+	}
+
+	tftp_cleanup();
+
+	if (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 *fname;
+	char *server_ip;
+	ip_addr_t srvip;
+	ulong addr;
+	char *end;
+	char *col;
+
+	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 {
+			fname = argv[1];
+		}
+		break;
+	case 3:
+		image_load_addr = hextoul(argv[1], NULL);
+		fname = argv[2];
+		break;
+	default:
+		return CMD_RET_USAGE;
+	}
+
+	col = strchr(fname, ':');
+	if (col) {
+		server_ip = fname;
+		*col = '\0';
+		fname = col + 1;
+	} else {
+		server_ip = env_get("serverip");
+		if (!server_ip) {
+			log_err("error: serverip variable has to be set\n");
+			return CMD_RET_FAILURE;
+		}
+	}
+	if (!ipaddr_aton(server_ip, &srvip)) {
+		log_err("error: ipaddr_aton\n");
+		return CMD_RET_FAILURE;
+	}
+
+	if (!fname) {
+		log_err("error: no file name\n");
+		return CMD_RET_FAILURE;
+	}
+
+	if (!image_load_addr) {
+		log_err("error: no load address\n");
+		return CMD_RET_FAILURE;
+	}
+
+	if (tftp_run(image_load_addr, fname, srvip) < 0)
+		return CMD_RET_FAILURE;
+
+	return CMD_RET_SUCCESS;
 }
-- 
2.40.1



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