Merge tag 'net-20250818' of https://source.denx.de/u-boot/custodians/u-boot-net

Pull request net-20250818.

This is mostly code cleanup and fixes, mainly for issues reported by the
Smatch tool, plus two small features for NET_LWIP as well as support for
the BCM54612E phy.

net-common:
- Fix a bunch of issues reported by Smatch
- Introduce CONFIG_DNS
- Add support for BCM54612E phy

net-legacy:
- Add missing SPDX-License-Identifier for files originating from LiMon

net-lwip:
- ping: initialize net_try_count to 1
- sntp: remove redundant sys_check_timeouts()
- tftp: resend initial request
- Add Kconfig option to show ICMP unreachable errors

cmd/Kconfig

@@ -2117,7 +2117,7 @@ config CMD_DHCP
 
 config CMD_DNS
 	bool "dns"
-	select PROT_DNS_LWIP if NET_LWIP
+	select DNS
 	help
 	  Lookup the IP of a hostname
 

cmd/lwip/dns.c

@@ -2,115 +2,7 @@
 /* Copyright (C) 2024 Linaro Ltd. */
 
 #include <command.h>
-#include <console.h>
-#include <env.h>
-#include <lwip/dns.h>
-#include <lwip/timeouts.h>
 #include <net.h>
-#include <time.h>
 
 U_BOOT_CMD(dns, 3, 1, do_dns, "lookup the IP of a hostname",
 	   "hostname [envvar]");
-
-#define DNS_RESEND_MS 1000
-#define DNS_TIMEOUT_MS 10000
-
-struct dns_cb_arg {
-	ip_addr_t host_ipaddr;
-	const char *var;
-	bool done;
-};
-
-static void do_dns_tmr(void *arg)
-{
-	dns_tmr();
-}
-
-static void dns_cb(const char *name, const ip_addr_t *ipaddr, void *arg)
-{
-	struct dns_cb_arg *dns_cb_arg = arg;
-	char *ipstr = ip4addr_ntoa(ipaddr);
-
-	dns_cb_arg->done = true;
-
-	if (!ipaddr) {
-		printf("DNS: host not found\n");
-		dns_cb_arg->host_ipaddr.addr = 0;
-		return;
-	}
-
-	dns_cb_arg->host_ipaddr.addr = ipaddr->addr;
-
-	if (dns_cb_arg->var)
-		env_set(dns_cb_arg->var, ipstr);
-}
-
-static int dns_loop(struct udevice *udev, const char *name, const char *var)
-{
-	struct dns_cb_arg dns_cb_arg = { };
-	struct netif *netif;
-	ip_addr_t ipaddr;
-	ulong start;
-	int ret;
-
-	dns_cb_arg.var = var;
-
-	netif = net_lwip_new_netif(udev);
-	if (!netif)
-		return CMD_RET_FAILURE;
-
-	if (net_lwip_dns_init()) {
-		net_lwip_remove_netif(netif);
-		return CMD_RET_FAILURE;
-	}
-
-	dns_cb_arg.done = false;
-
-	ret = dns_gethostbyname(name, &ipaddr, dns_cb, &dns_cb_arg);
-
-	if (ret == ERR_OK) {
-		dns_cb(name, &ipaddr, &dns_cb_arg);
-	} else if (ret == ERR_INPROGRESS) {
-		start = get_timer(0);
-		sys_timeout(DNS_RESEND_MS, do_dns_tmr, NULL);
-		do {
-			net_lwip_rx(udev, netif);
-			if (dns_cb_arg.done)
-				break;
-			if (ctrlc()) {
-				printf("\nAbort\n");
-				break;
-			}
-		} while (get_timer(start) < DNS_TIMEOUT_MS);
-		sys_untimeout(do_dns_tmr, NULL);
-	}
-
-	net_lwip_remove_netif(netif);
-
-	if (dns_cb_arg.done && dns_cb_arg.host_ipaddr.addr != 0) {
-		if (!var)
-			printf("%s\n", ipaddr_ntoa(&ipaddr));
-		return CMD_RET_SUCCESS;
-	}
-
-	return CMD_RET_FAILURE;
-}
-
-int do_dns(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
-{
-	char *name;
-	char *var = NULL;
-
-	if (argc == 1 || argc > 3)
-		return CMD_RET_USAGE;
-
-	name = argv[1];
-
-	if (argc == 3)
-		var = argv[2];
-
-	if (net_lwip_eth_start() < 0)
-		return CMD_RET_FAILURE;
-
-	return dns_loop(eth_get_dev(), name, var);
-}

cmd/lwip/ping.c

@@ -170,6 +170,7 @@ int do_ping(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 	if (net_lwip_dns_resolve(argv[1], &addr))
 		return CMD_RET_USAGE;
 
+	net_try_count = 1;
 restart:
 	if (net_lwip_eth_start() < 0 || ping_loop(eth_get_dev(), &addr) < 0) {
 		if (net_start_again() == 0)

cmd/lwip/sntp.c

@@ -79,7 +79,6 @@ static int sntp_loop(struct udevice *udev, ip_addr_t *srvip)
 	sys_timeout(SNTP_TIMEOUT, no_response, NULL);
 	while (sntp_state == NOT_DONE) {
 		net_lwip_rx(udev, netif);
-		sys_check_timeouts();
 		if (ctrlc()) {
 			printf("\nAbort\n");
 			sntp_state = ABORTED;

doc/usage/cmd/sntp.rst

@@ -12,7 +12,7 @@ Synopsis
 ::
 
     sntp [serverip]
-    sntp [servername]  # NET_LWIP=y && CMD_DNS=y only
+    sntp [servername]  # NET_LWIP=y && DNS=y only
 
 
 Description
@@ -27,8 +27,8 @@ The address of the NTP server does not need to be given if the DHCP server
 provides one. The legacy network stack (`CONFIG_NET=y`) can only use the
 first NTP server provided in the `ntp-servers` DHCP option.
 
-When the network stack is lwIP (`CONFIG_NET_LWIP=y`) and the dns command
+When the network stack is lwIP (`CONFIG_NET_LWIP=y`) and DNS resolution
-is enabled (`CONFIG_CMD_DNS=y`), then the sntp command accepts a server
+is enabled (`CONFIG_DNS=y`), then the sntp command accepts a server
 name as an argument.
 
 The network time is sent as UTC. So, if you want to set the RTC to any local
@@ -61,7 +61,7 @@ Examples
     => date
     Date: 2025-06-16 (Monday)    Time: 17:19:57
 
-With `CONFIG_NET_LWIP=y` and `CONFIG_CMD_DNS=y`:
+With `CONFIG_NET_LWIP=y` and `CONFIG_DNS=y`:
 
 ::
 

doc/usage/cmd/wget.rst

@@ -38,7 +38,7 @@ address
     memory address for the data downloaded
 
 host
-    IP address (or host name if `CONFIG_CMD_DNS` is enabled) of the HTTP
+    IP address (or host name if `CONFIG_DNS` is enabled) of the HTTP
     server, defaults to the value of environment variable *serverip*.
 
 path

drivers/net/cortina_ni.c

@@ -499,7 +499,7 @@ static int ca_phy_probe(struct udevice *dev)
 				 dev, priv->phy_interface);
 	if (ext_phydev) {
 		ext_phydev->supported &= PHY_GBIT_FEATURES;
-		ext_phydev->advertising = int_phydev->supported;
+		ext_phydev->advertising = ext_phydev->supported;
 		phy_config(ext_phydev);
 	} else {
 		printf("CA NI %s: There is no external phy device\n", __func__);

drivers/net/designware.c

@@ -486,7 +486,7 @@ static int dw_adjust_link(struct dw_eth_dev *priv, struct eth_mac_regs *mac_p,
 
 #ifdef CONFIG_ARCH_NPCM8XX
 	if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
-		unsigned int start;
+		ulong start;
 
 		/* Indirect access to VR_MII_MMD registers */
 		writew((VR_MII_MMD >> 9), PCS_BA + PCS_IND_AC);
@@ -532,7 +532,7 @@ int designware_eth_init(struct dw_eth_dev *priv, u8 *enetaddr)
 {
 	struct eth_mac_regs *mac_p = priv->mac_regs_p;
 	struct eth_dma_regs *dma_p = priv->dma_regs_p;
-	unsigned int start;
+	ulong start;
 	int ret;
 
 	writel(readl(&dma_p->busmode) | DMAMAC_SRST, &dma_p->busmode);

drivers/net/ks8851_mll.c

@@ -347,11 +347,6 @@ static int ks8851_mll_detect_chip(struct ks_net *ks)
 
 	debug("Read back KS8851 id 0x%x\n", val);
 
-	if ((val & 0xfff0) != CIDER_ID) {
-		printf(DRIVERNAME ": Unknown chip ID %04x\n", val);
-		return -1;
-	}
-
 	return 0;
 }
 

drivers/net/ldpaa_eth/ldpaa_eth.c

@@ -458,7 +458,7 @@ static int ldpaa_eth_open(struct udevice *dev)
 	link_state.up == 1 ? printf("up\n") : printf("error state\n");
 #endif
 
-	memset(&d_queue, 0, sizeof(struct dpni_queue));
+	memset(&d_queue, 0, sizeof(struct dpni_queue_id));
 	err = dpni_get_queue(dflt_mc_io, MC_CMD_NO_FLAGS,
 			     dflt_dpni->dpni_handle, DPNI_QUEUE_RX,
 			     0, 0, &d_queue_cfg, &d_queue);

drivers/net/mtk_eth/mtk_eth.c

@@ -1461,7 +1461,7 @@ static int mtk_eth_of_to_plat(struct udevice *dev)
 		priv->phy_addr = ofnode_read_s32_default(args.node, "reg", -1);
 		if (priv->phy_addr < 0) {
 			printf("error: phy address is not specified\n");
-			return ret;
+			return priv->phy_addr;
 		}
 	}
 

drivers/net/mv88e6xxx.c

@@ -631,7 +631,7 @@ static int mv88e6xxx_port_enable(struct udevice *dev, int port, struct phy_devic
 			dev_dbg(dev, "configure internal RGMII delays\n");
 
 			/* RGMII delays */
-			val &= ~(PORT_REG_PHYS_CTRL_RGMII_DELAY_RXCLK ||
+			val &= ~(PORT_REG_PHYS_CTRL_RGMII_DELAY_RXCLK |
 				 PORT_REG_PHYS_CTRL_RGMII_DELAY_TXCLK);
 			if (phy->interface == PHY_INTERFACE_MODE_RGMII_ID ||
 			    phy->interface == PHY_INTERFACE_MODE_RGMII_RXID)

drivers/net/mvpp2.c

@@ -1722,8 +1722,7 @@ static struct mvpp2_prs_entry *mvpp2_prs_flow_find(struct mvpp2 *priv, int flow)
 }
 
 /* Return first free tcam index, seeking from start to end */
-static int mvpp2_prs_tcam_first_free(struct mvpp2 *priv, unsigned char start,
+static int mvpp2_prs_tcam_first_free(struct mvpp2 *priv, int start, int end)
-				     unsigned char end)
 {
 	int tid;
 
@@ -2330,7 +2329,7 @@ static int mvpp2_prs_mac_da_accept(struct mvpp2 *priv, int port,
 
 		pe = kzalloc(sizeof(*pe), GFP_KERNEL);
 		if (!pe)
-			return -1;
+			return -ENOMEM;
 		mvpp2_prs_tcam_lu_set(pe, MVPP2_PRS_LU_MAC);
 		pe->index = tid;
 
@@ -4735,7 +4734,7 @@ static int phy_info_parse(struct udevice *dev, struct mvpp2_port *port)
 	int port_node = dev_of_offset(dev);
 	int phy_node;
 	u32 id;
-	u32 phyaddr = 0;
+	int phyaddr = 0;
 	int fixed_link = 0;
 	int ret;
 
@@ -5354,7 +5353,7 @@ static int mvpp2_probe(struct udevice *dev)
 	} else {
 		port->gop_id = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
 					      "gop-port-id", -1);
-		if (port->id == -1) {
+		if (port->gop_id == -1) {
 			dev_err(dev, "missing gop-port-id value\n");
 			return -EINVAL;
 		}

drivers/net/octeontx/nicvf_main.c

@@ -232,7 +232,7 @@ static int nicvf_rcv_pkt_handler(struct nicvf *nic,
 
 	size_t pkt_len;
 	struct cqe_rx_t *cqe_rx = (struct cqe_rx_t *)cq_desc;
-	int err = 0;
+	int err;
 
 	/* Check for errors */
 	err = nicvf_check_cqe_rx_errs(nic, cq, cq_desc);
@@ -245,8 +245,7 @@ static int nicvf_rcv_pkt_handler(struct nicvf *nic,
 		return -1;
 	}
 
-	if (pkt)
+	*ppkt = pkt;
-		*ppkt = pkt;
 
 	return pkt_len;
 }
@@ -274,31 +273,29 @@ int nicvf_cq_handler(struct nicvf *nic, void **ppkt, int *pkt_len)
 	cqe_head >>= 9;
 	cqe_head &= 0xFFFF;
 
-	if (cqe_count) {
+	/* Get the CQ descriptor */
-		/* Get the CQ descriptor */
+	cq_desc = (struct cqe_rx_t *)GET_CQ_DESC(cq, cqe_head);
-		cq_desc = (struct cqe_rx_t *)GET_CQ_DESC(cq, cqe_head);
+	cqe_head++;
-		cqe_head++;
+	cqe_head &= (cq->dmem.q_len - 1);
-		cqe_head &= (cq->dmem.q_len - 1);
 
-		switch (cq_desc->cqe_type) {
+	switch (cq_desc->cqe_type) {
-		case CQE_TYPE_RX:
+	case CQE_TYPE_RX:
-			debug("%s: Got Rx CQE\n", nic->dev->name);
+		debug("%s: Got Rx CQE\n", nic->dev->name);
-			*pkt_len = nicvf_rcv_pkt_handler(nic, cq, cq_desc,
+		*pkt_len = nicvf_rcv_pkt_handler(nic, cq, cq_desc,
-							 ppkt, CQE_TYPE_RX);
+						 ppkt, CQE_TYPE_RX);
-			processed_rq_cqe++;
+		processed_rq_cqe++;
-			break;
+		break;
-		case CQE_TYPE_SEND:
+	case CQE_TYPE_SEND:
-			debug("%s: Got Tx CQE\n", nic->dev->name);
+		debug("%s: Got Tx CQE\n", nic->dev->name);
-			nicvf_snd_pkt_handler(nic, cq, cq_desc, CQE_TYPE_SEND);
+		nicvf_snd_pkt_handler(nic, cq, cq_desc, CQE_TYPE_SEND);
-			processed_sq_cqe++;
+		processed_sq_cqe++;
-			break;
+		break;
-		default:
+	default:
-			debug("%s: Got CQ type %u\n", nic->dev->name,
+		debug("%s: Got CQ type %u\n", nic->dev->name,
-			      cq_desc->cqe_type);
+		      cq_desc->cqe_type);
-			break;
+		break;
-		}
-		processed_cqe++;
 	}
+	processed_cqe++;
 
 	/* Dequeue CQE */
 	nicvf_queue_reg_write(nic, NIC_QSET_CQ_0_7_DOOR,

drivers/net/octeontx/smi.c

@@ -338,7 +338,8 @@ int octeontx_smi_probe(struct udevice *dev)
 		if (!bus || !priv) {
 			printf("Failed to allocate OcteonTX MDIO bus # %u\n",
 			       dev_seq(dev));
-			return -1;
+			ret = -ENOMEM;
+			goto error_ret;
 		}
 
 		bus->read = octeontx_phy_read;
@@ -355,9 +356,16 @@ int octeontx_smi_probe(struct udevice *dev)
 
 		ret = mdio_register(bus);
 		if (ret)
-			return ret;
+			goto error_ret;
 	}
 	return 0;
+
+error_ret:
+	if (bus)
+		free(bus);
+	if (priv)
+		free(priv);
+	return ret;
 }
 
 static const struct udevice_id octeontx_smi_ids[] = {

drivers/net/octeontx2/nix.c

@@ -298,6 +298,8 @@ int nix_lf_setup(struct nix *nix)
 			goto error;
 	}
 
+	err = -1;
+
 	/* Alloc memory for Qints HW contexts */
 	nix->qint_base = nix_memalloc(nix_af->qints, nix_af->qint_ctx_sz,
 				      "Qint CTX");

drivers/net/octeontx2/rvu_af.c

@@ -114,7 +114,7 @@ struct nix_af *rvu_af_init(struct rvu_af *rvu_af)
 	return nix_af;
 
 error:
-	if (nix_af->npa_af) {
+	if (nix_af && nix_af->npa_af) {
 		free(nix_af->npa_af);
 		memset(nix_af, 0, sizeof(*nix_af));
 	}

drivers/net/phy/broadcom.c

@@ -134,6 +134,33 @@ static void bcm_phy_write_misc(struct phy_device *phydev,
 	phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_EXP_DATA, value);
 }
 
+/* Broadcom BCM54612E */
+static int bcm54612e_config(struct phy_device *phydev)
+{
+	u32 reg = 0;
+
+	genphy_config_aneg(phydev);
+
+	phy_reset(phydev);
+
+	/* 125Mhz Clock Output Enable */
+	reg = phy_read(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_EXP_SEL);
+	reg |= 0xD34;
+	phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_EXP_SEL, reg);
+
+	reg = phy_read(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_EXP_DATA);
+	reg |= (1 << 1);
+	phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_EXP_DATA, reg);
+
+	reg = phy_read(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_EXP_SEL);
+	reg &= 0xfffff000;
+	phy_write(phydev, MDIO_DEVAD_NONE, MIIM_BCM54XX_EXP_SEL, reg);
+
+	genphy_restart_aneg(phydev);
+
+	return 0;
+}
+
 /* Broadcom BCM5461S */
 static int bcm5461_config(struct phy_device *phydev)
 {
@@ -434,6 +461,16 @@ U_BOOT_PHY_DRIVER(bcm5461s) = {
 	.shutdown = &genphy_shutdown,
 };
 
+U_BOOT_PHY_DRIVER(bcm54612e) = {
+	.name = "Broadcom BCM54612E",
+	.uid = 0x03625e6a,
+	.mask = 0xfffff0,
+	.features = PHY_GBIT_FEATURES,
+	.config = &bcm54612e_config,
+	.startup = &bcm54xx_startup,
+	.shutdown = &genphy_shutdown,
+};
+
 U_BOOT_PHY_DRIVER(bcm5464s) = {
 	.name = "Broadcom BCM5464S",
 	.uid = 0x2060b0,

drivers/net/phy/vitesse.c

@@ -239,7 +239,7 @@ static int vsc8514_config(struct phy_device *phydev)
 	while ((val & MIIM_VSC8514_18G_CMDSTAT) && timeout--)
 		val = phy_read(phydev, MDIO_DEVAD_NONE, MIIM_VSC8514_GENERAL18);
 
-	if (0 == timeout) {
+	if (timeout == -1) {
 		printf("PHY 8514 config failed\n");
 		return -1;
 	}

drivers/phy/cadence/phy-cadence-sierra.c

@@ -225,11 +225,6 @@ static const struct reg_field pllctrl_lock =
 static const struct reg_field phy_iso_link_ctrl_1 =
 				REG_FIELD(SIERRA_PHY_ISO_LINK_CTRL, 1, 1);
 
-static const char * const clk_names[] = {
-	[CDNS_SIERRA_PLL_CMNLC] = "pll_cmnlc",
-	[CDNS_SIERRA_PLL_CMNLC1] = "pll_cmnlc1",
-};
-
 enum cdns_sierra_cmn_plllc {
 	CMN_PLLLC,
 	CMN_PLLLC1,
@@ -602,7 +597,7 @@ static int cdns_sierra_pll_bind_of_clocks(struct cdns_sierra_phy *sp)
 	struct udevice *dev = sp->dev;
 	struct driver *cdns_sierra_clk_drv;
 	struct cdns_sierra_pll_mux_sel *data = pll_clk_mux_sel;
-	int i, rc;
+	int rc;
 
 	cdns_sierra_clk_drv = lists_driver_lookup_name("cdns_sierra_mux_clk");
 	if (!cdns_sierra_clk_drv) {
@@ -612,10 +607,8 @@ static int cdns_sierra_pll_bind_of_clocks(struct cdns_sierra_phy *sp)
 
 	rc = device_bind(dev, cdns_sierra_clk_drv, "pll_mux_clk",
 			 data, dev_ofnode(dev), NULL);
-	if (rc) {
+	if (rc)
-		dev_err(dev, "cannot bind driver for clock %s\n",
+		dev_err(dev, "cannot bind driver for clock pll_mux_clk\n");
-			clk_names[i]);
-	}
 
 	return 0;
 }

drivers/phy/cadence/phy-cadence-torrent.c

@@ -719,6 +719,7 @@ static int cdns_torrent_phy_probe(struct udevice *dev)
 
 	if (total_num_lanes > MAX_NUM_LANES) {
 		dev_err(dev, "Invalid lane configuration\n");
+		ret = -EINVAL;
 		goto put_lnk_rst;
 	}
 

drivers/phy/marvell/comphy_core.c

@@ -28,7 +28,7 @@ static const char *get_speed_string(u32 speed)
 		"10.3125 Gbps"
 	};
 
-	if (speed < 0 || speed > COMPHY_SPEED_MAX)
+	if (speed < 0 || speed >= COMPHY_SPEED_MAX)
 		return "invalid";
 
 	return speed_strings[speed];
@@ -44,7 +44,7 @@ static const char *get_type_string(u32 type)
 		"IGNORE"
 	};
 
-	if (type < 0 || type > COMPHY_TYPE_MAX)
+	if (type < 0 || type >= COMPHY_TYPE_MAX)
 		return "invalid";
 
 	return type_strings[type];

drivers/phy/marvell/comphy_core.h

@@ -47,8 +47,8 @@ struct chip_serdes_phy_config {
 	int (*rx_training)(struct chip_serdes_phy_config *, u32);
 	void __iomem *comphy_base_addr;
 	void __iomem *hpipe3_base_addr;
-	u32 comphy_lanes_count;
+	int comphy_lanes_count;
-	u32 comphy_mux_bitcount;
+	int comphy_mux_bitcount;
 	const fdt32_t *comphy_mux_lane_order;
 	u32 cp_index;
 	struct comphy_map comphy_map_data[MAX_LANE_OPTIONS];

include/net-legacy.h

@@ -1,9 +1,8 @@
-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  *	LiMon Monitor (LiMon) - Network.
  *
  *	Copyright 1994 - 2000 Neil Russell.
- *	(See License)
  *
  * History
  *	9/16/00	  bor  adapted to TQM823L/STK8xxL board, RARP/TFTP boot added
@@ -316,7 +315,7 @@ extern u32	net_boot_file_size;
 /* Boot file size in blocks as reported by the DHCP server */
 extern u32	net_boot_file_expected_size_in_blocks;
 
-#if defined(CONFIG_CMD_DNS)
+#if defined(CONFIG_DNS)
 extern char *net_dns_resolve;		/* The host to resolve  */
 extern char *net_dns_env_var;		/* the env var to put the ip into */
 #endif

include/net-lwip.h

@@ -18,6 +18,8 @@ extern size_t cacert_size;
 extern enum auth_mode cacert_auth_mode;
 extern bool cacert_initialized;
 
+extern int net_try_count;
+
 int set_cacert_builtin(void);
 
 enum proto_t {

include/net/tftp.h

@@ -1,10 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  *	LiMon - BOOTP/TFTP.
  *
  *	Copyright 1994, 1995, 2000 Neil Russell.
  *	Copyright 2011 Comelit Group SpA
  *	               Luca Ceresoli <luca.ceresoli@comelit.it>
- *	(See License)
  */
 
 #ifndef __TFTP_H__

lib/lwip/lwip/src/apps/tftp/tftp.c

@@ -79,6 +79,14 @@ enum tftp_error {
 
 #include <string.h>
 
+struct tftp_req {
+  ip_addr_t addr;
+  u16_t port;
+  u16_t opcode;
+  enum tftp_transfer_mode mode;
+  char* fname;
+};
+
 struct tftp_state {
   const struct tftp_context *ctx;
   void *handle;
@@ -97,14 +105,33 @@ struct tftp_state {
 };
 
 static struct tftp_state tftp_state;
+static struct tftp_req tftp_req;
 
 static void tftp_tmr(void *arg);
+static void tftp_req_tmr(void *arg);
+static const char *mode_to_string(enum tftp_transfer_mode mode);
+
+static void
+clear_req(void)
+{
+  ip_addr_set_any(0, &tftp_req.addr);
+  tftp_req.port = 0;
+  tftp_req.opcode = 0;
+  free(tftp_req.fname);
+  tftp_req.fname = NULL;
+  tftp_req.mode = 0;
+
+  sys_untimeout(tftp_req_tmr, NULL);
+}
 
 static void
 close_handle(void)
 {
+  clear_req();
+
   tftp_state.port = 0;
   ip_addr_set_any(0, &tftp_state.addr);
+  tftp_state.retries = 0;
 
   if (tftp_state.last_data != NULL) {
     pbuf_free(tftp_state.last_data);
@@ -209,6 +236,12 @@ send_ack(const ip_addr_t *addr, u16_t port, u16_t blknum)
   return ret;
 }
 
+static err_t
+resend_request(void)
+{
+  return send_request(&tftp_req.addr, tftp_req.port, tftp_req.opcode, tftp_req.fname, mode_to_string(tftp_req.mode));
+}
+
 static err_t
 resend_data(const ip_addr_t *addr, u16_t port)
 {
@@ -336,6 +369,9 @@ tftp_recv(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t *addr
   tftp_state.last_pkt = tftp_state.timer;
   tftp_state.retries = 0;
 
+  if (tftp_req.fname)
+    clear_req();
+
   switch (opcode) {
     case PP_HTONS(TFTP_RRQ): /* fall through */
     case PP_HTONS(TFTP_WRQ): {
@@ -542,6 +578,26 @@ tftp_tmr(void *arg)
   }
 }
 
+static void
+tftp_req_tmr(void *arg)
+{
+  if (tftp_state.handle == NULL) {
+    return;
+  }
+
+  sys_timeout(TFTP_TIMER_MSECS, tftp_req_tmr, NULL);
+
+  if (tftp_state.retries < TFTP_MAX_RETRIES) {
+    LWIP_DEBUGF(TFTP_DEBUG | LWIP_DBG_STATE, ("tftp: req timeout, retrying\n"));
+    resend_request();
+    tftp_state.retries++;
+  } else {
+    LWIP_DEBUGF(TFTP_DEBUG | LWIP_DBG_STATE, ("tftp: req timeout\n"));
+    tftp_state.ctx->error(tftp_state.handle, -1, "Request timeout", strlen("Request timeout"));
+    close_handle();
+  }
+}
+
 /**
  * Initialize TFTP client/server.
  * @param mode TFTP mode (client/server)
@@ -637,6 +693,20 @@ mode_to_string(enum tftp_transfer_mode mode)
   return NULL;
 }
 
+err_t
+start_send_requests(const ip_addr_t *addr, u16_t port, u16_t opcode, const char* fname, enum tftp_transfer_mode mode)
+{
+  tftp_req.addr = *addr;
+  tftp_req.port = port;
+  tftp_req.opcode = opcode;
+  tftp_req.fname = strdup(fname);
+  tftp_req.mode = mode;
+  if (!tftp_req.fname)
+    return ERR_MEM;
+  sys_timeout(TFTP_TIMER_MSECS, tftp_req_tmr, NULL);
+  return resend_request();
+}
+
 err_t
 tftp_get(void* handle, const ip_addr_t *addr, u16_t port, const char* fname, enum tftp_transfer_mode mode)
 {
@@ -647,7 +717,7 @@ tftp_get(void* handle, const ip_addr_t *addr, u16_t port, const char* fname, enu
   tftp_state.handle = handle;
   tftp_state.blknum = 1;
   tftp_state.mode_write = 1; /* We want to receive data */
-  return send_request(addr, port, TFTP_RRQ, fname, mode_to_string(mode));
+  return start_send_requests(addr, port, TFTP_RRQ, fname, mode);
 }
 
 err_t
@@ -660,7 +730,7 @@ tftp_put(void* handle, const ip_addr_t *addr, u16_t port, const char* fname, enu
   tftp_state.handle = handle;
   tftp_state.blknum = 1;
   tftp_state.mode_write = 0; /* We want to send data */
-  return send_request(addr, port, TFTP_WRQ, fname, mode_to_string(mode));
+  return start_send_requests(addr, port, TFTP_WRQ, fname, mode);
 }
 
 #endif /* LWIP_UDP */

lib/lwip/lwip/src/core/ipv4/icmp.c

@@ -80,9 +80,9 @@ void
 icmp_input(struct pbuf *p, struct netif *inp)
 {
   u8_t type;
-#ifdef LWIP_DEBUG
+#if defined(LWIP_DEBUG) || defined(ICMP_DEST_UNREACH_CB)
   u8_t code;
-#endif /* LWIP_DEBUG */
+#endif
   struct icmp_echo_hdr *iecho;
   const struct ip_hdr *iphdr_in;
   u16_t hlen;
@@ -103,11 +103,11 @@ icmp_input(struct pbuf *p, struct netif *inp)
   }
 
   type = *((u8_t *)p->payload);
-#ifdef LWIP_DEBUG
+#if defined(LWIP_DEBUG) || defined(ICMP_DEST_UNREACH_CB)
   code = *(((u8_t *)p->payload) + 1);
   /* if debug is enabled but debug statement below is somehow disabled: */
   LWIP_UNUSED_ARG(code);
-#endif /* LWIP_DEBUG */
+#endif
   switch (type) {
     case ICMP_ER:
       /* This is OK, echo reply might have been parsed by a raw PCB
@@ -257,6 +257,15 @@ icmp_input(struct pbuf *p, struct netif *inp)
     default:
       if (type == ICMP_DUR) {
         MIB2_STATS_INC(mib2.icmpindestunreachs);
+#ifdef ICMP_DEST_UNREACH_CB
+        /*
+         * The callback receives the IP packet (not the ICMP message) so that
+         * it can extract the source address for example
+         */
+        pbuf_add_header(p, IP_HLEN);
+        ICMP_DEST_UNREACH_CB(code, p);
+        pbuf_remove_header(p, IP_HLEN);
+#endif
       } else if (type == ICMP_TE) {
         MIB2_STATS_INC(mib2.icmpintimeexcds);
       } else if (type == ICMP_PP) {

lib/lwip/u-boot/arch/cc.h

@@ -56,4 +56,11 @@ static inline const char *sntp_format_time(time_t t)
 }
 
 #define sntp_format_time sntp_format_time
+
+#ifdef CONFIG_LWIP_ICMP_SHOW_UNREACH
+struct pbuf;
+void net_lwip_icmp_dest_unreach(int code, struct pbuf *p);
+
+#define ICMP_DEST_UNREACH_CB(_c, _p) net_lwip_icmp_dest_unreach(_c, _p)
+#endif
 #endif /* LWIP_ARCH_CC_H */

lib/lwip/u-boot/lwipopts.h

@@ -80,7 +80,11 @@
 
 #define IP_DEFAULT_TTL                  255
 
+#if defined(CONFIG_PROT_ICMP_LWIP)
+#define LWIP_ICMP                       1
+#else
 #define LWIP_ICMP                       0
+#endif
 
 #if defined(CONFIG_PROT_RAW_LWIP)
 #define LWIP_RAW                        1

net/Kconfig

@@ -244,11 +244,17 @@ config NET_RANDOM_ETHADDR
 	  generated. It will be saved to the appropriate environment variable,
 	  too.
 
+config DNS
+	bool "Enable DNS resolutions"
+	select PROT_DNS_LWIP if NET_LWIP
+	help
+	  Selecting this will allow the network stack to use server names
+	  in addition to IP addresses.
+
 config WGET
 	bool "Enable wget"
 	select PROT_TCP if NET
 	select PROT_TCP_LWIP if NET_LWIP
-	select PROT_DNS_LWIP if NET_LWIP
 	help
 	  Selecting this will enable wget, an interface to send HTTP requests
 	  via the network stack.

net/Makefile

@@ -10,7 +10,7 @@ ifeq ($(CONFIG_NET),y)
 obj-$(CONFIG_NET)      += arp.o
 obj-$(CONFIG_CMD_BOOTP) += bootp.o
 obj-$(CONFIG_CMD_CDP)  += cdp.o
-obj-$(CONFIG_CMD_DNS)  += dns.o
+obj-$(CONFIG_DNS)  += dns.o
 obj-$(CONFIG_CMD_LINK_LOCAL) += link_local.o
 obj-$(CONFIG_IPV6)     += ndisc.o
 obj-$(CONFIG_$(PHASE_)DM_ETH) += net.o

net/arp.c

@@ -1,9 +1,8 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *	Copied from Linux Monitor (LiMon) - Networking.
  *
  *	Copyright 1994 - 2000 Neil Russell.
- *	(See License)
  *	Copyright 2000 Roland Borde
  *	Copyright 2000 Paolo Scaffardi
  *	Copyright 2000-2002 Wolfgang Denk, wd@denx.de

net/arp.h

@@ -1,9 +1,8 @@
-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  *	Copied from Linux Monitor (LiMon) - Networking.
  *
  *	Copyright 1994 - 2000 Neil Russell.
- *	(See License)
  *	Copyright 2000 Roland Borde
  *	Copyright 2000 Paolo Scaffardi
  *	Copyright 2000-2002 Wolfgang Denk, wd@denx.de

net/bootp.c

@@ -1,8 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  *	Based on LiMon - BOOTP.
  *
  *	Copyright 1994, 1995, 2000 Neil Russell.
- *	(See License)
  *	Copyright 2000 Roland Borde
  *	Copyright 2000 Paolo Scaffardi
  *	Copyright 2000-2004 Wolfgang Denk, wd@denx.de

net/bootp.h

@@ -1,8 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  *	Copied from LiMon - BOOTP.
  *
  *	Copyright 1994, 1995, 2000 Neil Russell.
- *	(See License)
  *	Copyright 2000 Paolo Scaffardi
  */
 

net/cdp.c

@@ -1,9 +1,8 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *	Copied from Linux Monitor (LiMon) - Networking.
  *
  *	Copyright 1994 - 2000 Neil Russell.
- *	(See License)
  *	Copyright 2000 Roland Borde
  *	Copyright 2000 Paolo Scaffardi
  *	Copyright 2000-2002 Wolfgang Denk, wd@denx.de

net/cdp.h

@@ -1,9 +1,8 @@
-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  *	Copied from Linux Monitor (LiMon) - Networking.
  *
  *	Copyright 1994 - 2000 Neil Russell.
- *	(See License)
  *	Copyright 2000 Roland Borde
  *	Copyright 2000 Paolo Scaffardi
  *	Copyright 2000-2002 Wolfgang Denk, wd@denx.de

net/lwip/Kconfig

@@ -4,6 +4,16 @@
 
 if NET_LWIP
 
+config LWIP_ICMP_SHOW_UNREACH
+	bool "Print ICMP Destination Unreachable messages"
+	default y
+	depends on CMD_TFTPBOOT || CMD_SNTP
+	select PROT_ICMP_LWIP
+	help
+	  Prints a message whenever an ICMP Destination Unreachable message is
+	  received while running a network command that sends requests via UDP.
+	  Enabling this can make troubleshooting easier.
+
 config LWIP_DEBUG
 	bool "Enable debug traces in the lwIP library"
 	help
@@ -31,6 +41,9 @@ config PROT_DNS_LWIP
 	bool
 	select PROT_UDP_LWIP
 
+config PROT_ICMP_LWIP
+	bool
+
 config PROT_RAW_LWIP
 	bool
 

net/lwip/Makefile

@@ -2,6 +2,8 @@ ccflags-y += -I$(srctree)/lib/lwip/lwip/src/include -I$(srctree)/lib/lwip/u-boot
 
 obj-$(CONFIG_$(PHASE_)DM_ETH) += net-lwip.o
 obj-$(CONFIG_CMD_DHCP) += dhcp.o
+obj-$(CONFIG_DNS) += dns.o
+obj-$(CONFIG_LWIP_ICMP_SHOW_UNREACH) += icmp_unreach.o
 obj-$(CONFIG_CMD_TFTPBOOT) += tftp.o
 obj-$(CONFIG_WGET) += wget.o
 

net/lwip/dns.c

@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (C) 2024 Linaro Ltd. */
+
+#include <command.h>
+#include <console.h>
+#include <env.h>
+#include <lwip/dns.h>
+#include <lwip/timeouts.h>
+#include <net.h>
+#include <time.h>
+
+#define DNS_RESEND_MS 1000
+#define DNS_TIMEOUT_MS 10000
+
+struct dns_cb_arg {
+	ip_addr_t host_ipaddr;
+	const char *var;
+	bool done;
+};
+
+static void do_dns_tmr(void *arg)
+{
+	dns_tmr();
+}
+
+static void dns_cb(const char *name, const ip_addr_t *ipaddr, void *arg)
+{
+	struct dns_cb_arg *dns_cb_arg = arg;
+	char *ipstr = ip4addr_ntoa(ipaddr);
+
+	dns_cb_arg->done = true;
+
+	if (!ipaddr) {
+		printf("DNS: host not found\n");
+		dns_cb_arg->host_ipaddr.addr = 0;
+		return;
+	}
+
+	dns_cb_arg->host_ipaddr.addr = ipaddr->addr;
+
+	if (dns_cb_arg->var)
+		env_set(dns_cb_arg->var, ipstr);
+}
+
+static int dns_loop(struct udevice *udev, const char *name, const char *var)
+{
+	struct dns_cb_arg dns_cb_arg = { };
+	struct netif *netif;
+	ip_addr_t ipaddr;
+	ulong start;
+	int ret;
+
+	dns_cb_arg.var = var;
+
+	netif = net_lwip_new_netif(udev);
+	if (!netif)
+		return CMD_RET_FAILURE;
+
+	if (net_lwip_dns_init()) {
+		net_lwip_remove_netif(netif);
+		return CMD_RET_FAILURE;
+	}
+
+	dns_cb_arg.done = false;
+
+	ret = dns_gethostbyname(name, &ipaddr, dns_cb, &dns_cb_arg);
+
+	if (ret == ERR_OK) {
+		dns_cb(name, &ipaddr, &dns_cb_arg);
+	} else if (ret == ERR_INPROGRESS) {
+		start = get_timer(0);
+		sys_timeout(DNS_RESEND_MS, do_dns_tmr, NULL);
+		do {
+			net_lwip_rx(udev, netif);
+			if (dns_cb_arg.done)
+				break;
+			if (ctrlc()) {
+				printf("\nAbort\n");
+				break;
+			}
+		} while (get_timer(start) < DNS_TIMEOUT_MS);
+		sys_untimeout(do_dns_tmr, NULL);
+	}
+
+	net_lwip_remove_netif(netif);
+
+	if (dns_cb_arg.done && dns_cb_arg.host_ipaddr.addr != 0) {
+		if (!var)
+			printf("%s\n", ipaddr_ntoa(&ipaddr));
+		return CMD_RET_SUCCESS;
+	}
+
+	return CMD_RET_FAILURE;
+}
+
+int do_dns(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
+{
+	char *name;
+	char *var = NULL;
+
+	if (argc == 1 || argc > 3)
+		return CMD_RET_USAGE;
+
+	name = argv[1];
+
+	if (argc == 3)
+		var = argv[2];
+
+	if (net_lwip_eth_start() < 0)
+		return CMD_RET_FAILURE;
+
+	return dns_loop(eth_get_dev(), name, var);
+}

net/lwip/icmp_unreach.c

@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (C) 2025 Linaro Ltd. */
+
+#include <lwip/icmp.h>
+#include <lwip/ip4_addr.h>
+#include <lwip/pbuf.h>
+#include <lwip/prot/ip4.h>
+
+static const char *code_to_str(int code)
+{
+	switch (code) {
+	case ICMP_DUR_NET:
+		return "network unreachable";
+	case ICMP_DUR_HOST:
+		return "host unreachable";
+	case ICMP_DUR_PROTO:
+		return "protocol unreachable";
+	case ICMP_DUR_PORT:
+		return "port unreachable";
+	case ICMP_DUR_FRAG:
+		return "fragmentation needed and DF set";
+	case ICMP_DUR_SR:
+		return "source route failed";
+	default:
+		break;
+	}
+	return "unknown cause";
+}
+
+void net_lwip_icmp_dest_unreach(int code, struct pbuf *p)
+{
+	struct ip_hdr *iphdr = (struct ip_hdr *)p->payload;
+	ip4_addr_t src;
+
+	ip4_addr_copy(src, iphdr->src);
+	printf("ICMP destination unreachable (%s) from %s\n",
+	       code_to_str(code), ip4addr_ntoa(&src));
+}

net/lwip/net-lwip.c

@@ -27,7 +27,7 @@
 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
 void (*push_packet)(void *, int len) = 0;
 #endif
-static int net_try_count;
+int net_try_count;
 static int net_restarted;
 int net_restart_wrap;
 static uchar net_pkt_buf[(PKTBUFSRX) * PKTSIZE_ALIGN + PKTALIGN];
@@ -147,7 +147,7 @@ static int get_udev_ipv4_info(struct udevice *dev, ip4_addr_t *ip,
  */
 int net_lwip_dns_init(void)
 {
-#if CONFIG_IS_ENABLED(CMD_DNS)
+#if CONFIG_IS_ENABLED(DNS)
 	bool has_server = false;
 	ip_addr_t ns;
 	char *nsenv;
@@ -364,7 +364,7 @@ int net_lwip_rx(struct udevice *udev, struct netif *netif)
  */
 int net_lwip_dns_resolve(char *name_or_ip, ip_addr_t *ip)
 {
-#if defined(CONFIG_CMD_DNS)
+#if defined(CONFIG_DNS)
 	char *var = "_dnsres";
 	char *argv[] = { "dns", name_or_ip, var, NULL };
 	int argc = ARRAY_SIZE(argv) - 1;
@@ -373,7 +373,7 @@ int net_lwip_dns_resolve(char *name_or_ip, ip_addr_t *ip)
 	if (ipaddr_aton(name_or_ip, ip))
 		return 0;
 
-#if defined(CONFIG_CMD_DNS)
+#if defined(CONFIG_DNS)
 	if (do_dns(NULL, 0, argc, argv) != CMD_RET_SUCCESS)
 		return -1;
 

net/net.c

@@ -1,9 +1,8 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *	Copied from Linux Monitor (LiMon) - Networking.
  *
  *	Copyright 1994 - 2000 Neil Russell.
- *	(See License)
  *	Copyright 2000 Roland Borde
  *	Copyright 2000 Paolo Scaffardi
  *	Copyright 2000-2002 Wolfgang Denk, wd@denx.de
@@ -115,7 +114,7 @@
 #include "bootp.h"
 #include "cdp.h"
 #include "dhcpv6.h"
-#if defined(CONFIG_CMD_DNS)
+#if defined(CONFIG_DNS)
 #include "dns.h"
 #endif
 #include "link_local.h"
@@ -288,7 +287,7 @@ static int on_vlan(const char *name, const char *value, enum env_op op,
 }
 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
 
-#if defined(CONFIG_CMD_DNS)
+#if defined(CONFIG_DNS)
 static int on_dnsip(const char *name, const char *value, enum env_op op,
 	int flags)
 {
@@ -582,7 +581,7 @@ restart:
 			nc_start();
 			break;
 #endif
-#if defined(CONFIG_CMD_DNS)
+#if defined(CONFIG_DNS)
 		case DNS:
 			dns_start();
 			break;
@@ -1507,7 +1506,7 @@ static int net_check_prereq(enum proto_t protocol)
 		}
 		goto common;
 #endif
-#if defined(CONFIG_CMD_DNS)
+#if defined(CONFIG_DNS)
 	case DNS:
 		if (net_dns_server.s_addr == 0) {
 			puts("*** ERROR: DNS server address not given\n");
@@ -1540,7 +1539,7 @@ static int net_check_prereq(enum proto_t protocol)
 			return 1;
 		}
 #if	defined(CONFIG_CMD_PING) || \
-	defined(CONFIG_CMD_DNS) || defined(CONFIG_PROT_UDP)
+	defined(CONFIG_DNS) || defined(CONFIG_PROT_UDP)
 common:
 #endif
 		/* Fall through */

net/net_rand.h

@@ -1,8 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  *	Copied from LiMon - BOOTP.
  *
  *	Copyright 1994, 1995, 2000 Neil Russell.
- *	(See License)
  *	Copyright 2000 Paolo Scaffardi
  */
 

net/ping.c

@@ -1,9 +1,8 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *	Copied from Linux Monitor (LiMon) - Networking.
  *
  *	Copyright 1994 - 2000 Neil Russell.
- *	(See License)
  *	Copyright 2000 Roland Borde
  *	Copyright 2000 Paolo Scaffardi
  *	Copyright 2000-2002 Wolfgang Denk, wd@denx.de

net/ping.h

@@ -1,9 +1,8 @@
-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  *	Copied from Linux Monitor (LiMon) - Networking.
  *
  *	Copyright 1994 - 2000 Neil Russell.
- *	(See License)
  *	Copyright 2000 Roland Borde
  *	Copyright 2000 Paolo Scaffardi
  *	Copyright 2000-2002 Wolfgang Denk, wd@denx.de

net/wget.c

@@ -393,7 +393,7 @@ int wget_do_request(ulong dst_addr, char *uri)
 	if (string_to_ip(host_name).s_addr) {
 		s = host_name;
 	} else {
-#if IS_ENABLED(CONFIG_CMD_DNS)
+#if IS_ENABLED(CONFIG_DNS)
 		net_dns_resolve = host_name;
 		net_dns_env_var = "httpserverip";
 		if (net_loop(DNS) < 0) {