[PATCHv7 04/15] net/lwip: implement dhcp cmd

[Maxim Uvarov]

U-Boot recently got support for an alternative network stack using LWIP.
Replace dhcp command with the LWIP variant while keeping the output and
error messages identical.

Signed-off-by: Maxim Uvarov <maxim.uvarov at linaro.org>
---
 include/net/lwip.h             | 12 +++++++
 net/lwip/Makefile              |  1 +
 net/lwip/apps/dhcp/lwip-dhcp.c | 62 ++++++++++++++++++++++++++++++++++
 3 files changed, 75 insertions(+)
 create mode 100644 net/lwip/apps/dhcp/lwip-dhcp.c

diff --git a/include/net/lwip.h b/include/net/lwip.h
index cda896d062..240ebba354 100644
--- a/include/net/lwip.h
+++ b/include/net/lwip.h
@@ -17,3 +17,15 @@ int do_lwip_dns(struct cmd_tbl *cmdtp, int flag, int argc,
  *         Other value < 0, if error
  */
 int ulwip_dns(char *name, char *varname);
+
+/**
+ * ulwip_dhcp() -  create the DHCP request to obtain IP address.
+ *
+ * This function creates the DHCP request to obtain IP address. If DHCP server
+ * returns file name, this file will be downloaded with tftp.  After this
+ * function you need to invoke the polling loop to process network communication.
+ *
+ * Returns: 0 if success
+ *         Other value < 0, if error
+*/
+int ulwip_dhcp(void);
diff --git a/net/lwip/Makefile b/net/lwip/Makefile
index 6d2c00605b..59323fb325 100644
--- a/net/lwip/Makefile
+++ b/net/lwip/Makefile
@@ -65,4 +65,5 @@ obj-$(CONFIG_NET) += $(LWIPDIR)/netif/ethernet.o
 obj-$(CONFIG_NET) += port/if.o
 obj-$(CONFIG_NET) += port/sys-arch.o
 
+obj-$(CONFIG_CMD_DHCP) += apps/dhcp/lwip-dhcp.o
 obj-$(CONFIG_CMD_DNS) += apps/dns/lwip-dns.o
diff --git a/net/lwip/apps/dhcp/lwip-dhcp.c b/net/lwip/apps/dhcp/lwip-dhcp.c
new file mode 100644
index 0000000000..cce1e367f9
--- /dev/null
+++ b/net/lwip/apps/dhcp/lwip-dhcp.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * (C) Copyright 2023 Linaro Ltd. <maxim.uvarov at linaro.org>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <console.h>
+
+#include <lwip/dhcp.h>
+#include <lwip/prot/dhcp.h>
+
+#include <net/eth.h>
+#include <net/ulwip.h>
+
+static struct dhcp dhcp;
+
+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 -1;
+	}
+
+	return 0;
+}
+
+int ulwip_dhcp(void)
+{
+	int err;
+	struct netif *netif;
+	int eth_idx;
+
+	eth_idx = eth_get_dev_index();
+	if (eth_idx < 0) {
+		log_err("no eth idx\n");
+		return -1;
+	}
+
+	netif = netif_get_by_index(eth_idx + 1);
+	if (!netif)
+		return -1;
+
+	ulwip_set_tmo(ulwip_dhcp_tmo);
+
+	if (!netif_get_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_DHCP))
+		dhcp_set_struct(netif, &dhcp);
+
+	err = dhcp_start(netif);
+	if (err)
+		log_err("dhcp_start error %d\n", err);
+
+	return err;
+}
-- 
2.30.2