[PATCH v2] cmd: net: add a 'net list' command to list network devs

[Tim Harvey]

In a system with multiple network controllers it can be difficult
to know the names of the various devices available. This is especially
true for USB ether devices as they do not display device names upon
detection.

This is being added as a net sub-system in case other commands may
want to be added or moved here.

Example:
U-Boot > net
net - NET sub-system

Usage:
net list - list available devices

U-Boot > net list
eth0 : ethernet at 2188000 00:d0:12:98:f5:47 active
eth1 : e1000#0 00:d0:12:98:f5:48
eth2 : asix_eth 8c:ae:4c:f5:84:9d
eth3 : asix_eth 8c:ae:4c:f9:41:e3

Signed-off-by: Tim Harvey <tharvey at gateworks.com>
Reviewed-by: Stefan Roese <sr at denx.de>
Reviewed-by: Ramon Fried <rfried.dev at gmail.com>

---
v2: added Reviewed-by tags
---
 cmd/net.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/cmd/net.c b/cmd/net.c
index beb2877dfd..e51bc443f7 100644
--- a/cmd/net.c
+++ b/cmd/net.c
@@ -10,6 +10,7 @@
 #include <common.h>
 #include <bootstage.h>
 #include <command.h>
+#include <dm.h>
 #include <env.h>
 #include <image.h>
 #include <net.h>
@@ -480,3 +481,46 @@ U_BOOT_CMD(
 );
 
 #endif  /* CONFIG_CMD_LINK_LOCAL */
+
+static int do_net_list(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
+{
+	const struct udevice *current = eth_get_dev();
+	unsigned char env_enetaddr[ARP_HLEN];
+	const struct udevice *dev;
+	struct uclass *uc;
+
+	uclass_id_foreach_dev(UCLASS_ETH, dev, uc) {
+		eth_env_get_enetaddr_by_index("eth", dev_seq(dev), env_enetaddr);
+		printf("eth%d : %s %pM %s\n", dev_seq(dev), dev->name, env_enetaddr,
+		       current == dev ? "active" : "");
+	}
+	return CMD_RET_SUCCESS;
+}
+
+static struct cmd_tbl cmd_net[] = {
+	U_BOOT_CMD_MKENT(list, 1, 0, do_net_list, "", ""),
+};
+
+static int do_net(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
+{
+	struct cmd_tbl *cp;
+
+	cp = find_cmd_tbl(argv[1], cmd_net, ARRAY_SIZE(cmd_net));
+
+	/* Drop the net command */
+	argc--;
+	argv++;
+
+	if (!cp || argc > cp->maxargs)
+		return CMD_RET_USAGE;
+	if (flag == CMD_FLAG_REPEAT && !cmd_is_repeatable(cp))
+		return CMD_RET_SUCCESS;
+
+	return cp->cmd(cmdtp, flag, argc, argv);
+}
+
+U_BOOT_CMD(
+	net, 2, 1, do_net,
+	"NET sub-system",
+	"list - list available devices\n"
+);
-- 
2.17.1