add dts config

hc

2023-12-06 08f87f769b595151be1afeff53e144f543faa614

 kernel/drivers/usb/gadget/function/u_ether.c
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@@ -80,6 +80,7 @@
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80
 
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 	bool			zlp;
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 	bool			no_skb_reserve;
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+	bool			ifname_set;
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 	u8			host_mac[ETH_ALEN];
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 	u8			dev_mac[ETH_ALEN];
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 };
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@@ -322,7 +323,7 @@
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 	/* data overrun */
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 	case -EOVERFLOW:
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 		dev->net->stats.rx_over_errors++;
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-		/* FALLTHROUGH */
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+		fallthrough;
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 	default:
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 		dev->net->stats.rx_errors++;
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@@ -445,7 +446,7 @@
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 	default:
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 		dev->net->stats.tx_errors++;
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 		VDBG(dev, "tx err %d\n", req->status);
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-		/* FALLTHROUGH */
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+		fallthrough;
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 	case -ECONNRESET:		/* unlink */
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 	case -ESHUTDOWN:		/* disconnect etc */
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 		dev_kfree_skb_any(skb);
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@@ -732,7 +733,7 @@
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 	.name	= "gadget",
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 };
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-/**
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+/*
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  * gether_setup_name - initialize one ethernet-over-usb link
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  * @g: gadget to associated with these links
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  * @ethaddr: NULL, or a buffer in which the ethernet address of the
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@@ -772,9 +773,13 @@
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 	dev->qmult = qmult;
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 	snprintf(net->name, sizeof(net->name), "%s%%d", netname);
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-	if (get_ether_addr(dev_addr, net->dev_addr))
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+	if (get_ether_addr(dev_addr, net->dev_addr)) {
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+		net->addr_assign_type = NET_ADDR_RANDOM;
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 		dev_warn(&g->dev,
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 			"using random %s ethernet address\n", "self");
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+	} else {
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+		net->addr_assign_type = NET_ADDR_SET;
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+	}
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 	if (get_ether_addr(host_addr, dev->host_mac))
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 		dev_warn(&g->dev,
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 			"using random %s ethernet address\n", "host");
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@@ -831,6 +836,9 @@
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 	INIT_LIST_HEAD(&dev->tx_reqs);
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 	INIT_LIST_HEAD(&dev->rx_reqs);
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+	/* by default we always have a random MAC address */
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+	net->addr_assign_type = NET_ADDR_RANDOM;
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+
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 	skb_queue_head_init(&dev->rx_frames);
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 	/* network device setup */
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@@ -868,7 +876,6 @@
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 	g = dev->gadget;
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 	memcpy(net->dev_addr, dev->dev_mac, ETH_ALEN);
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-	net->addr_assign_type = NET_ADDR_RANDOM;
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879
 
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 	status = register_netdev(net);
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 	if (status < 0) {
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@@ -908,6 +915,7 @@
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 	if (get_ether_addr(dev_addr, new_addr))
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 		return -EINVAL;
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 	memcpy(dev->dev_mac, new_addr, ETH_ALEN);
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+	net->addr_assign_type = NET_ADDR_SET;
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 	return 0;
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 }
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 EXPORT_SYMBOL_GPL(gether_set_dev_addr);
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@@ -1000,16 +1008,46 @@
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 int gether_get_ifname(struct net_device *net, char *name, int len)
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 {
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+	struct eth_dev *dev = netdev_priv(net);
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 	int ret;
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 	rtnl_lock();
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-	ret = snprintf(name, len, "%s\n", netdev_name(net));
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+	ret = scnprintf(name, len, "%s\n",
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+			dev->ifname_set ? net->name : netdev_name(net));
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 	rtnl_unlock();
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-	return ret < len ? ret : len;
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+	return ret;
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1019
 }
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 EXPORT_SYMBOL_GPL(gether_get_ifname);
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1021
 
1012
-/**
1022
+int gether_set_ifname(struct net_device *net, const char *name, int len)
1023
+{
1024
+	struct eth_dev *dev = netdev_priv(net);
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+	char tmp[IFNAMSIZ];
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+	const char *p;
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+
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+	if (name[len - 1] == '\n')
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+		len--;
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+
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+	if (len >= sizeof(tmp))
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+		return -E2BIG;
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+
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+	strscpy(tmp, name, len + 1);
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+	if (!dev_valid_name(tmp))
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+		return -EINVAL;
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+
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+	/* Require exactly one %d, so binding will not fail with EEXIST. */
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+	p = strchr(name, '%');
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+	if (!p || p[1] != 'd' || strchr(p + 2, '%'))
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+		return -EINVAL;
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+
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+	strncpy(net->name, tmp, sizeof(net->name));
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+	dev->ifname_set = true;
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+
1046
+	return 0;
1047
+}
1048
+EXPORT_SYMBOL_GPL(gether_set_ifname);
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+
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+/*
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  * gether_cleanup - remove Ethernet-over-USB device
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  * Context: may sleep
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  *