1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
From 8585756342caa6d27008d1ad0c18023e4211a40a Mon Sep 17 00:00:00 2001
From: OpenWrt community <openwrt-devel@lists.openwrt.org>
Date: Wed, 13 Jul 2022 12:22:48 +0200
Subject: [PATCH] of/of_net: write back netdev MAC-address to device-tree
The label-mac logic relies on the mac-address property of a netdev
devices of-node. However, the mac address can also be stored as a
different property or read from e.g. an mtd device.
Create this node when reading a mac-address from OF if it does not
already exist and copy the mac-address used for the device to this
property. This way, the MAC address can be accessed using procfs.
---
net/core/of_net.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
--- a/net/core/of_net.c
+++ b/net/core/of_net.c
@@ -97,6 +97,27 @@ int of_get_mac_address_nvmem(struct devi
}
EXPORT_SYMBOL(of_get_mac_address_nvmem);
+static int of_add_mac_address(struct device_node *np, u8* addr)
+{
+ struct property *prop;
+
+ prop = kzalloc(sizeof(*prop), GFP_KERNEL);
+ if (!prop)
+ return -ENOMEM;
+
+ prop->name = "mac-address";
+ prop->length = ETH_ALEN;
+ prop->value = kmemdup(addr, ETH_ALEN, GFP_KERNEL);
+ if (!prop->value || of_update_property(np, prop))
+ goto free;
+
+ return 0;
+free:
+ kfree(prop->value);
+ kfree(prop);
+ return -ENOMEM;
+}
+
/**
* of_get_mac_address()
* @np: Caller's Device Node
@@ -132,17 +153,23 @@ int of_get_mac_address(struct device_nod
ret = of_get_mac_addr(np, "mac-address", addr);
if (!ret)
- return 0;
+ goto found;
ret = of_get_mac_addr(np, "local-mac-address", addr);
if (!ret)
- return 0;
+ goto found;
ret = of_get_mac_addr(np, "address", addr);
if (!ret)
- return 0;
+ goto found;
- return of_get_mac_address_nvmem(np, addr);
+ ret = of_get_mac_address_nvmem(np, addr);
+ if (ret)
+ return ret;
+
+found:
+ ret = of_add_mac_address(np, addr);
+ return ret;
}
EXPORT_SYMBOL(of_get_mac_address);
|