netdev - [PATCH] drivers/net/usb/r8152: Enable MAC address passthru support

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Date:   Tue, 28 Jun 2022 09:53:25 +0800
From:   Franklin Lin <franklin_lin@...tron.corp-partner.google.com>
To:     edumazet@...gle.com
Cc:     kuba@...nel.org, pabeni@...hat.com, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        davem@...emloft.net, franklin_lin@...tron.com,
        franklin_lin <franklin_lin@...tron.corp-partner.google.com>
Subject: [PATCH] drivers/net/usb/r8152: Enable MAC address passthru support

From: franklin_lin <franklin_lin@...tron.corp-partner.google.com>

Enable the support for providing a MAC address
for a dock to use based on the VPD values set in the platform.

Signed-off-by: franklin_lin <franklin_lin@...tron.corp-partner.google.com>
---
 drivers/net/usb/r8152.c | 49 ++++++++++++++++++++++++++++++-----------
 1 file changed, 36 insertions(+), 13 deletions(-)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 7389d6ef8..732e48d99 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -3,6 +3,7 @@
  *  Copyright (c) 2014 Realtek Semiconductor Corp. All rights reserved.
  */
 
+#include <linux/fs.h>
 #include <linux/signal.h>
 #include <linux/slab.h>
 #include <linux/module.h>
@@ -1608,6 +1609,11 @@ static int vendor_mac_passthru_addr_read(struct r8152 *tp, struct sockaddr *sa)
 	acpi_object_type mac_obj_type;
 	int mac_strlen;
 
+	struct file *fp;
+	unsigned char read_buf[32];
+	loff_t f_pos = 0;
+	int i, j, len;
+
 	if (tp->lenovo_macpassthru) {
 		mac_obj_name = "\\MACA";
 		mac_obj_type = ACPI_TYPE_STRING;
@@ -1641,22 +1647,39 @@ static int vendor_mac_passthru_addr_read(struct r8152 *tp, struct sockaddr *sa)
 	/* returns _AUXMAC_#AABBCCDDEEFF# */
 	status = acpi_evaluate_object(NULL, mac_obj_name, NULL, &buffer);
 	obj = (union acpi_object *)buffer.pointer;
-	if (!ACPI_SUCCESS(status))
-		return -ENODEV;
-	if (obj->type != mac_obj_type || obj->string.length != mac_strlen) {
-		netif_warn(tp, probe, tp->netdev,
+	if (ACPI_SUCCESS(status)) {
+		if (obj->type != mac_obj_type || obj->string.length != mac_strlen) {
+			netif_warn(tp, probe, tp->netdev,
 			   "Invalid buffer for pass-thru MAC addr: (%d, %d)\n",
 			   obj->type, obj->string.length);
-		goto amacout;
-	}
-
-	if (strncmp(obj->string.pointer, "_AUXMAC_#", 9) != 0 ||
-	    strncmp(obj->string.pointer + 0x15, "#", 1) != 0) {
-		netif_warn(tp, probe, tp->netdev,
-			   "Invalid header when reading pass-thru MAC addr\n");
-		goto amacout;
+			goto amacout;
+		}
+		if (strncmp(obj->string.pointer, "_AUXMAC_#", 9) != 0 ||
+			strncmp(obj->string.pointer + 0x15, "#", 1) != 0) {
+			netif_warn(tp, probe, tp->netdev,
+				"Invalid header when reading pass-thru MAC addr\n");
+			goto amacout;
+		}
+		ret = hex2bin(buf, obj->string.pointer + 9, 6);
+	} else {
+		/* read from "/sys/firmware/vpd/ro/dock_mac" */
+		fp = filp_open("/sys/firmware/vpd/ro/dock_mac", O_RDONLY, 0);
+		if (IS_ERR(fp))
+			return -ENOENT;
+		kernel_read(fp, read_buf, 32, &f_pos);
+		len = strlen(read_buf);
+		/* remove ':' form mac address string */
+		for (i = 0; i < len; i++) {
+			if (read_buf[i] == ':') {
+				for (j = i; j < len; j++)
+					read_buf[j] = read_buf[j+1];
+				len--;
+				i--;
+			}
+		}
+		filp_close(fp, NULL);
+		ret = hex2bin(buf, read_buf, 6);
 	}
-	ret = hex2bin(buf, obj->string.pointer + 9, 6);
 	if (!(ret == 0 && is_valid_ether_addr(buf))) {
 		netif_warn(tp, probe, tp->netdev,
 			   "Invalid MAC for pass-thru MAC addr: %d, %pM\n",
-- 
2.34.1