From 4cfe56040171e791b021d5490f8fd58c55b088fb Mon Sep 17 00:00:00 2001
From: Ke Zhang <ke1x.zhang@intel.com>
Date: Wed, 8 Jun 2022 15:11:17 +0300
Subject: [PATCH] kni: use dedicated function to set MAC address
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[ upstream commit b99bd4a0aacab47165d045a6aeee88ee74744600 ]

The warning info:
warning: passing argument 1 of ‘memcpy’ discards ‘const’
qualifier from pointer target type

Variable dev_addr is done const intentionally in v5.17 to prevent using
it directly.  See the following Linux kernel changeset for details:

commit adeef3e32146 ("net: constify netdev->dev_addr")

Used helper function was introduced earlier in v5.15.

Fixes: ea6b39b5b847 ("kni: remove ethtool support")

Signed-off-by: Ke Zhang <ke1x.zhang@intel.com>
Signed-off-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Acked-by: Ferruh Yigit <ferruh.yigit@xilinx.com>
---
 kernel/linux/kni/compat.h   | 4 ++++
 kernel/linux/kni/kni_misc.c | 9 +++++++--
 kernel/linux/kni/kni_net.c  | 4 ++++
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/kernel/linux/kni/compat.h b/kernel/linux/kni/compat.h
index 0db29a4a6f..3a86d12bbc 100644
--- a/kernel/linux/kni/compat.h
+++ b/kernel/linux/kni/compat.h
@@ -142,6 +142,10 @@
 #define HAVE_TSK_IN_GUP
 #endif
 
+#if KERNEL_VERSION(5, 15, 0) <= LINUX_VERSION_CODE
+#define HAVE_ETH_HW_ADDR_SET
+#endif
+
 #if KERNEL_VERSION(5, 18, 0) > LINUX_VERSION_CODE
 #define HAVE_NETIF_RX_NI
 #endif
diff --git a/kernel/linux/kni/kni_misc.c b/kernel/linux/kni/kni_misc.c
index 38fcd7f4f2..feed12b568 100644
--- a/kernel/linux/kni/kni_misc.c
+++ b/kernel/linux/kni/kni_misc.c
@@ -404,11 +404,16 @@ kni_ioctl_create(struct net *net, uint32_t ioctl_num,
 	pr_debug("mbuf_size:    %u\n", kni->mbuf_size);
 
 	/* if user has provided a valid mac address */
-	if (is_valid_ether_addr(dev_info.mac_addr))
+	if (is_valid_ether_addr(dev_info.mac_addr)) {
+#ifdef HAVE_ETH_HW_ADDR_SET
+		eth_hw_addr_set(net_dev, dev_info.mac_addr);
+#else
 		memcpy(net_dev->dev_addr, dev_info.mac_addr, ETH_ALEN);
-	else
+#endif
+	} else {
 		/* Assign random MAC address. */
 		eth_hw_addr_random(net_dev);
+	}
 
 	if (dev_info.mtu)
 		net_dev->mtu = dev_info.mtu;
diff --git a/kernel/linux/kni/kni_net.c b/kernel/linux/kni/kni_net.c
index 41805fcabf..779ee3451a 100644
--- a/kernel/linux/kni/kni_net.c
+++ b/kernel/linux/kni/kni_net.c
@@ -783,7 +783,11 @@ kni_net_set_mac(struct net_device *netdev, void *p)
 		return -EADDRNOTAVAIL;
 
 	memcpy(req.mac_addr, addr->sa_data, netdev->addr_len);
+#ifdef HAVE_ETH_HW_ADDR_SET
+	eth_hw_addr_set(netdev, addr->sa_data);
+#else
 	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
+#endif
 
 	ret = kni_net_process_request(netdev, &req);
 
-- 
2.23.0