[][Add macsec HW offload backport from kernel 5.18]

[Description]
Add macsec HW offload backport from kernel 5.18.

[Release-log]
N/A

Change-Id: I5b143fe620ec4bcae4075d1d85db5e41c8d48717
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5981730
diff --git a/target/linux/mediatek/patches-5.4/999-1754-04-v5.18-net-phy-add-MACsec-ops-in-phy_device.patch b/target/linux/mediatek/patches-5.4/999-1754-04-v5.18-net-phy-add-MACsec-ops-in-phy_device.patch
new file mode 100644
index 0000000..dff64b3
--- /dev/null
+++ b/target/linux/mediatek/patches-5.4/999-1754-04-v5.18-net-phy-add-MACsec-ops-in-phy_device.patch
@@ -0,0 +1,50 @@
+From 2e18135845b359f26c37df38ba56565496517c10 Mon Sep 17 00:00:00 2001
+From: Antoine Tenart <antoine.tenart@bootlin.com>
+Date: Mon, 13 Jan 2020 23:31:42 +0100
+Subject: net: phy: add MACsec ops in phy_device
+
+This patch adds a reference to MACsec ops in the phy_device, to allow
+PHYs to support offloading MACsec operations. The phydev lock will be
+held while calling those helpers.
+
+Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ include/linux/phy.h | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/include/linux/phy.h b/include/linux/phy.h
+index be079a7bb40aa..2929d0bc307fe 100644
+--- a/include/linux/phy.h
++++ b/include/linux/phy.h
+@@ -333,6 +333,7 @@ struct phy_c45_device_ids {
+ };
+ 
+ struct macsec_context;
++struct macsec_ops;
+ 
+ /* phy_device: An instance of a PHY
+  *
+@@ -356,6 +357,7 @@ struct macsec_context;
+  * attached_dev: The attached enet driver's device instance ptr
+  * adjust_link: Callback for the enet controller to respond to
+  * changes in the link state.
++ * macsec_ops: MACsec offloading ops.
+  *
+  * speed, duplex, pause, supported, advertising, lp_advertising,
+  * and autoneg are used like in mii_if_info
+@@ -455,6 +457,11 @@ struct phy_device {
+ 
+ 	void (*phy_link_change)(struct phy_device *, bool up, bool do_carrier);
+ 	void (*adjust_link)(struct net_device *dev);
++
++#if IS_ENABLED(CONFIG_MACSEC)
++	/* MACsec management functions */
++	const struct macsec_ops *macsec_ops;
++#endif
+ };
+ #define to_phy_device(d) container_of(to_mdio_device(d), \
+ 				      struct phy_device, mdio)
+-- 
+cgit 1.2.3-1.el7
+