[][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-5.4/999-1782-v5.18-net-macsec-Add-missing-documentation-for-gro_cells.patch b/target/linux/mediatek/patches-5.4/999-1782-v5.18-net-macsec-Add-missing-documentation-for-gro_cells.patch
new file mode 100644
index 0000000..7d781e7
--- /dev/null
+++ b/target/linux/mediatek/patches-5.4/999-1782-v5.18-net-macsec-Add-missing-documentation-for-gro_cells.patch
@@ -0,0 +1,31 @@
+From ecdc5689d93eab429f7a48ae058b7c516a4a3c95 Mon Sep 17 00:00:00 2001
+From: Lee Jones <lee.jones@linaro.org>
+Date: Mon, 2 Nov 2020 11:45:07 +0000
+Subject: net: macsec: Add missing documentation for 'gro_cells'
+
+Fixes the following W=1 kernel build warning(s):
+
+ drivers/net/macsec.c:113: warning: Function parameter or member 'gro_cells' not described in 'macsec_dev'
+
+Signed-off-by: Lee Jones <lee.jones@linaro.org>
+Link: https://lore.kernel.org/r/20201102114512.1062724-26-lee.jones@linaro.org
+Signed-off-by: Jakub Kicinski <kuba@kernel.org>
+---
+ drivers/net/macsec.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
+index 11ca5fa902a16..92425e1fd70c0 100644
+--- a/drivers/net/macsec.c
++++ b/drivers/net/macsec.c
+@@ -101,6 +101,7 @@ struct pcpu_secy_stats {
+  * @real_dev: pointer to underlying netdevice
+  * @stats: MACsec device stats
+  * @secys: linked list of SecY's on the underlying device
++ * @gro_cells: pointer to the Generic Receive Offload cell
+  * @offload: status of offloading on the MACsec device
+  */
+ struct macsec_dev {
+-- 
+cgit 1.2.3-1.el7
+