kernel: 5.4: import wireguard backport

Rather than using the clunky, old, slower wireguard-linux-compat out of
tree module, this commit does a patch-by-patch backport of upstream's
wireguard to 5.4. This specific backport is in widespread use, being
part of SUSE's enterprise kernel, Oracle's enterprise kernel, Google's
Android kernel, Gentoo's distro kernel, and probably more I've forgotten
about. It's definately the "more proper" way of adding wireguard to a
kernel than the ugly compat.h hell of the wireguard-linux-compat repo.
And most importantly for OpenWRT, it allows using the same module
configuration code for 5.10 as for 5.4, with no need for bifurcation.

These patches are from the backport tree which is maintained in the
open here: https://git.zx2c4.com/wireguard-linux/log/?h=backport-5.4.y
I'll be sending PRs to update this as needed.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/080-wireguard-0065-crypto-x86-poly1305-Remove-assignments-with-no-effec.patch b/target/linux/generic/backport-5.4/080-wireguard-0065-crypto-x86-poly1305-Remove-assignments-with-no-effec.patch
new file mode 100644
index 0000000000..0f8c836da9
--- /dev/null
+++ b/target/linux/generic/backport-5.4/080-wireguard-0065-crypto-x86-poly1305-Remove-assignments-with-no-effec.patch
@@ -0,0 +1,30 @@
+From 5502c4d51b8c27631ed1026ef172bd9ce58303d2 Mon Sep 17 00:00:00 2001
+From: Herbert Xu <herbert@gondor.apana.org.au>
+Date: Thu, 24 Sep 2020 13:29:04 +1000
+Subject: [PATCH 065/124] crypto: x86/poly1305 - Remove assignments with no
+ effect
+
+commit 4a0c1de64bf9d9027a6f19adfba89fc27893db23 upstream.
+
+This patch removes a few ineffectual assignments from the function
+crypto_poly1305_setdctxkey.
+
+Reported-by: kernel test robot <lkp@intel.com>
+Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
+Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
+---
+ arch/x86/crypto/poly1305_glue.c | 3 ---
+ 1 file changed, 3 deletions(-)
+
+--- a/arch/x86/crypto/poly1305_glue.c
++++ b/arch/x86/crypto/poly1305_glue.c
+@@ -157,9 +157,6 @@ static unsigned int crypto_poly1305_setd
+ 			dctx->s[1] = get_unaligned_le32(&inp[4]);
+ 			dctx->s[2] = get_unaligned_le32(&inp[8]);
+ 			dctx->s[3] = get_unaligned_le32(&inp[12]);
+-			inp += POLY1305_BLOCK_SIZE;
+-			len -= POLY1305_BLOCK_SIZE;
+-			acc += POLY1305_BLOCK_SIZE;
+ 			dctx->sset = true;
+ 		}
+ 	}