diff --git a/target/linux/generic/backport-5.4/080-wireguard-0014-crypto-x86-poly1305-unify-Poly1305-state-struct-with.patch b/target/linux/generic/backport-5.4/080-wireguard-0014-crypto-x86-poly1305-unify-Poly1305-state-struct-with.patch
new file mode 100644
index 0000000..7d23754
--- /dev/null
+++ b/target/linux/generic/backport-5.4/080-wireguard-0014-crypto-x86-poly1305-unify-Poly1305-state-struct-with.patch
@@ -0,0 +1,251 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ard Biesheuvel <ardb@kernel.org>
+Date: Fri, 8 Nov 2019 13:22:20 +0100
+Subject: [PATCH] crypto: x86/poly1305 - unify Poly1305 state struct with
+ generic code
+
+commit ad8f5b88383ea685f2b8df2a12ee3e08089a1287 upstream.
+
+In preparation of exposing a Poly1305 library interface directly from
+the accelerated x86 driver, align the state descriptor of the x86 code
+with the one used by the generic driver. This is needed to make the
+library interface unified between all implementations.
+
+Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
+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    | 88 ++++++++++--------------------
+ crypto/poly1305_generic.c          |  6 +-
+ include/crypto/internal/poly1305.h |  4 +-
+ include/crypto/poly1305.h          | 18 +++---
+ 4 files changed, 43 insertions(+), 73 deletions(-)
+
+--- a/arch/x86/crypto/poly1305_glue.c
++++ b/arch/x86/crypto/poly1305_glue.c
+@@ -14,40 +14,14 @@
+ #include <linux/module.h>
+ #include <asm/simd.h>
+ 
+-struct poly1305_simd_desc_ctx {
+-	struct poly1305_desc_ctx base;
+-	/* derived key u set? */
+-	bool uset;
+-#ifdef CONFIG_AS_AVX2
+-	/* derived keys r^3, r^4 set? */
+-	bool wset;
+-#endif
+-	/* derived Poly1305 key r^2 */
+-	u32 u[5];
+-	/* ... silently appended r^3 and r^4 when using AVX2 */
+-};
+-
+ asmlinkage void poly1305_block_sse2(u32 *h, const u8 *src,
+ 				    const u32 *r, unsigned int blocks);
+ asmlinkage void poly1305_2block_sse2(u32 *h, const u8 *src, const u32 *r,
+ 				     unsigned int blocks, const u32 *u);
+-#ifdef CONFIG_AS_AVX2
+ asmlinkage void poly1305_4block_avx2(u32 *h, const u8 *src, const u32 *r,
+ 				     unsigned int blocks, const u32 *u);
+-static bool poly1305_use_avx2;
+-#endif
+ 
+-static int poly1305_simd_init(struct shash_desc *desc)
+-{
+-	struct poly1305_simd_desc_ctx *sctx = shash_desc_ctx(desc);
+-
+-	sctx->uset = false;
+-#ifdef CONFIG_AS_AVX2
+-	sctx->wset = false;
+-#endif
+-
+-	return crypto_poly1305_init(desc);
+-}
++static bool poly1305_use_avx2 __ro_after_init;
+ 
+ static void poly1305_simd_mult(u32 *a, const u32 *b)
+ {
+@@ -63,53 +37,49 @@ static void poly1305_simd_mult(u32 *a, c
+ static unsigned int poly1305_simd_blocks(struct poly1305_desc_ctx *dctx,
+ 					 const u8 *src, unsigned int srclen)
+ {
+-	struct poly1305_simd_desc_ctx *sctx;
+ 	unsigned int blocks, datalen;
+ 
+-	BUILD_BUG_ON(offsetof(struct poly1305_simd_desc_ctx, base));
+-	sctx = container_of(dctx, struct poly1305_simd_desc_ctx, base);
+-
+ 	if (unlikely(!dctx->sset)) {
+ 		datalen = crypto_poly1305_setdesckey(dctx, src, srclen);
+ 		src += srclen - datalen;
+ 		srclen = datalen;
+ 	}
+ 
+-#ifdef CONFIG_AS_AVX2
+-	if (poly1305_use_avx2 && srclen >= POLY1305_BLOCK_SIZE * 4) {
+-		if (unlikely(!sctx->wset)) {
+-			if (!sctx->uset) {
+-				memcpy(sctx->u, dctx->r.r, sizeof(sctx->u));
+-				poly1305_simd_mult(sctx->u, dctx->r.r);
+-				sctx->uset = true;
++	if (IS_ENABLED(CONFIG_AS_AVX2) &&
++	    poly1305_use_avx2 &&
++	    srclen >= POLY1305_BLOCK_SIZE * 4) {
++		if (unlikely(dctx->rset < 4)) {
++			if (dctx->rset < 2) {
++				dctx->r[1] = dctx->r[0];
++				poly1305_simd_mult(dctx->r[1].r, dctx->r[0].r);
+ 			}
+-			memcpy(sctx->u + 5, sctx->u, sizeof(sctx->u));
+-			poly1305_simd_mult(sctx->u + 5, dctx->r.r);
+-			memcpy(sctx->u + 10, sctx->u + 5, sizeof(sctx->u));
+-			poly1305_simd_mult(sctx->u + 10, dctx->r.r);
+-			sctx->wset = true;
++			dctx->r[2] = dctx->r[1];
++			poly1305_simd_mult(dctx->r[2].r, dctx->r[0].r);
++			dctx->r[3] = dctx->r[2];
++			poly1305_simd_mult(dctx->r[3].r, dctx->r[0].r);
++			dctx->rset = 4;
+ 		}
+ 		blocks = srclen / (POLY1305_BLOCK_SIZE * 4);
+-		poly1305_4block_avx2(dctx->h.h, src, dctx->r.r, blocks,
+-				     sctx->u);
++		poly1305_4block_avx2(dctx->h.h, src, dctx->r[0].r, blocks,
++				     dctx->r[1].r);
+ 		src += POLY1305_BLOCK_SIZE * 4 * blocks;
+ 		srclen -= POLY1305_BLOCK_SIZE * 4 * blocks;
+ 	}
+-#endif
++
+ 	if (likely(srclen >= POLY1305_BLOCK_SIZE * 2)) {
+-		if (unlikely(!sctx->uset)) {
+-			memcpy(sctx->u, dctx->r.r, sizeof(sctx->u));
+-			poly1305_simd_mult(sctx->u, dctx->r.r);
+-			sctx->uset = true;
++		if (unlikely(dctx->rset < 2)) {
++			dctx->r[1] = dctx->r[0];
++			poly1305_simd_mult(dctx->r[1].r, dctx->r[0].r);
++			dctx->rset = 2;
+ 		}
+ 		blocks = srclen / (POLY1305_BLOCK_SIZE * 2);
+-		poly1305_2block_sse2(dctx->h.h, src, dctx->r.r, blocks,
+-				     sctx->u);
++		poly1305_2block_sse2(dctx->h.h, src, dctx->r[0].r,
++				     blocks, dctx->r[1].r);
+ 		src += POLY1305_BLOCK_SIZE * 2 * blocks;
+ 		srclen -= POLY1305_BLOCK_SIZE * 2 * blocks;
+ 	}
+ 	if (srclen >= POLY1305_BLOCK_SIZE) {
+-		poly1305_block_sse2(dctx->h.h, src, dctx->r.r, 1);
++		poly1305_block_sse2(dctx->h.h, src, dctx->r[0].r, 1);
+ 		srclen -= POLY1305_BLOCK_SIZE;
+ 	}
+ 	return srclen;
+@@ -159,10 +129,10 @@ static int poly1305_simd_update(struct s
+ 
+ static struct shash_alg alg = {
+ 	.digestsize	= POLY1305_DIGEST_SIZE,
+-	.init		= poly1305_simd_init,
++	.init		= crypto_poly1305_init,
+ 	.update		= poly1305_simd_update,
+ 	.final		= crypto_poly1305_final,
+-	.descsize	= sizeof(struct poly1305_simd_desc_ctx),
++	.descsize	= sizeof(struct poly1305_desc_ctx),
+ 	.base		= {
+ 		.cra_name		= "poly1305",
+ 		.cra_driver_name	= "poly1305-simd",
+@@ -177,14 +147,14 @@ static int __init poly1305_simd_mod_init
+ 	if (!boot_cpu_has(X86_FEATURE_XMM2))
+ 		return -ENODEV;
+ 
+-#ifdef CONFIG_AS_AVX2
+-	poly1305_use_avx2 = boot_cpu_has(X86_FEATURE_AVX) &&
++	poly1305_use_avx2 = IS_ENABLED(CONFIG_AS_AVX2) &&
++			    boot_cpu_has(X86_FEATURE_AVX) &&
+ 			    boot_cpu_has(X86_FEATURE_AVX2) &&
+ 			    cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
+-	alg.descsize = sizeof(struct poly1305_simd_desc_ctx);
++	alg.descsize = sizeof(struct poly1305_desc_ctx) + 5 * sizeof(u32);
+ 	if (poly1305_use_avx2)
+ 		alg.descsize += 10 * sizeof(u32);
+-#endif
++
+ 	return crypto_register_shash(&alg);
+ }
+ 
+--- a/crypto/poly1305_generic.c
++++ b/crypto/poly1305_generic.c
+@@ -25,7 +25,7 @@ int crypto_poly1305_init(struct shash_de
+ 
+ 	poly1305_core_init(&dctx->h);
+ 	dctx->buflen = 0;
+-	dctx->rset = false;
++	dctx->rset = 0;
+ 	dctx->sset = false;
+ 
+ 	return 0;
+@@ -43,7 +43,7 @@ static void poly1305_blocks(struct poly1
+ 		srclen = datalen;
+ 	}
+ 
+-	poly1305_core_blocks(&dctx->h, &dctx->r, src,
++	poly1305_core_blocks(&dctx->h, dctx->r, src,
+ 			     srclen / POLY1305_BLOCK_SIZE, 1);
+ }
+ 
+@@ -95,7 +95,7 @@ int crypto_poly1305_final(struct shash_d
+ 		dctx->buf[dctx->buflen++] = 1;
+ 		memset(dctx->buf + dctx->buflen, 0,
+ 		       POLY1305_BLOCK_SIZE - dctx->buflen);
+-		poly1305_core_blocks(&dctx->h, &dctx->r, dctx->buf, 1, 0);
++		poly1305_core_blocks(&dctx->h, dctx->r, dctx->buf, 1, 0);
+ 	}
+ 
+ 	poly1305_core_emit(&dctx->h, digest);
+--- a/include/crypto/internal/poly1305.h
++++ b/include/crypto/internal/poly1305.h
+@@ -46,10 +46,10 @@ unsigned int crypto_poly1305_setdesckey(
+ {
+ 	if (!dctx->sset) {
+ 		if (!dctx->rset && srclen >= POLY1305_BLOCK_SIZE) {
+-			poly1305_core_setkey(&dctx->r, src);
++			poly1305_core_setkey(dctx->r, src);
+ 			src += POLY1305_BLOCK_SIZE;
+ 			srclen -= POLY1305_BLOCK_SIZE;
+-			dctx->rset = true;
++			dctx->rset = 1;
+ 		}
+ 		if (srclen >= POLY1305_BLOCK_SIZE) {
+ 			dctx->s[0] = get_unaligned_le32(src +  0);
+--- a/include/crypto/poly1305.h
++++ b/include/crypto/poly1305.h
+@@ -22,20 +22,20 @@ struct poly1305_state {
+ };
+ 
+ struct poly1305_desc_ctx {
+-	/* key */
+-	struct poly1305_key r;
+-	/* finalize key */
+-	u32 s[4];
+-	/* accumulator */
+-	struct poly1305_state h;
+ 	/* partial buffer */
+ 	u8 buf[POLY1305_BLOCK_SIZE];
+ 	/* bytes used in partial buffer */
+ 	unsigned int buflen;
+-	/* r key has been set */
+-	bool rset;
+-	/* s key has been set */
++	/* how many keys have been set in r[] */
++	unsigned short rset;
++	/* whether s[] has been set */
+ 	bool sset;
++	/* finalize key */
++	u32 s[4];
++	/* accumulator */
++	struct poly1305_state h;
++	/* key */
++	struct poly1305_key r[1];
+ };
+ 
+ #endif