[PATCH v4 4/9] crypto: zstd: Switch to zstd-1.4.6 API

[Nick Terrell <nickrterrell@gmail.com>]

From: Nick Terrell <terrelln@fb.com>

Move away from the compatibility wrapper to the zstd-1.4.6 API. This
code is functionally equivalent.

Signed-off-by: Nick Terrell <terrelln@fb.com>
---
 crypto/zstd.c | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/crypto/zstd.c b/crypto/zstd.c
index dcda3cad3b5c..767fe2fbe009 100644
--- a/crypto/zstd.c
+++ b/crypto/zstd.c
@@ -11,7 +11,7 @@
 #include <linux/module.h>
 #include <linux/net.h>
 #include <linux/vmalloc.h>
-#include <linux/zstd_compat.h>
+#include <linux/zstd.h>
 #include <crypto/internal/scompress.h>
 
 
@@ -24,16 +24,15 @@ struct zstd_ctx {
 	void *dwksp;
 };
 
-static ZSTD_parameters zstd_params(void)
-{
-	return ZSTD_getParams(ZSTD_DEF_LEVEL, 0, 0);
-}
-
 static int zstd_comp_init(struct zstd_ctx *ctx)
 {
 	int ret = 0;
-	const ZSTD_parameters params = zstd_params();
-	const size_t wksp_size = ZSTD_CCtxWorkspaceBound(params.cParams);
+	const size_t wksp_size = ZSTD_estimateCCtxSize(ZSTD_DEF_LEVEL);
+
+	if (ZSTD_isError(wksp_size)) {
+		ret = -EINVAL;
+		goto out_free;
+	}
 
 	ctx->cwksp = vzalloc(wksp_size);
 	if (!ctx->cwksp) {
@@ -41,7 +40,7 @@ static int zstd_comp_init(struct zstd_ctx *ctx)
 		goto out;
 	}
 
-	ctx->cctx = ZSTD_initCCtx(ctx->cwksp, wksp_size);
+	ctx->cctx = ZSTD_initStaticCCtx(ctx->cwksp, wksp_size);
 	if (!ctx->cctx) {
 		ret = -EINVAL;
 		goto out_free;
@@ -56,7 +55,7 @@ static int zstd_comp_init(struct zstd_ctx *ctx)
 static int zstd_decomp_init(struct zstd_ctx *ctx)
 {
 	int ret = 0;
-	const size_t wksp_size = ZSTD_DCtxWorkspaceBound();
+	const size_t wksp_size = ZSTD_estimateDCtxSize();
 
 	ctx->dwksp = vzalloc(wksp_size);
 	if (!ctx->dwksp) {
@@ -64,7 +63,7 @@ static int zstd_decomp_init(struct zstd_ctx *ctx)
 		goto out;
 	}
 
-	ctx->dctx = ZSTD_initDCtx(ctx->dwksp, wksp_size);
+	ctx->dctx = ZSTD_initStaticDCtx(ctx->dwksp, wksp_size);
 	if (!ctx->dctx) {
 		ret = -EINVAL;
 		goto out_free;
@@ -152,9 +151,8 @@ static int __zstd_compress(const u8 *src, unsigned int slen,
 {
 	size_t out_len;
 	struct zstd_ctx *zctx = ctx;
-	const ZSTD_parameters params = zstd_params();
 
-	out_len = ZSTD_compressCCtx(zctx->cctx, dst, *dlen, src, slen, params);
+	out_len = ZSTD_compressCCtx(zctx->cctx, dst, *dlen, src, slen, ZSTD_DEF_LEVEL);
 	if (ZSTD_isError(out_len))
 		return -EINVAL;
 	*dlen = out_len;
-- 
2.28.0