crypto: hash - Count error stats differently

Move all stat code specific to hash into the hash code.

While we're at it, change the stats so that bytes and counts
are always incremented even in case of error.  This allows the
reference counting to be removed as we can now increment the
counters prior to the operation.

After the operation we simply increase the error count if necessary.
This is safe as errors can only occur synchronously (or rather,
the existing code already ignored asynchronous errors which are
only visible to the callback function).

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 36 insertions, 0 deletions

diff --git a/crypto/hash.h b/crypto/hash.h
new file mode 100644
index 000000000000..57b28a986d69
--- /dev/null
+++ b/crypto/hash.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Cryptographic API.
+ *
+ * Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+#ifndef _LOCAL_CRYPTO_HASH_H
+#define _LOCAL_CRYPTO_HASH_H
+
+#include <crypto/internal/hash.h>
+#include <linux/cryptouser.h>
+
+#include "internal.h"
+
+static inline int crypto_hash_report_stat(struct sk_buff *skb,
+					  struct crypto_alg *alg,
+					  const char *type)
+{
+	struct hash_alg_common *halg = __crypto_hash_alg_common(alg);
+	struct crypto_istat_hash *istat = hash_get_stat(halg);
+	struct crypto_stat_hash rhash;
+
+	memset(&rhash, 0, sizeof(rhash));
+
+	strscpy(rhash.type, type, sizeof(rhash.type));
+
+	rhash.stat_hash_cnt = atomic64_read(&istat->hash_cnt);
+	rhash.stat_hash_tlen = atomic64_read(&istat->hash_tlen);
+	rhash.stat_err_cnt = atomic64_read(&istat->err_cnt);
+
+	return nla_put(skb, CRYPTOCFGA_STAT_HASH, sizeof(rhash), &rhash);
+}
+
+int hash_prepare_alg(struct hash_alg_common *alg);
+
+#endif	/* _LOCAL_CRYPTO_HASH_H */