linux-kernel - [PATCH v2 6/8] crypto: x86/ghash - add kernel-doc comments to assembly

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Date:   Mon, 19 Dec 2022 12:55:53 -0600
From:   Robert Elliott <elliott@....com>
To:     herbert@...dor.apana.org.au, davem@...emloft.net, corbet@....net,
        linux-crypto@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Robert Elliott <elliott@....com>
Subject: [PATCH v2 6/8] crypto: x86/ghash - add kernel-doc comments to assembly

Add kernel-doc comments for assembly language functions exported to
C glue code.

Signed-off-by: Robert Elliott <elliott@....com>
---
 arch/x86/crypto/ghash-clmulni-intel_asm.S | 27 +++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/arch/x86/crypto/ghash-clmulni-intel_asm.S b/arch/x86/crypto/ghash-clmulni-intel_asm.S
index 2bf871899920..09cf9271b83a 100644
--- a/arch/x86/crypto/ghash-clmulni-intel_asm.S
+++ b/arch/x86/crypto/ghash-clmulni-intel_asm.S
@@ -88,7 +88,16 @@ SYM_FUNC_START_LOCAL(__clmul_gf128mul_ble)
 	RET
 SYM_FUNC_END(__clmul_gf128mul_ble)
 
-/* void clmul_ghash_mul(char *dst, const u128 *shash) */
+/**
+ * clmul_ghash_mul - Calculate GHASH final multiplication using x86 PCLMULQDQ instructions
+ * @dst:	address of hash value to update (%rdi)
+ * @shash:	address of hash context (%rsi)
+ *
+ * This supports 64-bit CPUs.
+ *
+ * Return:	none (but @dst is updated)
+ * Prototype:	asmlinkage void clmul_ghash_mul(char *dst, const u128 *shash)
+ */
 SYM_FUNC_START(clmul_ghash_mul)
 	FRAME_BEGIN
 	movups (%rdi), DATA
@@ -102,9 +111,19 @@ SYM_FUNC_START(clmul_ghash_mul)
 	RET
 SYM_FUNC_END(clmul_ghash_mul)
 
-/*
- * void clmul_ghash_update(char *dst, const char *src, unsigned int srclen,
- *			   const u128 *shash);
+/**
+ * clmul_ghash_update - Calculate GHASH using x86 PCLMULQDQ instructions
+ * @dst:	address of hash value to update (%rdi)
+ * @src:	address of data to hash (%rsi)
+ * @srclen:	number of bytes in data buffer (%rdx);
+ *		function does nothing and returns if below 16
+ * @shash:	address of hash context (%rcx)
+ *
+ * This supports 64-bit CPUs.
+ *
+ * Return:	none (but @dst is updated)
+ * Prototype:	asmlinkage clmul_ghash_update(char *dst, const char *src,
+ *					      unsigned int srclen, const u128 *shash);
  */
 SYM_FUNC_START(clmul_ghash_update)
 	FRAME_BEGIN
-- 
2.38.1