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Subject[RFC PATCH 9/9] crypto: crc-t10dif/x86 - move PMULL based code into core library
Date
Move the PMULL based routines out of the crypto API into the core
CRC-T10DIF library.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
arch/x86/crypto/crct10dif-pclmul_glue.c | 98 +++-----------------
1 file changed, 13 insertions(+), 85 deletions(-)

diff --git a/arch/x86/crypto/crct10dif-pclmul_glue.c b/arch/x86/crypto/crct10dif-pclmul_glue.c
index cd4df9322501..47f0017ad7f3 100644
--- a/arch/x86/crypto/crct10dif-pclmul_glue.c
+++ b/arch/x86/crypto/crct10dif-pclmul_glue.c
@@ -25,7 +25,7 @@
#include <linux/types.h>
#include <linux/module.h>
#include <linux/crc-t10dif.h>
-#include <crypto/internal/hash.h>
+#include <linux/ffp.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/kernel.h>
@@ -36,90 +36,17 @@
asmlinkage __u16 crc_t10dif_pcl(__u16 crc, const unsigned char *buf,
size_t len);

-struct chksum_desc_ctx {
- __u16 crc;
-};
-
-/*
- * Steps through buffer one byte at at time, calculates reflected
- * crc using table.
- */
-
-static int chksum_init(struct shash_desc *desc)
-{
- struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
-
- ctx->crc = 0;
-
- return 0;
-}
-
-static int chksum_update(struct shash_desc *desc, const u8 *data,
- unsigned int length)
-{
- struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
-
- if (irq_fpu_usable()) {
- kernel_fpu_begin();
- ctx->crc = crc_t10dif_pcl(ctx->crc, data, length);
- kernel_fpu_end();
- } else
- ctx->crc = crc_t10dif_generic(ctx->crc, data, length);
- return 0;
-}
-
-static int chksum_final(struct shash_desc *desc, u8 *out)
-{
- struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
-
- *(__u16 *)out = ctx->crc;
- return 0;
-}
-
-static int __chksum_finup(__u16 *crcp, const u8 *data, unsigned int len,
- u8 *out)
+static __u16 crct10dif_update_x86(__u16 crc, const u8 *data, unsigned int length)
{
if (irq_fpu_usable()) {
kernel_fpu_begin();
- *(__u16 *)out = crc_t10dif_pcl(*crcp, data, len);
+ crc = crc_t10dif_pcl(crc, data, length);
kernel_fpu_end();
- } else
- *(__u16 *)out = crc_t10dif_generic(*crcp, data, len);
- return 0;
-}
-
-static int chksum_finup(struct shash_desc *desc, const u8 *data,
- unsigned int len, u8 *out)
-{
- struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
-
- return __chksum_finup(&ctx->crc, data, len, out);
-}
-
-static int chksum_digest(struct shash_desc *desc, const u8 *data,
- unsigned int length, u8 *out)
-{
- struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
-
- return __chksum_finup(&ctx->crc, data, length, out);
-}
-
-static struct shash_alg alg = {
- .digestsize = CRC_T10DIF_DIGEST_SIZE,
- .init = chksum_init,
- .update = chksum_update,
- .final = chksum_final,
- .finup = chksum_finup,
- .digest = chksum_digest,
- .descsize = sizeof(struct chksum_desc_ctx),
- .base = {
- .cra_name = "crct10dif",
- .cra_driver_name = "crct10dif-pclmul",
- .cra_priority = 200,
- .cra_blocksize = CRC_T10DIF_BLOCK_SIZE,
- .cra_module = THIS_MODULE,
+ } else {
+ crc = crc_t10dif_generic(crc, data, length);
}
-};
+ return crc;
+}

static const struct x86_cpu_id crct10dif_cpu_id[] = {
X86_FEATURE_MATCH(X86_FEATURE_PCLMULQDQ),
@@ -132,12 +59,16 @@ static int __init crct10dif_intel_mod_init(void)
if (!x86_match_cpu(crct10dif_cpu_id))
return -ENODEV;

- return crypto_register_shash(&alg);
+ SET_FFP(crc_t10dif_update_arch, crct10dif_update_x86);
+
+ return 0;
}

static void __exit crct10dif_intel_mod_fini(void)
{
- crypto_unregister_shash(&alg);
+ RESET_FFP(crc_t10dif_update_arch);
+ /* wait for all users to switch back to the old version */
+ synchronize_rcu();
}

module_init(crct10dif_intel_mod_init);
@@ -146,6 +77,3 @@ module_exit(crct10dif_intel_mod_fini);
MODULE_AUTHOR("Tim Chen <tim.c.chen@linux.intel.com>");
MODULE_DESCRIPTION("T10 DIF CRC calculation accelerated with PCLMULQDQ.");
MODULE_LICENSE("GPL");
-
-MODULE_ALIAS_CRYPTO("crct10dif");
-MODULE_ALIAS_CRYPTO("crct10dif-pclmul");
--
2.11.0
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