From: ard.biesheuvel@linaro.org (Ard Biesheuvel)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 6/9] crypto: crc-t10dif/arm - move PMULL based code into core library
Date: Fri, 5 Oct 2018 10:13:30 +0200 [thread overview]
Message-ID: <20181005081333.15018-7-ard.biesheuvel@linaro.org> (raw)
In-Reply-To: <20181005081333.15018-1-ard.biesheuvel@linaro.org>
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/arm/crypto/crct10dif-ce-glue.c | 78 ++++++--------------
1 file changed, 22 insertions(+), 56 deletions(-)
diff --git a/arch/arm/crypto/crct10dif-ce-glue.c b/arch/arm/crypto/crct10dif-ce-glue.c
index d428355cf38d..2020d9c29ff1 100644
--- a/arch/arm/crypto/crct10dif-ce-glue.c
+++ b/arch/arm/crypto/crct10dif-ce-glue.c
@@ -10,12 +10,11 @@
#include <linux/crc-t10dif.h>
#include <linux/init.h>
+#include <linux/ffp.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
-#include <crypto/internal/hash.h>
-
#include <asm/neon.h>
#include <asm/simd.h>
@@ -23,74 +22,42 @@
asmlinkage u16 crc_t10dif_pmull(u16 init_crc, const u8 buf[], u32 len);
-static int crct10dif_init(struct shash_desc *desc)
+static __u16 crct10dif_update_arm(__u16 crc, const u8 *data, unsigned int length)
{
- u16 *crc = shash_desc_ctx(desc);
-
- *crc = 0;
- return 0;
-}
-
-static int crct10dif_update(struct shash_desc *desc, const u8 *data,
- unsigned int length)
-{
- u16 *crc = shash_desc_ctx(desc);
unsigned int l;
- if (!may_use_simd()) {
- *crc = crc_t10dif_generic(*crc, data, length);
- } else {
- if (unlikely((u32)data % CRC_T10DIF_PMULL_CHUNK_SIZE)) {
- l = min_t(u32, length, CRC_T10DIF_PMULL_CHUNK_SIZE -
- ((u32)data % CRC_T10DIF_PMULL_CHUNK_SIZE));
+ if (!may_use_simd())
+ return crc_t10dif_generic(crc, data, length);
- *crc = crc_t10dif_generic(*crc, data, l);
+ if (unlikely((u32)data % CRC_T10DIF_PMULL_CHUNK_SIZE)) {
+ l = min_t(u32, length, CRC_T10DIF_PMULL_CHUNK_SIZE -
+ ((u32)data % CRC_T10DIF_PMULL_CHUNK_SIZE));
- length -= l;
- data += l;
- }
- if (length > 0) {
- kernel_neon_begin();
- *crc = crc_t10dif_pmull(*crc, data, length);
- kernel_neon_end();
- }
- }
- return 0;
-}
+ crc = crc_t10dif_generic(crc, data, l);
-static int crct10dif_final(struct shash_desc *desc, u8 *out)
-{
- u16 *crc = shash_desc_ctx(desc);
-
- *(u16 *)out = *crc;
- return 0;
+ length -= l;
+ data += l;
+ }
+ if (length > 0) {
+ kernel_neon_begin();
+ crc = crc_t10dif_pmull(crc, data, length);
+ kernel_neon_end();
+ }
+ return crc;
}
-static struct shash_alg crc_t10dif_alg = {
- .digestsize = CRC_T10DIF_DIGEST_SIZE,
- .init = crct10dif_init,
- .update = crct10dif_update,
- .final = crct10dif_final,
- .descsize = CRC_T10DIF_DIGEST_SIZE,
-
- .base.cra_name = "crct10dif",
- .base.cra_driver_name = "crct10dif-arm-ce",
- .base.cra_priority = 200,
- .base.cra_blocksize = CRC_T10DIF_BLOCK_SIZE,
- .base.cra_module = THIS_MODULE,
-};
-
static int __init crc_t10dif_mod_init(void)
{
- if (!(elf_hwcap2 & HWCAP2_PMULL))
- return -ENODEV;
+ SET_FFP(crc_t10dif_update_arch, crct10dif_update_arm);
- return crypto_register_shash(&crc_t10dif_alg);
+ return 0;
}
static void __exit crc_t10dif_mod_exit(void)
{
- crypto_unregister_shash(&crc_t10dif_alg);
+ RESET_FFP(crc_t10dif_update_arch);
+ /* wait for all users to switch back to the old version */
+ synchronize_rcu();
}
module_init(crc_t10dif_mod_init);
@@ -98,4 +65,3 @@ module_exit(crc_t10dif_mod_exit);
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");
-MODULE_ALIAS_CRYPTO("crct10dif");
--
2.11.0
next prev parent reply other threads:[~2018-10-05 8:13 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-05 8:13 [RFC PATCH 0/9] patchable function pointers for pluggable crypto routines Ard Biesheuvel
2018-10-05 8:13 ` [RFC PATCH 1/9] kernel: add support for patchable function pointers Ard Biesheuvel
2018-10-05 13:57 ` Peter Zijlstra
2018-10-05 14:03 ` Ard Biesheuvel
2018-10-05 14:14 ` Peter Zijlstra
2018-10-05 14:57 ` Ard Biesheuvel
2018-10-05 15:08 ` Andy Lutomirski
2018-10-05 15:24 ` Ard Biesheuvel
2018-10-05 16:58 ` Andy Lutomirski
2018-10-05 17:11 ` Ard Biesheuvel
2018-10-05 17:20 ` Andy Lutomirski
2018-10-05 17:23 ` Ard Biesheuvel
2018-10-05 17:28 ` Andy Lutomirski
2018-10-05 17:37 ` Jason A. Donenfeld
2018-10-05 17:44 ` Andy Lutomirski
2018-10-05 18:28 ` Jason A. Donenfeld
2018-10-05 19:13 ` Ard Biesheuvel
2018-10-05 8:13 ` [RFC PATCH 2/9] arm64: kernel: add arch " Ard Biesheuvel
2018-10-05 8:13 ` [RFC PATCH 3/9] crypto: crc-t10dif - make crc_t10dif a static inline Ard Biesheuvel
2018-10-05 8:13 ` [RFC PATCH 4/9] crypto: crc-t10dif - use patchable function pointer for core update routine Ard Biesheuvel
2018-10-05 8:13 ` [RFC PATCH 5/9] crypto: crc-t10dif/arm64 - move PMULL based code into core library Ard Biesheuvel
2018-10-05 8:13 ` Ard Biesheuvel [this message]
2018-10-05 8:13 ` [RFC PATCH 7/9] crypto: crct10dif/generic - switch crypto API driver to " Ard Biesheuvel
2018-10-05 8:13 ` [RFC PATCH 8/9] crypto: crc-t10dif/powerpc - move PMULL based code into " Ard Biesheuvel
2018-10-05 8:13 ` [RFC PATCH 9/9] crypto: crc-t10dif/x86 " Ard Biesheuvel
2018-10-05 13:37 ` [RFC PATCH 0/9] patchable function pointers for pluggable crypto routines Jason A. Donenfeld
2018-10-05 17:15 ` Ard Biesheuvel
2018-10-05 17:26 ` Andy Lutomirski
2018-10-05 17:28 ` Ard Biesheuvel
2018-10-05 18:00 ` Andy Lutomirski
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