forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
310 lines
8.2 KiB
310 lines
8.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* Crypto-API module for CRC-32 algorithms implemented with the |
|
* z/Architecture Vector Extension Facility. |
|
* |
|
* Copyright IBM Corp. 2015 |
|
* Author(s): Hendrik Brueckner <[email protected]> |
|
*/ |
|
#define KMSG_COMPONENT "crc32-vx" |
|
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
|
|
|
#include <linux/module.h> |
|
#include <linux/cpufeature.h> |
|
#include <linux/crc32.h> |
|
#include <crypto/internal/hash.h> |
|
#include <asm/fpu/api.h> |
|
|
|
|
|
#define CRC32_BLOCK_SIZE 1 |
|
#define CRC32_DIGEST_SIZE 4 |
|
|
|
#define VX_MIN_LEN 64 |
|
#define VX_ALIGNMENT 16L |
|
#define VX_ALIGN_MASK (VX_ALIGNMENT - 1) |
|
|
|
struct crc_ctx { |
|
u32 key; |
|
}; |
|
|
|
struct crc_desc_ctx { |
|
u32 crc; |
|
}; |
|
|
|
/* Prototypes for functions in assembly files */ |
|
u32 crc32_le_vgfm_16(u32 crc, unsigned char const *buf, size_t size); |
|
u32 crc32_be_vgfm_16(u32 crc, unsigned char const *buf, size_t size); |
|
u32 crc32c_le_vgfm_16(u32 crc, unsigned char const *buf, size_t size); |
|
|
|
/* |
|
* DEFINE_CRC32_VX() - Define a CRC-32 function using the vector extension |
|
* |
|
* Creates a function to perform a particular CRC-32 computation. Depending |
|
* on the message buffer, the hardware-accelerated or software implementation |
|
* is used. Note that the message buffer is aligned to improve fetch |
|
* operations of VECTOR LOAD MULTIPLE instructions. |
|
* |
|
*/ |
|
#define DEFINE_CRC32_VX(___fname, ___crc32_vx, ___crc32_sw) \ |
|
static u32 __pure ___fname(u32 crc, \ |
|
unsigned char const *data, size_t datalen) \ |
|
{ \ |
|
struct kernel_fpu vxstate; \ |
|
unsigned long prealign, aligned, remaining; \ |
|
\ |
|
if (datalen < VX_MIN_LEN + VX_ALIGN_MASK) \ |
|
return ___crc32_sw(crc, data, datalen); \ |
|
\ |
|
if ((unsigned long)data & VX_ALIGN_MASK) { \ |
|
prealign = VX_ALIGNMENT - \ |
|
((unsigned long)data & VX_ALIGN_MASK); \ |
|
datalen -= prealign; \ |
|
crc = ___crc32_sw(crc, data, prealign); \ |
|
data = (void *)((unsigned long)data + prealign); \ |
|
} \ |
|
\ |
|
aligned = datalen & ~VX_ALIGN_MASK; \ |
|
remaining = datalen & VX_ALIGN_MASK; \ |
|
\ |
|
kernel_fpu_begin(&vxstate, KERNEL_VXR_LOW); \ |
|
crc = ___crc32_vx(crc, data, aligned); \ |
|
kernel_fpu_end(&vxstate, KERNEL_VXR_LOW); \ |
|
\ |
|
if (remaining) \ |
|
crc = ___crc32_sw(crc, data + aligned, remaining); \ |
|
\ |
|
return crc; \ |
|
} |
|
|
|
DEFINE_CRC32_VX(crc32_le_vx, crc32_le_vgfm_16, crc32_le) |
|
DEFINE_CRC32_VX(crc32_be_vx, crc32_be_vgfm_16, crc32_be) |
|
DEFINE_CRC32_VX(crc32c_le_vx, crc32c_le_vgfm_16, __crc32c_le) |
|
|
|
|
|
static int crc32_vx_cra_init_zero(struct crypto_tfm *tfm) |
|
{ |
|
struct crc_ctx *mctx = crypto_tfm_ctx(tfm); |
|
|
|
mctx->key = 0; |
|
return 0; |
|
} |
|
|
|
static int crc32_vx_cra_init_invert(struct crypto_tfm *tfm) |
|
{ |
|
struct crc_ctx *mctx = crypto_tfm_ctx(tfm); |
|
|
|
mctx->key = ~0; |
|
return 0; |
|
} |
|
|
|
static int crc32_vx_init(struct shash_desc *desc) |
|
{ |
|
struct crc_ctx *mctx = crypto_shash_ctx(desc->tfm); |
|
struct crc_desc_ctx *ctx = shash_desc_ctx(desc); |
|
|
|
ctx->crc = mctx->key; |
|
return 0; |
|
} |
|
|
|
static int crc32_vx_setkey(struct crypto_shash *tfm, const u8 *newkey, |
|
unsigned int newkeylen) |
|
{ |
|
struct crc_ctx *mctx = crypto_shash_ctx(tfm); |
|
|
|
if (newkeylen != sizeof(mctx->key)) |
|
return -EINVAL; |
|
mctx->key = le32_to_cpu(*(__le32 *)newkey); |
|
return 0; |
|
} |
|
|
|
static int crc32be_vx_setkey(struct crypto_shash *tfm, const u8 *newkey, |
|
unsigned int newkeylen) |
|
{ |
|
struct crc_ctx *mctx = crypto_shash_ctx(tfm); |
|
|
|
if (newkeylen != sizeof(mctx->key)) |
|
return -EINVAL; |
|
mctx->key = be32_to_cpu(*(__be32 *)newkey); |
|
return 0; |
|
} |
|
|
|
static int crc32le_vx_final(struct shash_desc *desc, u8 *out) |
|
{ |
|
struct crc_desc_ctx *ctx = shash_desc_ctx(desc); |
|
|
|
*(__le32 *)out = cpu_to_le32p(&ctx->crc); |
|
return 0; |
|
} |
|
|
|
static int crc32be_vx_final(struct shash_desc *desc, u8 *out) |
|
{ |
|
struct crc_desc_ctx *ctx = shash_desc_ctx(desc); |
|
|
|
*(__be32 *)out = cpu_to_be32p(&ctx->crc); |
|
return 0; |
|
} |
|
|
|
static int crc32c_vx_final(struct shash_desc *desc, u8 *out) |
|
{ |
|
struct crc_desc_ctx *ctx = shash_desc_ctx(desc); |
|
|
|
/* |
|
* Perform a final XOR with 0xFFFFFFFF to be in sync |
|
* with the generic crc32c shash implementation. |
|
*/ |
|
*(__le32 *)out = ~cpu_to_le32p(&ctx->crc); |
|
return 0; |
|
} |
|
|
|
static int __crc32le_vx_finup(u32 *crc, const u8 *data, unsigned int len, |
|
u8 *out) |
|
{ |
|
*(__le32 *)out = cpu_to_le32(crc32_le_vx(*crc, data, len)); |
|
return 0; |
|
} |
|
|
|
static int __crc32be_vx_finup(u32 *crc, const u8 *data, unsigned int len, |
|
u8 *out) |
|
{ |
|
*(__be32 *)out = cpu_to_be32(crc32_be_vx(*crc, data, len)); |
|
return 0; |
|
} |
|
|
|
static int __crc32c_vx_finup(u32 *crc, const u8 *data, unsigned int len, |
|
u8 *out) |
|
{ |
|
/* |
|
* Perform a final XOR with 0xFFFFFFFF to be in sync |
|
* with the generic crc32c shash implementation. |
|
*/ |
|
*(__le32 *)out = ~cpu_to_le32(crc32c_le_vx(*crc, data, len)); |
|
return 0; |
|
} |
|
|
|
|
|
#define CRC32_VX_FINUP(alg, func) \ |
|
static int alg ## _vx_finup(struct shash_desc *desc, const u8 *data, \ |
|
unsigned int datalen, u8 *out) \ |
|
{ \ |
|
return __ ## alg ## _vx_finup(shash_desc_ctx(desc), \ |
|
data, datalen, out); \ |
|
} |
|
|
|
CRC32_VX_FINUP(crc32le, crc32_le_vx) |
|
CRC32_VX_FINUP(crc32be, crc32_be_vx) |
|
CRC32_VX_FINUP(crc32c, crc32c_le_vx) |
|
|
|
#define CRC32_VX_DIGEST(alg, func) \ |
|
static int alg ## _vx_digest(struct shash_desc *desc, const u8 *data, \ |
|
unsigned int len, u8 *out) \ |
|
{ \ |
|
return __ ## alg ## _vx_finup(crypto_shash_ctx(desc->tfm), \ |
|
data, len, out); \ |
|
} |
|
|
|
CRC32_VX_DIGEST(crc32le, crc32_le_vx) |
|
CRC32_VX_DIGEST(crc32be, crc32_be_vx) |
|
CRC32_VX_DIGEST(crc32c, crc32c_le_vx) |
|
|
|
#define CRC32_VX_UPDATE(alg, func) \ |
|
static int alg ## _vx_update(struct shash_desc *desc, const u8 *data, \ |
|
unsigned int datalen) \ |
|
{ \ |
|
struct crc_desc_ctx *ctx = shash_desc_ctx(desc); \ |
|
ctx->crc = func(ctx->crc, data, datalen); \ |
|
return 0; \ |
|
} |
|
|
|
CRC32_VX_UPDATE(crc32le, crc32_le_vx) |
|
CRC32_VX_UPDATE(crc32be, crc32_be_vx) |
|
CRC32_VX_UPDATE(crc32c, crc32c_le_vx) |
|
|
|
|
|
static struct shash_alg crc32_vx_algs[] = { |
|
/* CRC-32 LE */ |
|
{ |
|
.init = crc32_vx_init, |
|
.setkey = crc32_vx_setkey, |
|
.update = crc32le_vx_update, |
|
.final = crc32le_vx_final, |
|
.finup = crc32le_vx_finup, |
|
.digest = crc32le_vx_digest, |
|
.descsize = sizeof(struct crc_desc_ctx), |
|
.digestsize = CRC32_DIGEST_SIZE, |
|
.base = { |
|
.cra_name = "crc32", |
|
.cra_driver_name = "crc32-vx", |
|
.cra_priority = 200, |
|
.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, |
|
.cra_blocksize = CRC32_BLOCK_SIZE, |
|
.cra_ctxsize = sizeof(struct crc_ctx), |
|
.cra_module = THIS_MODULE, |
|
.cra_init = crc32_vx_cra_init_zero, |
|
}, |
|
}, |
|
/* CRC-32 BE */ |
|
{ |
|
.init = crc32_vx_init, |
|
.setkey = crc32be_vx_setkey, |
|
.update = crc32be_vx_update, |
|
.final = crc32be_vx_final, |
|
.finup = crc32be_vx_finup, |
|
.digest = crc32be_vx_digest, |
|
.descsize = sizeof(struct crc_desc_ctx), |
|
.digestsize = CRC32_DIGEST_SIZE, |
|
.base = { |
|
.cra_name = "crc32be", |
|
.cra_driver_name = "crc32be-vx", |
|
.cra_priority = 200, |
|
.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, |
|
.cra_blocksize = CRC32_BLOCK_SIZE, |
|
.cra_ctxsize = sizeof(struct crc_ctx), |
|
.cra_module = THIS_MODULE, |
|
.cra_init = crc32_vx_cra_init_zero, |
|
}, |
|
}, |
|
/* CRC-32C LE */ |
|
{ |
|
.init = crc32_vx_init, |
|
.setkey = crc32_vx_setkey, |
|
.update = crc32c_vx_update, |
|
.final = crc32c_vx_final, |
|
.finup = crc32c_vx_finup, |
|
.digest = crc32c_vx_digest, |
|
.descsize = sizeof(struct crc_desc_ctx), |
|
.digestsize = CRC32_DIGEST_SIZE, |
|
.base = { |
|
.cra_name = "crc32c", |
|
.cra_driver_name = "crc32c-vx", |
|
.cra_priority = 200, |
|
.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, |
|
.cra_blocksize = CRC32_BLOCK_SIZE, |
|
.cra_ctxsize = sizeof(struct crc_ctx), |
|
.cra_module = THIS_MODULE, |
|
.cra_init = crc32_vx_cra_init_invert, |
|
}, |
|
}, |
|
}; |
|
|
|
|
|
static int __init crc_vx_mod_init(void) |
|
{ |
|
return crypto_register_shashes(crc32_vx_algs, |
|
ARRAY_SIZE(crc32_vx_algs)); |
|
} |
|
|
|
static void __exit crc_vx_mod_exit(void) |
|
{ |
|
crypto_unregister_shashes(crc32_vx_algs, ARRAY_SIZE(crc32_vx_algs)); |
|
} |
|
|
|
module_cpu_feature_match(VXRS, crc_vx_mod_init); |
|
module_exit(crc_vx_mod_exit); |
|
|
|
MODULE_AUTHOR("Hendrik Brueckner <[email protected]>"); |
|
MODULE_LICENSE("GPL"); |
|
|
|
MODULE_ALIAS_CRYPTO("crc32"); |
|
MODULE_ALIAS_CRYPTO("crc32-vx"); |
|
MODULE_ALIAS_CRYPTO("crc32c"); |
|
MODULE_ALIAS_CRYPTO("crc32c-vx");
|
|
|