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[CRYPTO]: Use CPU cycle counters in tcrypt 

After using this facility for a while to test my changes to the
cipher crypt() layer, I realised that I should've listend to Dave
and made this thing use CPU cycle counters :) As it is it's too
jittery for me to feel safe about relying on the results.

So here is a patch to make it use CPU cycles by default but fall
back to jiffies if the user specifies a non-zero sec value.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2005-06-22 13:29:03 -07:00 committed by David S. Miller
parent dce907c00f
commit 6a17944ca1
1 changed files with 95 additions and 21 deletions
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116
crypto/tcrypt.c
View File

@ -27,6 +27,8 @@
#include <linux/highmem.h>
#include <linux/moduleparam.h>
#include <linux/jiffies.h>
#include <linux/timex.h>
#include <linux/interrupt.h>
#include "tcrypt.h"
/*
@ -60,7 +62,7 @@ static unsigned int IDX[8] = { IDX1, IDX2, IDX3, IDX4, IDX5, IDX6, IDX7, IDX8 };
/*
* Used by test_cipher_speed()
*/
static unsigned int sec = 10;
static unsigned int sec;
static int mode;
static char *xbuf;
@ -426,6 +428,88 @@ out:
crypto_free_tfm(tfm);
}
static int test_cipher_jiffies(struct crypto_tfm *tfm, int enc, char *p,
int blen, int sec)
{
struct scatterlist sg[8];
unsigned long start, end;
int bcount;
int ret;
sg[0].page = virt_to_page(p);
sg[0].offset = offset_in_page(p);
sg[0].length = blen;
for (start = jiffies, end = start + sec * HZ, bcount = 0;
time_before(jiffies, end); bcount++) {
if (enc)
ret = crypto_cipher_encrypt(tfm, sg, sg, blen);
else
ret = crypto_cipher_decrypt(tfm, sg, sg, blen);
if (ret)
return ret;
}
printk("%d operations in %d seconds (%ld bytes)\n",
bcount, sec, (long)bcount * blen);
return 0;
}
static int test_cipher_cycles(struct crypto_tfm *tfm, int enc, char *p,
int blen)
{
struct scatterlist sg[8];
unsigned long cycles = 0;
int ret = 0;
int i;
sg[0].page = virt_to_page(p);
sg[0].offset = offset_in_page(p);
sg[0].length = blen;
local_bh_disable();
local_irq_disable();
/* Warm-up run. */
for (i = 0; i < 4; i++) {
if (enc)
ret = crypto_cipher_encrypt(tfm, sg, sg, blen);
else
ret = crypto_cipher_decrypt(tfm, sg, sg, blen);
if (ret)
goto out;
}
/* The real thing. */
for (i = 0; i < 8; i++) {
cycles_t start, end;
start = get_cycles();
if (enc)
ret = crypto_cipher_encrypt(tfm, sg, sg, blen);
else
ret = crypto_cipher_decrypt(tfm, sg, sg, blen);
end = get_cycles();
if (ret)
goto out;
cycles += end - start;
}
out:
local_irq_enable();
local_bh_enable();
if (ret == 0)
printk("1 operation in %lu cycles (%d bytes)\n",
(cycles + 4) / 8, blen);
return ret;
}
static void test_cipher_speed(char *algo, int mode, int enc, unsigned int sec,
struct cipher_testvec *template,
unsigned int tcount, struct cipher_speed *speed)
@ -433,8 +517,6 @@ static void test_cipher_speed(char *algo, int mode, int enc, unsigned int sec,
unsigned int ret, i, j, iv_len;
unsigned char *key, *p, iv[128];
struct crypto_tfm *tfm;
struct scatterlist sg[8];
unsigned long start, bcount;
const char *e, *m;
if (enc == ENCRYPT)
@ -492,25 +574,16 @@ static void test_cipher_speed(char *algo, int mode, int enc, unsigned int sec,
crypto_cipher_set_iv(tfm, iv, iv_len);
}
for (start = jiffies, bcount = 0;
((jiffies - start) / HZ) < sec; bcount++) {
sg[0].page = virt_to_page(p);
sg[0].offset = offset_in_page(p);
sg[0].length = speed[i].blen;
if (sec)
ret = test_cipher_jiffies(tfm, enc, p, speed[i].blen,
sec);
else
ret = test_cipher_cycles(tfm, enc, p, speed[i].blen);
if (enc)
ret = crypto_cipher_encrypt(tfm, sg, sg, speed[i].blen);
else
ret = crypto_cipher_decrypt(tfm, sg, sg, speed[i].blen);
if (ret) {
printk("%s () failed flags=%x\n", e, tfm->crt_flags);
goto out;
}
if (ret) {
printk("%s() failed flags=%x\n", e, tfm->crt_flags);
break;
}
printk("%lu operations in %u seconds (%lu bytes)\n",
bcount, sec, bcount * speed[i].blen);
}
out:
@ -1063,7 +1136,8 @@ module_exit(fini);
module_param(mode, int, 0);
module_param(sec, uint, 0);
MODULE_PARM_DESC(sec, "Length in seconds of speed tests");
MODULE_PARM_DESC(sec, "Length in seconds of speed tests "
"(defaults to zero which uses CPU cycles instead)");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Quick & dirty crypto testing module");