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Commit 6a17944c authored by Herbert Xu's avatar Herbert Xu Committed by David S. Miller
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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: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent dce907c0

crypto/tcrypt.c

+95 −21
Original line number Diff line number Diff line
@@ -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 @@ static void test_cipher(char *algo, int mode, int enc, 
	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 (enc)

				ret = crypto_cipher_encrypt(tfm, sg, sg, speed[i].blen);

		if (sec)

			ret = test_cipher_jiffies(tfm, enc, p, speed[i].blen,

						  sec);

		else

				ret = crypto_cipher_decrypt(tfm, sg, sg, speed[i].blen);

			ret = test_cipher_cycles(tfm, enc, p, speed[i].blen);



		if (ret) {

			printk("%s() failed flags=%x\n", e, tfm->crt_flags);

				goto out;

			}

			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");