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Subject[PATCH v2 3/6] crypto: tcrypt: allow setting num of bufs
Date
For multiple buffers speed tests, the number of buffers, or
requests, used actually sets the level of parallelism a tfm
provider may utilize to hide latency. The existing number
(of 8) is good for some software based providers but not
enough for many HW providers with deep FIFOs.

Add a module parameter that allows setting the number of
multiple buffers/requests used, leaving the default at 8.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
---
crypto/tcrypt.c | 31 +++++++++++++++++++------------
1 file changed, 19 insertions(+), 12 deletions(-)

diff --git a/crypto/tcrypt.c b/crypto/tcrypt.c
index 69c8e63..2604360 100644
--- a/crypto/tcrypt.c
+++ b/crypto/tcrypt.c
@@ -67,6 +67,7 @@ static char *alg = NULL;
static u32 type;
static u32 mask;
static int mode;
+static u32 num_mb = 8;
static char *tvmem[TVMEMSIZE];

static char *check[] = {
@@ -413,7 +414,7 @@ struct test_mb_ahash_data {
};

static void test_mb_ahash_speed(const char *algo, unsigned int sec,
- struct hash_speed *speed)
+ struct hash_speed *speed, u32 num_mb)
{
struct test_mb_ahash_data *data;
struct crypto_ahash *tfm;
@@ -422,7 +423,7 @@ static void test_mb_ahash_speed(const char *algo, unsigned int sec,
unsigned int i, j, k;
int ret;

- data = kzalloc(sizeof(*data) * 8, GFP_KERNEL);
+ data = kcalloc(num_mb, sizeof(*data), GFP_KERNEL);
if (!data)
return;

@@ -433,7 +434,7 @@ static void test_mb_ahash_speed(const char *algo, unsigned int sec,
goto free_data;
}

- for (i = 0; i < 8; ++i) {
+ for (i = 0; i < num_mb; ++i) {
if (testmgr_alloc_buf(data[i].xbuf))
goto out;

@@ -473,7 +474,7 @@ static void test_mb_ahash_speed(const char *algo, unsigned int sec,
if (speed[i].klen)
crypto_ahash_setkey(tfm, tvmem[0], speed[i].klen);

- for (k = 0; k < 8; k++)
+ for (k = 0; k < num_mb; k++)
ahash_request_set_crypt(data[k].req, data[k].sg,
data[k].result, speed[i].blen);

@@ -484,7 +485,7 @@ static void test_mb_ahash_speed(const char *algo, unsigned int sec,

start = get_cycles();

- for (k = 0; k < 8; k++) {
+ for (k = 0; k < num_mb; k++) {
ret = crypto_ahash_digest(data[k].req);
if (ret == -EINPROGRESS) {
ret = 0;
@@ -509,7 +510,7 @@ static void test_mb_ahash_speed(const char *algo, unsigned int sec,
end = get_cycles();
cycles = end - start;
pr_cont("%6lu cycles/operation, %4lu cycles/byte\n",
- cycles, cycles / (8 * speed[i].blen));
+ cycles, cycles / (num_mb * speed[i].blen));

if (ret) {
pr_err("At least one hashing failed ret=%d\n", ret);
@@ -518,10 +519,10 @@ static void test_mb_ahash_speed(const char *algo, unsigned int sec,
}

out:
- for (k = 0; k < 8; ++k)
+ for (k = 0; k < num_mb; ++k)
ahash_request_free(data[k].req);

- for (k = 0; k < 8; ++k)
+ for (k = 0; k < num_mb; ++k)
testmgr_free_buf(data[k].xbuf);

crypto_free_ahash(tfm);
@@ -1815,19 +1816,23 @@ static int do_test(const char *alg, u32 type, u32 mask, int m)
if (mode > 400 && mode < 500) break;
/* fall through */
case 422:
- test_mb_ahash_speed("sha1", sec, generic_hash_speed_template);
+ test_mb_ahash_speed("sha1", sec, generic_hash_speed_template,
+ num_mb);
if (mode > 400 && mode < 500) break;
/* fall through */
case 423:
- test_mb_ahash_speed("sha256", sec, generic_hash_speed_template);
+ test_mb_ahash_speed("sha256", sec, generic_hash_speed_template,
+ num_mb);
if (mode > 400 && mode < 500) break;
/* fall through */
case 424:
- test_mb_ahash_speed("sha512", sec, generic_hash_speed_template);
+ test_mb_ahash_speed("sha512", sec, generic_hash_speed_template,
+ num_mb);
if (mode > 400 && mode < 500) break;
/* fall through */
case 425:
- test_mb_ahash_speed("sm3", sec, generic_hash_speed_template);
+ test_mb_ahash_speed("sm3", sec, generic_hash_speed_template,
+ num_mb);
if (mode > 400 && mode < 500) break;
/* fall through */
case 499:
@@ -2106,6 +2111,8 @@ module_param(mode, int, 0);
module_param(sec, uint, 0);
MODULE_PARM_DESC(sec, "Length in seconds of speed tests "
"(defaults to zero which uses CPU cycles instead)");
+module_param(num_mb, uint, 0000);
+MODULE_PARM_DESC(num_mb, "Number of concurrent requests to be used in mb speed tests (defaults to 8)");

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Quick & dirty crypto testing module");
--
2.7.4
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