crypto: tcrypt - add skcipher speed for given alg

Allow to run skcipher speed for given algorithm.
Case 600 is modified to cover ENCRYPT and DECRYPT
directions.

Example:
   modprobe tcrypt mode=600 alg="qat_aes_xts" klen=32

If succeed, the performance numbers will be printed in dmesg:
   testing speed of multibuffer qat_aes_xts (qat_aes_xts) encryption
   test 0 (256 bit key, 16 byte blocks): 1 operation in 14596 cycles (16 bytes)
   ...
   test 6 (256 bit key, 4096 byte blocks): 1 operation in 8053 cycles (4096 bytes)
Signed-off-by: Sergey Portnoy <sergey.portnoy@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/tcrypt.c

@@ -2613,6 +2613,15 @@ static int do_test(const char *alg, u32 type, u32 mask, int m, u32 num_mb)
 		break;
 
 	case 600:
+		if (alg) {
+			u8 speed_template[2] = {klen, 0};
+			test_mb_skcipher_speed(alg, ENCRYPT, sec, NULL, 0,
+					       speed_template, num_mb);
+			test_mb_skcipher_speed(alg, DECRYPT, sec, NULL, 0,
+					       speed_template, num_mb);
+			break;
+		}
+
 		test_mb_skcipher_speed("ecb(aes)", ENCRYPT, sec, NULL, 0,
 				       speed_template_16_24_32, num_mb);
 		test_mb_skcipher_speed("ecb(aes)", DECRYPT, sec, NULL, 0,