crypto: powerpc - Stress test for vpmsum implementations

vpmsum implementations often don't kick in for short test vectors.
This is a simple test module that does a configurable number of
random tests, each up to 64kB and each with random offsets.

Both CRC-T10DIF and CRC32C are tested.

Cc: Anton Blanchard <anton@samba.org>
Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/arch/powerpc/crypto/Makefile b/arch/powerpc/crypto/Makefile
index e66aaf19764df473f1d81a337b193fb7de2b59bb..67eca3af9fc7785462ed6c2d43e6a4b9ce8ec200 100644 (file)
--- a/arch/powerpc/crypto/Makefile
+++ b/arch/powerpc/crypto/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_CRYPTO_SHA1_PPC_SPE) += sha1-ppc-spe.o
 obj-$(CONFIG_CRYPTO_SHA256_PPC_SPE) += sha256-ppc-spe.o
 obj-$(CONFIG_CRYPTO_CRC32C_VPMSUM) += crc32c-vpmsum.o
 obj-$(CONFIG_CRYPTO_CRCT10DIF_VPMSUM) += crct10dif-vpmsum.o
+obj-$(CONFIG_CRYPTO_VPMSUM_TESTER) += crc-vpmsum_test.o
 
 aes-ppc-spe-y := aes-spe-core.o aes-spe-keys.o aes-tab-4k.o aes-spe-modes.o aes-spe-glue.o
 md5-ppc-y := md5-asm.o md5-glue.o

diff --git a/arch/powerpc/crypto/crc-vpmsum_test.c b/arch/powerpc/crypto/crc-vpmsum_test.c
new file mode 100644 (file)
index 0000000..0153a9c
--- /dev/null
+++ b/arch/powerpc/crypto/crc-vpmsum_test.c
@@ -0,0 +1,137 @@
+/*
+ * CRC vpmsum tester
+ * Copyright 2017 Daniel Axtens, IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/crc-t10dif.h>
+#include <linux/crc32.h>
+#include <crypto/internal/hash.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/cpufeature.h>
+#include <asm/switch_to.h>
+
+static unsigned long iterations = 10000;
+
+#define MAX_CRC_LENGTH 65535
+
+
+static int __init crc_test_init(void)
+{
+       u16 crc16 = 0, verify16 = 0;
+       u32 crc32 = 0, verify32 = 0;
+       __le32 verify32le = 0;
+       unsigned char *data;
+       unsigned long i;
+       int ret;
+
+       struct crypto_shash *crct10dif_tfm;
+       struct crypto_shash *crc32c_tfm;
+
+       if (!cpu_has_feature(CPU_FTR_ARCH_207S))
+               return -ENODEV;
+
+       data = kmalloc(MAX_CRC_LENGTH, GFP_KERNEL);
+       if (!data)
+               return -ENOMEM;
+
+       crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0);
+
+       if (IS_ERR(crct10dif_tfm)) {
+               pr_err("Error allocating crc-t10dif\n");
+               goto free_buf;
+       }
+
+       crc32c_tfm = crypto_alloc_shash("crc32c", 0, 0);
+
+       if (IS_ERR(crc32c_tfm)) {
+               pr_err("Error allocating crc32c\n");
+               goto free_16;
+       }
+
+       do {
+               SHASH_DESC_ON_STACK(crct10dif_shash, crct10dif_tfm);
+               SHASH_DESC_ON_STACK(crc32c_shash, crc32c_tfm);
+
+               crct10dif_shash->tfm = crct10dif_tfm;
+               ret = crypto_shash_init(crct10dif_shash);
+
+               if (ret) {
+                       pr_err("Error initing crc-t10dif\n");
+                       goto free_32;
+               }
+
+
+               crc32c_shash->tfm = crc32c_tfm;
+               ret = crypto_shash_init(crc32c_shash);
+
+               if (ret) {
+                       pr_err("Error initing crc32c\n");
+                       goto free_32;
+               }
+
+               pr_info("crc-vpmsum_test begins, %lu iterations\n", iterations);
+               for (i=0; i<iterations; i++) {
+                       size_t len, offset;
+
+                       get_random_bytes(data, MAX_CRC_LENGTH);
+                       get_random_bytes(&len, sizeof(len));
+                       get_random_bytes(&offset, sizeof(offset));
+
+                       len %= MAX_CRC_LENGTH;
+                       offset &= 15;
+                       if (len <= offset)
+                               continue;
+                       len -= offset;
+
+                       crypto_shash_update(crct10dif_shash, data+offset, len);
+                       crypto_shash_final(crct10dif_shash, (u8 *)(&crc16));
+                       verify16 = crc_t10dif_generic(verify16, data+offset, len);
+
+
+                       if (crc16 != verify16) {
+                               pr_err("FAILURE in CRC16: got 0x%04x expected 0x%04x (len %lu)\n",
+                                      crc16, verify16, len);
+                               break;
+                       }
+
+                       crypto_shash_update(crc32c_shash, data+offset, len);
+                       crypto_shash_final(crc32c_shash, (u8 *)(&crc32));
+                       verify32 = le32_to_cpu(verify32le);
+                       verify32le = ~cpu_to_le32(__crc32c_le(~verify32, data+offset, len));
+                       if (crc32 != (u32)verify32le) {
+                               pr_err("FAILURE in CRC32: got 0x%08x expected 0x%08x (len %lu)\n",
+                                      crc32, verify32, len);
+                               break;
+                       }
+               }
+               pr_info("crc-vpmsum_test done, completed %lu iterations\n", i);
+       } while (0);
+
+free_32:
+       crypto_free_shash(crc32c_tfm);
+
+free_16:
+       crypto_free_shash(crct10dif_tfm);
+
+free_buf:
+       kfree(data);
+
+       return 0;
+}
+
+static void __exit crc_test_exit(void) {}
+
+module_init(crc_test_init);
+module_exit(crc_test_exit);
+module_param(iterations, long, 0400);
+
+MODULE_AUTHOR("Daniel Axtens <dja@axtens.net>");
+MODULE_DESCRIPTION("Vector polynomial multiply-sum CRC tester");
+MODULE_LICENSE("GPL");

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 9cf63dd84364d7c32ec9b15e54c5fd300d47ed82..6854c1fe54b74659072afccacdfcb2481914cbc0 100644 (file)
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -522,6 +522,14 @@ config CRYPTO_CRCT10DIF_VPMSUM
          multiply-sum (vpmsum) instructions, introduced in POWER8. Enable on
          POWER8 and newer processors for improved performance.
 
+config CRYPTO_VPMSUM_TESTER
+       tristate "Powerpc64 vpmsum hardware acceleration tester"
+       depends on CRYPTO_CRCT10DIF_VPMSUM && CRYPTO_CRC32C_VPMSUM
+       help
+         Stress test for CRC32c and CRC-T10DIF algorithms implemented with
+         POWER8 vpmsum instructions.
+         Unless you are testing these algorithms, you don't need this.
+
 config CRYPTO_GHASH
        tristate "GHASH digest algorithm"
        select CRYPTO_GF128MUL