erasure_code: check for size alignment on powerpc gf_vect_mul_vsx implementation

Follows the rest of the gf_vect_mul implementations for other architectures,
and checks for size alignment, stated in the documentation.

Signed-off-by: Pablo de Lara <[email protected]>

Author: pablodelara

erasure_code/gf_vect_mul_test.c

@@ -171,7 +171,6 @@ int main(int argc, char *argv[])
 #endif
 	}
 
-#if !defined(ppc64le)
 	// Test all unsupported sizes up to TEST_SIZE
 	for (size = 0; size < TEST_SIZE; size++) {
 		if (size % align != 0 && gf_vect_mul(size, gf_const_tbl, buff1, buff2) == 0) {
@@ -181,10 +180,7 @@ int main(int argc, char *argv[])
 			goto exit;
 		}
 	}
-#else
-	printf
-	    ("WARNING: Test disabled on PPC due to known issue https://github.com/intel/isa-l/issues/263\n");
-#endif
+
 	printf(" done: Pass\n");
 	fflush(0);
 

erasure_code/ppc64le/ec_base_vsx.c

@@ -92,6 +92,10 @@ void ec_encode_data_update(int len, int k, int rows, int vec_i, unsigned char *v
 
 int gf_vect_mul(int len, unsigned char *a, void *src, void *dest)
 {
+	/* Size must be aligned to 32 bytes */
+	if ((len % 32) != 0)
+		return -1;
+
 	gf_vect_mul_vsx(len, a, (unsigned char *)src, (unsigned char *)dest);
 	return 0;
 }