s390/zcrypt: introduce ctfm field in struct CPRBX

Modify the CPRBX struct to expose a new field ctfm for use with hardware
command filtering within a CEX8 crypto card in CCA coprocessor mode.

The field replaces a reserved byte padding field so that the layout of the
struct and the size does not change.

The new field is used only by user space applications which may use this to
expose the HW filtering facilities in the crypto firmware layers.

Signed-off-by: Harald Freudenberger <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>

Author: hfreude

arch/s390/include/uapi/asm/zcrypt.h

@@ -85,7 +85,8 @@ struct ica_rsa_modexpo_crt {
 struct CPRBX {
 	__u16	     cprb_len;		/* CPRB length	      220	 */
 	__u8	     cprb_ver_id;	/* CPRB version id.   0x02	 */
-	__u8	     _pad_000[3];	/* Alignment pad bytes		 */
+	__u8	     ctfm;		/* Command Type Filtering Mask	 */
+	__u8	     pad_000[2];	/* Alignment pad bytes		 */
 	__u8	     func_id[2];	/* function id	      0x5432	 */
 	__u8	     cprb_flags[4];	/* Flags			 */
 	__u32	     req_parml;		/* request parameter buffer len	 */