include/linux/byteorder: Sync to latest Linux definitions

generic.h has changed in Linux and new addtionals functions were
added.

This commit takes the latest and greatest from Linux (v4.17-rc5)
to aid with porting drivers that utilize these functions.

Signed-off-by: Ramon Fried <ramon.fried@gmail.com>

include/linux/byteorder/generic.h

@@ -1,10 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _LINUX_BYTEORDER_GENERIC_H
 #define _LINUX_BYTEORDER_GENERIC_H
 
 /*
- * linux/byteorder_generic.h
+ * linux/byteorder/generic.h
  * Generic Byte-reordering support
  *
+ * The "... p" macros, like le64_to_cpup, can be used with pointers
+ * to unaligned data, but there will be a performance penalty on
+ * some architectures.  Use get_unaligned for unaligned data.
+ *
  * Francois-Rene Rideau <fare@tunes.org> 19970707
  *    gathered all the good ideas from all asm-foo/byteorder.h into one file,
  *    cleaned them up.
@@ -78,12 +83,6 @@
  *
  */
 
-
-#if defined(__KERNEL__)
-/*
- * inside the kernel, we can use nicknames;
- * outside of it, we must avoid POSIX namespace pollution...
- */
 #define cpu_to_le64 __cpu_to_le64
 #define le64_to_cpu __le64_to_cpu
 #define cpu_to_le32 __cpu_to_le32
@@ -120,18 +119,8 @@
 #define be32_to_cpus __be32_to_cpus
 #define cpu_to_be16s __cpu_to_be16s
 #define be16_to_cpus __be16_to_cpus
-#endif
-
 
 /*
- * Handle ntohl and suches. These have various compatibility
- * issues - like we want to give the prototype even though we
- * also have a macro for them in case some strange program
- * wants to take the address of the thing or something..
- *
- * Note that these used to return a "long" in libc5, even though
- * long is often 64-bit these days.. Thus the casts.
- *
  * They have to be macros in order to do the constant folding
  * correctly - if the argument passed into a inline function
  * it is no longer constant according to gcc..
@@ -142,39 +131,77 @@
 #undef htonl
 #undef htons
 
-/*
- * Do the prototypes. Somebody might want to take the
- * address or some such sick thing..
- */
-#if defined(__KERNEL__) || (defined (__GLIBC__) && __GLIBC__ >= 2)
-extern __u32			ntohl(__u32);
-extern __u32			htonl(__u32);
-#else
-extern unsigned long int	ntohl(unsigned long int);
-extern unsigned long int	htonl(unsigned long int);
-#endif
-extern unsigned short int	ntohs(unsigned short int);
-extern unsigned short int	htons(unsigned short int);
-
-
-#if defined(__GNUC__) && (__GNUC__ >= 2)
-
 #define ___htonl(x) __cpu_to_be32(x)
 #define ___htons(x) __cpu_to_be16(x)
 #define ___ntohl(x) __be32_to_cpu(x)
 #define ___ntohs(x) __be16_to_cpu(x)
 
-#if defined(__KERNEL__) || (defined (__GLIBC__) && __GLIBC__ >= 2)
 #define htonl(x) ___htonl(x)
 #define ntohl(x) ___ntohl(x)
-#else
-#define htonl(x) ((unsigned long)___htonl(x))
-#define ntohl(x) ((unsigned long)___ntohl(x))
-#endif
 #define htons(x) ___htons(x)
 #define ntohs(x) ___ntohs(x)
 
-#endif /* OPTIMIZE */
+static inline void le16_add_cpu(__le16 *var, u16 val)
+{
+	*var = cpu_to_le16(le16_to_cpu(*var) + val);
+}
+
+static inline void le32_add_cpu(__le32 *var, u32 val)
+{
+	*var = cpu_to_le32(le32_to_cpu(*var) + val);
+}
+
+static inline void le64_add_cpu(__le64 *var, u64 val)
+{
+	*var = cpu_to_le64(le64_to_cpu(*var) + val);
+}
+
+/* XXX: this stuff can be optimized */
+static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
+{
+	while (words--) {
+		__le32_to_cpus(buf);
+		buf++;
+	}
+}
+
+static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
+{
+	while (words--) {
+		__cpu_to_le32s(buf);
+		buf++;
+	}
+}
+
+static inline void be16_add_cpu(__be16 *var, u16 val)
+{
+	*var = cpu_to_be16(be16_to_cpu(*var) + val);
+}
+
+static inline void be32_add_cpu(__be32 *var, u32 val)
+{
+	*var = cpu_to_be32(be32_to_cpu(*var) + val);
+}
+
+static inline void be64_add_cpu(__be64 *var, u64 val)
+{
+	*var = cpu_to_be64(be64_to_cpu(*var) + val);
+}
+
+static inline void cpu_to_be32_array(__be32 *dst, const u32 *src, size_t len)
+{
+	int i;
+
+	for (i = 0; i < len; i++)
+		dst[i] = cpu_to_be32(src[i]);
+}
+
+static inline void be32_to_cpu_array(u32 *dst, const __be32 *src, size_t len)
+{
+	int i;
 
+	for (i = 0; i < len; i++)
+		dst[i] = be32_to_cpu(src[i]);
+}
 
 #endif /* _LINUX_BYTEORDER_GENERIC_H */