+int nxm_field_bytes(uint32_t header);
+int nxm_field_bits(uint32_t header);
+
+const char *nxm_parse_field_bits(const char *s,
+ uint32_t *headerp, int *ofsp, int *n_bitsp);
+void nxm_format_field_bits(struct ds *, uint32_t header, int ofs, int n_bits);
+
+/* Dealing with the 'ofs_nbits' members of struct nx_action_reg_load and struct
+ * nx_action_multipath. */
+
+static inline ovs_be16
+nxm_encode_ofs_nbits(int ofs, int n_bits)
+{
+ return htons((ofs << 6) | (n_bits - 1));
+}
+
+static inline int
+nxm_decode_ofs(ovs_be16 ofs_nbits)
+{
+ return ntohs(ofs_nbits) >> 6;
+}
+
+static inline int
+nxm_decode_n_bits(ovs_be16 ofs_nbits)
+{
+ return (ntohs(ofs_nbits) & 0x3f) + 1;
+}
+\f