net: buf: Add support for 48 bit data type

This enables pulling and pushing values in 48 bit format.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

include/net/buf.h

@@ -291,6 +291,30 @@ void net_buf_simple_add_le32(struct net_buf_simple *buf, u32_t val);
  */
 void net_buf_simple_add_be32(struct net_buf_simple *buf, u32_t val);
 
+/**
+ * @brief Add 48-bit value at the end of the buffer
+ *
+ * Adds 48-bit value in little endian format at the end of buffer.
+ * Increments the data length of a buffer to account for more data
+ * at the end.
+ *
+ * @param buf Buffer to update.
+ * @param val 48-bit value to be added.
+ */
+void net_buf_simple_add_le48(struct net_buf_simple *buf, u64_t val);
+
+/**
+ * @brief Add 48-bit value at the end of the buffer
+ *
+ * Adds 48-bit value in big endian format at the end of buffer.
+ * Increments the data length of a buffer to account for more data
+ * at the end.
+ *
+ * @param buf Buffer to update.
+ * @param val 48-bit value to be added.
+ */
+void net_buf_simple_add_be48(struct net_buf_simple *buf, u64_t val);
+
 /**
  * @brief Push data to the beginning of the buffer.
  *
@@ -446,6 +470,30 @@ u32_t net_buf_simple_pull_le32(struct net_buf_simple *buf);
  */
 u32_t net_buf_simple_pull_be32(struct net_buf_simple *buf);
 
+/**
+ * @brief Remove and convert 48 bits from the beginning of the buffer.
+ *
+ * Same idea as with net_buf_simple_pull(), but a helper for operating
+ * on 48-bit little endian data.
+ *
+ * @param buf A valid pointer on a buffer.
+ *
+ * @return 48-bit value converted from little endian to host endian.
+ */
+u64_t net_buf_simple_pull_le48(struct net_buf_simple *buf);
+
+/**
+ * @brief Remove and convert 48 bits from the beginning of the buffer.
+ *
+ * Same idea as with net_buf_simple_pull(), but a helper for operating
+ * on 48-bit big endian data.
+ *
+ * @param buf A valid pointer on a buffer.
+ *
+ * @return 48-bit value converted from big endian to host endian.
+ */
+u64_t net_buf_simple_pull_be48(struct net_buf_simple *buf);
+
 /**
  * @brief Get the tail pointer for a buffer.
  *
@@ -1212,6 +1260,32 @@ static inline void *net_buf_user_data(const struct net_buf *buf)
  */
 #define net_buf_add_be32(buf, val) net_buf_simple_add_be32(&(buf)->b, val)
 
+/**
+ * @def net_buf_add_le48
+ * @brief Add 48-bit value at the end of the buffer
+ *
+ * Adds 48-bit value in little endian format at the end of buffer.
+ * Increments the data length of a buffer to account for more data
+ * at the end.
+ *
+ * @param buf Buffer to update.
+ * @param val 48-bit value to be added.
+ */
+#define net_buf_add_le48(buf, val) net_buf_simple_add_le48(&(buf)->b, val)
+
+/**
+ * @def net_buf_add_be48
+ * @brief Add 48-bit value at the end of the buffer
+ *
+ * Adds 48-bit value in big endian format at the end of buffer.
+ * Increments the data length of a buffer to account for more data
+ * at the end.
+ *
+ * @param buf Buffer to update.
+ * @param val 48-bit value to be added.
+ */
+#define net_buf_add_be48(buf, val) net_buf_simple_add_be48(&(buf)->b, val)
+
 /**
  * @def net_buf_push
  * @brief Push data to the beginning of the buffer.
@@ -1380,6 +1454,32 @@ static inline void *net_buf_user_data(const struct net_buf *buf)
  */
 #define net_buf_pull_be32(buf) net_buf_simple_pull_be32(&(buf)->b)
 
+/**
+ * @def net_buf_pull_le48
+ * @brief Remove and convert 48 bits from the beginning of the buffer.
+ *
+ * Same idea as with net_buf_pull(), but a helper for operating on
+ * 48-bit little endian data.
+ *
+ * @param buf A valid pointer on a buffer.
+ *
+ * @return 48-bit value converted from little endian to host endian.
+ */
+#define net_buf_pull_le48(buf) net_buf_simple_pull_le48(&(buf)->b)
+
+/**
+ * @def net_buf_pull_be48
+ * @brief Remove and convert 48 bits from the beginning of the buffer.
+ *
+ * Same idea as with net_buf_pull(), but a helper for operating on
+ * 48-bit big endian data.
+ *
+ * @param buf A valid pointer on a buffer
+ *
+ * @return 48-bit value converted from big endian to host endian.
+ */
+#define net_buf_pull_be48(buf) net_buf_simple_pull_be48(&(buf)->b)
+
 /**
  * @def net_buf_tailroom
  * @brief Check buffer tailroom.