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NET: Improvied I/O buffer logic

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This commit is contained in:
Gregory Nutt
2014-06-04 09:03:11 -06:00
parent 35eb466620
commit 67d5e8d154
7 changed files with 124 additions and 108 deletions
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include/nuttx/net/iob.h
+26 -5
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@@ -41,6 +41,10 @@
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <queue.h>
#include <nuttx/net/iob.h>
/****************************************************************************
@@ -57,7 +61,8 @@
****************************************************************************/
/* Represents one I/O buffer. A packet is contained by one or more I/O
* buffers in a chain.
* buffers in a chain. The io_flags, io_pktlen, io_vtag and io_priv
* fields are only valid for the I/O buffer at the head of the chain.
*/
struct iob_s
@@ -65,6 +70,7 @@ struct iob_s
sq_entry_t io_link; /* Link to the next I/O buffer in the chain */
uint8_t io_flags; /* Flags associated with the I/O buffer */
uint16_t io_len; /* Length of the data in the entry */
uint16_t io_offset; /* Data begins at this offset */
uint16_t io_pktlen; /* Total length of the packet */
uint16_t io_vtag; /* VLAN tag */
void *io_priv; /* User private data attached to the I/O buffer */
@@ -146,20 +152,35 @@ void iob_concat(FAR struct iob_s *iob1, FAR struct iob_s *iob2);
* Name: iob_trimhead
*
* Description:
* Remove bytes from the beginning of an I/O chain
* Remove bytes from the beginning of an I/O chain. Emptied I/O buffers
* are freed and, hence, the beginning of the chain may change.
*
****************************************************************************/
void iob_trimhead(FAR struct iob_s *iob, unsigned int trimlen);
FAR struct iob_s *iob_trimhead(FAR struct iob_s *iob, unsigned int trimlen);
/****************************************************************************
* Name: iob_trimtail
*
* Description:
* Remove bytes from the end of an I/O chain
* Remove bytes from the end of an I/O chain. Emptied I/O buffers are
* freed NULL will be returned in the special case where the entry I/O
* buffer chain is freed.
*
****************************************************************************/
void iob_trimtail(FAR struct iob_s *iob, unsigned int trimlen);
FAR struct iob_s *iob_trimtail(FAR struct iob_s *iob, unsigned int trimlen);
/****************************************************************************
* Name: iob_pack
*
* Description:
* Pack all data in the I/O buffer chain so that the data offset is zero
* and all but the final buffer in the chain are filled. Any emptied
* buffers at the end of the chain are freed.
*
****************************************************************************/
FAR struct iob_s *iob_pack(FAR struct iob_s *iob);
#endif /* _INCLUDE_NUTTX_NET_IOB_H */