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[iobuf] Add iob_split() to split an I/O buffer into portions

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RNDIS devices may provide multiple packets encapsulated into a single
message.  Provide an API to allow the RNDIS driver to split an I/O
buffer into smaller portions.

The current implementation will always copy the underlying data,
rather than splitting the buffer in situ.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2014-12-11 17:10:01 +00:00
parent d83fb45b66
commit c86b22221d
2 changed files with 31 additions and 0 deletions
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src/include/ipxe/iobuf.h
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@@ -217,5 +217,6 @@ extern void free_iob ( struct io_buffer *iobuf );
extern void iob_pad ( struct io_buffer *iobuf, size_t min_len );
extern int iob_ensure_headroom ( struct io_buffer *iobuf, size_t len );
extern struct io_buffer * iob_concatenate ( struct list_head *list );
extern struct io_buffer * iob_split ( struct io_buffer *iobuf, size_t len );
#endif /* _IPXE_IOBUF_H */