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net: ip: net_pkt: Implement net_pkt_shallow_clone

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This commit implements net_pkt_shallow_clone. A shallow clone clones
the net_pkt but not the buffers. The buffers are only referenced and
therefor only freed when both copies of the net_pkt are freed.

Signed-off-by: Alexander Wachter <alexander.wachter@student.tugraz.at>
This commit is contained in:
Alexander Wachter 2019-06-07 17:52:05 +02:00 • committed by Jukka Rissanen
commit 95863a73da
2 changed files with 76 additions and 22 deletions
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10
include/net/net_pkt.h
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@ -1553,6 +1553,16 @@ int net_pkt_copy(struct net_pkt *pkt_dst,
*/
struct net_pkt *net_pkt_clone(struct net_pkt *pkt, s32_t timeout);
/**
* @brief Clone pkt and increase the refcount of its buffer.
*
* @param pkt Original pkt to be shallow cloned
* @param timeout Timeout to wait for free packet
*
* @return NULL if error, cloned packet otherwise.
*/
struct net_pkt *net_pkt_shallow_clone(struct net_pkt *pkt, s32_t timeout);
/**
* @brief Read some data from a net_pkt
*