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mbuf: add function returning buffer address

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This patch introduces two new functions - rte_mbuf_buf_addr() and
rte_mbuf_data_addr_default().

rte_mbuf_buf_addr() reutrns the buffer address of given mbuf which comes
after mbuf structure and private data.

rte_mbuf_data_addr_default() returns the default address of mbuf data
taking the headroom into account.

Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>
This commit is contained in:
Yongseok Koh 2019-01-14 13:16:21 -08:00 committed by Thomas Monjalon
parent b6ec9ce9e3
commit c277b34c1b
1 changed files with 53 additions and 1 deletions
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54
lib/librte_mbuf/rte_mbuf.h
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@ -791,7 +791,55 @@ rte_mbuf_from_indirect(struct rte_mbuf *mi)
}
/**
* Return the buffer address embedded in the given mbuf.
* Return address of buffer embedded in the given mbuf.
*
* The return value shall be same as mb->buf_addr if the mbuf is already
* initialized and direct. However, this API is useful if mempool of the
* mbuf is already known because it doesn't need to access mbuf contents in
* order to get the mempool pointer.
*
* @warning
* @b EXPERIMENTAL: This API may change without prior notice.
* This will be used by rte_mbuf_to_baddr() which has redundant code once
* experimental tag is removed.
*
* @param mb
* The pointer to the mbuf.
* @param mp
* The pointer to the mempool of the mbuf.
* @return
* The pointer of the mbuf buffer.
*/
static inline char * __rte_experimental
rte_mbuf_buf_addr(struct rte_mbuf *mb, struct rte_mempool *mp)
{
return (char *)mb + sizeof(*mb) + rte_pktmbuf_priv_size(mp);
}
/**
* Return the default address of the beginning of the mbuf data.
*
* @warning
* @b EXPERIMENTAL: This API may change without prior notice.
*
* @param mb
* The pointer to the mbuf.
* @return
* The pointer of the beginning of the mbuf data.
*/
static inline char * __rte_experimental
rte_mbuf_data_addr_default(struct rte_mbuf *mb)
{
return rte_mbuf_buf_addr(mb, mb->pool) + RTE_PKTMBUF_HEADROOM;
}
/**
* Return address of buffer embedded in the given mbuf.
*
* @note: Accessing mempool pointer of a mbuf is expensive because the
* pointer is stored in the 2nd cache line of mbuf. If mempool is known, it
* is better not to reference the mempool pointer in mbuf but calling
* rte_mbuf_buf_addr() would be more efficient.
*
* @param md
* The pointer to the mbuf.
@ -801,9 +849,13 @@ rte_mbuf_from_indirect(struct rte_mbuf *mi)
static inline char *
rte_mbuf_to_baddr(struct rte_mbuf *md)
{
#ifdef ALLOW_EXPERIMENTAL_API
return rte_mbuf_buf_addr(md, md->pool);
#else
char *buffer_addr;
buffer_addr = (char *)md + sizeof(*md) + rte_pktmbuf_priv_size(md->pool);
return buffer_addr;
#endif
}
/**