[dpdk-dev] [PATCH 2/2] Adding the routines rte_pktmbuf_alloc_bulk() and rte_pktmbuf_free_bulk()

Keith Wiles keith.wiles at windriver.com
Sun Oct 5 01:10:29 CEST 2014


Minor helper routines to mirror the mempool routines and remove the code
from applications. The ixgbe_rxtx_vec.c routine could be changed to use
the ret_pktmbuf_alloc_bulk() routine inplace of rte_mempool_get_bulk().

Signed-off-by: Keith Wiles <keith.wiles at windriver.com>
---
 lib/librte_mbuf/rte_mbuf.h | 77 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)

diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index 1c6e115..f298621 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -546,6 +546,41 @@ static inline void rte_pktmbuf_reset(struct rte_mbuf *m)
 }
 
 /**
+ * @internal Allocate a list of mbufs from mempool *mp*.
+ * The use of that function is reserved for RTE internal needs.
+ * Please use rte_pktmbuf_alloc_bulk().
+ *
+ * @param mp
+ *   The mempool from which mbuf is allocated.
+ * @param m_list
+ *   The array to place the allocated rte_mbufs pointers.
+ * @param cnt
+ *   The number of mbufs to allocate
+ * @return
+ *   - 0 if the number of mbufs allocated was ok
+ *   - <0 is an ERROR.
+ */
+static inline int __rte_mbuf_raw_alloc_bulk(struct rte_mempool *mp, struct rte_mbuf *m_list[], int cnt)
+{
+	struct rte_mbuf *m;
+	int		ret;
+
+	ret = rte_mempool_get_bulk(mp, (void **)m_list, cnt);
+	if ( ret == 0 ) {
+		int		i;
+		for(i = 0; i < cnt; i++) {
+			m = *m_list++;
+#ifdef RTE_MBUF_REFCNT
+			rte_mbuf_refcnt_set(m, 1);
+#endif /* RTE_MBUF_REFCNT */
+			rte_pktmbuf_reset(m);
+		}
+		ret = cnt;
+	}
+	return ret;
+}
+
+/**
  * Allocate a new mbuf from a mempool.
  *
  * This new mbuf contains one segment, which has a length of 0. The pointer
@@ -671,6 +706,32 @@ __rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
 }
 
 /**
+ * Allocate a list of mbufs from a mempool into a mbufs array.
+ *
+ * This mbuf list contains one segment per mbuf, which has a length of 0. The pointer
+ * to data is initialized to have some bytes of headroom in the buffer
+ * (if buffer size allows).
+ *
+ * The routine is just a simple wrapper routine to reduce code in the application and
+ * provide a cleaner API for multiple mbuf requests.
+ *
+ * @param mp
+ *   The mempool from which the mbuf is allocated.
+ * @param m_list
+ *   An array of mbuf pointers, cnt must be less then or equal to the size of the list.
+ * @param cnt
+ *   Number of slots in the m_list array to fill.
+ * @return
+ *   - The number of valid mbufs pointers in the m_list array.
+ *   - Zero if the request cnt could not be allocated.
+ */
+static inline int __attribute__((always_inline))
+rte_pktmbuf_alloc_bulk(struct rte_mempool *mp, struct rte_mbuf *m_list[], int16_t cnt)
+{
+	return __rte_mbuf_raw_alloc_bulk(mp, m_list, cnt);
+}
+
+/**
  * Free a segment of a packet mbuf into its original mempool.
  *
  * Free an mbuf, without parsing other segments in case of chained
@@ -708,6 +769,22 @@ static inline void rte_pktmbuf_free(struct rte_mbuf *m)
 	}
 }
 
+/**
+ * Free a list of packet mbufs back into its original mempool.
+ *
+ * Free a list of mbufs by calling rte_pktmbuf_free() in a loop as a wrapper function.
+ *
+ * @param m_list
+ *   An array of rte_mbuf pointers to be freed.
+ * @param npkts
+ *   Number of packets to free in list.
+ */
+static inline void rte_pktmbuf_free_bulk(struct rte_mbuf *m_list[], int16_t npkts)
+{
+	while(npkts--)
+		rte_pktmbuf_free(*m_list++);
+}
+
 #ifdef RTE_MBUF_REFCNT
 
 /**
-- 
2.1.0



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