From: Stephen Hemminger <shemm...@brocade.com>
Added rte_pktmbuf_copy() function since copying multi-part
segments is common issue and can be problematic.
Signed-off-by: Mike Davison <mdavison at brocade.com>
Reviewed-by: Stephen Hemminger <shemming at brocade.com>
---
lib/librte_mbuf/rte_mbuf.h | 59 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 59 insertions(+)
diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index 80419df..f0a543b 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -60,6 +60,7 @@
#include <rte_atomic.h>
#include <rte_prefetch.h>
#include <rte_branch_prediction.h>
+#include <rte_memcpy.h>
#ifdef __cplusplus
extern "C" {
@@ -1272,6 +1273,64 @@ static inline int rte_pktmbuf_is_contiguous(const struct
rte_mbuf *m)
return !!(m->nb_segs == 1);
}
+/*
+ * Creates a copy of the given packet mbuf.
+ *
+ * Walks through all segments of the given packet mbuf, and for each of them:
+ * - Creates a new packet mbuf from the given pool.
+ * - Copy segment to newly created mbuf.
+ * Then updates pkt_len and nb_segs of the new packet mbuf to match values
+ * from the original packet mbuf.
+ *
+ * @param md
+ * The packet mbuf to be copied.
+ * @param mp
+ * The mempool from which the mbufs are allocated.
+ * @return
+ * - The pointer to the new mbuf on success.
+ * - NULL if allocation fails.
+ */
+static inline struct rte_mbuf *rte_pktmbuf_copy(struct rte_mbuf *md,
+ struct rte_mempool *mp)
+{
+ struct rte_mbuf *mc = NULL;
+ struct rte_mbuf **prev = &mc;
+
+ do {
+ struct rte_mbuf *mi;
+
+ mi = rte_pktmbuf_alloc(mp);
+ if (unlikely(mi == NULL)) {
+ rte_pktmbuf_free(mc);
+ return NULL;
+ }
+
+ mi->data_off = md->data_off;
+ mi->data_len = md->data_len;
+ mi->port = md->port;
+ mi->vlan_tci = md->vlan_tci;
+ mi->tx_offload = md->tx_offload;
+ mi->hash = md->hash;
+
+ mi->next = NULL;
+ mi->pkt_len = md->pkt_len;
+ mi->nb_segs = md->nb_segs;
+ mi->ol_flags = md->ol_flags;
+ mi->packet_type = md->packet_type;
+
+ rte_memcpy(rte_pktmbuf_mtod(mi, char *),
+ rte_pktmbuf_mtod(md, char *),
+ md->data_len);
+
+ *prev = mi;
+ prev = &mi->next;
+ } while ((md = md->next) != NULL);
+
+ *prev = NULL;
+ __rte_mbuf_sanity_check(mc, 1);
+ return mc;
+}
+
/**
* Dump an mbuf structure to the console.
*
--
2.1.4
