This patch adds function rte_pktmbuf_linearize to let crypto PMD coalesce
chained mbuf before crypto operation and extend their capabilities to
support segmented mbufs when device cannot handle them natively.
Signed-off-by: Tomasz Kulasek <tomaszx.kula...@intel.com>
---
lib/librte_mbuf/rte_mbuf.h | 56 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 56 insertions(+)
diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index ead7c6e..b11a31d 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -1647,6 +1647,62 @@ static inline int rte_pktmbuf_chain(struct rte_mbuf
*head, struct rte_mbuf *tail
}
/**
+ * Linearize data in mbuf.
+ *
+ * This function coalesce mbuf merging data in the first segment, unchaining
+ * rest, and then frees them.
+ *
+ * All operations are done in-place, so the structure of incoming mbuf
+ * is changed.
+ *
+ * @param mbuf
+ * mbuf to linearize
+ * @return
+ * - 0, on success
+ * - -1, on error
+ */
+static inline int
+rte_pktmbuf_linearize(struct rte_mbuf *mbuf)
+{
+ int l, n;
+ struct rte_mbuf *m;
+ struct rte_mbuf *m_next;
+ char *buffer;
+
+ if (rte_pktmbuf_is_contiguous(mbuf))
+ return 0;
+
+ /* Extend first segment to the total packet length
+ */
+ n = rte_pktmbuf_pkt_len(mbuf) - rte_pktmbuf_data_len(mbuf);
+
+ if (unlikely(n > rte_pktmbuf_tailroom(mbuf)))
+ return -1;
+
+ buffer = rte_pktmbuf_mtod_offset(mbuf, char *, mbuf->data_len);
+ mbuf->data_len = (uint16_t)(mbuf->pkt_len);
+
+ /* Append data from next segments to the first one
+ */
+ m = mbuf->next;
+ while (m != NULL) {
+ m_next = m->next;
+
+ l = rte_pktmbuf_data_len(m);
+ rte_memcpy(buffer, rte_pktmbuf_mtod(m, char *), l);
+ buffer += l;
+
+ rte_pktmbuf_free_seg(m);
+ m = m_next;
+ }
+
+ mbuf->next = NULL;
+ mbuf->nb_segs = 1;
+
+ return 0;
+}
+
+/**
* Dump an mbuf structure to a file.
*
* Dump all fields for the given packet mbuf and all its associated
--
1.7.9.5
