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From: Ouyang Changchun <changchun.ouyang@intel.com>
To: dev@dpdk.org
Date: Fri, 24 Oct 2014 16:10:07 +0800
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Subject: [dpdk-dev] [PATCH 1/3] mbuf: Use EXTERNAL_MBUF to indicate external
buffer
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mbuf uses EXTERNAL_MBUF in ol_flags to indicate it is an
external buffer, when freeing such kind of mbuf, just need put mbuf itself
back into mempool, doesn't free the attached external buffer, user/caller
need take care of detaching and freeing the external buffer.
Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com>
---
lib/librte_mbuf/rte_mbuf.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index ddadc21..8cee8fa 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -114,6 +114,9 @@ extern "C" {
/* Bit 51 - IEEE1588*/
#define PKT_TX_IEEE1588_TMST (1ULL << 51) /**< TX IEEE1588 packet to timestamp. */
+/* Bit 62 - Indicate it is external buffer */
+#define EXTERNAL_MBUF (1ULL << 62) /**< External buffer. */
+
/* Use final bit of flags to indicate a control mbuf */
#define CTRL_MBUF_FLAG (1ULL << 63) /**< Mbuf contains control data */
@@ -670,7 +673,7 @@ __rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
* - detach mbuf
* - free attached mbuf segment
*/
- if (unlikely (md != m)) {
+ if (unlikely((md != m) && !(m->ol_flags & EXTERNAL_MBUF))) {
rte_pktmbuf_detach(m);
if (rte_mbuf_refcnt_update(md, -1) == 0)
__rte_mbuf_raw_free(md);
--
1.8.4.2