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[dpdk-dev,v2,2/2] doc: updating from 1.7 to 1.8 release note

Message ID 1418917727-22921-3-git-send-email-pablo.de.lara.guarch@intel.com (mailing list archive)
State Accepted, archived
Headers show

Commit Message

De Lara Guarch, Pablo Dec. 18, 2014, 3:48 p.m. UTC
From: Siobhan Butler <siobhan.a.butler@intel.com>

Added instructions for updating from DPDK 1.7.0 to 1.8.0

Signed-off-by: Siobhan Butler <siobhan.a.butler@intel.com>

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 doc/guides/rel_notes/updating_apps.rst | 13 +++++++++++++
 1 file changed, 13 insertions(+)
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Patch

diff --git a/doc/guides/rel_notes/updating_apps.rst b/doc/guides/rel_notes/updating_apps.rst
index 034554d..4dbf268 100644
--- a/doc/guides/rel_notes/updating_apps.rst
+++ b/doc/guides/rel_notes/updating_apps.rst
@@ -7,6 +7,19 @@  may require some code updates to benefit from performance and user experience en
 DPDK 1.7 to DPDK 1.8
 --------------------
 
+Note that in DPDK 1.8, the structure of the rte_mbuf has changed considerably from all previous versions.
+It is recommended that users familiarize themselves with the new structure defined in the file rte_mbuf.h in the release package.
+The follow are some common changes that need to be made to code using mbufs, following an update to DPDK 1.8:
+
+*   Any references to fields in the pkt or ctrl sub-structures of the mbuf, need to be replaced with references to the field
+    directly from the rte_mbuf, i.e. buf->pkt.data_len should be replace by buf->data_len.
+
+*   Any direct references to the data field of the mbuf (original buf->pkt.data) should now be replace by the macro rte_pktmbuf_mtod
+    to get a computed data address inside the mbuf buffer area.
+
+*   Any references to the in_port mbuf field should be replace by references to the port field.
+
+NOTE: The above list is not exhaustive, but only includes the most commonly required changes to code using mbufs.
 
 IntelĀ® DPDK 1.6 to DPDK 1.7
 ---------------------------