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+See the :doc:`guidelines document for details of the ABI policy </guidelines/versioning>`.
+API and ABI deprecation notices are to be posted here.
+Help to update from a previous release is provided in
+:doc:`another section </rel_notes/updating_apps>`.
+* Significant ABI changes are planned for struct rte_eth_dev to support up to
+ 1024 queues per port. This change will be in release 2.2.
+ There is no backward compatibility planned from release 2.2.
+ All binaries will need to be rebuilt from release 2.2.
+* The Macros RTE_HASH_BUCKET_ENTRIES_MAX and RTE_HASH_KEY_LENGTH_MAX are
+ deprecated and will be removed with version 2.2.
+* Significant ABI changes are planned for struct rte_mbuf, struct rte_kni_mbuf,
+ and several ``PKT_RX_`` flags will be removed, to support unified packet type
+ from release 2.1. Those changes may be enabled in the upcoming release 2.1
+ with CONFIG_RTE_NEXT_ABI.
+* librte_malloc library has been integrated into librte_eal. The 2.1 release
+ creates a dummy/empty malloc library to fulfill binaries with dynamic linking
+ dependencies on librte_malloc.so. Such dummy library will not be created from
+ release 2.2 so binaries will need to be rebuilt.
+* The following fields have been deprecated in rte_eth_stats:
+ imissed, ibadcrc, ibadlen, imcasts, fdirmatch, fdirmiss,
+ tx_pause_xon, rx_pause_xon, tx_pause_xoff, rx_pause_xoff