[PATCH v3] doc: announce rte_ipsec API changes

[Aakash Sasidharan <asasidharan@marvell.com>]

In case of event mode operations where event device can help in atomic
sequence number increment across cores, sequence number need to be
provided by the application instead of being updated in rte_ipsec or the
PMD.

To support this, two new APIs rte_ipsec_pkt_crypto_sqn_assign and
rte_ipsec_pkt_crypto_xprepare are introduced decoupling the seq no update
functionality from the existing rte_ipsec_pkt_crypto_prepare API.
Additionally, a new flag ``RTE_IPSEC_SAFLAG_SQN_ASSIGN_DISABLE`` will be
added to allow disabling of internal sequence number update inside IPsec
library.

Signed-off-by: Aakash Sasidharan <asasidharan@marvell.com>
---
 doc/guides/rel_notes/deprecation.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
index 6948641ff6..9be7b90b94 100644
--- a/doc/guides/rel_notes/deprecation.rst
+++ b/doc/guides/rel_notes/deprecation.rst
@@ -133,6 +133,14 @@ Deprecation Notices
   Since these functions are not called directly by the application,
   the API remains unaffected.
 
+* ipsec: The rte_ipsec library is updated to support sequence number provided
+  by application. To allow the same, two new APIs are being introduced:
+  rte_ipsec_pkt_crypto_sqn_assign and rte_ipsec_pkt_crypto_xprepare. These APIs
+  separate the seq no update functionality from the existing rte_ipsec_pkt_crypto_prepare
+  API. Corresponding configure structure changes are being made for the new APIs.
+  Additionally a new flag ``RTE_IPSEC_SAFLAG_SQN_ASSIGN_DISABLE`` is
+  introduced to disable sequence number assignment in lib IPsec.
+
 * pipeline: The pipeline library legacy API (functions rte_pipeline_*)
   will be deprecated and subsequently removed in DPDK 24.11 release.
   Before this, the new pipeline library API (functions rte_swx_pipeline_*)
-- 
2.25.1