[RFC 6/8] doc: announce legacy flow director deprecation

[Stephen Hemminger <stephen@networkplumber.org>]

Add the formal deprecation notice for the legacy flow director API
and the matching 26.07 release note.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 doc/guides/rel_notes/deprecation.rst   |  7 +++++++
 doc/guides/rel_notes/release_26_07.rst | 14 ++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
index d152e76fdc..5e2949d153 100644
--- a/doc/guides/rel_notes/deprecation.rst
+++ b/doc/guides/rel_notes/deprecation.rst
@@ -131,6 +131,13 @@ Deprecation Notices
   The legacy actions should be removed
   once ``MODIFY_FIELD`` alternative is implemented in drivers.
 
+* ethdev: Legacy flow director API will be removed in DPDK 26.11.
+  This affects: flow director data structures in ``rte_eth_ctrl.h``
+  (``rte_eth_fdir_*`` and ``rte_fdir_*`` types and the associated
+  ``RTE_ETH_FDIR_*`` / ``RTE_FDIR_*`` macros) and the driver-facing
+  definitions in ``ethdev_driver.h`` (``struct rte_eth_fdir_conf``,
+  ``enum rte_eth_fdir_pballoc_type``, ``enum rte_fdir_status_mode``).
+
 * cryptodev: Support for OpenSSL versions earlier than 3.0 is deprecated
   and will be removed. OpenSSL 1.1.1 reached end-of-life in September 2023.
   The minimum supported OpenSSL version will be 3.0,
diff --git a/doc/guides/rel_notes/release_26_07.rst b/doc/guides/rel_notes/release_26_07.rst
index 8b4f8401e2..06689cdcca 100644
--- a/doc/guides/rel_notes/release_26_07.rst
+++ b/doc/guides/rel_notes/release_26_07.rst
@@ -100,6 +100,18 @@ Removed Items
    Also, make sure to start the actual text at the margin.
    =======================================================
 
+* Removed legacy flow director artifacts that depended on deprecated API.
+  Users should use ``rte_flow`` API and testpmd ``flow``
+  command instead.
+
+  * app/testpmd: ``show port fdir``, ``clear port fdir``,
+    ``flow_director_filter``, ``port config ... pctype mapping ...``,
+    and ``port config ... hash_inset|fdir_inset|fdir_flx_inset ...``.
+
+  * net/i40e, net/ixgbe: the experimental
+    ``rte_pmd_{i40e,ixgbe}_get_fdir_info()`` and
+    ``rte_pmd_{i40e,ixgbe}_get_fdir_stats()`` functions.
+
 
 API Changes
 -----------
@@ -116,6 +128,8 @@ API Changes
    Also, make sure to start the actual text at the margin.
    =======================================================
 
+* Deprecated the legacy flow director API; removal scheduled for
+  DPDK 26.11. Use the ``rte_flow`` API instead.
 
 ABI Changes
 -----------
-- 
2.53.0