doc: announce removal of SSE paths in some Intel drivers

The SSE Rx and Tx paths will be removed from the i40e, iavf and ice
drivers in the 25.11 release. Each of these drivers have faster vector
paths (AVX2 and AVX-512) which have feature parity with the soon to be
removed SSE paths. In environments where AVX2 or AVX-512 are not
supported, the scalar path will still be used, which also has feature
parity.

Signed-off-by: Ciara Loftus <[email protected]>
Acked-by: Bruce Richardson <[email protected]>
Acked-by: Konstantin Ananyev <[email protected]>
Acked-by: Kevin Traynor <[email protected]>

Author: cloftus

doc/guides/rel_notes/deprecation.rst

@@ -153,6 +153,14 @@ Deprecation Notices
   ``drivers/bus/vmbus/rte_bus_vmbus.h`` will become internal to DPDK.
   Those API functions are used internally by DPDK core and netvsc PMD.
 
+* net/intel: Drivers that have an SSE vector path alongside other vector paths,
+  namely i40e, iavf and ice, will have their SSE vector paths removed in DPDK 25.11.
+  Modern x86 systems all support AVX2, if not AVX-512,
+  so the SSE path is no longer widely used.
+  This change will not result in any feature loss,
+  as the fallback scalar paths which have feature parity with SSE
+  will be used in the cases where the SSE paths would have been used.
+
 * net/mlx5: ``repr_matching_en`` device argument is deprecated
   and will be removed in DPDK 25.11 release.
   With disabled representor matching, behavior of Rx datapath in mlx5 PMD