[PATCH v2] net/intel: deprecate some SSE paths

[Ciara Loftus <ciara.loftus@intel.com>]

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 <ciara.loftus@intel.com>
---
 doc/guides/rel_notes/deprecation.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
index e2d4125308..0d020c9c1f 100644
--- a/doc/guides/rel_notes/deprecation.rst
+++ b/doc/guides/rel_notes/deprecation.rst
@@ -80,6 +80,13 @@ Deprecation Notices
   and the header struct ``rte_vxlan_gpe_hdr`` with the macro ``RTE_ETHER_VXLAN_GPE_HLEN``
   will be removed in DPDK 25.11.
 
+* 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.
+
 * ethdev: The flow API matching pattern structures, ``struct rte_flow_item_*``,
   should start with relevant protocol header structure from lib/net/.
   The individual protocol header fields and the protocol header struct
-- 
2.34.1