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Fri, 18 Jul 2025 15:19:10 +0000 Date: Fri, 18 Jul 2025 16:19:04 +0100 From: Bruce Richardson To: Kevin Traynor CC: Ciara Loftus , Subject: Re: [PATCH v2] net/intel: deprecate some SSE paths Message-ID: References: <20250703121624.1050845-1-ciara.loftus@intel.com> <20250703143119.1140097-1-ciara.loftus@intel.com> <0c964d09-7b83-4367-b6cf-6cc05bd64967@redhat.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <0c964d09-7b83-4367-b6cf-6cc05bd64967@redhat.com> X-ClientProxiedBy: DUZPR01CA0092.eurprd01.prod.exchangelabs.com (2603:10a6:10:4bb::27) To DS0PR11MB7309.namprd11.prod.outlook.com (2603:10b6:8:13e::17) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB7309:EE_|IA0PR11MB7935:EE_ X-MS-Office365-Filtering-Correlation-Id: 99f5ad90-6ffa-4092-48eb-08ddc60e71f4 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?I/s/5qFhY5523OiQc74WpyyI9uB1TNOhnM+qrFrZPhBfBqZqUf/2KkMLhh+h?= =?us-ascii?Q?5d9oahQxW04AgMVi/RF+PhL9MQqMjrCYOfxOQLP8Agi9g2eY6vrU1AtI9jQv?= =?us-ascii?Q?dYl1nF6Q2eIZGHPzER5zh+Ulqei/iFuKw5aTZvm5zn3SnCagnI985HRZG+0k?= =?us-ascii?Q?7w+3RNTbw/F3Bbov9lI1oKCTwZ9T49V4t3bx88IE0dU00BUuVR23dmmRQkiv?= =?us-ascii?Q?8vYTMg+1g/V5yAeIzaMonr+zW43G3ujNShxctSchJak1exNS1RJcr8GAae/u?= =?us-ascii?Q?80n1ggIUbIQMgUiKtxtTZyZh5e7HAM/4fwM8u/aZw3NI2M1BK3gmGem25ShD?= =?us-ascii?Q?+8BUciWZPBxzP7Oh2elj/jDRRH9YmkRlAgf243kj06301YjP0Z2e37YaTtbb?= =?us-ascii?Q?tTRP2ht/Ix2/Qo6c4eLc+cfzy7PittEsNi5y2IFV1g0rMMNoYnE0kJ/S5KOT?= =?us-ascii?Q?ZyHfV7nK2YSEzjQYvRdaYcX/tCrHjOUmYnDR2y1sNy6TPrWBd4ywm2ZrJvg/?= =?us-ascii?Q?VYhseJSBEVwRoK7Q8wEsGPzFALBSDJhtGhDnlp0wtj/ABVIGmc2rqrppOxbr?= =?us-ascii?Q?QdTuDbAgRTG9pjXN56iAiQWPxASOp5IxO8urbXWTKB+9XrDtE4P+IueI6t06?= =?us-ascii?Q?kQX6ScPJ2o+1zNBlVzqaY8LRpUcSrYpxAeHw8jbJtzjTvmI5EB6o5bEPnjn4?= =?us-ascii?Q?kKd/KpTaMwrYSqDx9g69qZeBwsOw5CISbjcmVY1YikokuR/MEuS4D9rYIj8R?= =?us-ascii?Q?sDI783n+ZSlqkwQT24eelBh195m50zNK/niKdbXA4qvLIhH50vGgWewB5vGQ?= =?us-ascii?Q?1gXrUrpSA+iXWhVDJ0wQlzECPptKNoihhaIMSlWbTaxkSBovSG0huOGXX3X4?= =?us-ascii?Q?0kUzR9jqA33cGzvHs14uxkMxNzyr62Kqfm/4LiB2J5BWOCJ4MZPTMgWkWFE9?= =?us-ascii?Q?aqPo1/qGjl9SOE2k/5Xj/uAJJ4AyDJd/MTm1YolgCPOuN/Ez0WNEZ0B/lA0A?= =?us-ascii?Q?frgDWKTUVocg2OqncK/Jw5cPspq6a593/2G+uhnAtZArG+kLkTDlQl43f6vB?= =?us-ascii?Q?0i4dkmLDbCLMxZ4S+dvMdweKhLBOEh42geD3zLZEK/TThXAFdCPonol5mIyc?= =?us-ascii?Q?qfqNcsfQenbeFPNCErzshJtKHP3zMoRM8XrlbtehmtyrWDkFrx/in0e+mM7M?= =?us-ascii?Q?t40UvCKg9ckPxOhTXjNLqBO/c/NW30sLwbAhfQUGYtGO55yUZ7HrRjwU2Hr6?= =?us-ascii?Q?ZkiMbPoa8eorlYv+lWDKTKuu9ySl3QejhI5oJluZHZFysPnrdRfaY5HJ0x1D?= =?us-ascii?Q?vg0P652NuPT7yGMO91iOHN9WvcIBzenVONTNVLbDWzLqCO4VlwnxwRNOLlvL?= =?us-ascii?Q?ri0QbYFhdFSdv4+px/b0wPNgWketDyU3rl3mp+Rqh8hTPlUgcRG6dpCAotDL?= =?us-ascii?Q?ef8J8Z29O94=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255; 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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 > > --- > > 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 > > I'm not aware of anyone using hardware that old and relying on SSE, but > it seems a bit short notice for a patch to remove hardware support. > > Would it hurt much to give it a longer deprecation so anyone who needs > to prepare by upgrade, or taking 25.11 with support etc. can do that ? > Do we think that will make a difference? After all, dropping the SSE path won't break DPDK on older hardware, it will only run a bit slower using the scalar path. Beyond that, it would only affect deployments with new/latest DPDK on old hardware - obviously old hardware running older DPDK would be unaffected. /Bruce