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Wed, 12 Nov 2025 17:04:27 +0000 Date: Wed, 12 Nov 2025 17:04:22 +0000 From: Bruce Richardson To: Anatoly Burakov CC: , Subject: Re: [PATCH v2 1/1] doc/ice: document protocol agnostic filtering Message-ID: References: <5d6aa3eed2827e1f7c8e07c1e344e232f010f0e4.1762947241.git.anatoly.burakov@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <5d6aa3eed2827e1f7c8e07c1e344e232f010f0e4.1762947241.git.anatoly.burakov@intel.com> X-ClientProxiedBy: DB8PR06CA0065.eurprd06.prod.outlook.com (2603:10a6:10:120::39) To DS0PR11MB7309.namprd11.prod.outlook.com (2603:10b6:8:13e::17) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB7309:EE_|CO1PR11MB4945:EE_ X-MS-Office365-Filtering-Correlation-Id: 246308bf-40ee-4700-97cf-08de220d895b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?bG7DKKPCcCUxfb9mKxM4s8KcUZ19IwSRXFF59Q0F9RHDvnN3TysFbAKIzHs1?= =?us-ascii?Q?YXwR8VNq8x+JyTaV5VGh1R5L8obJLbpN2EGYYaT81GD5/eH2ZHJ/x6+TWAZx?= =?us-ascii?Q?8CtqhdBC9EzRG4xd1nv0UJ1Gm/VK+ZAQ/1RKVjef8WhM5UwyHQ8oVZrOZLuH?= =?us-ascii?Q?WlMmm+hUf4792LVWT38sWpQeBFRmn5aGv3S5HRMwhbDxWJbmAvBnE7zhZUcp?= =?us-ascii?Q?3FvN+dfHuvALvHQ8rLr/57ezJp571AdWPoDV5TIigePrm03ZPQT3ZzVDIWUm?= =?us-ascii?Q?YV4vYuPVkcw/8Rh8/r2hMjU25Ock75ZUElm+lWT1966ZXg2nM1g8X+gnQtbo?= =?us-ascii?Q?KFW2dyHxvyE7bfi/ApJag939qicWYhIHcivrJo1q+9aF2xFvNFqfvhRx6izp?= =?us-ascii?Q?xjLs+fJbZO/NlwRsRgTjRHyIcIGHi9w+HBVHtNBN3OFGlsh3r+1hdPxa5oad?= =?us-ascii?Q?DCuGZgxUkaJrQ7DpvSTtNs9mqZWZc1pSLlwpcF/gCWej3EHApoU+8A53CFPx?= =?us-ascii?Q?pp2o5IagWedaqt9qWp2cv8g5o/sx0IgLA+jG2lU3fY/tdr5L6Ic2WAQqNgak?= =?us-ascii?Q?xbN5adMAK6HDydER+4mKDZvYmv3WJmxuj0ChuO+IFmygnobz5nJC0oqpHl3Q?= =?us-ascii?Q?Uh6S5YOeOstzdHLnlAwZoz4/l7TTQ6qKnnfrOxQM+Hjo9piYomdKZ9gvzR/1?= =?us-ascii?Q?PWf+6ts47//bOkU1nXtLCOOHiZpH5ZTO2fAUu37vSg6bc9lscmuLeFOBwQZd?= =?us-ascii?Q?8i1M+WXvViohrKsI8ljyHZPbQ27vGvUeSU+xOKXC24hSDHtUupuM4H6ftpjI?= =?us-ascii?Q?GXrJ/hC0F54a+SQZSHbXvW6mI7uEjsee4ualKdU/qsXV6OuUJX/bsg85k5TV?= =?us-ascii?Q?1N8MJcyjFFbVT1hAxIu9znV7r8dvhAVRwYBhRZUg9qYqrHiSvtypSwEbwFSn?= =?us-ascii?Q?+U49aRKjSyBBgTBwYznFMM71OY6DjF5/IqbpaESxM5hq2ElMlKUvFz240C7e?= =?us-ascii?Q?J5nGWchDW7i37gYwdxOkiLWPPdSasvbzNTEDXhnXYbxV3L2DvDj3SkP79Dye?= =?us-ascii?Q?wHI5sBCCn1+umE8qV4Ib6JhHAPpNJ3n6WAvAyYfLQbP6zqIF7vFtHi0bkTq6?= =?us-ascii?Q?1QZ+sUVq0jMwbXFOeJFWgUKowy5W8VyuQf5p7BGk1aeFz5e42UYHypLGhvbS?= =?us-ascii?Q?OTgLafU0OxfwDBQXhtCfmHO4/l2nxlbUkzmBd6d2fcV4LHt2eYAziYxZfwmP?= =?us-ascii?Q?uZqdh0fRkj7AbHZmgLgHXfHKbQ0bG0Kl9pgdTDiqHsGKLy/7GqR9Uih6ZIgz?= =?us-ascii?Q?NHvaH1fjFue9SO7MZxwk88gymMIdrW+wCBAbjEQD5oyLqv/La0stZHOJjJrE?= =?us-ascii?Q?fQ8HbFeLDO2oiRPi5/R9EqNhVX68UPK8JVxapDsN2Ds/QCKqZwHfHAU+BLGO?= =?us-ascii?Q?dSDcCe/N30QLQCp2XEB3XAJyEO9WgypvfyMv81DnbFoV85hCD9O3lw=3D=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255; 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Document the feature > better and make all of the assumptions explicit. > > Signed-off-by: Anatoly Burakov > Acked-by: Vladimir Medvedkin > --- > > Notes: > v2: > - Reformat lines to have complete sentences per line > - Added C implementation for testpmd examples > - Added link to packetforge script > > doc/guides/nics/ice.rst | 222 ++++++++++++++++++++++++++++++++++++++-- > 1 file changed, 211 insertions(+), 11 deletions(-) > > diff --git a/doc/guides/nics/ice.rst b/doc/guides/nics/ice.rst > index 6cc27cefa7..ffa11cf066 100644 > --- a/doc/guides/nics/ice.rst > +++ b/doc/guides/nics/ice.rst > @@ -624,20 +624,220 @@ For each engine, a list of supported patterns is maintained in a global array > named ``ice__supported_pattern``. The Ice PMD will reject any rule with > a pattern that is not included in the supported list. > > -One notable feature is the ice PMD's ability to leverage the Raw pattern, > -enabling protocol-agnostic flow offloading. Here is an example of creating > -a rule that matches an IPv4 destination address of 1.2.3.4 and redirects it to > -queue 3 using a raw pattern:: > - > - flow create 0 ingress group 2 pattern raw \ > - pattern spec \ > - 00000000000000000000000008004500001400004000401000000000000001020304 \ > - pattern mask \ > - 000000000000000000000000000000000000000000000000000000000000ffffffff \ > - end actions queue index 3 / mark id 3 / end > +Protocol Agnostic Filtering > +~~~~~~~~~~~~~~~~~~~~~~~~~~~ > + > +One notable feature is the ice PMD's ability to leverage the Raw pattern, enabling protocol-agnostic flow offloading. > +This feature allows users to create flow rules for any protocol recognized by the hardware parser, by manually specifying the raw packet structure. > +Therefore, flow offloading can be used even in cases where desired protocol isn't explicitly supported by RTE_FLOW interface. > + > +Raw Pattern Components > +++++++++++++++++++++++ > + > +Raw patterns consist of two key components: > + > +**Pattern Spec** > + An ASCII hexadecimal string representing the complete packet structure that defines the packet type and protocol layout. > + The hardware parser analyzes this structure to determine the packet type (PTYPE) and identify protocol headers and their offsets. > + This specification must represent a valid packet structure that the hardware can parse and classify. > + If the hardware parser does not support a particular protocol stack, it may not correctly identify the packet type. > + > +**Pattern Mask** > + An ASCII hexadecimal string of the same length as the spec that determines which specific fields within the packet will be extracted and used for matching. > + The mask control field extraction without affecting the packet type identification. > + > +.. note:: > + Raw pattern must be the only flow item in the flow item list. > + > +Generating Raw Pattern Values > ++++++++++++++++++++++++++++++ > + > +To create raw patterns, follow these steps: > + > +1. **Verify parser support**: Confirm that the hardware parser supports the protocol combination needed for the intended flow rule. > + This can be checked against the documentation for the DDP package currently in use. > + > +2. **Build the packet template**: Create a complete, valid packet header with all necessary sections (Ethernet, IP, UDP/TCP, etc.) using the exact field values that need to be matched. > + > +3. **Convert to hexadecimal**: Transform the entire header into a continuous ASCII hexadecimal string, with each byte represented as two hex characters. > + > +4. **Create the extraction mask**: Generate a mask of the same length as the spec, where set bits would indicate the fields used for extraction/matching. > + > +VPP project's `flow_parse.py` script can be used to generate packet templates and masks for raw patterns. > +This tool takes a human-readable flow description and outputs the corresponding ASCII hexadecimal spec and mask. > +This script can be found under ``extras/packetforge`` in `VPP project `_. > + > +Example usage: > + > +.. code-block:: console > + > + python3 flow_parse.py --show -p "mac()/ipv4(src=1.1.1.1,dst=2.2.2.2)/udp()" > + > +Output: > + > + {'flow': {'generic': {'pattern': {'spec': b'00000000000100000000000208004500001c000000000011000001010101020202020000000000080000', > + 'mask': b'0000000000000000000000000000000000000000000000000000ffffffffffffffff0000000000000000'}}}} > + This looks like it should have a code-block tag on it too. Was that a deliberate omission? If it should be there, I'll add it on apply. > +.. note:: > + Ensure the spec represents complete protocol headers, as the hardware parser processes fields at 16-bit boundaries. > + Incomplete or truncated headers may result in unpredictable field extraction behavior. > + > +Action Support and Usage > +^^^^^^^^^^^^^^^^^^^^^^^^ > + > +After constructing the raw pattern spec and mask, they can be used in the flow API with pattern type "raw". > + > +The following is an example of a minimal Ethernet + IPv4 header template. > +Source and destination IPv4 addresses are part of the match key; all other fields are ignored. > + > +Spec (packet template): > + 000000000001 Destination MAC (6 bytes) > + 000000000002 Source MAC (6 bytes) > + 0800 EtherType = IPv4 > + 4500001c0000000000110000 IPv4 header, protocol = UDP > + 01010101 Source IP = 1.1.1.1 > + 02020202 Destination IP = 2.2.2.2 > + 0000000000080000 UDP header > + The format of the output in the HTML here is not as above. Again, should this have a code-block tag on it? > +Mask: > + 000000000000 Destination MAC (ignored) > + 000000000000 Source MAC (ignored) > + 0000 EtherType (ignored) > + 000000000000000000000000 IPv4/UDP header (ignored) > + ffffffff Source IP (match all 32 bits) > + ffffffff Destination IP (match all 32 bits) > + 0000000000000000 UDP header (ignored) > +