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Miller" , Jakub Kicinski , Paolo Abeni , Eric Dumazet , Andrew Lunn , Simon Horman Cc: saeedm@nvidia.com, gal@nvidia.com, leonro@nvidia.com, tariqt@nvidia.com, Leon Romanovsky , netdev@vger.kernel.org, linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, moshe@nvidia.com References: <20250622172226.4174-1-mbloch@nvidia.com> <8ed873ce-619d-4bdd-8fba-222320229efe@linux.dev> Content-Language: en-US From: Mark Bloch In-Reply-To: <8ed873ce-619d-4bdd-8fba-222320229efe@linux.dev> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: TL2P290CA0019.ISRP290.PROD.OUTLOOK.COM (2603:1096:950:3::14) To CH3PR12MB7548.namprd12.prod.outlook.com (2603:10b6:610:144::12) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PR12MB7548:EE_|PH8PR12MB6867:EE_ X-MS-Office365-Filtering-Correlation-Id: 5cc31bdc-dd18-4751-75bc-08ddb24e0a8a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|7416014|1800799024; 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I googled this ICM. And I got the following > > " > ICM stands for Internal Context Memory, a specialized memory region used by Mellanox/NVIDIA network devices (e.g., ConnectX series NICs) to store hardware context and rule tables for offloaded operations like flow steering, filtering, and traffic redirection. > > ICM is crucial when using hardware steering (HWS), where the NIC itself performs packet matching and forwarding without involving the host CPU. > " Broadly speaking, yes. You can also check its consumption via devlink health reporter. https://docs.kernel.org/networking/devlink/mlx5.html check out icm_consumption on the above page. Mark > If I am missing something, please correct me. > > Zhu Yanjun > >> >> Hardware steering (HWS) uses a type of rule table container (RTC) that >> is unidirectional, so matchers consist of two RTCs to accommodate >> bidirectional rules. >> >> This small series enables resizing the two RTCs independently by >> tracking the number of rules separately. For extreme cases where all >> rules are unidirectional, this results in saving close to half the >> memory footprint. >> >> Results for inserting 1M unidirectional rules using a simple module: >> >>             Pages        Memory >> Before this patch:    300k        1.5GiB >> After this patch:    160k        900MiB >> >> The 'Pages' column measures the number of 4KiB pages the device requests >> for itself (the ICM). >> >> The 'Memory' column is the difference between peak usage and baseline >> usage (before starting the test) as reported by `free -h`. >> >> In addition, second to last patch of the series handles a case where all >> the matcher's rules were deleted: the large RTCs of the matcher are no >> longer required, and we can save some more ICM by shrinking the matcher >> to its initial size. >> >> Finally the last patch makes hardware steering the default mode >> when in swichdev for NICs that don't have software steering support. >> >> Changelog >> ========= >> Changes from v1 [0]: >> - Fixed author on patches 5 and 6. >> >> References >> ========== >> [0] v1: https://lore.kernel.org/all/20250619115522.68469-1-mbloch@nvidia.com/ >> >> Moshe Shemesh (1): >>    net/mlx5: Add HWS as secondary steering mode >> >> Vlad Dogaru (5): >>    net/mlx5: HWS, remove unused create_dest_array parameter >>    net/mlx5: HWS, Refactor and export rule skip logic >>    net/mlx5: HWS, Create STEs directly from matcher >>    net/mlx5: HWS, Decouple matcher RX and TX sizes >>    net/mlx5: HWS, Track matcher sizes individually >> >> Yevgeny Kliteynik (2): >>    net/mlx5: HWS, remove incorrect comment >>    net/mlx5: HWS, Shrink empty matchers >> >>   .../net/ethernet/mellanox/mlx5/core/fs_core.c |   2 + >>   .../mellanox/mlx5/core/steering/hws/action.c  |   7 +- >>   .../mellanox/mlx5/core/steering/hws/bwc.c     | 284 ++++++++++++++---- >>   .../mellanox/mlx5/core/steering/hws/bwc.h     |  14 +- >>   .../mellanox/mlx5/core/steering/hws/debug.c   |  20 +- >>   .../mellanox/mlx5/core/steering/hws/fs_hws.c  |  15 +- >>   .../mellanox/mlx5/core/steering/hws/matcher.c | 166 ++++++---- >>   .../mellanox/mlx5/core/steering/hws/matcher.h |   3 +- >>   .../mellanox/mlx5/core/steering/hws/mlx5hws.h |  36 ++- >>   .../mellanox/mlx5/core/steering/hws/rule.c    |  35 +-- >>   .../mellanox/mlx5/core/steering/hws/rule.h    |   3 + >>   11 files changed, 403 insertions(+), 182 deletions(-) >> >> >> base-commit: 091d019adce033118776ef93b50a268f715ae8f6 > >