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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Maxime Coquelin , Alexandre Torgue , Simon Horman , Russell King , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Furong Xu <0x1207@gmail.com>, Russell King , Serge Semin , Xiaolei Wang , Suraj Jaiswal , Kory Maincent , Gal Pressman , Jesper Nilsson , Choong Yong Liang , Chwee-Lin Choong , Kunihiko Hayashi , Vinicius Costa Gomes , intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, bpf@vger.kernel.org Message-ID: <20250312155245.fdntan3nml424ufe@skbuf> References: <20250309104648.3895551-1-faizal.abdul.rahim@linux.intel.com> <20250309104648.3895551-1-faizal.abdul.rahim@linux.intel.com> <20250309104648.3895551-11-faizal.abdul.rahim@linux.intel.com> <20250309104648.3895551-11-faizal.abdul.rahim@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20250309104648.3895551-11-faizal.abdul.rahim@linux.intel.com> <20250309104648.3895551-11-faizal.abdul.rahim@linux.intel.com> X-ClientProxiedBy: VI1PR02CA0049.eurprd02.prod.outlook.com (2603:10a6:802:14::20) To AM8PR04MB7779.eurprd04.prod.outlook.com (2603:10a6:20b:24b::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM8PR04MB7779:EE_|AM8PR04MB7457:EE_ X-MS-Office365-Filtering-Correlation-Id: fef8725d-811c-4255-50b2-08dd617df0cd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|376014|1800799024; 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a=rsa-sha256; c=relaxed/relaxed; d=nxp.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ov5t6cJSulQvtamNGQtd1mFFPhPtGp8Re9lUEpd8Ans=; b=IRaFzG0HaB+Wa2Dd1aweVOje8a5oNSDZRtLJWfn8fISdeCY1bCF+zCUP+EVMBiMnkRFj2x7Ub0IxNxD3a4+oaa/YShwHXOkFmH8Wn+vq3A+ltQpD3Io0XmfYIbZW2RifmgScBNK5yQaRxkMA9IQkUnNj/5K5LM38l7mECqq3ffpxIqzpaKHyQcZ3EvVq6Q0A5jOpOpB5sjr98LJg3QEFaYUiGhicGEaw6K8oflKyGVMA+zgF4hSH+8aoUFQznpzfHiyqUhX82Mjp/mOtkWQ685FiuS18DZAcTVleUaCubT2dTRLCIh/o95V947HP+L1zXfqxUTajgAIk6TemExeanw== X-Mailman-Original-Authentication-Results: smtp3.osuosl.org; dmarc=pass (p=none dis=none) header.from=nxp.com X-Mailman-Original-Authentication-Results: smtp3.osuosl.org; dkim=pass (2048-bit key, unprotected) header.d=nxp.com header.i=@nxp.com header.a=rsa-sha256 header.s=selector1 header.b=IRaFzG0H X-Mailman-Original-Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nxp.com; Subject: Re: [Intel-wired-lan] [PATCH iwl-next v9 10/14] igc: add support for frame preemption verification X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On Sun, Mar 09, 2025 at 06:46:44AM -0400, Faizal Rahim wrote: > This patch implements the "ethtool --set-mm" callback to trigger the > frame preemption verification handshake. > > Uses the MAC Merge Software Verification (mmsv) mechanism in ethtool > to perform the verification handshake for igc. > The structure fpe.mmsv is set by mmsv in ethtool and should remain > read-only for the driver. > > Other mmsv callbacks: > a) configure_tx() -> not used yet at this point > - igc lacks registers to configure FPE in the transmit direction, so > this API is not utilized for now. When igc supports preemptible queue, > driver will use this API to manage its configuration. > > b) configure_pmac() -> not used > - this callback dynamically controls pmac_enabled at runtime. For > example, mmsv calls configure_pmac() and disables pmac_enabled when > the link partner goes down, even if the user previously enabled it. > The intention is to save power but it is not feasible in igc > because it causes an endless adapter reset loop: > > 1) Board A and Board B complete the verification handshake. Tx mode > register for both boards are in TSN mode. > 2) Board B link goes down. > > On Board A: > 3) mmsv calls configure_pmac() with pmac_enabled = false. > 4) configure_pmac() in igc updates a new field based on pmac_enabled. > Driver uses this field in igc_tsn_new_flags() to indicate that the > user enabled/disabled FPE. > 5) configure_pmac() in igc calls igc_tsn_offload_apply() to check > whether an adapter reset is needed. Calls existing logic in > igc_tsn_will_tx_mode_change() and igc_tsn_new_flags(). > 6) Since pmac_enabled is now disabled and no other TSN feature is > active, igc_tsn_will_tx_mode_change() evaluates to true because Tx > mode will switch from TSN to Legacy. > 7) Driver resets the adapter. > 8) Registers are set, and Tx mode switches to Legacy. > 9) When link partner is up, steps 3–8 repeat, but this time with > pmac_enabled = true, reactivating TSN. > igc_tsn_will_tx_mode_change() evaluates to true again, since Tx > mode will switch from Legacy to TSN. > 10) Driver resets the adapter. > 11) Adapter reset completes, registers are set, and Tx mode switches to > TSN. > > On Board B: > 12) Adapter reset on Board A at step 10 causes it to detect its link > partner as down. > 13) Repeats steps 3–8. > 14) Once reset adapter on Board A is completed at step 11, it detects > its link partner as up. > 15) Repeats steps 9–11. > > - this cycle repeats indefinitely. To avoid this issue, igc only uses > mmsv.pmac_enabled to track whether FPE is enabled or disabled. > > Co-developed-by: Vinicius Costa Gomes > Signed-off-by: Vinicius Costa Gomes > Co-developed-by: Choong Yong Liang > Signed-off-by: Choong Yong Liang > Co-developed-by: Chwee-Lin Choong > Signed-off-by: Chwee-Lin Choong > Signed-off-by: Faizal Rahim > --- Reviewed-by: Vladimir Oltean