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Miller" , "netdev@vger.kernel.org" , Po Liu CC: Alexandru Marginean , Rob Herring , Shawn Guo , "linux-arm-kernel@lists.infradead.org" , "devicetree@vger.kernel.org" , Russell King - ARM Linux admin , Andrew Lunn , Michael Walle , Vladimir Oltean Subject: RE: [PATCH net-next 5/5] net: enetc: add support for flow control Thread-Topic: [PATCH net-next 5/5] net: enetc: add support for flow control Thread-Index: AQHXMxpZEYIxiwunrU26djqgH5Ni/Kq7kFUg Date: Mon, 19 Apr 2021 09:07:23 +0000 Message-ID: References: <20210416234225.3715819-1-olteanv@gmail.com> <20210416234225.3715819-6-olteanv@gmail.com> In-Reply-To: <20210416234225.3715819-6-olteanv@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=nxp.com; x-originating-ip: [188.25.217.66] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 79b64bdc-6167-42e0-d9ed-08d903128b91 x-ms-traffictypediagnostic: AM0PR0402MB3331: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:7219; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org >-----Original Message----- >From: Vladimir Oltean >Sent: Saturday, April 17, 2021 2:42 AM >To: Jakub Kicinski ; David S. Miller >; netdev@vger.kernel.org; Po Liu > >Cc: Claudiu Manoil ; Alexandru Marginean >; Rob Herring ; >Shawn Guo ; linux-arm-kernel@lists.infradead.org; >devicetree@vger.kernel.org; Russell King - ARM Linux admin >; Andrew Lunn ; Michael Walle >; Vladimir Oltean >Subject: [PATCH net-next 5/5] net: enetc: add support for flow control > >From: Vladimir Oltean > >In the ENETC receive path, a frame received by the MAC is first stored >in a 256KB 'FIFO' memory, then transferred to DRAM when enqueuing it to >the RX ring. The FIFO is a shared resource for all ENETC ports, but >every port keeps track of its own memory utilization, on RX and on TX. > >There is a setting for RX rings through which they can either operate in >'lossy' mode (where the lack of a free buffer causes an immediate >discard of the frame) or in 'lossless' mode (where the lack of a free >buffer in the ring makes the frame stay longer in the FIFO). > >In turn, when the memory utilization of the FIFO exceeds a certain >margin, the MAC can be configured to emit PAUSE frames. > >There is enough FIFO memory to buffer up to 3 MTU-sized frames per RX >port while not jeopardizing the other use cases (jumbo frames), and >also not consume bytes from the port TX allocations. Also, 3 MTU-sized >frames worth of memory is enough to ensure zero loss for 64 byte packets >at 1G line rate. > >Signed-off-by: Vladimir Oltean Reviewed-by: Claudiu Manoil _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel