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Mon, 28 Oct 2019 21:07:11 +0000 From: Haiyang Zhang To: "sashal@kernel.org" , "linux-hyperv@vger.kernel.org" , "netdev@vger.kernel.org" CC: Haiyang Zhang , KY Srinivasan , Stephen Hemminger , "olaf@aepfle.de" , vkuznets , "davem@davemloft.net" , "linux-kernel@vger.kernel.org" Subject: [PATCH net-next, 4/4] hv_netvsc: Update document for XDP support Thread-Topic: [PATCH net-next, 4/4] hv_netvsc: Update document for XDP support Thread-Index: AQHVjdOqeF2skKD6Y0io1FAqZWRRAw== Date: Mon, 28 Oct 2019 21:07:11 +0000 Message-ID: <1572296801-4789-5-git-send-email-haiyangz@microsoft.com> References: <1572296801-4789-1-git-send-email-haiyangz@microsoft.com> In-Reply-To: <1572296801-4789-1-git-send-email-haiyangz@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: CO2PR04CA0076.namprd04.prod.outlook.com (2603:10b6:102:1::44) To DM6PR21MB1242.namprd21.prod.outlook.com (2603:10b6:5:169::22) authentication-results: spf=none (sender IP is ) smtp.mailfrom=lkmlhyz@microsoft.com; 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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: N2iu8QmvCapfjPeyHZjuDypd2A2cbxTl33hDk1j8ao+8ILwOJ+Fc2R6k4BdfcO78e8jF//lop4cZy87auDxGCJTpKZn/1fmNSLPRoHgmLU5Da8g4vRWKtj1/Mj0yMP3xCwcVLc1mIdsHG9QZDvKbqjGknOEataRn/XX5wO9QzYna8rEsiKT7LN0Dj4X93h1iMJv1hKDHEs6Blaxt2BZ/+9wVfa5Rt5QsOKJmZvx6mHbFm+GIgDi4uns7bsIMcMwmm6UZgm4mryky/XdvfnZ0U1IamvT8HyfjakdVsuOIW9q9vC4xJbHLu42oXshrqRhlpcBpCONoKoMtPJPcjojRl25f1QtFn68vyDS/VZZX2gPIKrfW2Ytyi3gdVJN6AVUObs0ohG7HFp8b16rhfZaY1KoMdFR4WWXR6+uWVCfomtJx0z8PHviqhvghED9FnO40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: b5df6643-1b7a-423a-8c18-08d75beacc99 X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Oct 2019 21:07:11.1213 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: KMNWNELcFRmEOdzrLnQ8aJ1PWR/TcqXTh4no8W6DD5VLqb5BCr9e4fY8t8kLD991IRZAn7Fv7XtbDIlepQ/OOQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR21MB1404 Sender: linux-hyperv-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org Added the new section in the document regarding XDP support by hv_netvsc driver. Signed-off-by: Haiyang Zhang --- .../networking/device_drivers/microsoft/netvsc.txt | 14 ++++++++++= ++++ 1 file changed, 14 insertions(+) diff --git a/Documentation/networking/device_drivers/microsoft/netvsc.txt b= /Documentation/networking/device_drivers/microsoft/netvsc.txt index 3bfa635..69ccfca 100644 --- a/Documentation/networking/device_drivers/microsoft/netvsc.txt +++ b/Documentation/networking/device_drivers/microsoft/netvsc.txt @@ -82,3 +82,17 @@ Features contain one or more packets. The send buffer is an optimization, the dri= ver will use slower method to handle very large packets or if the send buffe= r area is exhausted. + + XDP support + ----------- + XDP (eXpress Data Path) is a feature that runs eBPF bytecode at the earl= y + stage when packets arrive at a NIC card. The goal is to increase perform= ance + for packet processing, reducing the overhead of SKB allocation and other + upper network layers. + + hv_netvsc supports XDP in native mode, and transparently sets the XDP + program on the associated VF NIC as well. + + XDP program cannot run with LRO (RSC) enabled, so you need to disable LR= O + before running XDP: + ethtool -K eth0 lro off --=20 1.8.3.1