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a=rsa-sha256; c=relaxed/relaxed; d=corigine.onmicrosoft.com; s=selector2-corigine-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=+d4Ua5kqsWYZDxhuG/mfvLDIqFfAShI7keasFNjA0WQ=; b=fFgWP09frz/MaRdTi/Q/L5ST+k+Eoqx2YJP7WRigDHiWZEI5B5m32LoPvZMSXTxprHYqbqifsdnmdvlq2PBVz6BLHJfZgEVzJJVM7M8GpkGIwURUxbCgVxf7Hvo+9Wdzz23fdmBXvjZFUITIpCjo/8t7BQ2y7o9so1u5M3q5MEw= X-Mailman-Original-Authentication-Results: smtp3.osuosl.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=corigine.onmicrosoft.com header.i=@corigine.onmicrosoft.com header.a=rsa-sha256 header.s=selector2-corigine-onmicrosoft-com header.b=fFgWP09f X-Mailman-Original-Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=corigine.com; Subject: Re: [Intel-wired-lan] [RFC v2 bpf-next 2/7] drivers: net: turn on XDP features X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mst@redhat.com, vladimir.oltean@nxp.com, ast@kernel.org, edumazet@google.com, anthony.l.nguyen@intel.com, daniel@iogearbox.net, andrii@kernel.org, intel-wired-lan@lists.osuosl.org, simon.horman@corigine.com, kuba@kernel.org, pabeni@redhat.com, aelior@marvell.com, hawk@kernel.org, christophe.jaillet@wanadoo.fr, memxor@gmail.com, john@phrozen.org, bjorn@kernel.org, bpf@vger.kernel.org, magnus.karlsson@intel.com, leon@kernel.org, netdev@vger.kernel.org, toke@redhat.com, ecree.xilinx@gmail.com, alardam@gmail.com, gospo@broadcom.com, saeedm@nvidia.com, davem@davemloft.net, nbd@nbd.name Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" Hi Lorenzo and Marek, Thanks for your work. On 2023-01-14 16:54:32 +0100, Lorenzo Bianconi wrote: [...] > = > Turn 'hw-offload' feature flag on for: > - netronome (nfp) > - netdevsim. Is there a definition of the 'hw-offload' written down somewhere? From = reading this series I take it is the ability to offload a BPF program? = It would also be interesting to read documentation for the other flags = added in this series. [...] > diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c = > b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c > index 18fc9971f1c8..5a8ddeaff74d 100644 > --- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c > +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c > @@ -2529,10 +2529,14 @@ static void nfp_net_netdev_init(struct nfp_net *n= n) > netdev->features &=3D ~NETIF_F_HW_VLAN_STAG_RX; > nn->dp.ctrl &=3D ~NFP_NET_CFG_CTRL_RXQINQ; > = > + nn->dp.netdev->xdp_features =3D NETDEV_XDP_ACT_BASIC | > + NETDEV_XDP_ACT_HW_OFFLOAD; If my assumption about the 'hw-offload' flag above is correct I think = NETDEV_XDP_ACT_HW_OFFLOAD should be conditioned on that the BPF firmware = flavor is in use. nn->dp.netdev->xdp_features =3D NETDEV_XDP_ACT_BASIC; if (nn->app->type->id =3D=3D NFP_APP_BPF_NIC) nn->dp.netdev->xdp_features |=3D NETDEV_XDP_ACT_HW_OFFLOAD; > + > /* Finalise the netdev setup */ > switch (nn->dp.ops->version) { > case NFP_NFD_VER_NFD3: > netdev->netdev_ops =3D &nfp_nfd3_netdev_ops; > + nn->dp.netdev->xdp_features |=3D NETDEV_XDP_ACT_XSK_ZEROCOPY; > break; > case NFP_NFD_VER_NFDK: > netdev->netdev_ops =3D &nfp_nfdk_netdev_ops; This is also a wrinkle I would like to understand. Currently NFP support = zero-copy on NFD3, but not for offloaded BPF programs. But with the BPF = firmware flavor running the device can still support zero-copy for = non-offloaded programs. Is it a problem that the driver advertises support for both = hardware-offload _and_ zero-copy at the same time, even if they can't be = used together but separately? -- = Kind Regards, Niklas S=F6derlund _______________________________________________ Intel-wired-lan mailing list Intel-wired-lan@osuosl.org https://lists.osuosl.org/mailman/listinfo/intel-wired-lan