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Miller" , "linux-kernel@vger.kernel.org" Subject: RE: [Intel-wired-lan] [PATCH v4 net-next 0/9] net: intel: napi_alloc_skb() vs metadata Thread-Topic: [Intel-wired-lan] [PATCH v4 net-next 0/9] net: intel: napi_alloc_skb() vs metadata Thread-Index: AQHX7D0GBStG13BisUmYcc0eBW8cqqxcPCkA Date: Mon, 10 Jan 2022 10:11:43 +0000 Message-ID: References: <20211208140702.642741-1-alexandr.lobakin@intel.com> In-Reply-To: <20211208140702.642741-1-alexandr.lobakin@intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-version: 11.6.200.16 dlp-product: dlpe-windows dlp-reaction: no-action authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: bac306f0-975c-4230-86c7-08d9d4219a61 x-ms-traffictypediagnostic: DM6PR11MB4153:EE_ x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:608; x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR11MB3292.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: bac306f0-975c-4230-86c7-08d9d4219a61 X-MS-Exchange-CrossTenant-originalarrivaltime: 10 Jan 2022 10:11:43.8102 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: GdExyaBiYwy+jgf3g4gumVHT8rbhRpj4DJ32D8xsCnBxxjWf9TWP+DogXjWPWW3MgF18Vy4/3bx2mO5gV7ZZ4to5gjOaNlFWwqLOlLJXJzY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR11MB4153 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org > -----Original Message----- > From: Intel-wired-lan On Behalf Of > Alexander Lobakin > Sent: Wednesday, December 8, 2021 7:37 PM > To: intel-wired-lan@lists.osuosl.org > Cc: Song Liu ; Jesper Dangaard Brouer > ; Daniel Borkmann ; Yonghong > Song ; Martin KaFai Lau ; John Fastabend > ; Alexei Starovoitov ; Andrii > Nakryiko ; Bj=F6rn T=F6pel ; > netdev@vger.kernel.org; Jakub Kicinski ; KP Singh > ; bpf@vger.kernel.org; David S. Miller > ; linux-kernel@vger.kernel.org > Subject: [Intel-wired-lan] [PATCH v4 net-next 0/9] net: intel: napi_alloc= _skb() > vs metadata >=20 > This is an interpolation of [0] to other Intel Ethernet drivers (and is (= re)based > on its code). > The main aim is to keep XDP metadata not only in case with build_skb(), b= ut > also when we do napi_alloc_skb() + memcpy(). >=20 > All Intel drivers suffers from the same here: > - metadata gets lost on XDP_PASS in legacy-rx; > - excessive headroom allocation on XSK Rx to skbs; > - metadata gets lost on XSK Rx to skbs. >=20 > Those get especially actual in XDP Hints upcoming. > I couldn't have addressed the first one for all Intel drivers due to that= they > don't reserve any headroom for now in legacy-rx mode even with XDP > enabled. This is hugely wrong, but requires quite a bunch of work and a > separate series. Luckily, ice doesn't suffer from that. > igc has 1 and 3 already fixed in [0]. >=20 > From v3 ([1]): > - fix driver name and ixgbe_construct_skb() function name in the > commit message of #9 (Jesper); > - no functional changes. >=20 > From v2 (unreleased upstream): > - tweaked 007 to pass bi->xdp directly and simplify code (Maciej); > - picked Michal's Reviewed-by. >=20 > From v1 (unreleased upstream): > - drop "fixes" of legacy-rx for i40e, igb and ixgbe since they have > another flaw regarding headroom (see above); > - drop igc cosmetic fixes since they landed upstream incorporated > into Jesper's commits; > - picked one Acked-by from Maciej. >=20 > [0] > https://lore.kernel.org/netdev/163700856423.565980.101625649213476937 > 58.stgit@firesoul > [1] https://lore.kernel.org/netdev/20211207205536.563550-1- > alexandr.lobakin@intel.com >=20 > Alexander Lobakin (9): > i40e: don't reserve excessive XDP_PACKET_HEADROOM on XSK Rx to skb > i40e: respect metadata on XSK Rx to skb > ice: respect metadata in legacy-rx/ice_construct_skb() > ice: don't reserve excessive XDP_PACKET_HEADROOM on XSK Rx to skb > ice: respect metadata on XSK Rx to skb > igc: don't reserve excessive XDP_PACKET_HEADROOM on XSK Rx to skb > ixgbe: pass bi->xdp to ixgbe_construct_skb_zc() directly > ixgbe: don't reserve excessive XDP_PACKET_HEADROOM on XSK Rx to skb > ixgbe: respect metadata on XSK Rx to skb >=20 > drivers/net/ethernet/intel/i40e/i40e_xsk.c | 16 +++++++----- > drivers/net/ethernet/intel/ice/ice_txrx.c | 15 ++++++++--- > drivers/net/ethernet/intel/ice/ice_xsk.c | 16 +++++++----- > drivers/net/ethernet/intel/igc/igc_main.c | 13 +++++----- > drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 27 ++++++++++++-------- > 5 files changed, 54 insertions(+), 33 deletions(-) >=20 Tested-by: Kiran Bhandare A Contingent Worker = at Intel