From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 93014C54FD0 for ; Fri, 24 Apr 2020 14:09:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6C35F20700 for ; Fri, 24 Apr 2020 14:09:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="CfSurklH" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727044AbgDXOJQ (ORCPT ); Fri, 24 Apr 2020 10:09:16 -0400 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:47507 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726698AbgDXOJP (ORCPT ); Fri, 24 Apr 2020 10:09:15 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1587737354; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YN7999rX4utRhqbmuRWdXiWCZb5Me/7HfCrt4nkY/sg=; b=CfSurklHNPhwCu7KQjk9WB1qEVGG/bz0YgzFGleNmG2Z2c7mWsbLk2uG8H06IhfUDdgz1p prJf3JYwn9KAG6im8qzlkF24PX37fhaxpuxe2+S+hCHJn8fm+rAW/bHhNMLvUwnYsg6HAF Y7WJJBQt29aSbyw2aE2nFO+oikcdxjs= Received: from mail-lf1-f72.google.com (mail-lf1-f72.google.com [209.85.167.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-324-8u3nes-RO-GzCbtxI5fTiQ-1; Fri, 24 Apr 2020 10:09:12 -0400 X-MC-Unique: 8u3nes-RO-GzCbtxI5fTiQ-1 Received: by mail-lf1-f72.google.com with SMTP id v6so3955200lfi.6 for ; Fri, 24 Apr 2020 07:09:12 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:in-reply-to:references:date :message-id:mime-version:content-transfer-encoding; bh=YN7999rX4utRhqbmuRWdXiWCZb5Me/7HfCrt4nkY/sg=; b=Bq5zXkOedfL6N+qzlW+SCQ1wTOA0PySPbSj7WiC8H0vCkCnf04A3OZjV002tnSthjE 3K00IPUKU/6vNt3d/FEJm3dUkle6HfnL25FXsDu4kK5HNvRq16nBs/AX5ckWx7TAySR6 sflTq5swlOwGtPP/HSnUWvBnZ2pCbu9aDvvmFtldO3Wr4kOnq/umFRJR+dKp97UTHmnm 7hvHceSxoKVt4EnT/dfEgAf6AGPq1lrtvL8OLRAGIX17noHV8zZTrMd5c3WwU+5IiMmL EW6hNDTKMLDOOD9BdQauBnEIPRLgxZfHjDDMJfvUM7OZX9v3B5G3A1cgLy+5IhYvNC+3 sbug== X-Gm-Message-State: AGi0PuYF9OsdRIBVyTmVGU+OGLBlXadmLFPK7WzLfIRHgsJPs+wXwdcU DkDJL0EQvinuywnEyya6QVSpz3dyf410boad5nZ/imltLnPd8oV03d/eB3j3l5lkaLPIk/KXfSJ nf6qyjkC7RZto X-Received: by 2002:a05:6512:1046:: with SMTP id c6mr6350115lfb.115.1587737350945; Fri, 24 Apr 2020 07:09:10 -0700 (PDT) X-Google-Smtp-Source: APiQypI77hXNzCROBvO6tUL4ElNeY8qsvtwRc8vAGThnY91mBNThLVAc58fyw7CrDrVU4ftrKSZDfw== X-Received: by 2002:a05:6512:1046:: with SMTP id c6mr6350091lfb.115.1587737350711; Fri, 24 Apr 2020 07:09:10 -0700 (PDT) Received: from alrua-x1.borgediget.toke.dk ([2a0c:4d80:42:443::2]) by smtp.gmail.com with ESMTPSA id 23sm4265005lju.106.2020.04.24.07.09.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Apr 2020 07:09:09 -0700 (PDT) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 27F771814FF; Fri, 24 Apr 2020 16:09:09 +0200 (CEST) From: Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= To: Jesper Dangaard Brouer , sameehj@amazon.com Cc: Jesper Dangaard Brouer , netdev@vger.kernel.org, bpf@vger.kernel.org, zorik@amazon.com, akiyano@amazon.com, gtzalik@amazon.com, Daniel Borkmann , Alexei Starovoitov , John Fastabend , Alexander Duyck , Jeff Kirsher , David Ahern , Willem de Bruijn , Ilias Apalodimas , Lorenzo Bianconi , Saeed Mahameed , steffen.klassert@secunet.com Subject: Re: [PATCH net-next 29/33] xdp: allow bpf_xdp_adjust_tail() to grow packet size In-Reply-To: <158757178840.1370371.13037637865133257416.stgit@firesoul> References: <158757160439.1370371.13213378122947426220.stgit@firesoul> <158757178840.1370371.13037637865133257416.stgit@firesoul> X-Clacks-Overhead: GNU Terry Pratchett Date: Fri, 24 Apr 2020 16:09:09 +0200 Message-ID: <87wo652cxm.fsf@toke.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Jesper Dangaard Brouer writes: > Finally, after all drivers have a frame size, allow BPF-helper > bpf_xdp_adjust_tail() to grow or extend packet size at frame tail. > > Remember that helper/macro xdp_data_hard_end have reserved some > tailroom. Thus, this helper makes sure that the BPF-prog don't have > access to this tailroom area. > > Signed-off-by: Jesper Dangaard Brouer Acked-by: Toke H=C3=B8iland-J=C3=B8rgensen