From patchwork Wed Apr 18 04:29:40 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Nikita V. Shirokov" X-Patchwork-Id: 899908 Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=tehnerd.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=tehnerd-com.20150623.gappssmtp.com header.i=@tehnerd-com.20150623.gappssmtp.com header.b="jFkxNt2U"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 40Qs7C6NTZz9s1v for ; Wed, 18 Apr 2018 16:05:59 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752665AbeDRGFu (ORCPT ); Wed, 18 Apr 2018 02:05:50 -0400 Received: from mail-pl0-f46.google.com ([209.85.160.46]:47087 "EHLO mail-pl0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751836AbeDRGFt (ORCPT ); Wed, 18 Apr 2018 02:05:49 -0400 Received: by mail-pl0-f46.google.com with SMTP id 59-v6so453419plc.13 for ; Tue, 17 Apr 2018 23:05:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tehnerd-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id; bh=UqdEka01tGQ43S9R2dnV3VdvQGzIJhl0qRxt1ZT21IU=; b=jFkxNt2UfuocJPNUcvWhR8doy+Rnb9YOSToJtVaMtMkMwtZVuxfyuU2avErdRgb9U1 qS7ddl4v5J+HKmv88u9XXAaFEh4a/K5dr7xxO9GB3udBfrua6Y+la9PhhWvfaoAvU7K7 h1cgAzhbOlTDE3J/NufXnkwlcXU2mUV1Vw4nLLFpo5BtJE6f5QyZjEwgQR2wDVSTwnjq 2z3hV5TSxzjT05JVyNC6g8yIDI994Y+KYZ5eq7hPRkr3jVvkbyEz4xr4n1+XbDKSZrxv ErIdmxP/+Ch9QuXzd4Zo7uQeFDqJk8t62FY+5+XynWpBAa9KE4dsyBoRwx8jdrAt5CPJ jPcg== 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:date:message-id; bh=UqdEka01tGQ43S9R2dnV3VdvQGzIJhl0qRxt1ZT21IU=; b=mMOMqg/1CYh//FWKSEbk5Vk3ZDqG3egIU7IyGOJEMGw8VC3RjckVJMnCD1EZpJboG2 baLCi6/YZa3kBV1NZgIlmKDHky7juasp80Te8Oete5uzosNypsbyNwk1G6eP9nt+yNu7 y/clq4sfHInPxzl7/cbo0XALy52gCOyMijDPNmKIMrWq+UPKPMNHrIldVtBZep9Ok2aj 6aHMOQgExy69vA9cHlKZMnjMJZN2jCCz7VWFty1A2A+zEBUeWzphltkaINaxEgdN6sEi Z3yGx6H9pNDPAtOcRymufdqf5Qoaqq2CaJHHHQjaWAQUkbkCLOYPbB7dNx9/6TLLvHLL xScg== X-Gm-Message-State: ALQs6tAz0+OPaLDGlMXKSVAK4zkcaOqGlDKi+udkQQFJ+7XJeSCkz+/Y 03c1Gqf42tQJvsCarNNQ3SGonMs1DOUbcw== X-Google-Smtp-Source: AIpwx4/riAnCdk6876ffCPQCwiZYEa9lph2XCAihkaLtuEKxBp0UGA+9lR0RFJYVBU1CBi48XPZkdA== X-Received: by 2002:a17:902:1e2:: with SMTP id b89-v6mr820966plb.389.1524031548648; Tue, 17 Apr 2018 23:05:48 -0700 (PDT) Received: from maindev.thefacebook.com ([199.201.64.2]) by smtp.gmail.com with ESMTPSA id a6sm799141pfo.157.2018.04.17.23.05.47 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 17 Apr 2018 23:05:47 -0700 (PDT) From: "Nikita V. Shirokov" To: Alexei Starovoitov , Daniel Borkmann Cc: netdev@vger.kernel.org, "Nikita V. Shirokov" Subject: [PATCH bpf-next v2 00/11] introduction of bpf_xdp_adjust_tail Date: Tue, 17 Apr 2018 21:29:40 -0700 Message-Id: <20180418042951.17183-1-tehnerd@tehnerd.com> X-Mailer: git-send-email 2.15.1 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org In this patch series i'm add new bpf helper which allow to manupulate xdp's data_end pointer. right now only "shrinking" (reduce packet's size by moving pointer) is supported (and i see no use case for "growing"). Main use case for such helper is to be able to generate controll (ICMP) messages from XDP context. such messages usually contains first N bytes from original packets as a payload, and this is exactly what this helper would allow us to do (see patch 3 for sample program, where we generate ICMP "packet too big" message). This helper could be usefull for load balancing applications where after additional encapsulation, resulting packet could be bigger then interface MTU. Aside from new helper this patch series contains minor changes in device drivers (for ones which requires), so they would recal packet's length not only when head pointer was adjusted, but if tail's one as well. v1->v2: * fixed kbuild warning * made offset eq 0 invalid for xdp_bpf_adjust_tail * splitted bpf_prog_test_run fix and selftests in sep commits * added SPDX licence where applicable * some reshuffling in patches order (tests now in the end) Nikita V. Shirokov (11): bpf: making bpf_prog_test run aware of possible data_end ptr change bpf: adding tests for bpf_xdp_adjust_tail bpf: adding bpf_xdp_adjust_tail helper bpf: make generic xdp compatible w/ bpf_xdp_adjust_tail bpf: make mlx4 compatible w/ bpf_xdp_adjust_tail bpf: make bnxt compatible w/ bpf_xdp_adjust_tail bpf: make cavium thunder compatible w/ bpf_xdp_adjust_tail bpf: make netronome nfp compatible w/ bpf_xdp_adjust_tail bpf: make tun compatible w/ bpf_xdp_adjust_tail bpf: make virtio compatible w/ bpf_xdp_adjust_tail bpf: add bpf_xdp_adjust_tail sample prog drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c | 2 +- drivers/net/ethernet/cavium/thunder/nicvf_main.c | 2 +- drivers/net/ethernet/mellanox/mlx4/en_rx.c | 2 +- .../net/ethernet/netronome/nfp/nfp_net_common.c | 2 +- drivers/net/tun.c | 3 +- drivers/net/virtio_net.c | 7 +- include/uapi/linux/bpf.h | 10 +- net/bpf/test_run.c | 3 +- net/core/dev.c | 10 +- net/core/filter.c | 29 +++- samples/bpf/Makefile | 4 + samples/bpf/xdp_adjust_tail_kern.c | 152 +++++++++++++++++++++ samples/bpf/xdp_adjust_tail_user.c | 142 +++++++++++++++++++ tools/include/uapi/linux/bpf.h | 10 +- tools/testing/selftests/bpf/Makefile | 2 +- tools/testing/selftests/bpf/bpf_helpers.h | 5 + tools/testing/selftests/bpf/test_adjust_tail.c | 30 ++++ tools/testing/selftests/bpf/test_progs.c | 32 +++++ 18 files changed, 435 insertions(+), 12 deletions(-) create mode 100644 samples/bpf/xdp_adjust_tail_kern.c create mode 100644 samples/bpf/xdp_adjust_tail_user.c create mode 100644 tools/testing/selftests/bpf/test_adjust_tail.c