From patchwork Tue Apr 17 06:51:21 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: 899083 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="HwoF8k9x"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 40QGBV0v65z9rx7 for ; Tue, 17 Apr 2018 16:51:46 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751211AbeDQGvn (ORCPT ); Tue, 17 Apr 2018 02:51:43 -0400 Received: from mail-pg0-f52.google.com ([74.125.83.52]:37883 "EHLO mail-pg0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751147AbeDQGvm (ORCPT ); Tue, 17 Apr 2018 02:51:42 -0400 Received: by mail-pg0-f52.google.com with SMTP id r14so4969401pgq.4 for ; Mon, 16 Apr 2018 23:51:41 -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=b8NkQdCS4IsBKPiGfFQCCeskbDcpRnMDWvLr9jAy5ps=; b=HwoF8k9xfNv6S1gZ+yjdJWHsnTLBv92WCFibHBOIYhFMin4ySzckLEWGO8VlAtXDYY /nu4pAoxt3TfQHxEcENQKhzoVYFg1v9ChzDsLHH/d6a1CR79gyFEPqFmVUBrgAt+cRwr NISjqOO6wipqkJpPrafBmejopeZhdbbCpfTG8GsD+EuIn/dFtwXog33oaYmta2NmOeBj X32YkxOw46wspzOQ02UWaYREXAKUKzoNZOcxMP9iFK88S1pbb1+w4DskLC+LsIpA4S0A /ffgPJuXiCqGdHilfZKv+pljKyjYG/42u5FGApNP/msO8RZ/ddrtFUznX6b26ll2kuIt L6SQ== 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=b8NkQdCS4IsBKPiGfFQCCeskbDcpRnMDWvLr9jAy5ps=; b=cWjH8RCrSQEw3HPUT0DuYsq1HfpxK8aYMvo/0yp8W6Bqvsx7FIwx3BAyr39Y3hp9Xt x+sWqX+hi1uoz/hmp77h1eLs1olt8mVdId+wBBRPrOmgmzrDLwWj3vLg8jQ+vglwaOMa P1Hyz7ptmPh8Bw3xH1mos3sBa2v1R7k4M32itmTPA4gypiHhnIQ+7j6mCbDVLibsLGZA O3Yb7CkneFGt532M6peuJMFjqAcO44sNtw5mf6hgqccUD82O9WwIc+OVLCODzG5MCLqM Rbmp0KIRqG6Z1+nU/uPMMdZuncpwR2lGI0hXV3ajAMRNO7iLplxUD9nFG0nrcIjzCzwZ pH4Q== X-Gm-Message-State: ALQs6tCgaHIVj3zUvj/LOLSMve6UC66RR5YhGBjo0CX6499WbDE6Gxkn BEB1CMcOYrBFVO+nRCDGR5aaRg== X-Google-Smtp-Source: AIpwx4+d7QXs/CzXRwADl25DtXBWI+TydF0OHsKhRd2z525mdOEC1NyU/1iP5uEaUHMLKWGt7+MvWA== X-Received: by 10.101.100.74 with SMTP id s10mr791009pgv.407.1523947901551; Mon, 16 Apr 2018 23:51:41 -0700 (PDT) Received: from maindev.thefacebook.com ([199.201.64.2]) by smtp.gmail.com with ESMTPSA id u13sm32268031pfd.112.2018.04.16.23.51.39 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 16 Apr 2018 23:51:40 -0700 (PDT) From: "Nikita V. Shirokov" To: Alexei Starovoitov , Daniel Borkmann Cc: netdev@vger.kernel.org, "Nikita V. Shirokov" Subject: [PATCH bpf-next 00/10] introduction of bpf_xdp_adjust_tail Date: Mon, 16 Apr 2018 23:51:21 -0700 Message-Id: <20180417065131.3632-1-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 adding 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. Nikita V. Shirokov (10): [bpf]: adding bpf_xdp_adjust_tail helper [bpf]: adding tests for bpf_xdp_adjust_tail [bpf]: add bpf_xdp_adjust_tail sample prog [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 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 | 151 +++++++++++++++++++++ samples/bpf/xdp_adjust_tail_user.c | 141 +++++++++++++++++++ tools/include/uapi/linux/bpf.h | 11 +- tools/testing/selftests/bpf/Makefile | 2 +- tools/testing/selftests/bpf/bpf_helpers.h | 5 + tools/testing/selftests/bpf/test_adjust_tail.c | 29 ++++ tools/testing/selftests/bpf/test_progs.c | 32 +++++ 18 files changed, 433 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