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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 E16B6C31E4C for ; Fri, 14 Jun 2019 11:07:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B966B2133D for ; Fri, 14 Jun 2019 11:07:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727389AbfFNLHq (ORCPT ); Fri, 14 Jun 2019 07:07:46 -0400 Received: from mail-lj1-f193.google.com ([209.85.208.193]:46333 "EHLO mail-lj1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727119AbfFNLHq (ORCPT ); Fri, 14 Jun 2019 07:07:46 -0400 Received: by mail-lj1-f193.google.com with SMTP id v24so1929560ljg.13 for ; Fri, 14 Jun 2019 04:07:44 -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; bh=3VuI/ARgBvHW+hRNPoKYYqvTrzb3zzgYFggaO8Tlsxg=; b=WubtL98Ami+Oau/2GrQLqb0b1/dj/wjsabIvo/AUD1JlRqZ0P/K6Tw7zczLE81navq BfNEXJUWqYy5fBL7p4I36V7oduSnAyet/MmrBZTnbdh5dGwP4dOXK5mjKbCL7a89tJXG VlEZbeqBdFE7j1ZwwgCSoph3vfcnVAXQJa0sMNKNdxofD9LSNX+e4jc1d7C3xyT87szs wSDqq2/PzB8QSl/VyzD0iTT0TW/s4/cazpXRtAqB99V3eaqHUdpSHnYdAezD4lapT12m 90Ftm/96LoXVGUp0teFPQCoHi/mqkPI5YY8Vs3bdGwkevvO3YgHPVmKAH2TMkLiTZNSd RojQ== X-Gm-Message-State: APjAAAX7PWscMysEPKGEQSwZqtEx8TXFVkfA/Mlbl/8oa3iayq8D1y7w OVquPaAnCeOlizM430HCmeEsUA== X-Google-Smtp-Source: APXvYqywJtw6aSaN0OG9Qqe+rCRaZUDaVXIDDZIoFUX2H+0ODNlrFkK7wX/+s7uKRKpppxfOJcYlaw== X-Received: by 2002:a2e:5341:: with SMTP id t1mr40303992ljd.170.1560510463983; Fri, 14 Jun 2019 04:07:43 -0700 (PDT) Received: from alrua-x1.borgediget.toke.dk (borgediget.toke.dk. [85.204.121.218]) by smtp.gmail.com with ESMTPSA id b25sm427666lff.42.2019.06.14.04.07.43 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Fri, 14 Jun 2019 04:07:43 -0700 (PDT) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 6399D1804AF; Fri, 14 Jun 2019 13:07:42 +0200 (CEST) From: Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= To: Toshiaki Makita , Alexei Starovoitov , Daniel Borkmann , "David S. Miller" , Jakub Kicinski , Jesper Dangaard Brouer , John Fastabend Cc: Toshiaki Makita , netdev@vger.kernel.org, xdp-newbies@vger.kernel.org, bpf@vger.kernel.org, "Michael S. Tsirkin" , Jason Wang , David Ahern Subject: Re: [PATCH bpf 3/3] devmap: Add missing RCU read lock on flush In-Reply-To: <20190614082015.23336-4-toshiaki.makita1@gmail.com> References: <20190614082015.23336-1-toshiaki.makita1@gmail.com> <20190614082015.23336-4-toshiaki.makita1@gmail.com> X-Clacks-Overhead: GNU Terry Pratchett Date: Fri, 14 Jun 2019 13:07:42 +0200 Message-ID: <874l4sctmp.fsf@toke.dk> MIME-Version: 1.0 Content-Type: text/plain Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Toshiaki Makita writes: > .ndo_xdp_xmit() assumes it is called under RCU. For example virtio_net > uses RCU to detect it has setup the resources for tx. The assumption > accidentally broke when introducing bulk queue in devmap. > > Fixes: 5d053f9da431 ("bpf: devmap prepare xdp frames for bulking") > Reported-by: David Ahern > Signed-off-by: Toshiaki Makita > --- I think this is still needed, but the patch context is going to conflict with the patch I linked above... I guess it's up to the maintainers to decide which order to merge them in :) -Toke