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=-5.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 94D05C433E7 for ; Tue, 13 Oct 2020 16:34:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 54B7F252A4 for ; Tue, 13 Oct 2020 16:34:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="iFUdESmh" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726492AbgJMQeb (ORCPT ); Tue, 13 Oct 2020 12:34:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55450 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726120AbgJMQeb (ORCPT ); Tue, 13 Oct 2020 12:34:31 -0400 Received: from mail-ot1-x32a.google.com (mail-ot1-x32a.google.com [IPv6:2607:f8b0:4864:20::32a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F89DC0613D0 for ; Tue, 13 Oct 2020 09:34:31 -0700 (PDT) Received: by mail-ot1-x32a.google.com with SMTP id m22so608642ots.4 for ; Tue, 13 Oct 2020 09:34:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:references:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; bh=fYXc1GYzkLYpOsWrmudmLUIH+WssinhSShDKjcB0jw0=; b=iFUdESmhXGng9QZdt1TdB4rh+EoskljdnXxVO/vQwnBs4CFkMiPOPQVajDZ9LTySBB leD9zo4lc+8fZUzzEzdGfz7d6CmEKikigO7vAr2IvEGa1W82YMkiAdRw/T0kVb59c0/Y TBxsc2LOaSqROQs0yMMKsLalzYKiN46/uGKpkqUOWsXPgKfxgJRIzolf4hkwy160BU7u QBhhKDJ59G4cfK+i6q6CAusSuaw6dJGGs5vNxG0LZtlw9bzT7TxHy5s3MxP4z45c5fde irtAkd3m+BUA6Az+FvMwflX9C2yYjgcvdhidiTonyY+uniwiwh1cifjogkB6j1LCF6iN S9Cw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:references:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=fYXc1GYzkLYpOsWrmudmLUIH+WssinhSShDKjcB0jw0=; b=XnZw0PxazRvA0B4q3U3AICn2vvaBUjqlkWZhA0+LCVZkxfifxWTi8DKdNLxnx5IyTY nYA6Chou/ia3hHYPKUw9h6vuXSWiVOY0nZg31uxhEZwE7qGg8fvX4H0yrS9nfL39LO2q INBdtuUhBgqNeY/712hU7SK2FX1uObm7TaUEUYciuk4XNz5B+AtBTm53kf47D1JlE5st K3nc5QrbwMQRmJHbbj9w9fgFBxNwuBJevizvLoB8j14skNjjIXtqVYgCKrxd0J9sBvEJ swC7SgrYvOHfrFNDHSvv0QnVIniRNFeaGT9ViPy4MZH9AdtD6QAz9cbnvYHmdA9MXR1g 3d8w== X-Gm-Message-State: AOAM533Qk1ZElPK5AAcwlj9l/G1jr7kuAVskqPSx5RVN2co5RwejtjCH UWpHw+aia8ZXGafF2cv/St5xMKbiPO8= X-Google-Smtp-Source: ABdhPJxiz75v8BScCptJlGnzRxLXW5BImj7gmT9dMrcijMdDJQ8g61/yMoim0ngTw1kv7ZBHPdjx2g== X-Received: by 2002:a9d:1ec2:: with SMTP id n60mr356704otn.63.1602606870356; Tue, 13 Oct 2020 09:34:30 -0700 (PDT) Received: from ?IPv6:2603:8081:140c:1a00:f92c:93be:3e9d:c2cd? (2603-8081-140c-1a00-f92c-93be-3e9d-c2cd.res6.spectrum.com. [2603:8081:140c:1a00:f92c:93be:3e9d:c2cd]) by smtp.gmail.com with ESMTPSA id q64sm100747oib.2.2020.10.13.09.34.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 13 Oct 2020 09:34:29 -0700 (PDT) Subject: Re: dynamic-sg patch has broken rdma_rxe From: Bob Pearson To: Jason Gunthorpe , linux-rdma@vger.kernel.org References: <0fdfc60e-ea93-8cf2-b23a-ce5d07d5fe33@gmail.com> Message-ID: <06d6710b-f05e-e370-2acb-68f88040948e@gmail.com> Date: Tue, 13 Oct 2020 11:34:29 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <0fdfc60e-ea93-8cf2-b23a-ce5d07d5fe33@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On 10/13/20 9:33 AM, Bob Pearson wrote: > Jason, > > Just pulled for-next and now hit the following warning. > Register user space memory is not longer working. > I am trying to debug this but if you have any idea where to look let me know. > > Bob > > [ 209.562096] WARNING: CPU: 12 PID: 5343 at lib/scatterlist.c:438 __sg_alloc_table_from_pages+0x21/0x440 SNIP > I found it. The rxe driver had set the max_segment_size to UINT_MAX (0xffffffff) which triggered the warning since it has an 'offset into page' in __sg_alloc_table_from_pages. Can you tell me what this parameter is supposed to do and what is a reasonable value. What scares me is that the default used in ib_umem_get is 64K. Does this have anything to do with the largest SGL size or is it something else. Bob