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=-5.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, 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 BC726C43141 for ; Mon, 2 Dec 2019 15:37:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 920BA20748 for ; Mon, 2 Dec 2019 15:37:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="q2oPyHZL" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727542AbfLBPhI (ORCPT ); Mon, 2 Dec 2019 10:37:08 -0500 Received: from mail-lj1-f195.google.com ([209.85.208.195]:36052 "EHLO mail-lj1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727432AbfLBPhI (ORCPT ); Mon, 2 Dec 2019 10:37:08 -0500 Received: by mail-lj1-f195.google.com with SMTP id r19so6899139ljg.3; Mon, 02 Dec 2019 07:37:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ymp5dH/tOyhbFrKcFGc6DHB4DSRD4uUTLeaKmTaGYlk=; b=q2oPyHZL/3TTBFpgCRtqjuBrofVA+pJljiayFPlHIVQyibDp/pGPUhQ4TPN0BTMBq1 PwgrcrM1HNMU4z1Bbeu4P7uml7uMCVVI1vmC7wPBe5JLgqJO2lztslMGkn0kPFleNGll sPO/e8Mv2lbuNUgTpAdsAwV7iHWeBThvzKsO97R7GNeIrnGKnE7gK6DRNj/Ed9K7OPkv 33/8mDP+LfoNfzjPGmgSxL5dclhWkjDhkp/yoHMzZK7hxYg4/asGxsH2KPoqaGQS5hec Lt3rD5rOFmwlSHTx24/50CdWjJNq8gMIxG9TicislTLdUzTtZYVBX0UfncfZEZUGSNgO jj3A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ymp5dH/tOyhbFrKcFGc6DHB4DSRD4uUTLeaKmTaGYlk=; b=Q3wrA/4N4yUmo/0c1UPqd19WeooLoSI4QMDh6S9vRNSZOoF5z3pcF4piJmogmaXFQ8 PyD52nGOUXuXP9x+OhIT6GLMbpa1AyXtcRAOo03XnpsR+07HvkXDi+zPrRp/jpJmC0Wj wrFaFk3XH1SbXNCpmrQnconT3Z3L5+YtyVcdhCezD1LVoB8/olW+PJ2BAOhtCR38RPmU MbtAZ76p6J+ilwLp+rSAxeWSoKW50RqN1Dn/2d/sErWaQ+iHa7PaiQMu9NtlUzolXXJ3 5dyvb8Ark683NOfqZEaB+MGeQlHXnl+luzRnOOp5Owi3zNvx8p6Ym6S/HtvKPWeAvL3I fP9A== X-Gm-Message-State: APjAAAVdg4Lsbuzp3rEB9Xlbn16uwSmTeaRyhU0phAoM4bDFau3Ezo4w /08xxkA1e61QeqjSSsVbnZmuoT1zTshDiON0M48= X-Google-Smtp-Source: APXvYqwluwHJ6hkTF0NdET0BqZsz1RG5BnqEKPDWQm71gKK2/C2dOu3aO1fOjtjyUbv3pS8tU7kPR1sxYHn5T2ry3ek= X-Received: by 2002:a2e:9610:: with SMTP id v16mr32464966ljh.88.1575301025532; Mon, 02 Dec 2019 07:37:05 -0800 (PST) MIME-Version: 1.0 References: <20191129164842.qimcmjlz5xq7uupw@linutronix.de> In-Reply-To: <20191129164842.qimcmjlz5xq7uupw@linutronix.de> From: Paul Thomas Date: Mon, 2 Dec 2019 10:36:54 -0500 Message-ID: Subject: Re: xdpsock poll with 5.2.21rt kernel To: Sebastian Andrzej Siewior Cc: Alexei Starovoitov , Daniel Borkmann , David Miller , Jakub Kicinski , Jesper Dangaard Brouer , John Fastabend , netdev@vger.kernel.org, xdp-newbies@vger.kernel.org, bpf@vger.kernel.org, linux-rt-users Content-Type: text/plain; charset="UTF-8" Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org On Fri, Nov 29, 2019 at 11:48 AM Sebastian Andrzej Siewior wrote: > > On 2019-11-12 17:42:42 [-0500], Paul Thomas wrote: > > Any thoughts would be appreciated. > > Could please enable CONFIG_DEBUG_ATOMIC_SLEEP and check if the kernel > complains? Hi Sebastian, Well, it does complain (report below), but I'm not sure it's related. The other thing I tried was the AF_XDP example here: https://github.com/xdp-project/xdp-tutorial/tree/master/advanced03-AF_XDP With this example poll() always seems to block correctly, so I think maybe there is something wrong with the xdpsock_user.c example or how I'm using it. [ 259.591480] BUG: assuming atomic context at net/core/ptp_classifier.c:106 [ 259.591488] in_atomic(): 0, irqs_disabled(): 0, pid: 953, name: irq/22-eth%d [ 259.591494] CPU: 0 PID: 953 Comm: irq/22-eth%d Tainted: G WC 5. 2.21-rt13-00016-g93898e751d0e #90 [ 259.591499] Hardware name: Enclustra XU5 SOM (DT) [ 259.591501] Call trace: [ 259.591503] dump_backtrace (/arch/arm64/kernel/traps.c:94) [ 259.591514] show_stack (/arch/arm64/kernel/traps.c:151) [ 259.591520] dump_stack (/lib/dump_stack.c:115) [ 259.591526] __cant_sleep (/kernel/sched/core.c:6386) [ 259.591531] ptp_classify_raw (/./include/linux/compiler.h:194 /./include/asm-generic/atomic-instrumented.h:27 /./include/linux/jump_label.h:251 /net/core/ptp_classifier.c:106) [ 259.591537] skb_defer_rx_timestamp (/./include/linux/skbuff.h:2236 /net/core/timestamping.c:60) [ 259.591541] netif_receive_skb_internal (/net/core/dev.c:5217) [ 259.591547] netif_receive_skb (/net/core/dev.c:5296) [ 259.591550] gem_rx (/drivers/net/ethernet/cadence/macb_main.c:993) [ 259.591556] macb_poll (/drivers/net/ethernet/cadence/macb_main.c:1265) [ 259.591561] net_rx_action (/net/core/dev.c:6387 /net/core/dev.c:6461) [ 259.591565] __do_softirq (/./include/linux/compiler.h:194 /./arch/arm64/include/asm/preempt.h:12 /kernel/softirq.c:400) [ 259.591569] __local_bh_enable_ip (/kernel/softirq.c:182) [ 259.591574] irq_forced_thread_fn (/kernel/irq/manage.c:1008) [ 259.591579] irq_thread (/kernel/irq/manage.c:1101) [ 259.591584] kthread (/kernel/kthread.c:255) [ 259.591589] ret_from_fork (/arch/arm64/kernel/entry.S:1176)