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=-11.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 00482C4320E for ; Thu, 26 Aug 2021 21:17:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D6EA560232 for ; Thu, 26 Aug 2021 21:17:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243688AbhHZVSq (ORCPT ); Thu, 26 Aug 2021 17:18:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41540 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230182AbhHZVSp (ORCPT ); Thu, 26 Aug 2021 17:18:45 -0400 Received: from mail-qk1-x72c.google.com (mail-qk1-x72c.google.com [IPv6:2607:f8b0:4864:20::72c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7486DC061757 for ; Thu, 26 Aug 2021 14:17:57 -0700 (PDT) Received: by mail-qk1-x72c.google.com with SMTP id y144so5029887qkb.6 for ; Thu, 26 Aug 2021 14:17:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=2dbezjWSe7D6F6hU5LkSBT9ACgQN4LkANVFNNs9hSzA=; b=KcpVjXQ1vg+H0QbyVZs1msSUkpH/LjinCATrCtdUqoqgpfYety8XaWI6dM4rLDaQ6W G2QZ6mtY/gtZbD09dy9C53/yIAtjX6pcDvuZLx8+8breu8XWP09mOrhKaKkHaUwyUjPY NInkiGTTrd6GVH5taQ79XzZITUpu4KVWDsd1c= 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=2dbezjWSe7D6F6hU5LkSBT9ACgQN4LkANVFNNs9hSzA=; b=OeidQHdAWVB97M7EmlRcFv4tWCf7gBgaRIkzyYEMrjXm3zMLpEiUoEKj0CwH6hBlVE LJO5ZVYQWlSTdndQtxJq5++WBrTmsPDjHFy3huhkWLC0tcgsrpNvRNhsmkuDek6aY2m5 DMn+q2eigiZMh63Z1mmlznPs+9S5/jY5zFOp/pKkGZfX9e8NhWr6bM+XJa0xLw5N5OEe RI+p2p/3Ld+suSZuQ2n8yq8Md5iDF87U0ScvRrT/7J5LI3XrDCrAcFaPJ9H4SR4GeynK r8VJ8fV5IGo5P0LN+X0ukNpT3phrczEujK0nXGI/b/qap9HUkTs54kHmNX1BN9rTl3ri Y3KQ== X-Gm-Message-State: AOAM533T1YVpH7MG6720z1vS5tHYfKBnF/kwT9a3Svv2EJ7P3XX4ByhA q6a3WJyis7uUJYMCt9ISNusskfLugjkZYNzIWWFmYg== X-Google-Smtp-Source: ABdhPJyylGsCsOKXNn/MAaDOVXT889LB8lgdX/3++VF230FNepIYJSLQVkArzvMwHuc3GSt0MN4IxlkuQWdc1xoWPgI= X-Received: by 2002:a05:620a:bcc:: with SMTP id s12mr5965816qki.431.1630012676269; Thu, 26 Aug 2021 14:17:56 -0700 (PDT) MIME-Version: 1.0 References: <20210826131224.2770403-1-kuba@kernel.org> <20210826131224.2770403-3-kuba@kernel.org> <20210826121821.2c926745@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> In-Reply-To: <20210826121821.2c926745@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> From: Michael Chan Date: Thu, 26 Aug 2021 14:17:45 -0700 Message-ID: Subject: Re: [PATCH net-next v3 2/3] bnxt: count packets discarded because of netpoll To: Jakub Kicinski Cc: David Miller , Netdev , olteanv@gmail.com Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000094c5a605ca7ce60b" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org --00000000000094c5a605ca7ce60b Content-Type: text/plain; charset="UTF-8" On Thu, Aug 26, 2021 at 12:18 PM Jakub Kicinski wrote: > > On Thu, 26 Aug 2021 11:43:58 -0700 Michael Chan wrote: > > On Thu, Aug 26, 2021 at 6:12 AM Jakub Kicinski wrote: > > > @@ -10646,11 +10653,15 @@ static void bnxt_get_ring_stats(struct bnxt *bp, > > > stats->multicast += BNXT_GET_RING_STATS64(sw, rx_mcast_pkts); > > > > > > stats->tx_dropped += BNXT_GET_RING_STATS64(sw, tx_error_pkts); > > > + > > > + bsw_stats->rx.rx_netpoll_discards += > > > + cpr->sw_stats.rx.rx_netpoll_discards; > > > > Can we just add these rx_netpoll_discards counters directly to > > stats->rx_dropped? It looks simpler if we do it that way, right? > > To make sure - are you saying that instead of adding > > struct bnxt_sw_stats sw_stats_prev; > > we should accumulate in net_stats_prev->rx_dropped, and have > the ethtool counter only report the discards since last down/up? > > Or to use the atomic counter on the netdev and never report > in ethtool (since after patch 3 rx_dropped is a mix of reasons)? OK. I've reviewed the patch again and you need to keep the previous netpoll discard counter so that you can report the total current and previous netpoll discard counter under ethtool -S. My suggestion would lump the previous netpoll discard counter into the previous rx_dropped counter and you can only report the current netpoll discard counter under ethtool -S. But note that all the ring related counters we currently report are current counters and do not include old counters before the last reset. --00000000000094c5a605ca7ce60b Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQbQYJKoZIhvcNAQcCoIIQXjCCEFoCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3EMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS MyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA vbCmXCcsbZ/a0fRIQMBxp4gJnnyeneFYpEtNydrZZ+GeKSMdHiDgXD1UnRSIudKo+moQ6YlCOu4t rVWO/EiXfYnK7zeop26ry1RpKtogB7/O115zultAz64ydQYLe+a1e/czkALg3sgTcOOcFZTXk38e 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