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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8A773C433EF for ; Thu, 30 Jun 2022 18:18:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236458AbiF3SSo (ORCPT ); Thu, 30 Jun 2022 14:18:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37094 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231596AbiF3SSm (ORCPT ); Thu, 30 Jun 2022 14:18:42 -0400 Received: from mail-wr1-x436.google.com (mail-wr1-x436.google.com [IPv6:2a00:1450:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BE9C741638; Thu, 30 Jun 2022 11:18:41 -0700 (PDT) Received: by mail-wr1-x436.google.com with SMTP id i1so24001714wrb.11; Thu, 30 Jun 2022 11:18:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=IlWda/HqLDW0Gj9EzBCbVVvBNMNupFxIokvORQdSsqo=; b=V/zbNJ6cE8PQmwOmoJpRuC574tlVTyOl3bRzQSGcqGDXct0qNy8MUEeBECXhj/izKq UiVXAKMnTGkdjCUTIycQfaT4doug4CMxnqNEoxZSDoRsJGp0QgzInqRw88lm11V4Tn5c nt/ho05icwky/AApXOKb5fuh/eDQo5Byho5ynpwCofAWcCrXg1km3LKX5FDh9fmgfIN7 9QmqnDnskFHha6ziAQtYGUiC7vrbTIOD0lIa3WA02vfli5feqRTEx5f+wohvzfl04HZp BeULzibZbiN+ByeEVVZBmI+R0z8W+ZXNJ3QSwOK+KttculFfTLMBIl8A4SGiwLHBjz4J MTHQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=IlWda/HqLDW0Gj9EzBCbVVvBNMNupFxIokvORQdSsqo=; b=G8YHqaVmYK5v6JBja2NVR5orVF4rIURfxY93muzAQ9Rnn9hSxnqbei3JFt3n0XlYld FgR8n9zpvq5f9+JUUCV3gHh/Sb4Ma0D2Ec10fTte4G+l2xM9SIOo31gAb9w8xJglpmXp ophXmgzo9luYxk94JF8Q5VqrzVgVhRpoeGORl1DlwdpM2SXmC4RGsJ2ks8Ck/uJYlQO6 NpZDV3XE10q/wkLU6KNTSivCUnyjQotUtRQ6+piXJrN9RqDt0MYgyAiDHmzxB2OL0S+b VWzyNbwY1dh3d+12oxthn90DPSHbEOzWkw0h4H5Wd89WTuJGsLmhwQEivAq2KbD6UHDt 2rIg== X-Gm-Message-State: AJIora9I/E6hBL0Zb+KQUSP5iXhrAHb0ubs98pnr1Ts2UQy9/ODDIuHZ QKHw2i/JvIHUYfRbPsdZDeQXFFlYa0Qn+w== X-Google-Smtp-Source: AGRyM1vREQxVFqTQbWuZ+WMeoR0noQOq0lb5dZV2MaVEVJr5GIj324clqAcL9faYncg9EBN8e8VzLA== X-Received: by 2002:adf:dc91:0:b0:21b:89bc:9d5c with SMTP id r17-20020adfdc91000000b0021b89bc9d5cmr9822813wrj.159.1656613120062; Thu, 30 Jun 2022 11:18:40 -0700 (PDT) Received: from opensuse.localnet (host-87-6-98-182.retail.telecomitalia.it. [87.6.98.182]) by smtp.gmail.com with ESMTPSA id l34-20020a05600c1d2200b003a03e63e428sm4648060wms.36.2022.06.30.11.18.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Jun 2022 11:18:38 -0700 (PDT) From: "Fabio M. De Francesco" To: Eric Dumazet , Alexander Duyck Cc: Maciej Fijalkowski , Jesper Dangaard Brouer , Daniel Borkmann , intel-wired-lan , Alexander Duyck , John Fastabend , Jesse Brandeburg , Alexei Starovoitov , Netdev , Jakub Kicinski , bpf , Paolo Abeni , Ira Weiny , "David S. Miller" , LKML Subject: Re: [Intel-wired-lan] [PATCH] ixgbe: Use kmap_local_page in ixgbe_check_lbtest_frame() Date: Thu, 30 Jun 2022 20:18:36 +0200 Message-ID: <2254584.ElGaqSPkdT@opensuse> In-Reply-To: References: <20220629085836.18042-1-fmdefrancesco@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On gioved=C3=AC 30 giugno 2022 18:09:18 CEST Alexander Duyck wrote: > On Thu, Jun 30, 2022 at 8:25 AM Eric Dumazet wrote: > > > > On Thu, Jun 30, 2022 at 5:17 PM Alexander Duyck > > wrote: > > > > > > On Thu, Jun 30, 2022 at 3:10 AM Maciej Fijalkowski > > > wrote: > > > > > > > > On Wed, Jun 29, 2022 at 10:58:36AM +0200, Fabio M. De Francesco=20 wrote: > > > > > The use of kmap() is being deprecated in favor of=20 kmap_local_page(). > > > > > > > > > > With kmap_local_page(), the mapping is per thread, CPU local and= =20 not > > > > > globally visible. Furthermore, the mapping can be acquired from=20 any context > > > > > (including interrupts). > > > > > > > > > > Therefore, use kmap_local_page() in ixgbe_check_lbtest_frame()=20 because > > > > > this mapping is per thread, CPU local, and not globally visible. > > > > > > > > Hi, > > > > > > > > I'd like to ask why kmap was there in the first place and not plain > > > > page_address() ? > > > > > > > > Alex? > > > > > > The page_address function only works on architectures that have=20 access > > > to all of physical memory via virtual memory addresses. The kmap > > > function is meant to take care of highmem which will need to be=20 mapped > > > before it can be accessed. > > > > > > For non-highmem pages kmap just calls the page_address function. > > > https://elixir.bootlin.com/linux/latest/source/include/linux/highmem-= internal.h#L40 > > > > > > Sure, but drivers/net/ethernet/intel/ixgbe/ixgbe_main.c is allocating > > pages that are not highmem ? > > > > This kmap() does not seem needed. >=20 > Good point. So odds are page_address is fine to use. Actually there is > a note to that effect in ixgbe_pull_tail. >=20 > As such we could probably go through and update igb, and several of > the other Intel drivers as well. >=20 > - Alex >=20 I don't know this code, however I know kmap*(). I assumed that, if author used kmap(), there was possibility that the page= =20 came from highmem. In that case kmap_local_page() looks correct here. However, now I read that that page _cannot_ come from highmem. Therefore,=20 page_address() would suffice. If you all want I can replace kmap() / kunmap() with a "plain"=20 page_address(). Please let me know. Thanks, =46abio 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 Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 13B2EC43334 for ; Tue, 5 Jul 2022 12:51:43 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id C059360EAB; Tue, 5 Jul 2022 12:51:42 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp3.osuosl.org C059360EAB DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=osuosl.org; s=default; t=1657025502; bh=0ifVLjPJvsQl34+s+vHPbojtRYqqCZWo/DlV6swnZDY=; h=From:To:Date:In-Reply-To:References:Subject:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: Cc:From; b=Sr5V8VIXl7QyxROR2SnOU5qCZ9suU1vgOht67M+b9I8w46jyztbn7dEwSejOPJJkK PXT8LGPLT/yzh1fxyJ5rlYKymiKsWLmjs0SQvZuQnrlTkDHqW0qa4DM87a+crpEhNA 0tn05LRFKxkEB7sIwScUnUo8hUdCGxOpkKEWSYAWlXFij46vChHMQj5IITLzVF40Fl adD64+8+a21wPVKXcvkrGsvptYHZXFqpEaCpVsnI7JmTDg56INfrqxXiLYWBsoyTNK HBlJlAofpEtnSfheXzMyiPdl7U9AALN2fN13EmrXSoP391crDkhrmoGF0Jm5NbvF/m 39hES/Dl62Dsw== X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MsiaebSsOYdj; Tue, 5 Jul 2022 12:51:42 +0000 (UTC) Received: from ash.osuosl.org (ash.osuosl.org [140.211.166.34]) by smtp3.osuosl.org (Postfix) with ESMTP id A66AC60F1E; Tue, 5 Jul 2022 12:51:41 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp3.osuosl.org A66AC60F1E Received: from smtp1.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by ash.osuosl.org (Postfix) with ESMTP id 43A9A1BF38E for ; Thu, 30 Jun 2022 18:18:43 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id 2AE36827F0 for ; Thu, 30 Jun 2022 18:18:43 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp1.osuosl.org 2AE36827F0 X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id g598LojkBPO3 for ; Thu, 30 Jun 2022 18:18:42 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.8.0 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp1.osuosl.org 09F6682628 Received: from mail-wr1-x42a.google.com (mail-wr1-x42a.google.com [IPv6:2a00:1450:4864:20::42a]) by smtp1.osuosl.org (Postfix) with ESMTPS id 09F6682628 for ; Thu, 30 Jun 2022 18:18:41 +0000 (UTC) Received: by mail-wr1-x42a.google.com with SMTP id d17so22852421wrc.10 for ; Thu, 30 Jun 2022 11:18:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=IlWda/HqLDW0Gj9EzBCbVVvBNMNupFxIokvORQdSsqo=; b=jaOalPOIcvsTmeQTRdNm99Ws+QkMih/glo0IKlUUrONiZDYgXqX/Z/bKwQbstXAuiS RbBzE4cjtSlh7Qpy+V6/W9x3+/aqyPa3RIEDHFDtjc130wPgkFyEYiUt0aikfI5Lm4EC /YnzXZLa5/JKusXuE5STyRJzNMo0/U5NTJ/86oktjGEKOffVZR9t5bg7mVODVNyN2rnE eoJecEvEXjibI+TnNUEcko0d9cPFqwp71JwWIOMkgrWSXDORndRObqp2+wJcMJrYLmd1 tJ49GEezNAIuF3jyg+sFg7uTfUxVFtMahQvQs49bZosf+2diYS16RU2OAqE7YdEgnN06 6YJQ== X-Gm-Message-State: AJIora9ntdxrLfTz8NsBlSxwLYX/um9kn/4Yrs5QBhT6IFO1YXtPJEv+ KANjLIY/K1dftdxyi/iwue4= X-Google-Smtp-Source: AGRyM1vREQxVFqTQbWuZ+WMeoR0noQOq0lb5dZV2MaVEVJr5GIj324clqAcL9faYncg9EBN8e8VzLA== X-Received: by 2002:adf:dc91:0:b0:21b:89bc:9d5c with SMTP id r17-20020adfdc91000000b0021b89bc9d5cmr9822813wrj.159.1656613120062; Thu, 30 Jun 2022 11:18:40 -0700 (PDT) Received: from opensuse.localnet (host-87-6-98-182.retail.telecomitalia.it. [87.6.98.182]) by smtp.gmail.com with ESMTPSA id l34-20020a05600c1d2200b003a03e63e428sm4648060wms.36.2022.06.30.11.18.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Jun 2022 11:18:38 -0700 (PDT) From: "Fabio M. De Francesco" To: Eric Dumazet , Alexander Duyck Date: Thu, 30 Jun 2022 20:18:36 +0200 Message-ID: <2254584.ElGaqSPkdT@opensuse> In-Reply-To: References: <20220629085836.18042-1-fmdefrancesco@gmail.com> MIME-Version: 1.0 X-Mailman-Approved-At: Tue, 05 Jul 2022 12:51:16 +0000 X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=IlWda/HqLDW0Gj9EzBCbVVvBNMNupFxIokvORQdSsqo=; b=V/zbNJ6cE8PQmwOmoJpRuC574tlVTyOl3bRzQSGcqGDXct0qNy8MUEeBECXhj/izKq UiVXAKMnTGkdjCUTIycQfaT4doug4CMxnqNEoxZSDoRsJGp0QgzInqRw88lm11V4Tn5c nt/ho05icwky/AApXOKb5fuh/eDQo5Byho5ynpwCofAWcCrXg1km3LKX5FDh9fmgfIN7 9QmqnDnskFHha6ziAQtYGUiC7vrbTIOD0lIa3WA02vfli5feqRTEx5f+wohvzfl04HZp BeULzibZbiN+ByeEVVZBmI+R0z8W+ZXNJ3QSwOK+KttculFfTLMBIl8A4SGiwLHBjz4J MTHQ== X-Mailman-Original-Authentication-Results: smtp1.osuosl.org; dkim=pass (2048-bit key, unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20210112 header.b=V/zbNJ6c Subject: Re: [Intel-wired-lan] [PATCH] ixgbe: Use kmap_local_page in ixgbe_check_lbtest_frame() X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jesper Dangaard Brouer , Daniel Borkmann , Netdev , Alexander Duyck , John Fastabend , Jesse Brandeburg , Alexei Starovoitov , intel-wired-lan , Jakub Kicinski , bpf , Paolo Abeni , Ira Weiny , "David S. 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