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 893CFC77B71 for ; Thu, 13 Apr 2023 19:06:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229591AbjDMTG2 (ORCPT ); Thu, 13 Apr 2023 15:06:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50144 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229630AbjDMTGY (ORCPT ); Thu, 13 Apr 2023 15:06:24 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A1C6D7AB3 for ; Thu, 13 Apr 2023 12:05:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1681412738; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UCBVyFd5BBmA+6Xv/IIgNhhtsz0B8DYXHt8AQVnFyEY=; b=NprwkHAm1DRAYaBaeeyvKZiyRfzBk0KR8Kjgn9fc75G8YOiu7iDQPSdi6hDQ2gQRJQQPBS vzIMjVIdunzqbHM3JETIejogU2HtJCnKD9AHLbrg0ZbwFzaxLp/u1QO8cn35tZRBPSbjJE DLyHd7AFygrUYNBaiHkuCLVS7vPIEWE= Received: from mail-ed1-f72.google.com (mail-ed1-f72.google.com [209.85.208.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-670-SnVObUheO12Xwp7S2nBavw-1; Thu, 13 Apr 2023 15:05:35 -0400 X-MC-Unique: SnVObUheO12Xwp7S2nBavw-1 Received: by mail-ed1-f72.google.com with SMTP id 6-20020a508e46000000b0050676a243d2so971642edx.21 for ; Thu, 13 Apr 2023 12:05:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1681412734; x=1684004734; h=content-transfer-encoding:in-reply-to:references:to :content-language:subject:cc:user-agent:mime-version:date:message-id :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=UCBVyFd5BBmA+6Xv/IIgNhhtsz0B8DYXHt8AQVnFyEY=; b=Thz1xQkxVgng/88Gakv5nWqr91YanNefYg5ttH3f3csO/lZfBSA8iFRqJ3czZaqUXH vL0rqArp5eZgJ0vq4N4bdCXfMAMIdV+BAt2W+UMqm5bJilzn8ndr0rT2Nkagiddcyj+8 ERbZGPAb6bSXho8v1B8vF0PGtJCzwEIi77P2nPKEh3E2qsPkLNRJMC1EXnR+Qg0OrrCv HRZ34MRLY+kqj1QQ+OL5F67JrnV/NJOkQ1f9cMHM1bDneYABiAghLxHeKi7jJFGWokcF l496v47HZcq386U2lG/9lnS8CWyxzqoIdnB3kpM+f2PdUPspfcusbAHNuku3cW892lyW OkyA== X-Gm-Message-State: AAQBX9c8v3r7l+Yk/WIx7ne/JukqyyGoIdYjyw11od1GwIxFfx6qtwRA 0Uq+AlYRI/074sj9qp9SQXUFt22003GTkGg00tIs/gIrQKyNHEppT/klAogMfjd3vULjMr8W16F 61/9NbGK+/SYeDFLSMWhSUiRb X-Received: by 2002:a17:907:7783:b0:92b:f118:ef32 with SMTP id ky3-20020a170907778300b0092bf118ef32mr3344076ejc.48.1681412734064; Thu, 13 Apr 2023 12:05:34 -0700 (PDT) X-Google-Smtp-Source: AKy350b0NoeyqPTndxzzpsGhufBoItrSucdDKVSwz86SIeJfM9Bqvf0Y1jAxX92P52cAl7P9mNqd0A== X-Received: by 2002:a17:907:7783:b0:92b:f118:ef32 with SMTP id ky3-20020a170907778300b0092bf118ef32mr3344059ejc.48.1681412733732; Thu, 13 Apr 2023 12:05:33 -0700 (PDT) Received: from [192.168.42.222] (194-45-78-10.static.kviknet.net. [194.45.78.10]) by smtp.gmail.com with ESMTPSA id gz1-20020a170907a04100b0094a6ba1f5ccsm1368474ejc.22.2023.04.13.12.05.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 13 Apr 2023 12:05:33 -0700 (PDT) From: Jesper Dangaard Brouer X-Google-Original-From: Jesper Dangaard Brouer Message-ID: Date: Thu, 13 Apr 2023 21:05:32 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Cc: brouer@redhat.com, intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, xdp-hints@xdp-project.net, stable@vger.kernel.org Subject: Re: [PATCH net 1/1] igc: read before write to SRRCTL register Content-Language: en-US To: Song Yoong Siang , Jesse Brandeburg , Tony Nguyen , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Maciej Fijalkowski , Vedang Patel , Jithu Joseph , Andre Guedes , Stanislav Fomichev References: <20230413151222.1864307-1-yoong.siang.song@intel.com> In-Reply-To: <20230413151222.1864307-1-yoong.siang.song@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 13/04/2023 17.12, Song Yoong Siang wrote: > igc_configure_rx_ring() function will be called as part of XDP program > setup. If Rx hardware timestamp is enabled prio to XDP program setup, > this timestamp enablement will be overwritten when buffer size is > written into SRRCTL register. > > Thus, this commit read the register value before write to SRRCTL > register. This commit is tested by using xdp_hw_metadata bpf selftest > tool. The tool enables Rx hardware timestamp and then attach XDP program > to igc driver. It will display hardware timestamp of UDP packet with > port number 9092. Below are detail of test steps and results. [...] > diff --git a/drivers/net/ethernet/intel/igc/igc_base.h b/drivers/net/ethernet/intel/igc/igc_base.h > index 7a992befca24..b95007d51d13 100644 > --- a/drivers/net/ethernet/intel/igc/igc_base.h > +++ b/drivers/net/ethernet/intel/igc/igc_base.h > @@ -87,8 +87,11 @@ union igc_adv_rx_desc { > #define IGC_RXDCTL_SWFLUSH 0x04000000 /* Receive Software Flush */ > > /* SRRCTL bit definitions */ > -#define IGC_SRRCTL_BSIZEPKT_SHIFT 10 /* Shift _right_ */ > -#define IGC_SRRCTL_BSIZEHDRSIZE_SHIFT 2 /* Shift _left_ */ > +#define IGC_SRRCTL_BSIZEPKT_MASK GENMASK(6, 0) > +#define IGC_SRRCTL_BSIZEPKT_SHIFT 10 /* Shift _right_ */ > +#define IGC_SRRCTL_BSIZEHDRSIZE_MASK GENMASK(13, 8) > +#define IGC_SRRCTL_BSIZEHDRSIZE_SHIFT 2 /* Shift _left_ */ > +#define IGC_SRRCTL_DESCTYPE_MASK GENMASK(27, 25) > #define IGC_SRRCTL_DESCTYPE_ADV_ONEBUF 0x02000000 > > #endif /* _IGC_BASE_H */ > diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c > index 25fc6c65209b..de7b21c2ccd6 100644 > --- a/drivers/net/ethernet/intel/igc/igc_main.c > +++ b/drivers/net/ethernet/intel/igc/igc_main.c > @@ -641,7 +641,10 @@ static void igc_configure_rx_ring(struct igc_adapter *adapter, > else > buf_size = IGC_RXBUFFER_2048; > > - srrctl = IGC_RX_HDR_LEN << IGC_SRRCTL_BSIZEHDRSIZE_SHIFT; > + srrctl = rd32(IGC_SRRCTL(reg_idx)); > + srrctl &= ~(IGC_SRRCTL_BSIZEPKT_MASK | IGC_SRRCTL_BSIZEHDRSIZE_MASK | > + IGC_SRRCTL_DESCTYPE_MASK); ^^ Please fix indention, moving IGC_SRRCTL_DESCTYPE_MASK such that it aligns with IGC_SRRCTL_BSIZEPKT_MASK. This make is easier for the eye to spot that it is part of the negation (~). > + srrctl |= IGC_RX_HDR_LEN << IGC_SRRCTL_BSIZEHDRSIZE_SHIFT; > srrctl |= buf_size >> IGC_SRRCTL_BSIZEPKT_SHIFT; > srrctl |= IGC_SRRCTL_DESCTYPE_ADV_ONEBUF; > 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 smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (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 33A69C77B6E for ; Thu, 13 Apr 2023 19:05:42 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id DDBBD400F2; Thu, 13 Apr 2023 19:05:41 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org DDBBD400F2 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=osuosl.org; s=default; t=1681412741; bh=e3k1NopQzbnkaGJMM4Ua7Ppa2qhZTRFFT9/fdHJ7oK0=; h=From:Date:To:References:In-Reply-To:Subject:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: Cc:From; b=j/T1tqL4B6JTURmU9tMJW88fczMSJtdNCtQreR1MjcxcNJY3hRQXHqrlX4pcz4BbH 4N2l2nN6iF9b+BsszuKBmXDHhVdZNJdtgy08ts2a/Ts1C+VaBqvKh447+SL+Hoq0kA oM88vMg4dzQdZXz5qK+OM0FYBd9KhkjnsDkVORldgo3VFZFkYTLKDdhOAU1mOcqhop P65HrI+ZohGFg4g2M09P6tUA/Qvp+7SNjpC42Hx0QyGjN73Iz1njTSvsvTyoNeMqIr QhxvrJB1Q5G9CoweTYyjaOtO/V8ENlh7oyvFS1Hxh/hEsTXllD3NUZecafJlEJm+yq 9UFBSnufxdqug== X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6tMKHbg2TIFM; Thu, 13 Apr 2023 19:05:41 +0000 (UTC) Received: from ash.osuosl.org (ash.osuosl.org [140.211.166.34]) by smtp2.osuosl.org (Postfix) with ESMTP id D5DFE408A6; Thu, 13 Apr 2023 19:05:40 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org D5DFE408A6 Received: from smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by ash.osuosl.org (Postfix) with ESMTP id BEC6D1BF34A for ; Thu, 13 Apr 2023 19:05:38 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id A3C8A408A6 for ; Thu, 13 Apr 2023 19:05:38 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org A3C8A408A6 X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BBQmtfmFgH5e for ; Thu, 13 Apr 2023 19:05:38 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org E4AB3400F2 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by smtp2.osuosl.org (Postfix) with ESMTPS id E4AB3400F2 for ; Thu, 13 Apr 2023 19:05:37 +0000 (UTC) Received: from mail-ed1-f70.google.com (mail-ed1-f70.google.com [209.85.208.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-670-eYBAeXiRPbqHcsu212fTgQ-1; Thu, 13 Apr 2023 15:05:35 -0400 X-MC-Unique: eYBAeXiRPbqHcsu212fTgQ-1 Received: by mail-ed1-f70.google.com with SMTP id j28-20020a508a9c000000b00504ee48e421so3656996edj.22 for ; Thu, 13 Apr 2023 12:05:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1681412734; x=1684004734; h=content-transfer-encoding:in-reply-to:references:to :content-language:subject:cc:user-agent:mime-version:date:message-id :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=UCBVyFd5BBmA+6Xv/IIgNhhtsz0B8DYXHt8AQVnFyEY=; b=OXCzxmyfVG7KtK1C0LMHRSmNdmV5DbyxHK3assycNU3Vr9P0xAVord8amFOp+DW7aI XdPsHytchWBVfF9KXTJpE1uHQxXxO229NnpD5gPvSl+uRP7w5F2pExmJjk+1n52xCwSA tkcBJNBZpVByrAFLyiJdq8O++8R4w5Fg+aMUpUiARE90f2vfCloaAxrzQ5kSKEbpu3tU S9RfngEG8dn5eIyf1lj+Y1Xh23Vm4aL8E11ispdHMFQnb2KnMLtqXXF6kKpkXWWV9LTl mBg0E7halrKr/MgcPcvi2/vJubT8YZgHGYWTw5mQC9cp0/ke5K0dbdaEL0nlD9yJ9gou ecrQ== X-Gm-Message-State: AAQBX9ckUGal1B9cgqrYQ6UqvV/KOR+wikt6oQ5uytEQkKG5De5w7eJo DlOn5ycNQ8GP3M6Wux4gdDgy5T0McHz+7iEuVXQXm12m/rlRZJMFFsLdKMFJ8bNxTZdtS/5PIK9 6PcXqdhpCKOv0M+0Fa5WtOgXtidvsAQ== X-Received: by 2002:a17:907:7783:b0:92b:f118:ef32 with SMTP id ky3-20020a170907778300b0092bf118ef32mr3344078ejc.48.1681412734064; Thu, 13 Apr 2023 12:05:34 -0700 (PDT) X-Google-Smtp-Source: AKy350b0NoeyqPTndxzzpsGhufBoItrSucdDKVSwz86SIeJfM9Bqvf0Y1jAxX92P52cAl7P9mNqd0A== X-Received: by 2002:a17:907:7783:b0:92b:f118:ef32 with SMTP id ky3-20020a170907778300b0092bf118ef32mr3344059ejc.48.1681412733732; Thu, 13 Apr 2023 12:05:33 -0700 (PDT) Received: from [192.168.42.222] (194-45-78-10.static.kviknet.net. [194.45.78.10]) by smtp.gmail.com with ESMTPSA id gz1-20020a170907a04100b0094a6ba1f5ccsm1368474ejc.22.2023.04.13.12.05.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 13 Apr 2023 12:05:33 -0700 (PDT) From: Jesper Dangaard Brouer X-Google-Original-From: Jesper Dangaard Brouer Message-ID: Date: Thu, 13 Apr 2023 21:05:32 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 To: Song Yoong Siang , Jesse Brandeburg , Tony Nguyen , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Maciej Fijalkowski , Vedang Patel , Jithu Joseph , Andre Guedes , Stanislav Fomichev References: <20230413151222.1864307-1-yoong.siang.song@intel.com> In-Reply-To: <20230413151222.1864307-1-yoong.siang.song@intel.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1681412736; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UCBVyFd5BBmA+6Xv/IIgNhhtsz0B8DYXHt8AQVnFyEY=; b=ADZ53R42VBZxh8v38I9Xot5FvqsXejzzFSD5/8ggefm2wP9Pw+WhRxmNjrmerEPI7wJ6zi 5D7weuwiYNx5XmDxC1mAjQNmOLPxpKMHkCzW8kftROq95hDsSVrjsBuoLVCyvMMW/Lvgi2 4jn3epuqvvN83ARin0EZJl5XVSK0Mns= X-Mailman-Original-Authentication-Results: smtp2.osuosl.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=ADZ53R42 Subject: Re: [Intel-wired-lan] [PATCH net 1/1] igc: read before write to SRRCTL register 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: xdp-hints@xdp-project.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, intel-wired-lan@lists.osuosl.org, brouer@redhat.com, bpf@vger.kernel.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 13/04/2023 17.12, Song Yoong Siang wrote: > igc_configure_rx_ring() function will be called as part of XDP program > setup. If Rx hardware timestamp is enabled prio to XDP program setup, > this timestamp enablement will be overwritten when buffer size is > written into SRRCTL register. > > Thus, this commit read the register value before write to SRRCTL > register. This commit is tested by using xdp_hw_metadata bpf selftest > tool. The tool enables Rx hardware timestamp and then attach XDP program > to igc driver. It will display hardware timestamp of UDP packet with > port number 9092. Below are detail of test steps and results. [...] > diff --git a/drivers/net/ethernet/intel/igc/igc_base.h b/drivers/net/ethernet/intel/igc/igc_base.h > index 7a992befca24..b95007d51d13 100644 > --- a/drivers/net/ethernet/intel/igc/igc_base.h > +++ b/drivers/net/ethernet/intel/igc/igc_base.h > @@ -87,8 +87,11 @@ union igc_adv_rx_desc { > #define IGC_RXDCTL_SWFLUSH 0x04000000 /* Receive Software Flush */ > > /* SRRCTL bit definitions */ > -#define IGC_SRRCTL_BSIZEPKT_SHIFT 10 /* Shift _right_ */ > -#define IGC_SRRCTL_BSIZEHDRSIZE_SHIFT 2 /* Shift _left_ */ > +#define IGC_SRRCTL_BSIZEPKT_MASK GENMASK(6, 0) > +#define IGC_SRRCTL_BSIZEPKT_SHIFT 10 /* Shift _right_ */ > +#define IGC_SRRCTL_BSIZEHDRSIZE_MASK GENMASK(13, 8) > +#define IGC_SRRCTL_BSIZEHDRSIZE_SHIFT 2 /* Shift _left_ */ > +#define IGC_SRRCTL_DESCTYPE_MASK GENMASK(27, 25) > #define IGC_SRRCTL_DESCTYPE_ADV_ONEBUF 0x02000000 > > #endif /* _IGC_BASE_H */ > diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c > index 25fc6c65209b..de7b21c2ccd6 100644 > --- a/drivers/net/ethernet/intel/igc/igc_main.c > +++ b/drivers/net/ethernet/intel/igc/igc_main.c > @@ -641,7 +641,10 @@ static void igc_configure_rx_ring(struct igc_adapter *adapter, > else > buf_size = IGC_RXBUFFER_2048; > > - srrctl = IGC_RX_HDR_LEN << IGC_SRRCTL_BSIZEHDRSIZE_SHIFT; > + srrctl = rd32(IGC_SRRCTL(reg_idx)); > + srrctl &= ~(IGC_SRRCTL_BSIZEPKT_MASK | IGC_SRRCTL_BSIZEHDRSIZE_MASK | > + IGC_SRRCTL_DESCTYPE_MASK); ^^ Please fix indention, moving IGC_SRRCTL_DESCTYPE_MASK such that it aligns with IGC_SRRCTL_BSIZEPKT_MASK. This make is easier for the eye to spot that it is part of the negation (~). > + srrctl |= IGC_RX_HDR_LEN << IGC_SRRCTL_BSIZEHDRSIZE_SHIFT; > srrctl |= buf_size >> IGC_SRRCTL_BSIZEPKT_SHIFT; > srrctl |= IGC_SRRCTL_DESCTYPE_ADV_ONEBUF; > _______________________________________________ Intel-wired-lan mailing list Intel-wired-lan@osuosl.org https://lists.osuosl.org/mailman/listinfo/intel-wired-lan