From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id A5541A058A; Fri, 17 Apr 2020 17:10:41 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 83B611DFE1; Fri, 17 Apr 2020 17:10:41 +0200 (CEST) Received: from mail-lf1-f44.google.com (mail-lf1-f44.google.com [209.85.167.44]) by dpdk.org (Postfix) with ESMTP id 8057D1DEB1 for ; Fri, 17 Apr 2020 17:10:39 +0200 (CEST) Received: by mail-lf1-f44.google.com with SMTP id t11so2079152lfe.4 for ; Fri, 17 Apr 2020 08:10:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=k1/RQ9KN95dXpAIDu9bQjbJXFh8bkACvOdYREZrwrp8=; b=PZm9Z2s4ghKM3YDp81VZlf/+TdsAs98FzAG766cOTg7e6GW+4MQ7l9kFKCUvELZvoJ zGqPQFHskaF6627pXtvIMxTgtZwKhVDkIa60C5q5Vbi5jx93HhBydpSIpo9T18CS5Vkb jeLovPgpHK9qJO4G9zRzgyGS5RIJamB4VjtTTFPDHWUDHE0bQWD7gjC5tQOQOBzyRlzh FcRQITcq6ZhQqF0ApFbeUX41xX8wAwcFsxIMp/Ba5FuthA1/C2MXxxwCt2heu1lLfaxv 8hUOWDnBbuE9Ji1jOsPlzCieTYPtcNmRdDq5flDCtLFUXtqZ23qrKemSxrSN4KzfynnF R5rQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=k1/RQ9KN95dXpAIDu9bQjbJXFh8bkACvOdYREZrwrp8=; b=pByqipBWyMfCXii27Vpx9EU4NeUDpwO8ChgKe0qgpyB1LEbSJexDsWPRmQcYm71z8i dxDR1yF9m1EUJA4eI/O4MktuvmgT3Rb7Kvqtz7m2QD17cE+e2cu/xWZot9I+I9VfDmCV b1xnLUt7N9fv0GYBkwnr6MyWzZRbdxM4cYE0MzGPC1wHv482214cOBOXCWFMO0fe120N Kl+riy99z5nLm1TXR9FNpuTkJLDiYlmbvWqkWZNxsJksFgLA5efVR4iZ0veDFi5YFuXO CgipFbWBeAIRvc2KQC0tTSEPLzLRS0xW8jE6QwPbdbB1kAdtdRbqCLBgkRtCP5TBhRyh yMpg== X-Gm-Message-State: AGi0PuZCdV3kWAn9esEGoYitHn3ZNUFbp+sxg40qXs39ubXpU+Penx+W 9r7/UiHNpCFeCL4L2l94DpQ= X-Google-Smtp-Source: APiQypIzMEW2t0vHfSk/HMLasQnIpv0qAqRFfehutORvyDcN+5U9tQCFQgfv48hmRELs26vIb6EVqg== X-Received: by 2002:a19:f206:: with SMTP id q6mr2471007lfh.85.1587136238977; Fri, 17 Apr 2020 08:10:38 -0700 (PDT) Received: from Sovereign (broadband-37-110-65-23.ip.moscow.rt.ru. [37.110.65.23]) by smtp.gmail.com with ESMTPSA id g8sm19164940ljl.45.2020.04.17.08.10.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Apr 2020 08:10:37 -0700 (PDT) Date: Fri, 17 Apr 2020 18:10:36 +0300 From: Dmitry Kozlyuk To: Thomas Monjalon Cc: dev@dpdk.org, Harini Ramakrishnan , Omar Cardona , Dmitry Malloy , Narcisa Ana Maria Vasile , Pallavi Kadam , Ranjit Menon , Tal Shnaiderman , Fady Bader , Ophir Munk , Anatoly Burakov Message-ID: <20200417181036.7b2fe027@Sovereign> In-Reply-To: <6962862.uKWtJMOXK1@thomas> References: <4064679.AiC22s8V5E@thomas> <20200417024633.21d77a3b@Sovereign> <6962862.uKWtJMOXK1@thomas> X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-dev] [Minutes 04/15/2020] Bi-Weekly DPDK Windows Community Call X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" > > 4. Device can be VA-only with an onboard IOMMU (e.g. Mellanox NICs). > > Mellanox NICs work also with PA memory. IIRC, you told us there's something special with Mellanox NICs and IOMMU. Documentation says (https://doc.dpdk.org/guides/nics/mlx5.html): For security reasons and robustness, this driver only deals with virtual memory addresses. The way resources allocations are handled by the kernel, combined with hardware specifications that allow to handle virtual memory addresses directly, ensure that DPDK applications cannot access random physical memory (or memory that does not belong to the current process). > DMA_ADAPTER and DMA_IOMMU are kernel interfaces, without any userspace API? Correct. -- Dmitry Kozlyuk