From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by dpdk.space (Postfix) with ESMTP id C8DF0A00E6 for ; Tue, 19 Mar 2019 19:35:24 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 8DF962956; Tue, 19 Mar 2019 19:35:23 +0100 (CET) Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by dpdk.org (Postfix) with ESMTP id 0B3091B19 for ; Tue, 19 Mar 2019 19:35:21 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 19 Mar 2019 11:35:21 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,245,1549958400"; d="scan'208";a="308570146" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.46]) ([10.237.221.46]) by orsmga005.jf.intel.com with ESMTP; 19 Mar 2019 11:35:20 -0700 To: Yangchao Zhou , dev@dpdk.org References: <20190228073010.49716-1-zhouyates@gmail.com> <20190312092232.93640-1-zhouyates@gmail.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.5.3 MIME-Version: 1.0 In-Reply-To: <20190312092232.93640-1-zhouyates@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-dev] [PATCH v2] kni: fix possible kernel crash with va2pa 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" Message-ID: <20190319183519.Hcx5oJ2cVmNNNEj_-LShJu0f8zZB9ciuDo_d_6b7gsM@z> On 3/12/2019 9:22 AM, Yangchao Zhou wrote: > va2pa depends on the physical address and virtual address offset of > current mbuf. It may get the wrong physical address of next mbuf which > allocated in another hugepage segment. > > In rte_mempool_populate_default(), trying to allocate whole block of > contiguous memory could be failed. Then, it would reserve memory in > several memzones that have different physical address and virtual address > offsets. The rte_mempool_populate_default() is used by > rte_pktmbuf_pool_create(). > > Signed-off-by: Yangchao Zhou > --- > v2: Add an explanation that causes this problem. > Use m->next to store physical address. Overall code looks good to me, thanks for the work, it looks pretty clean. I would like to do some test before giving an ack. Meanwhile, can you please update kni documentation, to document for the mbufs sent to kernel has mbuf->next fields as physical address. It is OK to send as a new version of the patch with documentation. Thanks, ferruh