From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dispatch1-us1.ppe-hosted.com (dispatch1-us1.ppe-hosted.com [67.231.154.164]) by dpdk.org (Postfix) with ESMTP id 1B9991B8EB; Thu, 1 Feb 2018 07:54:46 +0100 (CET) X-Virus-Scanned: Proofpoint Essentials engine Received: from webmail.solarflare.com (uk.solarflare.com [193.34.186.16]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1-us4.ppe-hosted.com (Proofpoint Essentials ESMTP Server) with ESMTPS id C816328005C; Thu, 1 Feb 2018 06:54:44 +0000 (UTC) Received: from [192.168.38.17] (84.52.114.114) by ukex01.SolarFlarecom.com (10.17.10.4) with Microsoft SMTP Server (TLS) id 15.0.1044.25; Thu, 1 Feb 2018 06:54:39 +0000 To: santosh , Olivier Matz CC: , , References: <1511539591-20966-1-git-send-email-arybchenko@solarflare.com> <1516713372-10572-1-git-send-email-arybchenko@solarflare.com> <1516713372-10572-2-git-send-email-arybchenko@solarflare.com> <20180131164504.cnfgfwo2x3ftxnaj@platinum> From: Andrew Rybchenko Message-ID: Date: Thu, 1 Feb 2018 09:54:35 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.2 MIME-Version: 1.0 In-Reply-To: Content-Language: en-GB X-Originating-IP: [84.52.114.114] X-ClientProxiedBy: ocex03.SolarFlarecom.com (10.20.40.36) To ukex01.SolarFlarecom.com (10.17.10.4) X-TM-AS-Product-Ver: SMEX-11.0.0.1191-8.100.1062-23634.003 X-TM-AS-Result: No--10.071300-0.000000-31 X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-MDID: 1517468085-MMhpHNZJXAYM Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit X-Content-Filtered-By: Mailman/MimeDel 2.1.15 Subject: Re: [dpdk-stable] [RFC v2 01/17] mempool: fix phys contig check if populate default skipped X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Feb 2018 06:54:46 -0000 On 02/01/2018 08:05 AM, santosh wrote: > On Wednesday 31 January 2018 10:15 PM, Olivier Matz wrote: >> On Tue, Jan 23, 2018 at 01:15:56PM +0000, Andrew Rybchenko wrote: >>> There is not specified dependency between rte_mempool_populate_default() >>> and rte_mempool_populate_iova(). So, the second should not rely on the >>> fact that the first adds capability flags to the mempool flags. >>> >>> Fixes: 65cf769f5e6a ("mempool: detect physical contiguous objects") >>> Cc: stable@dpdk.org >>> >>> Signed-off-by: Andrew Rybchenko >> Looks good to me. I agree it's strange that the mp->flags are >> updated with capabilities only in rte_mempool_populate_default(). >> I see that this behavior is removed later in the patchset since the >> get_capa() is removed! >> >> However maybe this single patch could go in 18.02. >> +Santosh +Jerin since it's mostly about Octeon. > rte_mempool_xmem_size should return correct size if MEMPOOL_F_CAPA_BLK_ALIGNED_OBJECTS flag > is set in 'mp->flags'. Thats why _ops_get_capabilities() called in _populate_default() but not > at _populate_iova(). > I think, this 'alone' patch may break octeontx mempool. The patch does not touch rte_mempool_populate_default(). _ops_get_capabilities() is still called there before rte_mempool_xmem_size(). The theoretical problem which the patch tries to fix is the case when rte_mempool_populate_default() is not called at all. I.e. application calls _ops_get_capabilities() to get flags, then, together with mp->flags, calls rte_mempool_xmem_size() directly, allocates calculated amount of memory and calls _populate_iova(). Since later patches of the series reconsider memory size calculation etc, it is up to you if it makes sense to apply it in 18.02 as a fix.