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 130F4A3168 for ; Wed, 16 Oct 2019 12:02:31 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id CC35E1E8E0; Wed, 16 Oct 2019 12:02:30 +0200 (CEST) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id 15ED51BF01 for ; Wed, 16 Oct 2019 12:02:30 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7538D10C0943; Wed, 16 Oct 2019 10:02:29 +0000 (UTC) Received: from [10.36.112.44] (ovpn-112-44.ams2.redhat.com [10.36.112.44]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 9928519C68; Wed, 16 Oct 2019 10:02:23 +0000 (UTC) To: Flavio Leitner , dev@dpdk.org Cc: Ilya Maximets , Shahaf Shuler , David Marchand , Tiwei Bie , Obrembski MichalX , Stokes Ian References: <20191015161727.32570-1-fbl@sysclose.org> <20191015185951.6295-1-fbl@sysclose.org> From: Maxime Coquelin Autocrypt: addr=maxime.coquelin@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.0 MIME-Version: 1.0 In-Reply-To: <20191015185951.6295-1-fbl@sysclose.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.66]); Wed, 16 Oct 2019 10:02:29 +0000 (UTC) Subject: Re: [dpdk-dev] [PATCH v5] vhost: add support for large buffers 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" Hi Flavio, On 10/15/19 8:59 PM, Flavio Leitner wrote: > The rte_vhost_dequeue_burst supports two ways of dequeuing data. > If the data fits into a buffer, then all data is copied and a > single linear buffer is returned. Otherwise it allocates > additional mbufs and chains them together to return a multiple > segments mbuf. > > While that covers most use cases, it forces applications that > need to work with larger data sizes to support multiple segments > mbufs. The non-linear characteristic brings complexity and > performance implications to the application. > > To resolve the issue, add support to attach external buffer > to a pktmbuf and let the host provide during registration if > attaching an external buffer to pktmbuf is supported and if > only linear buffer are supported. > > Signed-off-by: Flavio Leitner > --- > doc/guides/prog_guide/vhost_lib.rst | 35 +++++++++ > lib/librte_vhost/rte_vhost.h | 4 + > lib/librte_vhost/socket.c | 22 ++++++ > lib/librte_vhost/vhost.c | 22 ++++++ > lib/librte_vhost/vhost.h | 4 + > lib/librte_vhost/virtio_net.c | 109 ++++++++++++++++++++++++---- > 6 files changed, 182 insertions(+), 14 deletions(-) > > - Changelog: > v5: > - fixed to destroy mutex if incompatible flags > v4: > - allow to use pktmbuf if there is exact space > - removed log message if the buffer is too big > - fixed the length to include align padding > - free allocated buf if shinfo fails > v3: > - prevent the new features to be used with zero copy > - fixed sizeof() usage > - fixed log msg indentation > - removed/replaced asserts > - used the correct virt2iova function > - fixed the patch's title > - OvS PoC code: > https://github.com/fleitner/ovs/tree/rte_malloc-v3 > v2: > - Used rte_malloc() instead of another mempool as suggested by Shahaf. > - Added the documentation section. > - Using driver registration to negotiate the features. > - OvS PoC code: > https://github.com/fleitner/ovs/commit/8fc197c40b1d4fda331686a7b919e9e2b670dda7 > I went through the patch, and it looks good to me. I appreciate the fact that there is no rte_vhost_dequeue_burst API change. Reviewed-by: Maxime Coquelin Thanks, Maxime