From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by dpdk.org (Postfix) with ESMTP id 1DC421B501 for ; Mon, 2 Jul 2018 18:52:17 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 Jul 2018 09:52:16 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,299,1526367600"; d="scan'208";a="63508327" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.83]) ([10.237.221.83]) by fmsmga002.fm.intel.com with ESMTP; 02 Jul 2018 09:52:13 -0700 From: Ferruh Yigit To: Marvin Liu , maxime.coquelin@redhat.com, tiwei.bie@intel.com Cc: zhihong.wang@intel.com, dev@dpdk.org References: <20180702135642.52577-1-yong.liu@intel.com> <20180702135642.52577-8-yong.liu@intel.com> <7ab59556-5719-e05b-ea1f-f94867d90b24@intel.com> Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <7ab59556-5719-e05b-ea1f-f94867d90b24@intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH v5 7/9] net/virtio: support in-order Rx and Tx 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: , X-List-Received-Date: Mon, 02 Jul 2018 16:52:19 -0000 On 7/2/2018 5:41 PM, Ferruh Yigit wrote: > On 7/2/2018 2:56 PM, Marvin Liu wrote: >> IN_ORDER Rx function depends on merge-able feature. Descriptors >> allocation and free will be done in bulk. >> >> Virtio dequeue logic: >> dequeue_burst_rx(burst mbufs) >> for (each mbuf b) { >> if (b need merge) { >> merge remained mbufs >> add merged mbuf to return mbufs list >> } else { >> add mbuf to return mbufs list >> } >> } >> if (last mbuf c need merge) { >> dequeue_burst_rx(required mbufs) >> merge last mbuf c >> } >> refill_avail_ring_bulk() >> update_avail_ring() >> return mbufs list >> >> IN_ORDER Tx function can support offloading features. Packets which >> matched "can_push" option will be handled by simple xmit function. Those >> packets can't match "can_push" will be handled by original xmit function >> with in-order flag. >> >> Virtio enqueue logic: >> xmit_cleanup(used descs) >> for (each xmit mbuf b) { >> if (b can inorder xmit) { >> add mbuf b to inorder burst list >> continue >> } else { >> xmit inorder burst list >> xmit mbuf b by original function >> } >> } >> if (inorder burst list not empty) { >> xmit inorder burst list >> } >> update_avail_ring() >> >> Signed-off-by: Marvin Liu >> Reviewed-by: Maxime Coquelin > > <...> > >> @@ -150,6 +188,83 @@ virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num) >> } >> } >> >> +/* Cleanup from completed inorder transmits. */ >> +static void >> +virtio_xmit_cleanup_inorder(struct virtqueue *vq, uint16_t num) >> +{ >> + uint16_t i, used_idx, desc_idx, last_idx; > > > Getting following build error [1], from code it looks like false positive, but > to get rid of the build error would it be OK to set initial value to "desc_idx"? I applied this while merging, if this is wrong please let me know, we can fix in next-net, Thanks. > > > [1] > .../dpdk/drivers/net/virtio/virtio_rxtx.c:195:24: error: ‘desc_idx’ may be used > uninitialized in this function [-Werror=maybe-uninitialized] > > > uint16_t i, used_idx, desc_idx, last_idx; > > > > ^~~~~~~~ >