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 5D606C350 for ; Wed, 1 Jul 2015 09:48:58 +0200 (CEST) Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga103.fm.intel.com with ESMTP; 01 Jul 2015 00:48:57 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,383,1432623600"; d="scan'208";a="738306906" Received: from shvmail01.sh.intel.com ([10.239.29.42]) by fmsmga001.fm.intel.com with ESMTP; 01 Jul 2015 00:48:56 -0700 Received: from shecgisg004.sh.intel.com (shecgisg004.sh.intel.com [10.239.29.89]) by shvmail01.sh.intel.com with ESMTP id t617msSl022780; Wed, 1 Jul 2015 15:48:54 +0800 Received: from shecgisg004.sh.intel.com (localhost [127.0.0.1]) by shecgisg004.sh.intel.com (8.13.6/8.13.6/SuSE Linux 0.8) with ESMTP id t617mqQg026770; Wed, 1 Jul 2015 15:48:54 +0800 Received: (from couyang@localhost) by shecgisg004.sh.intel.com (8.13.6/8.13.6/Submit) id t617mpwV026766; Wed, 1 Jul 2015 15:48:51 +0800 From: Ouyang Changchun To: dev@dpdk.org Date: Wed, 1 Jul 2015 15:48:50 +0800 Message-Id: <1435736930-26737-1-git-send-email-changchun.ouyang@intel.com> X-Mailer: git-send-email 1.7.12.2 Subject: [dpdk-dev] [PATCH] virtio: fix the vq size issue X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Jul 2015 07:48:58 -0000 This commit breaks virtio basic packets rx functionality: d78deadae4dca240e85054bf2d604a801676becc The QEMU use 256 as default vring size, also use this default value to calculate the virtio avail ring base address and used ring base address, and vhost in the backend use the ring base address to do packet IO. Virtio spec also says the queue size in PCI configuration is read-only, so virtio front end can't change it. just need use the read-only value to allocate space for vring and calculate the avail and used ring base address. Otherwise, the avail and used ring base address will be different between host and guest, accordingly, packet IO can't work normally. Signed-off-by: Changchun Ouyang --- drivers/net/virtio/virtio_ethdev.c | 14 +++----------- 1 file changed, 3 insertions(+), 11 deletions(-) diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c index fe5f9a1..d84de13 100644 --- a/drivers/net/virtio/virtio_ethdev.c +++ b/drivers/net/virtio/virtio_ethdev.c @@ -263,8 +263,6 @@ int virtio_dev_queue_setup(struct rte_eth_dev *dev, */ vq_size = VIRTIO_READ_REG_2(hw, VIRTIO_PCI_QUEUE_NUM); PMD_INIT_LOG(DEBUG, "vq_size: %d nb_desc:%d", vq_size, nb_desc); - if (nb_desc == 0) - nb_desc = vq_size; if (vq_size == 0) { PMD_INIT_LOG(ERR, "%s: virtqueue does not exist", __func__); return -EINVAL; @@ -275,15 +273,9 @@ int virtio_dev_queue_setup(struct rte_eth_dev *dev, return -EINVAL; } - if (nb_desc < vq_size) { - if (!rte_is_power_of_2(nb_desc)) { - PMD_INIT_LOG(ERR, - "nb_desc(%u) size is not powerof 2", - nb_desc); - return -EINVAL; - } - vq_size = nb_desc; - } + if (nb_desc != vq_size) + PMD_INIT_LOG(ERR, "Warning: nb_desc(%d) is not equal to vq size (%d), fall to vq size", + nb_desc, vq_size); if (queue_type == VTNET_RQ) { snprintf(vq_name, sizeof(vq_name), "port%d_rvq%d", -- 1.8.4.2