From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yuanhan Liu Subject: [PATCH v6 06/13] virtio: read virtio_net_config correctly Date: Fri, 9 Oct 2015 13:46:05 +0800 Message-ID: <1444369572-1157-7-git-send-email-yuanhan.liu@linux.intel.com> References: <1444369572-1157-1-git-send-email-yuanhan.liu@linux.intel.com> Cc: "Michael S. Tsirkin" , marcel@redhat.com To: dev@dpdk.org Return-path: Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by dpdk.org (Postfix) with ESMTP id 7C8478E6C for ; Fri, 9 Oct 2015 07:46:15 +0200 (CEST) In-Reply-To: <1444369572-1157-1-git-send-email-yuanhan.liu@linux.intel.com> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" From: Changchun Ouyang The old code adjusts the config bytes we want to read depending on what kind of features we have, but we later cast the entire buf we read with "struct virtio_net_config", which is obviously wrong. The right way to go is to read related config bytes when corresponding feature is set, which is exactly what this patch does. Signed-off-by: Changchun Ouyang Signed-off-by: Yuanhan Liu --- v6: read mac unconditionally. --- drivers/net/virtio/virtio_ethdev.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c index 465d3cd..e6aa1f7 100644 --- a/drivers/net/virtio/virtio_ethdev.c +++ b/drivers/net/virtio/virtio_ethdev.c @@ -1162,7 +1162,6 @@ eth_virtio_dev_init(struct rte_eth_dev *eth_dev) struct virtio_hw *hw = eth_dev->data->dev_private; struct virtio_net_config *config; struct virtio_net_config local_config; - uint32_t offset_conf = sizeof(config->mac); struct rte_pci_device *pci_dev; RTE_BUILD_BUG_ON(RTE_PKTMBUF_HEADROOM < sizeof(struct virtio_net_hdr)); @@ -1221,8 +1220,14 @@ eth_virtio_dev_init(struct rte_eth_dev *eth_dev) if (vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_VQ)) { config = &local_config; + vtpci_read_dev_config(hw, + offsetof(struct virtio_net_config, mac), + &config->mac, sizeof(config->mac)); + if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) { - offset_conf += sizeof(config->status); + vtpci_read_dev_config(hw, + offsetof(struct virtio_net_config, status), + &config->status, sizeof(config->status)); } else { PMD_INIT_LOG(DEBUG, "VIRTIO_NET_F_STATUS is not supported"); @@ -1230,15 +1235,16 @@ eth_virtio_dev_init(struct rte_eth_dev *eth_dev) } if (vtpci_with_feature(hw, VIRTIO_NET_F_MQ)) { - offset_conf += sizeof(config->max_virtqueue_pairs); + vtpci_read_dev_config(hw, + offsetof(struct virtio_net_config, max_virtqueue_pairs), + &config->max_virtqueue_pairs, + sizeof(config->max_virtqueue_pairs)); } else { PMD_INIT_LOG(DEBUG, "VIRTIO_NET_F_MQ is not supported"); config->max_virtqueue_pairs = 1; } - vtpci_read_dev_config(hw, 0, (uint8_t *)config, offset_conf); - hw->max_rx_queues = (VIRTIO_MAX_RX_QUEUES < config->max_virtqueue_pairs) ? VIRTIO_MAX_RX_QUEUES : config->max_virtqueue_pairs; -- 1.9.0