From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by dpdk.org (Postfix) with ESMTP id 8F34D91AB for ; Wed, 21 Oct 2015 05:48:07 +0200 (CEST) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP; 20 Oct 2015 20:48:07 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.17,709,1437462000"; d="scan'208";a="831786552" Received: from yliu-dev.sh.intel.com ([10.239.66.49]) by fmsmga002.fm.intel.com with ESMTP; 20 Oct 2015 20:48:06 -0700 From: Yuanhan Liu To: dev@dpdk.org Date: Wed, 21 Oct 2015 11:48:11 +0800 Message-Id: <1445399294-18826-6-git-send-email-yuanhan.liu@linux.intel.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1445399294-18826-1-git-send-email-yuanhan.liu@linux.intel.com> References: <1445399294-18826-1-git-send-email-yuanhan.liu@linux.intel.com> Cc: "Michael S. Tsirkin" , marcel@redhat.com, Changchun Ouyang Subject: [dpdk-dev] [PATCH v7 5/8] virtio: fix deadloop due to reading virtio_net_config incorrectly 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, 21 Oct 2015 03:48:08 -0000 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 wrong config reading results to a dead loop at virtio_send_command() while starting testpmd. The right way to go is to read related config bytes when corresponding feature is set, which is exactly what this patch does. Fixes: 823ad647950a ("virtio: support multiple queues") Signed-off-by: Changchun Ouyang Signed-off-by: Yuanhan Liu Acked-by: Flavio Leitner --- v7: commit log fixes 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 147aca1..a654168 100644 --- a/drivers/net/virtio/virtio_ethdev.c +++ b/drivers/net/virtio/virtio_ethdev.c @@ -1163,7 +1163,6 @@ 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)); @@ -1222,8 +1221,14 @@ 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"); @@ -1231,15 +1236,16 @@ 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