From f8f7c533e20d1681feeb665109301151bdb739b4 Mon Sep 17 00:00:00 2001 From: Jason Wang Date: Wed, 6 Mar 2013 13:50:27 +0800 Subject: [PATCH] virtio-net: remove layout assumptions for mq ctrl Following commit 921ac5d0f3a0df869db5ce4edf752f51d8b1596a (virtio-net: remove layout assumptions for ctrl vq), this patch makes multiqueue ctrl handling not rely on the layout of descriptors. Signed-off-by: Jason Wang Signed-off-by: Michael S. Tsirkin --- hw/virtio-net.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/hw/virtio-net.c b/hw/virtio-net.c index 8c9d8713f3f3..45905573524b 100644 --- a/hw/virtio-net.c +++ b/hw/virtio-net.c @@ -578,13 +578,14 @@ static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, } static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, - VirtQueueElement *elem) + struct iovec *iov, unsigned int iov_cnt) { - struct virtio_net_ctrl_mq s; + struct virtio_net_ctrl_mq mq; + size_t s; + uint16_t queues; - if (elem->out_num != 2 || - elem->out_sg[1].iov_len != sizeof(struct virtio_net_ctrl_mq)) { - error_report("virtio-net ctrl invalid steering command"); + s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); + if (s != sizeof(mq)) { return VIRTIO_NET_ERR; } @@ -592,16 +593,16 @@ static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, return VIRTIO_NET_ERR; } - memcpy(&s, elem->out_sg[1].iov_base, sizeof(struct virtio_net_ctrl_mq)); + queues = lduw_p(&mq.virtqueue_pairs); - if (s.virtqueue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || - s.virtqueue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || - s.virtqueue_pairs > n->max_queues || + if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || + queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || + queues > n->max_queues || !n->multiqueue) { return VIRTIO_NET_ERR; } - n->curr_queues = s.virtqueue_pairs; + n->curr_queues = queues; /* stop the backend before changing the number of queues to avoid handling a * disabled queue */ virtio_net_set_status(&n->vdev, n->vdev.status); @@ -639,7 +640,7 @@ static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { - status = virtio_net_handle_mq(n, ctrl.cmd, &elem); + status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); } s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status));