From 640b8a1c588b56349b3307d88459ea1cd86181fb Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= Date: Wed, 20 Jul 2022 08:59:28 +0200 Subject: [PATCH] virtio-net: Expose ctrl virtqueue logic MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This allows external vhost-net devices to modify the state of the VirtIO device model once the vhost-vdpa device has acknowledged the control commands. Signed-off-by: Eugenio Pérez Reviewed-by: Michael S. Tsirkin Signed-off-by: Jason Wang --- hw/net/virtio-net.c | 84 ++++++++++++++++++++-------------- include/hw/virtio/virtio-net.h | 4 ++ 2 files changed, 53 insertions(+), 35 deletions(-) diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index f83e96e4ce..dd0d056fde 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -1433,57 +1433,71 @@ static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, return VIRTIO_NET_OK; } -static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) +size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev, + const struct iovec *in_sg, unsigned in_num, + const struct iovec *out_sg, + unsigned out_num) { VirtIONet *n = VIRTIO_NET(vdev); struct virtio_net_ctrl_hdr ctrl; virtio_net_ctrl_ack status = VIRTIO_NET_ERR; - VirtQueueElement *elem; size_t s; struct iovec *iov, *iov2; - unsigned int iov_cnt; + + if (iov_size(in_sg, in_num) < sizeof(status) || + iov_size(out_sg, out_num) < sizeof(ctrl)) { + virtio_error(vdev, "virtio-net ctrl missing headers"); + return 0; + } + + iov2 = iov = g_memdup2(out_sg, sizeof(struct iovec) * out_num); + s = iov_to_buf(iov, out_num, 0, &ctrl, sizeof(ctrl)); + iov_discard_front(&iov, &out_num, sizeof(ctrl)); + if (s != sizeof(ctrl)) { + status = VIRTIO_NET_ERR; + } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { + status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, out_num); + } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { + status = virtio_net_handle_mac(n, ctrl.cmd, iov, out_num); + } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { + status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, out_num); + } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) { + status = virtio_net_handle_announce(n, ctrl.cmd, iov, out_num); + } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { + status = virtio_net_handle_mq(n, ctrl.cmd, iov, out_num); + } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { + status = virtio_net_handle_offloads(n, ctrl.cmd, iov, out_num); + } + + s = iov_from_buf(in_sg, in_num, 0, &status, sizeof(status)); + assert(s == sizeof(status)); + + g_free(iov2); + return sizeof(status); +} + +static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) +{ + VirtQueueElement *elem; for (;;) { + size_t written; elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); if (!elem) { break; } - if (iov_size(elem->in_sg, elem->in_num) < sizeof(status) || - iov_size(elem->out_sg, elem->out_num) < sizeof(ctrl)) { - virtio_error(vdev, "virtio-net ctrl missing headers"); + + written = virtio_net_handle_ctrl_iov(vdev, elem->in_sg, elem->in_num, + elem->out_sg, elem->out_num); + if (written > 0) { + virtqueue_push(vq, elem, written); + virtio_notify(vdev, vq); + g_free(elem); + } else { virtqueue_detach_element(vq, elem, 0); g_free(elem); break; } - - iov_cnt = elem->out_num; - iov2 = iov = g_memdup2(elem->out_sg, - sizeof(struct iovec) * elem->out_num); - s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); - iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); - if (s != sizeof(ctrl)) { - status = VIRTIO_NET_ERR; - } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { - status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); - } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { - status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); - } 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_ANNOUNCE) { - status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt); - } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { - status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); - } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { - status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt); - } - - s = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, sizeof(status)); - assert(s == sizeof(status)); - - virtqueue_push(vq, elem, sizeof(status)); - virtio_notify(vdev, vq); - g_free(iov2); - g_free(elem); } } diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h index cce1c554f7..ef234ffe7e 100644 --- a/include/hw/virtio/virtio-net.h +++ b/include/hw/virtio/virtio-net.h @@ -221,6 +221,10 @@ struct VirtIONet { struct EBPFRSSContext ebpf_rss; }; +size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev, + const struct iovec *in_sg, unsigned in_num, + const struct iovec *out_sg, + unsigned out_num); void virtio_net_set_netclient_name(VirtIONet *n, const char *name, const char *type);