+/*
+ * Should be called only after device is paused.
+ */
+int
+virtio_inject_pkts(struct rte_eth_dev *dev, struct rte_mbuf **tx_pkts,
+ int nb_pkts)
+{
+ struct virtio_hw *hw = dev->data->dev_private;
+ struct virtnet_tx *txvq = dev->data->tx_queues[0];
+ int ret;
+
+ hw->inject_pkts = tx_pkts;
+ ret = dev->tx_pkt_burst(txvq, tx_pkts, nb_pkts);
+ hw->inject_pkts = NULL;
+
+ return ret;
+}
+
+static void
+virtio_notify_peers(struct rte_eth_dev *dev)
+{
+ struct virtio_hw *hw = dev->data->dev_private;
+ struct virtnet_rx *rxvq;
+ struct rte_mbuf *rarp_mbuf;
+
+ if (!dev->data->rx_queues)
+ return;
+
+ rxvq = dev->data->rx_queues[0];
+ if (!rxvq)
+ return;
+
+ rarp_mbuf = rte_net_make_rarp_packet(rxvq->mpool,
+ (struct rte_ether_addr *)hw->mac_addr);
+ if (rarp_mbuf == NULL) {
+ PMD_DRV_LOG(ERR, "failed to make RARP packet.");
+ return;
+ }
+
+ /* If virtio port just stopped, no need to send RARP */
+ if (virtio_dev_pause(dev) < 0) {
+ rte_pktmbuf_free(rarp_mbuf);
+ return;
+ }
+
+ virtio_inject_pkts(dev, &rarp_mbuf, 1);
+ virtio_dev_resume(dev);
+}
+
+static void
+virtio_ack_link_announce(struct rte_eth_dev *dev)
+{
+ struct virtio_hw *hw = dev->data->dev_private;
+ struct virtio_pmd_ctrl ctrl;
+
+ ctrl.hdr.class = VIRTIO_NET_CTRL_ANNOUNCE;
+ ctrl.hdr.cmd = VIRTIO_NET_CTRL_ANNOUNCE_ACK;
+
+ virtio_send_command(hw->cvq, &ctrl, NULL, 0);
+}
+
+/*
+ * Process virtio config changed interrupt. Call the callback
+ * if link state changed, generate gratuitous RARP packet if
+ * the status indicates an ANNOUNCE.
+ */
+void
+virtio_interrupt_handler(void *param)
+{
+ struct rte_eth_dev *dev = param;
+ struct virtio_hw *hw = dev->data->dev_private;
+ uint8_t isr;
+ uint16_t status;
+
+ /* Read interrupt status which clears interrupt */
+ isr = virtio_get_isr(hw);
+ PMD_DRV_LOG(INFO, "interrupt status = %#x", isr);
+
+ if (virtio_intr_unmask(dev) < 0)
+ PMD_DRV_LOG(ERR, "interrupt enable failed");
+
+ if (isr & VIRTIO_ISR_CONFIG) {
+ if (virtio_dev_link_update(dev, 0) == 0)
+ rte_eth_dev_callback_process(dev,
+ RTE_ETH_EVENT_INTR_LSC,
+ NULL);
+
+ if (virtio_with_feature(hw, VIRTIO_NET_F_STATUS)) {
+ virtio_read_dev_config(hw,
+ offsetof(struct virtio_net_config, status),
+ &status, sizeof(status));
+ if (status & VIRTIO_NET_S_ANNOUNCE) {
+ virtio_notify_peers(dev);
+ if (hw->cvq)
+ virtio_ack_link_announce(dev);
+ }
+ }
+ }
+}
+
+/* set rx and tx handlers according to what is supported */
+static void
+set_rxtx_funcs(struct rte_eth_dev *eth_dev)
+{
+ struct virtio_hw *hw = eth_dev->data->dev_private;
+
+ eth_dev->tx_pkt_prepare = virtio_xmit_pkts_prepare;
+ if (virtio_with_packed_queue(hw)) {
+ PMD_INIT_LOG(INFO,
+ "virtio: using packed ring %s Tx path on port %u",
+ hw->use_vec_tx ? "vectorized" : "standard",
+ eth_dev->data->port_id);
+ if (hw->use_vec_tx)
+ eth_dev->tx_pkt_burst = virtio_xmit_pkts_packed_vec;
+ else
+ eth_dev->tx_pkt_burst = virtio_xmit_pkts_packed;
+ } else {
+ if (hw->use_inorder_tx) {
+ PMD_INIT_LOG(INFO, "virtio: using inorder Tx path on port %u",
+ eth_dev->data->port_id);
+ eth_dev->tx_pkt_burst = virtio_xmit_pkts_inorder;
+ } else {
+ PMD_INIT_LOG(INFO, "virtio: using standard Tx path on port %u",
+ eth_dev->data->port_id);
+ eth_dev->tx_pkt_burst = virtio_xmit_pkts;
+ }
+ }
+
+ if (virtio_with_packed_queue(hw)) {
+ if (hw->use_vec_rx) {
+ PMD_INIT_LOG(INFO,
+ "virtio: using packed ring vectorized Rx path on port %u",
+ eth_dev->data->port_id);
+ eth_dev->rx_pkt_burst =
+ &virtio_recv_pkts_packed_vec;
+ } else if (virtio_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
+ PMD_INIT_LOG(INFO,
+ "virtio: using packed ring mergeable buffer Rx path on port %u",
+ eth_dev->data->port_id);
+ eth_dev->rx_pkt_burst =
+ &virtio_recv_mergeable_pkts_packed;
+ } else {
+ PMD_INIT_LOG(INFO,
+ "virtio: using packed ring standard Rx path on port %u",
+ eth_dev->data->port_id);
+ eth_dev->rx_pkt_burst = &virtio_recv_pkts_packed;
+ }
+ } else {
+ if (hw->use_vec_rx) {
+ PMD_INIT_LOG(INFO, "virtio: using vectorized Rx path on port %u",
+ eth_dev->data->port_id);
+ eth_dev->rx_pkt_burst = virtio_recv_pkts_vec;
+ } else if (hw->use_inorder_rx) {
+ PMD_INIT_LOG(INFO,
+ "virtio: using inorder Rx path on port %u",
+ eth_dev->data->port_id);
+ eth_dev->rx_pkt_burst = &virtio_recv_pkts_inorder;
+ } else if (virtio_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
+ PMD_INIT_LOG(INFO,
+ "virtio: using mergeable buffer Rx path on port %u",
+ eth_dev->data->port_id);
+ eth_dev->rx_pkt_burst = &virtio_recv_mergeable_pkts;
+ } else {
+ PMD_INIT_LOG(INFO, "virtio: using standard Rx path on port %u",
+ eth_dev->data->port_id);
+ eth_dev->rx_pkt_burst = &virtio_recv_pkts;
+ }
+ }
+
+}
+
+/* Only support 1:1 queue/interrupt mapping so far.
+ * TODO: support n:1 queue/interrupt mapping when there are limited number of