--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/symbian-qemu-0.9.1-12/qemu-symbian-svp/hw/virtio-net.c Fri Jul 31 15:01:17 2009 +0100
@@ -0,0 +1,325 @@
+/*
+ * Virtio Network Device
+ *
+ * Copyright IBM, Corp. 2007
+ *
+ * Authors:
+ * Anthony Liguori <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "virtio.h"
+#include "net.h"
+#include "qemu-timer.h"
+#include "virtio-net.h"
+
+typedef struct VirtIONet
+{
+ VirtIODevice vdev;
+ uint8_t mac[6];
+ VirtQueue *rx_vq;
+ VirtQueue *tx_vq;
+ VLANClientState *vc;
+ QEMUTimer *tx_timer;
+ int tx_timer_active;
+ int mergeable_rx_bufs;
+} VirtIONet;
+
+/* TODO
+ * - we could suppress RX interrupt if we were so inclined.
+ */
+
+static VirtIONet *to_virtio_net(VirtIODevice *vdev)
+{
+ return (VirtIONet *)vdev;
+}
+
+static void virtio_net_update_config(VirtIODevice *vdev, uint8_t *config)
+{
+ VirtIONet *n = to_virtio_net(vdev);
+ struct virtio_net_config netcfg;
+
+ memcpy(netcfg.mac, n->mac, 6);
+ memcpy(config, &netcfg, sizeof(netcfg));
+}
+
+static uint32_t virtio_net_get_features(VirtIODevice *vdev)
+{
+ uint32_t features = (1 << VIRTIO_NET_F_MAC);
+
+ return features;
+}
+
+static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
+{
+ VirtIONet *n = to_virtio_net(vdev);
+
+ n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
+}
+
+/* RX */
+
+static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
+{
+}
+
+static int do_virtio_net_can_receive(VirtIONet *n, int bufsize)
+{
+ if (!virtio_queue_ready(n->rx_vq) ||
+ !(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
+ return 0;
+
+ if (virtio_queue_empty(n->rx_vq) ||
+ (n->mergeable_rx_bufs &&
+ !virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
+ virtio_queue_set_notification(n->rx_vq, 1);
+ return 0;
+ }
+
+ virtio_queue_set_notification(n->rx_vq, 0);
+ return 1;
+}
+
+static int virtio_net_can_receive(void *opaque)
+{
+ VirtIONet *n = opaque;
+
+ return do_virtio_net_can_receive(n, VIRTIO_NET_MAX_BUFSIZE);
+}
+
+static int iov_fill(struct iovec *iov, int iovcnt, const void *buf, int count)
+{
+ int offset, i;
+
+ offset = i = 0;
+ while (offset < count && i < iovcnt) {
+ int len = MIN(iov[i].iov_len, count - offset);
+ memcpy(iov[i].iov_base, buf + offset, len);
+ offset += len;
+ i++;
+ }
+
+ return offset;
+}
+
+static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt,
+ const void *buf, size_t size, size_t hdr_len)
+{
+ struct virtio_net_hdr *hdr = iov[0].iov_base;
+ int offset = 0;
+
+ hdr->flags = 0;
+ hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
+
+ /* We only ever receive a struct virtio_net_hdr from the tapfd,
+ * but we may be passing along a larger header to the guest.
+ */
+ iov[0].iov_base += hdr_len;
+ iov[0].iov_len -= hdr_len;
+
+ return offset;
+}
+
+static void virtio_net_receive(void *opaque, const uint8_t *buf, int size)
+{
+ VirtIONet *n = opaque;
+ struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL;
+ size_t hdr_len, offset, i;
+
+ if (!do_virtio_net_can_receive(n, size))
+ return;
+
+ /* hdr_len refers to the header we supply to the guest */
+ hdr_len = n->mergeable_rx_bufs ?
+ sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
+
+ offset = i = 0;
+
+ while (offset < size) {
+ VirtQueueElement elem;
+ int len, total;
+ struct iovec sg[VIRTQUEUE_MAX_SIZE];
+
+ len = total = 0;
+
+ if ((i != 0 && !n->mergeable_rx_bufs) ||
+ virtqueue_pop(n->rx_vq, &elem) == 0) {
+ if (i == 0)
+ return;
+ fprintf(stderr, "virtio-net truncating packet\n");
+ exit(1);
+ }
+
+ if (elem.in_num < 1) {
+ fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
+ exit(1);
+ }
+
+ if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) {
+ fprintf(stderr, "virtio-net header not in first element\n");
+ exit(1);
+ }
+
+ memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num);
+
+ if (i == 0) {
+ if (n->mergeable_rx_bufs)
+ mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base;
+
+ offset += receive_header(n, sg, elem.in_num,
+ buf + offset, size - offset, hdr_len);
+ total += hdr_len;
+ }
+
+ /* copy in packet. ugh */
+ len = iov_fill(sg, elem.in_num,
+ buf + offset, size - offset);
+ total += len;
+
+ /* signal other side */
+ virtqueue_fill(n->rx_vq, &elem, total, i++);
+
+ offset += len;
+ }
+
+ if (mhdr)
+ mhdr->num_buffers = i;
+
+ virtqueue_flush(n->rx_vq, i);
+ virtio_notify(&n->vdev, n->rx_vq);
+}
+
+/* TX */
+static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
+{
+ VirtQueueElement elem;
+ int has_vnet_hdr = 0;
+
+ if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
+ return;
+
+ while (virtqueue_pop(vq, &elem)) {
+ ssize_t len = 0;
+ unsigned int out_num = elem.out_num;
+ struct iovec *out_sg = &elem.out_sg[0];
+ unsigned hdr_len;
+
+ /* hdr_len refers to the header received from the guest */
+ hdr_len = n->mergeable_rx_bufs ?
+ sizeof(struct virtio_net_hdr_mrg_rxbuf) :
+ sizeof(struct virtio_net_hdr);
+
+ if (out_num < 1 || out_sg->iov_len != hdr_len) {
+ fprintf(stderr, "virtio-net header not in first element\n");
+ exit(1);
+ }
+
+ /* ignore the header if GSO is not supported */
+ if (!has_vnet_hdr) {
+ out_num--;
+ out_sg++;
+ len += hdr_len;
+ } else if (n->mergeable_rx_bufs) {
+ /* tapfd expects a struct virtio_net_hdr */
+ hdr_len -= sizeof(struct virtio_net_hdr);
+ out_sg->iov_len -= hdr_len;
+ len += hdr_len;
+ }
+
+ len += qemu_sendv_packet(n->vc, out_sg, out_num);
+
+ virtqueue_push(vq, &elem, len);
+ virtio_notify(&n->vdev, vq);
+ }
+}
+
+static void virtio_net_handle_tx(VirtIODevice *vdev, VirtQueue *vq)
+{
+ VirtIONet *n = to_virtio_net(vdev);
+
+ if (n->tx_timer_active) {
+ virtio_queue_set_notification(vq, 1);
+ qemu_del_timer(n->tx_timer);
+ n->tx_timer_active = 0;
+ virtio_net_flush_tx(n, vq);
+ } else {
+ qemu_mod_timer(n->tx_timer,
+ qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
+ n->tx_timer_active = 1;
+ virtio_queue_set_notification(vq, 0);
+ }
+}
+
+static void virtio_net_tx_timer(void *opaque)
+{
+ VirtIONet *n = opaque;
+
+ n->tx_timer_active = 0;
+
+ /* Just in case the driver is not ready on more */
+ if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
+ return;
+
+ virtio_queue_set_notification(n->tx_vq, 1);
+ virtio_net_flush_tx(n, n->tx_vq);
+}
+
+static void virtio_net_save(QEMUFile *f, void *opaque)
+{
+ VirtIONet *n = opaque;
+
+ virtio_save(&n->vdev, f);
+
+ qemu_put_buffer(f, n->mac, 6);
+ qemu_put_be32(f, n->tx_timer_active);
+}
+
+static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
+{
+ VirtIONet *n = opaque;
+
+ if (version_id != 1)
+ return -EINVAL;
+
+ virtio_load(&n->vdev, f);
+
+ qemu_get_buffer(f, n->mac, 6);
+ n->tx_timer_active = qemu_get_be32(f);
+
+ if (n->tx_timer_active) {
+ qemu_mod_timer(n->tx_timer,
+ qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
+ }
+
+ return 0;
+}
+
+void virtio_net_init(VirtIOBindFn bind, void *bind_arg, NICInfo *nd)
+{
+ VirtIONet *n;
+ static int virtio_net_id;
+
+ n = (VirtIONet *)bind(bind_arg, "virtio-net", 0, VIRTIO_ID_NET,
+ 6, sizeof(VirtIONet));
+ if (!n)
+ return;
+
+ n->vdev.get_config = virtio_net_update_config;
+ n->vdev.get_features = virtio_net_get_features;
+ n->vdev.set_features = virtio_net_set_features;
+ n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
+ n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
+ memcpy(n->mac, nd->macaddr, 6);
+ n->vc = qemu_new_vlan_client(nd->vlan, virtio_net_receive,
+ virtio_net_can_receive, n);
+
+ n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n);
+ n->tx_timer_active = 0;
+ n->mergeable_rx_bufs = 0;
+
+ register_savevm("virtio-net", virtio_net_id++, 1,
+ virtio_net_save, virtio_net_load, n);
+}