C++ (Cpp) tap_read_packet Examples

Example #1

File: tap.c Project: AbnerChang/RiscVQemuPcat

static void tap_send(void *opaque)
{
    TAPState *s = opaque;
    int size;

    while (qemu_can_send_packet(&s->nc)) {
        uint8_t *buf = s->buf;

        size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
        if (size <= 0) {
            break;
        }

        if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
            buf  += s->host_vnet_hdr_len;
            size -= s->host_vnet_hdr_len;
        }

        size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed);
        if (size == 0) {
            tap_read_poll(s, false);
            break;
        } else if (size < 0) {
            break;
        }
    }
}

Example #2

File: tap.c Project: PennPanda/qemu

static void tap_send(void *opaque)
{
    TAPState *s = opaque;
    int size;
    int packets = 0;

    while (true) {
        uint8_t *buf = s->buf;

        size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
        if (size <= 0) {
            break;
        }

        if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
            buf  += s->host_vnet_hdr_len;
            size -= s->host_vnet_hdr_len;
        }

        size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed);
        if (size == 0) {
            tap_read_poll(s, false);
            break;
        } else if (size < 0) {
            break;
        }

        /*
         * When the host keeps receiving more packets while tap_send() is
         * running we can hog the QEMU global mutex.  Limit the number of
         * packets that are processed per tap_send() callback to prevent
         * stalling the guest.
         */
        packets++;
        if (packets >= 50) {
            break;
        }
    }
}

Example #3

File: tap.c Project: TheLoneRanger14/vmxray

static void tap_send(void *opaque)
{
    TAPState *s = opaque;
    int size;

    do {
        uint8_t *buf = s->buf;

        size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
        if (size <= 0) {
            break;
        }

        if (s->has_vnet_hdr && !s->using_vnet_hdr) {
            buf  += sizeof(struct virtio_net_hdr);
            size -= sizeof(struct virtio_net_hdr);
        }

        size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed);
        if (size == 0) {
            tap_read_poll(s, 0);
        }
    } while (size > 0 && qemu_can_send_packet(&s->nc));
}