Re: [PATCH RFC 0/8] virtio: add guest MSI-X support

[Christian Borntraeger <borntraeger@de.ibm.com>]

Am Monday 27 April 2009 17:39:36 schrieb Michael S. Tsirkin:
> So we'll probably need to rename request_vqs to request_vectors,
> but we probably still need the driver to pass the number of
> vectors it wants to the transport. Right?

This might be a stupid idea, but would something like the following
be sufficient for you?

Index: linux-2.6/drivers/net/virtio_net.c
===================================================================
--- linux-2.6.orig/drivers/net/virtio_net.c
+++ linux-2.6/drivers/net/virtio_net.c
@@ -1021,6 +1021,7 @@ static unsigned int features[] = {
 static struct virtio_driver virtio_net = {
        .feature_table = features,
        .feature_table_size = ARRAY_SIZE(features),
+       .num_vq_max = 3,
        .driver.name =  KBUILD_MODNAME,
        .driver.owner = THIS_MODULE,
        .id_table =     id_table,
Index: linux-2.6/include/linux/virtio.h
===================================================================
--- linux-2.6.orig/include/linux/virtio.h
+++ linux-2.6/include/linux/virtio.h
@@ -110,6 +110,7 @@ struct virtio_driver {
        const struct virtio_device_id *id_table;
        const unsigned int *feature_table;
        unsigned int feature_table_size;
+       unsigned int num_vq_max;
        int (*probe)(struct virtio_device *dev);
        void (*remove)(struct virtio_device *dev);
        void (*config_changed)(struct virtio_device *dev);