Messages in this thread | | | From | Rusty Russell <> | Subject | Re: [PATCH net-next RFC 1/3] virtio: support for urgent descriptors | Date | Wed, 15 Oct 2014 16:10:02 +1030 |
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Jason Wang <jasowang@redhat.com> writes: > Below should be useful for some experiments Jason is doing. > I thought I'd send it out for early review/feedback. > > event idx feature allows us to defer interrupts until > a specific # of descriptors were used. > Sometimes it might be useful to get an interrupt after > a specific descriptor, regardless. > This adds a descriptor flag for this, and an API > to create an urgent output descriptor. > This is still an RFC: > we'll need a feature bit for drivers to detect this, > but we've run out of feature bits for virtio 0.X. > For experimentation purposes, drivers can assume > this is set, or add a driver-specific feature bit. > > Signed-off-by: Michael S. Tsirkin <mst@redhat.com> > Signed-off-by: Jason Wang <jasowang@redhat.com>
The new VRING_DESC_F_URGENT bit is theoretically nicer, but for networking (which tends to take packets in order) couldn't we just set the event counter to give us a tx interrupt at the packet we want?
Cheers, Rusty.
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