On Wed, Jul 11, 2018 at 10:27:09AM +0800, Tiwei Bie wrote: > This commit introduces the support (without EVENT_IDX) for > packed ring. > > Signed-off-by: Tiwei Bie <[email protected]> > --- > drivers/virtio/virtio_ring.c | 495 ++++++++++++++++++++++++++++++++++- > 1 file changed, 487 insertions(+), 8 deletions(-) > > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c > index c4f8abc7445a..f317b485ba54 100644 > --- a/drivers/virtio/virtio_ring.c > +++ b/drivers/virtio/virtio_ring.c > @@ -55,12 +55,21 @@ > #define END_USE(vq) > #endif > > +#define _VRING_DESC_F_AVAIL(b) ((__u16)(b) << 7) > +#define _VRING_DESC_F_USED(b) ((__u16)(b) << 15) > + > struct vring_desc_state { > void *data; /* Data for callback. */ > struct vring_desc *indir_desc; /* Indirect descriptor, if any. */ > }; > > struct vring_desc_state_packed { > + void *data; /* Data for callback. */ > + struct vring_packed_desc *indir_desc; /* Indirect descriptor, if any. */ > + int num; /* Descriptor list length. */ > + dma_addr_t addr; /* Buffer DMA addr. */ > + u32 len; /* Buffer length. */ > + u16 flags; /* Descriptor flags. */ > int next; /* The next desc state. */ > }; >
Idea: how about using data to chain these descriptors? You can validate it's pointing within an array to distinguish e.g. on detach. -- MST _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
