From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: virtio-dev-return-4844-cohuck=redhat.com@lists.oasis-open.org Sender: List-Post: List-Help: List-Unsubscribe: List-Subscribe: Received: from lists.oasis-open.org (oasis-open.org [10.110.1.242]) by lists.oasis-open.org (Postfix) with ESMTP id 1A392985D24 for ; Wed, 12 Sep 2018 16:22:27 +0000 (UTC) Date: Wed, 12 Sep 2018 12:22:22 -0400 From: "Michael S. Tsirkin" Message-ID: <20180912121650-mutt-send-email-mst@kernel.org> References: <20180711022711.7090-1-tiwei.bie@intel.com> <20180711022711.7090-4-tiwei.bie@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180711022711.7090-4-tiwei.bie@intel.com> Subject: [virtio-dev] Re: [PATCH net-next v2 3/5] virtio_ring: add packed ring support To: Tiwei Bie Cc: jasowang@redhat.com, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, virtio-dev@lists.oasis-open.org, wexu@redhat.com, jfreimann@redhat.com List-ID: 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 > --- > 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 --------------------------------------------------------------------- To unsubscribe, e-mail: virtio-dev-unsubscribe@lists.oasis-open.org For additional commands, e-mail: virtio-dev-help@lists.oasis-open.org