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Date: Thu, 4 Jun 2020 17:18:00 +0800 From: Jason Wang <jasowang@...hat.com> To: "Michael S. Tsirkin" <mst@...hat.com> Cc: linux-kernel@...r.kernel.org, Eugenio Pérez <eperezma@...hat.com>, kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org Subject: Re: [PATCH RFC 07/13] vhost: format-independent API for used buffers On 2020/6/4 下午5:03, Michael S. Tsirkin wrote: >>> static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq) >>> { >>> __u16 old, new; >>> diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h >>> index a67bda9792ec..6c10e99ff334 100644 >>> --- a/drivers/vhost/vhost.h >>> +++ b/drivers/vhost/vhost.h >>> @@ -67,6 +67,13 @@ struct vhost_desc { >>> u16 id; >>> }; >>> +struct vhost_buf { >>> + u32 out_len; >>> + u32 in_len; >>> + u16 descs; >>> + u16 id; >>> +}; >> So it looks to me the struct vhost_buf can work for both split ring and >> packed ring. >> >> If this is true, we'd better make struct vhost_desc work for both. >> >> Thanks > Both vhost_desc and vhost_buf can work for split and packed. > > Do you mean we should add packed ring support based on this? > For sure, this is one of the motivators for the patchset. > Somehow. But the reason I ask is that I see "split" suffix is used in patch 1 as: peek_split_desc() pop_split_desc() push_split_desc() But that suffix is not used for the new used ring API invented in this patch. Thanks
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