netdev - Re: [PATCH vhost v11 05/10] virtio_ring: introduce virtqueue_dma

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Date: Tue, 25 Jul 2023 10:13:48 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: Christoph Hellwig <hch@...radead.org>
Cc: Christoph Hellwig <hch@...radead.org>,
 virtualization@...ts.linux-foundation.org,
 Jason Wang <jasowang@...hat.com>,
 "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>,
 Jesper Dangaard Brouer <hawk@...nel.org>,
 John Fastabend <john.fastabend@...il.com>,
 netdev@...r.kernel.org,
 bpf@...r.kernel.org,
 "Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH vhost v11 05/10] virtio_ring: introduce virtqueue_dma_dev()

On Mon, 24 Jul 2023 09:43:42 -0700, Christoph Hellwig <hch@...radead.org> wrote:
> On Thu, Jul 20, 2023 at 01:21:07PM -0400, Michael S. Tsirkin wrote:
> > Well I think we can add wrappers like virtio_dma_sync and so on.
> > There are NOP for non-dma so passing the dma device is harmless.
>
> Yes, please.

I am not sure I got this fully.

Are you mean this:
https://lore.kernel.org/all/20230214072704.126660-8-xuanzhuo@linux.alibaba.com/
https://lore.kernel.org/all/20230214072704.126660-9-xuanzhuo@linux.alibaba.com/

Then the driver must do dma operation(map and sync) by these virtio_dma_* APIs.
No care the device is non-dma device or dma device.

Then the AF_XDP must use these virtio_dma_* APIs for virtio device.

Thanks