netdev - Re: [PATCH vhost 11/17] virtio_ring: export premapped to driver by struct virtqueue

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Message-ID: <1706757435.040749-1-xuanzhuo@linux.alibaba.com>
Date: Thu, 1 Feb 2024 11:17:15 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: Jason Wang <jasowang@...hat.com>
Cc: virtualization@...ts.linux.dev,
 Richard Weinberger <richard@....at>,
 Anton Ivanov <anton.ivanov@...bridgegreys.com>,
 Johannes Berg <johannes@...solutions.net>,
 "Michael S. Tsirkin" <mst@...hat.com>,
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 Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>,
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Subject: Re: [PATCH vhost 11/17] virtio_ring: export premapped to driver by struct virtqueue

On Wed, 31 Jan 2024 17:12:43 +0800, Jason Wang <jasowang@...hat.com> wrote:
> On Tue, Jan 30, 2024 at 7:43 PM Xuan Zhuo <xuanzhuo@...ux.alibaba.com> wrote:
> >
> > Export the premapped to drivers, then drivers can check
> > the vq premapped mode after the find_vqs().
> 
> This looks odd, it's the charge of the driver to set premapped, so it
> should know it?

If the use_dma_api is false, we can not enable the premapped mode.
Though we wrapped dma apis, but the AF_XDP use the default dma api directly.
As we discussed, we just work in premapped mode when the use_dma_api is true.

Thanks.

> 
> Thanks
>