netdev - Re: [PATCH vhost v6 09/10] virtio_net: set premapped mode by find

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Message-ID: <CACGkMEs=NZGkkA7ye0wY7YcPBPfbKkYq84KCRX1gS0e=bZDX-w@mail.gmail.com>
Date: Thu, 28 Mar 2024 16:05:02 +0800
From: Jason Wang <jasowang@...hat.com>
To: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc: virtualization@...ts.linux.dev, "Michael S. Tsirkin" <mst@...hat.com>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Subject: Re: [PATCH vhost v6 09/10] virtio_net: set premapped mode by find_vqs()

On Wed, Mar 27, 2024 at 7:14 PM Xuan Zhuo <xuanzhuo@...ux.alibaba.com> wrote:
>
> Now, the virtio core can set the premapped mode by find_vqs().
> If the premapped can be enabled, the dma array will not be
> allocated. So virtio-net use the api of find_vqs to enable the
> premapped.
>
> Judge the premapped mode by the vq->premapped instead of saving
> local variable.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> ---

I wonder what's the reason to keep a fallback when premapped is not enabled?

Thanks