netdev - Re: [PATCH vhost v2 19/19] virtio_net: sq support premapped mode

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Date: Mon, 26 Feb 2024 06:36:53 -0500
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc: virtualization@...ts.linux.dev, Richard Weinberger <richard@....at>,
	Anton Ivanov <anton.ivanov@...bridgegreys.com>,
	Johannes Berg <johannes@...solutions.net>,
	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>,
	Hans de Goede <hdegoede@...hat.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Vadim Pasternak <vadimp@...dia.com>,
	Bjorn Andersson <andersson@...nel.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Cornelia Huck <cohuck@...hat.com>,
	Halil Pasic <pasic@...ux.ibm.com>,
	Eric Farman <farman@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	linux-um@...ts.infradead.org, netdev@...r.kernel.org,
	platform-driver-x86@...r.kernel.org,
	linux-remoteproc@...r.kernel.org, linux-s390@...r.kernel.org,
	kvm@...r.kernel.org, bpf@...r.kernel.org,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH vhost v2 19/19] virtio_net: sq support premapped mode

On Mon, Feb 26, 2024 at 07:33:29PM +0800, Xuan Zhuo wrote:
> > what is dma_map_direct? can't find it in the tree.
> 
> YES.
> 
> 
> diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
> index 58db8fd70471..5a8f7a927aa1 100644
> --- a/kernel/dma/mapping.c
> +++ b/kernel/dma/mapping.c
> @@ -144,6 +144,18 @@ static inline bool dma_map_direct(struct device *dev,
>         return dma_go_direct(dev, *dev->dma_mask, ops);
>  }
> 
> +bool dma_is_direct(struct device *dev)
> +{
> +       if (!dma_map_direct(dev, ops))
> +               return false;
> +
> +       if (is_swiotlb_force_bounce(dev))
> +               return false;
> +
> +       return true;
> +}
> +EXPORT_SYMBOL(dma_unmap_page_attrs);
> +
> 
> Thanks.


where is it? linux-next?

-- 
MST