netdev - Re: [PATCH net-next v4 01/15] virtio_ring: introduce dma map api for page

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Date: Thu, 13 Jun 2024 10:38:59 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org,
 "Michael S. Tsirkin" <mst@...hat.com>,
 Jason Wang <jasowang@...hat.com>,
 Eugenio Pérez <eperezma@...hat.com>,
 "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>,
 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>,
 virtualization@...ts.linux.dev,
 bpf@...r.kernel.org
Subject: Re: [PATCH net-next v4 01/15] virtio_ring: introduce dma map api for page

On Wed, 12 Jun 2024 16:20:11 -0700, Jakub Kicinski <kuba@...nel.org> wrote:
> On Tue, 11 Jun 2024 19:41:33 +0800 Xuan Zhuo wrote:
> > +/**
> > + * virtqueue_dma_map_page_attrs - map DMA for _vq
> > + * @_vq: the struct virtqueue we're talking about.
> > + * @page: the page to do dma
> > + * @offset: the offset inside the page
> > + * @size: the size of the page to do dma
> > + * @dir: DMA direction
> > + * @attrs: DMA Attrs
> > + *
> > + * The caller calls this to do dma mapping in advance. The DMA address can be
> > + * passed to this _vq when it is in pre-mapped mode.
> > + *
> > + * return DMA address. Caller should check that by virtqueue_dma_mapping_error().
>
> You gotta format the return value doc in a kdoc-sanctioned way.
> please run ./scripts/kernel-doc -none -Wall to find such issues

Will fix.

Thanks.

>
> > + */
> > +dma_addr_t virtqueue_dma_map_page_attrs(struct virtqueue *_vq, struct page *page,
> > +					size_t offset, size_t size,
> > +					enum dma_data_direction dir,
> > +					unsigned long attrs)