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

From: Jakub Kicinski <[email-masked]>
Date: Wed, 12 Jun 2024 16:20:11 -0700

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

> + */
> +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)