On Thu, Jul 4, 2019 at 4:46 PM Ilias Apalodimas
<ilias.apalodi...@linaro.org> wrote:
> diff --git a/drivers/net/ethernet/socionext/netsec.c
> b/drivers/net/ethernet/socionext/netsec.c
> index 5544a722543f..ada7626bf3a2 100644
> --- a/drivers/net/ethernet/socionext/netsec.c
>
> + dma_start = page_pool_get_dma_addr(page);
> /* We allocate the same buffer length for XDP and non-XDP cases.
> * page_pool API will map the whole page, skip what's needed for
> * network payloads and/or XDP
> */
> - *dma_handle = page_pool_get_dma_addr(page) + NETSEC_RXBUF_HEADROOM;
> + *dma_handle = dma_start + NETSEC_RXBUF_HEADROOM;
> /* Make sure the incoming payload fits in the page for XDP and non-XDP
> * cases and reserve enough space for headroom + skb_shared_info
> */
> *desc_len = PAGE_SIZE - NETSEC_RX_BUF_NON_DATA;
> + dma_dir = page_pool_get_dma_dir(dring->page_pool);
> + dma_sync_single_for_device(priv->dev, dma_start, PAGE_SIZE, dma_dir);
Should this maybe become part of the page_pool_*() interfaces?
Basically in order to map a page from the pool, any driver would have
to go through these exact steps, so you could make it a combined function
call
dma_addr_t page_pool_sync_for_device(dring->page_pool, page);
Or even fold the page_pool_dev_alloc_pages() into it as well and
make that return both the virtual and dma addresses.
Arnd
