netdev - Re: [PATCH net-next v4 04/10] xsk: support get page by addr

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Date:   Wed, 14 Apr 2021 08:59:50 +0200
From:   Magnus Karlsson <magnus.karlsson@...il.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.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-foundation.org,
        bpf <bpf@...r.kernel.org>,
        "dust . li" <dust.li@...ux.alibaba.com>
Subject: Re: [PATCH net-next v4 04/10] xsk: support get page by addr

On Tue, Apr 13, 2021 at 9:58 AM Xuan Zhuo <xuanzhuo@...ux.alibaba.com> wrote:
>
> xsk adds an interface and returns the page corresponding to
> data. virtio-net does not initialize dma, so it needs page to construct
> scatterlist to pass to vring.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> Reviewed-by: Dust Li <dust.li@...ux.alibaba.com>

Acked-by: Magnus Karlsson <magnus.karlsson@...el.com>

> ---
>  include/net/xdp_sock_drv.h | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/include/net/xdp_sock_drv.h b/include/net/xdp_sock_drv.h
> index 4e295541e396..1d08b5d8d15f 100644
> --- a/include/net/xdp_sock_drv.h
> +++ b/include/net/xdp_sock_drv.h
> @@ -72,6 +72,12 @@ static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
>         return xp_get_frame_dma(xskb);
>  }
>
> +static inline struct page *xsk_buff_xdp_get_page(struct xsk_buff_pool *pool, u64 addr)
> +{
> +       addr = pool->unaligned ? xp_unaligned_add_offset_to_addr(addr) : addr;
> +       return pool->umem->pgs[addr >> PAGE_SHIFT];
> +}
> +
>  static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
>  {
>         return xp_alloc(pool);
> @@ -207,6 +213,11 @@ static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
>         return 0;
>  }
>
> +static inline struct page *xsk_buff_xdp_get_page(struct xsk_buff_pool *pool, u64 addr)
> +{
> +       return NULL;
> +}
> +
>  static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
>  {
>         return NULL;
> --
> 2.31.0
>