netdev - Re: [PATCH net-next v5 03/15] virtio-net: add priv_flags IFF_NOT_USE_DMA

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Date:   Wed, 16 Jun 2021 17:27:59 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        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>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>,
        virtualization@...ts.linux-foundation.org, bpf@...r.kernel.org,
        "dust . li" <dust.li@...ux.alibaba.com>
Subject: Re: [PATCH net-next v5 03/15] virtio-net: add priv_flags
 IFF_NOT_USE_DMA_ADDR


在 2021/6/10 下午4:21, Xuan Zhuo 写道:
> virtio-net not use dma addr directly. So add this priv_flags
> IFF_NOT_USE_DMA_ADDR.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> ---
>   drivers/net/virtio_net.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 0416a7e00914..6c1233f0ab3e 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -3064,7 +3064,7 @@ static int virtnet_probe(struct virtio_device *vdev)
>   
>   	/* Set up network device as normal. */
>   	dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE |
> -			   IFF_TX_SKB_NO_LINEAR;
> +			   IFF_TX_SKB_NO_LINEAR | IFF_NOT_USE_DMA_ADDR;


I wonder instead of doing trick like this, how about teach the virtio 
core to accept DMA address via sg?

Thanks


>   	dev->netdev_ops = &virtnet_netdev;
>   	dev->features = NETIF_F_HIGHDMA;
>