netdev - Re: [PATCH net-next v2 5/5] virtio-net: return -EOPNOTSUPP for adaptive-tx

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Date: Thu, 9 Nov 2023 12:45:35 +0800
From: Jason Wang <jasowang@...hat.com>
To: Heng Qi <hengqi@...ux.alibaba.com>
Cc: netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org, 
	"Michael S. Tsirkin" <mst@...hat.com>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, 
	"David S. Miller" <davem@...emloft.net>, Jesper Dangaard Brouer <hawk@...nel.org>, 
	John Fastabend <john.fastabend@...il.com>, Alexei Starovoitov <ast@...nel.org>, 
	Simon Horman <horms@...nel.org>, Jakub Kicinski <kuba@...nel.org>, "Liu, Yujie" <yujie.liu@...el.com>
Subject: Re: [PATCH net-next v2 5/5] virtio-net: return -EOPNOTSUPP for adaptive-tx

On Thu, Nov 2, 2023 at 9:10 PM Heng Qi <hengqi@...ux.alibaba.com> wrote:
>
> We do not currently support tx dim, so respond to -EOPNOTSUPP.
>
> Signed-off-by: Heng Qi <hengqi@...ux.alibaba.com>
> ---
> v1->v2:
> - Use -EOPNOTSUPP instead of specific implementation.
>
>  drivers/net/virtio_net.c | 29 ++++++++++++++++++++++++++---
>  1 file changed, 26 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 5473aa1ee5cd..03edeadd0725 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -3364,9 +3364,15 @@ static int virtnet_get_link_ksettings(struct net_device *dev,
>  static int virtnet_send_tx_notf_coal_cmds(struct virtnet_info *vi,
>                                           struct ethtool_coalesce *ec)
>  {
> +       bool tx_ctrl_dim_on = !!ec->use_adaptive_tx_coalesce;
>         struct scatterlist sgs_tx;
>         int i;
>
> +       if (tx_ctrl_dim_on) {
> +               pr_debug("Failed to enable adaptive-tx, which is not supported\n");
> +               return -EOPNOTSUPP;
> +       }

When can we hit this?

Thanks

> +
>         vi->ctrl->coal_tx.tx_usecs = cpu_to_le32(ec->tx_coalesce_usecs);
>         vi->ctrl->coal_tx.tx_max_packets = cpu_to_le32(ec->tx_max_coalesced_frames);
>         sg_init_one(&sgs_tx, &vi->ctrl->coal_tx, sizeof(vi->ctrl->coal_tx));
> @@ -3497,6 +3503,25 @@ static int virtnet_send_rx_notf_coal_vq_cmds(struct virtnet_info *vi,
>         return 0;
>  }
>
> +static int virtnet_send_tx_notf_coal_vq_cmds(struct virtnet_info *vi,
> +                                            struct ethtool_coalesce *ec,
> +                                            u16 queue)
> +{
> +       bool tx_ctrl_dim_on = !!ec->use_adaptive_tx_coalesce;
> +       int err;
> +
> +       if (tx_ctrl_dim_on) {
> +               pr_debug("Enabling adaptive-tx for txq%d is not supported\n", queue);
> +               return -EOPNOTSUPP;
> +       }
> +
> +       err = virtnet_send_tx_ctrl_coal_vq_cmd(vi, queue,
> +                                              ec->tx_coalesce_usecs,
> +                                              ec->tx_max_coalesced_frames);
> +
> +       return err;
> +}
> +
>  static int virtnet_send_notf_coal_vq_cmds(struct virtnet_info *vi,
>                                           struct ethtool_coalesce *ec,
>                                           u16 queue)
> @@ -3507,9 +3532,7 @@ static int virtnet_send_notf_coal_vq_cmds(struct virtnet_info *vi,
>         if (err)
>                 return err;
>
> -       err = virtnet_send_tx_ctrl_coal_vq_cmd(vi, queue,
> -                                              ec->tx_coalesce_usecs,
> -                                              ec->tx_max_coalesced_frames);
> +       err = virtnet_send_tx_notf_coal_vq_cmds(vi, ec, queue);
>         if (err)
>                 return err;
>
> --
> 2.19.1.6.gb485710b
>