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

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Date: Thu, 9 Nov 2023 16:34:11 +0800
From: Heng Qi <hengqi@...ux.alibaba.com>
To: Jason Wang <jasowang@...hat.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



在 2023/11/9 下午12:45, Jason Wang 写道:
> 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?

When user tries to enable tx dim using following cmd:
'ethtool -C eth0 adaptive-tx on'

Thanks!

>
> 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
>>