netdev - Re: [PATCH net-next v2 2/2] virtio-net: support dim profile fine-tuning

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Date: Thu, 28 Mar 2024 15:51:14 +0800
From: Heng Qi <hengqi@...ux.alibaba.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 Vladimir Oltean <vladimir.oltean@....com>,
 "David S. Miller" <davem@...emloft.net>, Jason Wang <jasowang@...hat.com>,
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Subject: Re: [PATCH net-next v2 2/2] virtio-net: support dim profile
 fine-tuning



在 2024/3/28 下午3:27, Michael S. Tsirkin 写道:
> On Wed, Mar 27, 2024 at 05:19:06PM +0800, Heng Qi wrote:
>> Virtio-net has different types of back-end device
>> implementations. In order to effectively optimize
>> the dim library's gains for different device
>> implementations, let's use the new interface params
>> to fine-tune the profile list.
>>
>> Signed-off-by: Heng Qi <hengqi@...ux.alibaba.com>
>> ---
>>   drivers/net/virtio_net.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++--
>>   1 file changed, 52 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
>> index e709d44..9b6c727 100644
>> --- a/drivers/net/virtio_net.c
>> +++ b/drivers/net/virtio_net.c
>> @@ -57,6 +57,16 @@
>>   
>>   #define VIRTNET_DRIVER_VERSION "1.0.0"
>>   
>> +/* This is copied from NET_DIM_RX_EQE_PROFILES in DIM library */
> So maybe move it to a header and reuse?

Will do. And plan to put configurable parameters into 'vi'.

Thanks.

>
>
>> +#define VIRTNET_DIM_RX_PKTS 256
>> +static struct dim_cq_moder rx_eqe_conf[] = {
>> +	{.usec = 1,   .pkts = VIRTNET_DIM_RX_PKTS,},
>> +	{.usec = 8,   .pkts = VIRTNET_DIM_RX_PKTS,},
>> +	{.usec = 64,  .pkts = VIRTNET_DIM_RX_PKTS,},
>> +	{.usec = 128, .pkts = VIRTNET_DIM_RX_PKTS,},
>> +	{.usec = 256, .pkts = VIRTNET_DIM_RX_PKTS,}
>> +};
>> +
>>   static const unsigned long guest_offloads[] = {
>>   	VIRTIO_NET_F_GUEST_TSO4,
>>   	VIRTIO_NET_F_GUEST_TSO6,
>> @@ -3584,7 +3594,10 @@ static void virtnet_rx_dim_work(struct work_struct *work)
>>   		if (!rq->dim_enabled)
>>   			continue;
>>   
>> -		update_moder = net_dim_get_rx_moderation(dim->mode, dim->profile_ix);
>> +		if (dim->profile_ix >= ARRAY_SIZE(rx_eqe_conf))
>> +			dim->profile_ix = ARRAY_SIZE(rx_eqe_conf) - 1;
>> +
>> +		update_moder = rx_eqe_conf[dim->profile_ix];
>>   		if (update_moder.usec != rq->intr_coal.max_usecs ||
>>   		    update_moder.pkts != rq->intr_coal.max_packets) {
>>   			err = virtnet_send_rx_ctrl_coal_vq_cmd(vi, qnum,
>> @@ -3627,6 +3640,34 @@ static int virtnet_should_update_vq_weight(int dev_flags, int weight,
>>   	return 0;
>>   }
>>   
>> +static int virtnet_update_profile(struct virtnet_info *vi,
>> +				  struct kernel_ethtool_coalesce *kc)
>> +{
>> +	int i;
>> +
>> +	if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL)) {
>> +		for (i = 0; i < NET_DIM_PARAMS_NUM_PROFILES; i++)
>> +			if (kc->rx_eqe_profs[i].comps)
>> +				return -EINVAL;
>> +	} else {
>> +		for (i = 0; i < NET_DIM_PARAMS_NUM_PROFILES; i++) {
>> +			if (kc->rx_eqe_profs[i].usec != rx_eqe_conf[i].usec ||
>> +			    kc->rx_eqe_profs[i].pkts != rx_eqe_conf[i].pkts ||
>> +			    kc->rx_eqe_profs[i].comps)
>> +				return -EINVAL;
>> +		}
>> +
>> +		return 0;
>> +	}
>> +
>> +	for (i = 0; i < NET_DIM_PARAMS_NUM_PROFILES; i++) {
>> +		rx_eqe_conf[i].usec = kc->rx_eqe_profs[i].usec;
>> +		rx_eqe_conf[i].pkts = kc->rx_eqe_profs[i].pkts;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>>   static int virtnet_set_coalesce(struct net_device *dev,
>>   				struct ethtool_coalesce *ec,
>>   				struct kernel_ethtool_coalesce *kernel_coal,
>> @@ -3653,6 +3694,10 @@ static int virtnet_set_coalesce(struct net_device *dev,
>>   		}
>>   	}
>>   
>> +	ret = virtnet_update_profile(vi, kernel_coal);
>> +	if (ret)
>> +		return ret;
>> +
>>   	if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL))
>>   		ret = virtnet_send_notf_coal_cmds(vi, ec);
>>   	else
>> @@ -3689,6 +3734,10 @@ static int virtnet_get_coalesce(struct net_device *dev,
>>   			ec->tx_max_coalesced_frames = 1;
>>   	}
>>   
>> +	if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
>> +		memcpy(kernel_coal->rx_eqe_profs, rx_eqe_conf,
>> +		       sizeof(rx_eqe_conf));
>> +
>>   	return 0;
>>   }
>>   
>> @@ -3868,7 +3917,8 @@ static int virtnet_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info)
>>   
>>   static const struct ethtool_ops virtnet_ethtool_ops = {
>>   	.supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES |
>> -		ETHTOOL_COALESCE_USECS | ETHTOOL_COALESCE_USE_ADAPTIVE_RX,
>> +		ETHTOOL_COALESCE_USECS | ETHTOOL_COALESCE_USE_ADAPTIVE_RX |
>> +		ETHTOOL_COALESCE_RX_EQE_PROFILE,
>>   	.get_drvinfo = virtnet_get_drvinfo,
>>   	.get_link = ethtool_op_get_link,
>>   	.get_ringparam = virtnet_get_ringparam,
>> -- 
>> 1.8.3.1