netdev - Re: [PATCH net-next 3/7] net: hns3: add support for forwarding packet to queues of specified TC when flow director rule hit

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Date:   Wed, 09 Dec 2020 21:40:22 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     Huazhong Tan <tanhuazhong@...wei.com>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kuba@...nel.org, huangdaode@...wei.com,
        Jian Shen <shenjian15@...wei.com>
Subject: Re: [PATCH net-next 3/7] net: hns3: add support for forwarding
 packet to queues of specified TC when flow director rule hit

On Thu, 2020-12-10 at 11:42 +0800, Huazhong Tan wrote:
> From: Jian Shen <shenjian15@...wei.com>
> 
> For some new device, it supports forwarding packet to queues
> of specified TC when flow director rule hit. So extend the
> command handle to support it.
> 

...

>  static int hclge_config_action(struct hclge_dev *hdev, u8 stage,
>  			       struct hclge_fd_rule *rule)
>  {
> +	struct hclge_vport *vport = hdev->vport;
> +	struct hnae3_knic_private_info *kinfo = &vport->nic.kinfo;
>  	struct hclge_fd_ad_data ad_data;
>  
> +	memset(&ad_data, 0, sizeof(struct hclge_fd_ad_data));
>  	ad_data.ad_id = rule->location;
>  
>  	if (rule->action == HCLGE_FD_ACTION_DROP_PACKET) {
>  		ad_data.drop_packet = true;
> -		ad_data.forward_to_direct_queue = false;
> -		ad_data.queue_id = 0;
> +	} else if (rule->action == HCLGE_FD_ACTION_SELECT_TC) {
> +		ad_data.override_tc = true;
> +		ad_data.queue_id =
> +			kinfo->tc_info.tqp_offset[rule->tc];
> +		ad_data.tc_size =
> +			ilog2(kinfo->tc_info.tqp_count[rule->tc]);

In the previous patch you copied this info from mqprio, which is an
egress qdisc feature, this patch is clearly about rx flow director, I
think the patch is missing some context otherwise it doesn't make any
sense.

>  	} else {
> -		ad_data.drop_packet = false;
>  		ad_data.forward_to_direct_queue = true;
>  		ad_data.queue_id = rule->queue_id;
>  	}
> @@ -5937,7 +5950,7 @@ static int hclge_add_fd_entry(struct
> hnae3_handle *handle,
>  			return -EINVAL;
>  		}
>  
> -		action = HCLGE_FD_ACTION_ACCEPT_PACKET;
> +		action = HCLGE_FD_ACTION_SELECT_QUEUE;
>  		q_index = ring;
>  	}
>  
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
> b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
> index b3c1301..a481064 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
> @@ -572,8 +572,9 @@ enum HCLGE_FD_PACKET_TYPE {
>  };
>  
>  enum HCLGE_FD_ACTION {
> -	HCLGE_FD_ACTION_ACCEPT_PACKET,
> +	HCLGE_FD_ACTION_SELECT_QUEUE,
>  	HCLGE_FD_ACTION_DROP_PACKET,
> +	HCLGE_FD_ACTION_SELECT_TC,

what is SELECT_TC ? you never actually write this value anywhere  in
this patch.