netdev - Re: [net-next 5/6] i40e, xsk: increase budget for AF

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Date:   Tue, 28 Jul 2020 13:15:12 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Tony Nguyen <anthony.l.nguyen@...el.com>
Cc:     davem@...emloft.net,
        Björn Töpel <bjorn.topel@...el.com>,
        netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
        jeffrey.t.kirsher@...el.com,
        Andrew Bowers <andrewx.bowers@...el.com>
Subject: Re: [net-next 5/6] i40e, xsk: increase budget for AF_XDP path

On Tue, 28 Jul 2020 12:08:41 -0700 Tony Nguyen wrote:
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
> index 1f2dd591dbf1..99f4afdc403d 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
> @@ -265,6 +265,8 @@ static void i40e_inc_ntc(struct i40e_ring *rx_ring)
>  	rx_ring->next_to_clean = ntc;
>  }
>  
> +#define I40E_XSK_CLEAN_RX_BUDGET 256U
> +
>  /**
>   * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring
>   * @rx_ring: Rx ring
> @@ -280,7 +282,7 @@ int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
>  	bool failure = false;
>  	struct sk_buff *skb;
>  
> -	while (likely(total_rx_packets < (unsigned int)budget)) {
> +	while (likely(total_rx_packets < I40E_XSK_CLEAN_RX_BUDGET)) {
>  		union i40e_rx_desc *rx_desc;
>  		struct xdp_buff **bi;
>  		unsigned int size;

Should this perhaps be a common things that drivers do?

Should we define a "XSK_NAPI_WEIGHT_MULT 4" instead of hard coding the
value in a driver?