netdev - Re: [PATCH net-next 5/6] i40e: Add info trace at loading XDP program

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Date:   Tue, 2 Feb 2021 18:33:52 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Tony Nguyen <anthony.l.nguyen@...el.com>
Cc:     davem@...emloft.net,
        Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
        netdev@...r.kernel.org, sassmann@...hat.com, bjorn.topel@...el.com,
        maciej.fijalkowski@...el.com, magnus.karlsson@...el.com,
        Aleksandr Loktionov <aleksandr.loktionov@...el.com>,
        George Kuruvinakunnel <george.kuruvinakunnel@...el.com>
Subject: Re: [PATCH net-next 5/6] i40e: Add info trace at loading XDP
 program

On Mon,  1 Feb 2021 18:24:19 -0800 Tony Nguyen wrote:
> From: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
> 
> New trace indicates that the XDP program was loaded.
> The trace has a note that in case of using XDP_REDIRECT,
> number of queues on both interfaces shall be the same.
> This is required for optimal performance of XDP_REDIRECT,
> if interface used for TX has lower number of queues than
> a RX interface, the packets may be dropped (depending on
> RSS queue assignment).

By RSS queue assignment you mean interrupt mapping?

> diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
> index 521ea9df38d5..f35bd9164106 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
> @@ -12489,11 +12489,14 @@ static int i40e_xdp_setup(struct i40e_vsi *vsi,
>  	/* Kick start the NAPI context if there is an AF_XDP socket open
>  	 * on that queue id. This so that receiving will start.
>  	 */
> -	if (need_reset && prog)
> +	if (need_reset && prog) {
> +		dev_info(&pf->pdev->dev,
> +			 "Loading XDP program, please note: XDP_REDIRECT action requires the same number of queues on both interfaces\n");

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