netdev - Re: [PATCH bpf-next 03/10] ice: xsk: terminate NAPI when XSK Rx queue gets full

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Date:   Tue,  5 Apr 2022 13:34:03 +0200
From:   Alexander Lobakin <alexandr.lobakin@...el.com>
To:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        magnus.karlsson@...el.com, bjorn@...nel.org,
        netdev@...r.kernel.org, brouer@...hat.com, maximmi@...dia.com
Subject: Re: [PATCH bpf-next 03/10] ice: xsk: terminate NAPI when XSK Rx queue gets full

From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Date: Tue, 5 Apr 2022 13:06:24 +0200

> Correlate -ENOBUFS that was returned from xdp_do_redirect() with a XSK
> Rx queue being full. In such case, terminate the softirq processing and
> let the user space to consume descriptors from XSK Rx queue so that
> there is room that driver can use later on.
> 
> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_txrx.h |  1 +
>  drivers/net/ethernet/intel/ice/ice_xsk.c  | 25 +++++++++++++++--------
>  2 files changed, 17 insertions(+), 9 deletions(-)

--- 8< ---

> @@ -551,15 +552,15 @@ ice_run_xdp_zc(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp,
>  		if (result == ICE_XDP_CONSUMED)
>  			goto out_failure;
>  		break;
> +	case XDP_DROP:
> +		result = ICE_XDP_CONSUMED;
> +		break;
>  	default:
>  		bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, act);
>  		fallthrough;
>  	case XDP_ABORTED:
>  out_failure:
>  		trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
> -		fallthrough;
> -	case XDP_DROP:
> -		result = ICE_XDP_CONSUMED;
>  		break;

So the result for %XDP_ABORTED will be %ICE_XDP_PASS now? Or I'm
missing something :s

>  	}
>  
> @@ -628,10 +629,16 @@ int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget)

--- 8< ---

> -- 
> 2.33.1

Thanks,
Al