netdev - Re: [PATCH net-next v2 8/9] nfp: add a stats handler for flower offloads

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Date:   Wed, 28 Jun 2017 18:28:17 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Simon Horman <simon.horman@...ronome.com>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        oss-drivers@...ronome.com,
        Pieter Jansen van Vuuren 
        <pieter.jansenvanvuuren@...ronome.com>
Subject: Re: [PATCH net-next v2 8/9] nfp: add a stats handler for flower
 offloads

On Wed, 28 Jun 2017 22:30:01 +0200, Simon Horman wrote:
> @@ -288,7 +292,21 @@ nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev,
>  static int
>  nfp_flower_get_stats(struct nfp_app *app, struct tc_cls_flower_offload *flow)
>  {
> -	return -EOPNOTSUPP;
> +	struct nfp_fl_payload *nfp_flow;
> +
> +	nfp_flow = nfp_flower_find_in_fl_table(app, flow->cookie);
> +	if (!nfp_flow)
> +		return -EINVAL;
> +
> +	spin_lock(&nfp_flow->lock);
> +	tcf_exts_stats_update(flow->exts, nfp_flow->stats.bytes,
> +			      nfp_flow->stats.pkts, nfp_flow->stats.used);
> +
> +	nfp_flow->stats.pkts = 0;
> +	nfp_flow->stats.bytes = 0;
> +	spin_unlock(&nfp_flow->lock);
> +
> +	return 0;
>  }

This needs to take spin_lock_bh() to lock out the RX path safely :(