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 19:55:18 -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:
> From: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@...ronome.com>
> 
> Previously there was no way of updating flow rule stats after they
> have been offloaded to hardware. This is solved by keeping track of
> stats received from hardware and providing this to the TC handler
> on request.
> 
> Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@...ronome.com>
> Signed-off-by: Simon Horman <simon.horman@...ronome.com>

> @@ -334,7 +441,10 @@ int nfp_modify_flow_metadata(struct nfp_app *app,
>  	/* Update flow payload with mask ids. */
>  	nfp_flow->unmasked_data[NFP_FL_MASK_ID_LOCATION] = new_mask_id;
>  
> -	return 0;
> +	/* Release the stats ctx id. */
> +	temp_ctx_id = be32_to_cpu(nfp_flow->meta.host_ctx_id);
> +
> +	return nfp_release_stats_entry(app, temp_ctx_id);
>  }
>  
>  int nfp_flower_metadata_init(struct nfp_app *app)
> @@ -362,6 +472,15 @@ int nfp_flower_metadata_init(struct nfp_app *app)
>  		return -ENOMEM;
>  	}
>  
> +	/* Init ring buffer and unallocated stats_ids. */
> +	priv->stats_ids.free_list.buf =
> +		vmalloc(NFP_FL_STATS_ENTRY_RS * NFP_FL_STATS_ELEM_RS);
> +	if (!priv->stats_ids.free_list.buf) {
> +		vfree(priv->mask_ids.mask_id_free_list.buf);
> +		return -ENOMEM;

This is hiding a leak, I think.  There were 2 things allocate above.
Please add a proper unwind path with goto's - it makes catching bugs
like this much easier.

> +	}
> +	priv->stats_ids.init_unalloc = NFP_FL_REPEATED_HASH_MAX;
> +
>  	return 0;
>  }
>