[Intel-wired-lan] [PATCH] i40evf: pass struct virtchnl_filter by reference rather than by value

[Ramamurthy, Harshitha]

On Thu, 2018-02-15 at 19:26 +0000, Colin King wrote:
> From: Colin Ian King <colin.king at canonical.com>
> 
> Passing struct virtchnl_filter f by value requires a 272 byte copy
> on x86_64, so instead pass it by reference is much more efficient.
> Also
> adjust some lines that are over 80 chars.
> 
> Detected by CoverityScan, CID#1465285 ("Big parameter passed by
> value")
> 
> Signed-off-by: Colin Ian King <colin.king at canonical.com>
> ---

Acked-by: Harshitha Ramamurthy <harshitha.ramamurthy at intel.com>
>  .../net/ethernet/intel/i40evf/i40evf_virtchnl.c    | 32
> ++++++++++++----------
>  1 file changed, 18 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c
> b/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c
> index 6134b61e0938..3c76c817ca1a 100644
> --- a/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c
> +++ b/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c
> @@ -1048,24 +1048,28 @@ void i40evf_disable_channels(struct
> i40evf_adapter *adapter)
>   * Print the cloud filter
>   **/
>  static void i40evf_print_cloud_filter(struct i40evf_adapter
> *adapter,
> -				      struct virtchnl_filter f)
> +				      struct virtchnl_filter *f)
>  {
> -	switch (f.flow_type) {
> +	switch (f->flow_type) {
>  	case VIRTCHNL_TCP_V4_FLOW:
>  		dev_info(&adapter->pdev->dev, "dst_mac: %pM src_mac:
> %pM vlan_id: %hu dst_ip: %pI4 src_ip %pI4 dst_port %hu src_port
> %hu\n",
> -			 &f.data.tcp_spec.dst_mac,
> &f.data.tcp_spec.src_mac,
> -			 ntohs(f.data.tcp_spec.vlan_id),
> -			 &f.data.tcp_spec.dst_ip[0],
> &f.data.tcp_spec.src_ip[0],
> -			 ntohs(f.data.tcp_spec.dst_port),
> -			 ntohs(f.data.tcp_spec.src_port));
> +			 &f->data.tcp_spec.dst_mac,
> +			 &f->data.tcp_spec.src_mac,
> +			 ntohs(f->data.tcp_spec.vlan_id),
> +			 &f->data.tcp_spec.dst_ip[0],
> +			 &f->data.tcp_spec.src_ip[0],
> +			 ntohs(f->data.tcp_spec.dst_port),
> +			 ntohs(f->data.tcp_spec.src_port));
>  		break;
>  	case VIRTCHNL_TCP_V6_FLOW:
>  		dev_info(&adapter->pdev->dev, "dst_mac: %pM src_mac:
> %pM vlan_id: %hu dst_ip: %pI6 src_ip %pI6 dst_port %hu src_port
> %hu\n",
> -			 &f.data.tcp_spec.dst_mac,
> &f.data.tcp_spec.src_mac,
> -			 ntohs(f.data.tcp_spec.vlan_id),
> -			 &f.data.tcp_spec.dst_ip,
> &f.data.tcp_spec.src_ip,
> -			 ntohs(f.data.tcp_spec.dst_port),
> -			 ntohs(f.data.tcp_spec.src_port));
> +			 &f->data.tcp_spec.dst_mac,
> +			 &f->data.tcp_spec.src_mac,
> +			 ntohs(f->data.tcp_spec.vlan_id),
> +			 &f->data.tcp_spec.dst_ip,
> +			 &f->data.tcp_spec.src_ip,
> +			 ntohs(f->data.tcp_spec.dst_port),
> +			 ntohs(f->data.tcp_spec.src_port));
>  		break;
>  	}
>  }
> @@ -1303,7 +1307,7 @@ void i40evf_virtchnl_completion(struct
> i40evf_adapter *adapter,
>  						 i40evf_stat_str(&ad
> apter->hw,
>  								 v_r
> etval));
>  					i40evf_print_cloud_filter(ad
> apter,
> -								  cf
> ->f);
> +								  &c
> f->f);
>  					list_del(&cf->list);
>  					kfree(cf);
>  					adapter->num_cloud_filters
> --;
> @@ -1322,7 +1326,7 @@ void i40evf_virtchnl_completion(struct
> i40evf_adapter *adapter,
>  						 i40evf_stat_str(&ad
> apter->hw,
>  								 v_r
> etval));
>  					i40evf_print_cloud_filter(ad
> apter,
> -								  cf
> ->f);
> +								  &c
> f->f);
>  				}
>  			}
>  			}