fix gcc 5.4 warning: argument to 'sizeof' in 'memcpy' call is the same expression as the destination

warning translates as an invalid write :
sizeof(u8* b_dmac) == 8 != sizeof(eth_hdr->dst_address) == 6

~/vpp/build-data/../src/vnet/l2/l2_vtr.c: In function 'l2pbb_get':
~/vpp/build-data/../src/vnet/l2/l2_vtr.c:734:63: error: argument to 'sizeof' in 'memcpy' call is the same expression as the destination;
        did you mean to provide an explicit length?  [-Werror=sizeof-pointer-memaccess]
~/vpp/build-data/../src/vnet/l2/l2_vtr.c:736:63: error: argument to 'sizeof' in 'memcpy' call is the same expression as the destination;
        did you mean to provide an explicit length?  [-Werror=sizeof-pointer-memaccess]

update l2pbb_get to take an ethernet header instead of two u8* pointers
for source and dest mac addresses.

Change-Id: Ifcf1319a9e22614d57682f940e10f0420dc6fb8c
Signed-off-by: Gabriel Ganne <gabriel.ganne@enea.com>

3 files changed, 15 insertions, 17 deletions

diff --git a/src/vnet/interface_api.c b/src/vnet/interface_api.c
index bfd2af31a58..2b6ff0c590a 100644
--- a/src/vnet/interface_api.c
+++ b/src/vnet/interface_api.c
@@ -205,21 +205,21 @@ send_sw_interface_details (vpe_api_main_t * am,
     }
 
   /* pbb tag rewrite data */
+  ethernet_header_t eth_hdr;
   u32 vtr_op = L2_VTR_DISABLED;
   u16 outer_tag = 0;
-  u8 b_dmac[6];
-  u8 b_smac[6];
   u16 b_vlanid = 0;
   u32 i_sid = 0;
-  memset (b_dmac, 0, sizeof (b_dmac));
-  memset (b_smac, 0, sizeof (b_smac));
+  memset (&eth_hdr, 0, sizeof (eth_hdr));
 
   if (!l2pbb_get (am->vlib_main, am->vnet_main, swif->sw_if_index,
-		  &vtr_op, &outer_tag, b_dmac, b_smac, &b_vlanid, &i_sid))
+		  &vtr_op, &outer_tag, &eth_hdr, &b_vlanid, &i_sid))
     {
       mp->sub_dot1ah = 1;
-      clib_memcpy (mp->b_dmac, b_dmac, sizeof (b_dmac));
-      clib_memcpy (mp->b_smac, b_smac, sizeof (b_smac));
+      clib_memcpy (mp->b_dmac, eth_hdr.dst_address,
+		   sizeof (eth_hdr.dst_address));
+      clib_memcpy (mp->b_smac, eth_hdr.src_address,
+		   sizeof (eth_hdr.src_address));
       mp->b_vlanid = b_vlanid;
       mp->i_sid = i_sid;
     }
diff --git a/src/vnet/l2/l2_vtr.c b/src/vnet/l2/l2_vtr.c
index e03a4880a5e..3c5365f9b51 100644
--- a/src/vnet/l2/l2_vtr.c
+++ b/src/vnet/l2/l2_vtr.c
@@ -687,7 +687,7 @@ VLIB_CLI_COMMAND (int_l2_vtr_cli, static) = {
  */
 u32
 l2pbb_get (vlib_main_t * vlib_main, vnet_main_t * vnet_main, u32 sw_if_index,
-	   u32 * vtr_op, u16 * outer_tag, u8 * b_dmac, u8 * b_smac,
+	   u32 * vtr_op, u16 * outer_tag, ethernet_header_t * eth_hdr,
 	   u16 * b_vlanid, u32 * i_sid)
 {
   u32 error = 1;
@@ -702,8 +702,6 @@ l2pbb_get (vlib_main_t * vlib_main, vnet_main_t * vnet_main, u32 sw_if_index,
 
   *vtr_op = L2_VTR_DISABLED;
   *outer_tag = 0;
-  *b_dmac = 0;
-  *b_smac = 0;
   *b_vlanid = 0;
   *i_sid = 0;
 
@@ -731,16 +729,16 @@ l2pbb_get (vlib_main_t * vlib_main, vnet_main_t * vnet_main, u32 sw_if_index,
       else if (in_config->push_bytes)
 	*vtr_op = L2_VTR_PUSH_2;
 
-      clib_memcpy (b_dmac, in_config->macs_tags.b_dst_address,
-		   sizeof (b_dmac));
-      clib_memcpy (b_smac, in_config->macs_tags.b_src_address,
-		   sizeof (b_smac));
+      clib_memcpy (&eth_hdr->dst_address, in_config->macs_tags.b_dst_address,
+		   sizeof (eth_hdr->dst_address));
+      clib_memcpy (&eth_hdr->src_address, in_config->macs_tags.b_src_address,
+		   sizeof (eth_hdr->src_address));
 
       *b_vlanid =
 	clib_host_to_net_u16 (in_config->macs_tags.priority_dei_id) & 0xFFF;
       *i_sid =
-	clib_host_to_net_u32 (in_config->
-			      macs_tags.priority_dei_uca_res_sid) & 0xFFFFF;
+	clib_host_to_net_u32 (in_config->macs_tags.
+			      priority_dei_uca_res_sid) & 0xFFFFF;
       error = 0;
     }
 done:
diff --git a/src/vnet/l2/l2_vtr.h b/src/vnet/l2/l2_vtr.h
index 99aedc970db..0aea618e080 100644
--- a/src/vnet/l2/l2_vtr.h
+++ b/src/vnet/l2/l2_vtr.h
@@ -267,7 +267,7 @@ u32 l2pbb_get (vlib_main_t * vlib_main,
 	       u32 sw_if_index,
 	       u32 * vtr_op,
 	       u16 * outer_tag,
-	       u8 * b_dmac, u8 * b_smac, u16 * b_vlanid, u32 * i_sid);
+	       ethernet_header_t * eth_hdr, u16 * b_vlanid, u32 * i_sid);
 
 #endif /* included_vnet_l2_vtr_h */