commit 1cd0e5dd533f4209dde453eaa43215e52cd42985
author Damjan Marion <damarion@cisco.com> Mon Jan 17 14:49:17 2022 +0100
committer Ole Tr�an <otroan@employees.org> Tue Jan 18 13:20:21 2022 +0000
tree 88ed4b47252cfe27c13ac0f85a6cfc86a7052d5b
parent 49378f206b8e780a898e632f7dd8db912b9b118e

vnet: distinguish between max_frame_size and MTU

Type: improvement
Change-Id: I3659de6599f402c92e3855e3bf0e5e3388f2bea0
Signed-off-by: Damjan Marion <damarion@cisco.com>

src/vnet/devices/af_packet/af_packet.c

diff --git a/src/vnet/devices/af_packet/af_packet.c b/src/vnet/devices/af_packet/af_packet.c
index cf4f91e..2085379 100644
--- a/src/vnet/devices/af_packet/af_packet.c
+++ b/src/vnet/devices/af_packet/af_packet.c
@@ -57,13 +57,15 @@
 typedef struct tpacket_req tpacket_req_t;
 
 static clib_error_t *
-af_packet_eth_set_mtu (vnet_main_t *vnm, vnet_hw_interface_t *hi, u32 mtu)
+af_packet_eth_set_max_frame_size (vnet_main_t *vnm, vnet_hw_interface_t *hi,
+				  u32 frame_size)
 {
   clib_error_t *error, *rv;
   af_packet_main_t *apm = &af_packet_main;
   af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, hi->dev_instance);
 
-  error = vnet_netlink_set_link_mtu (apif->host_if_index, mtu);
+  error = vnet_netlink_set_link_mtu (apif->host_if_index,
+				     frame_size + hi->frame_overhead);
 
   if (error)
     {
@@ -75,7 +77,7 @@
       return rv;
     }
   else
-    apif->host_mtu = mtu;
+    apif->host_mtu = frame_size + hi->frame_overhead;
   return 0;
 }
 
@@ -398,7 +400,7 @@
       eir.dev_class_index = af_packet_device_class.index;
       eir.dev_instance = if_index;
       eir.address = hw_addr;
-      eir.cb.set_mtu = af_packet_eth_set_mtu;
+      eir.cb.set_max_frame_size = af_packet_eth_set_max_frame_size;
       apif->hw_if_index = vnet_eth_register_interface (vnm, &eir);
     }
   else