diff options
| author |   Neale Ranns <neale.ranns@cisco.com> | 2018-02-09 06:05:16 -0800 |
|---|---|---|
| committer |   Damjan Marion <dmarion.lists@gmail.com> | 2018-02-12 11:23:33 +0000 |
| commit | ffd78d1ef8fe80d1b756a71d42d5eadda60ae996 (patch) | |
| tree | 99770e8773a7c3dd27c8b9b116edb6a39ace09ea /src/vnet/interface.c | |
| parent | 2d6f66e1748be190664cbd72c826db32616d759a (diff) | |
Improve MTU handling
- setting MTU on an interface updates the L3 max bytes too
- value cached in the adjacency is also updated
- MTU exceeded generates ICMP to sender
Change-Id: I343ec71d8e903b529594c4bd0543f04bc7f370b3
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>
Diffstat (limited to 'src/vnet/interface.c')
| -rw-r--r-- | src/vnet/interface.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/vnet/interface.c b/src/vnet/interface.c index a34bb7931ae..7516aec0e71 100644 --- a/src/vnet/interface.c +++ b/src/vnet/interface.c @@ -122,6 +122,22 @@ unserialize_vnet_sw_interface_set_flags (serialize_main_t * m, va_list * va) /* helper_flags no redistribution */ 0); } +void +vnet_hw_interface_set_mtu (vnet_main_t * vnm, u32 hw_if_index, u32 mtu) +{ + vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index); + + if (hi->max_packet_bytes != mtu) + { + u16 l3_pad = hi->max_packet_bytes - hi->max_l3_packet_bytes[VLIB_TX]; + hi->max_packet_bytes = mtu; + hi->max_l3_packet_bytes[VLIB_TX] = + hi->max_l3_packet_bytes[VLIB_RX] = mtu - l3_pad; + ethernet_set_flags (vnm, hw_if_index, ETHERNET_INTERFACE_FLAG_MTU); + adj_mtu_update (hw_if_index); + } +} + static void unserialize_vnet_hw_interface_set_flags (serialize_main_t * m, va_list * va) { |