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authorNeale Ranns <neale@graphiant.com>2020-12-21 08:29:34 +0000
committerOle Tr�an <otroan@employees.org>2021-02-15 17:27:48 +0000
commit8f5fef2c78b95de1a636ce27111722b71702212a (patch)
treea0ebd0189969ccae1f0bdd7c1a9c18dd7a066f2e /src/vnet/adj/adj_nbr.c
parent54be0cc044f445853fae7b8995c477605250af16 (diff)
ip: Path MTU
Type: feature Support setting the MTU for a peer on an interface. The minimum value of the path and interface MTU is used at forwarding time. the path MTU is specified for a given peer, by address and table-ID. In the forwarding plane the MTU is enfored either: 1 - if the peer is attached, then the MTU is set on the peer's adjacency 2 - if the peer is not attached, it is remote, then a DPO is added to the peer's FIB entry to perform the necessary fragmentation. Signed-off-by: Neale Ranns <neale@graphiant.com> Change-Id: I8b9ea6a07868b50e97e2561f18d9335407dea7ae
Diffstat (limited to 'src/vnet/adj/adj_nbr.c')
-rw-r--r--src/vnet/adj/adj_nbr.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/src/vnet/adj/adj_nbr.c b/src/vnet/adj/adj_nbr.c
index 921588a7ef7..811d0b8faa2 100644
--- a/src/vnet/adj/adj_nbr.c
+++ b/src/vnet/adj/adj_nbr.c
@@ -222,6 +222,27 @@ adj_nbr_alloc (fib_protocol_t nh_proto,
return (adj);
}
+void
+adj_nbr_set_mtu (adj_index_t adj_index, u16 mtu)
+{
+ ip_adjacency_t *adj;
+
+ ASSERT(ADJ_INDEX_INVALID != adj_index);
+
+ adj = adj_get(adj_index);
+
+ if (0 == mtu)
+ vnet_rewrite_update_mtu(vnet_get_main(), adj->ia_link,
+ &adj->rewrite_header);
+ else
+ {
+ vnet_rewrite_update_mtu(vnet_get_main(), adj->ia_link,
+ &adj->rewrite_header);
+ adj->rewrite_header.max_l3_packet_bytes =
+ clib_min (adj->rewrite_header.max_l3_packet_bytes, mtu);
+ }
+}
+
/*
* adj_nbr_add_or_lock
*
@@ -268,13 +289,13 @@ adj_nbr_add_or_lock (fib_protocol_t nh_proto,
* So ask the interface to do it.
*/
vnet_update_adjacency_for_sw_interface(vnm, sw_if_index, adj_index);
+ adj_delegate_adj_created(adj_get(adj_index));
}
else
{
adj_lock(adj_index);
}
- adj_delegate_adj_created(adj_get(adj_index));
return (adj_index);
}
@@ -1055,12 +1076,14 @@ const static dpo_vft_t adj_nbr_dpo_vft = {
.dv_format = format_adj_nbr,
.dv_mem_show = adj_mem_show,
.dv_get_urpf = adj_dpo_get_urpf,
+ .dv_get_mtu = adj_dpo_get_mtu,
};
const static dpo_vft_t adj_nbr_incompl_dpo_vft = {
.dv_lock = adj_dpo_lock,
.dv_unlock = adj_dpo_unlock,
.dv_format = format_adj_nbr_incomplete,
.dv_get_urpf = adj_dpo_get_urpf,
+ .dv_get_mtu = adj_dpo_get_mtu,
};
/**