diff options
| author |   Neale Ranns <neale@graphiant.com> | 2020-12-21 08:29:34 +0000 |
|---|---|---|
| committer |   Ole Tr�an <otroan@employees.org> | 2021-02-15 17:27:48 +0000 |
| commit | 8f5fef2c78b95de1a636ce27111722b71702212a (patch) | |
| tree | a0ebd0189969ccae1f0bdd7c1a9c18dd7a066f2e /src/vnet/adj/adj.c | |
| parent | 54be0cc044f445853fae7b8995c477605250af16 (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.c')
| -rw-r--r-- | src/vnet/adj/adj.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/vnet/adj/adj.c b/src/vnet/adj/adj.c index d3890223dc1..8808294f7a6 100644 --- a/src/vnet/adj/adj.c +++ b/src/vnet/adj/adj.c @@ -20,6 +20,7 @@ #include <vnet/adj/adj_mcast.h> #include <vnet/adj/adj_delegate.h> #include <vnet/fib/fib_node_list.h> +#include <vnet/fib/fib_walk.h> /* Adjacency packet/byte counters indexed by adjacency index. */ vlib_combined_counter_main_t adjacency_counters = { @@ -326,6 +327,16 @@ adj_dpo_get_urpf (const dpo_id_t *dpo) return (adj->rewrite_header.sw_if_index); } +u16 +adj_dpo_get_mtu (const dpo_id_t *dpo) +{ + ip_adjacency_t *adj; + + adj = adj_get(dpo->dpoi_index); + + return (adj->rewrite_header.max_l3_packet_bytes); +} + void adj_lock (adj_index_t adj_index) { @@ -465,6 +476,19 @@ adj_mtu_update_walk_cb (adj_index_t ai, vnet_rewrite_update_mtu (vnet_get_main(), adj->ia_link, &adj->rewrite_header); + adj_delegate_adj_modified(adj); + + /** + * Backwalk to all Path MTU trackers, casual like .. + */ + { + fib_node_back_walk_ctx_t bw_ctx = { + .fnbw_reason = FIB_NODE_BW_REASON_FLAG_ADJ_MTU, + }; + + fib_walk_async(FIB_NODE_TYPE_ADJ, ai, + FIB_WALK_PRIORITY_LOW, &bw_ctx); + } return (ADJ_WALK_RC_CONTINUE); } |