aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/fib
diff options
context:
space:
mode:
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/fib
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/fib')
-rw-r--r--src/vnet/fib/fib_entry.c20
-rw-r--r--src/vnet/fib/fib_node.h6
-rw-r--r--src/vnet/fib/fib_path.c1
3 files changed, 25 insertions, 2 deletions
diff --git a/src/vnet/fib/fib_entry.c b/src/vnet/fib/fib_entry.c
index 6edf31b47f3..119a7ac5e77 100644
--- a/src/vnet/fib/fib_entry.c
+++ b/src/vnet/fib/fib_entry.c
@@ -1362,7 +1362,7 @@ fib_entry_cover_updated (fib_node_index_t fib_entry_index)
if (0 == index)
{
/*
- * only the best source gets to set the back walk flags
+ * only the best source gets to set the install result
*/
res = fib_entry_src_action_cover_update(fib_entry, esrc);
bflags = fib_entry_src_get_flags(esrc);
@@ -1370,7 +1370,23 @@ fib_entry_cover_updated (fib_node_index_t fib_entry_index)
}
else
{
- fib_entry_src_action_cover_update(fib_entry, esrc);
+ /*
+ * contirubting sources can set backwalk flags
+ */
+ if (esrc->fes_flags & FIB_ENTRY_SRC_FLAG_CONTRIBUTING)
+ {
+ fib_entry_src_cover_res_t tmp = {
+ .install = !0,
+ .bw_reason = FIB_NODE_BW_REASON_FLAG_NONE,
+ };
+
+ tmp = fib_entry_src_action_cover_update(fib_entry, esrc);
+ res.bw_reason |= tmp.bw_reason;
+ }
+ else
+ {
+ fib_entry_src_action_cover_update(fib_entry, esrc);
+ }
}
index++;
}));
diff --git a/src/vnet/fib/fib_node.h b/src/vnet/fib/fib_node.h
index 5cf9182560f..27e67b11c87 100644
--- a/src/vnet/fib/fib_node.h
+++ b/src/vnet/fib/fib_node.h
@@ -119,6 +119,10 @@ typedef enum fib_node_back_walk_reason_t_ {
*/
FIB_NODE_BW_REASON_ADJ_UPDATE,
/**
+ * Walk update the adjacency MTU
+ */
+ FIB_NODE_BW_REASON_ADJ_MTU,
+ /**
* Walk to update children to inform them the adjacency is now down.
*/
FIB_NODE_BW_REASON_ADJ_DOWN,
@@ -135,6 +139,7 @@ typedef enum fib_node_back_walk_reason_t_ {
[FIB_NODE_BW_REASON_INTERFACE_DOWN] = "if-down", \
[FIB_NODE_BW_REASON_INTERFACE_DELETE] = "if-delete", \
[FIB_NODE_BW_REASON_ADJ_UPDATE] = "adj-update", \
+ [FIB_NODE_BW_REASON_ADJ_MTU] = "adj-mtu", \
[FIB_NODE_BW_REASON_ADJ_DOWN] = "adj-down", \
}
@@ -154,6 +159,7 @@ typedef enum fib_node_bw_reason_flag_t_ {
FIB_NODE_BW_REASON_FLAG_INTERFACE_DOWN = (1 << FIB_NODE_BW_REASON_INTERFACE_DOWN),
FIB_NODE_BW_REASON_FLAG_INTERFACE_DELETE = (1 << FIB_NODE_BW_REASON_INTERFACE_DELETE),
FIB_NODE_BW_REASON_FLAG_ADJ_UPDATE = (1 << FIB_NODE_BW_REASON_ADJ_UPDATE),
+ FIB_NODE_BW_REASON_FLAG_ADJ_MTU = (1 << FIB_NODE_BW_REASON_ADJ_MTU),
FIB_NODE_BW_REASON_FLAG_ADJ_DOWN = (1 << FIB_NODE_BW_REASON_ADJ_DOWN),
} __attribute__ ((packed)) fib_node_bw_reason_flag_t;
diff --git a/src/vnet/fib/fib_path.c b/src/vnet/fib/fib_path.c
index f48b64484cb..01140d5d0dc 100644
--- a/src/vnet/fib/fib_path.c
+++ b/src/vnet/fib/fib_path.c
@@ -999,6 +999,7 @@ fib_path_back_walk_notify (fib_node_t *node,
&path->fp_dpo);
}
if ((FIB_NODE_BW_REASON_FLAG_ADJ_UPDATE & ctx->fnbw_reason) ||
+ (FIB_NODE_BW_REASON_FLAG_ADJ_MTU & ctx->fnbw_reason) ||
(FIB_NODE_BW_REASON_FLAG_ADJ_DOWN & ctx->fnbw_reason))
{
/*