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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/dpo/mpls_label_dpo.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/dpo/mpls_label_dpo.c')
-rw-r--r--src/vnet/dpo/mpls_label_dpo.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/src/vnet/dpo/mpls_label_dpo.c b/src/vnet/dpo/mpls_label_dpo.c
index 683b5449513..b87cb1efcd2 100644
--- a/src/vnet/dpo/mpls_label_dpo.c
+++ b/src/vnet/dpo/mpls_label_dpo.c
@@ -18,6 +18,8 @@
#include <vnet/mpls/mpls.h>
#include <vnet/dpo/drop_dpo.h>
+// clang-format off
+
#ifndef CLIB_MARCH_VARIANT
/*
* pool of all MPLS Label DPOs
@@ -1213,12 +1215,25 @@ mpls_label_interpose (const dpo_id_t *original,
mpls_label_dpo_get_index(mld_clone));
}
+static u16
+mpls_label_dpo_get_mtu (const dpo_id_t *dpo)
+{
+ mpls_label_dpo_t *mld;
+
+ mld = mpls_label_dpo_get(dpo->dpoi_index);
+
+ /* return the parent's MTU minus the amount of header
+ * this DPO imposes */
+ return (dpo_get_mtu (&mld->mld_dpo) - sizeof(mpls_label_t) * mld->mld_n_labels);
+}
+
const static dpo_vft_t mld_vft = {
.dv_lock = mpls_label_dpo_lock,
.dv_unlock = mpls_label_dpo_unlock,
.dv_format = format_mpls_label_dpo,
.dv_mem_show = mpls_label_dpo_mem_show,
.dv_mk_interpose = mpls_label_interpose,
+ .dv_get_mtu = mpls_label_dpo_get_mtu,
};
const static char* const mpls_label_imp_pipe_ip4_nodes[] =
@@ -1337,3 +1352,5 @@ mpls_label_dpo_get_type (mpls_label_dpo_flags_t flags)
return (mpls_label_dpo_types[flags]);
}
#endif /* CLIB_MARCH_VARIANT */
+
+// clang-format on