Support setting the FDB limit through ip link. The arguments is:
- fdb_max_learned_entries: A 32-bit unsigned integer specifying the
maximum number of learned FDB entries, with 0
disabling the limit.
Also support reading back the current number of learned FDB entries in
the bridge by this count. The returned value's name is:
- fdb_cur_learned_entries: A 32-bit unsigned integer specifying the
current number of learned FDB entries.
Example:
# ip -d -j -p link show br0
[ {
...
"linkinfo": {
"info_kind": "bridge",
"info_data": {
...
"fdb_cur_learned_entries": 2,
"fdb_max_learned_entries": 0,
...
}
},
...
} ]
# ip link set br0 type bridge fdb_max_learned_entries 1024
# ip -d -j -p link show br0
[ {
...
"linkinfo": {
"info_kind": "bridge",
"info_data": {
...
"fdb_cur_learned_entries": 2,
"fdb_max_learned_entries": 1024,
...
}
},
...
} ]
Signed-off-by: Johannes Nixdorf <jnixdorf-...@avm.de>
---
include/uapi/linux/if_link.h | 2 ++
ip/iplink_bridge.c | 21 +++++++++++++++++++++
man/man8/ip-link.8.in | 9 +++++++++
3 files changed, 32 insertions(+)
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 94fb7ef9e226..5ad1e2727e0d 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -508,6 +508,8 @@ enum {
IFLA_BR_VLAN_STATS_PER_PORT,
IFLA_BR_MULTI_BOOLOPT,
IFLA_BR_MCAST_QUERIER_STATE,
+ IFLA_BR_FDB_CUR_LEARNED_ENTRIES,
+ IFLA_BR_FDB_MAX_LEARNED_ENTRIES,
__IFLA_BR_MAX,
};
diff --git a/ip/iplink_bridge.c b/ip/iplink_bridge.c
index 7e4e62c81c0c..68ed3c251945 100644
--- a/ip/iplink_bridge.c
+++ b/ip/iplink_bridge.c
@@ -34,6 +34,7 @@ static void print_explain(FILE *f)
" [ group_fwd_mask MASK ]\n"
" [ group_address ADDRESS ]\n"
" [ no_linklocal_learn NO_LINKLOCAL_LEARN ]\n"
+ " [ fdb_max_learned_entries
FDB_MAX_LEARNED_ENTRIES ]\n"
" [ vlan_filtering VLAN_FILTERING ]\n"
" [ vlan_protocol VLAN_PROTOCOL ]\n"
" [ vlan_default_pvid VLAN_DEFAULT_PVID ]\n"
@@ -168,6 +169,14 @@ static int bridge_parse_opt(struct link_util *lu, int
argc, char **argv,
bm.optval |= no_ll_learn_bit;
else
bm.optval &= ~no_ll_learn_bit;
+ } else if (matches(*argv, "fdb_max_learned_entries") == 0) {
+ __u32 fdb_max_learned_entries;
+
+ NEXT_ARG();
+ if (get_u32(&fdb_max_learned_entries, *argv, 0))
+ invarg("invalid fdb_max_learned_entries",
*argv);
+
+ addattr32(n, 1024, IFLA_BR_FDB_MAX_LEARNED_ENTRIES,
fdb_max_learned_entries);
} else if (matches(*argv, "fdb_flush") == 0) {
addattr(n, 1024, IFLA_BR_FDB_FLUSH);
} else if (matches(*argv, "vlan_default_pvid") == 0) {
@@ -544,6 +553,18 @@ static void bridge_print_opt(struct link_util *lu, FILE
*f, struct rtattr *tb[])
if (tb[IFLA_BR_GC_TIMER])
_bridge_print_timer(f, "gc_timer", tb[IFLA_BR_GC_TIMER]);
+ if (tb[IFLA_BR_FDB_CUR_LEARNED_ENTRIES])
+ print_uint(PRINT_ANY,
+ "fdb_cur_learned_entries",
+ "fdb_cur_learned_entries %u ",
+
rta_getattr_u32(tb[IFLA_BR_FDB_CUR_LEARNED_ENTRIES]));
+
+ if (tb[IFLA_BR_FDB_MAX_LEARNED_ENTRIES])
+ print_uint(PRINT_ANY,
+ "fdb_max_learned_entries",
+ "fdb_max_learned_entries %u ",
+
rta_getattr_u32(tb[IFLA_BR_FDB_MAX_LEARNED_ENTRIES]));
+
if (tb[IFLA_BR_VLAN_DEFAULT_PVID])
print_uint(PRINT_ANY,
"vlan_default_pvid",
diff --git a/man/man8/ip-link.8.in b/man/man8/ip-link.8.in
index bf3605a9fa2e..a29595858a51 100644
--- a/man/man8/ip-link.8.in
+++ b/man/man8/ip-link.8.in
@@ -1620,6 +1620,8 @@ the following additional arguments are supported:
] [
.BI no_linklocal_learn " NO_LINKLOCAL_LEARN "
] [
+.BI fdb_max_entries " FDB_MAX_ENTRIES "
+] [
.BI vlan_filtering " VLAN_FILTERING "
] [
.BI vlan_protocol " VLAN_PROTOCOL "
@@ -1731,6 +1733,13 @@ or off
When disabled, the bridge will not learn from link-local frames (default:
enabled).
+.BI fdb_max_learned_entries " FDB_MAX_LEARNED_ENTRIES "
+- set the maximum number of learned FDB entries linux may create. If
+.RI ( FDB_MAX_LEARNED_ENTRIES " == 0) "
+the feature is disabled.
+.I FDB_MAX_LEARNED_ENTRIES
+is a 32bit unsigned integer.
+
.BI vlan_filtering " VLAN_FILTERING "
- turn VLAN filtering on
.RI ( VLAN_FILTERING " > 0) "
--
2.40.1
