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authorBenoît Ganne <bganne@cisco.com>2023-02-21 16:09:47 +0100
committerDave Wallace <dwallacelf@gmail.com>2023-05-19 21:14:52 +0000
commite211ac4886d0ae51c08f77c76ed37b76f01f7629 (patch)
tree040d3e41b1cbc4e3cf31fbfec9e3308786eb07cc /src/plugins
parent168bb1d55efeba716bd3004a1f3d19cf25c15191 (diff)
fib: fix load-balance and replicate dpos buckets overflow
load-balance and replicate dpos both store their number of buckets as u16, which can overflow if too many paths are configured. For load-balance it can happens quite quickly because of weights normalization. Type: fix Change-Id: I0c78c39fc3d40626dfc58b49e7d99d71f9852b50 Signed-off-by: Benoît Ganne <bganne@cisco.com>
Diffstat (limited to 'src/plugins')
-rw-r--r--src/plugins/unittest/fib_test.c123
1 files changed, 79 insertions, 44 deletions
diff --git a/src/plugins/unittest/fib_test.c b/src/plugins/unittest/fib_test.c
index d417d5ff6ea..fbac809d726 100644
--- a/src/plugins/unittest/fib_test.c
+++ b/src/plugins/unittest/fib_test.c
@@ -781,6 +781,69 @@ fib_test_validate_entry (fib_node_index_t fei,
}
static int
+fib_test_multipath_v4 (const test_main_t *tm, const u32 fib_index,
+ const fib_prefix_t *pfx, const int n_paths,
+ const int expected_n_buckets)
+{
+ const int path_list_pool_size = fib_path_list_pool_size();
+ const int path_list_db_size = fib_path_list_db_size();
+ const int entry_pool_size = fib_entry_pool_size();
+ fib_route_path_t *r_paths = NULL;
+ const load_balance_t *lb;
+ const dpo_id_t *dpo;
+ u32 fei;
+ int res = 0;
+ int i;
+
+ for (i = 0; i < n_paths; i++)
+ {
+ fib_route_path_t r_path = {
+ .frp_proto = DPO_PROTO_IP4,
+ .frp_addr = {
+ .ip4.as_u32 = clib_host_to_net_u32(0x0a0a0a02 + i),
+ },
+ .frp_sw_if_index = tm->hw[0]->sw_if_index,
+ .frp_weight = 1,
+ .frp_fib_index = ~0,
+ .frp_flags = FIB_ROUTE_PATH_ATTACHED,
+ };
+ vec_add1(r_paths, r_path);
+ }
+
+ fib_table_entry_update(fib_index,
+ pfx,
+ FIB_SOURCE_API,
+ FIB_ENTRY_FLAG_NONE,
+ r_paths);
+
+ fei = fib_table_lookup_exact_match(fib_index, pfx);
+ FIB_TEST((FIB_NODE_INDEX_INVALID != fei), "prefix present");
+ dpo = fib_entry_contribute_ip_forwarding(fei);
+
+ lb = load_balance_get(dpo->dpoi_index);
+ FIB_TEST((lb->lb_n_buckets == expected_n_buckets),
+ "prefix lb over %d paths", lb->lb_n_buckets);
+
+ fib_table_entry_delete(fib_index,
+ pfx,
+ FIB_SOURCE_API);
+ FIB_TEST(FIB_NODE_INDEX_INVALID ==
+ fib_table_lookup_exact_match(fib_index, pfx), "prefix removed");
+ vec_free(r_paths);
+
+ /*
+ * add-remove test. no change.
+ */
+ FIB_TEST((path_list_db_size == fib_path_list_db_size()),
+ "path list DB population:%d", fib_path_list_db_size());
+ FIB_TEST((path_list_pool_size == fib_path_list_pool_size()),
+ "path list pool size is %d", fib_path_list_pool_size());
+ FIB_TEST((entry_pool_size == fib_entry_pool_size()),
+ "entry pool size is %d", fib_entry_pool_size());
+ return res;
+}
+
+static int
fib_test_v4 (void)
{
/*
@@ -3614,52 +3677,26 @@ fib_test_v4 (void)
/*
* A route with multiple paths at once
*/
- fib_route_path_t *r_paths = NULL;
+ FIB_TEST(0 ==
+ fib_test_multipath_v4(tm, fib_index, &pfx_4_4_4_4_s_32, 4, 4),
+ "multipath with 4 nexthops");
- for (ii = 0; ii < 4; ii++)
- {
- fib_route_path_t r_path = {
- .frp_proto = DPO_PROTO_IP4,
- .frp_addr = {
- .ip4.as_u32 = clib_host_to_net_u32(0x0a0a0a02 + ii),
- },
- .frp_sw_if_index = tm->hw[0]->sw_if_index,
- .frp_weight = 1,
- .frp_fib_index = ~0,
- };
- vec_add1(r_paths, r_path);
- }
-
- fib_table_entry_update(fib_index,
- &pfx_4_4_4_4_s_32,
- FIB_SOURCE_API,
- FIB_ENTRY_FLAG_NONE,
- r_paths);
-
- fei = fib_table_lookup_exact_match(fib_index, &pfx_4_4_4_4_s_32);
- FIB_TEST((FIB_NODE_INDEX_INVALID != fei), "4.4.4.4/32 present");
- dpo = fib_entry_contribute_ip_forwarding(fei);
-
- lb = load_balance_get(dpo->dpoi_index);
- FIB_TEST((lb->lb_n_buckets == 4), "4.4.4.4/32 lb over %d paths", lb->lb_n_buckets);
-
- fib_table_entry_delete(fib_index,
- &pfx_4_4_4_4_s_32,
- FIB_SOURCE_API);
- FIB_TEST(FIB_NODE_INDEX_INVALID ==
- fib_table_lookup_exact_match(fib_index, &pfx_4_4_4_4_s_32),
- "4.4.4.4/32 removed");
- vec_free(r_paths);
+ /*
+ * A route with lots of multiple paths that will overflow max supported
+ * lb buckets because of normalization
+ */
+ FIB_TEST(0 ==
+ fib_test_multipath_v4(tm, fib_index, &pfx_4_4_4_4_s_32,
+ LB_MAX_BUCKETS / 2 + 23, LB_MAX_BUCKETS),
+ "multipath with too many nexthops");
/*
- * add-remove test. no change.
+ * A route with more paths than max supported lb buckets
*/
- FIB_TEST((1 == fib_path_list_db_size()), "path list DB population:%d",
- fib_path_list_db_size());
- FIB_TEST((PNBR+5 == fib_path_list_pool_size()), "path list pool size is %d",
- fib_path_list_pool_size());
- FIB_TEST((ENBR+7 == fib_entry_pool_size()), "entry pool size is %d",
- fib_entry_pool_size());
+ FIB_TEST(0 ==
+ fib_test_multipath_v4 (tm, fib_index, &pfx_4_4_4_4_s_32,
+ LB_MAX_BUCKETS + 13, LB_MAX_BUCKETS),
+ "multipath with too many nexthops");
/*
* A route deag route
@@ -3698,7 +3735,6 @@ fib_test_v4 (void)
FIB_TEST(FIB_NODE_INDEX_INVALID ==
fib_table_lookup_exact_match(fib_index, &pfx_4_4_4_4_s_32),
"4.4.4.4/32 removed");
- vec_free(r_paths);
/*
* A route deag route in a source lookup table
@@ -3737,7 +3773,6 @@ fib_test_v4 (void)
FIB_TEST(FIB_NODE_INDEX_INVALID ==
fib_table_lookup_exact_match(fib_index, &pfx_4_4_4_4_s_32),
"4.4.4.4/32 removed");
- vec_free(r_paths);
/*
* add-remove test. no change.