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authorMatthew Smith <mgsmith@netgate.com>2021-05-06 13:16:42 -0500
committerNeale Ranns <neale@graphiant.com>2021-05-21 11:51:38 +0000
commite2353a7f6c680ef50bc41892a4503168406b7787 (patch)
tree11adbd850e95faba297973cc634e4fb1010e9c1b /src/plugins
parentdebb352df9ca40170534f1e3449934a02110db96 (diff)
linux-cp: Add delegate to adjacencies
Type: improvement When an adjacency is created, add the linux-cp delegate on the new adjacency so we can later deal with modifications & deletions in our cache of adjacency data. Add a pool of hash keys and associate the pool index for a particular key with the adj_delegate_t. If the rewrite on an adjacency is changed, this will allow us to delete the old hash table entry and it will not become orphaned. Signed-off-by: Matthew Smith <mgsmith@netgate.com> Change-Id: I072b960c02cf377d66f7d18b8c0e9e05824a0ca3
Diffstat (limited to 'src/plugins')
-rw-r--r--src/plugins/linux-cp/lcp_adj.c84
1 files changed, 74 insertions, 10 deletions
diff --git a/src/plugins/linux-cp/lcp_adj.c b/src/plugins/linux-cp/lcp_adj.c
index 9a08591a0c1..cbeb91a75a1 100644
--- a/src/plugins/linux-cp/lcp_adj.c
+++ b/src/plugins/linux-cp/lcp_adj.c
@@ -20,6 +20,7 @@
#include <vppinfra/bihash_template.c>
static adj_delegate_type_t adj_type;
+static lcp_adj_key_t *adj_keys;
/**
* The table of adjacencies indexed by the rewrite string
@@ -50,23 +51,79 @@ lcp_adj_delegate_adj_deleted (adj_delegate_t *aed)
lcp_adj_mk_key_adj (adj, &kv.k);
BV (clib_bihash_add_del) (&lcp_adj_tbl, &kv.kv, 0);
+
+ if (aed->ad_index != INDEX_INVALID)
+ pool_put_index (adj_keys, aed->ad_index);
}
+/* when an adj is modified:
+ *
+ * An existing hash entry may need to be deleted. This may occur when:
+ * * The newly modified adj does not have IP_LOOKUP_NEXT_REWRITE as next idx
+ * * The rewrite (== major component of hash key) changed
+ *
+ * A new hash entry may need to be added. This may occur when:
+ * * The newly modified adj has IP_LOOKUP_NEXT_REWRITE as next idx
+ * * The rewrite changed or there was no existing hash entry
+ */
static void
lcp_adj_delegate_adj_modified (adj_delegate_t *aed)
{
ip_adjacency_t *adj;
lcp_adj_kv_t kv;
+ lcp_adj_key_t *adj_key = NULL;
+ u8 save_adj, key_changed;
+
+ key_changed = 0;
adj = adj_get (aed->ad_adj_index);
+ save_adj = (IP_LOOKUP_NEXT_REWRITE == adj->lookup_next_index);
- if (IP_LOOKUP_NEXT_REWRITE != adj->lookup_next_index)
- return;
+ if (aed->ad_index != INDEX_INVALID)
+ adj_key = pool_elt_at_index (adj_keys, aed->ad_index);
- lcp_adj_mk_key_adj (adj, &kv.k);
- kv.v = aed->ad_adj_index;
+ /* return if there was no stored adj and we will not add one */
+ if (!adj_key && !save_adj)
+ return;
- BV (clib_bihash_add_del) (&lcp_adj_tbl, &kv.kv, 1);
+ /* build kv if a new entry should be stored */
+ if (save_adj)
+ {
+ lcp_adj_mk_key_adj (adj, &kv.k);
+ kv.v = aed->ad_adj_index;
+ if (adj_key)
+ key_changed = (clib_memcmp (adj_key, &kv.k, sizeof (*adj_key)) != 0);
+ }
+
+ /* delete old entry if needed */
+ if (adj_key && ((save_adj && key_changed) || (!save_adj)))
+ {
+ lcp_adj_kv_t old_kv;
+
+ clib_memcpy_fast (&old_kv.k, adj_key, sizeof (*adj_key));
+ old_kv.v = 0;
+
+ BV (clib_bihash_add_del) (&lcp_adj_tbl, &old_kv.kv, 0);
+
+ if (!save_adj)
+ {
+ pool_put (adj_keys, adj_key);
+ aed->ad_index = INDEX_INVALID;
+ }
+ }
+
+ /* add new entry if needed */
+ if (save_adj)
+ {
+ BV (clib_bihash_add_del) (&lcp_adj_tbl, &kv.kv, 1);
+
+ if (!adj_key)
+ {
+ pool_get (adj_keys, adj_key);
+ aed->ad_index = adj_key - adj_keys;
+ }
+ clib_memcpy_fast (adj_key, &kv.k, sizeof (*adj_key));
+ }
}
static void
@@ -74,16 +131,23 @@ lcp_adj_delegate_adj_created (adj_index_t ai)
{
ip_adjacency_t *adj;
lcp_adj_kv_t kv;
+ index_t lai = INDEX_INVALID;
+ lcp_adj_key_t *adj_key;
adj = adj_get (ai);
- if (IP_LOOKUP_NEXT_REWRITE != adj->lookup_next_index)
- return;
+ if (IP_LOOKUP_NEXT_REWRITE == adj->lookup_next_index)
+ {
+ lcp_adj_mk_key_adj (adj, &kv.k);
+ pool_get (adj_keys, adj_key);
+ clib_memcpy_fast (adj_key, &kv.k, sizeof (*adj_key));
+ kv.v = ai;
- lcp_adj_mk_key_adj (adj, &kv.k);
- kv.v = ai;
+ BV (clib_bihash_add_del) (&lcp_adj_tbl, &kv.kv, 1);
+ lai = adj_key - adj_keys;
+ }
- BV (clib_bihash_add_del) (&lcp_adj_tbl, &kv.kv, 1);
+ adj_delegate_add (adj, adj_type, lai);
}
u8 *