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-rw-r--r--src/plugins/acl/hash_lookup.c57
-rw-r--r--src/plugins/acl/hash_lookup_types.h8
2 files changed, 45 insertions, 20 deletions
diff --git a/src/plugins/acl/hash_lookup.c b/src/plugins/acl/hash_lookup.c
index 8e8c52740ee..3600faf13ea 100644
--- a/src/plugins/acl/hash_lookup.c
+++ b/src/plugins/acl/hash_lookup.c
@@ -216,26 +216,26 @@ activate_applied_ace_hash_entry(acl_main_t *am,
int res = BV (clib_bihash_search) (&am->acl_lookup_hash, &kv, &result);
if (res == 0) {
/* There already exists an entry or more. Append at the end. */
- u32 existing_index = result_val->applied_entry_index;
+ u32 first_index = result_val->applied_entry_index;
DBG("A key already exists, with applied entry index: %d", existing_index);
- ASSERT(existing_index != ~0);
- applied_hash_ace_entry_t *existing_pae = &((*applied_hash_aces)[existing_index]);
- /* walk the list to the last element */
- while (existing_pae->next_applied_entry_index != ~0) {
- if (existing_index == existing_pae->next_applied_entry_index) {
- DBG("existing and next index of entry %d are the same, abort", existing_index);
- ASSERT(existing_index != existing_pae->next_applied_entry_index);
- }
- existing_index = existing_pae->next_applied_entry_index;
- existing_pae = &((*applied_hash_aces)[existing_index]);
- DBG("...advance to chained entry index: %d", existing_index);
- }
+ ASSERT(first_index != ~0);
+ applied_hash_ace_entry_t *first_pae = &((*applied_hash_aces)[first_index]);
+ /* move to "prev" by one, this should land us in the end of the list */
+ u32 last_index = first_pae->prev_applied_entry_index;
+ ASSERT(last_index != ~0);
+ applied_hash_ace_entry_t *last_pae = &((*applied_hash_aces)[last_index]);
+ ASSERT(last_pae->next_applied_entry_index == ~0);
/* link ourseves in */
- existing_pae->next_applied_entry_index = new_index;
- pae->prev_applied_entry_index = existing_index;
+ last_pae->next_applied_entry_index = new_index;
+ pae->prev_applied_entry_index = last_index;
+ /* make a new reference from the very first element to new tail */
+ first_pae->prev_applied_entry_index = new_index;
} else {
/* It's the very first entry */
hashtable_add_del(am, &kv, 1);
+ pae->is_first_entry = 1;
+ /* we are the tail */
+ pae->prev_applied_entry_index = new_index;
}
}
@@ -306,6 +306,7 @@ hash_acl_apply(acl_main_t *am, u32 sw_if_index, u8 is_input, int acl_index)
for(i=0; i < vec_len(ha->rules); i++) {
u32 new_index = base_offset + i;
applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[new_index]);
+ pae->is_first_entry = 0;
pae->acl_index = acl_index;
pae->ace_index = ha->rules[i].ace_index;
pae->action = ha->rules[i].action;
@@ -324,14 +325,13 @@ move_applied_ace_hash_entry(acl_main_t *am,
applied_hash_ace_entry_t **applied_hash_aces,
u32 old_index, u32 new_index)
{
-
/* move the entry */
(*applied_hash_aces)[new_index] = (*applied_hash_aces)[old_index];
/* update the linkage and hash table if necessary */
applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[old_index]);
- if (pae->prev_applied_entry_index != ~0) {
+ if (!pae->is_first_entry) {
applied_hash_ace_entry_t *prev_pae = &((*applied_hash_aces)[pae->prev_applied_entry_index]);
ASSERT(prev_pae->next_applied_entry_index == old_index);
prev_pae->next_applied_entry_index = new_index;
@@ -344,6 +344,20 @@ move_applied_ace_hash_entry(acl_main_t *am,
applied_hash_ace_entry_t *next_pae = &((*applied_hash_aces)[pae->next_applied_entry_index]);
ASSERT(next_pae->prev_applied_entry_index == old_index);
next_pae->prev_applied_entry_index = new_index;
+ } else {
+ /*
+ * Moving the very last entry, so we need to update the tail pointer in the first one.
+ * find back the first entry. Inefficient so might need to be a bit cleverer
+ * if this proves to be a problem..
+ */
+ u32 an_index = pae->prev_applied_entry_index;
+ applied_hash_ace_entry_t *head_pae = &((*applied_hash_aces)[pae->prev_applied_entry_index]);
+ while(!head_pae->is_first_entry) {
+ an_index = head_pae->prev_applied_entry_index;
+ head_pae = &((*applied_hash_aces)[an_index]);
+ }
+ ASSERT(head_pae->prev_applied_entry_index == old_index);
+ head_pae->prev_applied_entry_index = new_index;
}
/* invalidate the old entry */
pae->prev_applied_entry_index = ~0;
@@ -364,13 +378,20 @@ deactivate_applied_ace_hash_entry(acl_main_t *am,
next_pae->prev_applied_entry_index = pae->prev_applied_entry_index;
}
- if (pae->prev_applied_entry_index != ~0) {
+ if (!pae->is_first_entry) {
applied_hash_ace_entry_t *prev_pae = &((*applied_hash_aces)[pae->prev_applied_entry_index]);
ASSERT(prev_pae->next_applied_entry_index == old_index);
prev_pae->next_applied_entry_index = pae->next_applied_entry_index;
} else {
/* It was the first entry. We need either to reset the hash entry or delete it */
+ pae->is_first_entry = 0;
if (pae->next_applied_entry_index != ~0) {
+ /* a custom case of relinking for the first node, with the tail not forward linked to it */
+ applied_hash_ace_entry_t *next_pae = &((*applied_hash_aces)[pae->next_applied_entry_index]);
+ /* this is the tail the new head should be aware of */
+ next_pae->prev_applied_entry_index = pae->prev_applied_entry_index;
+ next_pae->is_first_entry = 1;
+
add_del_hashtable_entry(am, sw_if_index, is_input,
applied_hash_aces, pae->next_applied_entry_index, 1);
} else {
diff --git a/src/plugins/acl/hash_lookup_types.h b/src/plugins/acl/hash_lookup_types.h
index 1c04459155c..1848c5ffc6a 100644
--- a/src/plugins/acl/hash_lookup_types.h
+++ b/src/plugins/acl/hash_lookup_types.h
@@ -53,11 +53,15 @@ typedef struct {
*/
u32 next_applied_entry_index;
/*
- * previous entry in the list of the chained ones,
- * if ~0 then this is entry in the hash.
+ * previous entry in the ring list of the chained ones.
*/
u32 prev_applied_entry_index;
/*
+ * 1 if it is the very first entry in the list,
+ * referenced from the hash.
+ */
+ u8 is_first_entry;
+ /*
* Action of this applied ACE
*/
u8 action;