+static struct kmem_cache *dccp_ackvec_slab;
+static struct kmem_cache *dccp_ackvec_record_slab;
+
+static struct dccp_ackvec_record *dccp_ackvec_record_new(void)
+{
+ struct dccp_ackvec_record *avr =
+ kmem_cache_alloc(dccp_ackvec_record_slab, GFP_ATOMIC);
+
+ if (avr != NULL)
+ INIT_LIST_HEAD(&avr->dccpavr_node);
+
+ return avr;
+}
+
+static void dccp_ackvec_record_delete(struct dccp_ackvec_record *avr)
+{
+ if (unlikely(avr == NULL))
+ return;
+ /* Check if deleting a linked record */
+ WARN_ON(!list_empty(&avr->dccpavr_node));
+ kmem_cache_free(dccp_ackvec_record_slab, avr);
+}
+
+static void dccp_ackvec_insert_avr(struct dccp_ackvec *av,
+ struct dccp_ackvec_record *avr)
+{
+ /*
+ * AVRs are sorted by seqno. Since we are sending them in order, we
+ * just add the AVR at the head of the list.
+ * -sorbo.
+ */
+ if (!list_empty(&av->dccpav_records)) {
+ const struct dccp_ackvec_record *head =
+ list_entry(av->dccpav_records.next,
+ struct dccp_ackvec_record,
+ dccpavr_node);
+ BUG_ON(before48(avr->dccpavr_ack_seqno,
+ head->dccpavr_ack_seqno));
+ }
+
+ list_add(&avr->dccpavr_node, &av->dccpav_records);
+}
+