+static int tfrc_rx_hist_alloc(struct tfrc_rx_hist *h)
+{
+ int i;
+
+ memset(h, 0, sizeof(*h));
+
+ for (i = 0; i <= TFRC_NDUPACK; i++) {
+ h->ring[i] = kmem_cache_alloc(tfrc_rx_hist_slab, GFP_ATOMIC);
+ if (h->ring[i] == NULL) {
+ tfrc_rx_hist_purge(h);
+ return -ENOBUFS;
+ }
+ }
+ return 0;
+}
+
+int tfrc_rx_hist_init(struct tfrc_rx_hist *h, struct sock *sk)
+{
+ if (tfrc_rx_hist_alloc(h))
+ return -ENOBUFS;
+ /*
+ * Initialise first entry with GSR to start loss detection as early as
+ * possible. Code using this must not use any other fields. The entry
+ * will be overwritten once the CCID updates its received packets.
+ */
+ tfrc_rx_hist_loss_prev(h)->tfrchrx_seqno = dccp_sk(sk)->dccps_gsr;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tfrc_rx_hist_init);
+