+/*
+ * Accumulate acked bytes for cwnd increase
+ *
+ * Once threshold bytes are accumulated, snd_mss bytes are added
+ * to the cwnd.
+ */
+always_inline void
+tcp_cwnd_accumulate (tcp_connection_t * tc, u32 thresh, u32 bytes)
+{
+ tc->cwnd_acc_bytes += bytes;
+ if (tc->cwnd_acc_bytes >= thresh)
+ {
+ u32 inc = tc->cwnd_acc_bytes / thresh;
+ tc->cwnd_acc_bytes -= inc * thresh;
+ tc->cwnd += inc * tc->snd_mss;
+ tc->cwnd = clib_min (tc->cwnd, tc->tx_fifo_size);
+ }
+}
+