etcp_router: consumer-driven ACK with interval throttle (10ms)

- consumer_ack flag: ACK sent only on consumption, not assembly
- etcp_router_consumer_ack() — called from tcp_proxy_client feed_from_transport
- last_ack_sent_tb: interval-based throttle — send immediately if >=10ms passed,
  otherwise timer for remaining time
- timer rules: NULL handle after cancel/fire, NULL check before start
- ROUTER_ACK_INTERVAL_TB 1000→100 (100ms→10ms)
- test_etcp_router_unit: updated test 14 for new immediate-send behavior

src/etcp_router.c

@@ -191,14 +191,10 @@ static void router_enqueue_send(struct ETCP_ROUTER_CONN* rconn, const uint8_t* p
 // ACK timers
 // ====================================================================
 
-static void router_schedule_ack(struct ETCP_ROUTER_CONN* rconn) {
-    if (rconn->idle_ack_timer) {
-        uasync_cancel_timeout(rconn->inst->ua, rconn->idle_ack_timer);
-        rconn->idle_ack_timer = NULL;
-    }
-    if (!rconn->ack_timer)
-        rconn->ack_timer = uasync_set_timeout(rconn->inst->ua,
-            ROUTER_ACK_INTERVAL_TB, rconn, router_ack_timer_cb, "router_ack");
+static void router_ack_do_send(struct ETCP_ROUTER_CONN* rconn) {
+    router_send_ack(rconn);
+    rconn->last_sent_ack_seq = rconn->rx_seq;
+    rconn->last_ack_sent_tb  = get_time_tb();
 }
 
 static void router_send_ack(struct ETCP_ROUTER_CONN* rconn) {
@@ -227,28 +223,43 @@ static void router_send_ack(struct ETCP_ROUTER_CONN* rconn) {
     etcp_send(conn, entry);
 }
 
+static void router_schedule_ack(struct ETCP_ROUTER_CONN* rconn) {
+    if (rconn->idle_ack_timer) {
+        uasync_cancel_timeout(rconn->inst->ua, rconn->idle_ack_timer);
+        rconn->idle_ack_timer = NULL;
+    }
+    if (rconn->rx_seq == rconn->last_sent_ack_seq) return;
+    uint64_t now = get_time_tb();
+    uint64_t elapsed = now - rconn->last_ack_sent_tb;
+    if (elapsed >= ROUTER_ACK_INTERVAL_TB) {
+        router_ack_do_send(rconn);
+        return;
+    }
+    if (!rconn->ack_timer)
+        rconn->ack_timer = uasync_set_timeout(rconn->inst->ua,
+            ROUTER_ACK_INTERVAL_TB - (uint32_t)elapsed, rconn, router_ack_timer_cb, "router_ack");
+}
+
 static void router_ack_timer_cb(void* arg) {
     struct ETCP_ROUTER_CONN* rconn = (struct ETCP_ROUTER_CONN*)arg;
     rconn->ack_timer = NULL;
-    if (rconn->rx_seq != rconn->last_sent_ack_seq) {
-        router_send_ack(rconn);
-        rconn->last_sent_ack_seq = rconn->rx_seq;
-    }
     if (rconn->rx_seq != rconn->last_sent_ack_seq)
-        rconn->ack_timer = uasync_set_timeout(rconn->inst->ua,
-            ROUTER_ACK_INTERVAL_TB, rconn, router_ack_timer_cb, "router_ack");
-    else
+        router_ack_do_send(rconn);
+    if (rconn->rx_seq != rconn->last_sent_ack_seq) {
+        if (!rconn->ack_timer)
+            rconn->ack_timer = uasync_set_timeout(rconn->inst->ua,
+                ROUTER_ACK_INTERVAL_TB, rconn, router_ack_timer_cb, "router_ack");
+    } else if (!rconn->idle_ack_timer) {
         rconn->idle_ack_timer = uasync_set_timeout(rconn->inst->ua,
             ROUTER_ACK_IDLE_TB, rconn, router_idle_ack_timer_cb, "router_idle_ack");
+    }
 }
 
 static void router_idle_ack_timer_cb(void* arg) {
     struct ETCP_ROUTER_CONN* rconn = (struct ETCP_ROUTER_CONN*)arg;
     rconn->idle_ack_timer = NULL;
-    if (rconn->rx_seq != rconn->last_sent_ack_seq) {
-        router_send_ack(rconn);
-        rconn->last_sent_ack_seq = rconn->rx_seq;
-    }
+    if (rconn->rx_seq != rconn->last_sent_ack_seq)
+        router_ack_do_send(rconn);
 }
 
 // ====================================================================
@@ -380,7 +391,7 @@ static void etcp_router_recv_cb(struct ETCP_CONN* conn, struct ll_entry* entry)
         if (seq == rconn->rx_seq)
             router_try_assembly(rconn, conn);
 
-        router_schedule_ack(rconn);
+        if (!rconn->consumer_ack) router_schedule_ack(rconn);
         queue_dgram_free(entry); queue_entry_free(entry);
     } else {
         // ========== Транзит ==========
@@ -428,9 +439,9 @@ void etcp_router_destroy(struct UTUN_INSTANCE* inst) {
         while ((entry = queue_data_get(inst->router_conns)) != NULL) {
             struct ETCP_ROUTER_CONN* rconn = (struct ETCP_ROUTER_CONN*)entry;
             router_send_close_to_service(rconn);
-            if (rconn->ack_timer)          uasync_cancel_timeout(inst->ua, rconn->ack_timer);
-            if (rconn->idle_ack_timer)     uasync_cancel_timeout(inst->ua, rconn->idle_ack_timer);
-            if (rconn->send_resume_timer)  uasync_cancel_timeout(inst->ua, rconn->send_resume_timer);
+            if (rconn->ack_timer)          { uasync_cancel_timeout(inst->ua, rconn->ack_timer); rconn->ack_timer = NULL; }
+            if (rconn->idle_ack_timer)     { uasync_cancel_timeout(inst->ua, rconn->idle_ack_timer); rconn->idle_ack_timer = NULL; }
+            if (rconn->send_resume_timer)  { uasync_cancel_timeout(inst->ua, rconn->send_resume_timer); rconn->send_resume_timer = NULL; }
             if (rconn->recv_q) {
                 struct ll_entry* f;
                 while ((f = queue_data_get(rconn->recv_q)) != NULL) { queue_dgram_free(f); queue_entry_free(f); }
@@ -536,6 +547,13 @@ void etcp_router_waiter_cancel(struct UTUN_INSTANCE* inst, uint64_t peer_node_id
     queue_waiter_cancel(conn->normalizer->input, h);
 }
 
+void etcp_router_consumer_ack(struct UTUN_INSTANCE* inst, uint64_t remote_node_id, uint8_t svc_id) {
+    struct ETCP_ROUTER_CONN* rconn = etcp_router_conn_get(inst, remote_node_id, svc_id);
+    if (!rconn) return;
+    rconn->consumer_ack = 1;
+    router_schedule_ack(rconn);
+}
+
 // ====================================================================
 // Seq-connection API
 // ====================================================================
@@ -556,6 +574,8 @@ struct ETCP_ROUTER_CONN* etcp_router_conn_get(struct UTUN_INSTANCE* inst,
     rconn->rx_seq         = 0;
     rconn->tx_acked           = 0;
     rconn->last_sent_ack_seq  = 0;
+    rconn->consumer_ack       = 0;
+    rconn->last_ack_sent_tb  = 0;
     rconn->inst           = inst;
     rconn->ack_timer      = NULL;
     rconn->idle_ack_timer = NULL;

src/etcp_router.h

@@ -34,10 +34,12 @@ struct ETCP_ROUTER_CONN {
     uint32_t rx_seq;              // ожидаемый seq для сборки (next expected)
     uint32_t tx_acked;            // сколько наших пакетов подтвердил remote (для inflight)
     uint32_t last_sent_ack_seq;   // последний отправленный ACK (= rx_seq на момент отправки)
+    uint8_t  consumer_ack;        // 1 = ACK отправляется только при потреблении, не при сборке
+    uint64_t last_ack_sent_tb;    // время отправки последнего ACK (timebase 0.1ms)
 
     struct UTUN_INSTANCE* inst;
     struct ll_queue* recv_q;     // reorder очередь: hash по seq (4 байта, offset 0)
-    void*    ack_timer;           // периодический таймер (100ms)
+    void*    ack_timer;           // периодический таймер (10ms при consumer_ack)
     void*    idle_ack_timer;      // idle таймер (дослать последний ack)
 
     struct ll_queue* send_q;     // очередь ожидающих отправки (inflight полон)
@@ -48,7 +50,7 @@ struct ETCP_ROUTER_CONN {
 #define ROUTER_CONN_HASH_SIZE     256
 #define ROUTER_RECVQ_HASH_SIZE    1024
 #define ROUTER_MAX_INFLIGHT       256    // макс пакетов в полёте (для контроля inflight)
-#define ROUTER_ACK_INTERVAL_TB    1000   // интервал ACK: 100ms в timebase (0.1ms)
+#define ROUTER_ACK_INTERVAL_TB    100    // интервал ACK: 10ms в timebase (0.1ms)
 #define ROUTER_ACK_IDLE_TB        5000   // idle таймаут: 500ms
 #define ROUTER_SEND_RESUME_TB     500    // retry интервал send_q: 50ms
 
@@ -99,4 +101,7 @@ void etcp_router_waiter_register(struct UTUN_INSTANCE* inst, uint64_t peer_node_
 void etcp_router_waiter_cancel(struct UTUN_INSTANCE* inst, uint64_t peer_node_id,
                                 struct queue_waiter_handle* h);
 
+// Уведомить router о потреблении данных потребителем (для consumer-driven ACK)
+void etcp_router_consumer_ack(struct UTUN_INSTANCE* inst, uint64_t remote_node_id, uint8_t svc_id);
+
 #endif // ETCP_ROUTER_H

src/proxy/tcp_proxy_client.c

@@ -186,6 +186,7 @@ static void tcp_proxy_client_feed_from_transport(struct tcp_proxy_client_conn *p
     }
     queue_resume_callback(pc->to_lwip);
     if (sent_any) {
+        etcp_router_consumer_ack(pc->proxy->inst, pc->proxy->via_node_id, ETCP_ID_TCP_PROXY);
         uint32_t unsent = 0; struct tcp_seg* s;
         for (s = pc->pcb->unsent; s; s = s->next) unsent++;
         DEBUG_DEBUG(DEBUG_CATEGORY_TRAFFIC, "PROXY FEED exit->client sid=%08x fed=%u q=%u->%u snd_wnd=%u cwnd=%u unsent=%u",