session: support half-close connection

[vpp.git] / src / vnet / session / transport.c

diff --git a/src/vnet/session/transport.c b/src/vnet/session/transport.c
index 967ff5d..2c88a4c 100644 (file)
--- a/src/vnet/session/transport.c
+++ b/src/vnet/session/transport.c
@@ -124,14 +124,14 @@ u8 *
 format_transport_half_open_connection (u8 * s, va_list * args)
 {
   u32 transport_proto = va_arg (*args, u32);
-  u32 listen_index = va_arg (*args, u32);
+  u32 ho_index = va_arg (*args, u32);
   transport_proto_vft_t *tp_vft;
 
   tp_vft = transport_protocol_get_vft (transport_proto);
   if (!tp_vft)
     return s;
 
-  s = format (s, "%U", tp_vft->format_half_open, listen_index);
+  s = format (s, "%U", tp_vft->format_half_open, ho_index);
   return s;
 }
 
@@ -317,6 +317,13 @@ transport_connect (transport_proto_t tp, transport_endpoint_cfg_t * tep)
   return tp_vfts[tp].connect (tep);
 }
 
+void
+transport_half_close (transport_proto_t tp, u32 conn_index, u8 thread_index)
+{
+  if (tp_vfts[tp].half_close)
+    tp_vfts[tp].half_close (conn_index, thread_index);
+}
+
 void
 transport_close (transport_proto_t tp, u32 conn_index, u8 thread_index)
 {
@@ -399,6 +406,17 @@ transport_get_listener_endpoint (transport_proto_t tp, u32 conn_index,
     }
 }
 
+int
+transport_connection_attribute (transport_proto_t tp, u32 conn_index,
+                               u8 thread_index, u8 is_get,
+                               transport_endpt_attr_t *attr)
+{
+  if (!tp_vfts[tp].attribute)
+    return -1;
+
+  return tp_vfts[tp].attribute (conn_index, thread_index, is_get, attr);
+}
+
 #define PORT_MASK ((1 << 16)- 1)
 
 void
@@ -632,9 +650,9 @@ format_transport_pacer (u8 * s, va_list * args)
 
   now = transport_us_time_now (thread_index);
   diff = now - pacer->last_update;
-  s = format (s, "rate %lu bucket %lu t/p %.3f last_update %U idle %u",
+  s = format (s, "rate %lu bucket %ld t/p %.3f last_update %U burst %u",
              pacer->bytes_per_sec, pacer->bucket, pacer->tokens_per_period,
-             format_clib_us_time, diff, pacer->idle_timeout_us);
+             format_clib_us_time, diff, pacer->max_burst);
   return s;
 }
 
@@ -644,38 +662,46 @@ spacer_max_burst (spacer_t * pacer, clib_us_time_t time_now)
   u64 n_periods = (time_now - pacer->last_update);
   u64 inc;
 
-  if (PREDICT_FALSE (n_periods > pacer->idle_timeout_us))
-    {
-      pacer->last_update = time_now;
-      pacer->bucket = TRANSPORT_PACER_MIN_BURST;
-      return TRANSPORT_PACER_MIN_BURST;
-    }
-
   if ((inc = (f32) n_periods * pacer->tokens_per_period) > 10)
     {
       pacer->last_update = time_now;
-      pacer->bucket = clib_min (pacer->bucket + inc, pacer->bytes_per_sec);
+      pacer->bucket = clib_min (pacer->bucket + inc, pacer->max_burst);
     }
 
-  return clib_min (pacer->bucket, TRANSPORT_PACER_MAX_BURST);
+  return pacer->bucket > 0 ? pacer->max_burst : 0;
 }
 
 static inline void
 spacer_update_bucket (spacer_t * pacer, u32 bytes)
 {
-  ASSERT (pacer->bucket >= bytes);
   pacer->bucket -= bytes;
 }
 
 static inline void
 spacer_set_pace_rate (spacer_t * pacer, u64 rate_bytes_per_sec,
-                     clib_us_time_t rtt)
+                     clib_us_time_t rtt, clib_time_type_t sec_per_loop)
 {
+  clib_us_time_t max_time;
+
   ASSERT (rate_bytes_per_sec != 0);
   pacer->bytes_per_sec = rate_bytes_per_sec;
   pacer->tokens_per_period = rate_bytes_per_sec * CLIB_US_TIME_PERIOD;
-  pacer->idle_timeout_us = clib_max (rtt * TRANSPORT_PACER_IDLE_FACTOR,
-                                    TRANSPORT_PACER_MIN_IDLE);
+
+  /* Allow a min number of bursts per rtt, if their size is acceptable. Goal
+   * is to spread the sending of data over the rtt but to also allow for some
+   * coalescing that can potentially
+   * 1) reduce load on session layer by reducing scheduling frequency for a
+   *    session and
+   * 2) optimize sending when tso if available
+   *
+   * Max "time-length" of a burst cannot be less than 1us or more than 1ms.
+   */
+  max_time = clib_max (rtt / TRANSPORT_PACER_BURSTS_PER_RTT,
+                      (clib_us_time_t) (sec_per_loop * CLIB_US_TIME_FREQ));
+  max_time = clib_clamp (max_time, 1 /* 1us */ , 1000 /* 1ms */ );
+  pacer->max_burst = (rate_bytes_per_sec * max_time) * CLIB_US_TIME_PERIOD;
+  pacer->max_burst = clib_clamp (pacer->max_burst, TRANSPORT_PACER_MIN_BURST,
+                                TRANSPORT_PACER_MAX_BURST);
 }
 
 static inline u64
@@ -696,7 +722,8 @@ transport_connection_tx_pacer_reset (transport_connection_t * tc,
                                     u64 rate_bytes_per_sec, u32 start_bucket,
                                     clib_us_time_t rtt)
 {
-  spacer_set_pace_rate (&tc->pacer, rate_bytes_per_sec, rtt);
+  spacer_set_pace_rate (&tc->pacer, rate_bytes_per_sec, rtt,
+                       transport_seconds_per_loop (tc->thread_index));
   spacer_reset (&tc->pacer, transport_us_time_now (tc->thread_index),
                start_bucket);
 }
@@ -722,7 +749,8 @@ void
 transport_connection_tx_pacer_update (transport_connection_t * tc,
                                      u64 bytes_per_sec, clib_us_time_t rtt)
 {
-  spacer_set_pace_rate (&tc->pacer, bytes_per_sec, rtt);
+  spacer_set_pace_rate (&tc->pacer, bytes_per_sec, rtt,
+                       transport_seconds_per_loop (tc->thread_index));
 }
 
 u32
@@ -752,6 +780,12 @@ transport_connection_tx_pacer_update_bytes (transport_connection_t * tc,
   spacer_update_bucket (&tc->pacer, bytes);
 }
 
+void
+transport_update_pacer_time (u32 thread_index, clib_time_type_t now)
+{
+  session_wrk_update_time (session_main_get_worker (thread_index), now);
+}
+
 void
 transport_connection_reschedule (transport_connection_t * tc)
 {