vcl: generate epoll events only if requested

Change-Id: I6e96607f09c18755eead2c7099e1f546bdae7b88
Signed-off-by: Florin Coras <fcoras@cisco.com>

2 files changed, 16 insertions, 17 deletions

diff --git a/src/vcl/ldp.c b/src/vcl/ldp.c
index 088c118b6ed..36cff2a67f1 100644
--- a/src/vcl/ldp.c
+++ b/src/vcl/ldp.c
@@ -2142,7 +2142,7 @@ ldp_epoll_pwait (int epfd, struct epoll_event *events, int maxevents,
 		 int timeout, const sigset_t * sigmask)
 {
   ldp_worker_ctx_t *ldpw = ldp_worker_get_current ();
-  double time_to_wait = (double) 0, time_out, now = 0;
+  double time_to_wait = (double) 0, max_time;
   int libc_epfd, rv = 0;
   vls_handle_t ep_vlsh;
 
@@ -2167,7 +2167,7 @@ ldp_epoll_pwait (int epfd, struct epoll_event *events, int maxevents,
     }
 
   time_to_wait = ((timeout >= 0) ? (double) timeout / 1000 : 0);
-  time_out = clib_time_now (&ldpw->clib_time) + time_to_wait;
+  max_time = clib_time_now (&ldpw->clib_time) + time_to_wait;
 
   libc_epfd = vls_attr (ep_vlsh, VPPCOM_ATTR_GET_LIBC_EPFD, 0, 0);
   if (PREDICT_FALSE (libc_epfd < 0))
@@ -2179,8 +2179,7 @@ ldp_epoll_pwait (int epfd, struct epoll_event *events, int maxevents,
 
   LDBG (2, "epfd %d: vep_idx %d, libc_epfd %d, events %p, maxevents %d, "
 	"timeout %d, sigmask %p: time_to_wait %.02f", epfd, ep_vlsh,
-	libc_epfd, events, maxevents, timeout, sigmask, time_to_wait,
-	time_out);
+	libc_epfd, events, maxevents, timeout, sigmask, time_to_wait);
   do
     {
       if (!ldpw->epoll_wait_vcl)
@@ -2207,11 +2206,8 @@ ldp_epoll_pwait (int epfd, struct epoll_event *events, int maxevents,
 	  if (rv != 0)
 	    goto done;
 	}
-
-      if (timeout != -1)
-	now = clib_time_now (&ldpw->clib_time);
     }
-  while (now < time_out);
+  while ((timeout == -1) || (clib_time_now (&ldpw->clib_time) < max_time));
 
 done:
   return rv;
diff --git a/src/vcl/vppcom.c b/src/vcl/vppcom.c
index f181f35ee27..c91d0f4b8b6 100644
--- a/src/vcl/vppcom.c
+++ b/src/vcl/vppcom.c
@@ -2601,31 +2601,34 @@ vcl_epoll_wait_handle_mq_event (vcl_worker_t * wrk, session_event_t * e,
       if (!(session = vcl_session_get (wrk, sid)))
 	break;
       session_events = session->vep.ev.events;
-      if (EPOLLOUT & session_events)
-	{
-	  add_event = 1;
-	  events[*num_ev].events |= EPOLLOUT;
-	  session_evt_data = session->vep.ev.data.u64;
-	}
+      if (!(EPOLLOUT & session_events))
+	break;
+      add_event = 1;
+      events[*num_ev].events |= EPOLLOUT;
+      session_evt_data = session->vep.ev.data.u64;
       break;
     case SESSION_CTRL_EVT_DISCONNECTED:
       disconnected_msg = (session_disconnected_msg_t *) e->data;
       session = vcl_session_disconnected_handler (wrk, disconnected_msg);
       if (!session)
 	break;
+      session_events = session->vep.ev.events;
+      if (!((EPOLLHUP | EPOLLRDHUP) & session_events))
+	break;
       add_event = 1;
       events[*num_ev].events |= EPOLLHUP | EPOLLRDHUP;
       session_evt_data = session->vep.ev.data.u64;
-      session_events = session->vep.ev.events;
       break;
     case SESSION_CTRL_EVT_RESET:
       sid = vcl_session_reset_handler (wrk, (session_reset_msg_t *) e->data);
       if (!(session = vcl_session_get (wrk, sid)))
 	break;
+      session_events = session->vep.ev.events;
+      if (!((EPOLLHUP | EPOLLRDHUP) & session_events))
+	break;
       add_event = 1;
       events[*num_ev].events |= EPOLLHUP | EPOLLRDHUP;
       session_evt_data = session->vep.ev.data.u64;
-      session_events = session->vep.ev.events;
       break;
     case SESSION_CTRL_EVT_REQ_WORKER_UPDATE:
       vcl_session_req_worker_update_handler (wrk, e->data);
@@ -2710,7 +2713,7 @@ vppcom_epoll_wait_condvar (vcl_worker_t * wrk, struct epoll_event *events,
   double total_wait = 0, wait_slice;
   int rv;
 
-  wait_for_time = (wait_for_time == -1) ? (double) 10e9 : wait_for_time;
+  wait_for_time = (wait_for_time == -1) ? (double) 1e6 : wait_for_time;
   wait_slice = wrk->cut_through_registrations ? 10e-6 : wait_for_time;
 
   do