vcl: avoid reusing user provided events in lt mode

Epoll events might not have been cleared by user so always compute event
flags locally and assign to user provided epoll event.

Type: fix

Signed-off-by: Ping Yu <ping.yu@intel.com>
Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: I3b594a0fd7be345a0e0ad81d1d3636e9354cc15d

diff --git a/src/vcl/vppcom.c b/src/vcl/vppcom.c
index 0b4d757..ecbbf7a 100644 (file)
--- a/src/vcl/vppcom.c
+++ b/src/vcl/vppcom.c
@@ -3369,7 +3369,7 @@ static void
 vcl_epoll_wait_handle_lt (vcl_worker_t *wrk, struct epoll_event *events,
                          int maxevents, u32 *n_evts)
 {
-  u32 add_event = 0, next, *to_remove = 0, *si;
+  u32 add_event = 0, evt_flags = 0, next, *to_remove = 0, *si;
   vcl_session_t *s;
   u64 evt_data;
   int rv;
@@ -3387,26 +3387,28 @@ vcl_epoll_wait_handle_lt (vcl_worker_t *wrk, struct epoll_event *events,
       if ((s->vep.ev.events & EPOLLIN) && (rv = vcl_session_read_ready (s)))
        {
          add_event = 1;
-         events[*n_evts].events |= rv > 0 ? EPOLLIN : EPOLLHUP | EPOLLRDHUP;
+         evt_flags |= rv > 0 ? EPOLLIN : EPOLLHUP | EPOLLRDHUP;
          evt_data = s->vep.ev.data.u64;
        }
       if ((s->vep.ev.events & EPOLLOUT) && (rv = vcl_session_write_ready (s)))
        {
          add_event = 1;
-         events[*n_evts].events |= rv > 0 ? EPOLLOUT : EPOLLHUP | EPOLLRDHUP;
+         evt_flags |= rv > 0 ? EPOLLOUT : EPOLLHUP | EPOLLRDHUP;
          evt_data = s->vep.ev.data.u64;
        }
       if (!add_event && s->session_state > VCL_STATE_READY)
        {
          add_event = 1;
-         events[*n_evts].events |= EPOLLHUP | EPOLLRDHUP;
+         evt_flags |= EPOLLHUP | EPOLLRDHUP;
          evt_data = s->vep.ev.data.u64;
        }
       if (add_event)
        {
+         events[*n_evts].events = evt_flags;
          events[*n_evts].data.u64 = evt_data;
          *n_evts += 1;
          add_event = 0;
+         evt_flags = 0;
          if (EPOLLONESHOT & s->vep.ev.events)
            s->vep.ev.events = 0;
          if (*n_evts == maxevents)