[Bug 1305] testpmd: early exit with tap driver in non interactive mode

[bugzilla@dpdk.org]

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https://bugs.dpdk.org/show_bug.cgi?id=1305

            Bug ID: 1305
           Summary: testpmd: early exit with tap driver in non interactive
                    mode
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: testpmd
          Assignee: dev@dpdk.org
          Reporter: david.marchand@redhat.com
  Target Milestone: ---

Reported by Frode, while running OVS-DPDK unit tests.

testpmd behavior changed with commit 0fd1386c30c3 ("app/testpmd: cleanup
cleanly from signal"). Any signal makes testpmd quit.

This can be problematic with the tap driver which uses internal signalling.


Reproducer with strace to illustrate the issue:

$ sudo strace -f -e trace=file build-clang/app/dpdk-testpmd -c 3 --no-huge -m
40 -a 0:0.0 --vdev net_tap0 -- --no-mlockall --total-num-mbufs=2048 -a

...

No commandline core given, start packet forwarding
io packet forwarding - ports=1 - cores=1 - streams=1 - NUMA support enabled, MP
allocation mode: native
Logical Core 1 (socket 0) forwards packets on 1 streams:
  RX P=0/Q=0 (socket 0) -> TX P=0/Q=0 (socket 0) peer=02:00:00:00:00:00

[pid 3780703] --- SIGRT_3 {si_signo=SIGRT_3, si_code=0x1, si_pid=65, si_uid=0,
si_int=22, si_ptr=0x16} ---
  io packet forwarding packets/burst=32
  nb forwarding cores=1 - nb forwarding ports=1
  port 0: RX queue number: 1 Tx queue number: 1
    Rx offloads=0x0 Tx offloads=0x0
    RX queue: 0
      RX desc=0 - RX free threshold=0
      RX threshold registers: pthresh=0 hthresh=0  wthresh=0
      RX Offloads=0x0
    TX queue: 0
      TX desc=0 - TX free threshold=0
      TX threshold registers: pthresh=0 hthresh=0  wthresh=0
      TX offloads=0x0 - TX RS bit threshold=0
Press enter to exit
[pid 3780703] --- SIGRT_3 {si_signo=SIGRT_3, si_code=0x1, si_pid=65, si_uid=0,
si_int=22, si_ptr=0x16} ---
Telling cores to stop...
Waiting for lcores to finish...

  ---------------------- Forward statistics for port 0  ----------------------
  RX-packets: 1              RX-dropped: 0             RX-total: 1
  TX-packets: 1              TX-dropped: 0             TX-total: 1
  ----------------------------------------------------------------------------

  +++++++++++++++ Accumulated forward statistics for all ports+++++++++++++++
  RX-packets: 1              RX-dropped: 0             RX-total: 1
  TX-packets: 1              TX-dropped: 0             TX-total: 1
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Done.

Stopping port 0...
Stopping ports...
Done

Shutting down port 0...
Closing ports...
Port 0 is closed
Done

Bye...
[pid 3780705] --- SIGRTMIN {si_signo=SIGRTMIN, si_code=SI_TKILL,
si_pid=3780703, si_uid=0} ---
[pid 3780705] +++ exited with 0 +++
[pid 3780703] unlink("/var/run/dpdk/rte/mp_socket") = 0
[pid 3780703] unlink("/var/run/dpdk/rte/dpdk_telemetry.v2:1") = 0
==3780703==LeakSanitizer has encountered a fatal error.
==3780703==HINT: For debugging, try setting environment variable
LSAN_OPTIONS=verbosity=1:log_threads=1
==3780703==HINT: LeakSanitizer does not work under ptrace (strace, gdb, etc)
[pid 3780710] +++ exited with 1 +++
[pid 3780704] +++ exited with 1 +++
[pid 3780706] +++ exited with 1 +++
+++ exited with 1 +++


A quick fix I tried:
diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 595b77748c..57d257623e 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -4743,22 +4743,11 @@ main(int argc, char** argv)
                        }
                } else {
                        char c;
-                       fd_set fds;

                        printf("Press enter to exit\n");

-                       FD_ZERO(&fds);
-                       FD_SET(0, &fds);
-
-                       /* wait for signal or enter */
-                       ret = select(1, &fds, NULL, NULL, NULL);
-                       if (ret < 0 && errno != EINTR)
-                               rte_exit(EXIT_FAILURE,
-                                        "Select failed: %s\n",
-                                        strerror(errno));
-
                        /* if got enter then consume it */
-                       if (ret == 1 && read(0, &c, 1) < 0)
+                       if (read(0, &c, 1) < 0 && errno != EINTR)
                                rte_exit(EXIT_FAILURE,
                                         "Read failed: %s\n",
                                         strerror(errno));

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