Re: [PATCH v5] testpmd: cleanup cleanly from signal

[Andrew Rybchenko]

On 11/9/22 20:29, Stephen Hemminger wrote:

Do a clean shutdown of testpmd when a signal is received;
instead of having testpmd kill itself.
This fixes problem where a signal could be received
in the middle of a PMD and then the signal handler would call
PMD's close routine which could cause a deadlock.

Added benefit is it gets rid of Windows specific code.

Fixes: d9a191a00e81 ("app/testpmd: fix quitting in container")

Cc to stable?

Signed-off-by: Stephen Hemminger <step...@networkplumber.org>

with one nit below:

Reviewed-by: Andrew Rybchenko <andrew.rybche...@oktetlabs.ru>

[snip]

@@ -4476,15 +4459,37 @@ main(int argc, char** argv)
                                prev_time = cur_time;
                                rte_delay_us_sleep(US_PER_S);
                        }
-               }
+               } else {
+                       char c;
+                       fd_set fds;

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

-               rc = read(0, &c, 1);
-               pmd_test_exit();
-               if (rc < 0)
-                       return 1;
+                       printf("Press enter to exit\n");
+
+                       FD_ZERO(&fds);
+                       FD_SET(0, &fds);
+
+                       if (select(1, &fds, NULL, NULL, NULL) <= 0) {
+                               fprintf(stderr, "Select failed: %s\n",
+                                       strerror(errno));
+                       } else if (read(0, &c, 1) <= 0) {
+                               fprintf(stderr,
+                                       "Read stdin failed: %s\n",
+                                       strerror(errno));
+                       }
+               }
+               stop_packet_forwarding();

force_quit() calls stop_packet_forwarding() if test_done is 0.
So, there is no difference in test_done == 0 case.
If test_done is not zero, stop_packet_forwarding() just logs
"Packet forwarding not started" and does nothing. So, the
difference is only in error message. Is it intentional?

+               force_quit();
        }

+#ifdef RTE_LIB_PDUMP

+       /* uninitialize packet capture framework */
+       rte_pdump_uninit();
+#endif
+#ifdef RTE_LIB_LATENCYSTATS
+       if (latencystats_enabled != 0)
+               rte_latencystats_uninit();
+#endif
+
        ret = rte_eal_cleanup();
        if (ret != 0)
                rte_exit(EXIT_FAILURE,