dpdk/mlx5: fix shutdown crash in IPS mode

Make sure to first close all ports before freeing device mempools.

Thread 1 "Suricata-Main" received signal SIGSEGV, Segmentation fault.
0x00007ffff456a3fb in ?? () from /usr/lib/x86_64-linux-gnu/dpdk/pmds-20.0/librte_pmd_mlx5.so
(gdb) bt
 #0  0x00007ffff456a3fb in ?? () from /usr/lib/x86_64-linux-gnu/dpdk/pmds-20.0/librte_pmd_mlx5.so
 #1  0x00007ffff469a948 in ?? () from /usr/lib/x86_64-linux-gnu/dpdk/pmds-20.0/librte_pmd_mlx5.so
 #2  0x00007ffff45606aa in ?? () from /usr/lib/x86_64-linux-gnu/dpdk/pmds-20.0/librte_pmd_mlx5.so
 #3  0x00007ffff6d4ed8d in rte_eth_dev_close () from /usr/lib/x86_64-linux-gnu/librte_ethdev.so.20.0
 #4  0x000000000055fc4c in DPDKCloseDevice (ldev=ldev@entry=0xe3a400) at util-dpdk.c:53
 #5  0x000000000055f4eb in LiveDeviceListClean () at util-device.c:331
 #6  0x00000000005511c8 in GlobalsDestroy (suri=<optimized out>) at suricata.c:381
 #7  0x0000000000550a76 in SuricataMain (argc=<optimized out>, argv=<optimized out>) at suricata.c:3059
 #8  0x00007ffff6a24083 in __libc_start_main (main=0x54cca0 <main>, argc=8, argv=0x7fffffffe4c8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe4b8) at ../csu/libc-start.c:308
 #9  0x000000000054cbde in _start ()

Bug: #5619.

src/util-device.c

@@ -316,6 +316,10 @@ int LiveDeviceListClean(void)
     SCEnter();
     LiveDevice *pd, *tpd;
 
+    /* dpdk: need to close all devices before freeing them. */
+    TAILQ_FOREACH (pd, &live_devices, next) {
+        DPDKCloseDevice(pd);
+    }
     TAILQ_FOREACH_SAFE(pd, &live_devices, next, tpd) {
         if (live_devices_stats) {
             SCLogNotice("%s: packets: %" PRIu64 ", drops: %" PRIu64
@@ -328,7 +332,7 @@ int LiveDeviceListClean(void)
         }
 
         RestoreIfaceOffloading(pd);
-        DPDKCloseDevice(pd);
+        DPDKFreeDevice(pd);
 
         if (pd->dev)
             SCFree(pd->dev);

src/util-dpdk.c

@@ -40,18 +40,25 @@ void DPDKCloseDevice(LiveDevice *ldev)
 {
     (void)ldev; // avoid warnings of unused variable
 #ifdef HAVE_DPDK
-    uint16_t port_id;
-    int retval;
     if (run_mode == RUNMODE_DPDK) {
-        retval = rte_eth_dev_get_port_by_name(ldev->dev, &port_id);
+        uint16_t port_id;
+        int retval = rte_eth_dev_get_port_by_name(ldev->dev, &port_id);
         if (retval < 0) {
             SCLogError("%s: failed get port id, error: %s", ldev->dev, rte_strerror(-retval));
             return;
         }
 
         SCLogPerf("%s: closing device", ldev->dev);
         rte_eth_dev_close(port_id);
+    }
+#endif
+}
 
+void DPDKFreeDevice(LiveDevice *ldev)
+{
+    (void)ldev; // avoid warnings of unused variable
+#ifdef HAVE_DPDK
+    if (run_mode == RUNMODE_DPDK) {
         SCLogDebug("%s: releasing packet mempool", ldev->dev);
         rte_mempool_free(ldev->dpdk_vars.pkt_mp);
     }

src/util-dpdk.h

@@ -120,6 +120,7 @@
 void DPDKCleanupEAL(void);
 
 void DPDKCloseDevice(LiveDevice *ldev);
+void DPDKFreeDevice(LiveDevice *ldev);
 
 #ifdef HAVE_DPDK
 const char *DPDKGetPortNameByPortID(uint16_t pid);