test/kni: check module dependency

Check the prerequisites to run the test
1.checked whether the rte_kni module is loaded, if not fail testcase
2.checked whether the rte_kni module is loaded with loop back mode,
  if not skip packet forwarding testcase and log
3.Disabled the test in freebsd as test is not supported

Fixes: 5233e5924a ("app/test: update kni")
Cc: stable@dpdk.org
Signed-off-by: Naga Suresh Somarowthu <naga.sureshx.somarowthu@intel.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/test/test/test_kni.c b/test/test/test_kni.c
index e382069..f3c19b5 100644 (file)
--- a/test/test/test_kni.c
+++ b/test/test/test_kni.c
@@ -7,10 +7,11 @@
 #include <unistd.h>
 #include <string.h>
 #include <sys/wait.h>
+#include <dirent.h>
 
 #include "test.h"
 
-#ifndef RTE_LIBRTE_KNI
+#if !defined(RTE_EXEC_ENV_LINUXAPP) || !defined(RTE_LIBRTE_KNI)
 
 static int
 test_kni(void)
@@ -40,6 +41,8 @@ test_kni(void)
 
 #define IFCONFIG      "/sbin/ifconfig "
 #define TEST_KNI_PORT "test_kni_port"
+#define KNI_MODULE_PATH "/sys/module/rte_kni"
+#define KNI_MODULE_PARAM_LO KNI_MODULE_PATH"/parameters/lo_mode"
 #define KNI_TEST_MAX_PORTS 4
 /* The threshold number of mbufs to be transmitted or received. */
 #define KNI_NUM_MBUF_THRESHOLD 100
@@ -530,7 +533,7 @@ static int
 test_kni(void)
 {
        int ret = -1;
-       uint16_t nb_ports, port_id;
+       uint16_t port_id;
        struct rte_kni *kni;
        struct rte_mempool *mp;
        struct rte_kni_conf conf;
@@ -538,6 +541,20 @@ test_kni(void)
        struct rte_kni_ops ops;
        const struct rte_pci_device *pci_dev;
        const struct rte_bus *bus;
+       FILE *fd;
+       DIR *dir;
+       char buf[16];
+
+       dir = opendir(KNI_MODULE_PATH);
+       if (!dir) {
+               if (errno == ENOENT) {
+                       printf("Cannot run UT due to missing rte_kni module\n");
+                       return -1;
+               }
+               printf("opendir: %s", strerror(errno));
+               return -1;
+       }
+       closedir(dir);
 
        /* Initialize KNI subsytem */
        rte_kni_init(KNI_TEST_MAX_PORTS);
@@ -553,12 +570,6 @@ test_kni(void)
                return -1;
        }
 
-       nb_ports = rte_eth_dev_count_avail();
-       if (nb_ports == 0) {
-               printf("no supported nic port found\n");
-               return -1;
-       }
-
        /* configuring port 0 for the test is enough */
        port_id = 0;
        ret = rte_eth_dev_configure(port_id, 1, 1, &port_conf);
@@ -587,9 +598,25 @@ test_kni(void)
        rte_eth_promiscuous_enable(port_id);
 
        /* basic test of kni processing */
-       ret = test_kni_processing(port_id, mp);
-       if (ret < 0)
-               goto fail;
+       fd = fopen(KNI_MODULE_PARAM_LO, "r");
+       if (fd == NULL) {
+               printf("fopen: %s", strerror(errno));
+               return -1;
+       }
+       memset(&buf, 0, sizeof(buf));
+       if (fgets(buf, sizeof(buf), fd)) {
+               if (!strncmp(buf, "lo_mode_fifo", strlen("lo_mode_fifo")) ||
+                       !strncmp(buf, "lo_mode_fifo_skb",
+                                 strlen("lo_mode_fifo_skb"))) {
+                       ret = test_kni_processing(port_id, mp);
+                       if (ret < 0) {
+                               fclose(fd);
+                               goto fail;
+                       }
+               } else
+                       printf("test_kni_processing skipped because of missing rte_kni module lo_mode argument\n");
+       }
+       fclose(fd);
 
        /* test of allocating KNI with NULL mempool pointer */
        memset(&info, 0, sizeof(info));