[PATCH v2] dumpcap: add the mutiprocess fileprefix support.

[Arshdeep Kaur]

New optional parameter "-m <fileprefix>" added.
It will update the mp_socket path for multiprocess communication.
Default : '/var/run/dpdk/rte/mp_socket'
Updated : '/var/run/dpdk/<file-prefix>/mp_socket'

Note: Give -m as first argument.

Signed-off-by: Arshdeep Kaur <arshdeep.k...@intel.com>
---
 app/dumpcap/main.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/app/dumpcap/main.c b/app/dumpcap/main.c
index 8972c45a71..1aa43ad9c1 100644
--- a/app/dumpcap/main.c
+++ b/app/dumpcap/main.c
@@ -323,7 +323,7 @@ static void parse_opts(int argc, char **argv)
        int option_index, c;
 
        for (;;) {
-               c = getopt_long(argc, argv, "a:b:c:dDf:ghi:nN:pPqs:vw:",
+               c = getopt_long(argc, argv, "a:b:c:dDf:ghi:nN:m:pPqs:vw:",
                                long_options, &option_index);
                if (c == -1)
                        break;
@@ -392,6 +392,9 @@ static void parse_opts(int argc, char **argv)
                case 'v':
                        printf("%s\n", version());
                        exit(0);
+               case 'm':
+                       /* Handled before dpdk_init */
+                       break;
                default:
                        fprintf(stderr, "Invalid option: %s\n",
                                argv[optind - 1]);
@@ -507,10 +510,10 @@ report_packet_stats(dumpcap_out_t out)
  * typical EAL command line arguments.
  * We don't want to expose all the DPDK internals to the user.
  */
-static void dpdk_init(void)
+static void dpdk_init(const char * const prefix)
 {
-       static const char * const args[] = {
-               "dumpcap", "--proc-type", "secondary",
+               const char * const args[] = {
+               "dumpcap", "--proc-type", "secondary", "--file-prefix", prefix,
                "--log-level", "notice"
 
        };
@@ -787,7 +790,17 @@ int main(int argc, char **argv)
        progname = argv[0];
 
        parse_opts(argc, argv);
-       dpdk_init();
+       char prefix[256];
+       strcpy(prefix, "rte");
+
+       printf("\nIMP:: Please provide -m file_prefix as first argument in case 
non-default mp_socket path is to be setup (e.g. ./dpdk-dumpcap -m wls_0)\n\n");
+       /* In order to use mp_socket path other than default, give -m as first 
argument. */
+       if (argc >= 3) {
+               if (strncmp(argv[1], "-m", 2) == 0)
+                       strncpy(prefix, argv[2], sizeof(prefix));
+       }
+
+       dpdk_init(prefix);
 
        if (filter_str)
                compile_filter();
-- 
2.37.1