[v2,sockperf] sockperf: add SO_LL socketop support

Add lls socket option support.
use --lls (value in usecs) to override global setting.
Right now we always get and print the value of the option before we set,
to show that the option works properly.
This should be removed in an official release.
---

  src/Defs.h       |    3 +++
  src/SockPerf.cpp |   58 
+++++++++++++++++++++++++++++++++++++++++++++++++++---
  2 files changed, 58 insertions(+), 3 deletions(-)

defined by default)."
      },
@@ -292,7 +296,7 @@ static int proc_mode_help( int id, int argc, const 
char **argv )
      int   i = 0;

      printf(MODULE_NAME " is a tool for testing network latency and 
throughput.\n");
-    printf("version %s\n", STR(VERSION));
+    printf("version %s-lls\n", STR(VERSION));
      printf("\n");
      printf("Usage: " MODULE_NAME " <subcommand> [options] [args]\n");
      printf("Type: \'" MODULE_NAME " <subcommand> --help\' for help on 
a specific subcommand.\n");
@@ -1382,8 +1386,8 @@ static int proc_mode_server( int id, int argc, 
const char **argv )
          {
              'B', AOPT_NOARG,    aopt_set_literal( 'B' ), 
aopt_set_string( "Bridge" ),
              "Run in Bridge mode."
-        },
-*/
+        },
+*/
          {
               OPT_THREADS_NUM, AOPT_ARG, aopt_set_literal( 0 ), 
aopt_set_string( "threads-num" ),
               "Run <N> threads on server side (requires '-f' option)."
@@ -1789,6 +1793,26 @@ static int parse_common_opt( const AOPT_OBJECT 
*common_obj )
              s_user_params.is_nonblocked_send = true;
          }

+        if ( !rc && aopt_check(common_obj, OPT_LLS) ) {
+            const char* optarg = aopt_value(common_obj, OPT_LLS);
+            if (optarg) {
+                errno = 0;
+                int value = strtoul(optarg, NULL, 0);
+                if (errno != 0 || value < 0) {
+                    log_msg("'-%d' Invalid LLS value: %s", OPT_LLS, 
optarg);
+                    rc = SOCKPERF_ERR_BAD_ARGUMENT;
+                }
+                else {
+                    s_user_params.lls_usecs = value;
+                    s_user_params.lls_is_set = true;
+                }
+            }
+            else {
+                log_msg("'-%d' Invalid value", OPT_LLS);
+                rc = SOCKPERF_ERR_BAD_ARGUMENT;
+            }
+        }
+
          if ( !rc && aopt_check(common_obj, OPT_RECV_LOOPING) ) {

              const char* optarg = aopt_value(common_obj, OPT_RECV_LOOPING);
@@ -2296,6 +2320,29 @@ int sock_set_reuseaddr(int fd)
      return rc;
  }

+#ifndef SO_LL
+#define SO_LL 46
+#endif
+int sock_set_lls(int fd)
+{
+    int rc = SOCKPERF_ERR_NONE;
+    unsigned int lls;
+    int size = sizeof(lls);
+
+    if(getsockopt(fd, SOL_SOCKET, SO_LL, &lls, (socklen_t *)&size) < 0){
+        log_err("getsockopt(SO_LL) failed");
+        return SOCKPERF_ERR_SOCKET;
+    } else
+        log_msg("socket option SO_LL default was %u, changing to %u", 
lls, s_user_params.lls_usecs);
+
+    if (setsockopt(fd, SOL_SOCKET, SO_LL, &(s_user_params.lls_usecs), 
sizeof(s_user_params.lls_usecs)) < 0) {
+        log_err("setsockopt(SO_LL) failed");
+        rc = SOCKPERF_ERR_SOCKET;
+    }
+    return rc;
+}
+
+
  int sock_set_snd_rcv_bufs(int fd)
  {
      /*
@@ -2460,6 +2507,11 @@ int prepare_socket(int fd, struct fds_data *p_data)
      }

      if (!rc &&
+            (s_user_params.lls_is_set == true))
+    {
+        rc = sock_set_lls(fd);
+    }
+    if (!rc &&
              (s_user_params.sock_buff_size > 0))
      {
          rc = sock_set_snd_rcv_bufs(fd);





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