[PATCH] sockperf: add SO_LL socketop support

[Eliezer Tamir]

Add lls socket option support to sockperf.
Right now we always get the option before set to show the option is 
working properly. We should probably remove that in an official release.
use --lls (value in usecs) to override global setting.
---

 src/Defs.h       |    3 +++
 src/SockPerf.cpp |   54 
+++++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 56 insertions(+), 1 deletions(-)

diff --git a/src/Defs.h b/src/Defs.h
index e38e3a4..87b45a0 100644
--- a/src/Defs.h
+++ b/src/Defs.h
@@ -161,6 +161,7 @@ enum {
     OPT_OUTPUT_PRECISION,           //35
     OPT_CLIENTPORT,                 //36
     OPT_CLIENTIP,                   //37
+    OPT_LLS,            //38
 };

 #define MODULE_NAME            "sockperf"
@@ -527,6 +528,8 @@ struct user_params_t {
 //    bool stream_mode; - use b_stream instead
     int mthread_server;
     struct timeval* select_timeout;
+    unsigned long lls_usecs;
+    bool lls_is_set;
     int sock_buff_size;
     int threads_num;
     char threads_affinity[MAX_ARGV_SIZE];
diff --git a/src/SockPerf.cpp b/src/SockPerf.cpp
index 41daf95..d76320f 100644
--- a/src/SockPerf.cpp
+++ b/src/SockPerf.cpp
@@ -207,6 +207,10 @@ static const AOPT_DESC  common_opt_desc[] =
         "Limit the lifetime of the message (default 2)."
     },
     {
+        OPT_LLS, AOPT_ARG, aopt_set_literal( 0 ), aopt_set_string( "lls" ),
+        "Turn on LLS via socket option (value = us to poll)."
+    },
+    {
         OPT_BUFFER_SIZE, AOPT_ARG, aopt_set_literal( 0 ), 
aopt_set_string( "buffer-size" ),
         "Set total socket receive/send buffer <size> in bytes (system 
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");
@@ -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 long 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 %lu, changing to %lu", 
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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