irmd: Allow direct rbuff between local processes

This allows bypassing the IPCP for local processes that share the same
packet pool, lowering latency between processes to comparable levels
as Unix sockets (RTT in the order of a microsecond).

For local processes, no IPCPs are needed:

 $ irm b prog oping n oping
 $ oping -l
 Ouroboros ping server started.
 New flow 64.
 Received 64 bytes on fd 64.

The direct IPC can be disabled with the DISABLE_DIRECT_IPC build
flag. Note that this is needed for rumba 'local' experiments to
emulate network topologies. Without this flag all processes will just
communicate directly.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

1 files changed, 13 insertions, 2 deletions

diff --git a/src/tools/oping/oping.c b/src/tools/oping/oping.c
index 86796552..763c0d62 100644
--- a/src/tools/oping/oping.c
+++ b/src/tools/oping/oping.c
@@ -72,17 +72,19 @@
 "and reports the Round Trip Time (RTT)\n"                                    \
 "\n"                                                                         \
 "  -l, --listen            Run in server mode\n"                             \
+"      --poll              Server uses polling (lower latency)\n"            \
+"      --busy              Server uses busy-poll (single flow)\n"            \
 "\n"                                                                         \
 "  -c, --count             Number of packets\n"                              \
 "  -d, --duration          Duration of the test (default 1s)\n"              \
 "  -f, --flood             Send back-to-back without waiting\n"              \
+"  -F, --flood-busy        Flood with busy-polling (lower latency)\n"        \
 "  -i, --interval          Interval (default 1000ms)\n"                      \
 "  -n, --server-name       Name of the oping server\n"                       \
-"  -q, --qos               QoS (raw, best, video, voice, data)\n" \
+"  -q, --qos               QoS (raw, best, video, voice, data)\n"            \
 "  -s, --size              Payload size (B, default 64)\n"                   \
 "  -Q, --quiet             Only print final statistics\n"                    \
 "  -D, --timeofday         Print time of day before each line\n"             \
-"      --poll              Server uses polling (lower latency)\n"            \
 "\n"                                                                         \
 "      --help              Display this help text and exit\n"                \
 
@@ -93,6 +95,7 @@ struct {
         int       size;
         bool      timestamp;
         bool      flood;
+        bool      flood_busy;
         qosspec_t qs;
 
         /* stats */
@@ -118,6 +121,7 @@ struct {
 
         bool quiet;
         bool poll;
+        bool busy;
 
         pthread_t cleaner_pt;
         pthread_t accept_pt;
@@ -177,10 +181,12 @@ int main(int     argc,
         client.count     = INT_MAX;
         client.timestamp = false;
         client.flood     = false;
+        client.flood_busy = false;
         client.qs        = qos_raw;
         client.quiet     = false;
         server.quiet     = false;
         server.poll      = false;
+        server.busy      = false;
 
         while (argc > 0) {
                 if ((strcmp(*argv, "-i") == 0 ||
@@ -221,6 +227,9 @@ int main(int     argc,
                 } else if (strcmp(*argv, "-f") == 0 ||
                            strcmp(*argv, "--flood") == 0) {
                         client.flood = true;
+                } else if (strcmp(*argv, "-F") == 0 ||
+                           strcmp(*argv, "--flood-busy") == 0) {
+                        client.flood_busy = true;
                 } else if (strcmp(*argv, "-D") == 0 ||
                            strcmp(*argv, "--timeofday") == 0) {
                         client.timestamp = true;
@@ -230,6 +239,8 @@ int main(int     argc,
                         server.quiet = true;
                 } else if (strcmp(*argv, "--poll") == 0) {
                         server.poll = true;
+                } else if (strcmp(*argv, "--busy") == 0) {
+                        server.busy = true;
                 } else {
                         goto fail;
                 }