tools: Increase read buffer in ocbr server

The ocbr server had a 1500 byte read buffer, which caused it to
perform partial reads on larger SDUs, slowing it down considerably
when sendin large packets. The buffer has been increased to 512KB,
partial reads disabled, and the client will give an error when larger
frames are sent. It will also warn if the size overflows (avoiding a
SEGV).

Signed-off-by: Dimitri Staessens <dimitri.staessens@ugent.be>
Signed-off-by: Sander Vrijders <sander.vrijders@ugent.be>

3 files changed, 16 insertions, 5 deletions

diff --git a/src/tools/ocbr/ocbr.c b/src/tools/ocbr/ocbr.c
index 2c22cc3c..e2bd84af 100644
--- a/src/tools/ocbr/ocbr.c
+++ b/src/tools/ocbr/ocbr.c
@@ -46,7 +46,7 @@
 #include <time.h>
 #include <stdbool.h>
 
-#define BUF_SIZE 1500
+#define BUF_SIZE 524288L
 
 #include "ocbr_client.c"
 
@@ -71,11 +71,12 @@ static void usage(void)
                "  -n, --server_apn          Specify the name of the server.\n"
                "  -d, --duration            Duration for sending (s)\n"
                "  -f, --flood               Send SDUs as fast as possible\n"
-               "  -s, --size                SDU size (B)\n"
+               "  -s, --size                SDU size (B, max %ld B)\n"
                "  -r, --rate                Rate (b/s)\n"
                "      --sleep               Sleep in between sending SDUs\n"
                "\n\n"
-               "      --help                Display this help text and exit\n");
+               "      --help                Display this help text and exit\n",
+               BUF_SIZE);
 }
 
 int main(int argc, char ** argv)
@@ -152,6 +153,16 @@ int main(int argc, char ** argv)
                         return 0;
                 }
 
+                if (size > BUF_SIZE) {
+                        printf("Maximum size: %ld.\n", BUF_SIZE);
+                        return 0;
+                }
+
+                if (size < 0) {
+                        printf("Size overflow.\n");
+                        return 0;
+                }
+
                 ret = client_main(s_apn, duration, size, rate, flood, sleep);
         }
 
diff --git a/src/tools/ocbr/ocbr_client.c b/src/tools/ocbr/ocbr_client.c
index bf527317..026ab001 100644
--- a/src/tools/ocbr/ocbr_client.c
+++ b/src/tools/ocbr/ocbr_client.c
@@ -79,7 +79,7 @@ int client_main(char * server,
         struct sigaction sig_act;
 
         int fd = 0;
-        char buf[size];
+        char buf[BUF_SIZE];
         long seqnr = 0;
         long gap = size * 8.0 * (BILLION / (double) rate);
 
diff --git a/src/tools/ocbr/ocbr_server.c b/src/tools/ocbr/ocbr_server.c
index 3004d77c..4f080eff 100644
--- a/src/tools/ocbr/ocbr_server.c
+++ b/src/tools/ocbr/ocbr_server.c
@@ -100,7 +100,7 @@ static void handle_flow(int fd)
         alive = iv_start;
         ts_add(&iv_start, &intv, &iv_end);
 
-        fccntl(fd, FLOWSFLAGS, FLOWFRNOBLOCK | FLOWFRDWR);
+        fccntl(fd, FLOWSFLAGS, FLOWFRNOBLOCK | FLOWFRDWR | FLOWFRNOPART);
 
         while (!stop) {
                 clock_gettime(CLOCK_REALTIME, &now);