udp_send: send data in MMS-sized chunks

This determines the Maximum Message Size for the UDPv4/v6 layer; using
the earlier functions. The outcome is used to set the FEC slice size,
initialisation of the UDP client has also been moved to the init_fec()
function.

diff --git a/udp_send.c b/udp_send.c
index 5c1cdf02c2fb9e1be95783f65cfeb12994a15056..a7d696efd93c88e3ef3aabd257943b5db6380945 100644 (file)
--- a/udp_send.c
+++ b/udp_send.c
@@ -11,6 +11,7 @@
 #include <sys/time.h>
 #include <dirent.h>
 #include <sys/socket.h>
+#include <netinet/udp.h>
 #include <net/if.h>
 #include <osl.h>
 
@@ -232,6 +233,19 @@ static int udp_com_delete(struct sender_command_data *scd)
        return 1;
 }
 
+/** Initialize UDP session and set maximum payload size. */
+static int udp_init_fec(struct sender_client *sc)
+{
+       int mps, ret = udp_init_session(sc);
+
+       if (ret < 0)
+               return ret;
+
+       mps = generic_max_transport_msg_size(sc->fd) - sizeof(struct udphdr);
+       PARA_INFO_LOG("current MPS = %d bytes\n", mps);
+       return mps;
+}
+
 static int udp_send_fec(struct sender_client *sc, char *buf, size_t len)
 {
        struct udp_target *ut = sc->private_data;
@@ -278,7 +292,7 @@ static void udp_add_target(struct sender_command_data *scd)
        ut->fcp.slices_per_group      = scd->slices_per_group;
        ut->fcp.data_slices_per_group = scd->data_slices_per_group;
        ut->fcp.max_slice_bytes       = scd->max_slice_bytes;
-       ut->fcp.init_fec              = NULL; /* FIXME */
+       ut->fcp.init_fec              = udp_init_fec;
        ut->fcp.send_fec              = udp_send_fec;
 
        ut->sc = para_calloc(sizeof(*ut->sc));