Add comments to knet_link and re-arrange

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>

libknet/internals.h

@@ -36,21 +36,25 @@ struct knet_listener {
 
 
 struct knet_link {
-	uint8_t link_id;
-	int listener_sock;
+	/* required */
 	struct sockaddr_storage src_addr;
 	struct sockaddr_storage dst_addr;
-	unsigned int remoteconnected:1; /* link is enabled for data (peer view) */
-	unsigned int donnotremoteupdate:1;    /* define source of the update */
+	/* configurable */
 	unsigned int dynamic; /* see KNET_LINK_DYN_ define above */
 	uint8_t  priority; /* higher priority == preferred for A/P */
+	unsigned long long ping_interval; /* interval */
+	unsigned long long pong_timeout; /* timeout */
+	unsigned int latency_fix; /* precision */
+	/* status */
+	struct knet_link_status status;
+	/* internals */
+	uint8_t link_id;
+	int listener_sock;
+	unsigned int remoteconnected:1; /* link is enabled for data (peer view) */
+	unsigned int donnotremoteupdate:1;    /* define source of the update */
 	unsigned int host_info_up_sent:1; /* 0 if we need to notify remote that link is up */
 	unsigned int latency_exp;
-	unsigned int latency_fix;
-	unsigned long long ping_interval;
-	unsigned long long pong_timeout;
 	struct timespec ping_last;
-	struct knet_link_status status;
 };
 
 #define KNET_CBUFFER_SIZE 4096