tcp: Make all references to CUBIC uppercase

Consistently refer to the CUBIC congestion control
mechanism in uppercase throughout all comments.

No functional change.

Reviewed By: #transport, tuexen, mav, guest-ccui, emaste
Sponsored by: NetApp, Inc.
Differential Revision: https://reviews.freebsd.org/D36547

sys/netinet/cc/cc.h

@@ -112,7 +112,7 @@ struct cc_var {
 #define	CCF_IPHDR_CE		0x0010	/* Does this packet set CE bit? */
 #define	CCF_TCPHDR_CWR		0x0020	/* Does this packet set CWR bit? */
 #define	CCF_MAX_CWND		0x0040	/* Have we reached maximum cwnd? */
-#define	CCF_CHG_MAX_CWND	0x0080	/* Cubic max_cwnd changed, for K */
+#define	CCF_CHG_MAX_CWND	0x0080	/* CUBIC max_cwnd changed, for K */
 #define	CCF_USR_IWND		0x0100	/* User specified initial window */
 #define	CCF_USR_IWND_INIT_NSEG	0x0200	/* Convert segs to bytes on conn init */
 #define CCF_HYSTART_ALLOWED	0x0400	/* If the CC supports it Hystart is allowed */

sys/netinet/cc/cc_cubic.c

@@ -345,7 +345,7 @@ cubic_ack_received(struct cc_var *ccv, uint16_t type)
 }
 
 /*
- * This is a Cubic specific implementation of after_idle.
+ * This is a CUBIC specific implementation of after_idle.
  *   - Reset cwnd by calling New Reno implementation of after_idle.
  *   - Reset t_last_cong.
  */

sys/netinet/cc/cc_cubic.h

@@ -89,7 +89,7 @@
 /* Kernel only bits */
 #ifdef _KERNEL
 struct cubic {
-	/* Cubic K in fixed point form with CUBIC_SHIFT worth of precision. */
+	/* CUBIC K in fixed point form with CUBIC_SHIFT worth of precision. */
 	int64_t		K;
 	/* Sum of RTT samples across an epoch in ticks. */
 	int64_t		sum_rtt_ticks;