Merge remote-tracking branch 'kiszka/queues/slirp' into staging

* kiszka/queues/slirp:
  slirp: Avoid redefining MAX_TCPOPTLEN
  slirp: Avoid statements without effect on Big Endian host
  slirp: Untangle TCPOLEN_* from TCPOPT_*

slirp/ip.h

@@ -34,18 +34,14 @@
 #define _IP_H_
 
 #ifdef HOST_WORDS_BIGENDIAN
-# ifndef NTOHL
-#  define NTOHL(d)
-# endif
-# ifndef NTOHS
-#  define NTOHS(d)
-# endif
-# ifndef HTONL
-#  define HTONL(d)
-# endif
-# ifndef HTONS
-#  define HTONS(d)
-# endif
+# undef NTOHL
+# undef NTOHS
+# undef HTONL
+# undef HTONS
+# define NTOHL(d)
+# define NTOHS(d)
+# define HTONL(d)
+# define HTONS(d)
 #else
 # ifndef NTOHL
 #  define NTOHL(d) ((d) = ntohl((d)))

slirp/tcp.h

@@ -79,20 +79,23 @@ struct tcphdr {
 #define	TCPOPT_EOL		0
 #define	TCPOPT_NOP		1
 #define	TCPOPT_MAXSEG		2
-#define    TCPOLEN_MAXSEG		4
 #define TCPOPT_WINDOW		3
-#define    TCPOLEN_WINDOW		3
 #define TCPOPT_SACK_PERMITTED	4		/* Experimental */
-#define    TCPOLEN_SACK_PERMITTED	2
 #define TCPOPT_SACK		5		/* Experimental */
 #define TCPOPT_TIMESTAMP	8
-#define    TCPOLEN_TIMESTAMP		10
-#define    TCPOLEN_TSTAMP_APPA		(TCPOLEN_TIMESTAMP+2) /* appendix A */
 
 #define TCPOPT_TSTAMP_HDR	\
     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
 #endif
 
+#ifndef TCPOLEN_MAXSEG
+#define    TCPOLEN_MAXSEG		4
+#define    TCPOLEN_WINDOW		3
+#define    TCPOLEN_SACK_PERMITTED	2
+#define    TCPOLEN_TIMESTAMP		10
+#define    TCPOLEN_TSTAMP_APPA		(TCPOLEN_TIMESTAMP+2) /* appendix A */
+#endif
+
 /*
  * Default maximum segment size for TCP.
  * With an IP MSS of 576, this is 536,

slirp/tcp_output.c

@@ -47,6 +47,7 @@ static const u_char  tcp_outflags[TCP_NSTATES] = {
 };
 
 
+#undef MAX_TCPOPTLEN
 #define MAX_TCPOPTLEN	32	/* max # bytes that go in options */
 
 /*