[newlib-cygwin] tcp: LRO code to deal with all 12 TCP header flags

[newlib-cygwin] tcp: LRO code to deal with all 12 TCP header flags

[Sebastian Huber]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=aeced2f48a1f8ad0a6d4702f8060db88d8a44e44

commit aeced2f48a1f8ad0a6d4702f8060db88d8a44e44
Author: Richard Scheffenegger <rscheff@FreeBSD.org>
Date:   Tue Feb 1 17:25:49 2022 +0100

    tcp: LRO code to deal with all 12 TCP header flags
    
    TCP per RFC793 has 4 reserved flag bits for future use. One
    of those bits may be used for Accurate ECN.
    This patch is to include these bits in the LRO code to ease
    the extensibility if/when these bits are used.
    
    Reviewed By: hselasky, rrs, #transport
    Sponsored by:        NetApp, Inc.
    Differential Revision: https://reviews.freebsd.org/D34127

Diff:
---
 newlib/libc/sys/rtems/include/netinet/tcp.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/newlib/libc/sys/rtems/include/netinet/tcp.h b/newlib/libc/sys/rtems/include/netinet/tcp.h
index 6dc7403aa..6a3603287 100644
--- a/newlib/libc/sys/rtems/include/netinet/tcp.h
+++ b/newlib/libc/sys/rtems/include/netinet/tcp.h
@@ -55,12 +55,12 @@ struct tcphdr {
 	tcp_seq	th_seq;			/* sequence number */
 	tcp_seq	th_ack;			/* acknowledgement number */
 #if BYTE_ORDER == LITTLE_ENDIAN
-	u_char	th_x2:4,		/* (unused) */
+	u_char	th_x2:4,		/* upper 4 (reserved) flags */
 		th_off:4;		/* data offset */
 #endif
 #if BYTE_ORDER == BIG_ENDIAN
 	u_char	th_off:4,		/* data offset */
-		th_x2:4;		/* (unused) */
+		th_x2:4;		/* upper 4 (reserved) flags */
 #endif
 	u_char	th_flags;
 #define	TH_FIN	0x01