[src/trunk]: src/sys/net add a mask for valid capabilities

[pooka <pooka%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f10891ffb719
branches:  trunk
changeset: 794338:f10891ffb719
user:      pooka <pooka%NetBSD.org@localhost>
date:      Wed Mar 12 12:59:57 2014 +0000

description:
add a mask for valid capabilities

also add a comment stating why capabilities start from 0x80

diffstat:

 sys/net/if.h |  4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diffs (25 lines):

diff -r b20c73f7545f -r f10891ffb719 sys/net/if.h
--- a/sys/net/if.h      Wed Mar 12 12:54:33 2014 +0000
+++ b/sys/net/if.h      Wed Mar 12 12:59:57 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if.h,v 1.160 2014/01/25 21:10:29 christos Exp $        */
+/*     $NetBSD: if.h,v 1.161 2014/03/12 12:59:57 pooka Exp $   */
 
 /*-
  * Copyright (c) 1999, 2000, 2001 The NetBSD Foundation, Inc.
@@ -388,6 +388,7 @@
 #define        IF_Gbps(x)      (IF_Mbps((x) * 1000))   /* gigabits/sec. */
 
 /* Capabilities that interfaces can advertise. */
+                                       /* 0x01 .. 0x40 were previously used */
 #define        IFCAP_TSOv4             0x00080 /* can do TCPv4 segmentation offload */
 #define        IFCAP_CSUM_IPv4_Rx      0x00100 /* can do IPv4 header checksums (Rx) */
 #define        IFCAP_CSUM_IPv4_Tx      0x00200 /* can do IPv4 header checksums (Tx) */
@@ -400,6 +401,7 @@
 #define        IFCAP_CSUM_UDPv6_Rx     0x10000 /* can do IPv6/UDP checksums (Rx) */
 #define        IFCAP_CSUM_UDPv6_Tx     0x20000 /* can do IPv6/UDP checksums (Tx) */
 #define        IFCAP_TSOv6             0x40000 /* can do TCPv6 segmentation offload */
+#define        IFCAP_MASK              0x7ff80 /* currently valid capabilities */
 
 #define        IFCAPBITS               \
        "\020"                  \