The branch main has been updated by allanjude:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=b84d0aaa4e64fb95b105d0d38f6295fec7a82110

commit b84d0aaa4e64fb95b105d0d38f6295fec7a82110
Author:     Allan Jude <allanj...@freebsd.org>
AuthorDate: 2021-01-19 23:22:07 +0000
Commit:     Allan Jude <allanj...@freebsd.org>
CommitDate: 2021-01-20 15:50:45 +0000

    ifconfig: add vlanproto "qiniq" as an alias for "802.1ad"
    
    QinQ is better known by this name, so accept it as an alias
    
    Reported-by:    Mike Geiger
    Reviewed-by:    melifaro, hselasky, rpokala
    MFC-with:       366917
    Sponsored-by:   Klara Inc.
    Differential-Revision:  https://reviews.freebsd.org/D28245
---
 sbin/ifconfig/ifconfig.8 | 5 +++++
 sbin/ifconfig/ifvlan.c   | 5 +++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/sbin/ifconfig/ifconfig.8 b/sbin/ifconfig/ifconfig.8
index c1ffb6a82ccc..bbaaa00d419b 100644
--- a/sbin/ifconfig/ifconfig.8
+++ b/sbin/ifconfig/ifconfig.8
@@ -2706,6 +2706,11 @@ and
 .Dq 802.1ad .
 The default encapsulation protocol is
 .Dq 802.1Q .
+The
+.Dq 802.1ad
+protocol is also commonly known as
+.Dq QinQ ;
+either name can be used.
 .It Cm vlanpcp Ar priority_code_point
 Priority code point
 .Pq Dv PCP
diff --git a/sbin/ifconfig/ifvlan.c b/sbin/ifconfig/ifvlan.c
index f316b0404459..60f97338ee27 100644
--- a/sbin/ifconfig/ifvlan.c
+++ b/sbin/ifconfig/ifvlan.c
@@ -68,6 +68,7 @@ static const char rcsid[] =
 
 static const char proto_8021Q[]  = "802.1q";
 static const char proto_8021ad[] = "802.1ad";
+static const char proto_qinq[] = "qinq";
 
 static         struct vlanreq params = {
        .vlr_tag        = NOTAG,
@@ -220,8 +221,8 @@ DECL_CMD_FUNC(setvlanproto, val, d)
        if (strncasecmp(proto_8021Q, val,
            strlen(proto_8021Q)) == 0) {
                params.vlr_proto = ETHERTYPE_VLAN;
-       } else if (strncasecmp(proto_8021ad, val,
-                  strlen(proto_8021ad)) == 0) {
+       } else if ((strncasecmp(proto_8021ad, val, strlen(proto_8021ad)) == 0)
+           || (strncasecmp(proto_qinq, val, strlen(proto_qinq)) == 0)) {
                params.vlr_proto = ETHERTYPE_QINQ;
        } else
                errx(1, "invalid value for vlanproto");
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