oce(4): deprecate

The Emulex OneConnect NIC driver hasn't seen any commits other than ioctl
bug fixes (some severe) and sweeping commits since 2016.  There is no
indication of new parts since 2014 or earlier.  As such, deprecate the
driver with the aim of removing it prior to FreeBSD 15.

Reviewed by:	emaste
Differential Revision:	https://reviews.freebsd.org/D40531

share/man/man4/oce.4

@@ -36,7 +36,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd February 19, 2012
+.Dd June 13, 2023
 .Dt OCE 4
 .Os
 .Sh NAME
@@ -57,6 +57,12 @@ module at boot time, place the following line in
 .Bd -literal -offset indent
 if_oce_load="YES"
 .Ed
+.Sh DEPRECATION NOTICE
+The
+.Nm
+driver may not be present in
+.Fx 15.0
+and later.
 .Sh DESCRIPTION
 Emulex OneConnect adapters come in various skews and with
 different combinations of NIC, FCoE and iSCSI functions.

sys/dev/oce/oce_if.c

@@ -374,6 +374,8 @@ oce_attach(device_t dev)
 	}
 	softc_tail = sc;
 
+	gone_in_dev(dev, 15, "relatively uncommon 10GbE NIC");
+
 	return 0;
 
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