cxgbe(4): Add a minimal if_cxl module that pulls in the real driver as

a dependency.  This ensures "ifconfig cxl<n> ..." does the right thing
even when it's run with no driver loaded.

if_cxl.ko is the tiniest module in /boot/kernel.

MFC after:	2 weeks

3 files changed, 56 insertions, 0 deletions

diff --git a/sys/dev/cxgbe/if_cxl.c b/sys/dev/cxgbe/if_cxl.c
new file mode 100644
index 0000000..2b498dc
--- /dev/null
+++ b/sys/dev/cxgbe/if_cxl.c
@@ -0,0 +1,44 @@
+/*-
+ * Copyright (c) 2015 Chelsio Communications, Inc.
+ * All rights reserved.
+ * Written by: Navdeep Parhar <np@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+
+static int
+mod_event(module_t mod, int cmd, void *arg)
+{
+
+	return (0);
+}
+static moduledata_t if_cxl_mod = {"if_cxl", mod_event};
+DECLARE_MODULE(if_cxl, if_cxl_mod, SI_SUB_EXEC, SI_ORDER_ANY);
+MODULE_VERSION(if_cxl, 1);
+MODULE_DEPEND(if_cxl, cxl, 1, 1, 1);
diff --git a/sys/modules/cxgbe/Makefile b/sys/modules/cxgbe/Makefile
index f7862b5..a46850c 100644
--- a/sys/modules/cxgbe/Makefile
+++ b/sys/modules/cxgbe/Makefile
@@ -6,6 +6,7 @@ SYSDIR?=${.CURDIR}/../..
 .include "${SYSDIR}/conf/kern.opts.mk"
 
 SUBDIR=	if_cxgbe
+SUBDIR+=	if_cxl
 SUBDIR+=	t4_firmware
 SUBDIR+=	t5_firmware
 SUBDIR+=	${_tom}
diff --git a/sys/modules/cxgbe/if_cxl/Makefile b/sys/modules/cxgbe/if_cxl/Makefile
new file mode 100644
index 0000000..ec4ff1e
--- /dev/null
+++ b/sys/modules/cxgbe/if_cxl/Makefile
@@ -0,0 +1,11 @@
+#
+# $FreeBSD$
+#
+
+CXGBE=	${.CURDIR}/../../../dev/cxgbe
+.PATH: ${CXGBE}
+
+KMOD=	if_cxl
+SRCS=	if_cxl.c
+
+.include <bsd.kmod.mk>