[UNIKRAFT PATCH v5 02/10] plat/xen/drivers: Add skeleton for netfront driver

[Costin Lupu <costin.lupu@xxxxxxxxx>]

This patch introduces the skeleton for the Xen netfront driver.

Signed-off-by: Costin Lupu <costin.lupu@xxxxxxxxx>
Signed-off-by: Razvan Cojocaru <razvan.cojocaru93@xxxxxxxxx>
---
 plat/xen/Config.uk                 |  8 ++++
 plat/xen/Makefile.uk               | 10 ++++
 plat/xen/drivers/net/exportsyms.uk |  1 +
 plat/xen/drivers/net/netfront.c    | 73 ++++++++++++++++++++++++++++++
 4 files changed, 92 insertions(+)
 create mode 100644 plat/xen/drivers/net/exportsyms.uk
 create mode 100644 plat/xen/drivers/net/netfront.c

diff --git a/plat/xen/Config.uk b/plat/xen/Config.uk
index 364c9528..3e542be1 100644
--- a/plat/xen/Config.uk
+++ b/plat/xen/Config.uk
@@ -90,6 +90,14 @@ config XEN_XENBUS
 menu "Xenbus Drivers"
        depends on XEN_XENBUS
 
+config XEN_NETFRONT
+       bool "Xenbus Netfront Driver"
+       default y if LIBUKNETDEV
+       default n
+       depends on LIBUKNETDEV
+       help
+               Driver for netfront devices
+
 menuconfig XEN_BLKFRONT
        bool "Xenbus Blkfront Driver"
        default n
diff --git a/plat/xen/Makefile.uk b/plat/xen/Makefile.uk
index 2a8cdbf6..339b1b21 100644
--- a/plat/xen/Makefile.uk
+++ b/plat/xen/Makefile.uk
@@ -10,6 +10,7 @@ $(eval $(call addplat_s,xen,$(CONFIG_PLAT_XEN)))
 ##
 $(eval $(call addplatlib,xen,libxenplat))
 $(eval $(call addplatlib_s,xen,libxenbus,$(CONFIG_XEN_XENBUS)))
+$(eval $(call addplatlib_s,xen,libxennetfront,$(CONFIG_XEN_NETFRONT)))
 $(eval $(call addplatlib_s,xen,libxenblkfront,$(CONFIG_XEN_BLKFRONT)))
 $(eval $(call addplatlib_s,xen,libxen9pfront,$(CONFIG_XEN_9PFRONT)))
 
@@ -113,6 +114,15 @@ LIBXENBUS_SRCS-y               += 
$(LIBXENPLAT_BASE)/xenbus/xs_watch.c
 LIBXENBUS_SRCS-y               += $(LIBXENPLAT_BASE)/xenbus/xs.c
 endif
 
+ifeq ($(CONFIG_XEN_NETFRONT),y)
+LIBXENNETFRONT_EXPORTS          = $(LIBXENPLAT_BASE)/drivers/net/exportsyms.uk
+LIBXENNETFRONT_ASFLAGS-y       += $(LIBXENPLAT_ASFLAGS-y)
+LIBXENNETFRONT_ASINCLUDES-y    += $(LIBXENPLAT_ASINCLUDES-y)
+LIBXENNETFRONT_CFLAGS-y        += $(LIBXENPLAT_CFLAGS-y)
+LIBXENNETFRONT_CINCLUDES-y     += $(LIBXENPLAT_CINCLUDES-y)
+LIBXENNETFRONT_SRCS-y          += $(LIBXENPLAT_BASE)/drivers/net/netfront.c
+endif
+
 ifeq ($(CONFIG_XEN_BLKFRONT),y)
 LIBXENBLKFRONT_EXPORTS           = $(LIBXENPLAT_BASE)/drivers/blk/exportsyms.uk
 LIBXENBLKFRONT_ASFLAGS-y        += $(LIBXENPLAT_ASFLAGS-y)
diff --git a/plat/xen/drivers/net/exportsyms.uk 
b/plat/xen/drivers/net/exportsyms.uk
new file mode 100644
index 00000000..c86c3f35
--- /dev/null
+++ b/plat/xen/drivers/net/exportsyms.uk
@@ -0,0 +1 @@
+none
\ No newline at end of file
diff --git a/plat/xen/drivers/net/netfront.c b/plat/xen/drivers/net/netfront.c
new file mode 100644
index 00000000..b455911e
--- /dev/null
+++ b/plat/xen/drivers/net/netfront.c
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Costin Lupu <costin.lupu@xxxxxxxxx>
+ *          Razvan Cojocaru <razvan.cojocaru93@xxxxxxxxx>
+ *
+ * Copyright (c) 2020, University Politehnica of Bucharest. All rights 
reserved.
+ *
+ * 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.
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#include <xenbus/xenbus.h>
+
+
+#define DRIVER_NAME  "xen-netfront"
+
+static struct uk_alloc *drv_allocator;
+
+
+static int netfront_add_dev(struct xenbus_device *xendev)
+{
+       int rc = 0;
+
+       UK_ASSERT(xendev != NULL);
+
+       return rc;
+}
+
+static int netfront_drv_init(struct uk_alloc *allocator)
+{
+       /* driver initialization */
+       if (!allocator)
+               return -EINVAL;
+
+       drv_allocator = allocator;
+       return 0;
+}
+
+static const xenbus_dev_type_t netfront_devtypes[] = {
+       xenbus_dev_vif,
+       xenbus_dev_none
+};
+
+static struct xenbus_driver netfront_driver = {
+       .device_types = netfront_devtypes,
+       .init         = netfront_drv_init,
+       .add_dev      = netfront_add_dev
+};
+XENBUS_REGISTER_DRIVER(&netfront_driver);
-- 
2.20.1