[Minios-devel] [UNIKRAFT PATCH 02/15] plat/tap: Bus interface for the tap device

[Sharan Santhanam <sharan.santhanam@xxxxxxxxx>]

The tap driver registers itself with the uk_bus. The uk_bus on
initialization provide the necessary interface to setup the driver.
The probe callback provides necessary interface to setup the tap device.

Signed-off-by: Sharan Santhanam <sharan.santhanam@xxxxxxxxx>
---
 plat/drivers/tap/tap.c | 38 ++++++++++++++++++++++++++++++++++++++
 plat/linuxu/Config.uk  |  1 +
 2 files changed, 39 insertions(+)

diff --git a/plat/drivers/tap/tap.c b/plat/drivers/tap/tap.c
index d233c6d..ffd21be 100644
--- a/plat/drivers/tap/tap.c
+++ b/plat/drivers/tap/tap.c
@@ -32,12 +32,16 @@
  * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
  */
 #include <errno.h>
+#include <stdio.h>
+#include <string.h>
 #include <uk/alloc.h>
 #include <uk/arch/types.h>
 #include <uk/netdev_core.h>
 #include <uk/netdev_driver.h>
 #include <uk/netbuf.h>
 #include <uk/errptr.h>
+#include <uk/bus.h>
+
 
 #define TAPDEV_MAX_CNT          7
 #define TAPDEV_IFNAME_BRS       255
@@ -54,6 +58,18 @@
 
 #define ETH_PKT_PAYLOAD_LEN       1500
 
+struct tap_net_drv {
+       struct uk_alloc *a;
+       UK_TAILQ_HEAD(tdev_list, struct tap_net_dev) tap_dev_list;
+       __u16 tap_dev_cnt;
+       char **bridge_ifs;
+};
+
+/**
+ * Module level variables
+ */
+static struct tap_net_drv tap_drv = {0};
+
 /**
  * Module functions
  */
@@ -230,3 +246,25 @@ static const struct uk_netdev_ops tap_netdev_ops = {
        .txq_info_get = tap_netdev_txq_info_get,
        .rxq_info_get = tap_netdev_rxq_info_get,
 };
+/**
+ * Register a tap driver as bus. Currently in Unikraft, the uk_bus interface
+ * provides the necessary to provide callbacks for bring a pseudo device. In 
the
+ * future we might provide interface to support the pseudo device.
+ */
+static int tap_drv_probe(void)
+{
+       return 0;
+}
+
+static int tap_drv_init(struct uk_alloc *_a)
+{
+       tap_drv.a = _a;
+       UK_TAILQ_INIT(&tap_drv.tap_dev_list);
+       return 0;
+}
+
+static struct uk_bus tap_bus = {
+       .init = tap_drv_init,
+       .probe = tap_drv_probe,
+};
+UK_BUS_REGISTER(&tap_bus);
diff --git a/plat/linuxu/Config.uk b/plat/linuxu/Config.uk
index 896e9ea..d85b6fd 100644
--- a/plat/linuxu/Config.uk
+++ b/plat/linuxu/Config.uk
@@ -22,6 +22,7 @@ if (PLAT_LINUXU)
        default y if LIBUKNETDEV
        default n
        depends on LIBUKNETDEV
+       select LIBUKBUS
        help
                Enable drivers to support tap device on the linuxu platform. The
                driver implements the uknetdev interface and provides an 
interface
-- 
2.7.4


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