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authorSainath Grandhi <sainath.grandhi@intel.com>2017-02-11 03:03:48 +0300
committerDavid S. Miller <davem@davemloft.net>2017-02-12 04:59:41 +0300
commitebc05ba7e8600b52a2a0c87a43105143368aca2a (patch)
treede9da1f26aa63eb1bea5b6f01b85fcd3fc26cade /drivers/net/tap.c
parent635b8c8ecdd27142d7fdab0df334b2e9201481cf (diff)
downloadlinux-ebc05ba7e8600b52a2a0c87a43105143368aca2a.tar.xz
tap: Tap character device creation/destroy API
This patch provides tap device create/destroy APIs in tap.c. Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/tap.c')
-rw-r--r--drivers/net/tap.c62
1 files changed, 51 insertions, 11 deletions
diff --git a/drivers/net/tap.c b/drivers/net/tap.c
index 15ca2d531d05..04ba9782c2f3 100644
--- a/drivers/net/tap.c
+++ b/drivers/net/tap.c
@@ -123,8 +123,12 @@ static struct proto tap_proto = {
};
#define TAP_NUM_DEVS (1U << MINORBITS)
-static DEFINE_MUTEX(minor_lock);
-DEFINE_IDR(minor_idr);
+struct major_info {
+ dev_t major;
+ struct idr minor_idr;
+ struct mutex minor_lock;
+ const char *device_name;
+} macvtap_major;
#define GOODCOPY_LEN 128
@@ -413,26 +417,26 @@ int tap_get_minor(struct macvlan_dev *vlan)
{
int retval = -ENOMEM;
- mutex_lock(&minor_lock);
- retval = idr_alloc(&minor_idr, vlan, 1, TAP_NUM_DEVS, GFP_KERNEL);
+ mutex_lock(&macvtap_major.minor_lock);
+ retval = idr_alloc(&macvtap_major.minor_idr, vlan, 1, TAP_NUM_DEVS, GFP_KERNEL);
if (retval >= 0) {
vlan->minor = retval;
} else if (retval == -ENOSPC) {
netdev_err(vlan->dev, "Too many tap devices\n");
retval = -EINVAL;
}
- mutex_unlock(&minor_lock);
+ mutex_unlock(&macvtap_major.minor_lock);
return retval < 0 ? retval : 0;
}
void tap_free_minor(struct macvlan_dev *vlan)
{
- mutex_lock(&minor_lock);
+ mutex_lock(&macvtap_major.minor_lock);
if (vlan->minor) {
- idr_remove(&minor_idr, vlan->minor);
+ idr_remove(&macvtap_major.minor_idr, vlan->minor);
vlan->minor = 0;
}
- mutex_unlock(&minor_lock);
+ mutex_unlock(&macvtap_major.minor_lock);
}
static struct net_device *dev_get_by_tap_minor(int minor)
@@ -440,13 +444,13 @@ static struct net_device *dev_get_by_tap_minor(int minor)
struct net_device *dev = NULL;
struct macvlan_dev *vlan;
- mutex_lock(&minor_lock);
- vlan = idr_find(&minor_idr, minor);
+ mutex_lock(&macvtap_major.minor_lock);
+ vlan = idr_find(&macvtap_major.minor_idr, minor);
if (vlan) {
dev = vlan->dev;
dev_hold(dev);
}
- mutex_unlock(&minor_lock);
+ mutex_unlock(&macvtap_major.minor_lock);
return dev;
}
@@ -1184,3 +1188,39 @@ int tap_queue_resize(struct macvlan_dev *vlan)
kfree(arrays);
return ret;
}
+
+int tap_create_cdev(struct cdev *tap_cdev,
+ dev_t *tap_major, const char *device_name)
+{
+ int err;
+
+ err = alloc_chrdev_region(tap_major, 0, TAP_NUM_DEVS, device_name);
+ if (err)
+ goto out1;
+
+ cdev_init(tap_cdev, &tap_fops);
+ err = cdev_add(tap_cdev, *tap_major, TAP_NUM_DEVS);
+ if (err)
+ goto out2;
+
+ macvtap_major.major = MAJOR(*tap_major);
+
+ idr_init(&macvtap_major.minor_idr);
+ mutex_init(&macvtap_major.minor_lock);
+
+ macvtap_major.device_name = device_name;
+
+ return 0;
+
+out2:
+ unregister_chrdev_region(*tap_major, TAP_NUM_DEVS);
+out1:
+ return err;
+}
+
+void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev)
+{
+ cdev_del(tap_cdev);
+ unregister_chrdev_region(major, TAP_NUM_DEVS);
+ idr_destroy(&macvtap_major.minor_idr);
+}