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-rw-r--r--src/vnet/devices/tap/tap.c38
-rw-r--r--src/vnet/devices/tap/tap.h6
2 files changed, 18 insertions, 26 deletions
diff --git a/src/vnet/devices/tap/tap.c b/src/vnet/devices/tap/tap.c
index 7cffaafb1e2..2341bbbd140 100644
--- a/src/vnet/devices/tap/tap.c
+++ b/src/vnet/devices/tap/tap.c
@@ -76,6 +76,7 @@ open_netns_fd (char *netns)
return fd;
}
+#define TAP_MAX_INSTANCE 1024
void
tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args)
@@ -93,12 +94,10 @@ tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args)
struct vhost_memory *vhost_mem = 0;
virtio_if_t *vif = 0;
clib_error_t *err = 0;
- uword *p;
if (args->id != ~0)
{
- p = hash_get (tm->dev_instance_by_interface_id, args->id);
- if (p)
+ if (clib_bitmap_get (tm->tap_ids, args->id))
{
args->rv = VNET_API_ERROR_INVALID_INTERFACE;
args->error = clib_error_return (0, "interface already exists");
@@ -107,22 +106,14 @@ tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args)
}
else
{
- int tries = 1000;
- while (--tries)
- {
- args->id = tm->last_used_interface_id++;
- p = hash_get (tm->dev_instance_by_interface_id, args->id);
- if (!p)
- break;
- }
+ args->id = clib_bitmap_first_clear (tm->tap_ids);
+ }
- if (!tries)
- {
- args->rv = VNET_API_ERROR_UNSPECIFIED;
- args->error =
- clib_error_return (0, "cannot find free interface id");
- return;
- }
+ if (args->id > TAP_MAX_INSTANCE)
+ {
+ args->rv = VNET_API_ERROR_UNSPECIFIED;
+ args->error = clib_error_return (0, "cannot find free interface id");
+ return;
}
memset (&ifr, 0, sizeof (ifr));
@@ -382,8 +373,7 @@ tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args)
goto error;
}
- hash_set (tm->dev_instance_by_interface_id, vif->id, vif->dev_instance);
-
+ tm->tap_ids = clib_bitmap_set (tm->tap_ids, vif->id, 1);
sw = vnet_get_hw_sw_interface (vnm, vif->hw_if_index);
vif->sw_if_index = sw->sw_if_index;
args->sw_if_index = vif->sw_if_index;
@@ -415,6 +405,7 @@ error:
if (vif->fd != -1)
close (vif->fd);
vec_foreach_index (i, vif->vrings) virtio_vring_free (vm, vif, i);
+ vec_free (vif->vrings);
memset (vif, 0, sizeof (virtio_if_t));
pool_put (vim->interfaces, vif);
@@ -457,7 +448,7 @@ tap_delete_if (vlib_main_t * vm, u32 sw_if_index)
vec_foreach_index (i, vif->vrings) virtio_vring_free (vm, vif, i);
vec_free (vif->vrings);
- hash_unset (tm->dev_instance_by_interface_id, vif->id);
+ tm->tap_ids = clib_bitmap_set (tm->tap_ids, vif->id, 0);
clib_spinlock_free (&vif->lockp);
memset (vif, 0, sizeof (*vif));
pool_put (mm->interfaces, vif);
@@ -530,10 +521,11 @@ tap_init (vlib_main_t * vm)
error = vlib_call_init_function (vm, vlib_log_init);
if (error)
return error;
- tm->dev_instance_by_interface_id = hash_create (0, sizeof (uword));
+
tm->log_default = vlib_log_register_class ("tap", 0);
vlib_log_info (tm->log_default, "initialized");
- return 0;
+
+ return NULL;
}
VLIB_INIT_FUNCTION (tap_init);
diff --git a/src/vnet/devices/tap/tap.h b/src/vnet/devices/tap/tap.h
index 6e46302770d..7aebade59c7 100644
--- a/src/vnet/devices/tap/tap.h
+++ b/src/vnet/devices/tap/tap.h
@@ -67,11 +67,11 @@ typedef struct
typedef struct
{
- u32 last_used_interface_id;
- uword *dev_instance_by_interface_id;
-
/* logging */
vlib_log_class_t log_default;
+
+ /* bit-map of in-use IDs */
+ uword *tap_ids;
} tap_main_t;
void tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args);