gbp: Ownership of dynamically created vxlan-gbp tunnels managed via gbp_itf

Type: fix

This solves the ownership of vxlan-gbp tunnels. When the last reference of these goes away they need to be deleted. Currently there are two owners; gbp_itf via gef_itf and the lock held by the gbp_endpoint_location_t. The problem is that the
loc removes its reference whilst the fwd still holds the gbp_itf, and things go wrong.
This change moves the lifecycle management of the vxlan-gbp tunnel to the gbp_itf. When the last lock of the gbp_itf goes, so does the tunnel. now both the EP's loc and fwd can hold a lock on the gbp_itf and it's only removed when required.
The other change is the management of the 'user' of the gbp_itf. Since each user can enable and disable different features, it's the job of the gbp_itf to apply the combined set. determining a unique 'uesr' from the caller was near impossible, so I moved that to the gbp_itf, and return the allocated user, hence the 'handle' that encodes both user and interface.

The hash table maps from sw_if_index to pool index.

Change-Id: I4c7bf4c0e5dcf33d1c545f262365e69151febcf4
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 61 insertions, 7 deletions

diff --git a/src/plugins/gbp/gbp_itf.h b/src/plugins/gbp/gbp_itf.h
index 6ece7b10c29..b0c7ed91865 100644
--- a/src/plugins/gbp/gbp_itf.h
+++ b/src/plugins/gbp/gbp_itf.h
@@ -19,17 +19,71 @@
 #include <vnet/l2/l2_input.h>
 #include <vnet/l2/l2_output.h>
 
-extern index_t gbp_itf_add_and_lock (u32 sw_if_index, u32 bd_index);
-extern void gbp_itf_unlock (index_t index);
 
-extern void gbp_itf_set_l2_input_feature (index_t gii,
-					  index_t useri,
+#define foreach_gdb_l3_feature                  \
+  _(LEARN_IP4, "gbp-learn-ip4", "ip4-unicast") \
+  _(LEARN_IP6, "gbp-learn-ip6", "ip6-unicast")
+
+typedef enum gbp_itf_l3_feat_pos_t_
+{
+#define _(s,v,a) GBP_ITF_L3_FEAT_POS_##s,
+  foreach_gdb_l3_feature
+#undef _
+} gbp_itf_l3_feat_pos_t;
+
+typedef enum gbp_itf_l3_feat_t_
+{
+  GBP_ITF_L3_FEAT_NONE,
+#define _(s,v,a) GBP_ITF_L3_FEAT_##s = (1 << GBP_ITF_L3_FEAT_POS_##s),
+  foreach_gdb_l3_feature
+#undef _
+} gbp_itf_l3_feat_t;
+
+#define GBP_ITF_L3_FEAT_LEARN (GBP_ITF_L3_FEAT_LEARN_IP4|GBP_ITF_L3_FEAT_LEARN_IP6)
+
+typedef struct gbp_itf_hdl_t_
+{
+  union
+  {
+    struct
+    {
+      u32 gh_who;
+      u32 gh_which;
+    };
+  };
+} gbp_itf_hdl_t;
+
+#define GBP_ITF_HDL_INIT {.gh_which = ~0}
+const static gbp_itf_hdl_t GBP_ITF_HDL_INVALID = GBP_ITF_HDL_INIT;
+
+extern void gbp_itf_hdl_reset (gbp_itf_hdl_t * gh);
+extern bool gbp_itf_hdl_is_valid (gbp_itf_hdl_t gh);
+
+typedef void (*gbp_itf_free_fn_t) (u32 sw_if_index);
+
+extern gbp_itf_hdl_t gbp_itf_l2_add_and_lock (u32 sw_if_index, u32 bd_index);
+extern gbp_itf_hdl_t gbp_itf_l3_add_and_lock (u32 sw_if_index, index_t gri);
+extern gbp_itf_hdl_t gbp_itf_l2_add_and_lock_w_free (u32 sw_if_index,
+						     u32 bd_index,
+						     gbp_itf_free_fn_t ff);
+extern gbp_itf_hdl_t gbp_itf_l3_add_and_lock_w_free (u32 sw_if_index,
+						     index_t gri,
+						     gbp_itf_free_fn_t ff);
+
+extern void gbp_itf_unlock (gbp_itf_hdl_t * hdl);
+extern void gbp_itf_lock (gbp_itf_hdl_t hdl);
+extern gbp_itf_hdl_t gbp_itf_clone_and_lock (gbp_itf_hdl_t hdl);
+extern u32 gbp_itf_get_sw_if_index (gbp_itf_hdl_t hdl);
+
+extern void gbp_itf_l2_set_input_feature (gbp_itf_hdl_t hdl,
 					  l2input_feat_masks_t feats);
-extern void gbp_itf_set_l2_output_feature (index_t gii,
-					   index_t useri,
+extern void gbp_itf_l2_set_output_feature (gbp_itf_hdl_t hdl,
 					   l2output_feat_masks_t feats);
 
-extern u8 *format_gbp_itf (u8 * s, va_list * args);
+extern void gbp_itf_l3_set_input_feature (gbp_itf_hdl_t hdl,
+					  gbp_itf_l3_feat_t feats);
+
+extern u8 *format_gbp_itf_hdl (u8 * s, va_list * args);
 
 #endif