[ovs-dev] [RFC v3 1/4] netdev: Allow storing dpif type into netdev structure.

[Ilya Maximets]

Storing of the dpif type of the owning datapath interface will allow
us to easily distinguish, for example, userspace tunneling ports from
the system ones.  This is required in terms of HW offloading to avoid
offloading of userspace flows to kernel interfaces that doesn't belong
to userspace datapath, but have same dpif_port names.

Signed-off-by: Ilya Maximets <i.maximets at ovn.org>
---
 lib/netdev-provider.h |  3 ++-
 lib/netdev.c          | 16 ++++++++++++++++
 lib/netdev.h          |  2 ++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/lib/netdev-provider.h b/lib/netdev-provider.h
index f109c4e66..0037110de 100644
--- a/lib/netdev-provider.h
+++ b/lib/netdev-provider.h
@@ -85,7 +85,8 @@ struct netdev {
 
     /* Functions to control flow offloading. */
     OVSRCU_TYPE(const struct netdev_flow_api *) flow_api;
-    struct netdev_hw_info hw_info;	/* offload-capable netdev info */
+    const char *dpif_type;          /* Type of dpif this netdev belongs to. */
+    struct netdev_hw_info hw_info;  /* Offload-capable netdev info. */
 };
 
 static inline void
diff --git a/lib/netdev.c b/lib/netdev.c
index 405c98c68..bbc6346ed 100644
--- a/lib/netdev.c
+++ b/lib/netdev.c
@@ -1893,6 +1893,22 @@ netdev_get_class(const struct netdev *netdev)
     return netdev->netdev_class;
 }
 
+/* Set the type of 'dpif' this 'netdev' belongs to. */
+void
+netdev_set_dpif_type(struct netdev *netdev, const char *type)
+{
+    netdev->dpif_type = type;
+}
+
+/* Returns the type of 'dpif' this 'netdev' belongs to.
+ *
+ * The caller must not free the returned value. */
+const char *
+netdev_get_dpif_type(const struct netdev *netdev)
+{
+    return netdev->dpif_type;
+}
+
 /* Returns the netdev with 'name' or NULL if there is none.
  *
  * The caller must free the returned netdev with netdev_close(). */
diff --git a/lib/netdev.h b/lib/netdev.h
index fdbe0e1f5..fb5073056 100644
--- a/lib/netdev.h
+++ b/lib/netdev.h
@@ -179,6 +179,8 @@ bool netdev_mtu_is_user_config(struct netdev *);
 int netdev_get_ifindex(const struct netdev *);
 int netdev_set_tx_multiq(struct netdev *, unsigned int n_txq);
 enum netdev_pt_mode netdev_get_pt_mode(const struct netdev *);
+void netdev_set_dpif_type(struct netdev *, const char *);
+const char *netdev_get_dpif_type(const struct netdev *);
 
 /* Packet reception. */
 int netdev_rxq_open(struct netdev *, struct netdev_rxq **, int id);
-- 
2.17.1