sfc: neighbour lookup for TC encap action offload

For each neighbour we're interested in, create a struct efx_neigh_binder
 object which has a list of all the encap_actions using it.  When we
 receive a neighbouring update (through the netevent notifier), find the
 corresponding efx_neigh_binder and update all its users.
Since the actual generation of encap headers is still only a stub, the
 resulting rules still get left on fallback actions.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/drivers/net/ethernet/sfc/tc_encap_actions.h b/drivers/net/ethernet/sfc/tc_encap_actions.h
index 1a3679e81f09..4d755fb92daf 100644
--- a/drivers/net/ethernet/sfc/tc_encap_actions.h
+++ b/drivers/net/ethernet/sfc/tc_encap_actions.h
@@ -15,6 +15,54 @@
 #include <linux/refcount.h>
 #include <net/tc_act/tc_tunnel_key.h>
 
+/**
+ * struct efx_neigh_binder - driver state for a neighbour entry
+ * @net: the network namespace in which this neigh resides
+ * @dst_ip: the IPv4 destination address resolved by this neigh
+ * @dst_ip6: the IPv6 destination address resolved by this neigh
+ * @ha: the hardware (Ethernet) address of the neighbour
+ * @n_valid: true if the neighbour is in NUD_VALID state
+ * @lock: protects @ha and @n_valid
+ * @ttl: Time To Live associated with the route used
+ * @dying: set when egdev is going away, to skip further updates
+ * @egdev: egress device from the route lookup.  Holds a reference
+ * @dev_tracker: reference tracker entry for @egdev
+ * @ns_tracker: reference tracker entry for @ns
+ * @ref: counts encap actions referencing this entry
+ * @used: jiffies of last time traffic hit any encap action using this.
+ *      When counter reads update this, a new neighbour event is sent to
+ *      indicate that the neighbour entry is still in use.
+ * @users: list of &struct efx_tc_encap_action
+ * @linkage: entry in efx->neigh_ht (keys are @net, @dst_ip, @dst_ip6).
+ * @work: processes neighbour state changes, updates the encap actions
+ * @efx: owning NIC instance.
+ *
+ * Associates a neighbour entry with the encap actions that are
+ * interested in it, allowing the latter to be updated when the
+ * neighbour details change.
+ * Whichever of @dst_ip and @dst_ip6 is not in use will be all-zeroes,
+ * this distinguishes IPv4 from IPv6 entries.
+ */
+struct efx_neigh_binder {
+	struct net *net;
+	__be32 dst_ip;
+	struct in6_addr dst_ip6;
+	char ha[ETH_ALEN];
+	bool n_valid;
+	rwlock_t lock;
+	u8 ttl;
+	bool dying;
+	struct net_device *egdev;
+	netdevice_tracker dev_tracker;
+	netns_tracker ns_tracker;
+	refcount_t ref;
+	unsigned long used;
+	struct list_head users;
+	struct rhash_head linkage;
+	struct work_struct work;
+	struct efx_nic *efx;
+};
+
 /* This limit is arbitrary; current hardware (SN1022) handles encap headers
  * of up to 126 bytes, but that limit is not enshrined in the MCDI protocol.
  */
@@ -24,7 +72,11 @@ struct efx_tc_encap_action {
 	struct ip_tunnel_key key; /* 52 bytes */
 	u32 dest_mport; /* is copied into struct efx_tc_action_set */
 	u8 encap_hdr_len;
+	bool n_valid;
 	u8 encap_hdr[EFX_TC_MAX_ENCAP_HDR];
+	struct efx_neigh_binder *neigh;
+	struct list_head list; /* entry on neigh->users list */
+	struct list_head users; /* action sets using this encap_md */
 	struct rhash_head linkage; /* efx->tc_encap_ht */
 	refcount_t ref;
 	u32 fw_id; /* index of this entry in firmware encap table */
@@ -44,4 +96,8 @@ struct efx_tc_encap_action *efx_tc_flower_create_encap_md(
 void efx_tc_flower_release_encap_md(struct efx_nic *efx,
 				    struct efx_tc_encap_action *encap);
 
+void efx_tc_unregister_egdev(struct efx_nic *efx, struct net_device *net_dev);
+int efx_tc_netevent_event(struct efx_nic *efx, unsigned long event,
+			  void *ptr);
+
 #endif /* EFX_TC_ENCAP_ACTIONS_H */