1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /****************************************************************************
3  * Driver for Solarflare network controllers and boards
4  * Copyright 2023, Advanced Micro Devices, Inc.
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License version 2 as published
8  * by the Free Software Foundation, incorporated herein by reference.
9  */
10 
11 #ifndef EFX_TC_ENCAP_ACTIONS_H
12 #define EFX_TC_ENCAP_ACTIONS_H
13 #include "net_driver.h"
14 
15 #if IS_ENABLED(CONFIG_SFC_SRIOV)
16 #include <linux/refcount.h>
17 #include <net/tc_act/tc_tunnel_key.h>
18 
19 /**
20  * struct efx_neigh_binder - driver state for a neighbour entry
21  * @net: the network namespace in which this neigh resides
22  * @dst_ip: the IPv4 destination address resolved by this neigh
23  * @dst_ip6: the IPv6 destination address resolved by this neigh
24  * @ha: the hardware (Ethernet) address of the neighbour
25  * @n_valid: true if the neighbour is in NUD_VALID state
26  * @lock: protects @ha and @n_valid
27  * @ttl: Time To Live associated with the route used
28  * @dying: set when egdev is going away, to skip further updates
29  * @egdev: egress device from the route lookup.  Holds a reference
30  * @dev_tracker: reference tracker entry for @egdev
31  * @ns_tracker: reference tracker entry for @ns
32  * @ref: counts encap actions referencing this entry
33  * @used: jiffies of last time traffic hit any encap action using this.
34  *      When counter reads update this, a new neighbour event is sent to
35  *      indicate that the neighbour entry is still in use.
36  * @users: list of &struct efx_tc_encap_action
37  * @linkage: entry in efx->neigh_ht (keys are @net, @dst_ip, @dst_ip6).
38  * @work: processes neighbour state changes, updates the encap actions
39  * @efx: owning NIC instance.
40  *
41  * Associates a neighbour entry with the encap actions that are
42  * interested in it, allowing the latter to be updated when the
43  * neighbour details change.
44  * Whichever of @dst_ip and @dst_ip6 is not in use will be all-zeroes,
45  * this distinguishes IPv4 from IPv6 entries.
46  */
47 struct efx_neigh_binder {
48 	struct net *net;
49 	__be32 dst_ip;
50 	struct in6_addr dst_ip6;
51 	char ha[ETH_ALEN];
52 	bool n_valid;
53 	rwlock_t lock;
54 	u8 ttl;
55 	bool dying;
56 	struct net_device *egdev;
57 	netdevice_tracker dev_tracker;
58 	netns_tracker ns_tracker;
59 	refcount_t ref;
60 	unsigned long used;
61 	struct list_head users;
62 	struct rhash_head linkage;
63 	struct work_struct work;
64 	struct efx_nic *efx;
65 };
66 
67 /* This limit is arbitrary; current hardware (SN1022) handles encap headers
68  * of up to 126 bytes, but that limit is not enshrined in the MCDI protocol.
69  */
70 #define EFX_TC_MAX_ENCAP_HDR	126
71 struct efx_tc_encap_action {
72 	enum efx_encap_type type;
73 	struct ip_tunnel_key key; /* 52 bytes */
74 	u32 dest_mport; /* is copied into struct efx_tc_action_set */
75 	u8 encap_hdr_len;
76 	bool n_valid;
77 	u8 encap_hdr[EFX_TC_MAX_ENCAP_HDR];
78 	struct efx_neigh_binder *neigh;
79 	struct list_head list; /* entry on neigh->users list */
80 	struct list_head users; /* action sets using this encap_md */
81 	struct rhash_head linkage; /* efx->tc_encap_ht */
82 	refcount_t ref;
83 	u32 fw_id; /* index of this entry in firmware encap table */
84 };
85 
86 /* create/uncreate/teardown hashtables */
87 int efx_tc_init_encap_actions(struct efx_nic *efx);
88 void efx_tc_destroy_encap_actions(struct efx_nic *efx);
89 void efx_tc_fini_encap_actions(struct efx_nic *efx);
90 
91 struct efx_tc_flow_rule;
92 bool efx_tc_check_ready(struct efx_nic *efx, struct efx_tc_flow_rule *rule);
93 
94 struct efx_tc_encap_action *efx_tc_flower_create_encap_md(
95 			struct efx_nic *efx, const struct ip_tunnel_info *info,
96 			struct net_device *egdev, struct netlink_ext_ack *extack);
97 void efx_tc_flower_release_encap_md(struct efx_nic *efx,
98 				    struct efx_tc_encap_action *encap);
99 
100 void efx_tc_unregister_egdev(struct efx_nic *efx, struct net_device *net_dev);
101 int efx_tc_netevent_event(struct efx_nic *efx, unsigned long event,
102 			  void *ptr);
103 
104 #else /* CONFIG_SFC_SRIOV */
105 
106 static inline int efx_tc_netevent_event(struct efx_nic *efx,
107 					unsigned long event, void *ptr)
108 {
109 	return NOTIFY_DONE;
110 }
111 
112 #endif /* CONFIG_SFC_SRIOV */
113 
114 #endif /* EFX_TC_ENCAP_ACTIONS_H */
115