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 */
 47struct 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
 71struct 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 */
 87int efx_tc_init_encap_actions(struct efx_nic *efx);
 88void efx_tc_destroy_encap_actions(struct efx_nic *efx);
 89void efx_tc_fini_encap_actions(struct efx_nic *efx);
 90
 91struct efx_tc_flow_rule;
 92bool efx_tc_check_ready(struct efx_nic *efx, struct efx_tc_flow_rule *rule);
 93
 94struct 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);
 97void efx_tc_flower_release_encap_md(struct efx_nic *efx,
 98				    struct efx_tc_encap_action *encap);
 99
100void efx_tc_unregister_egdev(struct efx_nic *efx, struct net_device *net_dev);
101int efx_tc_netevent_event(struct efx_nic *efx, unsigned long event,
102			  void *ptr);
103
104#else /* CONFIG_SFC_SRIOV */
105
106static 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 */