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/* SPDX-License-Identifier: GPL-2.0-only */
/****************************************************************************
* Driver for Solarflare network controllers and boards
* Copyright 2023, Advanced Micro Devices, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, incorporated herein by reference.
*/
#ifndef EFX_TC_ENCAP_ACTIONS_H
#define EFX_TC_ENCAP_ACTIONS_H
#include "net_driver.h"
#if IS_ENABLED(CONFIG_SFC_SRIOV)
#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.
*/
#define EFX_TC_MAX_ENCAP_HDR 126
struct efx_tc_encap_action {
enum efx_encap_type type;
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 */
};
/* create/uncreate/teardown hashtables */
int efx_tc_init_encap_actions(struct efx_nic *efx);
void efx_tc_destroy_encap_actions(struct efx_nic *efx);
void efx_tc_fini_encap_actions(struct efx_nic *efx);
struct efx_tc_flow_rule;
bool efx_tc_check_ready(struct efx_nic *efx, struct efx_tc_flow_rule *rule);
struct efx_tc_encap_action *efx_tc_flower_create_encap_md(
struct efx_nic *efx, const struct ip_tunnel_info *info,
struct net_device *egdev, struct netlink_ext_ack *extack);
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);
#else /* CONFIG_SFC_SRIOV */
static inline int efx_tc_netevent_event(struct efx_nic *efx,
unsigned long event, void *ptr)
{
return NOTIFY_DONE;
}
#endif /* CONFIG_SFC_SRIOV */
#endif /* EFX_TC_ENCAP_ACTIONS_H */
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