1/* SPDX-License-Identifier: GPL-2.0-or-later */
  2#ifndef _NET_CORE_DEV_H
  3#define _NET_CORE_DEV_H
  4
  5#include <linux/types.h>
  6
  7struct net;
  8struct net_device;
  9struct netdev_bpf;
 10struct netdev_phys_item_id;
 11struct netlink_ext_ack;
 12struct cpumask;
 13
 14/* Random bits of netdevice that don't need to be exposed */
 15#define FLOW_LIMIT_HISTORY	(1 << 7)  /* must be ^2 and !overflow buckets */
 16struct sd_flow_limit {
 17	u64			count;
 18	unsigned int		num_buckets;
 19	unsigned int		history_head;
 20	u16			history[FLOW_LIMIT_HISTORY];
 21	u8			buckets[];
 22};
 23
 24extern int netdev_flow_limit_table_len;
 25
 26#ifdef CONFIG_PROC_FS
 27int __init dev_proc_init(void);
 28#else
 29#define dev_proc_init() 0
 30#endif
 31
 32void linkwatch_init_dev(struct net_device *dev);
 33void linkwatch_run_queue(void);
 34
 35void dev_addr_flush(struct net_device *dev);
 36int dev_addr_init(struct net_device *dev);
 37void dev_addr_check(struct net_device *dev);
 38
 39/* sysctls not referred to from outside net/core/ */
 40extern int		netdev_budget;
 41extern unsigned int	netdev_budget_usecs;
 42extern unsigned int	sysctl_skb_defer_max;
 43extern int		netdev_tstamp_prequeue;
 44extern int		netdev_unregister_timeout_secs;
 45extern int		weight_p;
 46extern int		dev_weight_rx_bias;
 47extern int		dev_weight_tx_bias;
 48
 49/* rtnl helpers */
 50extern struct list_head net_todo_list;
 51void netdev_run_todo(void);
 52
 53/* netdev management, shared between various uAPI entry points */
 54struct netdev_name_node {
 55	struct hlist_node hlist;
 56	struct list_head list;
 57	struct net_device *dev;
 58	const char *name;
 59};
 60
 61int netdev_get_name(struct net *net, char *name, int ifindex);
 62int dev_change_name(struct net_device *dev, const char *newname);
 63
 64#define netdev_for_each_altname(dev, namenode)				\
 65	list_for_each_entry((namenode), &(dev)->name_node->list, list)
 66#define netdev_for_each_altname_safe(dev, namenode, next)		\
 67	list_for_each_entry_safe((namenode), (next), &(dev)->name_node->list, \
 68				 list)
 69
 70int netdev_name_node_alt_create(struct net_device *dev, const char *name);
 71int netdev_name_node_alt_destroy(struct net_device *dev, const char *name);
 72
 73int dev_validate_mtu(struct net_device *dev, int mtu,
 74		     struct netlink_ext_ack *extack);
 75int dev_set_mtu_ext(struct net_device *dev, int mtu,
 76		    struct netlink_ext_ack *extack);
 77
 78int dev_get_phys_port_id(struct net_device *dev,
 79			 struct netdev_phys_item_id *ppid);
 80int dev_get_phys_port_name(struct net_device *dev,
 81			   char *name, size_t len);
 82
 83int dev_change_proto_down(struct net_device *dev, bool proto_down);
 84void dev_change_proto_down_reason(struct net_device *dev, unsigned long mask,
 85				  u32 value);
 86
 87typedef int (*bpf_op_t)(struct net_device *dev, struct netdev_bpf *bpf);
 88int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
 89		      int fd, int expected_fd, u32 flags);
 90
 91int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len);
 92void dev_set_group(struct net_device *dev, int new_group);
 93int dev_change_carrier(struct net_device *dev, bool new_carrier);
 94
 95void __dev_set_rx_mode(struct net_device *dev);
 96
 97void __dev_notify_flags(struct net_device *dev, unsigned int old_flags,
 98			unsigned int gchanges, u32 portid,
 99			const struct nlmsghdr *nlh);
100
101void unregister_netdevice_many_notify(struct list_head *head,
102				      u32 portid, const struct nlmsghdr *nlh);
103
104static inline void netif_set_gso_max_size(struct net_device *dev,
105					  unsigned int size)
106{
107	/* dev->gso_max_size is read locklessly from sk_setup_caps() */
108	WRITE_ONCE(dev->gso_max_size, size);
109	if (size <= GSO_LEGACY_MAX_SIZE)
110		WRITE_ONCE(dev->gso_ipv4_max_size, size);
111}
112
113static inline void netif_set_gso_max_segs(struct net_device *dev,
114					  unsigned int segs)
115{
116	/* dev->gso_max_segs is read locklessly from sk_setup_caps() */
117	WRITE_ONCE(dev->gso_max_segs, segs);
118}
119
120static inline void netif_set_gro_max_size(struct net_device *dev,
121					  unsigned int size)
122{
123	/* This pairs with the READ_ONCE() in skb_gro_receive() */
124	WRITE_ONCE(dev->gro_max_size, size);
125	if (size <= GRO_LEGACY_MAX_SIZE)
126		WRITE_ONCE(dev->gro_ipv4_max_size, size);
127}
128
129static inline void netif_set_gso_ipv4_max_size(struct net_device *dev,
130					       unsigned int size)
131{
132	/* dev->gso_ipv4_max_size is read locklessly from sk_setup_caps() */
133	WRITE_ONCE(dev->gso_ipv4_max_size, size);
134}
135
136static inline void netif_set_gro_ipv4_max_size(struct net_device *dev,
137					       unsigned int size)
138{
139	/* This pairs with the READ_ONCE() in skb_gro_receive() */
140	WRITE_ONCE(dev->gro_ipv4_max_size, size);
141}
142
143int rps_cpumask_housekeeping(struct cpumask *mask);
144
145#if defined(CONFIG_DEBUG_NET) && defined(CONFIG_BPF_SYSCALL)
146void xdp_do_check_flushed(struct napi_struct *napi);
147#else
148static inline void xdp_do_check_flushed(struct napi_struct *napi) { }
149#endif
150
151struct napi_struct *napi_by_id(unsigned int napi_id);
152#endif