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