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 #include <linux/netdevice.h>
8
9 struct net;
10 struct netlink_ext_ack;
11 struct cpumask;
12
13 /* Random bits of netdevice that don't need to be exposed */
14 #define FLOW_LIMIT_HISTORY (1 << 7) /* must be ^2 and !overflow buckets */
15 struct sd_flow_limit {
16 u64 count;
17 unsigned int num_buckets;
18 unsigned int history_head;
19 u16 history[FLOW_LIMIT_HISTORY];
20 u8 buckets[];
21 };
22
23 extern int netdev_flow_limit_table_len;
24
25 #ifdef CONFIG_PROC_FS
26 int __init dev_proc_init(void);
27 #else
28 #define dev_proc_init() 0
29 #endif
30
31 void linkwatch_init_dev(struct net_device *dev);
32 void linkwatch_run_queue(void);
33
34 void dev_addr_flush(struct net_device *dev);
35 int dev_addr_init(struct net_device *dev);
36 void dev_addr_check(struct net_device *dev);
37
38 /* sysctls not referred to from outside net/core/ */
39 extern int netdev_unregister_timeout_secs;
40 extern int weight_p;
41 extern int dev_weight_rx_bias;
42 extern int dev_weight_tx_bias;
43
44 extern struct rw_semaphore dev_addr_sem;
45
46 /* rtnl helpers */
47 extern struct list_head net_todo_list;
48 void netdev_run_todo(void);
49
50 /* netdev management, shared between various uAPI entry points */
51 struct netdev_name_node {
52 struct hlist_node hlist;
53 struct list_head list;
54 struct net_device *dev;
55 const char *name;
56 struct rcu_head rcu;
57 };
58
59 int netdev_get_name(struct net *net, char *name, int ifindex);
60 int dev_change_name(struct net_device *dev, const char *newname);
61
62 #define netdev_for_each_altname(dev, namenode) \
63 list_for_each_entry((namenode), &(dev)->name_node->list, list)
64 #define netdev_for_each_altname_safe(dev, namenode, next) \
65 list_for_each_entry_safe((namenode), (next), &(dev)->name_node->list, \
66 list)
67
68 int netdev_name_node_alt_create(struct net_device *dev, const char *name);
69 int netdev_name_node_alt_destroy(struct net_device *dev, const char *name);
70
71 int dev_validate_mtu(struct net_device *dev, int mtu,
72 struct netlink_ext_ack *extack);
73 int dev_set_mtu_ext(struct net_device *dev, int mtu,
74 struct netlink_ext_ack *extack);
75
76 int dev_get_phys_port_id(struct net_device *dev,
77 struct netdev_phys_item_id *ppid);
78 int dev_get_phys_port_name(struct net_device *dev,
79 char *name, size_t len);
80
81 int dev_change_proto_down(struct net_device *dev, bool proto_down);
82 void dev_change_proto_down_reason(struct net_device *dev, unsigned long mask,
83 u32 value);
84
85 typedef int (*bpf_op_t)(struct net_device *dev, struct netdev_bpf *bpf);
86 int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
87 int fd, int expected_fd, u32 flags);
88
89 int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len);
90 void dev_set_group(struct net_device *dev, int new_group);
91 int dev_change_carrier(struct net_device *dev, bool new_carrier);
92
93 void __dev_set_rx_mode(struct net_device *dev);
94
95 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags,
96 unsigned int gchanges, u32 portid,
97 const struct nlmsghdr *nlh);
98
99 void unregister_netdevice_many_notify(struct list_head *head,
100 u32 portid, const struct nlmsghdr *nlh);
101
102 static inline void netif_set_gso_max_size(struct net_device *dev,
103 unsigned int size)
104 {
105 /* dev->gso_max_size is read locklessly from sk_setup_caps() */
106 WRITE_ONCE(dev->gso_max_size, size);
107 if (size <= GSO_LEGACY_MAX_SIZE)
108 WRITE_ONCE(dev->gso_ipv4_max_size, size);
109 }
110
111 static inline void netif_set_gso_max_segs(struct net_device *dev,
112 unsigned int segs)
113 {
114 /* dev->gso_max_segs is read locklessly from sk_setup_caps() */
115 WRITE_ONCE(dev->gso_max_segs, segs);
116 }
117
118 static inline void netif_set_gro_max_size(struct net_device *dev,
119 unsigned int size)
120 {
121 /* This pairs with the READ_ONCE() in skb_gro_receive() */
122 WRITE_ONCE(dev->gro_max_size, size);
123 if (size <= GRO_LEGACY_MAX_SIZE)
124 WRITE_ONCE(dev->gro_ipv4_max_size, size);
125 }
126
127 static inline void netif_set_gso_ipv4_max_size(struct net_device *dev,
128 unsigned int size)
129 {
130 /* dev->gso_ipv4_max_size is read locklessly from sk_setup_caps() */
131 WRITE_ONCE(dev->gso_ipv4_max_size, size);
132 }
133
134 static inline void netif_set_gro_ipv4_max_size(struct net_device *dev,
135 unsigned int size)
136 {
137 /* This pairs with the READ_ONCE() in skb_gro_receive() */
138 WRITE_ONCE(dev->gro_ipv4_max_size, size);
139 }
140
141 int rps_cpumask_housekeeping(struct cpumask *mask);
142
143 #if defined(CONFIG_DEBUG_NET) && defined(CONFIG_BPF_SYSCALL)
144 void xdp_do_check_flushed(struct napi_struct *napi);
145 #else
146 static inline void xdp_do_check_flushed(struct napi_struct *napi) { }
147 #endif
148
149 struct napi_struct *napi_by_id(unsigned int napi_id);
150 void kick_defer_list_purge(struct softnet_data *sd, unsigned int cpu);
151
152 #define XMIT_RECURSION_LIMIT 8
153
154 #ifndef CONFIG_PREEMPT_RT
155 static inline bool dev_xmit_recursion(void)
156 {
157 return unlikely(__this_cpu_read(softnet_data.xmit.recursion) >
158 XMIT_RECURSION_LIMIT);
159 }
160
161 static inline void dev_xmit_recursion_inc(void)
162 {
163 __this_cpu_inc(softnet_data.xmit.recursion);
164 }
165
166 static inline void dev_xmit_recursion_dec(void)
167 {
168 __this_cpu_dec(softnet_data.xmit.recursion);
169 }
170 #else
171 static inline bool dev_xmit_recursion(void)
172 {
173 return unlikely(current->net_xmit.recursion > XMIT_RECURSION_LIMIT);
174 }
175
176 static inline void dev_xmit_recursion_inc(void)
177 {
178 current->net_xmit.recursion++;
179 }
180
181 static inline void dev_xmit_recursion_dec(void)
182 {
183 current->net_xmit.recursion--;
184 }
185 #endif
186
187 int dev_set_hwtstamp_phylib(struct net_device *dev,
188 struct kernel_hwtstamp_config *cfg,
189 struct netlink_ext_ack *extack);
190
191 #endif
192
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