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 #if IS_ENABLED(CONFIG_NET_SHAPER) 39 void net_shaper_flush_netdev(struct net_device *dev); 40 #else 41 static inline void net_shaper_flush_netdev(struct net_device *dev) {} 42 #endif 43 44 /* sysctls not referred to from outside net/core/ */ 45 extern int netdev_unregister_timeout_secs; 46 extern int weight_p; 47 extern int dev_weight_rx_bias; 48 extern int dev_weight_tx_bias; 49 50 extern struct rw_semaphore dev_addr_sem; 51 52 /* rtnl helpers */ 53 extern struct list_head net_todo_list; 54 void netdev_run_todo(void); 55 56 /* netdev management, shared between various uAPI entry points */ 57 struct netdev_name_node { 58 struct hlist_node hlist; 59 struct list_head list; 60 struct net_device *dev; 61 const char *name; 62 struct rcu_head rcu; 63 }; 64 65 int netdev_get_name(struct net *net, char *name, int ifindex); 66 int dev_change_name(struct net_device *dev, const char *newname); 67 68 #define netdev_for_each_altname(dev, namenode) \ 69 list_for_each_entry((namenode), &(dev)->name_node->list, list) 70 #define netdev_for_each_altname_safe(dev, namenode, next) \ 71 list_for_each_entry_safe((namenode), (next), &(dev)->name_node->list, \ 72 list) 73 74 int netdev_name_node_alt_create(struct net_device *dev, const char *name); 75 int netdev_name_node_alt_destroy(struct net_device *dev, const char *name); 76 77 int dev_validate_mtu(struct net_device *dev, int mtu, 78 struct netlink_ext_ack *extack); 79 int dev_set_mtu_ext(struct net_device *dev, int mtu, 80 struct netlink_ext_ack *extack); 81 82 int dev_get_phys_port_id(struct net_device *dev, 83 struct netdev_phys_item_id *ppid); 84 int dev_get_phys_port_name(struct net_device *dev, 85 char *name, size_t len); 86 87 int dev_change_proto_down(struct net_device *dev, bool proto_down); 88 void dev_change_proto_down_reason(struct net_device *dev, unsigned long mask, 89 u32 value); 90 91 typedef int (*bpf_op_t)(struct net_device *dev, struct netdev_bpf *bpf); 92 int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack, 93 int fd, int expected_fd, u32 flags); 94 95 int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len); 96 void dev_set_group(struct net_device *dev, int new_group); 97 int dev_change_carrier(struct net_device *dev, bool new_carrier); 98 99 void __dev_set_rx_mode(struct net_device *dev); 100 101 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags, 102 unsigned int gchanges, u32 portid, 103 const struct nlmsghdr *nlh); 104 105 void unregister_netdevice_many_notify(struct list_head *head, 106 u32 portid, const struct nlmsghdr *nlh); 107 108 static inline void netif_set_gso_max_size(struct net_device *dev, 109 unsigned int size) 110 { 111 /* dev->gso_max_size is read locklessly from sk_setup_caps() */ 112 WRITE_ONCE(dev->gso_max_size, size); 113 if (size <= GSO_LEGACY_MAX_SIZE) 114 WRITE_ONCE(dev->gso_ipv4_max_size, size); 115 } 116 117 static inline void netif_set_gso_max_segs(struct net_device *dev, 118 unsigned int segs) 119 { 120 /* dev->gso_max_segs is read locklessly from sk_setup_caps() */ 121 WRITE_ONCE(dev->gso_max_segs, segs); 122 } 123 124 static inline void netif_set_gro_max_size(struct net_device *dev, 125 unsigned int size) 126 { 127 /* This pairs with the READ_ONCE() in skb_gro_receive() */ 128 WRITE_ONCE(dev->gro_max_size, size); 129 if (size <= GRO_LEGACY_MAX_SIZE) 130 WRITE_ONCE(dev->gro_ipv4_max_size, size); 131 } 132 133 static inline void netif_set_gso_ipv4_max_size(struct net_device *dev, 134 unsigned int size) 135 { 136 /* dev->gso_ipv4_max_size is read locklessly from sk_setup_caps() */ 137 WRITE_ONCE(dev->gso_ipv4_max_size, size); 138 } 139 140 static inline void netif_set_gro_ipv4_max_size(struct net_device *dev, 141 unsigned int size) 142 { 143 /* This pairs with the READ_ONCE() in skb_gro_receive() */ 144 WRITE_ONCE(dev->gro_ipv4_max_size, size); 145 } 146 147 int rps_cpumask_housekeeping(struct cpumask *mask); 148 149 #if defined(CONFIG_DEBUG_NET) && defined(CONFIG_BPF_SYSCALL) 150 void xdp_do_check_flushed(struct napi_struct *napi); 151 #else 152 static inline void xdp_do_check_flushed(struct napi_struct *napi) { } 153 #endif 154 155 struct napi_struct *napi_by_id(unsigned int napi_id); 156 void kick_defer_list_purge(struct softnet_data *sd, unsigned int cpu); 157 158 #define XMIT_RECURSION_LIMIT 8 159 160 #ifndef CONFIG_PREEMPT_RT 161 static inline bool dev_xmit_recursion(void) 162 { 163 return unlikely(__this_cpu_read(softnet_data.xmit.recursion) > 164 XMIT_RECURSION_LIMIT); 165 } 166 167 static inline void dev_xmit_recursion_inc(void) 168 { 169 __this_cpu_inc(softnet_data.xmit.recursion); 170 } 171 172 static inline void dev_xmit_recursion_dec(void) 173 { 174 __this_cpu_dec(softnet_data.xmit.recursion); 175 } 176 #else 177 static inline bool dev_xmit_recursion(void) 178 { 179 return unlikely(current->net_xmit.recursion > XMIT_RECURSION_LIMIT); 180 } 181 182 static inline void dev_xmit_recursion_inc(void) 183 { 184 current->net_xmit.recursion++; 185 } 186 187 static inline void dev_xmit_recursion_dec(void) 188 { 189 current->net_xmit.recursion--; 190 } 191 #endif 192 193 int dev_set_hwtstamp_phylib(struct net_device *dev, 194 struct kernel_hwtstamp_config *cfg, 195 struct netlink_ext_ack *extack); 196 197 #endif 198