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 netif_set_gso_max_size(struct net_device * dev,unsigned int size)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 netif_set_gso_max_segs(struct net_device * dev,unsigned int segs)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 netif_set_gro_max_size(struct net_device * dev,unsigned int size)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 netif_set_gso_ipv4_max_size(struct net_device * dev,unsigned int size)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 netif_set_gro_ipv4_max_size(struct net_device * dev,unsigned int size)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 xdp_do_check_flushed(struct napi_struct * napi)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 dev_xmit_recursion(void)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 dev_xmit_recursion_inc(void)161 static inline void dev_xmit_recursion_inc(void) 162 { 163 __this_cpu_inc(softnet_data.xmit.recursion); 164 } 165 dev_xmit_recursion_dec(void)166 static inline void dev_xmit_recursion_dec(void) 167 { 168 __this_cpu_dec(softnet_data.xmit.recursion); 169 } 170 #else dev_xmit_recursion(void)171 static inline bool dev_xmit_recursion(void) 172 { 173 return unlikely(current->net_xmit.recursion > XMIT_RECURSION_LIMIT); 174 } 175 dev_xmit_recursion_inc(void)176 static inline void dev_xmit_recursion_inc(void) 177 { 178 current->net_xmit.recursion++; 179 } 180 dev_xmit_recursion_dec(void)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