net/core/dev.h

   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