| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _NET_DST_OPS_H |
| #define _NET_DST_OPS_H |
| #include <linux/types.h> |
| #include <linux/percpu_counter.h> |
| #include <linux/cache.h> |
| |
| struct dst_entry; |
| struct kmem_cachep; |
| struct net_device; |
| struct sk_buff; |
| struct sock; |
| struct net; |
| |
| struct dst_ops { |
| unsigned short family; |
| unsigned int gc_thresh; |
| |
| void (*gc)(struct dst_ops *ops); |
| struct dst_entry * (*check)(struct dst_entry *, __u32 cookie); |
| unsigned int (*default_advmss)(const struct dst_entry *); |
| unsigned int (*mtu)(const struct dst_entry *); |
| u32 * (*cow_metrics)(struct dst_entry *, unsigned long); |
| void (*destroy)(struct dst_entry *); |
| void (*ifdown)(struct dst_entry *, |
| struct net_device *dev); |
| void (*negative_advice)(struct sock *sk, struct dst_entry *); |
| void (*link_failure)(struct sk_buff *); |
| void (*update_pmtu)(struct dst_entry *dst, struct sock *sk, |
| struct sk_buff *skb, u32 mtu, |
| bool confirm_neigh); |
| void (*redirect)(struct dst_entry *dst, struct sock *sk, |
| struct sk_buff *skb); |
| int (*local_out)(struct net *net, struct sock *sk, struct sk_buff *skb); |
| struct neighbour * (*neigh_lookup)(const struct dst_entry *dst, |
| struct sk_buff *skb, |
| const void *daddr); |
| void (*confirm_neigh)(const struct dst_entry *dst, |
| const void *daddr); |
| |
| struct kmem_cache *kmem_cachep; |
| |
| struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp; |
| }; |
| |
| static inline int dst_entries_get_fast(struct dst_ops *dst) |
| { |
| return percpu_counter_read_positive(&dst->pcpuc_entries); |
| } |
| |
| static inline int dst_entries_get_slow(struct dst_ops *dst) |
| { |
| return percpu_counter_sum_positive(&dst->pcpuc_entries); |
| } |
| |
| #define DST_PERCPU_COUNTER_BATCH 32 |
| static inline void dst_entries_add(struct dst_ops *dst, int val) |
| { |
| percpu_counter_add_batch(&dst->pcpuc_entries, val, |
| DST_PERCPU_COUNTER_BATCH); |
| } |
| |
| static inline int dst_entries_init(struct dst_ops *dst) |
| { |
| return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL); |
| } |
| |
| static inline void dst_entries_destroy(struct dst_ops *dst) |
| { |
| percpu_counter_destroy(&dst->pcpuc_entries); |
| } |
| |
| #endif |