1#ifndef _NET_DST_CACHE_H
 2#define _NET_DST_CACHE_H
 3
 4#include <linux/jiffies.h>
 5#include <net/dst.h>
 6#if IS_ENABLED(CONFIG_IPV6)
 7#include <net/ip6_fib.h>
 8#endif
 9
10struct dst_cache {
11	struct dst_cache_pcpu __percpu *cache;
12	unsigned long reset_ts;
13};
14
15/**
16 *	dst_cache_get - perform cache lookup
17 *	@dst_cache: the cache
18 *
19 *	The caller should use dst_cache_get_ip4() if it need to retrieve the
20 *	source address to be used when xmitting to the cached dst.
21 *	local BH must be disabled.
22 */
23struct dst_entry *dst_cache_get(struct dst_cache *dst_cache);
24
25/**
26 *	dst_cache_get_ip4 - perform cache lookup and fetch ipv4 source address
27 *	@dst_cache: the cache
28 *	@saddr: return value for the retrieved source address
29 *
30 *	local BH must be disabled.
31 */
32struct rtable *dst_cache_get_ip4(struct dst_cache *dst_cache, __be32 *saddr);
33
34/**
35 *	dst_cache_set_ip4 - store the ipv4 dst into the cache
36 *	@dst_cache: the cache
37 *	@dst: the entry to be cached
38 *	@saddr: the source address to be stored inside the cache
39 *
40 *	local BH must be disabled.
41 */
42void dst_cache_set_ip4(struct dst_cache *dst_cache, struct dst_entry *dst,
43		       __be32 saddr);
44
45#if IS_ENABLED(CONFIG_IPV6)
46
47/**
48 *	dst_cache_set_ip6 - store the ipv6 dst into the cache
49 *	@dst_cache: the cache
50 *	@dst: the entry to be cached
51 *	@saddr: the source address to be stored inside the cache
52 *
53 *	local BH must be disabled.
54 */
55void dst_cache_set_ip6(struct dst_cache *dst_cache, struct dst_entry *dst,
56		       const struct in6_addr *addr);
57
58/**
59 *	dst_cache_get_ip6 - perform cache lookup and fetch ipv6 source address
60 *	@dst_cache: the cache
61 *	@saddr: return value for the retrieved source address
62 *
63 *	local BH must be disabled.
64 */
65struct dst_entry *dst_cache_get_ip6(struct dst_cache *dst_cache,
66				    struct in6_addr *saddr);
67#endif
68
69/**
70 *	dst_cache_reset - invalidate the cache contents
71 *	@dst_cache: the cache
72 *
73 *	This do not free the cached dst to avoid races and contentions.
74 *	the dst will be freed on later cache lookup.
75 */
76static inline void dst_cache_reset(struct dst_cache *dst_cache)
77{
78	dst_cache->reset_ts = jiffies;
79}
80
81/**
82 *	dst_cache_init - initialize the cache, allocating the required storage
83 *	@dst_cache: the cache
84 *	@gfp: allocation flags
85 */
86int dst_cache_init(struct dst_cache *dst_cache, gfp_t gfp);
87
88/**
89 *	dst_cache_destroy - empty the cache and free the allocated storage
90 *	@dst_cache: the cache
91 *
92 *	No synchronization is enforced: it must be called only when the cache
93 *	is unsed.
94 */
95void dst_cache_destroy(struct dst_cache *dst_cache);
96
97#endif

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _NET_DST_CACHE_H
 3#define _NET_DST_CACHE_H
 4
 5#include <linux/jiffies.h>
 6#include <net/dst.h>
 7#if IS_ENABLED(CONFIG_IPV6)
 8#include <net/ip6_fib.h>
 9#endif
10
11struct dst_cache {
12	struct dst_cache_pcpu __percpu *cache;
13	unsigned long reset_ts;
14};
15
16/**
17 *	dst_cache_get - perform cache lookup
18 *	@dst_cache: the cache
19 *
20 *	The caller should use dst_cache_get_ip4() if it need to retrieve the
21 *	source address to be used when xmitting to the cached dst.
22 *	local BH must be disabled.
23 */
24struct dst_entry *dst_cache_get(struct dst_cache *dst_cache);
25
26/**
27 *	dst_cache_get_ip4 - perform cache lookup and fetch ipv4 source address
28 *	@dst_cache: the cache
29 *	@saddr: return value for the retrieved source address
30 *
31 *	local BH must be disabled.
32 */
33struct rtable *dst_cache_get_ip4(struct dst_cache *dst_cache, __be32 *saddr);
34
35/**
36 *	dst_cache_set_ip4 - store the ipv4 dst into the cache
37 *	@dst_cache: the cache
38 *	@dst: the entry to be cached
39 *	@saddr: the source address to be stored inside the cache
40 *
41 *	local BH must be disabled.
42 */
43void dst_cache_set_ip4(struct dst_cache *dst_cache, struct dst_entry *dst,
44		       __be32 saddr);
45
46#if IS_ENABLED(CONFIG_IPV6)
47
48/**
49 *	dst_cache_set_ip6 - store the ipv6 dst into the cache
50 *	@dst_cache: the cache
51 *	@dst: the entry to be cached
52 *	@saddr: the source address to be stored inside the cache
53 *
54 *	local BH must be disabled.
55 */
56void dst_cache_set_ip6(struct dst_cache *dst_cache, struct dst_entry *dst,
57		       const struct in6_addr *saddr);
58
59/**
60 *	dst_cache_get_ip6 - perform cache lookup and fetch ipv6 source address
61 *	@dst_cache: the cache
62 *	@saddr: return value for the retrieved source address
63 *
64 *	local BH must be disabled.
65 */
66struct dst_entry *dst_cache_get_ip6(struct dst_cache *dst_cache,
67				    struct in6_addr *saddr);
68#endif
69
70/**
71 *	dst_cache_reset - invalidate the cache contents
72 *	@dst_cache: the cache
73 *
74 *	This does not free the cached dst to avoid races and contentions.
75 *	the dst will be freed on later cache lookup.
76 */
77static inline void dst_cache_reset(struct dst_cache *dst_cache)
78{
79	dst_cache->reset_ts = jiffies;
80}
81
82/**
83 *	dst_cache_init - initialize the cache, allocating the required storage
84 *	@dst_cache: the cache
85 *	@gfp: allocation flags
86 */
87int dst_cache_init(struct dst_cache *dst_cache, gfp_t gfp);
88
89/**
90 *	dst_cache_destroy - empty the cache and free the allocated storage
91 *	@dst_cache: the cache
92 *
93 *	No synchronization is enforced: it must be called only when the cache
94 *	is unsed.
95 */
96void dst_cache_destroy(struct dst_cache *dst_cache);
97
98#endif