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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
911362c7 PA |
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 | ||
11 | struct 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 | */ | |
24 | struct 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 | */ | |
33 | struct 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 | */ | |
43 | void 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 | */ | |
56 | void dst_cache_set_ip6(struct dst_cache *dst_cache, struct dst_entry *dst, | |
4c1342d9 | 57 | const struct in6_addr *saddr); |
911362c7 PA |
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 | */ | |
66 | struct 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 | * | |
76b12974 | 74 | * This does not free the cached dst to avoid races and contentions. |
911362c7 PA |
75 | * the dst will be freed on later cache lookup. |
76 | */ | |
77 | static 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 | */ | |
87 | int 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 | */ | |
96 | void dst_cache_destroy(struct dst_cache *dst_cache); | |
97 | ||
98 | #endif |