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911362c7 PA |
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 | ||
10 | struct 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 | */ | |
23 | struct 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 | */ | |
32 | struct 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 | */ | |
42 | void 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 | */ | |
55 | void 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 | */ | |
65 | struct 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 | */ | |
76 | static 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 | */ | |
86 | int 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 | */ | |
95 | void dst_cache_destroy(struct dst_cache *dst_cache); | |
96 | ||
97 | #endif |