| 1 |
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| 2 | #ifndef _NET_DST_CACHE_H
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| 3 | #define _NET_DST_CACHE_H
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| 4 |
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| 5 | #include <linux/jiffies.h>
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| 6 | #include <net/dst.h>
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| 7 | #if IS_ENABLED(CONFIG_IPV6)
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| 8 | #include <net/ip6_fib.h>
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| 9 | #endif
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| 10 |
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| 11 | struct dst_cache {
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| 12 | struct dst_cache_pcpu __percpu *cache;
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| 13 | unsigned long reset_ts;
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| 14 | };
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| 15 |
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| 16 | |
| 17 | * dst_cache_get - perform cache lookup
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| 18 | * @dst_cache: the cache
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| 19 | *
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| 20 | * The caller should use dst_cache_get_ip4() if it need to retrieve the
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| 21 | * source address to be used when xmitting to the cached dst.
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| 22 | * local BH must be disabled.
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| 23 |
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| 24 | struct dst_entry *dst_cache_get(struct dst_cache *dst_cache);
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| 25 |
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| 26 | |
| 27 | * dst_cache_get_ip4 - perform cache lookup and fetch ipv4 source address
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| 28 | * @dst_cache: the cache
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| 29 | * @saddr: return value for the retrieved source address
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| 30 | *
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| 31 | * local BH must be disabled.
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| 32 |
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| 33 | struct rtable *dst_cache_get_ip4(struct dst_cache *dst_cache, __be32 *saddr);
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| 34 |
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| 35 | |
| 36 | * dst_cache_set_ip4 - store the ipv4 dst into the cache
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| 37 | * @dst_cache: the cache
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| 38 | * @dst: the entry to be cached
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| 39 | * @saddr: the source address to be stored inside the cache
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| 40 | *
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| 41 | * local BH must be disabled.
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| 42 |
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| 43 | void dst_cache_set_ip4(struct dst_cache *dst_cache, struct dst_entry *dst,
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| 44 | __be32 saddr);
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| 45 |
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| 46 | #if IS_ENABLED(CONFIG_IPV6)
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| 47 |
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| 48 | |
| 49 | * dst_cache_set_ip6 - store the ipv6 dst into the cache
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| 50 | * @dst_cache: the cache
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| 51 | * @dst: the entry to be cached
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| 52 | * @saddr: the source address to be stored inside the cache
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| 53 | *
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| 54 | * local BH must be disabled.
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| 55 |
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| 56 | void dst_cache_set_ip6(struct dst_cache *dst_cache, struct dst_entry *dst,
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| 57 | const struct in6_addr *saddr);
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| 58 |
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| 59 | |
| 60 | * dst_cache_get_ip6 - perform cache lookup and fetch ipv6 source address
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| 61 | * @dst_cache: the cache
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| 62 | * @saddr: return value for the retrieved source address
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| 63 | *
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| 64 | * local BH must be disabled.
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| 65 |
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| 66 | struct dst_entry *dst_cache_get_ip6(struct dst_cache *dst_cache,
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| 67 | struct in6_addr *saddr);
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| 68 | #endif
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| 69 |
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| 70 | |
| 71 | * dst_cache_reset - invalidate the cache contents
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| 72 | * @dst_cache: the cache
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| 73 | *
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| 74 | * This does not free the cached dst to avoid races and contentions.
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| 75 | * the dst will be freed on later cache lookup.
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| 76 |
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| 77 | static inline void dst_cache_reset(struct dst_cache *dst_cache)
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| 78 | {
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| 79 | WRITE_ONCE(dst_cache->reset_ts, jiffies);
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| 80 | }
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| 81 |
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| 82 | |
| 83 | * dst_cache_reset_now - invalidate the cache contents immediately
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| 84 | * @dst_cache: the cache
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| 85 | *
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| 86 | * The caller must be sure there are no concurrent users, as this frees
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| 87 | * all dst_cache users immediately, rather than waiting for the next
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| 88 | * per-cpu usage like dst_cache_reset does. Most callers should use the
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| 89 | * higher speed lazily-freed dst_cache_reset function instead.
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| 90 |
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| 91 | void dst_cache_reset_now(struct dst_cache *dst_cache);
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| 92 |
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| 93 | |
| 94 | * dst_cache_init - initialize the cache, allocating the required storage
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| 95 | * @dst_cache: the cache
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| 96 | * @gfp: allocation flags
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| 97 |
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| 98 | int dst_cache_init(struct dst_cache *dst_cache, gfp_t gfp);
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| 99 |
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| 100 | |
| 101 | * dst_cache_destroy - empty the cache and free the allocated storage
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| 102 | * @dst_cache: the cache
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| 103 | *
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| 104 | * No synchronization is enforced: it must be called only when the cache
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| 105 | * is unused.
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| 106 |
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| 107 | void dst_cache_destroy(struct dst_cache *dst_cache);
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| 108 |
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| 109 | #endif
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