| Paolo Abeni | 911362c | 2016-02-12 15:43:53 +0100 | [diff] [blame] | 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 |