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98 lines
2.5 KiB
98 lines
2.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _NET_DST_CACHE_H |
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#define _NET_DST_CACHE_H |
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#include <linux/jiffies.h> |
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#include <net/dst.h> |
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#if IS_ENABLED(CONFIG_IPV6) |
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#include <net/ip6_fib.h> |
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#endif |
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struct dst_cache { |
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struct dst_cache_pcpu __percpu *cache; |
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unsigned long reset_ts; |
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}; |
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/** |
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* dst_cache_get - perform cache lookup |
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* @dst_cache: the cache |
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* |
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* The caller should use dst_cache_get_ip4() if it need to retrieve the |
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* source address to be used when xmitting to the cached dst. |
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* local BH must be disabled. |
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*/ |
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struct dst_entry *dst_cache_get(struct dst_cache *dst_cache); |
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/** |
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* dst_cache_get_ip4 - perform cache lookup and fetch ipv4 source address |
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* @dst_cache: the cache |
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* @saddr: return value for the retrieved source address |
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* |
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* local BH must be disabled. |
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*/ |
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struct rtable *dst_cache_get_ip4(struct dst_cache *dst_cache, __be32 *saddr); |
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/** |
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* dst_cache_set_ip4 - store the ipv4 dst into the cache |
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* @dst_cache: the cache |
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* @dst: the entry to be cached |
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* @saddr: the source address to be stored inside the cache |
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* |
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* local BH must be disabled. |
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*/ |
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void dst_cache_set_ip4(struct dst_cache *dst_cache, struct dst_entry *dst, |
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__be32 saddr); |
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#if IS_ENABLED(CONFIG_IPV6) |
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/** |
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* dst_cache_set_ip6 - store the ipv6 dst into the cache |
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* @dst_cache: the cache |
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* @dst: the entry to be cached |
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* @saddr: the source address to be stored inside the cache |
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* |
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* local BH must be disabled. |
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*/ |
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void dst_cache_set_ip6(struct dst_cache *dst_cache, struct dst_entry *dst, |
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const struct in6_addr *saddr); |
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/** |
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* dst_cache_get_ip6 - perform cache lookup and fetch ipv6 source address |
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* @dst_cache: the cache |
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* @saddr: return value for the retrieved source address |
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* |
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* local BH must be disabled. |
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*/ |
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struct dst_entry *dst_cache_get_ip6(struct dst_cache *dst_cache, |
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struct in6_addr *saddr); |
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#endif |
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/** |
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* dst_cache_reset - invalidate the cache contents |
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* @dst_cache: the cache |
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* |
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* This does not free the cached dst to avoid races and contentions. |
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* the dst will be freed on later cache lookup. |
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*/ |
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static inline void dst_cache_reset(struct dst_cache *dst_cache) |
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{ |
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dst_cache->reset_ts = jiffies; |
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} |
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/** |
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* dst_cache_init - initialize the cache, allocating the required storage |
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* @dst_cache: the cache |
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* @gfp: allocation flags |
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*/ |
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int dst_cache_init(struct dst_cache *dst_cache, gfp_t gfp); |
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/** |
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* dst_cache_destroy - empty the cache and free the allocated storage |
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* @dst_cache: the cache |
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* |
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* No synchronization is enforced: it must be called only when the cache |
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* is unsed. |
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*/ |
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void dst_cache_destroy(struct dst_cache *dst_cache); |
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#endif
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