110 lines
3.0 KiB
C
110 lines
3.0 KiB
C
/* 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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WRITE_ONCE(dst_cache->reset_ts, jiffies);
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}
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/**
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* dst_cache_reset_now - invalidate the cache contents immediately
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* @dst_cache: the cache
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*
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* The caller must be sure there are no concurrent users, as this frees
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* all dst_cache users immediately, rather than waiting for the next
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* per-cpu usage like dst_cache_reset does. Most callers should use the
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* higher speed lazily-freed dst_cache_reset function instead.
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*/
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void dst_cache_reset_now(struct dst_cache *dst_cache);
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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 unused.
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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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