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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110/* SPDX-License-Identifier: GPL-2.0 */#ifndef _NET_DST_CACHE_H#define _NET_DST_CACHE_H
#include <linux/jiffies.h>#include <net/dst.h>#if IS_ENABLED(CONFIG_IPV6)#include <net/ip6_fib.h>#endif
struct dst_cache { struct dst_cache_pcpu __percpu *cache; unsigned long reset_ts;};
/** * dst_cache_get - perform cache lookup * @dst_cache: the cache * * The caller should use dst_cache_get_ip4() if it need to retrieve the * source address to be used when xmitting to the cached dst. * local BH must be disabled. */struct dst_entry *dst_cache_get(struct dst_cache *dst_cache);
/** * dst_cache_get_ip4 - perform cache lookup and fetch ipv4 source address * @dst_cache: the cache * @saddr: return value for the retrieved source address * * local BH must be disabled. */struct rtable *dst_cache_get_ip4(struct dst_cache *dst_cache, __be32 *saddr);
/** * dst_cache_set_ip4 - store the ipv4 dst into the cache * @dst_cache: the cache * @dst: the entry to be cached * @saddr: the source address to be stored inside the cache * * local BH must be disabled. */void dst_cache_set_ip4(struct dst_cache *dst_cache, struct dst_entry *dst, __be32 saddr);
#if IS_ENABLED(CONFIG_IPV6)
/** * dst_cache_set_ip6 - store the ipv6 dst into the cache * @dst_cache: the cache * @dst: the entry to be cached * @saddr: the source address to be stored inside the cache * * local BH must be disabled. */void dst_cache_set_ip6(struct dst_cache *dst_cache, struct dst_entry *dst, const struct in6_addr *saddr);
/** * dst_cache_get_ip6 - perform cache lookup and fetch ipv6 source address * @dst_cache: the cache * @saddr: return value for the retrieved source address * * local BH must be disabled. */struct dst_entry *dst_cache_get_ip6(struct dst_cache *dst_cache, struct in6_addr *saddr);#endif
/** * dst_cache_reset - invalidate the cache contents * @dst_cache: the cache * * This does not free the cached dst to avoid races and contentions. * the dst will be freed on later cache lookup. */static inline void dst_cache_reset(struct dst_cache *dst_cache){ WRITE_ONCE(dst_cache->reset_ts, jiffies);}
/** * dst_cache_reset_now - invalidate the cache contents immediately * @dst_cache: the cache * * The caller must be sure there are no concurrent users, as this frees * all dst_cache users immediately, rather than waiting for the next * per-cpu usage like dst_cache_reset does. Most callers should use the * higher speed lazily-freed dst_cache_reset function instead. */void dst_cache_reset_now(struct dst_cache *dst_cache);
/** * dst_cache_init - initialize the cache, allocating the required storage * @dst_cache: the cache * @gfp: allocation flags */int dst_cache_init(struct dst_cache *dst_cache, gfp_t gfp);
/** * dst_cache_destroy - empty the cache and free the allocated storage * @dst_cache: the cache * * No synchronization is enforced: it must be called only when the cache * is unused. */void dst_cache_destroy(struct dst_cache *dst_cache);
#endif