#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 *addr);

/**
 *	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 do 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)
{
	dst_cache->reset_ts = jiffies;
}

/**
 *	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 unsed.
 */
void dst_cache_destroy(struct dst_cache *dst_cache);

#endif
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'>include</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/net?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/net/irda?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'>irda</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/net/irda/irlap_event.h?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'>irlap_event.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-08 09:56:15 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-08 09:56:15 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/irda/irlap_event.h?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'>23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/net/irda/irlap_event.h?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'>4aff32d5f2f6fe2f54028bfd4d1b66fdd2f8d281</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/net/irda/irlap_event.h?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'>include/net/irda/irlap_event.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/irda/irlap_event.h?id=926af6273fc683cd98cd0ce7bf0d04a02eed6742'>926af6273fc683cd98cd0ce7bf0d04a02eed6742</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/net/irda/irlap_event.h?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b&amp;id2=926af6273fc683cd98cd0ce7bf0d04a02eed6742'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/irda/irlap_event.h?id=eeeefd41843218c55a8782a6920f044d9bf6207a'>eeeefd41843218c55a8782a6920f044d9bf6207a</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/net/irda/irlap_event.h?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b&amp;id2=eeeefd41843218c55a8782a6920f044d9bf6207a'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'for-linus' of git://git.kernel.dk/linux-block</div><div class='commit-msg'>Pull block fix from Jens Axboe:
 "A single fix that should go into 4.10, fixing a regression on some
  devices with the WRITE_SAME command"

* 'for-linus' of git://git.kernel.dk/linux-block:
  block: don't try Write Same from __blkdev_issue_zeroout
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=23fbe2cdc1de80120cf9ccd478ac57c3a3a0764b'>Diffstat</a> (limited to 'include/net/irda/irlap_event.h')</div><table summary='diffstat' class='diffstat'>