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[XFRM]: Dynamic xfrm_state hash table sizing.
The grow algorithm is simple, we grow if: 1) we see a hash chain collision at insert, and 2) we haven't hit the hash size limit (currently 1*1024*1024 slots), and 3) the number of xfrm_state objects is > the current hash mask All of this needs some tweaking. Remove __initdata from "hashdist" so we can use it safely at run time. Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
parent
8f126e37c0
commit
f034b5d4ef
@ -114,7 +114,7 @@ extern void *__init alloc_large_system_hash(const char *tablename,
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#else
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#define HASHDIST_DEFAULT 0
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#endif
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extern int __initdata hashdist; /* Distribute hashes across NUMA nodes? */
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extern int hashdist; /* Distribute hashes across NUMA nodes? */
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#endif /* _LINUX_BOOTMEM_H */
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@ -2363,7 +2363,7 @@ int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write,
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return 0;
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}
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__initdata int hashdist = HASHDIST_DEFAULT;
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int hashdist = HASHDIST_DEFAULT;
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#ifdef CONFIG_NUMA
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static int __init set_hashdist(char *str)
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@ -18,6 +18,9 @@
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#include <linux/pfkeyv2.h>
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#include <linux/ipsec.h>
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#include <linux/module.h>
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#include <linux/bootmem.h>
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#include <linux/vmalloc.h>
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#include <linux/cache.h>
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#include <asm/uaccess.h>
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struct sock *xfrm_nl;
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@ -38,102 +41,230 @@ EXPORT_SYMBOL(sysctl_xfrm_aevent_rseqth);
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static DEFINE_SPINLOCK(xfrm_state_lock);
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#define XFRM_DST_HSIZE 1024
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/* Hash table to find appropriate SA towards given target (endpoint
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* of tunnel or destination of transport mode) allowed by selector.
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*
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* Main use is finding SA after policy selected tunnel or transport mode.
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* Also, it can be used by ah/esp icmp error handler to find offending SA.
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*/
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static struct hlist_head xfrm_state_bydst[XFRM_DST_HSIZE];
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static struct hlist_head xfrm_state_bysrc[XFRM_DST_HSIZE];
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static struct hlist_head xfrm_state_byspi[XFRM_DST_HSIZE];
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static struct hlist_head *xfrm_state_bydst __read_mostly;
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static struct hlist_head *xfrm_state_bysrc __read_mostly;
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static struct hlist_head *xfrm_state_byspi __read_mostly;
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static unsigned int xfrm_state_hmask __read_mostly;
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static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
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static unsigned int xfrm_state_num;
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static __inline__
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unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
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static inline unsigned int __xfrm4_dst_hash(xfrm_address_t *addr, unsigned int hmask)
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{
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unsigned h;
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unsigned int h;
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h = ntohl(addr->a4);
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h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
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h = (h ^ (h>>16)) & hmask;
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return h;
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}
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static __inline__
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unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
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static inline unsigned int __xfrm6_dst_hash(xfrm_address_t *addr, unsigned int hmask)
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{
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unsigned h;
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unsigned int h;
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h = ntohl(addr->a6[2]^addr->a6[3]);
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h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
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h = (h ^ (h>>16)) & hmask;
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return h;
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}
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static __inline__
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unsigned __xfrm4_src_hash(xfrm_address_t *addr)
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static inline unsigned int __xfrm4_src_hash(xfrm_address_t *addr, unsigned int hmask)
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{
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return __xfrm4_dst_hash(addr);
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return __xfrm4_dst_hash(addr, hmask);
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}
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static __inline__
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unsigned __xfrm6_src_hash(xfrm_address_t *addr)
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static inline unsigned int __xfrm6_src_hash(xfrm_address_t *addr, unsigned int hmask)
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{
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return __xfrm6_dst_hash(addr);
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return __xfrm6_dst_hash(addr, hmask);
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}
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static __inline__
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unsigned xfrm_src_hash(xfrm_address_t *addr, unsigned short family)
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static inline unsigned __xfrm_src_hash(xfrm_address_t *addr, unsigned short family, unsigned int hmask)
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{
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switch (family) {
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case AF_INET:
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return __xfrm4_src_hash(addr);
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return __xfrm4_src_hash(addr, hmask);
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case AF_INET6:
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return __xfrm6_src_hash(addr);
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return __xfrm6_src_hash(addr, hmask);
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}
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return 0;
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}
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static __inline__
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unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
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static inline unsigned xfrm_src_hash(xfrm_address_t *addr, unsigned short family)
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{
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return __xfrm_src_hash(addr, family, xfrm_state_hmask);
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}
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static inline unsigned int __xfrm_dst_hash(xfrm_address_t *addr, unsigned short family, unsigned int hmask)
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{
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switch (family) {
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case AF_INET:
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return __xfrm4_dst_hash(addr);
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return __xfrm4_dst_hash(addr, hmask);
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case AF_INET6:
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return __xfrm6_dst_hash(addr);
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return __xfrm6_dst_hash(addr, hmask);
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}
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return 0;
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}
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static __inline__
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unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
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static inline unsigned int xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
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{
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unsigned h;
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return __xfrm_dst_hash(addr, family, xfrm_state_hmask);
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}
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static inline unsigned int __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto,
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unsigned int hmask)
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{
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unsigned int h;
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h = ntohl(addr->a4^spi^proto);
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h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
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h = (h ^ (h>>10) ^ (h>>20)) & hmask;
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return h;
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}
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static __inline__
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unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
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static inline unsigned int __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto,
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unsigned int hmask)
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{
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unsigned h;
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unsigned int h;
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h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
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h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
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h = (h ^ (h>>10) ^ (h>>20)) & hmask;
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return h;
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}
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static __inline__
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unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
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static inline
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unsigned __xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family,
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unsigned int hmask)
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{
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switch (family) {
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case AF_INET:
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return __xfrm4_spi_hash(addr, spi, proto);
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return __xfrm4_spi_hash(addr, spi, proto, hmask);
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case AF_INET6:
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return __xfrm6_spi_hash(addr, spi, proto);
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return __xfrm6_spi_hash(addr, spi, proto, hmask);
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}
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return 0; /*XXX*/
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}
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static inline unsigned int
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xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
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{
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return __xfrm_spi_hash(addr, spi, proto, family, xfrm_state_hmask);
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}
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static struct hlist_head *xfrm_state_hash_alloc(unsigned int sz)
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{
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struct hlist_head *n;
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if (sz <= PAGE_SIZE)
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n = kmalloc(sz, GFP_KERNEL);
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else if (hashdist)
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n = __vmalloc(sz, GFP_KERNEL, PAGE_KERNEL);
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else
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n = (struct hlist_head *)
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__get_free_pages(GFP_KERNEL, get_order(sz));
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if (n)
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memset(n, 0, sz);
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return n;
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}
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static void xfrm_state_hash_free(struct hlist_head *n, unsigned int sz)
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{
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if (sz <= PAGE_SIZE)
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kfree(n);
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else if (hashdist)
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vfree(n);
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else
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free_pages((unsigned long)n, get_order(sz));
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}
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static void xfrm_hash_transfer(struct hlist_head *list,
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struct hlist_head *ndsttable,
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struct hlist_head *nsrctable,
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struct hlist_head *nspitable,
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unsigned int nhashmask)
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{
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struct hlist_node *entry, *tmp;
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struct xfrm_state *x;
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hlist_for_each_entry_safe(x, entry, tmp, list, bydst) {
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unsigned int h;
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h = __xfrm_dst_hash(&x->id.daddr, x->props.family, nhashmask);
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hlist_add_head(&x->bydst, ndsttable+h);
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h = __xfrm_src_hash(&x->props.saddr, x->props.family,
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nhashmask);
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hlist_add_head(&x->bysrc, nsrctable+h);
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h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto,
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x->props.family, nhashmask);
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hlist_add_head(&x->byspi, nspitable+h);
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}
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}
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static unsigned long xfrm_hash_new_size(void)
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{
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return ((xfrm_state_hmask + 1) << 1) *
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sizeof(struct hlist_head);
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}
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static DEFINE_MUTEX(hash_resize_mutex);
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static void xfrm_hash_resize(void *__unused)
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{
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struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
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unsigned long nsize, osize;
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unsigned int nhashmask, ohashmask;
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int i;
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mutex_lock(&hash_resize_mutex);
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nsize = xfrm_hash_new_size();
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ndst = xfrm_state_hash_alloc(nsize);
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if (!ndst)
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goto out_unlock;
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nsrc = xfrm_state_hash_alloc(nsize);
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if (!nsrc) {
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xfrm_state_hash_free(ndst, nsize);
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goto out_unlock;
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}
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nspi = xfrm_state_hash_alloc(nsize);
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if (!nspi) {
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xfrm_state_hash_free(ndst, nsize);
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xfrm_state_hash_free(nsrc, nsize);
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goto out_unlock;
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}
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spin_lock_bh(&xfrm_state_lock);
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nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
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for (i = xfrm_state_hmask; i >= 0; i--)
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xfrm_hash_transfer(xfrm_state_bydst+i, ndst, nsrc, nspi,
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nhashmask);
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odst = xfrm_state_bydst;
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osrc = xfrm_state_bysrc;
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ospi = xfrm_state_byspi;
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ohashmask = xfrm_state_hmask;
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xfrm_state_bydst = ndst;
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xfrm_state_bysrc = nsrc;
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xfrm_state_byspi = nspi;
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xfrm_state_hmask = nhashmask;
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spin_unlock_bh(&xfrm_state_lock);
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osize = (ohashmask + 1) * sizeof(struct hlist_head);
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xfrm_state_hash_free(odst, osize);
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xfrm_state_hash_free(osrc, osize);
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xfrm_state_hash_free(ospi, osize);
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out_unlock:
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mutex_unlock(&hash_resize_mutex);
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}
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static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize, NULL);
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DECLARE_WAIT_QUEUE_HEAD(km_waitq);
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EXPORT_SYMBOL(km_waitq);
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@ -335,6 +466,7 @@ int __xfrm_state_delete(struct xfrm_state *x)
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hlist_del(&x->byspi);
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__xfrm_state_put(x);
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}
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xfrm_state_num--;
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spin_unlock(&xfrm_state_lock);
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if (del_timer(&x->timer))
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__xfrm_state_put(x);
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@ -380,7 +512,7 @@ void xfrm_state_flush(u8 proto)
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int i;
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spin_lock_bh(&xfrm_state_lock);
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for (i = 0; i < XFRM_DST_HSIZE; i++) {
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for (i = 0; i < xfrm_state_hmask; i++) {
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struct hlist_node *entry;
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struct xfrm_state *x;
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restart:
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@ -611,7 +743,7 @@ out:
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static void __xfrm_state_insert(struct xfrm_state *x)
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{
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unsigned h = xfrm_dst_hash(&x->id.daddr, x->props.family);
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unsigned int h = xfrm_dst_hash(&x->id.daddr, x->props.family);
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hlist_add_head(&x->bydst, xfrm_state_bydst+h);
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xfrm_state_hold(x);
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@ -637,6 +769,13 @@ static void __xfrm_state_insert(struct xfrm_state *x)
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xfrm_state_hold(x);
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wake_up(&km_waitq);
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xfrm_state_num++;
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if (x->bydst.next != NULL &&
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(xfrm_state_hmask + 1) < xfrm_state_hashmax &&
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xfrm_state_num > xfrm_state_hmask)
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schedule_work(&xfrm_hash_work);
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}
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void xfrm_state_insert(struct xfrm_state *x)
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@ -984,7 +1123,7 @@ static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq)
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{
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int i;
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for (i = 0; i < XFRM_DST_HSIZE; i++) {
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for (i = 0; i <= xfrm_state_hmask; i++) {
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struct hlist_node *entry;
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struct xfrm_state *x;
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@ -1026,7 +1165,7 @@ EXPORT_SYMBOL(xfrm_get_acqseq);
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void
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xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi)
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{
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u32 h;
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unsigned int h;
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struct xfrm_state *x0;
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if (x->id.spi)
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@ -1074,7 +1213,7 @@ int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*),
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int err = 0;
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spin_lock_bh(&xfrm_state_lock);
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for (i = 0; i < XFRM_DST_HSIZE; i++) {
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for (i = 0; i <= xfrm_state_hmask; i++) {
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hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) {
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if (xfrm_id_proto_match(x->id.proto, proto))
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count++;
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@ -1085,7 +1224,7 @@ int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*),
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goto out;
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}
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for (i = 0; i < XFRM_DST_HSIZE; i++) {
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for (i = 0; i <= xfrm_state_hmask; i++) {
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hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) {
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if (!xfrm_id_proto_match(x->id.proto, proto))
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continue;
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@ -1531,13 +1670,17 @@ EXPORT_SYMBOL(xfrm_init_state);
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void __init xfrm_state_init(void)
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{
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int i;
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unsigned int sz;
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sz = sizeof(struct hlist_head) * 8;
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xfrm_state_bydst = xfrm_state_hash_alloc(sz);
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xfrm_state_bysrc = xfrm_state_hash_alloc(sz);
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xfrm_state_byspi = xfrm_state_hash_alloc(sz);
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if (!xfrm_state_bydst || !xfrm_state_bysrc || !xfrm_state_byspi)
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panic("XFRM: Cannot allocate bydst/bysrc/byspi hashes.");
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xfrm_state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
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for (i=0; i<XFRM_DST_HSIZE; i++) {
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INIT_HLIST_HEAD(&xfrm_state_bydst[i]);
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INIT_HLIST_HEAD(&xfrm_state_bysrc[i]);
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INIT_HLIST_HEAD(&xfrm_state_byspi[i]);
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}
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INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task, NULL);
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}
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