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[XFRM]: Dynamic xfrm_state hash table sizing.
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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>
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David S. Miller committed Sep 22, 2006
1 parent 8f126e3 commit f034b5d
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Showing 3 changed files with 197 additions and 54 deletions.
2 changes: 1 addition & 1 deletion include/linux/bootmem.h
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Original file line number Diff line number Diff line change
Expand Up @@ -114,7 +114,7 @@ extern void *__init alloc_large_system_hash(const char *tablename,
#else
#define HASHDIST_DEFAULT 0
#endif
extern int __initdata hashdist; /* Distribute hashes across NUMA nodes? */
extern int hashdist; /* Distribute hashes across NUMA nodes? */


#endif /* _LINUX_BOOTMEM_H */
2 changes: 1 addition & 1 deletion mm/page_alloc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2363,7 +2363,7 @@ int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write,
return 0;
}

__initdata int hashdist = HASHDIST_DEFAULT;
int hashdist = HASHDIST_DEFAULT;

#ifdef CONFIG_NUMA
static int __init set_hashdist(char *str)
Expand Down
247 changes: 195 additions & 52 deletions net/xfrm/xfrm_state.c
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,9 @@
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>
#include <linux/module.h>
#include <linux/bootmem.h>
#include <linux/vmalloc.h>
#include <linux/cache.h>
#include <asm/uaccess.h>

struct sock *xfrm_nl;
Expand All @@ -38,102 +41,230 @@ EXPORT_SYMBOL(sysctl_xfrm_aevent_rseqth);

static DEFINE_SPINLOCK(xfrm_state_lock);

#define XFRM_DST_HSIZE 1024

/* Hash table to find appropriate SA towards given target (endpoint
* of tunnel or destination of transport mode) allowed by selector.
*
* Main use is finding SA after policy selected tunnel or transport mode.
* Also, it can be used by ah/esp icmp error handler to find offending SA.
*/
static struct hlist_head xfrm_state_bydst[XFRM_DST_HSIZE];
static struct hlist_head xfrm_state_bysrc[XFRM_DST_HSIZE];
static struct hlist_head xfrm_state_byspi[XFRM_DST_HSIZE];

static __inline__
unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
static struct hlist_head *xfrm_state_bydst __read_mostly;
static struct hlist_head *xfrm_state_bysrc __read_mostly;
static struct hlist_head *xfrm_state_byspi __read_mostly;
static unsigned int xfrm_state_hmask __read_mostly;
static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
static unsigned int xfrm_state_num;

static inline unsigned int __xfrm4_dst_hash(xfrm_address_t *addr, unsigned int hmask)
{
unsigned h;
unsigned int h;
h = ntohl(addr->a4);
h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
h = (h ^ (h>>16)) & hmask;
return h;
}

static __inline__
unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
static inline unsigned int __xfrm6_dst_hash(xfrm_address_t *addr, unsigned int hmask)
{
unsigned h;
unsigned int h;
h = ntohl(addr->a6[2]^addr->a6[3]);
h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
h = (h ^ (h>>16)) & hmask;
return h;
}

static __inline__
unsigned __xfrm4_src_hash(xfrm_address_t *addr)
static inline unsigned int __xfrm4_src_hash(xfrm_address_t *addr, unsigned int hmask)
{
return __xfrm4_dst_hash(addr);
return __xfrm4_dst_hash(addr, hmask);
}

static __inline__
unsigned __xfrm6_src_hash(xfrm_address_t *addr)
static inline unsigned int __xfrm6_src_hash(xfrm_address_t *addr, unsigned int hmask)
{
return __xfrm6_dst_hash(addr);
return __xfrm6_dst_hash(addr, hmask);
}

static __inline__
unsigned xfrm_src_hash(xfrm_address_t *addr, unsigned short family)
static inline unsigned __xfrm_src_hash(xfrm_address_t *addr, unsigned short family, unsigned int hmask)
{
switch (family) {
case AF_INET:
return __xfrm4_src_hash(addr);
return __xfrm4_src_hash(addr, hmask);
case AF_INET6:
return __xfrm6_src_hash(addr);
return __xfrm6_src_hash(addr, hmask);
}
return 0;
}

static __inline__
unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
static inline unsigned xfrm_src_hash(xfrm_address_t *addr, unsigned short family)
{
return __xfrm_src_hash(addr, family, xfrm_state_hmask);
}

static inline unsigned int __xfrm_dst_hash(xfrm_address_t *addr, unsigned short family, unsigned int hmask)
{
switch (family) {
case AF_INET:
return __xfrm4_dst_hash(addr);
return __xfrm4_dst_hash(addr, hmask);
case AF_INET6:
return __xfrm6_dst_hash(addr);
return __xfrm6_dst_hash(addr, hmask);
}
return 0;
}

static __inline__
unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
static inline unsigned int xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
{
return __xfrm_dst_hash(addr, family, xfrm_state_hmask);
}

static inline unsigned int __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto,
unsigned int hmask)
{
unsigned h;
unsigned int h;
h = ntohl(addr->a4^spi^proto);
h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
h = (h ^ (h>>10) ^ (h>>20)) & hmask;
return h;
}

static __inline__
unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
static inline unsigned int __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto,
unsigned int hmask)
{
unsigned h;
unsigned int h;
h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
h = (h ^ (h>>10) ^ (h>>20)) & hmask;
return h;
}

static __inline__
unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
static inline
unsigned __xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family,
unsigned int hmask)
{
switch (family) {
case AF_INET:
return __xfrm4_spi_hash(addr, spi, proto);
return __xfrm4_spi_hash(addr, spi, proto, hmask);
case AF_INET6:
return __xfrm6_spi_hash(addr, spi, proto);
return __xfrm6_spi_hash(addr, spi, proto, hmask);
}
return 0; /*XXX*/
}

static inline unsigned int
xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
{
return __xfrm_spi_hash(addr, spi, proto, family, xfrm_state_hmask);
}

static struct hlist_head *xfrm_state_hash_alloc(unsigned int sz)
{
struct hlist_head *n;

if (sz <= PAGE_SIZE)
n = kmalloc(sz, GFP_KERNEL);
else if (hashdist)
n = __vmalloc(sz, GFP_KERNEL, PAGE_KERNEL);
else
n = (struct hlist_head *)
__get_free_pages(GFP_KERNEL, get_order(sz));

if (n)
memset(n, 0, sz);

return n;
}

static void xfrm_state_hash_free(struct hlist_head *n, unsigned int sz)
{
if (sz <= PAGE_SIZE)
kfree(n);
else if (hashdist)
vfree(n);
else
free_pages((unsigned long)n, get_order(sz));
}

static void xfrm_hash_transfer(struct hlist_head *list,
struct hlist_head *ndsttable,
struct hlist_head *nsrctable,
struct hlist_head *nspitable,
unsigned int nhashmask)
{
struct hlist_node *entry, *tmp;
struct xfrm_state *x;

hlist_for_each_entry_safe(x, entry, tmp, list, bydst) {
unsigned int h;

h = __xfrm_dst_hash(&x->id.daddr, x->props.family, nhashmask);
hlist_add_head(&x->bydst, ndsttable+h);

h = __xfrm_src_hash(&x->props.saddr, x->props.family,
nhashmask);
hlist_add_head(&x->bysrc, nsrctable+h);

h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto,
x->props.family, nhashmask);
hlist_add_head(&x->byspi, nspitable+h);
}
}

static unsigned long xfrm_hash_new_size(void)
{
return ((xfrm_state_hmask + 1) << 1) *
sizeof(struct hlist_head);
}

static DEFINE_MUTEX(hash_resize_mutex);

static void xfrm_hash_resize(void *__unused)
{
struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
unsigned long nsize, osize;
unsigned int nhashmask, ohashmask;
int i;

mutex_lock(&hash_resize_mutex);

nsize = xfrm_hash_new_size();
ndst = xfrm_state_hash_alloc(nsize);
if (!ndst)
goto out_unlock;
nsrc = xfrm_state_hash_alloc(nsize);
if (!nsrc) {
xfrm_state_hash_free(ndst, nsize);
goto out_unlock;
}
nspi = xfrm_state_hash_alloc(nsize);
if (!nspi) {
xfrm_state_hash_free(ndst, nsize);
xfrm_state_hash_free(nsrc, nsize);
goto out_unlock;
}

spin_lock_bh(&xfrm_state_lock);

nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
for (i = xfrm_state_hmask; i >= 0; i--)
xfrm_hash_transfer(xfrm_state_bydst+i, ndst, nsrc, nspi,
nhashmask);

odst = xfrm_state_bydst;
osrc = xfrm_state_bysrc;
ospi = xfrm_state_byspi;
ohashmask = xfrm_state_hmask;

xfrm_state_bydst = ndst;
xfrm_state_bysrc = nsrc;
xfrm_state_byspi = nspi;
xfrm_state_hmask = nhashmask;

spin_unlock_bh(&xfrm_state_lock);

osize = (ohashmask + 1) * sizeof(struct hlist_head);
xfrm_state_hash_free(odst, osize);
xfrm_state_hash_free(osrc, osize);
xfrm_state_hash_free(ospi, osize);

out_unlock:
mutex_unlock(&hash_resize_mutex);
}

static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize, NULL);

DECLARE_WAIT_QUEUE_HEAD(km_waitq);
EXPORT_SYMBOL(km_waitq);

Expand Down Expand Up @@ -335,6 +466,7 @@ int __xfrm_state_delete(struct xfrm_state *x)
hlist_del(&x->byspi);
__xfrm_state_put(x);
}
xfrm_state_num--;
spin_unlock(&xfrm_state_lock);
if (del_timer(&x->timer))
__xfrm_state_put(x);
Expand Down Expand Up @@ -380,7 +512,7 @@ void xfrm_state_flush(u8 proto)
int i;

spin_lock_bh(&xfrm_state_lock);
for (i = 0; i < XFRM_DST_HSIZE; i++) {
for (i = 0; i < xfrm_state_hmask; i++) {
struct hlist_node *entry;
struct xfrm_state *x;
restart:
Expand Down Expand Up @@ -611,7 +743,7 @@ xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,

static void __xfrm_state_insert(struct xfrm_state *x)
{
unsigned h = xfrm_dst_hash(&x->id.daddr, x->props.family);
unsigned int h = xfrm_dst_hash(&x->id.daddr, x->props.family);

hlist_add_head(&x->bydst, xfrm_state_bydst+h);
xfrm_state_hold(x);
Expand All @@ -637,6 +769,13 @@ static void __xfrm_state_insert(struct xfrm_state *x)
xfrm_state_hold(x);

wake_up(&km_waitq);

xfrm_state_num++;

if (x->bydst.next != NULL &&
(xfrm_state_hmask + 1) < xfrm_state_hashmax &&
xfrm_state_num > xfrm_state_hmask)
schedule_work(&xfrm_hash_work);
}

void xfrm_state_insert(struct xfrm_state *x)
Expand Down Expand Up @@ -984,7 +1123,7 @@ static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq)
{
int i;

for (i = 0; i < XFRM_DST_HSIZE; i++) {
for (i = 0; i <= xfrm_state_hmask; i++) {
struct hlist_node *entry;
struct xfrm_state *x;

Expand Down Expand Up @@ -1026,7 +1165,7 @@ EXPORT_SYMBOL(xfrm_get_acqseq);
void
xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi)
{
u32 h;
unsigned int h;
struct xfrm_state *x0;

if (x->id.spi)
Expand Down Expand Up @@ -1074,7 +1213,7 @@ int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*),
int err = 0;

spin_lock_bh(&xfrm_state_lock);
for (i = 0; i < XFRM_DST_HSIZE; i++) {
for (i = 0; i <= xfrm_state_hmask; i++) {
hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) {
if (xfrm_id_proto_match(x->id.proto, proto))
count++;
Expand All @@ -1085,7 +1224,7 @@ int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*),
goto out;
}

for (i = 0; i < XFRM_DST_HSIZE; i++) {
for (i = 0; i <= xfrm_state_hmask; i++) {
hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) {
if (!xfrm_id_proto_match(x->id.proto, proto))
continue;
Expand Down Expand Up @@ -1531,13 +1670,17 @@ EXPORT_SYMBOL(xfrm_init_state);

void __init xfrm_state_init(void)
{
int i;
unsigned int sz;

sz = sizeof(struct hlist_head) * 8;

xfrm_state_bydst = xfrm_state_hash_alloc(sz);
xfrm_state_bysrc = xfrm_state_hash_alloc(sz);
xfrm_state_byspi = xfrm_state_hash_alloc(sz);
if (!xfrm_state_bydst || !xfrm_state_bysrc || !xfrm_state_byspi)
panic("XFRM: Cannot allocate bydst/bysrc/byspi hashes.");
xfrm_state_hmask = ((sz / sizeof(struct hlist_head)) - 1);

for (i=0; i<XFRM_DST_HSIZE; i++) {
INIT_HLIST_HEAD(&xfrm_state_bydst[i]);
INIT_HLIST_HEAD(&xfrm_state_bysrc[i]);
INIT_HLIST_HEAD(&xfrm_state_byspi[i]);
}
INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task, NULL);
}

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