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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [net/] [core/] [flow.c] - Blame information for rev 3

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/* flow.c: Generic flow cache.
 *
 * Copyright (C) 2003 Alexey N. Kuznetsov (kuznet@ms2.inr.ac.ru)
 * Copyright (C) 2003 David S. Miller (davem@redhat.com)
 */
 
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/jhash.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/random.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/completion.h>
#include <linux/percpu.h>
#include <linux/bitops.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/mutex.h>
#include <net/flow.h>
#include <asm/atomic.h>
#include <asm/semaphore.h>
#include <linux/security.h>
 
struct flow_cache_entry {
        struct flow_cache_entry *next;
        u16                     family;
        u8                      dir;
        struct flowi            key;
        u32                     genid;
        void                    *object;
        atomic_t                *object_ref;
};
 
atomic_t flow_cache_genid = ATOMIC_INIT(0);
 
static u32 flow_hash_shift;
#define flow_hash_size  (1 << flow_hash_shift)
static DEFINE_PER_CPU(struct flow_cache_entry **, flow_tables) = { NULL };
 
#define flow_table(cpu) (per_cpu(flow_tables, cpu))
 
static struct kmem_cache *flow_cachep __read_mostly;
 
static int flow_lwm, flow_hwm;
 
struct flow_percpu_info {
        int hash_rnd_recalc;
        u32 hash_rnd;
        int count;
} ____cacheline_aligned;
static DEFINE_PER_CPU(struct flow_percpu_info, flow_hash_info) = { 0 };
 
#define flow_hash_rnd_recalc(cpu) \
        (per_cpu(flow_hash_info, cpu).hash_rnd_recalc)
#define flow_hash_rnd(cpu) \
        (per_cpu(flow_hash_info, cpu).hash_rnd)
#define flow_count(cpu) \
        (per_cpu(flow_hash_info, cpu).count)
 
static struct timer_list flow_hash_rnd_timer;
 
#define FLOW_HASH_RND_PERIOD    (10 * 60 * HZ)
 
struct flow_flush_info {
        atomic_t cpuleft;
        struct completion completion;
};
static DEFINE_PER_CPU(struct tasklet_struct, flow_flush_tasklets) = { NULL };
 
#define flow_flush_tasklet(cpu) (&per_cpu(flow_flush_tasklets, cpu))
 
static void flow_cache_new_hashrnd(unsigned long arg)
{
        int i;
 
        for_each_possible_cpu(i)
                flow_hash_rnd_recalc(i) = 1;
 
        flow_hash_rnd_timer.expires = jiffies + FLOW_HASH_RND_PERIOD;
        add_timer(&flow_hash_rnd_timer);
}
 
static void flow_entry_kill(int cpu, struct flow_cache_entry *fle)
{
        if (fle->object)
                atomic_dec(fle->object_ref);
        kmem_cache_free(flow_cachep, fle);
        flow_count(cpu)--;
}
 
static void __flow_cache_shrink(int cpu, int shrink_to)
{
        struct flow_cache_entry *fle, **flp;
        int i;
 
        for (i = 0; i < flow_hash_size; i++) {
                int k = 0;
 
                flp = &flow_table(cpu)[i];
                while ((fle = *flp) != NULL && k < shrink_to) {
                        k++;
                        flp = &fle->next;
                }
                while ((fle = *flp) != NULL) {
                        *flp = fle->next;
                        flow_entry_kill(cpu, fle);
                }
        }
}
 
static void flow_cache_shrink(int cpu)
{
        int shrink_to = flow_lwm / flow_hash_size;
 
        __flow_cache_shrink(cpu, shrink_to);
}
 
static void flow_new_hash_rnd(int cpu)
{
        get_random_bytes(&flow_hash_rnd(cpu), sizeof(u32));
        flow_hash_rnd_recalc(cpu) = 0;
 
        __flow_cache_shrink(cpu, 0);
}
 
static u32 flow_hash_code(struct flowi *key, int cpu)
{
        u32 *k = (u32 *) key;
 
        return (jhash2(k, (sizeof(*key) / sizeof(u32)), flow_hash_rnd(cpu)) &
                (flow_hash_size - 1));
}
 
#if (BITS_PER_LONG == 64)
typedef u64 flow_compare_t;
#else
typedef u32 flow_compare_t;
#endif
 
/* I hear what you're saying, use memcmp.  But memcmp cannot make
 * important assumptions that we can here, such as alignment and
 * constant size.
 */
static int flow_key_compare(struct flowi *key1, struct flowi *key2)
{
        flow_compare_t *k1, *k1_lim, *k2;
        const int n_elem = sizeof(struct flowi) / sizeof(flow_compare_t);
 
        BUILD_BUG_ON(sizeof(struct flowi) % sizeof(flow_compare_t));
 
        k1 = (flow_compare_t *) key1;
        k1_lim = k1 + n_elem;
 
        k2 = (flow_compare_t *) key2;
 
        do {
                if (*k1++ != *k2++)
                        return 1;
        } while (k1 < k1_lim);
 
        return 0;
}
 
void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
                        flow_resolve_t resolver)
{
        struct flow_cache_entry *fle, **head;
        unsigned int hash;
        int cpu;
 
        local_bh_disable();
        cpu = smp_processor_id();
 
        fle = NULL;
        /* Packet really early in init?  Making flow_cache_init a
         * pre-smp initcall would solve this.  --RR */
        if (!flow_table(cpu))
                goto nocache;
 
        if (flow_hash_rnd_recalc(cpu))
                flow_new_hash_rnd(cpu);
        hash = flow_hash_code(key, cpu);
 
        head = &flow_table(cpu)[hash];
        for (fle = *head; fle; fle = fle->next) {
                if (fle->family == family &&
                    fle->dir == dir &&
                    flow_key_compare(key, &fle->key) == 0) {
                        if (fle->genid == atomic_read(&flow_cache_genid)) {
                                void *ret = fle->object;
 
                                if (ret)
                                        atomic_inc(fle->object_ref);
                                local_bh_enable();
 
                                return ret;
                        }
                        break;
                }
        }
 
        if (!fle) {
                if (flow_count(cpu) > flow_hwm)
                        flow_cache_shrink(cpu);
 
                fle = kmem_cache_alloc(flow_cachep, GFP_ATOMIC);
                if (fle) {
                        fle->next = *head;
                        *head = fle;
                        fle->family = family;
                        fle->dir = dir;
                        memcpy(&fle->key, key, sizeof(*key));
                        fle->object = NULL;
                        flow_count(cpu)++;
                }
        }
 
nocache:
        {
                int err;
                void *obj;
                atomic_t *obj_ref;
 
                err = resolver(key, family, dir, &obj, &obj_ref);
 
                if (fle && !err) {
                        fle->genid = atomic_read(&flow_cache_genid);
 
                        if (fle->object)
                                atomic_dec(fle->object_ref);
 
                        fle->object = obj;
                        fle->object_ref = obj_ref;
                        if (obj)
                                atomic_inc(fle->object_ref);
                }
                local_bh_enable();
 
                if (err)
                        obj = ERR_PTR(err);
                return obj;
        }
}
 
static void flow_cache_flush_tasklet(unsigned long data)
{
        struct flow_flush_info *info = (void *)data;
        int i;
        int cpu;
 
        cpu = smp_processor_id();
        for (i = 0; i < flow_hash_size; i++) {
                struct flow_cache_entry *fle;
 
                fle = flow_table(cpu)[i];
                for (; fle; fle = fle->next) {
                        unsigned genid = atomic_read(&flow_cache_genid);
 
                        if (!fle->object || fle->genid == genid)
                                continue;
 
                        fle->object = NULL;
                        atomic_dec(fle->object_ref);
                }
        }
 
        if (atomic_dec_and_test(&info->cpuleft))
                complete(&info->completion);
}
 
static void flow_cache_flush_per_cpu(void *) __attribute__((__unused__));
static void flow_cache_flush_per_cpu(void *data)
{
        struct flow_flush_info *info = data;
        int cpu;
        struct tasklet_struct *tasklet;
 
        cpu = smp_processor_id();
 
        tasklet = flow_flush_tasklet(cpu);
        tasklet->data = (unsigned long)info;
        tasklet_schedule(tasklet);
}
 
void flow_cache_flush(void)
{
        struct flow_flush_info info;
        static DEFINE_MUTEX(flow_flush_sem);
 
        /* Don't want cpus going down or up during this. */
        lock_cpu_hotplug();
        mutex_lock(&flow_flush_sem);
        atomic_set(&info.cpuleft, num_online_cpus());
        init_completion(&info.completion);
 
        local_bh_disable();
        smp_call_function(flow_cache_flush_per_cpu, &info, 1, 0);
        flow_cache_flush_tasklet((unsigned long)&info);
        local_bh_enable();
 
        wait_for_completion(&info.completion);
        mutex_unlock(&flow_flush_sem);
        unlock_cpu_hotplug();
}
 
static void __devinit flow_cache_cpu_prepare(int cpu)
{
        struct tasklet_struct *tasklet;
        unsigned long order;
 
        for (order = 0;
             (PAGE_SIZE << order) <
                     (sizeof(struct flow_cache_entry *)*flow_hash_size);
             order++)
                /* NOTHING */;
 
        flow_table(cpu) = (struct flow_cache_entry **)
                __get_free_pages(GFP_KERNEL|__GFP_ZERO, order);
        if (!flow_table(cpu))
                panic("NET: failed to allocate flow cache order %lu\n", order);
 
        flow_hash_rnd_recalc(cpu) = 1;
        flow_count(cpu) = 0;
 
        tasklet = flow_flush_tasklet(cpu);
        tasklet_init(tasklet, flow_cache_flush_tasklet, 0);
}
 
static int flow_cache_cpu(struct notifier_block *nfb,
                          unsigned long action,
                          void *hcpu)
{
        if (action == CPU_DEAD || action == CPU_DEAD_FROZEN)
                __flow_cache_shrink((unsigned long)hcpu, 0);
        return NOTIFY_OK;
}
 
static int __init flow_cache_init(void)
{
        int i;
 
        flow_cachep = kmem_cache_create("flow_cache",
                                        sizeof(struct flow_cache_entry),
                                        0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
                                        NULL);
        flow_hash_shift = 10;
        flow_lwm = 2 * flow_hash_size;
        flow_hwm = 4 * flow_hash_size;
 
        init_timer(&flow_hash_rnd_timer);
        flow_hash_rnd_timer.function = flow_cache_new_hashrnd;
        flow_hash_rnd_timer.expires = jiffies + FLOW_HASH_RND_PERIOD;
        add_timer(&flow_hash_rnd_timer);
 
        for_each_possible_cpu(i)
                flow_cache_cpu_prepare(i);
 
        hotcpu_notifier(flow_cache_cpu, 0);
        return 0;
}
 
module_init(flow_cache_init);
 
EXPORT_SYMBOL(flow_cache_genid);
EXPORT_SYMBOL(flow_cache_lookup);

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Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [net/] [core/] [flow.c] - Blame information for rev 3

Line No.	Rev	Author	Line
1	3	xianfeng	`/* flow.c: Generic flow cache.`
2			`*`
3			`* Copyright (C) 2003 Alexey N. Kuznetsov (kuznet@ms2.inr.ac.ru)`
4			`* Copyright (C) 2003 David S. Miller (davem@redhat.com)`
5			`*/`
6
7			`#include <linux/kernel.h>`
8			`#include <linux/module.h>`
9			`#include <linux/list.h>`
10			`#include <linux/jhash.h>`
11			`#include <linux/interrupt.h>`
12			`#include <linux/mm.h>`
13			`#include <linux/random.h>`
14			`#include <linux/init.h>`
15			`#include <linux/slab.h>`
16			`#include <linux/smp.h>`
17			`#include <linux/completion.h>`
18			`#include <linux/percpu.h>`
19			`#include <linux/bitops.h>`
20			`#include <linux/notifier.h>`
21			`#include <linux/cpu.h>`
22			`#include <linux/cpumask.h>`
23			`#include <linux/mutex.h>`
24			`#include <net/flow.h>`
25			`#include <asm/atomic.h>`
26			`#include <asm/semaphore.h>`
27			`#include <linux/security.h>`
28
29			`struct flow_cache_entry {`
30			`struct flow_cache_entry *next;`
31			`u16 family;`
32			`u8 dir;`
33			`struct flowi key;`
34			`u32 genid;`
35			`void *object;`
36			`atomic_t *object_ref;`
37			`};`
38
39			`atomic_t flow_cache_genid = ATOMIC_INIT(0);`
40
41			`static u32 flow_hash_shift;`
42			`#define flow_hash_size (1 << flow_hash_shift)`
43			`static DEFINE_PER_CPU(struct flow_cache_entry **, flow_tables) = { NULL };`
44
45			`#define flow_table(cpu) (per_cpu(flow_tables, cpu))`
46
47			`static struct kmem_cache *flow_cachep __read_mostly;`
48
49			`static int flow_lwm, flow_hwm;`
50
51			`struct flow_percpu_info {`
52			`int hash_rnd_recalc;`
53			`u32 hash_rnd;`
54			`int count;`
55			`} ____cacheline_aligned;`
56			`static DEFINE_PER_CPU(struct flow_percpu_info, flow_hash_info) = { 0 };`
57
58			`#define flow_hash_rnd_recalc(cpu) \`
59			`(per_cpu(flow_hash_info, cpu).hash_rnd_recalc)`
60			`#define flow_hash_rnd(cpu) \`
61			`(per_cpu(flow_hash_info, cpu).hash_rnd)`
62			`#define flow_count(cpu) \`
63			`(per_cpu(flow_hash_info, cpu).count)`
64
65			`static struct timer_list flow_hash_rnd_timer;`
66
67			`#define FLOW_HASH_RND_PERIOD (10 * 60 * HZ)`
68
69			`struct flow_flush_info {`
70			`atomic_t cpuleft;`
71			`struct completion completion;`
72			`};`
73			`static DEFINE_PER_CPU(struct tasklet_struct, flow_flush_tasklets) = { NULL };`
74
75			`#define flow_flush_tasklet(cpu) (&per_cpu(flow_flush_tasklets, cpu))`
76
77			`static void flow_cache_new_hashrnd(unsigned long arg)`
78			`{`
79			`int i;`
80
81			`for_each_possible_cpu(i)`
82			`flow_hash_rnd_recalc(i) = 1;`
83
84			`flow_hash_rnd_timer.expires = jiffies + FLOW_HASH_RND_PERIOD;`
85			`add_timer(&flow_hash_rnd_timer);`
86			`}`
87
88			`static void flow_entry_kill(int cpu, struct flow_cache_entry *fle)`
89			`{`
90			`if (fle->object)`
91			`atomic_dec(fle->object_ref);`
92			`kmem_cache_free(flow_cachep, fle);`
93			`flow_count(cpu)--;`
94			`}`
95
96			`static void __flow_cache_shrink(int cpu, int shrink_to)`
97			`{`
98			`struct flow_cache_entry fle, *flp;`
99			`int i;`
100
101			`for (i = 0; i < flow_hash_size; i++) {`
102			`int k = 0;`
103
104			`flp = &flow_table(cpu)[i];`
105			`while ((fle = *flp) != NULL && k < shrink_to) {`
106			`k++;`
107			`flp = &fle->next;`
108			`}`
109			`while ((fle = *flp) != NULL) {`
110			`*flp = fle->next;`
111			`flow_entry_kill(cpu, fle);`
112			`}`
113			`}`
114			`}`
115
116			`static void flow_cache_shrink(int cpu)`
117			`{`
118			`int shrink_to = flow_lwm / flow_hash_size;`
119
120			`__flow_cache_shrink(cpu, shrink_to);`
121			`}`
122
123			`static void flow_new_hash_rnd(int cpu)`
124			`{`
125			`get_random_bytes(&flow_hash_rnd(cpu), sizeof(u32));`
126			`flow_hash_rnd_recalc(cpu) = 0;`
127
128			`__flow_cache_shrink(cpu, 0);`
129			`}`
130
131			`static u32 flow_hash_code(struct flowi *key, int cpu)`
132			`{`
133			`u32 k = (u32 ) key;`
134
135			`return (jhash2(k, (sizeof(*key) / sizeof(u32)), flow_hash_rnd(cpu)) &`
136			`(flow_hash_size - 1));`
137			`}`
138
139			`#if (BITS_PER_LONG == 64)`
140			`typedef u64 flow_compare_t;`
141			`#else`
142			`typedef u32 flow_compare_t;`
143			`#endif`
144
145			`/* I hear what you're saying, use memcmp. But memcmp cannot make`
146			`* important assumptions that we can here, such as alignment and`
147			`* constant size.`
148			`*/`
149			`static int flow_key_compare(struct flowi key1, struct flowi key2)`
150			`{`
151			`flow_compare_t k1, k1_lim, *k2;`
152			`const int n_elem = sizeof(struct flowi) / sizeof(flow_compare_t);`
153
154			`BUILD_BUG_ON(sizeof(struct flowi) % sizeof(flow_compare_t));`
155
156			`k1 = (flow_compare_t *) key1;`
157			`k1_lim = k1 + n_elem;`
158
159			`k2 = (flow_compare_t *) key2;`
160
161			`do {`
162			`if (k1++ != k2++)`
163			`return 1;`
164			`} while (k1 < k1_lim);`
165
166			`return 0;`
167			`}`
168
169			`void flow_cache_lookup(struct flowi key, u16 family, u8 dir,`
170			`flow_resolve_t resolver)`
171			`{`
172			`struct flow_cache_entry fle, *head;`
173			`unsigned int hash;`
174			`int cpu;`
175
176			`local_bh_disable();`
177			`cpu = smp_processor_id();`
178
179			`fle = NULL;`
180			`/* Packet really early in init? Making flow_cache_init a`
181			`* pre-smp initcall would solve this. --RR */`
182			`if (!flow_table(cpu))`
183			`goto nocache;`
184
185			`if (flow_hash_rnd_recalc(cpu))`
186			`flow_new_hash_rnd(cpu);`
187			`hash = flow_hash_code(key, cpu);`
188
189			`head = &flow_table(cpu)[hash];`
190			`for (fle = *head; fle; fle = fle->next) {`
191			`if (fle->family == family &&`
192			`fle->dir == dir &&`
193			`flow_key_compare(key, &fle->key) == 0) {`
194			`if (fle->genid == atomic_read(&flow_cache_genid)) {`
195			`void *ret = fle->object;`
196
197			`if (ret)`
198			`atomic_inc(fle->object_ref);`
199			`local_bh_enable();`
200
201			`return ret;`
202			`}`
203			`break;`
204			`}`
205			`}`
206
207			`if (!fle) {`
208			`if (flow_count(cpu) > flow_hwm)`
209			`flow_cache_shrink(cpu);`
210
211			`fle = kmem_cache_alloc(flow_cachep, GFP_ATOMIC);`
212			`if (fle) {`
213			`fle->next = *head;`
214			`*head = fle;`
215			`fle->family = family;`
216			`fle->dir = dir;`
217			`memcpy(&fle->key, key, sizeof(*key));`
218			`fle->object = NULL;`
219			`flow_count(cpu)++;`
220			`}`
221			`}`
222
223			`nocache:`
224			`{`
225			`int err;`
226			`void *obj;`
227			`atomic_t *obj_ref;`
228
229			`err = resolver(key, family, dir, &obj, &obj_ref);`
230
231			`if (fle && !err) {`
232			`fle->genid = atomic_read(&flow_cache_genid);`
233
234			`if (fle->object)`
235			`atomic_dec(fle->object_ref);`
236
237			`fle->object = obj;`
238			`fle->object_ref = obj_ref;`
239			`if (obj)`
240			`atomic_inc(fle->object_ref);`
241			`}`
242			`local_bh_enable();`
243
244			`if (err)`
245			`obj = ERR_PTR(err);`
246			`return obj;`
247			`}`
248			`}`
249
250			`static void flow_cache_flush_tasklet(unsigned long data)`
251			`{`
252			`struct flow_flush_info info = (void )data;`
253			`int i;`
254			`int cpu;`
255
256			`cpu = smp_processor_id();`
257			`for (i = 0; i < flow_hash_size; i++) {`
258			`struct flow_cache_entry *fle;`
259
260			`fle = flow_table(cpu)[i];`
261			`for (; fle; fle = fle->next) {`
262			`unsigned genid = atomic_read(&flow_cache_genid);`
263
264			`if (!fle->object \|\| fle->genid == genid)`
265			`continue;`
266
267			`fle->object = NULL;`
268			`atomic_dec(fle->object_ref);`
269			`}`
270			`}`
271
272			`if (atomic_dec_and_test(&info->cpuleft))`
273			`complete(&info->completion);`
274			`}`
275
276			`static void flow_cache_flush_per_cpu(void *) __attribute__((__unused__));`
277			`static void flow_cache_flush_per_cpu(void *data)`
278			`{`
279			`struct flow_flush_info *info = data;`
280			`int cpu;`
281			`struct tasklet_struct *tasklet;`
282
283			`cpu = smp_processor_id();`
284
285			`tasklet = flow_flush_tasklet(cpu);`
286			`tasklet->data = (unsigned long)info;`
287			`tasklet_schedule(tasklet);`
288			`}`
289
290			`void flow_cache_flush(void)`
291			`{`
292			`struct flow_flush_info info;`
293			`static DEFINE_MUTEX(flow_flush_sem);`
294
295			`/* Don't want cpus going down or up during this. */`
296			`lock_cpu_hotplug();`
297			`mutex_lock(&flow_flush_sem);`
298			`atomic_set(&info.cpuleft, num_online_cpus());`
299			`init_completion(&info.completion);`
300
301			`local_bh_disable();`
302			`smp_call_function(flow_cache_flush_per_cpu, &info, 1, 0);`
303			`flow_cache_flush_tasklet((unsigned long)&info);`
304			`local_bh_enable();`
305
306			`wait_for_completion(&info.completion);`
307			`mutex_unlock(&flow_flush_sem);`
308			`unlock_cpu_hotplug();`
309			`}`
310
311			`static void __devinit flow_cache_cpu_prepare(int cpu)`
312			`{`
313			`struct tasklet_struct *tasklet;`
314			`unsigned long order;`
315
316			`for (order = 0;`
317			`(PAGE_SIZE << order) <`
318			`(sizeof(struct flow_cache_entry )flow_hash_size);`
319			`order++)`
320			`/* NOTHING */;`
321
322			`flow_table(cpu) = (struct flow_cache_entry **)`
323			`__get_free_pages(GFP_KERNEL\|__GFP_ZERO, order);`
324			`if (!flow_table(cpu))`
325			`panic("NET: failed to allocate flow cache order %lu\n", order);`
326
327			`flow_hash_rnd_recalc(cpu) = 1;`
328			`flow_count(cpu) = 0;`
329
330			`tasklet = flow_flush_tasklet(cpu);`
331			`tasklet_init(tasklet, flow_cache_flush_tasklet, 0);`
332			`}`
333
334			`static int flow_cache_cpu(struct notifier_block *nfb,`
335			`unsigned long action,`
336			`void *hcpu)`
337			`{`
338			`if (action == CPU_DEAD \|\| action == CPU_DEAD_FROZEN)`
339			`__flow_cache_shrink((unsigned long)hcpu, 0);`
340			`return NOTIFY_OK;`
341			`}`
342
343			`static int __init flow_cache_init(void)`
344			`{`
345			`int i;`
346
347			`flow_cachep = kmem_cache_create("flow_cache",`
348			`sizeof(struct flow_cache_entry),`
349			`0, SLAB_HWCACHE_ALIGN\|SLAB_PANIC,`
350			`NULL);`
351			`flow_hash_shift = 10;`
352			`flow_lwm = 2 * flow_hash_size;`
353			`flow_hwm = 4 * flow_hash_size;`
354
355			`init_timer(&flow_hash_rnd_timer);`
356			`flow_hash_rnd_timer.function = flow_cache_new_hashrnd;`
357			`flow_hash_rnd_timer.expires = jiffies + FLOW_HASH_RND_PERIOD;`
358			`add_timer(&flow_hash_rnd_timer);`
359
360			`for_each_possible_cpu(i)`
361			`flow_cache_cpu_prepare(i);`
362
363			`hotcpu_notifier(flow_cache_cpu, 0);`
364			`return 0;`
365			`}`
366
367			`module_init(flow_cache_init);`
368
369			`EXPORT_SYMBOL(flow_cache_genid);`
370			`EXPORT_SYMBOL(flow_cache_lookup);`