148 lines
3.9 KiB
C
148 lines
3.9 KiB
C
#ifndef __NET_FRAG_H__
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#define __NET_FRAG_H__
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#include <linux/percpu_counter.h>
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struct netns_frags {
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int nqueues;
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struct list_head lru_list;
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spinlock_t lru_lock;
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/* The percpu_counter "mem" need to be cacheline aligned.
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* mem.count must not share cacheline with other writers
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*/
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struct percpu_counter mem ____cacheline_aligned_in_smp;
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/* sysctls */
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int timeout;
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int high_thresh;
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int low_thresh;
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};
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struct inet_frag_queue {
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spinlock_t lock;
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struct timer_list timer; /* when will this queue expire? */
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struct list_head lru_list; /* lru list member */
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struct hlist_node list;
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atomic_t refcnt;
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struct sk_buff *fragments; /* list of received fragments */
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struct sk_buff *fragments_tail;
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ktime_t stamp;
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int len; /* total length of orig datagram */
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int meat;
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__u8 last_in; /* first/last segment arrived? */
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#define INET_FRAG_COMPLETE 4
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#define INET_FRAG_FIRST_IN 2
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#define INET_FRAG_LAST_IN 1
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u16 max_size;
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struct netns_frags *net;
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};
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#define INETFRAGS_HASHSZ 64
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struct inet_frags {
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struct hlist_head hash[INETFRAGS_HASHSZ];
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/* This rwlock is a global lock (seperate per IPv4, IPv6 and
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* netfilter). Important to keep this on a seperate cacheline.
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*/
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rwlock_t lock ____cacheline_aligned_in_smp;
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int secret_interval;
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struct timer_list secret_timer;
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u32 rnd;
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int qsize;
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unsigned int (*hashfn)(struct inet_frag_queue *);
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bool (*match)(struct inet_frag_queue *q, void *arg);
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void (*constructor)(struct inet_frag_queue *q,
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void *arg);
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void (*destructor)(struct inet_frag_queue *);
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void (*skb_free)(struct sk_buff *);
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void (*frag_expire)(unsigned long data);
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};
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void inet_frags_init(struct inet_frags *);
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void inet_frags_fini(struct inet_frags *);
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void inet_frags_init_net(struct netns_frags *nf);
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void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f);
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void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
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void inet_frag_destroy(struct inet_frag_queue *q,
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struct inet_frags *f, int *work);
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int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f, bool force);
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struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
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struct inet_frags *f, void *key, unsigned int hash)
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__releases(&f->lock);
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static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f)
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{
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if (atomic_dec_and_test(&q->refcnt))
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inet_frag_destroy(q, f, NULL);
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}
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/* Memory Tracking Functions. */
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/* The default percpu_counter batch size is not big enough to scale to
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* fragmentation mem acct sizes.
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* The mem size of a 64K fragment is approx:
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* (44 fragments * 2944 truesize) + frag_queue struct(200) = 129736 bytes
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*/
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static unsigned int frag_percpu_counter_batch = 130000;
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static inline int frag_mem_limit(struct netns_frags *nf)
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{
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return percpu_counter_read(&nf->mem);
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}
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static inline void sub_frag_mem_limit(struct inet_frag_queue *q, int i)
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{
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__percpu_counter_add(&q->net->mem, -i, frag_percpu_counter_batch);
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}
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static inline void add_frag_mem_limit(struct inet_frag_queue *q, int i)
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{
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__percpu_counter_add(&q->net->mem, i, frag_percpu_counter_batch);
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}
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static inline void init_frag_mem_limit(struct netns_frags *nf)
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{
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percpu_counter_init(&nf->mem, 0);
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}
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static inline int sum_frag_mem_limit(struct netns_frags *nf)
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{
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int res;
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local_bh_disable();
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res = percpu_counter_sum_positive(&nf->mem);
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local_bh_enable();
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return res;
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}
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static inline void inet_frag_lru_move(struct inet_frag_queue *q)
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{
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spin_lock(&q->net->lru_lock);
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list_move_tail(&q->lru_list, &q->net->lru_list);
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spin_unlock(&q->net->lru_lock);
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}
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static inline void inet_frag_lru_del(struct inet_frag_queue *q)
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{
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spin_lock(&q->net->lru_lock);
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list_del(&q->lru_list);
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spin_unlock(&q->net->lru_lock);
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}
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static inline void inet_frag_lru_add(struct netns_frags *nf,
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struct inet_frag_queue *q)
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{
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spin_lock(&nf->lru_lock);
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list_add_tail(&q->lru_list, &nf->lru_list);
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spin_unlock(&nf->lru_lock);
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}
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#endif
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