From e7c8a41e817f381ac5c2a59ecc81b483bd68a7df Mon Sep 17 00:00:00 2001 From: Yasuyuki Kozakai Date: Wed, 16 Nov 2005 12:55:37 -0800 Subject: [PATCH] [IPV4,IPV6]: replace handmade list with hlist in IPv{4,6} reassembly Both of ipq and frag_queue have *next and **prev, and they can be replaced with hlist. Thanks Arnaldo Carvalho de Melo for the suggestion. Signed-off-by: Yasuyuki Kozakai Acked-by: YOSHIFUJI Hideaki Signed-off-by: David S. Miller --- net/ipv4/ip_fragment.c | 40 ++++++++++++++-------------------------- net/ipv6/reassembly.c | 41 ++++++++++++++++------------------------- 2 files changed, 30 insertions(+), 51 deletions(-) diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c index e7d26d9943..8ce0ce2ee4 100644 --- a/net/ipv4/ip_fragment.c +++ b/net/ipv4/ip_fragment.c @@ -71,7 +71,7 @@ struct ipfrag_skb_cb /* Describe an entry in the "incomplete datagrams" queue. */ struct ipq { - struct ipq *next; /* linked list pointers */ + struct hlist_node list; struct list_head lru_list; /* lru list member */ u32 user; u32 saddr; @@ -89,7 +89,6 @@ struct ipq { spinlock_t lock; atomic_t refcnt; struct timer_list timer; /* when will this queue expire? */ - struct ipq **pprev; int iif; struct timeval stamp; }; @@ -99,7 +98,7 @@ struct ipq { #define IPQ_HASHSZ 64 /* Per-bucket lock is easy to add now. */ -static struct ipq *ipq_hash[IPQ_HASHSZ]; +static struct hlist_head ipq_hash[IPQ_HASHSZ]; static DEFINE_RWLOCK(ipfrag_lock); static u32 ipfrag_hash_rnd; static LIST_HEAD(ipq_lru_list); @@ -107,9 +106,7 @@ int ip_frag_nqueues = 0; static __inline__ void __ipq_unlink(struct ipq *qp) { - if(qp->next) - qp->next->pprev = qp->pprev; - *qp->pprev = qp->next; + hlist_del(&qp->list); list_del(&qp->lru_list); ip_frag_nqueues--; } @@ -139,27 +136,18 @@ static void ipfrag_secret_rebuild(unsigned long dummy) get_random_bytes(&ipfrag_hash_rnd, sizeof(u32)); for (i = 0; i < IPQ_HASHSZ; i++) { struct ipq *q; + struct hlist_node *p, *n; - q = ipq_hash[i]; - while (q) { - struct ipq *next = q->next; + hlist_for_each_entry_safe(q, p, n, &ipq_hash[i], list) { unsigned int hval = ipqhashfn(q->id, q->saddr, q->daddr, q->protocol); if (hval != i) { - /* Unlink. */ - if (q->next) - q->next->pprev = q->pprev; - *q->pprev = q->next; + hlist_del(&q->list); /* Relink to new hash chain. */ - if ((q->next = ipq_hash[hval]) != NULL) - q->next->pprev = &q->next; - ipq_hash[hval] = q; - q->pprev = &ipq_hash[hval]; + hlist_add_head(&q->list, &ipq_hash[hval]); } - - q = next; } } write_unlock(&ipfrag_lock); @@ -310,14 +298,16 @@ out: static struct ipq *ip_frag_intern(unsigned int hash, struct ipq *qp_in) { struct ipq *qp; - +#ifdef CONFIG_SMP + struct hlist_node *n; +#endif write_lock(&ipfrag_lock); #ifdef CONFIG_SMP /* With SMP race we have to recheck hash table, because * such entry could be created on other cpu, while we * promoted read lock to write lock. */ - for(qp = ipq_hash[hash]; qp; qp = qp->next) { + hlist_for_each_entry(qp, n, &ipq_hash[hash], list) { if(qp->id == qp_in->id && qp->saddr == qp_in->saddr && qp->daddr == qp_in->daddr && @@ -337,10 +327,7 @@ static struct ipq *ip_frag_intern(unsigned int hash, struct ipq *qp_in) atomic_inc(&qp->refcnt); atomic_inc(&qp->refcnt); - if((qp->next = ipq_hash[hash]) != NULL) - qp->next->pprev = &qp->next; - ipq_hash[hash] = qp; - qp->pprev = &ipq_hash[hash]; + hlist_add_head(&qp->list, &ipq_hash[hash]); INIT_LIST_HEAD(&qp->lru_list); list_add_tail(&qp->lru_list, &ipq_lru_list); ip_frag_nqueues++; @@ -392,9 +379,10 @@ static inline struct ipq *ip_find(struct iphdr *iph, u32 user) __u8 protocol = iph->protocol; unsigned int hash = ipqhashfn(id, saddr, daddr, protocol); struct ipq *qp; + struct hlist_node *n; read_lock(&ipfrag_lock); - for(qp = ipq_hash[hash]; qp; qp = qp->next) { + hlist_for_each_entry(qp, n, &ipq_hash[hash], list) { if(qp->id == id && qp->saddr == saddr && qp->daddr == daddr && diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c index e4fe9ee484..5d316cb72e 100644 --- a/net/ipv6/reassembly.c +++ b/net/ipv6/reassembly.c @@ -74,7 +74,7 @@ struct ip6frag_skb_cb struct frag_queue { - struct frag_queue *next; + struct hlist_node list; struct list_head lru_list; /* lru list member */ __u32 id; /* fragment id */ @@ -95,14 +95,13 @@ struct frag_queue #define FIRST_IN 2 #define LAST_IN 1 __u16 nhoffset; - struct frag_queue **pprev; }; /* Hash table. */ #define IP6Q_HASHSZ 64 -static struct frag_queue *ip6_frag_hash[IP6Q_HASHSZ]; +static struct hlist_head ip6_frag_hash[IP6Q_HASHSZ]; static DEFINE_RWLOCK(ip6_frag_lock); static u32 ip6_frag_hash_rnd; static LIST_HEAD(ip6_frag_lru_list); @@ -110,9 +109,7 @@ int ip6_frag_nqueues = 0; static __inline__ void __fq_unlink(struct frag_queue *fq) { - if(fq->next) - fq->next->pprev = fq->pprev; - *fq->pprev = fq->next; + hlist_del(&fq->list); list_del(&fq->lru_list); ip6_frag_nqueues--; } @@ -163,28 +160,21 @@ static void ip6_frag_secret_rebuild(unsigned long dummy) get_random_bytes(&ip6_frag_hash_rnd, sizeof(u32)); for (i = 0; i < IP6Q_HASHSZ; i++) { struct frag_queue *q; + struct hlist_node *p, *n; - q = ip6_frag_hash[i]; - while (q) { - struct frag_queue *next = q->next; + hlist_for_each_entry_safe(q, p, n, &ip6_frag_hash[i], list) { unsigned int hval = ip6qhashfn(q->id, &q->saddr, &q->daddr); if (hval != i) { - /* Unlink. */ - if (q->next) - q->next->pprev = q->pprev; - *q->pprev = q->next; + hlist_del(&q->list); /* Relink to new hash chain. */ - if ((q->next = ip6_frag_hash[hval]) != NULL) - q->next->pprev = &q->next; - ip6_frag_hash[hval] = q; - q->pprev = &ip6_frag_hash[hval]; - } + hlist_add_head(&q->list, + &ip6_frag_hash[hval]); - q = next; + } } } write_unlock(&ip6_frag_lock); @@ -337,10 +327,13 @@ static struct frag_queue *ip6_frag_intern(unsigned int hash, struct frag_queue *fq_in) { struct frag_queue *fq; +#ifdef CONFIG_SMP + struct hlist_node *n; +#endif write_lock(&ip6_frag_lock); #ifdef CONFIG_SMP - for (fq = ip6_frag_hash[hash]; fq; fq = fq->next) { + hlist_for_each_entry(fq, n, &ip6_frag_hash[hash], list) { if (fq->id == fq_in->id && ipv6_addr_equal(&fq_in->saddr, &fq->saddr) && ipv6_addr_equal(&fq_in->daddr, &fq->daddr)) { @@ -358,10 +351,7 @@ static struct frag_queue *ip6_frag_intern(unsigned int hash, atomic_inc(&fq->refcnt); atomic_inc(&fq->refcnt); - if((fq->next = ip6_frag_hash[hash]) != NULL) - fq->next->pprev = &fq->next; - ip6_frag_hash[hash] = fq; - fq->pprev = &ip6_frag_hash[hash]; + hlist_add_head(&fq->list, &ip6_frag_hash[hash]); INIT_LIST_HEAD(&fq->lru_list); list_add_tail(&fq->lru_list, &ip6_frag_lru_list); ip6_frag_nqueues++; @@ -401,10 +391,11 @@ static __inline__ struct frag_queue * fq_find(u32 id, struct in6_addr *src, struct in6_addr *dst) { struct frag_queue *fq; + struct hlist_node *n; unsigned int hash = ip6qhashfn(id, src, dst); read_lock(&ip6_frag_lock); - for(fq = ip6_frag_hash[hash]; fq; fq = fq->next) { + hlist_for_each_entry(fq, n, &ip6_frag_hash[hash], list) { if (fq->id == id && ipv6_addr_equal(src, &fq->saddr) && ipv6_addr_equal(dst, &fq->daddr)) { -- 2.39.5