From 8e7999c44ee95e1e90ac91c83557a04e2948f160 Mon Sep 17 00:00:00 2001 From: Pavel Emelyanov Date: Mon, 15 Oct 2007 02:40:06 -0700 Subject: [PATCH] [INET]: Consolidate the xxx_evictor The evictors collect some statistics for ipv4 and ipv6, so make it return the number of evicted queues and account them all at once in the caller. The XXX_ADD_STATS_BH() macros are just for this case, but maybe there are places in code, that can make use of them as well. Signed-off-by: Pavel Emelyanov Signed-off-by: David S. Miller --- include/net/inet_frag.h | 1 + include/net/ip.h | 1 + include/net/ipv6.h | 9 +++++++ net/ipv4/inet_fragment.c | 32 +++++++++++++++++++++++++ net/ipv4/ip_fragment.c | 30 ++++------------------- net/ipv6/netfilter/nf_conntrack_reasm.c | 29 +--------------------- net/ipv6/reassembly.c | 30 ++++------------------- 7 files changed, 52 insertions(+), 80 deletions(-) diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h index 2dd1cd4e7f44..cf583cf7e9ef 100644 --- a/include/net/inet_frag.h +++ b/include/net/inet_frag.h @@ -49,5 +49,6 @@ void inet_frags_fini(struct inet_frags *); void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f); void inet_frag_destroy(struct inet_frag_queue *q, struct inet_frags *f, int *work); +int inet_frag_evictor(struct inet_frags *f); #endif diff --git a/include/net/ip.h b/include/net/ip.h index e6aa955e241c..840dd91b513b 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -160,6 +160,7 @@ DECLARE_SNMP_STAT(struct ipstats_mib, ip_statistics); #define IP_INC_STATS(field) SNMP_INC_STATS(ip_statistics, field) #define IP_INC_STATS_BH(field) SNMP_INC_STATS_BH(ip_statistics, field) #define IP_INC_STATS_USER(field) SNMP_INC_STATS_USER(ip_statistics, field) +#define IP_ADD_STATS_BH(field, val) SNMP_ADD_STATS_BH(ip_statistics, field, val) DECLARE_SNMP_STAT(struct linux_mib, net_statistics); #define NET_INC_STATS(field) SNMP_INC_STATS(net_statistics, field) #define NET_INC_STATS_BH(field) SNMP_INC_STATS_BH(net_statistics, field) diff --git a/include/net/ipv6.h b/include/net/ipv6.h index b29d76c715d2..a0f1042037f2 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -120,12 +120,21 @@ extern int sysctl_mld_max_msf; SNMP_INC_STATS##modifier(statname##_statistics, (field)); \ }) +#define _DEVADD(statname, modifier, idev, field, val) \ +({ \ + struct inet6_dev *_idev = (idev); \ + if (likely(_idev != NULL)) \ + SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ + SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\ +}) + /* MIBs */ DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics); #define IP6_INC_STATS(idev,field) _DEVINC(ipv6, , idev, field) #define IP6_INC_STATS_BH(idev,field) _DEVINC(ipv6, _BH, idev, field) #define IP6_INC_STATS_USER(idev,field) _DEVINC(ipv6, _USER, idev, field) +#define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val) DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics); DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics); diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c index 15fb2c4a36a7..484cf512858f 100644 --- a/net/ipv4/inet_fragment.c +++ b/net/ipv4/inet_fragment.c @@ -140,3 +140,35 @@ void inet_frag_destroy(struct inet_frag_queue *q, struct inet_frags *f, } EXPORT_SYMBOL(inet_frag_destroy); + +int inet_frag_evictor(struct inet_frags *f) +{ + struct inet_frag_queue *q; + int work, evicted = 0; + + work = atomic_read(&f->mem) - f->ctl->low_thresh; + while (work > 0) { + read_lock(&f->lock); + if (list_empty(&f->lru_list)) { + read_unlock(&f->lock); + break; + } + + q = list_first_entry(&f->lru_list, + struct inet_frag_queue, lru_list); + atomic_inc(&q->refcnt); + read_unlock(&f->lock); + + spin_lock(&q->lock); + if (!(q->last_in & COMPLETE)) + inet_frag_kill(q, f); + spin_unlock(&q->lock); + + if (atomic_dec_and_test(&q->refcnt)) + inet_frag_destroy(q, f, &work); + evicted++; + } + + return evicted; +} +EXPORT_SYMBOL(inet_frag_evictor); diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c index e8736632094a..ee6e04159627 100644 --- a/net/ipv4/ip_fragment.c +++ b/net/ipv4/ip_fragment.c @@ -174,33 +174,11 @@ static void ipq_kill(struct ipq *ipq) */ static void ip_evictor(void) { - struct ipq *qp; - struct list_head *tmp; - int work; - - work = atomic_read(&ip4_frags.mem) - ip4_frags_ctl.low_thresh; - if (work <= 0) - return; - - while (work > 0) { - read_lock(&ip4_frags.lock); - if (list_empty(&ip4_frags.lru_list)) { - read_unlock(&ip4_frags.lock); - return; - } - tmp = ip4_frags.lru_list.next; - qp = list_entry(tmp, struct ipq, q.lru_list); - atomic_inc(&qp->q.refcnt); - read_unlock(&ip4_frags.lock); + int evicted; - spin_lock(&qp->q.lock); - if (!(qp->q.last_in&COMPLETE)) - ipq_kill(qp); - spin_unlock(&qp->q.lock); - - ipq_put(qp, &work); - IP_INC_STATS_BH(IPSTATS_MIB_REASMFAILS); - } + evicted = inet_frag_evictor(&ip4_frags); + if (evicted) + IP_ADD_STATS_BH(IPSTATS_MIB_REASMFAILS, evicted); } /* diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c index 785f5cda188e..e4fbe5ba88f1 100644 --- a/net/ipv6/netfilter/nf_conntrack_reasm.c +++ b/net/ipv6/netfilter/nf_conntrack_reasm.c @@ -163,34 +163,7 @@ static __inline__ void fq_kill(struct nf_ct_frag6_queue *fq) static void nf_ct_frag6_evictor(void) { - struct nf_ct_frag6_queue *fq; - struct list_head *tmp; - unsigned int work; - - work = atomic_read(&nf_frags.mem); - if (work <= nf_frags_ctl.low_thresh) - return; - - work -= nf_frags_ctl.low_thresh; - while (work > 0) { - read_lock(&nf_frags.lock); - if (list_empty(&nf_frags.lru_list)) { - read_unlock(&nf_frags.lock); - return; - } - tmp = nf_frags.lru_list.next; - BUG_ON(tmp == NULL); - fq = list_entry(tmp, struct nf_ct_frag6_queue, q.lru_list); - atomic_inc(&fq->q.refcnt); - read_unlock(&nf_frags.lock); - - spin_lock(&fq->q.lock); - if (!(fq->q.last_in&COMPLETE)) - fq_kill(fq); - spin_unlock(&fq->q.lock); - - fq_put(fq, &work); - } + inet_frag_evictor(&nf_frags); } static void nf_ct_frag6_expire(unsigned long data) diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c index 940b7d2383ec..02e4e855b927 100644 --- a/net/ipv6/reassembly.c +++ b/net/ipv6/reassembly.c @@ -185,33 +185,11 @@ static __inline__ void fq_kill(struct frag_queue *fq) static void ip6_evictor(struct inet6_dev *idev) { - struct frag_queue *fq; - struct list_head *tmp; - int work; - - work = atomic_read(&ip6_frags.mem) - ip6_frags_ctl.low_thresh; - if (work <= 0) - return; - - while(work > 0) { - read_lock(&ip6_frags.lock); - if (list_empty(&ip6_frags.lru_list)) { - read_unlock(&ip6_frags.lock); - return; - } - tmp = ip6_frags.lru_list.next; - fq = list_entry(tmp, struct frag_queue, q.lru_list); - atomic_inc(&fq->q.refcnt); - read_unlock(&ip6_frags.lock); + int evicted; - spin_lock(&fq->q.lock); - if (!(fq->q.last_in&COMPLETE)) - fq_kill(fq); - spin_unlock(&fq->q.lock); - - fq_put(fq, &work); - IP6_INC_STATS_BH(idev, IPSTATS_MIB_REASMFAILS); - } + evicted = inet_frag_evictor(&ip6_frags); + if (evicted) + IP6_ADD_STATS_BH(idev, IPSTATS_MIB_REASMFAILS, evicted); } static void ip6_frag_expire(unsigned long data) -- 2.39.5