mirror of https://gitee.com/openkylin/linux.git
ipv6 flowlabel: Convert hash list to RCU.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki / 吉藤英明
David S. Miller
parent
f256dc59d0
commit
d3aedd5ebd
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@ -222,6 +222,7 @@ struct ip6_flowlabel {
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struct in6_addr dst;
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struct ipv6_txoptions *opt;
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unsigned long linger;
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struct rcu_head rcu;
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u8 share;
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union {
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struct pid *pid;
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@ -51,25 +51,33 @@
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#define FL_HASH(l) (ntohl(l)&FL_HASH_MASK)
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static atomic_t fl_size = ATOMIC_INIT(0);
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static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1];
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static struct ip6_flowlabel __rcu *fl_ht[FL_HASH_MASK+1];
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static void ip6_fl_gc(unsigned long dummy);
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static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
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/* FL hash table lock: it protects only of GC */
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static DEFINE_RWLOCK(ip6_fl_lock);
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static DEFINE_SPINLOCK(ip6_fl_lock);
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/* Big socket sock */
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static DEFINE_RWLOCK(ip6_sk_fl_lock);
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#define for_each_fl_rcu(hash, fl) \
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for (fl = rcu_dereference(fl_ht[(hash)]); \
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fl != NULL; \
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fl = rcu_dereference(fl->next))
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#define for_each_fl_continue_rcu(fl) \
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for (fl = rcu_dereference(fl->next); \
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fl != NULL; \
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fl = rcu_dereference(fl->next))
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static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label)
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{
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struct ip6_flowlabel *fl;
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for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) {
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for_each_fl_rcu(FL_HASH(label), fl) {
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if (fl->label == label && net_eq(fl->fl_net, net))
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return fl;
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}
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@ -80,11 +88,11 @@ static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label)
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{
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struct ip6_flowlabel *fl;
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read_lock_bh(&ip6_fl_lock);
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rcu_read_lock_bh();
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fl = __fl_lookup(net, label);
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if (fl)
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atomic_inc(&fl->users);
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read_unlock_bh(&ip6_fl_lock);
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if (fl && !atomic_inc_not_zero(&fl->users))
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fl = NULL;
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rcu_read_unlock_bh();
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return fl;
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}
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@ -96,13 +104,13 @@ static void fl_free(struct ip6_flowlabel *fl)
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put_pid(fl->owner.pid);
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release_net(fl->fl_net);
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kfree(fl->opt);
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kfree_rcu(fl, rcu);
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}
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kfree(fl);
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}
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static void fl_release(struct ip6_flowlabel *fl)
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{
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write_lock_bh(&ip6_fl_lock);
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spin_lock_bh(&ip6_fl_lock);
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fl->lastuse = jiffies;
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if (atomic_dec_and_test(&fl->users)) {
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@ -119,7 +127,7 @@ static void fl_release(struct ip6_flowlabel *fl)
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time_after(ip6_fl_gc_timer.expires, ttd))
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mod_timer(&ip6_fl_gc_timer, ttd);
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}
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write_unlock_bh(&ip6_fl_lock);
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spin_unlock_bh(&ip6_fl_lock);
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}
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static void ip6_fl_gc(unsigned long dummy)
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@ -128,12 +136,13 @@ static void ip6_fl_gc(unsigned long dummy)
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unsigned long now = jiffies;
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unsigned long sched = 0;
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write_lock(&ip6_fl_lock);
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spin_lock(&ip6_fl_lock);
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for (i=0; i<=FL_HASH_MASK; i++) {
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struct ip6_flowlabel *fl, **flp;
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flp = &fl_ht[i];
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while ((fl=*flp) != NULL) {
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while ((fl = rcu_dereference_protected(*flp,
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lockdep_is_held(&ip6_fl_lock))) != NULL) {
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if (atomic_read(&fl->users) == 0) {
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unsigned long ttd = fl->lastuse + fl->linger;
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if (time_after(ttd, fl->expires))
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@ -156,18 +165,19 @@ static void ip6_fl_gc(unsigned long dummy)
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if (sched) {
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mod_timer(&ip6_fl_gc_timer, sched);
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}
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write_unlock(&ip6_fl_lock);
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spin_unlock(&ip6_fl_lock);
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}
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static void __net_exit ip6_fl_purge(struct net *net)
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{
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int i;
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write_lock(&ip6_fl_lock);
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spin_lock(&ip6_fl_lock);
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for (i = 0; i <= FL_HASH_MASK; i++) {
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struct ip6_flowlabel *fl, **flp;
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flp = &fl_ht[i];
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while ((fl = *flp) != NULL) {
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while ((fl = rcu_dereference_protected(*flp,
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lockdep_is_held(&ip6_fl_lock))) != NULL) {
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if (net_eq(fl->fl_net, net) &&
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atomic_read(&fl->users) == 0) {
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*flp = fl->next;
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@ -178,7 +188,7 @@ static void __net_exit ip6_fl_purge(struct net *net)
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flp = &fl->next;
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}
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}
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write_unlock(&ip6_fl_lock);
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spin_unlock(&ip6_fl_lock);
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}
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static struct ip6_flowlabel *fl_intern(struct net *net,
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@ -188,7 +198,7 @@ static struct ip6_flowlabel *fl_intern(struct net *net,
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fl->label = label & IPV6_FLOWLABEL_MASK;
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write_lock_bh(&ip6_fl_lock);
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spin_lock_bh(&ip6_fl_lock);
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if (label == 0) {
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for (;;) {
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fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK;
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@ -210,16 +220,16 @@ static struct ip6_flowlabel *fl_intern(struct net *net,
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lfl = __fl_lookup(net, fl->label);
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if (lfl != NULL) {
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atomic_inc(&lfl->users);
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write_unlock_bh(&ip6_fl_lock);
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spin_unlock_bh(&ip6_fl_lock);
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return lfl;
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}
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}
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fl->lastuse = jiffies;
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fl->next = fl_ht[FL_HASH(fl->label)];
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fl_ht[FL_HASH(fl->label)] = fl;
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rcu_assign_pointer(fl_ht[FL_HASH(fl->label)], fl);
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atomic_inc(&fl_size);
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write_unlock_bh(&ip6_fl_lock);
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spin_unlock_bh(&ip6_fl_lock);
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return NULL;
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}
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@ -650,13 +660,13 @@ static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
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struct net *net = seq_file_net(seq);
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for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
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fl = fl_ht[state->bucket];
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while (fl && !net_eq(fl->fl_net, net))
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fl = fl->next;
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if (fl)
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break;
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for_each_fl_rcu(state->bucket, fl) {
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if (net_eq(fl->fl_net, net))
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goto out;
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}
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}
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fl = NULL;
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out:
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return fl;
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}
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@ -665,18 +675,22 @@ static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flo
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struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
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struct net *net = seq_file_net(seq);
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fl = fl->next;
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try_again:
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while (fl && !net_eq(fl->fl_net, net))
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fl = fl->next;
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while (!fl) {
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if (++state->bucket <= FL_HASH_MASK) {
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fl = fl_ht[state->bucket];
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goto try_again;
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} else
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break;
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for_each_fl_continue_rcu(fl) {
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if (net_eq(fl->fl_net, net))
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goto out;
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}
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try_again:
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if (++state->bucket <= FL_HASH_MASK) {
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for_each_fl_rcu(state->bucket, fl) {
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if (net_eq(fl->fl_net, net))
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goto out;
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}
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goto try_again;
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}
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fl = NULL;
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out:
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return fl;
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}
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@ -690,9 +704,9 @@ static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
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}
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static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
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__acquires(ip6_fl_lock)
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__acquires(RCU)
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{
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read_lock_bh(&ip6_fl_lock);
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rcu_read_lock_bh();
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return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
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}
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@ -709,9 +723,9 @@ static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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}
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static void ip6fl_seq_stop(struct seq_file *seq, void *v)
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__releases(ip6_fl_lock)
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__releases(RCU)
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{
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read_unlock_bh(&ip6_fl_lock);
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rcu_read_unlock_bh();
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}
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static int ip6fl_seq_show(struct seq_file *seq, void *v)
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