extern struct xt_table_info *xt_alloc_table_info(unsigned int size);
extern void xt_free_table_info(struct xt_table_info *info);
-/*
- * Per-CPU spinlock associated with per-cpu table entries, and
- * with a counter for the "reading" side that allows a recursive
- * reader to avoid taking the lock and deadlocking.
- *
- * "reading" is used by ip/arp/ip6 tables rule processing which runs per-cpu.
- * It needs to ensure that the rules are not being changed while the packet
- * is being processed. In some cases, the read lock will be acquired
- * twice on the same CPU; this is okay because of the count.
- *
- * "writing" is used when reading counters.
- * During replace any readers that are using the old tables have to complete
- * before freeing the old table. This is handled by the write locking
- * necessary for reading the counters.
+/**
+ * xt_recseq - recursive seqcount for netfilter use
+ *
+ * Packet processing changes the seqcount only if no recursion happened
+ * get_counters() can use read_seqcount_begin()/read_seqcount_retry(),
+ * because we use the normal seqcount convention :
+ * Low order bit set to 1 if a writer is active.
*/
-struct xt_info_lock {
- seqlock_t lock;
- unsigned char readers;
-};
-DECLARE_PER_CPU(struct xt_info_lock, xt_info_locks);
+DECLARE_PER_CPU(seqcount_t, xt_recseq);
-/*
- * Note: we need to ensure that preemption is disabled before acquiring
- * the per-cpu-variable, so we do it as a two step process rather than
- * using "spin_lock_bh()".
- *
- * We _also_ need to disable bottom half processing before updating our
- * nesting count, to make sure that the only kind of re-entrancy is this
- * code being called by itself: since the count+lock is not an atomic
- * operation, we can allow no races.
+/**
+ * xt_write_recseq_begin - start of a write section
*
- * _Only_ that special combination of being per-cpu and never getting
- * re-entered asynchronously means that the count is safe.
+ * Begin packet processing : all readers must wait the end
+ * 1) Must be called with preemption disabled
+ * 2) softirqs must be disabled too (or we should use irqsafe_cpu_add())
+ * Returns :
+ * 1 if no recursion on this cpu
+ * 0 if recursion detected
*/
-static inline void xt_info_rdlock_bh(void)
+static inline unsigned int xt_write_recseq_begin(void)
{
- struct xt_info_lock *lock;
+ unsigned int addend;
- local_bh_disable();
- lock = &__get_cpu_var(xt_info_locks);
- if (likely(!lock->readers++))
- write_seqlock(&lock->lock);
-}
+ /*
+ * Low order bit of sequence is set if we already
+ * called xt_write_recseq_begin().
+ */
+ addend = (__this_cpu_read(xt_recseq.sequence) + 1) & 1;
-static inline void xt_info_rdunlock_bh(void)
-{
- struct xt_info_lock *lock = &__get_cpu_var(xt_info_locks);
+ /*
+ * This is kind of a write_seqcount_begin(), but addend is 0 or 1
+ * We dont check addend value to avoid a test and conditional jump,
+ * since addend is most likely 1
+ */
+ __this_cpu_add(xt_recseq.sequence, addend);
+ smp_wmb();
- if (likely(!--lock->readers))
- write_sequnlock(&lock->lock);
- local_bh_enable();
+ return addend;
}
-/*
- * The "writer" side needs to get exclusive access to the lock,
- * regardless of readers. This must be called with bottom half
- * processing (and thus also preemption) disabled.
+/**
+ * xt_write_recseq_end - end of a write section
+ * @addend: return value from previous xt_write_recseq_begin()
+ *
+ * End packet processing : all readers can proceed
+ * 1) Must be called with preemption disabled
+ * 2) softirqs must be disabled too (or we should use irqsafe_cpu_add())
*/
-static inline void xt_info_wrlock(unsigned int cpu)
-{
- write_seqlock(&per_cpu(xt_info_locks, cpu).lock);
-}
-
-static inline void xt_info_wrunlock(unsigned int cpu)
+static inline void xt_write_recseq_end(unsigned int addend)
{
- write_sequnlock(&per_cpu(xt_info_locks, cpu).lock);
+ /* this is kind of a write_seqcount_end(), but addend is 0 or 1 */
+ smp_wmb();
+ __this_cpu_add(xt_recseq.sequence, addend);
}
/*
void *table_base;
const struct xt_table_info *private;
struct xt_action_param acpar;
+ unsigned int addend;
if (!pskb_may_pull(skb, arp_hdr_len(skb->dev)))
return NF_DROP;
indev = in ? in->name : nulldevname;
outdev = out ? out->name : nulldevname;
- xt_info_rdlock_bh();
+ local_bh_disable();
+ addend = xt_write_recseq_begin();
private = table->private;
table_base = private->entries[smp_processor_id()];
/* Verdict */
break;
} while (!acpar.hotdrop);
- xt_info_rdunlock_bh();
+ xt_write_recseq_end(addend);
+ local_bh_enable();
if (acpar.hotdrop)
return NF_DROP;
unsigned int i;
for_each_possible_cpu(cpu) {
- seqlock_t *lock = &per_cpu(xt_info_locks, cpu).lock;
+ seqcount_t *s = &per_cpu(xt_recseq, cpu);
i = 0;
xt_entry_foreach(iter, t->entries[cpu], t->size) {
unsigned int start;
do {
- start = read_seqbegin(lock);
+ start = read_seqcount_begin(s);
bcnt = iter->counters.bcnt;
pcnt = iter->counters.pcnt;
- } while (read_seqretry(lock, start));
+ } while (read_seqcount_retry(s, start));
ADD_COUNTER(counters[i], bcnt, pcnt);
++i;
int ret = 0;
void *loc_cpu_entry;
struct arpt_entry *iter;
+ unsigned int addend;
#ifdef CONFIG_COMPAT
struct compat_xt_counters_info compat_tmp;
/* Choose the copy that is on our node */
curcpu = smp_processor_id();
loc_cpu_entry = private->entries[curcpu];
- xt_info_wrlock(curcpu);
+ addend = xt_write_recseq_begin();
xt_entry_foreach(iter, loc_cpu_entry, private->size) {
ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt);
++i;
}
- xt_info_wrunlock(curcpu);
+ xt_write_recseq_end(addend);
unlock_up_free:
local_bh_enable();
xt_table_unlock(t);
}
EXPORT_SYMBOL_GPL(ipt_alloc_initial_table);
-/*
- We keep a set of rules for each CPU, so we can avoid write-locking
- them in the softirq when updating the counters and therefore
- only need to read-lock in the softirq; doing a write_lock_bh() in user
- context stops packets coming through and allows user context to read
- the counters or update the rules.
-
- Hence the start of any table is given by get_table() below. */
-
/* Returns whether matches rule or not. */
/* Performance critical - called for every packet */
static inline bool
unsigned int *stackptr, origptr, cpu;
const struct xt_table_info *private;
struct xt_action_param acpar;
+ unsigned int addend;
/* Initialization */
ip = ip_hdr(skb);
acpar.hooknum = hook;
IP_NF_ASSERT(table->valid_hooks & (1 << hook));
- xt_info_rdlock_bh();
+ local_bh_disable();
+ addend = xt_write_recseq_begin();
private = table->private;
cpu = smp_processor_id();
table_base = private->entries[cpu];
pr_debug("Exiting %s; resetting sp from %u to %u\n",
__func__, *stackptr, origptr);
*stackptr = origptr;
- xt_info_rdunlock_bh();
+ xt_write_recseq_end(addend);
+ local_bh_enable();
+
#ifdef DEBUG_ALLOW_ALL
return NF_ACCEPT;
#else
unsigned int i;
for_each_possible_cpu(cpu) {
- seqlock_t *lock = &per_cpu(xt_info_locks, cpu).lock;
+ seqcount_t *s = &per_cpu(xt_recseq, cpu);
i = 0;
xt_entry_foreach(iter, t->entries[cpu], t->size) {
unsigned int start;
do {
- start = read_seqbegin(lock);
+ start = read_seqcount_begin(s);
bcnt = iter->counters.bcnt;
pcnt = iter->counters.pcnt;
- } while (read_seqretry(lock, start));
+ } while (read_seqcount_retry(s, start));
ADD_COUNTER(counters[i], bcnt, pcnt);
++i; /* macro does multi eval of i */
int ret = 0;
void *loc_cpu_entry;
struct ipt_entry *iter;
+ unsigned int addend;
#ifdef CONFIG_COMPAT
struct compat_xt_counters_info compat_tmp;
/* Choose the copy that is on our node */
curcpu = smp_processor_id();
loc_cpu_entry = private->entries[curcpu];
- xt_info_wrlock(curcpu);
+ addend = xt_write_recseq_begin();
xt_entry_foreach(iter, loc_cpu_entry, private->size) {
ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt);
++i;
}
- xt_info_wrunlock(curcpu);
+ xt_write_recseq_end(addend);
unlock_up_free:
local_bh_enable();
xt_table_unlock(t);
unsigned int *stackptr, origptr, cpu;
const struct xt_table_info *private;
struct xt_action_param acpar;
+ unsigned int addend;
/* Initialization */
indev = in ? in->name : nulldevname;
IP_NF_ASSERT(table->valid_hooks & (1 << hook));
- xt_info_rdlock_bh();
+ local_bh_disable();
+ addend = xt_write_recseq_begin();
private = table->private;
cpu = smp_processor_id();
table_base = private->entries[cpu];
} while (!acpar.hotdrop);
*stackptr = origptr;
- xt_info_rdunlock_bh();
+
+ xt_write_recseq_end(addend);
+ local_bh_enable();
#ifdef DEBUG_ALLOW_ALL
return NF_ACCEPT;
unsigned int i;
for_each_possible_cpu(cpu) {
- seqlock_t *lock = &per_cpu(xt_info_locks, cpu).lock;
+ seqcount_t *s = &per_cpu(xt_recseq, cpu);
i = 0;
xt_entry_foreach(iter, t->entries[cpu], t->size) {
unsigned int start;
do {
- start = read_seqbegin(lock);
+ start = read_seqcount_begin(s);
bcnt = iter->counters.bcnt;
pcnt = iter->counters.pcnt;
- } while (read_seqretry(lock, start));
+ } while (read_seqcount_retry(s, start));
ADD_COUNTER(counters[i], bcnt, pcnt);
++i;
int ret = 0;
const void *loc_cpu_entry;
struct ip6t_entry *iter;
+ unsigned int addend;
#ifdef CONFIG_COMPAT
struct compat_xt_counters_info compat_tmp;
i = 0;
/* Choose the copy that is on our node */
curcpu = smp_processor_id();
- xt_info_wrlock(curcpu);
+ addend = xt_write_recseq_begin();
loc_cpu_entry = private->entries[curcpu];
xt_entry_foreach(iter, loc_cpu_entry, private->size) {
ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt);
++i;
}
- xt_info_wrunlock(curcpu);
+ xt_write_recseq_end(addend);
unlock_up_free:
local_bh_enable();
EXPORT_SYMBOL_GPL(xt_compat_unlock);
#endif
-DEFINE_PER_CPU(struct xt_info_lock, xt_info_locks);
-EXPORT_PER_CPU_SYMBOL_GPL(xt_info_locks);
+DEFINE_PER_CPU(seqcount_t, xt_recseq);
+EXPORT_PER_CPU_SYMBOL_GPL(xt_recseq);
static int xt_jumpstack_alloc(struct xt_table_info *i)
{
int rv;
for_each_possible_cpu(i) {
- struct xt_info_lock *lock = &per_cpu(xt_info_locks, i);
-
- seqlock_init(&lock->lock);
- lock->readers = 0;
+ seqcount_init(&per_cpu(xt_recseq, i));
}
xt = kmalloc(sizeof(struct xt_af) * NFPROTO_NUMPROTO, GFP_KERNEL);
projects / platform / kernel / linux-rpi.git / commitdiff