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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /include/linux/u64_stats_sync.h
Initial import
Diffstat (limited to 'include/linux/u64_stats_sync.h')
-rw-r--r--include/linux/u64_stats_sync.h147
1 files changed, 147 insertions, 0 deletions
diff --git a/include/linux/u64_stats_sync.h b/include/linux/u64_stats_sync.h
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+++ b/include/linux/u64_stats_sync.h
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+#ifndef _LINUX_U64_STATS_SYNC_H
+#define _LINUX_U64_STATS_SYNC_H
+
+/*
+ * To properly implement 64bits network statistics on 32bit and 64bit hosts,
+ * we provide a synchronization point, that is a noop on 64bit or UP kernels.
+ *
+ * Key points :
+ * 1) Use a seqcount on SMP 32bits, with low overhead.
+ * 2) Whole thing is a noop on 64bit arches or UP kernels.
+ * 3) Write side must ensure mutual exclusion or one seqcount update could
+ * be lost, thus blocking readers forever.
+ * If this synchronization point is not a mutex, but a spinlock or
+ * spinlock_bh() or disable_bh() :
+ * 3.1) Write side should not sleep.
+ * 3.2) Write side should not allow preemption.
+ * 3.3) If applicable, interrupts should be disabled.
+ *
+ * 4) If reader fetches several counters, there is no guarantee the whole values
+ * are consistent (remember point 1) : this is a noop on 64bit arches anyway)
+ *
+ * 5) readers are allowed to sleep or be preempted/interrupted : They perform
+ * pure reads. But if they have to fetch many values, it's better to not allow
+ * preemptions/interruptions to avoid many retries.
+ *
+ * 6) If counter might be written by an interrupt, readers should block interrupts.
+ * (On UP, there is no seqcount_t protection, a reader allowing interrupts could
+ * read partial values)
+ *
+ * 7) For irq and softirq uses, readers can use u64_stats_fetch_begin_irq() and
+ * u64_stats_fetch_retry_irq() helpers
+ *
+ * Usage :
+ *
+ * Stats producer (writer) should use following template granted it already got
+ * an exclusive access to counters (a lock is already taken, or per cpu
+ * data is used [in a non preemptable context])
+ *
+ * spin_lock_bh(...) or other synchronization to get exclusive access
+ * ...
+ * u64_stats_update_begin(&stats->syncp);
+ * stats->bytes64 += len; // non atomic operation
+ * stats->packets64++; // non atomic operation
+ * u64_stats_update_end(&stats->syncp);
+ *
+ * While a consumer (reader) should use following template to get consistent
+ * snapshot for each variable (but no guarantee on several ones)
+ *
+ * u64 tbytes, tpackets;
+ * unsigned int start;
+ *
+ * do {
+ * start = u64_stats_fetch_begin(&stats->syncp);
+ * tbytes = stats->bytes64; // non atomic operation
+ * tpackets = stats->packets64; // non atomic operation
+ * } while (u64_stats_fetch_retry(&stats->syncp, start));
+ *
+ *
+ * Example of use in drivers/net/loopback.c, using per_cpu containers,
+ * in BH disabled context.
+ */
+#include <linux/seqlock.h>
+
+struct u64_stats_sync {
+#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
+ seqcount_t seq;
+#endif
+};
+
+
+#if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
+# define u64_stats_init(syncp) seqcount_init(syncp.seq)
+#else
+# define u64_stats_init(syncp) do { } while (0)
+#endif
+
+static inline void u64_stats_update_begin(struct u64_stats_sync *syncp)
+{
+#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
+ write_seqcount_begin(&syncp->seq);
+#endif
+}
+
+static inline void u64_stats_update_end(struct u64_stats_sync *syncp)
+{
+#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
+ write_seqcount_end(&syncp->seq);
+#endif
+}
+
+static inline unsigned int u64_stats_fetch_begin(const struct u64_stats_sync *syncp)
+{
+#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
+ return read_seqcount_begin(&syncp->seq);
+#else
+#if BITS_PER_LONG==32
+ preempt_disable();
+#endif
+ return 0;
+#endif
+}
+
+static inline bool u64_stats_fetch_retry(const struct u64_stats_sync *syncp,
+ unsigned int start)
+{
+#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
+ return read_seqcount_retry(&syncp->seq, start);
+#else
+#if BITS_PER_LONG==32
+ preempt_enable();
+#endif
+ return false;
+#endif
+}
+
+/*
+ * In case irq handlers can update u64 counters, readers can use following helpers
+ * - SMP 32bit arches use seqcount protection, irq safe.
+ * - UP 32bit must disable irqs.
+ * - 64bit have no problem atomically reading u64 values, irq safe.
+ */
+static inline unsigned int u64_stats_fetch_begin_irq(const struct u64_stats_sync *syncp)
+{
+#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
+ return read_seqcount_begin(&syncp->seq);
+#else
+#if BITS_PER_LONG==32
+ local_irq_disable();
+#endif
+ return 0;
+#endif
+}
+
+static inline bool u64_stats_fetch_retry_irq(const struct u64_stats_sync *syncp,
+ unsigned int start)
+{
+#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
+ return read_seqcount_retry(&syncp->seq, start);
+#else
+#if BITS_PER_LONG==32
+ local_irq_enable();
+#endif
+ return false;
+#endif
+}
+
+#endif /* _LINUX_U64_STATS_SYNC_H */