--- /dev/null
+/*
+ * net/core/gen_stats.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Authors: Thomas Graf <tgraf@suug.ch>
+ * Jamal Hadi Salim
+ * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ * See Documentation/networking/gen_stats.txt
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/socket.h>
+#include <linux/rtnetlink.h>
+#include <linux/gen_stats.h>
+#include <net/netlink.h>
+#include <net/gen_stats.h>
+
+
+static inline int
+gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size)
+{
+ if (nla_put(d->skb, type, size, buf))
+ goto nla_put_failure;
+ return 0;
+
+nla_put_failure:
+ kfree(d->xstats);
+ d->xstats = NULL;
+ d->xstats_len = 0;
+ spin_unlock_bh(d->lock);
+ return -1;
+}
+
+/**
+ * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
+ * @skb: socket buffer to put statistics TLVs into
+ * @type: TLV type for top level statistic TLV
+ * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
+ * @xstats_type: TLV type for backward compatibility xstats TLV
+ * @lock: statistics lock
+ * @d: dumping handle
+ *
+ * Initializes the dumping handle, grabs the statistic lock and appends
+ * an empty TLV header to the socket buffer for use a container for all
+ * other statistic TLVS.
+ *
+ * The dumping handle is marked to be in backward compatibility mode telling
+ * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
+ *
+ * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
+ */
+int
+gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
+ int xstats_type, spinlock_t *lock, struct gnet_dump *d)
+ __acquires(lock)
+{
+ memset(d, 0, sizeof(*d));
+
+ spin_lock_bh(lock);
+ d->lock = lock;
+ if (type)
+ d->tail = (struct nlattr *)skb_tail_pointer(skb);
+ d->skb = skb;
+ d->compat_tc_stats = tc_stats_type;
+ d->compat_xstats = xstats_type;
+
+ if (d->tail)
+ return gnet_stats_copy(d, type, NULL, 0);
+
+ return 0;
+}
+EXPORT_SYMBOL(gnet_stats_start_copy_compat);
+
+/**
+ * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
+ * @skb: socket buffer to put statistics TLVs into
+ * @type: TLV type for top level statistic TLV
+ * @lock: statistics lock
+ * @d: dumping handle
+ *
+ * Initializes the dumping handle, grabs the statistic lock and appends
+ * an empty TLV header to the socket buffer for use a container for all
+ * other statistic TLVS.
+ *
+ * Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
+ */
+int
+gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
+ struct gnet_dump *d)
+{
+ return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d);
+}
+EXPORT_SYMBOL(gnet_stats_start_copy);
+
+static void
+__gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats,
+ struct gnet_stats_basic_cpu __percpu *cpu)
+{
+ int i;
+
+ for_each_possible_cpu(i) {
+ struct gnet_stats_basic_cpu *bcpu = per_cpu_ptr(cpu, i);
+ unsigned int start;
+ u64 bytes;
+ u32 packets;
+
+ do {
+ start = u64_stats_fetch_begin_irq(&bcpu->syncp);
+ bytes = bcpu->bstats.bytes;
+ packets = bcpu->bstats.packets;
+ } while (u64_stats_fetch_retry_irq(&bcpu->syncp, start));
+
+ bstats->bytes += bytes;
+ bstats->packets += packets;
+ }
+}
+
+void
+__gnet_stats_copy_basic(struct gnet_stats_basic_packed *bstats,
+ struct gnet_stats_basic_cpu __percpu *cpu,
+ struct gnet_stats_basic_packed *b)
+{
+ if (cpu) {
+ __gnet_stats_copy_basic_cpu(bstats, cpu);
+ } else {
+ bstats->bytes = b->bytes;
+ bstats->packets = b->packets;
+ }
+}
+EXPORT_SYMBOL(__gnet_stats_copy_basic);
+
+/**
+ * gnet_stats_copy_basic - copy basic statistics into statistic TLV
+ * @d: dumping handle
+ * @b: basic statistics
+ *
+ * Appends the basic statistics to the top level TLV created by
+ * gnet_stats_start_copy().
+ *
+ * Returns 0 on success or -1 with the statistic lock released
+ * if the room in the socket buffer was not sufficient.
+ */
+int
+gnet_stats_copy_basic(struct gnet_dump *d,
+ struct gnet_stats_basic_cpu __percpu *cpu,
+ struct gnet_stats_basic_packed *b)
+{
+ struct gnet_stats_basic_packed bstats = {0};
+
+ __gnet_stats_copy_basic(&bstats, cpu, b);
+
+ if (d->compat_tc_stats) {
+ d->tc_stats.bytes = bstats.bytes;
+ d->tc_stats.packets = bstats.packets;
+ }
+
+ if (d->tail) {
+ struct gnet_stats_basic sb;
+
+ memset(&sb, 0, sizeof(sb));
+ sb.bytes = bstats.bytes;
+ sb.packets = bstats.packets;
+ return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb));
+ }
+ return 0;
+}
+EXPORT_SYMBOL(gnet_stats_copy_basic);
+
+/**
+ * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
+ * @d: dumping handle
+ * @b: basic statistics
+ * @r: rate estimator statistics
+ *
+ * Appends the rate estimator statistics to the top level TLV created by
+ * gnet_stats_start_copy().
+ *
+ * Returns 0 on success or -1 with the statistic lock released
+ * if the room in the socket buffer was not sufficient.
+ */
+int
+gnet_stats_copy_rate_est(struct gnet_dump *d,
+ const struct gnet_stats_basic_packed *b,
+ struct gnet_stats_rate_est64 *r)
+{
+ struct gnet_stats_rate_est est;
+ int res;
+
+ if (b && !gen_estimator_active(b, r))
+ return 0;
+
+ est.bps = min_t(u64, UINT_MAX, r->bps);
+ /* we have some time before reaching 2^32 packets per second */
+ est.pps = r->pps;
+
+ if (d->compat_tc_stats) {
+ d->tc_stats.bps = est.bps;
+ d->tc_stats.pps = est.pps;
+ }
+
+ if (d->tail) {
+ res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est));
+ if (res < 0 || est.bps == r->bps)
+ return res;
+ /* emit 64bit stats only if needed */
+ return gnet_stats_copy(d, TCA_STATS_RATE_EST64, r, sizeof(*r));
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(gnet_stats_copy_rate_est);
+
+static void
+__gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats,
+ const struct gnet_stats_queue __percpu *q)
+{
+ int i;
+
+ for_each_possible_cpu(i) {
+ const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i);
+
+ qstats->qlen = 0;
+ qstats->backlog += qcpu->backlog;
+ qstats->drops += qcpu->drops;
+ qstats->requeues += qcpu->requeues;
+ qstats->overlimits += qcpu->overlimits;
+ }
+}
+
+static void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats,
+ const struct gnet_stats_queue __percpu *cpu,
+ const struct gnet_stats_queue *q,
+ __u32 qlen)
+{
+ if (cpu) {
+ __gnet_stats_copy_queue_cpu(qstats, cpu);
+ } else {
+ qstats->qlen = q->qlen;
+ qstats->backlog = q->backlog;
+ qstats->drops = q->drops;
+ qstats->requeues = q->requeues;
+ qstats->overlimits = q->overlimits;
+ }
+
+ qstats->qlen = qlen;
+}
+
+/**
+ * gnet_stats_copy_queue - copy queue statistics into statistics TLV
+ * @d: dumping handle
+ * @cpu_q: per cpu queue statistics
+ * @q: queue statistics
+ * @qlen: queue length statistics
+ *
+ * Appends the queue statistics to the top level TLV created by
+ * gnet_stats_start_copy(). Using per cpu queue statistics if
+ * they are available.
+ *
+ * Returns 0 on success or -1 with the statistic lock released
+ * if the room in the socket buffer was not sufficient.
+ */
+int
+gnet_stats_copy_queue(struct gnet_dump *d,
+ struct gnet_stats_queue __percpu *cpu_q,
+ struct gnet_stats_queue *q, __u32 qlen)
+{
+ struct gnet_stats_queue qstats = {0};
+
+ __gnet_stats_copy_queue(&qstats, cpu_q, q, qlen);
+
+ if (d->compat_tc_stats) {
+ d->tc_stats.drops = qstats.drops;
+ d->tc_stats.qlen = qstats.qlen;
+ d->tc_stats.backlog = qstats.backlog;
+ d->tc_stats.overlimits = qstats.overlimits;
+ }
+
+ if (d->tail)
+ return gnet_stats_copy(d, TCA_STATS_QUEUE,
+ &qstats, sizeof(qstats));
+
+ return 0;
+}
+EXPORT_SYMBOL(gnet_stats_copy_queue);
+
+/**
+ * gnet_stats_copy_app - copy application specific statistics into statistics TLV
+ * @d: dumping handle
+ * @st: application specific statistics data
+ * @len: length of data
+ *
+ * Appends the application specific statistics to the top level TLV created by
+ * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
+ * handle is in backward compatibility mode.
+ *
+ * Returns 0 on success or -1 with the statistic lock released
+ * if the room in the socket buffer was not sufficient.
+ */
+int
+gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
+{
+ if (d->compat_xstats) {
+ d->xstats = kmemdup(st, len, GFP_ATOMIC);
+ if (!d->xstats)
+ goto err_out;
+ d->xstats_len = len;
+ }
+
+ if (d->tail)
+ return gnet_stats_copy(d, TCA_STATS_APP, st, len);
+
+ return 0;
+
+err_out:
+ d->xstats_len = 0;
+ spin_unlock_bh(d->lock);
+ return -1;
+}
+EXPORT_SYMBOL(gnet_stats_copy_app);
+
+/**
+ * gnet_stats_finish_copy - finish dumping procedure
+ * @d: dumping handle
+ *
+ * Corrects the length of the top level TLV to include all TLVs added
+ * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
+ * if gnet_stats_start_copy_compat() was used and releases the statistics
+ * lock.
+ *
+ * Returns 0 on success or -1 with the statistic lock released
+ * if the room in the socket buffer was not sufficient.
+ */
+int
+gnet_stats_finish_copy(struct gnet_dump *d)
+{
+ if (d->tail)
+ d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
+
+ if (d->compat_tc_stats)
+ if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
+ sizeof(d->tc_stats)) < 0)
+ return -1;
+
+ if (d->compat_xstats && d->xstats) {
+ if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
+ d->xstats_len) < 0)
+ return -1;
+ }
+
+ kfree(d->xstats);
+ d->xstats = NULL;
+ d->xstats_len = 0;
+ spin_unlock_bh(d->lock);
+ return 0;
+}
+EXPORT_SYMBOL(gnet_stats_finish_copy);
Code Review / kvmfornfv.git / blobdiff