| /* |
| * 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, int padattr) |
| { |
| if (nla_put_64bit(d->skb, type, size, buf, padattr)) |
| goto nla_put_failure; |
| return 0; |
| |
| nla_put_failure: |
| if (d->lock) |
| spin_unlock_bh(d->lock); |
| kfree(d->xstats); |
| d->xstats = NULL; |
| d->xstats_len = 0; |
| 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 |
| * @padattr: padding attribute |
| * |
| * 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, int padattr) |
| __acquires(lock) |
| { |
| memset(d, 0, sizeof(*d)); |
| |
| 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; |
| d->padattr = padattr; |
| if (lock) { |
| d->lock = lock; |
| spin_lock_bh(lock); |
| } |
| if (d->tail) { |
| int ret = gnet_stats_copy(d, type, NULL, 0, padattr); |
| |
| /* The initial attribute added in gnet_stats_copy() may be |
| * preceded by a padding attribute, in which case d->tail will |
| * end up pointing at the padding instead of the real attribute. |
| * Fix this so gnet_stats_finish_copy() adjusts the length of |
| * the right attribute. |
| */ |
| if (ret == 0 && d->tail->nla_type == padattr) |
| d->tail = (struct nlattr *)((char *)d->tail + |
| NLA_ALIGN(d->tail->nla_len)); |
| return ret; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(gnet_stats_start_copy_compat); |
| |
| /** |
| * gnet_stats_start_copy - 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 |
| * @padattr: padding attribute |
| * |
| * 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, int padattr) |
| { |
| return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d, padattr); |
| } |
| 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(const seqcount_t *running, |
| struct gnet_stats_basic_packed *bstats, |
| struct gnet_stats_basic_cpu __percpu *cpu, |
| struct gnet_stats_basic_packed *b) |
| { |
| unsigned int seq; |
| |
| if (cpu) { |
| __gnet_stats_copy_basic_cpu(bstats, cpu); |
| return; |
| } |
| do { |
| if (running) |
| seq = read_seqcount_begin(running); |
| bstats->bytes = b->bytes; |
| bstats->packets = b->packets; |
| } while (running && read_seqcount_retry(running, seq)); |
| } |
| EXPORT_SYMBOL(__gnet_stats_copy_basic); |
| |
| /** |
| * gnet_stats_copy_basic - copy basic statistics into statistic TLV |
| * @running: seqcount_t pointer |
| * @d: dumping handle |
| * @cpu: copy statistic per cpu |
| * @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(const seqcount_t *running, |
| 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(running, &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), |
| TCA_STATS_PAD); |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL(gnet_stats_copy_basic); |
| |
| /** |
| * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV |
| * @d: dumping handle |
| * @rate_est: rate estimator |
| * |
| * 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, |
| struct net_rate_estimator __rcu **rate_est) |
| { |
| struct gnet_stats_rate_est64 sample; |
| struct gnet_stats_rate_est est; |
| int res; |
| |
| if (!gen_estimator_read(rate_est, &sample)) |
| return 0; |
| est.bps = min_t(u64, UINT_MAX, sample.bps); |
| /* we have some time before reaching 2^32 packets per second */ |
| est.pps = sample.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), |
| TCA_STATS_PAD); |
| if (res < 0 || est.bps == sample.bps) |
| return res; |
| /* emit 64bit stats only if needed */ |
| return gnet_stats_copy(d, TCA_STATS_RATE_EST64, &sample, |
| sizeof(sample), TCA_STATS_PAD); |
| } |
| |
| 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), |
| TCA_STATS_PAD); |
| |
| 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, |
| TCA_STATS_PAD); |
| |
| return 0; |
| |
| err_out: |
| if (d->lock) |
| spin_unlock_bh(d->lock); |
| d->xstats_len = 0; |
| 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), d->padattr) < 0) |
| return -1; |
| |
| if (d->compat_xstats && d->xstats) { |
| if (gnet_stats_copy(d, d->compat_xstats, d->xstats, |
| d->xstats_len, d->padattr) < 0) |
| return -1; |
| } |
| |
| if (d->lock) |
| spin_unlock_bh(d->lock); |
| kfree(d->xstats); |
| d->xstats = NULL; |
| d->xstats_len = 0; |
| return 0; |
| } |
| EXPORT_SYMBOL(gnet_stats_finish_copy); |