cregit-Linux how code gets into the kernel

Release 4.11 net/core/gen_stats.c

Directory: net/core
/*
 * 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; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller4754.65%233.33%
Ignacy Gawędzki1922.09%116.67%
Eric Dumazet1315.12%116.67%
Nicolas Dichtel66.98%116.67%
Patrick McHardy11.16%116.67%
Total86100.00%6100.00%

/** * 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) return gnet_stats_copy(d, type, NULL, 0, padattr); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller7356.15%112.50%
Eric Dumazet2116.15%225.00%
Thomas Graf2116.15%225.00%
Nicolas Dichtel118.46%112.50%
Arnaldo Carvalho de Melo32.31%112.50%
Patrick McHardy10.77%112.50%
Total130100.00%8100.00%

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); }

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David S. Miller3888.37%150.00%
Nicolas Dichtel511.63%150.00%
Total43100.00%2100.00%

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; } }

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John Fastabend10098.04%150.00%
Américo Wang21.96%150.00%
Total102100.00%2100.00%


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)); }

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John Fastabend5260.47%150.00%
Eric Dumazet3439.53%150.00%
Total86100.00%2100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller5137.50%116.67%
Eric Dumazet4230.88%233.33%
John Fastabend3223.53%116.67%
Thomas Graf96.62%116.67%
Nicolas Dichtel21.47%116.67%
Total136100.00%6100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet9961.88%350.00%
David S. Miller4830.00%116.67%
Thomas Graf95.62%116.67%
Nicolas Dichtel42.50%116.67%
Total160100.00%6100.00%

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; } }

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PersonTokensPropCommitsCommitProp
John Fastabend78100.00%1100.00%
Total78100.00%1100.00%


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; }

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PersonTokensPropCommitsCommitProp
John Fastabend89100.00%1100.00%
Total89100.00%1100.00%

/** * 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; }

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PersonTokensPropCommitsCommitProp
David S. Miller6857.14%120.00%
John Fastabend4033.61%240.00%
Thomas Graf97.56%120.00%
Nicolas Dichtel21.68%120.00%
Total119100.00%5100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller4241.18%116.67%
Ignacy Gawędzki3231.37%116.67%
Thomas Graf1615.69%233.33%
Eric Dumazet109.80%116.67%
Nicolas Dichtel21.96%116.67%
Total102100.00%6100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller10166.45%112.50%
Ignacy Gawędzki1912.50%112.50%
Eric Dumazet138.55%112.50%
Nicolas Dichtel85.26%112.50%
Thomas Graf74.61%225.00%
Arnaldo Carvalho de Melo31.97%112.50%
Patrick McHardy10.66%112.50%
Total152100.00%8100.00%

EXPORT_SYMBOL(gnet_stats_finish_copy);

Overall Contributors

PersonTokensPropCommitsCommitProp
David S. Miller49836.67%28.33%
John Fastabend39729.23%312.50%
Eric Dumazet26619.59%937.50%
Thomas Graf725.30%416.67%
Ignacy Gawędzki705.15%14.17%
Nicolas Dichtel402.95%14.17%
Arnaldo Carvalho de Melo60.44%14.17%
Patrick McHardy60.44%14.17%
Américo Wang20.15%14.17%
Masanari Iida10.07%14.17%
Total1358100.00%24100.00%
Directory: net/core
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