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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
430 lines
11 KiB
C
430 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net/core/gen_stats.c
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*
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* Authors: Thomas Graf <tgraf@suug.ch>
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* Jamal Hadi Salim
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* Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* See Documentation/networking/gen_stats.txt
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/socket.h>
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#include <linux/rtnetlink.h>
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#include <linux/gen_stats.h>
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#include <net/netlink.h>
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#include <net/gen_stats.h>
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static inline int
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gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size, int padattr)
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{
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if (nla_put_64bit(d->skb, type, size, buf, padattr))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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if (d->lock)
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spin_unlock_bh(d->lock);
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kfree(d->xstats);
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d->xstats = NULL;
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d->xstats_len = 0;
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return -1;
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}
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/**
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* gnet_stats_start_copy_compat - start dumping procedure in compatibility mode
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* @skb: socket buffer to put statistics TLVs into
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* @type: TLV type for top level statistic TLV
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* @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV
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* @xstats_type: TLV type for backward compatibility xstats TLV
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* @lock: statistics lock
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* @d: dumping handle
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* @padattr: padding attribute
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*
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* Initializes the dumping handle, grabs the statistic lock and appends
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* an empty TLV header to the socket buffer for use a container for all
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* other statistic TLVS.
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*
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* The dumping handle is marked to be in backward compatibility mode telling
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* all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats.
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*
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* Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
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*/
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int
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gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
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int xstats_type, spinlock_t *lock,
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struct gnet_dump *d, int padattr)
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__acquires(lock)
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{
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memset(d, 0, sizeof(*d));
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if (type)
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d->tail = (struct nlattr *)skb_tail_pointer(skb);
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d->skb = skb;
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d->compat_tc_stats = tc_stats_type;
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d->compat_xstats = xstats_type;
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d->padattr = padattr;
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if (lock) {
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d->lock = lock;
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spin_lock_bh(lock);
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}
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if (d->tail) {
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int ret = gnet_stats_copy(d, type, NULL, 0, padattr);
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/* The initial attribute added in gnet_stats_copy() may be
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* preceded by a padding attribute, in which case d->tail will
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* end up pointing at the padding instead of the real attribute.
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* Fix this so gnet_stats_finish_copy() adjusts the length of
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* the right attribute.
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*/
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if (ret == 0 && d->tail->nla_type == padattr)
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d->tail = (struct nlattr *)((char *)d->tail +
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NLA_ALIGN(d->tail->nla_len));
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL(gnet_stats_start_copy_compat);
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/**
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* gnet_stats_start_copy - start dumping procedure in compatibility mode
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* @skb: socket buffer to put statistics TLVs into
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* @type: TLV type for top level statistic TLV
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* @lock: statistics lock
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* @d: dumping handle
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* @padattr: padding attribute
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*
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* Initializes the dumping handle, grabs the statistic lock and appends
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* an empty TLV header to the socket buffer for use a container for all
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* other statistic TLVS.
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*
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* Returns 0 on success or -1 if the room in the socket buffer was not sufficient.
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*/
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int
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gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock,
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struct gnet_dump *d, int padattr)
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{
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return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d, padattr);
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}
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EXPORT_SYMBOL(gnet_stats_start_copy);
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static void
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__gnet_stats_copy_basic_cpu(struct gnet_stats_basic_packed *bstats,
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struct gnet_stats_basic_cpu __percpu *cpu)
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{
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int i;
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for_each_possible_cpu(i) {
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struct gnet_stats_basic_cpu *bcpu = per_cpu_ptr(cpu, i);
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unsigned int start;
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u64 bytes;
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u32 packets;
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do {
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start = u64_stats_fetch_begin_irq(&bcpu->syncp);
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bytes = bcpu->bstats.bytes;
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packets = bcpu->bstats.packets;
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} while (u64_stats_fetch_retry_irq(&bcpu->syncp, start));
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bstats->bytes += bytes;
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bstats->packets += packets;
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}
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}
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void
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__gnet_stats_copy_basic(const seqcount_t *running,
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struct gnet_stats_basic_packed *bstats,
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struct gnet_stats_basic_cpu __percpu *cpu,
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struct gnet_stats_basic_packed *b)
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{
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unsigned int seq;
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if (cpu) {
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__gnet_stats_copy_basic_cpu(bstats, cpu);
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return;
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}
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do {
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if (running)
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seq = read_seqcount_begin(running);
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bstats->bytes = b->bytes;
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bstats->packets = b->packets;
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} while (running && read_seqcount_retry(running, seq));
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}
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EXPORT_SYMBOL(__gnet_stats_copy_basic);
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static int
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___gnet_stats_copy_basic(const seqcount_t *running,
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struct gnet_dump *d,
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struct gnet_stats_basic_cpu __percpu *cpu,
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struct gnet_stats_basic_packed *b,
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int type)
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{
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struct gnet_stats_basic_packed bstats = {0};
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__gnet_stats_copy_basic(running, &bstats, cpu, b);
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if (d->compat_tc_stats && type == TCA_STATS_BASIC) {
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d->tc_stats.bytes = bstats.bytes;
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d->tc_stats.packets = bstats.packets;
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}
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if (d->tail) {
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struct gnet_stats_basic sb;
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memset(&sb, 0, sizeof(sb));
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sb.bytes = bstats.bytes;
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sb.packets = bstats.packets;
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return gnet_stats_copy(d, type, &sb, sizeof(sb),
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TCA_STATS_PAD);
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}
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return 0;
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}
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/**
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* gnet_stats_copy_basic - copy basic statistics into statistic TLV
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* @running: seqcount_t pointer
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* @d: dumping handle
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* @cpu: copy statistic per cpu
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* @b: basic statistics
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*
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* Appends the basic statistics to the top level TLV created by
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* gnet_stats_start_copy().
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*
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* Returns 0 on success or -1 with the statistic lock released
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* if the room in the socket buffer was not sufficient.
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*/
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int
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gnet_stats_copy_basic(const seqcount_t *running,
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struct gnet_dump *d,
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struct gnet_stats_basic_cpu __percpu *cpu,
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struct gnet_stats_basic_packed *b)
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{
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return ___gnet_stats_copy_basic(running, d, cpu, b,
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TCA_STATS_BASIC);
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}
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EXPORT_SYMBOL(gnet_stats_copy_basic);
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/**
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* gnet_stats_copy_basic_hw - copy basic hw statistics into statistic TLV
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* @running: seqcount_t pointer
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* @d: dumping handle
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* @cpu: copy statistic per cpu
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* @b: basic statistics
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*
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* Appends the basic statistics to the top level TLV created by
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* gnet_stats_start_copy().
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*
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* Returns 0 on success or -1 with the statistic lock released
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* if the room in the socket buffer was not sufficient.
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*/
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int
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gnet_stats_copy_basic_hw(const seqcount_t *running,
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struct gnet_dump *d,
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struct gnet_stats_basic_cpu __percpu *cpu,
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struct gnet_stats_basic_packed *b)
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{
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return ___gnet_stats_copy_basic(running, d, cpu, b,
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TCA_STATS_BASIC_HW);
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}
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EXPORT_SYMBOL(gnet_stats_copy_basic_hw);
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/**
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* gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV
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* @d: dumping handle
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* @rate_est: rate estimator
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*
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* Appends the rate estimator statistics to the top level TLV created by
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* gnet_stats_start_copy().
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*
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* Returns 0 on success or -1 with the statistic lock released
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* if the room in the socket buffer was not sufficient.
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*/
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int
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gnet_stats_copy_rate_est(struct gnet_dump *d,
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struct net_rate_estimator __rcu **rate_est)
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{
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struct gnet_stats_rate_est64 sample;
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struct gnet_stats_rate_est est;
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int res;
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if (!gen_estimator_read(rate_est, &sample))
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return 0;
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est.bps = min_t(u64, UINT_MAX, sample.bps);
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/* we have some time before reaching 2^32 packets per second */
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est.pps = sample.pps;
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if (d->compat_tc_stats) {
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d->tc_stats.bps = est.bps;
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d->tc_stats.pps = est.pps;
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}
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if (d->tail) {
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res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est),
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TCA_STATS_PAD);
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if (res < 0 || est.bps == sample.bps)
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return res;
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/* emit 64bit stats only if needed */
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return gnet_stats_copy(d, TCA_STATS_RATE_EST64, &sample,
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sizeof(sample), TCA_STATS_PAD);
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}
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return 0;
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}
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EXPORT_SYMBOL(gnet_stats_copy_rate_est);
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static void
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__gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats,
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const struct gnet_stats_queue __percpu *q)
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{
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int i;
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for_each_possible_cpu(i) {
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const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i);
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qstats->qlen = 0;
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qstats->backlog += qcpu->backlog;
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qstats->drops += qcpu->drops;
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qstats->requeues += qcpu->requeues;
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qstats->overlimits += qcpu->overlimits;
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}
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}
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void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats,
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const struct gnet_stats_queue __percpu *cpu,
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const struct gnet_stats_queue *q,
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__u32 qlen)
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{
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if (cpu) {
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__gnet_stats_copy_queue_cpu(qstats, cpu);
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} else {
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qstats->qlen = q->qlen;
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qstats->backlog = q->backlog;
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qstats->drops = q->drops;
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qstats->requeues = q->requeues;
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qstats->overlimits = q->overlimits;
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}
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qstats->qlen = qlen;
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}
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EXPORT_SYMBOL(__gnet_stats_copy_queue);
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/**
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* gnet_stats_copy_queue - copy queue statistics into statistics TLV
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* @d: dumping handle
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* @cpu_q: per cpu queue statistics
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* @q: queue statistics
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* @qlen: queue length statistics
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*
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* Appends the queue statistics to the top level TLV created by
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* gnet_stats_start_copy(). Using per cpu queue statistics if
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* they are available.
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*
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* Returns 0 on success or -1 with the statistic lock released
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* if the room in the socket buffer was not sufficient.
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*/
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int
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gnet_stats_copy_queue(struct gnet_dump *d,
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struct gnet_stats_queue __percpu *cpu_q,
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struct gnet_stats_queue *q, __u32 qlen)
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{
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struct gnet_stats_queue qstats = {0};
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__gnet_stats_copy_queue(&qstats, cpu_q, q, qlen);
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if (d->compat_tc_stats) {
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d->tc_stats.drops = qstats.drops;
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d->tc_stats.qlen = qstats.qlen;
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d->tc_stats.backlog = qstats.backlog;
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d->tc_stats.overlimits = qstats.overlimits;
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}
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if (d->tail)
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return gnet_stats_copy(d, TCA_STATS_QUEUE,
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&qstats, sizeof(qstats),
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TCA_STATS_PAD);
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return 0;
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}
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EXPORT_SYMBOL(gnet_stats_copy_queue);
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/**
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* gnet_stats_copy_app - copy application specific statistics into statistics TLV
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* @d: dumping handle
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* @st: application specific statistics data
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* @len: length of data
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*
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* Appends the application specific statistics to the top level TLV created by
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* gnet_stats_start_copy() and remembers the data for XSTATS if the dumping
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* handle is in backward compatibility mode.
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*
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* Returns 0 on success or -1 with the statistic lock released
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* if the room in the socket buffer was not sufficient.
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*/
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int
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gnet_stats_copy_app(struct gnet_dump *d, void *st, int len)
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{
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if (d->compat_xstats) {
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d->xstats = kmemdup(st, len, GFP_ATOMIC);
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if (!d->xstats)
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goto err_out;
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d->xstats_len = len;
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}
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if (d->tail)
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return gnet_stats_copy(d, TCA_STATS_APP, st, len,
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TCA_STATS_PAD);
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return 0;
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err_out:
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if (d->lock)
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spin_unlock_bh(d->lock);
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d->xstats_len = 0;
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return -1;
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}
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EXPORT_SYMBOL(gnet_stats_copy_app);
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/**
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* gnet_stats_finish_copy - finish dumping procedure
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* @d: dumping handle
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*
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* Corrects the length of the top level TLV to include all TLVs added
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* by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs
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* if gnet_stats_start_copy_compat() was used and releases the statistics
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* lock.
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*
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* Returns 0 on success or -1 with the statistic lock released
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* if the room in the socket buffer was not sufficient.
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*/
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int
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gnet_stats_finish_copy(struct gnet_dump *d)
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{
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if (d->tail)
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d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
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if (d->compat_tc_stats)
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if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,
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sizeof(d->tc_stats), d->padattr) < 0)
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return -1;
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if (d->compat_xstats && d->xstats) {
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if (gnet_stats_copy(d, d->compat_xstats, d->xstats,
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d->xstats_len, d->padattr) < 0)
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return -1;
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}
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if (d->lock)
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spin_unlock_bh(d->lock);
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kfree(d->xstats);
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d->xstats = NULL;
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d->xstats_len = 0;
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return 0;
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}
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EXPORT_SYMBOL(gnet_stats_finish_copy);
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