Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * net/core/gen_stats.c
 *
 * Authors:  Thomas Graf <tgraf@suug.ch>
 *           Jamal Hadi Salim
 *           Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 * See Documentation/networking/gen_stats.rst
 */
 
#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, 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);
 
static 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,
<------><------><------> int type)
{
<------>struct gnet_stats_basic_packed bstats = {0};
 
<------>__gnet_stats_copy_basic(running, &bstats, cpu, b);
 
<------>if (d->compat_tc_stats && type == TCA_STATS_BASIC) {
<------><------>d->tc_stats.bytes = bstats.bytes;
<------><------>d->tc_stats.packets = bstats.packets;
<------>}
 
<------>if (d->tail) {
<------><------>struct gnet_stats_basic sb;
<------><------>int res;
 
<------><------>memset(&sb, 0, sizeof(sb));
<------><------>sb.bytes = bstats.bytes;
<------><------>sb.packets = bstats.packets;
<------><------>res = gnet_stats_copy(d, type, &sb, sizeof(sb), TCA_STATS_PAD);
<------><------>if (res < 0 || sb.packets == bstats.packets)
<------><------><------>return res;
<------><------>/* emit 64bit stats only if needed */
<------><------>return gnet_stats_copy(d, TCA_STATS_PKT64, &bstats.packets,
<------><------><------><------>       sizeof(bstats.packets), TCA_STATS_PAD);
<------>}
<------>return 0;
}
 
/**
 * 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)
{
<------>return ___gnet_stats_copy_basic(running, d, cpu, b,
<------><------><------><------><------>TCA_STATS_BASIC);
}
EXPORT_SYMBOL(gnet_stats_copy_basic);
 
/**
 * gnet_stats_copy_basic_hw - copy basic hw 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_hw(const seqcount_t *running,
<------><------><------> struct gnet_dump *d,
<------><------><------> struct gnet_stats_basic_cpu __percpu *cpu,
<------><------><------> struct gnet_stats_basic_packed *b)
{
<------>return ___gnet_stats_copy_basic(running, d, cpu, b,
<------><------><------><------><------>TCA_STATS_BASIC_HW);
}
EXPORT_SYMBOL(gnet_stats_copy_basic_hw);
 
/**
 * 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;
<------>}
}
 
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;
}
EXPORT_SYMBOL(__gnet_stats_copy_queue);
 
/**
 * 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);