1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Socket buffer accounting
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/module.h>
11#include <linux/net.h>
12#include <linux/skbuff.h>
13#include <net/sock.h>
14#include <net/af_rxrpc.h>
15#include "ar-internal.h"
16
17#define select_skb_count(skb) (&rxrpc_n_rx_skbs)
18
19/*
20 * Note the allocation or reception of a socket buffer.
21 */
22void rxrpc_new_skb(struct sk_buff *skb, enum rxrpc_skb_trace why)
23{
24 int n = atomic_inc_return(select_skb_count(skb));
25 trace_rxrpc_skb(skb, usage: refcount_read(r: &skb->users), mod_count: n, why);
26}
27
28/*
29 * Note the re-emergence of a socket buffer from a queue or buffer.
30 */
31void rxrpc_see_skb(struct sk_buff *skb, enum rxrpc_skb_trace why)
32{
33 if (skb) {
34 int n = atomic_read(select_skb_count(skb));
35 trace_rxrpc_skb(skb, usage: refcount_read(r: &skb->users), mod_count: n, why);
36 }
37}
38
39/*
40 * Note the addition of a ref on a socket buffer.
41 */
42void rxrpc_get_skb(struct sk_buff *skb, enum rxrpc_skb_trace why)
43{
44 int n = atomic_inc_return(select_skb_count(skb));
45 trace_rxrpc_skb(skb, usage: refcount_read(r: &skb->users), mod_count: n, why);
46 skb_get(skb);
47}
48
49/*
50 * Note the dropping of a ref on a socket buffer by the core.
51 */
52void rxrpc_eaten_skb(struct sk_buff *skb, enum rxrpc_skb_trace why)
53{
54 int n = atomic_inc_return(v: &rxrpc_n_rx_skbs);
55 trace_rxrpc_skb(skb, usage: 0, mod_count: n, why);
56}
57
58/*
59 * Note the destruction of a socket buffer.
60 */
61void rxrpc_free_skb(struct sk_buff *skb, enum rxrpc_skb_trace why)
62{
63 if (skb) {
64 int n = atomic_dec_return(select_skb_count(skb));
65 trace_rxrpc_skb(skb, usage: refcount_read(r: &skb->users), mod_count: n, why);
66 consume_skb(skb);
67 }
68}
69
70/*
71 * Clear a queue of socket buffers.
72 */
73void rxrpc_purge_queue(struct sk_buff_head *list)
74{
75 struct sk_buff *skb;
76
77 while ((skb = skb_dequeue((list))) != NULL) {
78 int n = atomic_dec_return(select_skb_count(skb));
79 trace_rxrpc_skb(skb, usage: refcount_read(r: &skb->users), mod_count: n,
80 why: rxrpc_skb_put_purge);
81 consume_skb(skb);
82 }
83}
84

source code of linux/net/rxrpc/skbuff.c