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 */
22 void 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, refcount_read(&skb->users), n, why);
26 }
27
28 /*
29 * Note the re-emergence of a socket buffer from a queue or buffer.
30 */
31 void 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, refcount_read(&skb->users), n, why);
36 }
37 }
38
39 /*
40 * Note the addition of a ref on a socket buffer.
41 */
42 void 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, refcount_read(&skb->users), n, why);
46 skb_get(skb);
47 }
48
49 /*
50 * Note the dropping of a ref on a socket buffer by the core.
51 */
52 void rxrpc_eaten_skb(struct sk_buff *skb, enum rxrpc_skb_trace why)
53 {
54 int n = atomic_inc_return(&rxrpc_n_rx_skbs);
55 trace_rxrpc_skb(skb, 0, n, why);
56 }
57
58 /*
59 * Note the destruction of a socket buffer.
60 */
61 void 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, refcount_read(&skb->users), n, why);
66 consume_skb(skb);
67 }
68 }
69
70 /*
71 * Clear a queue of socket buffers.
72 */
73 void 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, refcount_read(&skb->users), n,
80 rxrpc_skb_put_purge);
81 consume_skb(skb);
82 }
83 }
84
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