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17926a79 DH |
1 | /* ar-skbuff.c: socket buffer destruction handling |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
9b6d5398 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
17926a79 DH |
14 | #include <linux/module.h> |
15 | #include <linux/net.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <net/sock.h> | |
18 | #include <net/af_rxrpc.h> | |
19 | #include "ar-internal.h" | |
20 | ||
df844fd4 DH |
21 | /* |
22 | * Note the existence of a new-to-us socket buffer (allocated or dequeued). | |
23 | */ | |
24 | void rxrpc_new_skb(struct sk_buff *skb) | |
25 | { | |
26 | const void *here = __builtin_return_address(0); | |
27 | int n = atomic_inc_return(&rxrpc_n_skbs); | |
28 | trace_rxrpc_skb(skb, 0, atomic_read(&skb->users), n, here); | |
29 | } | |
30 | ||
31 | /* | |
32 | * Note the re-emergence of a socket buffer from a queue or buffer. | |
33 | */ | |
34 | void rxrpc_see_skb(struct sk_buff *skb) | |
35 | { | |
36 | const void *here = __builtin_return_address(0); | |
37 | if (skb) { | |
38 | int n = atomic_read(&rxrpc_n_skbs); | |
39 | trace_rxrpc_skb(skb, 1, atomic_read(&skb->users), n, here); | |
40 | } | |
41 | } | |
42 | ||
43 | /* | |
44 | * Note the addition of a ref on a socket buffer. | |
45 | */ | |
46 | void rxrpc_get_skb(struct sk_buff *skb) | |
47 | { | |
48 | const void *here = __builtin_return_address(0); | |
49 | int n = atomic_inc_return(&rxrpc_n_skbs); | |
50 | trace_rxrpc_skb(skb, 2, atomic_read(&skb->users), n, here); | |
51 | skb_get(skb); | |
52 | } | |
53 | ||
54 | /* | |
55 | * Note the destruction of a socket buffer. | |
56 | */ | |
57 | void rxrpc_free_skb(struct sk_buff *skb) | |
58 | { | |
59 | const void *here = __builtin_return_address(0); | |
60 | if (skb) { | |
61 | int n; | |
62 | CHECK_SLAB_OKAY(&skb->users); | |
63 | n = atomic_dec_return(&rxrpc_n_skbs); | |
64 | trace_rxrpc_skb(skb, 3, atomic_read(&skb->users), n, here); | |
65 | kfree_skb(skb); | |
66 | } | |
67 | } | |
68 | ||
69 | /* | |
70 | * Clear a queue of socket buffers. | |
71 | */ | |
72 | void rxrpc_purge_queue(struct sk_buff_head *list) | |
73 | { | |
74 | const void *here = __builtin_return_address(0); | |
75 | struct sk_buff *skb; | |
76 | while ((skb = skb_dequeue((list))) != NULL) { | |
77 | int n = atomic_dec_return(&rxrpc_n_skbs); | |
78 | trace_rxrpc_skb(skb, 4, atomic_read(&skb->users), n, here); | |
79 | kfree_skb(skb); | |
80 | } | |
81 | } |