1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* ar-skbuff.c: socket buffer destruction handling
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10 #include <linux/module.h>
11 #include <linux/net.h>
12 #include <linux/skbuff.h>
14 #include <net/af_rxrpc.h>
15 #include "ar-internal.h"
17 #define is_tx_skb(skb) (rxrpc_skb(skb)->rx_flags & RXRPC_SKB_TX_BUFFER)
18 #define select_skb_count(skb) (is_tx_skb(skb) ? &rxrpc_n_tx_skbs : &rxrpc_n_rx_skbs)
21 * Note the allocation or reception of a socket buffer.
23 void rxrpc_new_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
25 const void *here = __builtin_return_address(0);
26 int n = atomic_inc_return(select_skb_count(skb));
27 trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here);
31 * Note the re-emergence of a socket buffer from a queue or buffer.
33 void rxrpc_see_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
35 const void *here = __builtin_return_address(0);
37 int n = atomic_read(select_skb_count(skb));
38 trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here);
43 * Note the addition of a ref on a socket buffer.
45 void rxrpc_get_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
47 const void *here = __builtin_return_address(0);
48 int n = atomic_inc_return(select_skb_count(skb));
49 trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here);
54 * Note the destruction of a socket buffer.
56 void rxrpc_free_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
58 const void *here = __builtin_return_address(0);
61 CHECK_SLAB_OKAY(&skb->users);
62 n = atomic_dec_return(select_skb_count(skb));
63 trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here);
69 * Clear a queue of socket buffers.
71 void rxrpc_purge_queue(struct sk_buff_head *list)
73 const void *here = __builtin_return_address(0);
75 while ((skb = skb_dequeue((list))) != NULL) {
76 int n = atomic_dec_return(select_skb_count(skb));
77 trace_rxrpc_skb(skb, rxrpc_skb_purged,
78 refcount_read(&skb->users), n, here);