1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* ar-skbuff.c: socket buffer destruction handling 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(op) (op >= rxrpc_skb_tx_cleaned ? &rxrpc_n_tx_skbs : &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 op) 23 { 24 const void *here = __builtin_return_address(0); 25 int n = atomic_inc_return(select_skb_count(op)); 26 trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here); 27 } 28 29 /* 30 * Note the re-emergence of a socket buffer from a queue or buffer. 31 */ 32 void rxrpc_see_skb(struct sk_buff *skb, enum rxrpc_skb_trace op) 33 { 34 const void *here = __builtin_return_address(0); 35 if (skb) { 36 int n = atomic_read(select_skb_count(op)); 37 trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here); 38 } 39 } 40 41 /* 42 * Note the addition of a ref on a socket buffer. 43 */ 44 void rxrpc_get_skb(struct sk_buff *skb, enum rxrpc_skb_trace op) 45 { 46 const void *here = __builtin_return_address(0); 47 int n = atomic_inc_return(select_skb_count(op)); 48 trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here); 49 skb_get(skb); 50 } 51 52 /* 53 * Note the destruction of a socket buffer. 54 */ 55 void rxrpc_free_skb(struct sk_buff *skb, enum rxrpc_skb_trace op) 56 { 57 const void *here = __builtin_return_address(0); 58 if (skb) { 59 int n; 60 CHECK_SLAB_OKAY(&skb->users); 61 n = atomic_dec_return(select_skb_count(op)); 62 trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here); 63 kfree_skb(skb); 64 } 65 } 66 67 /* 68 * Clear a queue of socket buffers. 69 */ 70 void rxrpc_purge_queue(struct sk_buff_head *list) 71 { 72 const void *here = __builtin_return_address(0); 73 struct sk_buff *skb; 74 while ((skb = skb_dequeue((list))) != NULL) { 75 int n = atomic_dec_return(select_skb_count(rxrpc_skb_rx_purged)); 76 trace_rxrpc_skb(skb, rxrpc_skb_rx_purged, 77 refcount_read(&skb->users), n, here); 78 kfree_skb(skb); 79 } 80 } 81