skbuff.c
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/* ar-skbuff.c: socket buffer destruction handling
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include "ar-internal.h"
#define select_skb_count(op) (op >= rxrpc_skb_tx_cleaned ? &rxrpc_n_tx_skbs : &rxrpc_n_rx_skbs)
/*
* Note the allocation or reception of a socket buffer.
*/
void rxrpc_new_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
{
const void *here = __builtin_return_address(0);
int n = atomic_inc_return(select_skb_count(op));
trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here);
}
/*
* Note the re-emergence of a socket buffer from a queue or buffer.
*/
void rxrpc_see_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
{
const void *here = __builtin_return_address(0);
if (skb) {
int n = atomic_read(select_skb_count(op));
trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here);
}
}
/*
* Note the addition of a ref on a socket buffer.
*/
void rxrpc_get_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
{
const void *here = __builtin_return_address(0);
int n = atomic_inc_return(select_skb_count(op));
trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here);
skb_get(skb);
}
/*
* Note the destruction of a socket buffer.
*/
void rxrpc_free_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
{
const void *here = __builtin_return_address(0);
if (skb) {
int n;
CHECK_SLAB_OKAY(&skb->users);
n = atomic_dec_return(select_skb_count(op));
trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here);
kfree_skb(skb);
}
}
/*
* Note the injected loss of a socket buffer.
*/
void rxrpc_lose_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
{
const void *here = __builtin_return_address(0);
if (skb) {
int n;
CHECK_SLAB_OKAY(&skb->users);
n = atomic_dec_return(select_skb_count(op));
trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n, here);
kfree_skb(skb);
}
}
/*
* Clear a queue of socket buffers.
*/
void rxrpc_purge_queue(struct sk_buff_head *list)
{
const void *here = __builtin_return_address(0);
struct sk_buff *skb;
while ((skb = skb_dequeue((list))) != NULL) {
int n = atomic_dec_return(select_skb_count(rxrpc_skb_rx_purged));
trace_rxrpc_skb(skb, rxrpc_skb_rx_purged,
refcount_read(&skb->users), n, here);
kfree_skb(skb);
}
}