96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
/* ar-skbuff.c: socket buffer destruction handling
|
||
|
|
*
|
||
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
||
|
|
* Written by David Howells (dhowells@redhat.com)
|
||
|
|
*/
|
||
|
|
|
||
|
|
#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 is_tx_skb(skb) (rxrpc_skb(skb)->rx_flags & RXRPC_SKB_TX_BUFFER)
|
||
|
|
#define select_skb_count(skb) (is_tx_skb(skb) ? &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(skb));
|
||
|
|
trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
|
||
|
|
rxrpc_skb(skb)->rx_flags, 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(skb));
|
||
|
|
trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
|
||
|
|
rxrpc_skb(skb)->rx_flags, 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(skb));
|
||
|
|
trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
|
||
|
|
rxrpc_skb(skb)->rx_flags, here);
|
||
|
|
skb_get(skb);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Note the dropping of a ref on a socket buffer by the core.
|
||
|
|
*/
|
||
|
|
void rxrpc_eaten_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
|
||
|
|
{
|
||
|
|
const void *here = __builtin_return_address(0);
|
||
|
|
int n = atomic_inc_return(&rxrpc_n_rx_skbs);
|
||
|
|
trace_rxrpc_skb(skb, op, 0, n, 0, here);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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;
|
||
|
|
n = atomic_dec_return(select_skb_count(skb));
|
||
|
|
trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
|
||
|
|
rxrpc_skb(skb)->rx_flags, 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(skb));
|
||
|
|
trace_rxrpc_skb(skb, rxrpc_skb_purged,
|
||
|
|
refcount_read(&skb->users), n,
|
||
|
|
rxrpc_skb(skb)->rx_flags, here);
|
||
|
|
kfree_skb(skb);
|
||
|
|
}
|
||
|
|
}
|