97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* ar-skbuff.c: socket buffer destruction handling
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include "ar-internal.h"
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#define is_tx_skb(skb) (rxrpc_skb(skb)->rx_flags & RXRPC_SKB_TX_BUFFER)
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#define select_skb_count(skb) (is_tx_skb(skb) ? &rxrpc_n_tx_skbs : &rxrpc_n_rx_skbs)
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/*
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* Note the allocation or reception of a socket buffer.
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*/
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void rxrpc_new_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
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{
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const void *here = __builtin_return_address(0);
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int n = atomic_inc_return(select_skb_count(skb));
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trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
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rxrpc_skb(skb)->rx_flags, here);
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}
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/*
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* Note the re-emergence of a socket buffer from a queue or buffer.
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*/
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void rxrpc_see_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
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{
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const void *here = __builtin_return_address(0);
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if (skb) {
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int n = atomic_read(select_skb_count(skb));
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trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
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rxrpc_skb(skb)->rx_flags, here);
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}
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}
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/*
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* Note the addition of a ref on a socket buffer.
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*/
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void rxrpc_get_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
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{
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const void *here = __builtin_return_address(0);
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int n = atomic_inc_return(select_skb_count(skb));
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trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
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rxrpc_skb(skb)->rx_flags, here);
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skb_get(skb);
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}
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/*
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* Note the dropping of a ref on a socket buffer by the core.
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*/
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void rxrpc_eaten_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
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{
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const void *here = __builtin_return_address(0);
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int n = atomic_inc_return(&rxrpc_n_rx_skbs);
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trace_rxrpc_skb(skb, op, 0, n, 0, here);
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}
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/*
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* Note the destruction of a socket buffer.
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*/
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void rxrpc_free_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
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{
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const void *here = __builtin_return_address(0);
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if (skb) {
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int n;
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CHECK_SLAB_OKAY(&skb->users);
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n = atomic_dec_return(select_skb_count(skb));
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trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
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rxrpc_skb(skb)->rx_flags, here);
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kfree_skb(skb);
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}
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}
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/*
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* Clear a queue of socket buffers.
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*/
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void rxrpc_purge_queue(struct sk_buff_head *list)
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{
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const void *here = __builtin_return_address(0);
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struct sk_buff *skb;
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while ((skb = skb_dequeue((list))) != NULL) {
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int n = atomic_dec_return(select_skb_count(skb));
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trace_rxrpc_skb(skb, rxrpc_skb_purged,
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refcount_read(&skb->users), n,
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rxrpc_skb(skb)->rx_flags, here);
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kfree_skb(skb);
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}
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}
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