skbuff_ref.h

 1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 *	Skb ref helpers.
 4 *
 5 */
 6
 7#ifndef _LINUX_SKBUFF_REF_H
 8#define _LINUX_SKBUFF_REF_H
 9
10#include <linux/skbuff.h>
11
12/**
13 * __skb_frag_ref - take an addition reference on a paged fragment.
14 * @frag: the paged fragment
15 *
16 * Takes an additional reference on the paged fragment @frag.
17 */
18static inline void __skb_frag_ref(skb_frag_t *frag)
19{
20	get_netmem(skb_frag_netmem(frag));
21}
22
23/**
24 * skb_frag_ref - take an addition reference on a paged fragment of an skb.
25 * @skb: the buffer
26 * @f: the fragment offset.
27 *
28 * Takes an additional reference on the @f'th paged fragment of @skb.
29 */
30static inline void skb_frag_ref(struct sk_buff *skb, int f)
31{
32	__skb_frag_ref(&skb_shinfo(skb)->frags[f]);
33}
34
35bool napi_pp_put_page(netmem_ref netmem);
36
37static inline void skb_page_unref(netmem_ref netmem, bool recycle)
38{
39#ifdef CONFIG_PAGE_POOL
40	if (recycle && napi_pp_put_page(netmem))
41		return;
42#endif
43	put_netmem(netmem);
44}
45
46/**
47 * __skb_frag_unref - release a reference on a paged fragment.
48 * @frag: the paged fragment
49 * @recycle: recycle the page if allocated via page_pool
50 *
51 * Releases a reference on the paged fragment @frag
52 * or recycles the page via the page_pool API.
53 */
54static inline void __skb_frag_unref(skb_frag_t *frag, bool recycle)
55{
56	skb_page_unref(skb_frag_netmem(frag), recycle);
57}
58
59/**
60 * skb_frag_unref - release a reference on a paged fragment of an skb.
61 * @skb: the buffer
62 * @f: the fragment offset
63 *
64 * Releases a reference on the @f'th paged fragment of @skb.
65 */
66static inline void skb_frag_unref(struct sk_buff *skb, int f)
67{
68	struct skb_shared_info *shinfo = skb_shinfo(skb);
69
70	if (!skb_zcopy_managed(skb))
71		__skb_frag_unref(&shinfo->frags[f], skb->pp_recycle);
72}
73
74#endif	/* _LINUX_SKBUFF_REF_H */