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 */
18 static inline void __skb_frag_ref(skb_frag_t *frag)
19 {
20 get_page(skb_frag_page(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 */
30 static inline void skb_frag_ref(struct sk_buff *skb, int f)
31 {
32 __skb_frag_ref(&skb_shinfo(skb)->frags[f]);
33 }
34
35 bool napi_pp_put_page(netmem_ref netmem);
36
37 static inline void
38 skb_page_unref(struct page *page, bool recycle)
39 {
40 #ifdef CONFIG_PAGE_POOL
41 if (recycle && napi_pp_put_page(page_to_netmem(page)))
42 return;
43 #endif
44 put_page(page);
45 }
46
47 /**
48 * __skb_frag_unref - release a reference on a paged fragment.
49 * @frag: the paged fragment
50 * @recycle: recycle the page if allocated via page_pool
51 *
52 * Releases a reference on the paged fragment @frag
53 * or recycles the page via the page_pool API.
54 */
55 static inline void __skb_frag_unref(skb_frag_t *frag, bool recycle)
56 {
57 skb_page_unref(skb_frag_page(frag), recycle);
58 }
59
60 /**
61 * skb_frag_unref - release a reference on a paged fragment of an skb.
62 * @skb: the buffer
63 * @f: the fragment offset
64 *
65 * Releases a reference on the @f'th paged fragment of @skb.
66 */
67 static inline void skb_frag_unref(struct sk_buff *skb, int f)
68 {
69 struct skb_shared_info *shinfo = skb_shinfo(skb);
70
71 if (!skb_zcopy_managed(skb))
72 __skb_frag_unref(&shinfo->frags[f], skb->pp_recycle);
73 }
74
75 #endif /* _LINUX_SKBUFF_REF_H */
76
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