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_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 */ 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(struct page *page); 36 37static inline void 38skb_page_unref(struct page *page, bool recycle) 39{ 40#ifdef CONFIG_PAGE_POOL 41 if (recycle && napi_pp_put_page(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 */ 55static 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 */ 67static 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