| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
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| 2 | /* |
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| 3 | * Skb ref helpers. |
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| 4 | * |
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| 5 | */ |
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| 6 | |
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| 7 | #ifndef _LINUX_SKBUFF_REF_H |
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| 8 | #define _LINUX_SKBUFF_REF_H |
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| 9 | |
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| 10 | #include <linux/skbuff.h> |
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| 11 | |
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| 12 | /** |
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| 13 | * __skb_frag_ref - take an addition reference on a paged fragment. |
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| 14 | * @frag: the paged fragment |
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| 15 | * |
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| 16 | * Takes an additional reference on the paged fragment @frag. |
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| 17 | */ |
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| 18 | static inline void __skb_frag_ref(skb_frag_t *frag) |
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| 19 | { |
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| 20 | get_netmem(netmem: skb_frag_netmem(frag)); |
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| 21 | } |
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| 22 | |
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| 23 | /** |
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| 24 | * skb_frag_ref - take an addition reference on a paged fragment of an skb. |
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| 25 | * @skb: the buffer |
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| 26 | * @f: the fragment offset. |
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| 27 | * |
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| 28 | * Takes an additional reference on the @f'th paged fragment of @skb. |
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| 29 | */ |
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| 30 | static inline void skb_frag_ref(struct sk_buff *skb, int f) |
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| 31 | { |
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| 32 | __skb_frag_ref(frag: &skb_shinfo(skb)->frags[f]); |
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| 33 | } |
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| 34 | |
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| 35 | bool napi_pp_put_page(netmem_ref netmem); |
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| 36 | |
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| 37 | static inline void skb_page_unref(netmem_ref netmem, bool recycle) |
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| 38 | { |
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| 39 | #ifdef CONFIG_PAGE_POOL |
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| 40 | if (recycle && napi_pp_put_page(netmem)) |
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| 41 | return; |
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| 42 | #endif |
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| 43 | put_netmem(netmem); |
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| 44 | } |
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| 45 | |
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| 46 | /** |
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| 47 | * __skb_frag_unref - release a reference on a paged fragment. |
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| 48 | * @frag: the paged fragment |
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| 49 | * @recycle: recycle the page if allocated via page_pool |
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| 50 | * |
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| 51 | * Releases a reference on the paged fragment @frag |
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| 52 | * or recycles the page via the page_pool API. |
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| 53 | */ |
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| 54 | static inline void __skb_frag_unref(skb_frag_t *frag, bool recycle) |
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| 55 | { |
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| 56 | skb_page_unref(netmem: skb_frag_netmem(frag), recycle); |
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| 57 | } |
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| 58 | |
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| 59 | /** |
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| 60 | * skb_frag_unref - release a reference on a paged fragment of an skb. |
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| 61 | * @skb: the buffer |
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| 62 | * @f: the fragment offset |
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| 63 | * |
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| 64 | * Releases a reference on the @f'th paged fragment of @skb. |
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| 65 | */ |
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| 66 | static inline void skb_frag_unref(struct sk_buff *skb, int f) |
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| 67 | { |
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| 68 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
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| 69 | |
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| 70 | if (!skb_zcopy_managed(skb)) |
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| 71 | __skb_frag_unref(frag: &shinfo->frags[f], recycle: skb->pp_recycle); |
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| 72 | } |
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| 73 | |
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| 74 | #endif /* _LINUX_SKBUFF_REF_H */ |
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| 75 | |
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