From patchwork Wed Jul 19 12:13:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yunsheng Lin X-Patchwork-Id: 13318878 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 369F9EB64DA for ; Wed, 19 Jul 2023 12:16:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:Message-ID:Date:Subject:CC:To:From: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=dWplfl9Z/xbPRntVftpIHcvQh8CpVdiwdnc5Px0xohI=; b=4dE+REOeWR/WB9DruHVY7dhCG1 92Zhcm24x6xel80jOrdV0NzXah7EwdHShOD7RcXR/j4T9uq+NF9vP4fOD96SPT/7YhIeebwrxEPM9 L4Dzy5QwofoEpWSgSwshmfCj5mwOI3LTPnFcXN702tod/FupT2xbwHiPo+e4e5RjKB10eev+1hrVV GNDjkjw747rS1xHn0BS0Otbz3tk1N1QZ8SvdiVTjjCyZntjcnnp5cy/yQwYDlZnPVfu7RGzbZKsvv FjR0CeoLerppgMVkzJc9kaBL+YSSZoSHybiM69ectprQznVkR3hBjPKoxt3RQ2kf7j51t9oaf/CHg fLAf03sg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qM66e-007Ndw-38; Wed, 19 Jul 2023 12:16:37 +0000 Received: from szxga02-in.huawei.com ([45.249.212.188]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qM66X-007NaY-2d; Wed, 19 Jul 2023 12:16:33 +0000 Received: from dggpemm500005.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4R5ZTR4qyCzNmFW; Wed, 19 Jul 2023 20:12:59 +0800 (CST) Received: from localhost.localdomain (10.69.192.56) by dggpemm500005.china.huawei.com (7.185.36.74) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Wed, 19 Jul 2023 20:16:19 +0800 From: Yunsheng Lin To: , , CC: , , Yunsheng Lin , Alexander Lobakin , Eric Dumazet , Wei Fang , Shenwei Wang , Clark Wang , NXP Linux Team , Sunil Goutham , Geetha sowjanya , Subbaraya Sundeep , hariprasad , Saeed Mahameed , Leon Romanovsky , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Felix Fietkau , Lorenzo Bianconi , Ryder Lee , Shayne Chen , Sean Wang , Kalle Valo , Matthias Brugger , AngeloGioacchino Del Regno , Ilias Apalodimas , , , , , Subject: [PATCH net-next] page_pool: split types and declarations from page_pool.h Date: Wed, 19 Jul 2023 20:13:37 +0800 Message-ID: <20230719121339.63331-1-linyunsheng@huawei.com> X-Mailer: git-send-email 2.33.0 MIME-Version: 1.0 X-Originating-IP: [10.69.192.56] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To dggpemm500005.china.huawei.com (7.185.36.74) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230719_051630_709648_955077B9 X-CRM114-Status: GOOD ( 25.94 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org Split types and pure function declarations from page_pool.h and add them in page_page_types.h, so that C sources can include page_pool.h and headers should generally only include page_pool_types.h as suggested by jakub. Signed-off-by: Yunsheng Lin Suggested-by: Jakub Kicinski CC: Alexander Lobakin --- MAINTAINERS | 1 + drivers/net/ethernet/engleder/tsnep_main.c | 1 + drivers/net/ethernet/freescale/fec_main.c | 1 + .../marvell/octeontx2/nic/otx2_common.c | 1 + .../ethernet/marvell/octeontx2/nic/otx2_pf.c | 1 + .../ethernet/mellanox/mlx5/core/en/params.c | 1 + .../net/ethernet/mellanox/mlx5/core/en/xdp.c | 1 + drivers/net/wireless/mediatek/mt76/mt76.h | 1 + include/linux/skbuff.h | 2 +- include/net/page_pool.h | 193 +----------------- include/net/page_pool_types.h | 193 ++++++++++++++++++ 11 files changed, 206 insertions(+), 190 deletions(-) create mode 100644 include/net/page_pool_types.h diff --git a/MAINTAINERS b/MAINTAINERS index 9a5863f1b016..2888d63e6e03 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16003,6 +16003,7 @@ L: netdev@vger.kernel.org S: Supported F: Documentation/networking/page_pool.rst F: include/net/page_pool.h +F: include/net/page_pool_types.h F: include/trace/events/page_pool.h F: net/core/page_pool.c diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c index 84751bb303a6..6222aaa5157f 100644 --- a/drivers/net/ethernet/engleder/tsnep_main.c +++ b/drivers/net/ethernet/engleder/tsnep_main.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #define TSNEP_RX_OFFSET (max(NET_SKB_PAD, XDP_PACKET_HEADROOM) + NET_IP_ALIGN) diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index 1b990a486059..cfc07f012254 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -38,6 +38,7 @@ #include #include #include +#include #include #include #include diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c index 77c8f650f7ac..b5385ae65dcb 100644 --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c @@ -7,6 +7,7 @@ #include #include +#include #include #include diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c index fe8ea4e531b7..7eca434a0550 100644 --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c @@ -16,6 +16,7 @@ #include #include #include +#include #include "otx2_reg.h" #include "otx2_common.h" diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c index 5ce28ff7685f..0f152f14165b 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c @@ -6,6 +6,7 @@ #include "en/port.h" #include "en_accel/en_accel.h" #include "en_accel/ipsec.h" +#include #include static u8 mlx5e_mpwrq_min_page_shift(struct mlx5_core_dev *mdev) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c index 40589cebb773..16038c23b7d8 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c @@ -35,6 +35,7 @@ #include "en/xdp.h" #include "en/params.h" #include +#include int mlx5e_xdp_max_mtu(struct mlx5e_params *params, struct mlx5e_xsk_param *xsk) { diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h index 6b07b8fafec2..95c16f11d156 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76.h +++ b/drivers/net/wireless/mediatek/mt76/mt76.h @@ -15,6 +15,7 @@ #include #include #include +#include #include "util.h" #include "testmode.h" diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 91ed66952580..bc4a7d45365b 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -32,7 +32,7 @@ #include #include #include -#include +#include #if IS_ENABLED(CONFIG_NF_CONNTRACK) #include #endif diff --git a/include/net/page_pool.h b/include/net/page_pool.h index 126f9e294389..bee12295d729 100644 --- a/include/net/page_pool.h +++ b/include/net/page_pool.h @@ -30,107 +30,9 @@ #ifndef _NET_PAGE_POOL_H #define _NET_PAGE_POOL_H -#include /* Needed by ptr_ring */ -#include -#include - -#define PP_FLAG_DMA_MAP BIT(0) /* Should page_pool do the DMA - * map/unmap - */ -#define PP_FLAG_DMA_SYNC_DEV BIT(1) /* If set all pages that the driver gets - * from page_pool will be - * DMA-synced-for-device according to - * the length provided by the device - * driver. - * Please note DMA-sync-for-CPU is still - * device driver responsibility - */ -#define PP_FLAG_PAGE_FRAG BIT(2) /* for page frag feature */ -#define PP_FLAG_ALL (PP_FLAG_DMA_MAP |\ - PP_FLAG_DMA_SYNC_DEV |\ - PP_FLAG_PAGE_FRAG) - -/* - * Fast allocation side cache array/stack - * - * The cache size and refill watermark is related to the network - * use-case. The NAPI budget is 64 packets. After a NAPI poll the RX - * ring is usually refilled and the max consumed elements will be 64, - * thus a natural max size of objects needed in the cache. - * - * Keeping room for more objects, is due to XDP_DROP use-case. As - * XDP_DROP allows the opportunity to recycle objects directly into - * this array, as it shares the same softirq/NAPI protection. If - * cache is already full (or partly full) then the XDP_DROP recycles - * would have to take a slower code path. - */ -#define PP_ALLOC_CACHE_SIZE 128 -#define PP_ALLOC_CACHE_REFILL 64 -struct pp_alloc_cache { - u32 count; - struct page *cache[PP_ALLOC_CACHE_SIZE]; -}; - -struct page_pool_params { - unsigned int flags; - unsigned int order; - unsigned int pool_size; - int nid; /* Numa node id to allocate from pages from */ - struct device *dev; /* device, for DMA pre-mapping purposes */ - struct napi_struct *napi; /* Sole consumer of pages, otherwise NULL */ - enum dma_data_direction dma_dir; /* DMA mapping direction */ - unsigned int max_len; /* max DMA sync memory size */ - unsigned int offset; /* DMA addr offset */ - void (*init_callback)(struct page *page, void *arg); - void *init_arg; -}; - -#ifdef CONFIG_PAGE_POOL_STATS -struct page_pool_alloc_stats { - u64 fast; /* fast path allocations */ - u64 slow; /* slow-path order 0 allocations */ - u64 slow_high_order; /* slow-path high order allocations */ - u64 empty; /* failed refills due to empty ptr ring, forcing - * slow path allocation - */ - u64 refill; /* allocations via successful refill */ - u64 waive; /* failed refills due to numa zone mismatch */ -}; - -struct page_pool_recycle_stats { - u64 cached; /* recycling placed page in the cache. */ - u64 cache_full; /* cache was full */ - u64 ring; /* recycling placed page back into ptr ring */ - u64 ring_full; /* page was released from page-pool because - * PTR ring was full. - */ - u64 released_refcnt; /* page released because of elevated - * refcnt - */ -}; - -/* This struct wraps the above stats structs so users of the - * page_pool_get_stats API can pass a single argument when requesting the - * stats for the page pool. - */ -struct page_pool_stats { - struct page_pool_alloc_stats alloc_stats; - struct page_pool_recycle_stats recycle_stats; -}; - -int page_pool_ethtool_stats_get_count(void); -u8 *page_pool_ethtool_stats_get_strings(u8 *data); -u64 *page_pool_ethtool_stats_get(u64 *data, void *stats); - -/* - * Drivers that wish to harvest page pool stats and report them to users - * (perhaps via ethtool, debugfs, or another mechanism) can allocate a - * struct page_pool_stats call page_pool_get_stats to get stats for the specified pool. - */ -bool page_pool_get_stats(struct page_pool *pool, - struct page_pool_stats *stats); -#else +#include +#ifndef CONFIG_PAGE_POOL_STATS static inline int page_pool_ethtool_stats_get_count(void) { return 0; @@ -145,72 +47,7 @@ static inline u64 *page_pool_ethtool_stats_get(u64 *data, void *stats) { return data; } - -#endif - -struct page_pool { - struct page_pool_params p; - - struct delayed_work release_dw; - void (*disconnect)(void *); - unsigned long defer_start; - unsigned long defer_warn; - - u32 pages_state_hold_cnt; - unsigned int frag_offset; - struct page *frag_page; - long frag_users; - -#ifdef CONFIG_PAGE_POOL_STATS - /* these stats are incremented while in softirq context */ - struct page_pool_alloc_stats alloc_stats; -#endif - u32 xdp_mem_id; - - /* - * Data structure for allocation side - * - * Drivers allocation side usually already perform some kind - * of resource protection. Piggyback on this protection, and - * require driver to protect allocation side. - * - * For NIC drivers this means, allocate a page_pool per - * RX-queue. As the RX-queue is already protected by - * Softirq/BH scheduling and napi_schedule. NAPI schedule - * guarantee that a single napi_struct will only be scheduled - * on a single CPU (see napi_schedule). - */ - struct pp_alloc_cache alloc ____cacheline_aligned_in_smp; - - /* Data structure for storing recycled pages. - * - * Returning/freeing pages is more complicated synchronization - * wise, because free's can happen on remote CPUs, with no - * association with allocation resource. - * - * Use ptr_ring, as it separates consumer and producer - * effeciently, it a way that doesn't bounce cache-lines. - * - * TODO: Implement bulk return pages into this structure. - */ - struct ptr_ring ring; - -#ifdef CONFIG_PAGE_POOL_STATS - /* recycle stats are per-cpu to avoid locking */ - struct page_pool_recycle_stats __percpu *recycle_stats; #endif - atomic_t pages_state_release_cnt; - - /* A page_pool is strictly tied to a single RX-queue being - * protected by NAPI, due to above pp_alloc_cache. This - * refcnt serves purpose is to simplify drivers error handling. - */ - refcount_t user_cnt; - - u64 destroy_cnt; -}; - -struct page *page_pool_alloc_pages(struct page_pool *pool, gfp_t gfp); static inline struct page *page_pool_dev_alloc_pages(struct page_pool *pool) { @@ -219,9 +56,6 @@ static inline struct page *page_pool_dev_alloc_pages(struct page_pool *pool) return page_pool_alloc_pages(pool, gfp); } -struct page *page_pool_alloc_frag(struct page_pool *pool, unsigned int *offset, - unsigned int size, gfp_t gfp); - static inline struct page *page_pool_dev_alloc_frag(struct page_pool *pool, unsigned int *offset, unsigned int size) @@ -240,21 +74,7 @@ inline enum dma_data_direction page_pool_get_dma_dir(struct page_pool *pool) return pool->p.dma_dir; } -bool page_pool_return_skb_page(struct page *page, bool napi_safe); - -struct page_pool *page_pool_create(const struct page_pool_params *params); - -struct xdp_mem_info; - -#ifdef CONFIG_PAGE_POOL -void page_pool_unlink_napi(struct page_pool *pool); -void page_pool_destroy(struct page_pool *pool); -void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *), - struct xdp_mem_info *mem); -void page_pool_release_page(struct page_pool *pool, struct page *page); -void page_pool_put_page_bulk(struct page_pool *pool, void **data, - int count); -#else +#ifndef CONFIG_PAGE_POOL static inline void page_pool_unlink_napi(struct page_pool *pool) { } @@ -263,6 +83,7 @@ static inline void page_pool_destroy(struct page_pool *pool) { } +struct xdp_mem_info; static inline void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *), struct xdp_mem_info *mem) @@ -279,10 +100,6 @@ static inline void page_pool_put_page_bulk(struct page_pool *pool, void **data, } #endif -void page_pool_put_defragged_page(struct page_pool *pool, struct page *page, - unsigned int dma_sync_size, - bool allow_direct); - /* pp_frag_count represents the number of writers who can update the page * either by updating skb->data or via DMA mappings for the device. * We can't rely on the page refcnt for that as we don't know who might be @@ -391,8 +208,6 @@ static inline bool page_pool_put(struct page_pool *pool) return refcount_dec_and_test(&pool->user_cnt); } -/* Caller must provide appropriate safe context, e.g. NAPI. */ -void page_pool_update_nid(struct page_pool *pool, int new_nid); static inline void page_pool_nid_changed(struct page_pool *pool, int new_nid) { if (unlikely(pool->p.nid != new_nid)) diff --git a/include/net/page_pool_types.h b/include/net/page_pool_types.h new file mode 100644 index 000000000000..9dc189082e20 --- /dev/null +++ b/include/net/page_pool_types.h @@ -0,0 +1,193 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef _NET_PAGE_POOL_TYPES_H +#define _NET_PAGE_POOL_TYPES_H + +#include +#include + +#define PP_FLAG_DMA_MAP BIT(0) /* Should page_pool do the DMA + * map/unmap + */ +#define PP_FLAG_DMA_SYNC_DEV BIT(1) /* If set all pages that the driver gets + * from page_pool will be + * DMA-synced-for-device according to + * the length provided by the device + * driver. + * Please note DMA-sync-for-CPU is still + * device driver responsibility + */ +#define PP_FLAG_PAGE_FRAG BIT(2) /* for page frag feature */ +#define PP_FLAG_ALL (PP_FLAG_DMA_MAP |\ + PP_FLAG_DMA_SYNC_DEV |\ + PP_FLAG_PAGE_FRAG) + +/* + * Fast allocation side cache array/stack + * + * The cache size and refill watermark is related to the network + * use-case. The NAPI budget is 64 packets. After a NAPI poll the RX + * ring is usually refilled and the max consumed elements will be 64, + * thus a natural max size of objects needed in the cache. + * + * Keeping room for more objects, is due to XDP_DROP use-case. As + * XDP_DROP allows the opportunity to recycle objects directly into + * this array, as it shares the same softirq/NAPI protection. If + * cache is already full (or partly full) then the XDP_DROP recycles + * would have to take a slower code path. + */ +#define PP_ALLOC_CACHE_SIZE 128 +#define PP_ALLOC_CACHE_REFILL 64 +struct pp_alloc_cache { + u32 count; + struct page *cache[PP_ALLOC_CACHE_SIZE]; +}; + +struct page_pool_params { + unsigned int flags; + unsigned int order; + unsigned int pool_size; + int nid; /* Numa node id to allocate from pages from */ + struct device *dev; /* device, for DMA pre-mapping purposes */ + struct napi_struct *napi; /* Sole consumer of pages, otherwise NULL */ + enum dma_data_direction dma_dir; /* DMA mapping direction */ + unsigned int max_len; /* max DMA sync memory size */ + unsigned int offset; /* DMA addr offset */ + void (*init_callback)(struct page *page, void *arg); + void *init_arg; +}; + +#ifdef CONFIG_PAGE_POOL_STATS +struct page_pool_alloc_stats { + u64 fast; /* fast path allocations */ + u64 slow; /* slow-path order 0 allocations */ + u64 slow_high_order; /* slow-path high order allocations */ + u64 empty; /* failed refills due to empty ptr ring, forcing + * slow path allocation + */ + u64 refill; /* allocations via successful refill */ + u64 waive; /* failed refills due to numa zone mismatch */ +}; + +struct page_pool_recycle_stats { + u64 cached; /* recycling placed page in the cache. */ + u64 cache_full; /* cache was full */ + u64 ring; /* recycling placed page back into ptr ring */ + u64 ring_full; /* page was released from page-pool because + * PTR ring was full. + */ + u64 released_refcnt; /* page released because of elevated + * refcnt + */ +}; + +/* This struct wraps the above stats structs so users of the + * page_pool_get_stats API can pass a single argument when requesting the + * stats for the page pool. + */ +struct page_pool_stats { + struct page_pool_alloc_stats alloc_stats; + struct page_pool_recycle_stats recycle_stats; +}; + +int page_pool_ethtool_stats_get_count(void); +u8 *page_pool_ethtool_stats_get_strings(u8 *data); +u64 *page_pool_ethtool_stats_get(u64 *data, void *stats); + +/* + * Drivers that wish to harvest page pool stats and report them to users + * (perhaps via ethtool, debugfs, or another mechanism) can allocate a + * struct page_pool_stats call page_pool_get_stats to get stats for the specified pool. + */ +bool page_pool_get_stats(struct page_pool *pool, + struct page_pool_stats *stats); +#endif + +struct page_pool { + struct page_pool_params p; + + struct delayed_work release_dw; + void (*disconnect)(void *); + unsigned long defer_start; + unsigned long defer_warn; + + u32 pages_state_hold_cnt; + unsigned int frag_offset; + struct page *frag_page; + long frag_users; + +#ifdef CONFIG_PAGE_POOL_STATS + /* these stats are incremented while in softirq context */ + struct page_pool_alloc_stats alloc_stats; +#endif + u32 xdp_mem_id; + + /* + * Data structure for allocation side + * + * Drivers allocation side usually already perform some kind + * of resource protection. Piggyback on this protection, and + * require driver to protect allocation side. + * + * For NIC drivers this means, allocate a page_pool per + * RX-queue. As the RX-queue is already protected by + * Softirq/BH scheduling and napi_schedule. NAPI schedule + * guarantee that a single napi_struct will only be scheduled + * on a single CPU (see napi_schedule). + */ + struct pp_alloc_cache alloc ____cacheline_aligned_in_smp; + + /* Data structure for storing recycled pages. + * + * Returning/freeing pages is more complicated synchronization + * wise, because free's can happen on remote CPUs, with no + * association with allocation resource. + * + * Use ptr_ring, as it separates consumer and producer + * effeciently, it a way that doesn't bounce cache-lines. + * + * TODO: Implement bulk return pages into this structure. + */ + struct ptr_ring ring; + +#ifdef CONFIG_PAGE_POOL_STATS + /* recycle stats are per-cpu to avoid locking */ + struct page_pool_recycle_stats __percpu *recycle_stats; +#endif + atomic_t pages_state_release_cnt; + + /* A page_pool is strictly tied to a single RX-queue being + * protected by NAPI, due to above pp_alloc_cache. This + * refcnt serves purpose is to simplify drivers error handling. + */ + refcount_t user_cnt; + + u64 destroy_cnt; +}; + +struct page *page_pool_alloc_pages(struct page_pool *pool, gfp_t gfp); +struct page *page_pool_alloc_frag(struct page_pool *pool, unsigned int *offset, + unsigned int size, gfp_t gfp); +bool page_pool_return_skb_page(struct page *page, bool napi_safe); +struct page_pool *page_pool_create(const struct page_pool_params *params); + +#ifdef CONFIG_PAGE_POOL +void page_pool_unlink_napi(struct page_pool *pool); +void page_pool_destroy(struct page_pool *pool); + +struct xdp_mem_info; +void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *), + struct xdp_mem_info *mem); +void page_pool_release_page(struct page_pool *pool, struct page *page); +void page_pool_put_page_bulk(struct page_pool *pool, void **data, + int count); +#endif + +void page_pool_put_defragged_page(struct page_pool *pool, struct page *page, + unsigned int dma_sync_size, + bool allow_direct); + +/* Caller must provide appropriate safe context, e.g. NAPI. */ +void page_pool_update_nid(struct page_pool *pool, int new_nid); + +#endif /* _NET_PAGE_POOL_H */