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Drivers should likely use * page_pool_dev_alloc_pages() replacing dev_alloc_pages(). * * API keeps track of in-flight pages, in-order to let API user know * when it is safe to dealloactor page_pool object. Thus, API users * must make sure to call page_pool_release_page() when a page is * "leaving" the page_pool. Or call page_pool_put_page() where * appropiate. For maintaining correct accounting. * * API user must only call page_pool_put_page() once on a page, as it * will either recycle the page, or in case of elevated refcnt, it * will release the DMA mapping and in-flight state accounting. We * hope to lift this requirement in the future. */ #ifndef _NET_PAGE_POOL_H #define _NET_PAGE_POOL_H #include /* Needed by ptr_ring */ #include #include #define PP_FLAG_DMA_MAP 1 /* Should page_pool do the DMA map/unmap */ #define PP_FLAG_ALL PP_FLAG_DMA_MAP /* * 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; void *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 */ enum dma_data_direction dma_dir; /* DMA mapping direction */ }; 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; /* * 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; 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; }; 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) { gfp_t gfp = (GFP_ATOMIC | __GFP_NOWARN); return page_pool_alloc_pages(pool, gfp); } /* get the stored dma direction. A driver might decide to treat this locally and * avoid the extra cache line from page_pool to determine the direction */ static inline enum dma_data_direction page_pool_get_dma_dir(struct page_pool *pool) { return pool->p.dma_dir; } struct page_pool *page_pool_create(const struct page_pool_params *params); #ifdef CONFIG_PAGE_POOL void page_pool_destroy(struct page_pool *pool); void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *)); #else static inline void page_pool_destroy(struct page_pool *pool) { } static inline void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *)) { } #endif /* Never call this directly, use helpers below */ void __page_pool_put_page(struct page_pool *pool, struct page *page, bool allow_direct); static inline void page_pool_put_page(struct page_pool *pool, struct page *page, bool allow_direct) { /* When page_pool isn't compiled-in, net/core/xdp.c doesn't * allow registering MEM_TYPE_PAGE_POOL, but shield linker. */ #ifdef CONFIG_PAGE_POOL __page_pool_put_page(pool, page, allow_direct); #endif } /* Very limited use-cases allow recycle direct */ static inline void page_pool_recycle_direct(struct page_pool *pool, struct page *page) { __page_pool_put_page(pool, page, true); } /* Disconnects a page (from a page_pool). API users can have a need * to disconnect a page (from a page_pool), to allow it to be used as * a regular page (that will eventually be returned to the normal * page-allocator via put_page). */ void page_pool_unmap_page(struct page_pool *pool, struct page *page); static inline void page_pool_release_page(struct page_pool *pool, struct page *page) { #ifdef CONFIG_PAGE_POOL page_pool_unmap_page(pool, page); #endif } static inline dma_addr_t page_pool_get_dma_addr(struct page *page) { dma_addr_t ret = page->dma_addr[0]; if (sizeof(dma_addr_t) > sizeof(unsigned long)) ret |= (dma_addr_t)page->dma_addr[1] << 16 << 16; return ret; } static inline void page_pool_set_dma_addr(struct page *page, dma_addr_t addr) { page->dma_addr[0] = addr; if (sizeof(dma_addr_t) > sizeof(unsigned long)) page->dma_addr[1] = upper_32_bits(addr); } static inline bool is_page_pool_compiled_in(void) { #ifdef CONFIG_PAGE_POOL return true; #else return false; #endif } static inline bool page_pool_put(struct page_pool *pool) { return refcount_dec_and_test(&pool->user_cnt); } #endif /* _NET_PAGE_POOL_H */