1 /* SPDX-License-Identifier: GPL-2.0 */
9 #include <linux/dma-mapping.h>
27 	dma_addr_t dma;  member
29 	struct xsk_buff_pool *pool;  member
65 	/* For performance reasons, each buff pool has its own array of dma_pages
94  * The low 12-bits of the addr will be 0 since this is the page address, so we
103 int xp_assign_dev(struct xsk_buff_pool *pool, struct net_device *dev,
105 int xp_assign_dev_shared(struct xsk_buff_pool *pool, struct xdp_sock *umem_xs,
107 int xp_alloc_tx_descs(struct xsk_buff_pool *pool, struct xdp_sock *xs);
108 void xp_destroy(struct xsk_buff_pool *pool);
109 void xp_get_pool(struct xsk_buff_pool *pool);
110 bool xp_put_pool(struct xsk_buff_pool *pool);
111 void xp_clear_dev(struct xsk_buff_pool *pool);
112 void xp_add_xsk(struct xsk_buff_pool *pool, struct xdp_sock *xs);
113 void xp_del_xsk(struct xsk_buff_pool *pool, struct xdp_sock *xs);
118 static inline void xp_init_xskb_addr(struct xdp_buff_xsk *xskb, struct xsk_buff_pool *pool,  in xp_init_xskb_addr()  argument
121 	xskb->orig_addr = addr;  in xp_init_xskb_addr()
122 	xskb->xdp.data_hard_start = pool->addrs + addr + pool->headroom;  in xp_init_xskb_addr()
125 static inline void xp_init_xskb_dma(struct xdp_buff_xsk *xskb, struct xsk_buff_pool *pool,  in xp_init_xskb_dma()  argument
128 	xskb->frame_dma = (dma_pages[addr >> PAGE_SHIFT] & ~XSK_NEXT_PG_CONTIG_MASK) +  in xp_init_xskb_dma()
130 	xskb->dma = xskb->frame_dma + pool->headroom + XDP_PACKET_HEADROOM;  in xp_init_xskb_dma()
134 void xp_set_rxq_info(struct xsk_buff_pool *pool, struct xdp_rxq_info *rxq);
135 int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev,
137 void xp_dma_unmap(struct xsk_buff_pool *pool, unsigned long attrs);
138 struct xdp_buff *xp_alloc(struct xsk_buff_pool *pool);
139 u32 xp_alloc_batch(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max);
140 bool xp_can_alloc(struct xsk_buff_pool *pool, u32 count);
141 void *xp_raw_get_data(struct xsk_buff_pool *pool, u64 addr);
142 dma_addr_t xp_raw_get_dma(struct xsk_buff_pool *pool, u64 addr);
145 	return xskb->dma;  in xp_get_dma()
150 	return xskb->frame_dma;  in xp_get_frame_dma()
159 void xp_dma_sync_for_device_slow(struct xsk_buff_pool *pool, dma_addr_t dma,
161 static inline void xp_dma_sync_for_device(struct xsk_buff_pool *pool,  in xp_dma_sync_for_device()  argument
162 					  dma_addr_t dma, size_t size)  in xp_dma_sync_for_device()  argument
164 	if (!pool->dma_need_sync)  in xp_dma_sync_for_device()
167 	xp_dma_sync_for_device_slow(pool, dma, size);  in xp_dma_sync_for_device()
171  * The low 12-bits of the addr will be 0 since this is the page address, so we
177 static inline bool xp_desc_crosses_non_contig_pg(struct xsk_buff_pool *pool,  in xp_desc_crosses_non_contig_pg()  argument
180 	bool cross_pg = (addr & (PAGE_SIZE - 1)) + len > PAGE_SIZE;  in xp_desc_crosses_non_contig_pg()
185 	return pool->dma_pages &&  in xp_desc_crosses_non_contig_pg()
186 	       !(pool->dma_pages[addr >> PAGE_SHIFT] & XSK_NEXT_PG_CONTIG_MASK);  in xp_desc_crosses_non_contig_pg()
191 	return desc->options & XDP_PKT_CONTD;  in xp_mb_desc()
194 static inline u64 xp_aligned_extract_addr(struct xsk_buff_pool *pool, u64 addr)  in xp_aligned_extract_addr()  argument
196 	return addr & pool->chunk_mask;  in xp_aligned_extract_addr()
215 static inline u32 xp_aligned_extract_idx(struct xsk_buff_pool *pool, u64 addr)  in xp_aligned_extract_idx()  argument
217 	return xp_aligned_extract_addr(pool, addr) >> pool->chunk_shift;  in xp_aligned_extract_idx()
222 	if (xskb->pool->unaligned)  in xp_release()
223 		xskb->pool->free_heads[xskb->pool->free_heads_cnt++] = xskb;  in xp_release()
228 	u64 offset = xskb->xdp.data - xskb->xdp.data_hard_start;  in xp_get_handle()
230 	offset += xskb->pool->headroom;  in xp_get_handle()
231 	if (!xskb->pool->unaligned)  in xp_get_handle()
232 		return xskb->orig_addr + offset;  in xp_get_handle()
233 	return xskb->orig_addr + (offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT);  in xp_get_handle()