1 files changed, 140 insertions, 0 deletions
diff --git a/include/net/xsk_buff_pool.h b/include/net/xsk_buff_pool.h
new file mode 100644
index 000000000000..a4ff226505c9
--- /dev/null
+++ b/include/net/xsk_buff_pool.h
@@ -0,0 +1,140 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright(c) 2020 Intel Corporation. */
+
+#ifndef XSK_BUFF_POOL_H_
+#define XSK_BUFF_POOL_H_
+
+#include <linux/if_xdp.h>
+#include <linux/types.h>
+#include <linux/dma-mapping.h>
+#include <net/xdp.h>
+
+struct xsk_buff_pool;
+struct xdp_rxq_info;
+struct xsk_queue;
+struct xdp_desc;
+struct device;
+struct page;
+
+struct xdp_buff_xsk {
+	struct xdp_buff xdp;
+	dma_addr_t dma;
+	dma_addr_t frame_dma;
+	struct xsk_buff_pool *pool;
+	bool unaligned;
+	u64 orig_addr;
+	struct list_head free_list_node;
+};
+
+struct xsk_buff_pool {
+	struct xsk_queue *fq;
+	struct list_head free_list;
+	dma_addr_t *dma_pages;
+	struct xdp_buff_xsk *heads;
+	u64 chunk_mask;
+	u64 addrs_cnt;
+	u32 free_list_cnt;
+	u32 dma_pages_cnt;
+	u32 heads_cnt;
+	u32 free_heads_cnt;
+	u32 headroom;
+	u32 chunk_size;
+	u32 frame_len;
+	bool cheap_dma;
+	bool unaligned;
+	void *addrs;
+	struct device *dev;
+	struct xdp_buff_xsk *free_heads[];
+};
+
+/* AF_XDP core. */
+struct xsk_buff_pool *xp_create(struct page **pages, u32 nr_pages, u32 chunks,
+				u32 chunk_size, u32 headroom, u64 size,
+				bool unaligned);
+void xp_set_fq(struct xsk_buff_pool *pool, struct xsk_queue *fq);
+void xp_destroy(struct xsk_buff_pool *pool);
+void xp_release(struct xdp_buff_xsk *xskb);
+
+/* AF_XDP, and XDP core. */
+void xp_free(struct xdp_buff_xsk *xskb);
+
+/* AF_XDP ZC drivers, via xdp_sock_buff.h */
+void xp_set_rxq_info(struct xsk_buff_pool *pool, struct xdp_rxq_info *rxq);
+int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev,
+	       unsigned long attrs, struct page **pages, u32 nr_pages);
+void xp_dma_unmap(struct xsk_buff_pool *pool, unsigned long attrs);
+struct xdp_buff *xp_alloc(struct xsk_buff_pool *pool);
+bool xp_can_alloc(struct xsk_buff_pool *pool, u32 count);
+void *xp_raw_get_data(struct xsk_buff_pool *pool, u64 addr);
+dma_addr_t xp_raw_get_dma(struct xsk_buff_pool *pool, u64 addr);
+static inline dma_addr_t xp_get_dma(struct xdp_buff_xsk *xskb)
+{
+	return xskb->dma;
+}
+
+static inline dma_addr_t xp_get_frame_dma(struct xdp_buff_xsk *xskb)
+{
+	return xskb->frame_dma;
+}
+
+void xp_dma_sync_for_cpu_slow(struct xdp_buff_xsk *xskb);
+static inline void xp_dma_sync_for_cpu(struct xdp_buff_xsk *xskb)
+{
+	if (xskb->pool->cheap_dma)
+		return;
+
+	xp_dma_sync_for_cpu_slow(xskb);
+}
+
+void xp_dma_sync_for_device_slow(struct xsk_buff_pool *pool, dma_addr_t dma,
+				 size_t size);
+static inline void xp_dma_sync_for_device(struct xsk_buff_pool *pool,
+					  dma_addr_t dma, size_t size)
+{
+	if (pool->cheap_dma)
+		return;
+
+	xp_dma_sync_for_device_slow(pool, dma, size);
+}
+
+/* Masks for xdp_umem_page flags.
+ * The low 12-bits of the addr will be 0 since this is the page address, so we
+ * can use them for flags.
+ */
+#define XSK_NEXT_PG_CONTIG_SHIFT 0
+#define XSK_NEXT_PG_CONTIG_MASK BIT_ULL(XSK_NEXT_PG_CONTIG_SHIFT)
+
+static inline bool xp_desc_crosses_non_contig_pg(struct xsk_buff_pool *pool,
+						 u64 addr, u32 len)
+{
+	bool cross_pg = (addr & (PAGE_SIZE - 1)) + len > PAGE_SIZE;
+
+	if (pool->dma_pages_cnt && cross_pg) {
+		return !(pool->dma_pages[addr >> PAGE_SHIFT] &
+			 XSK_NEXT_PG_CONTIG_MASK);
+	}
+	return false;
+}
+
+static inline u64 xp_aligned_extract_addr(struct xsk_buff_pool *pool, u64 addr)
+{
+	return addr & pool->chunk_mask;
+}
+
+static inline u64 xp_unaligned_extract_addr(u64 addr)
+{
+	return addr & XSK_UNALIGNED_BUF_ADDR_MASK;
+}
+
+static inline u64 xp_unaligned_extract_offset(u64 addr)
+{
+	return addr >> XSK_UNALIGNED_BUF_OFFSET_SHIFT;
+}
+
+static inline u64 xp_unaligned_add_offset_to_addr(u64 addr)
+{
+	return xp_unaligned_extract_addr(addr) +
+		xp_unaligned_extract_offset(addr);
+}
+
+#endif /* XSK_BUFF_POOL_H_ */