1 files changed, 289 insertions, 0 deletions
diff --git a/include/net/xdp_sock_drv.h b/include/net/xdp_sock_drv.h
new file mode 100644
index 000000000..9c0d86060
--- /dev/null
+++ b/include/net/xdp_sock_drv.h
@@ -0,0 +1,289 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Interface for implementing AF_XDP zero-copy support in drivers.
+ * Copyright(c) 2020 Intel Corporation.
+ */
+
+#ifndef _LINUX_XDP_SOCK_DRV_H
+#define _LINUX_XDP_SOCK_DRV_H
+
+#include <net/xdp_sock.h>
+#include <net/xsk_buff_pool.h>
+
+#define XDP_UMEM_MIN_CHUNK_SHIFT 11
+#define XDP_UMEM_MIN_CHUNK_SIZE (1 << XDP_UMEM_MIN_CHUNK_SHIFT)
+
+#ifdef CONFIG_XDP_SOCKETS
+
+void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries);
+bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc);
+u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 max);
+void xsk_tx_release(struct xsk_buff_pool *pool);
+struct xsk_buff_pool *xsk_get_pool_from_qid(struct net_device *dev,
+					    u16 queue_id);
+void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool);
+void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool);
+void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool);
+void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool);
+bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool);
+
+static inline u32 xsk_pool_get_headroom(struct xsk_buff_pool *pool)
+{
+	return XDP_PACKET_HEADROOM + pool->headroom;
+}
+
+static inline u32 xsk_pool_get_chunk_size(struct xsk_buff_pool *pool)
+{
+	return pool->chunk_size;
+}
+
+static inline u32 xsk_pool_get_rx_frame_size(struct xsk_buff_pool *pool)
+{
+	return xsk_pool_get_chunk_size(pool) - xsk_pool_get_headroom(pool);
+}
+
+static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
+					 struct xdp_rxq_info *rxq)
+{
+	xp_set_rxq_info(pool, rxq);
+}
+
+static inline unsigned int xsk_pool_get_napi_id(struct xsk_buff_pool *pool)
+{
+#ifdef CONFIG_NET_RX_BUSY_POLL
+	return pool->heads[0].xdp.rxq->napi_id;
+#else
+	return 0;
+#endif
+}
+
+static inline void xsk_pool_dma_unmap(struct xsk_buff_pool *pool,
+				      unsigned long attrs)
+{
+	xp_dma_unmap(pool, attrs);
+}
+
+static inline int xsk_pool_dma_map(struct xsk_buff_pool *pool,
+				   struct device *dev, unsigned long attrs)
+{
+	struct xdp_umem *umem = pool->umem;
+
+	return xp_dma_map(pool, dev, attrs, umem->pgs, umem->npgs);
+}
+
+static inline dma_addr_t xsk_buff_xdp_get_dma(struct xdp_buff *xdp)
+{
+	struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
+
+	return xp_get_dma(xskb);
+}
+
+static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
+{
+	struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
+
+	return xp_get_frame_dma(xskb);
+}
+
+static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
+{
+	return xp_alloc(pool);
+}
+
+/* Returns as many entries as possible up to max. 0 <= N <= max. */
+static inline u32 xsk_buff_alloc_batch(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max)
+{
+	return xp_alloc_batch(pool, xdp, max);
+}
+
+static inline bool xsk_buff_can_alloc(struct xsk_buff_pool *pool, u32 count)
+{
+	return xp_can_alloc(pool, count);
+}
+
+static inline void xsk_buff_free(struct xdp_buff *xdp)
+{
+	struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
+
+	xp_free(xskb);
+}
+
+static inline void xsk_buff_set_size(struct xdp_buff *xdp, u32 size)
+{
+	xdp->data = xdp->data_hard_start + XDP_PACKET_HEADROOM;
+	xdp->data_meta = xdp->data;
+	xdp->data_end = xdp->data + size;
+}
+
+static inline dma_addr_t xsk_buff_raw_get_dma(struct xsk_buff_pool *pool,
+					      u64 addr)
+{
+	return xp_raw_get_dma(pool, addr);
+}
+
+static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
+{
+	return xp_raw_get_data(pool, addr);
+}
+
+static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp, struct xsk_buff_pool *pool)
+{
+	struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
+
+	if (!pool->dma_need_sync)
+		return;
+
+	xp_dma_sync_for_cpu(xskb);
+}
+
+static inline void xsk_buff_raw_dma_sync_for_device(struct xsk_buff_pool *pool,
+						    dma_addr_t dma,
+						    size_t size)
+{
+	xp_dma_sync_for_device(pool, dma, size);
+}
+
+#else
+
+static inline void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries)
+{
+}
+
+static inline bool xsk_tx_peek_desc(struct xsk_buff_pool *pool,
+				    struct xdp_desc *desc)
+{
+	return false;
+}
+
+static inline u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 max)
+{
+	return 0;
+}
+
+static inline void xsk_tx_release(struct xsk_buff_pool *pool)
+{
+}
+
+static inline struct xsk_buff_pool *
+xsk_get_pool_from_qid(struct net_device *dev, u16 queue_id)
+{
+	return NULL;
+}
+
+static inline void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool)
+{
+}
+
+static inline void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool)
+{
+}
+
+static inline void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool)
+{
+}
+
+static inline void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool)
+{
+}
+
+static inline bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool)
+{
+	return false;
+}
+
+static inline u32 xsk_pool_get_headroom(struct xsk_buff_pool *pool)
+{
+	return 0;
+}
+
+static inline u32 xsk_pool_get_chunk_size(struct xsk_buff_pool *pool)
+{
+	return 0;
+}
+
+static inline u32 xsk_pool_get_rx_frame_size(struct xsk_buff_pool *pool)
+{
+	return 0;
+}
+
+static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
+					 struct xdp_rxq_info *rxq)
+{
+}
+
+static inline unsigned int xsk_pool_get_napi_id(struct xsk_buff_pool *pool)
+{
+	return 0;
+}
+
+static inline void xsk_pool_dma_unmap(struct xsk_buff_pool *pool,
+				      unsigned long attrs)
+{
+}
+
+static inline int xsk_pool_dma_map(struct xsk_buff_pool *pool,
+				   struct device *dev, unsigned long attrs)
+{
+	return 0;
+}
+
+static inline dma_addr_t xsk_buff_xdp_get_dma(struct xdp_buff *xdp)
+{
+	return 0;
+}
+
+static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
+{
+	return 0;
+}
+
+static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
+{
+	return NULL;
+}
+
+static inline u32 xsk_buff_alloc_batch(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max)
+{
+	return 0;
+}
+
+static inline bool xsk_buff_can_alloc(struct xsk_buff_pool *pool, u32 count)
+{
+	return false;
+}
+
+static inline void xsk_buff_free(struct xdp_buff *xdp)
+{
+}
+
+static inline void xsk_buff_discard(struct xdp_buff *xdp)
+{
+}
+
+static inline void xsk_buff_set_size(struct xdp_buff *xdp, u32 size)
+{
+}
+
+static inline dma_addr_t xsk_buff_raw_get_dma(struct xsk_buff_pool *pool,
+					      u64 addr)
+{
+	return 0;
+}
+
+static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
+{
+	return NULL;
+}
+
+static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp, struct xsk_buff_pool *pool)
+{
+}
+
+static inline void xsk_buff_raw_dma_sync_for_device(struct xsk_buff_pool *pool,
+						    dma_addr_t dma,
+						    size_t size)
+{
+}
+
+#endif /* CONFIG_XDP_SOCKETS */
+
+#endif /* _LINUX_XDP_SOCK_DRV_H */