1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.h b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.h
new file mode 100644
index 000000000000..4a206c0e7192
--- /dev/null
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.h
@@ -0,0 +1,127 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) Meta Platforms, Inc. and affiliates. */
+
+#ifndef _FBNIC_TXRX_H_
+#define _FBNIC_TXRX_H_
+
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+#include <net/xdp.h>
+
+struct fbnic_net;
+
+/* Guarantee we have space needed for storing the buffer
+ * To store the buffer we need:
+ *	1 descriptor per page
+ *	+ 1 descriptor for skb head
+ *	+ 2 descriptors for metadata and optional metadata
+ *	+ 7 descriptors to keep tail out of the same cacheline as head
+ * If we cannot guarantee that then we should return TX_BUSY
+ */
+#define FBNIC_MAX_SKB_DESC	(MAX_SKB_FRAGS + 10)
+#define FBNIC_TX_DESC_WAKEUP	(FBNIC_MAX_SKB_DESC * 2)
+#define FBNIC_TX_DESC_MIN	roundup_pow_of_two(FBNIC_TX_DESC_WAKEUP)
+
+#define FBNIC_MAX_TXQS			128u
+#define FBNIC_MAX_RXQS			128u
+
+#define FBNIC_TXQ_SIZE_DEFAULT		1024
+#define FBNIC_HPQ_SIZE_DEFAULT		256
+#define FBNIC_PPQ_SIZE_DEFAULT		256
+#define FBNIC_RCQ_SIZE_DEFAULT		1024
+
+#define FBNIC_RX_TROOM \
+	SKB_DATA_ALIGN(sizeof(struct skb_shared_info))
+#define FBNIC_RX_HROOM \
+	(ALIGN(FBNIC_RX_TROOM + NET_SKB_PAD, 128) - FBNIC_RX_TROOM)
+#define FBNIC_RX_PAD			0
+#define FBNIC_RX_MAX_HDR		(1536 - FBNIC_RX_PAD)
+#define FBNIC_RX_PAYLD_OFFSET		0
+#define FBNIC_RX_PAYLD_PG_CL		0
+
+#define FBNIC_RING_F_DISABLED		BIT(0)
+#define FBNIC_RING_F_CTX		BIT(1)
+#define FBNIC_RING_F_STATS		BIT(2)	/* Ring's stats may be used */
+
+struct fbnic_pkt_buff {
+	struct xdp_buff buff;
+	u32 data_truesize;
+	u16 data_len;
+	u16 nr_frags;
+};
+
+/* Pagecnt bias is long max to reserve the last bit to catch overflow
+ * cases where if we overcharge the bias it will flip over to be negative.
+ */
+#define PAGECNT_BIAS_MAX	LONG_MAX
+struct fbnic_rx_buf {
+	struct page *page;
+	long pagecnt_bias;
+};
+
+struct fbnic_ring {
+	/* Pointer to buffer specific info */
+	union {
+		struct fbnic_pkt_buff *pkt;	/* RCQ */
+		struct fbnic_rx_buf *rx_buf;	/* BDQ */
+		void **tx_buf;			/* TWQ */
+		void *buffer;			/* Generic pointer */
+	};
+
+	u32 __iomem *doorbell;		/* Pointer to CSR space for ring */
+	__le64 *desc;			/* Descriptor ring memory */
+	u16 size_mask;			/* Size of ring in descriptors - 1 */
+	u8 q_idx;			/* Logical netdev ring index */
+	u8 flags;			/* Ring flags (FBNIC_RING_F_*) */
+
+	u32 head, tail;			/* Head/Tail of ring */
+
+	/* Slow path fields follow */
+	dma_addr_t dma;			/* Phys addr of descriptor memory */
+	size_t size;			/* Size of descriptor ring in memory */
+};
+
+struct fbnic_q_triad {
+	struct fbnic_ring sub0, sub1, cmpl;
+};
+
+struct fbnic_napi_vector {
+	struct napi_struct napi;
+	struct device *dev;		/* Device for DMA unmapping */
+	struct page_pool *page_pool;
+	struct fbnic_dev *fbd;
+	char name[IFNAMSIZ + 9];
+
+	u16 v_idx;
+	u8 txt_count;
+	u8 rxt_count;
+
+	struct list_head napis;
+
+	struct fbnic_q_triad qt[];
+};
+
+#define FBNIC_MAX_TXQS			128u
+#define FBNIC_MAX_RXQS			128u
+
+netdev_tx_t fbnic_xmit_frame(struct sk_buff *skb, struct net_device *dev);
+netdev_features_t
+fbnic_features_check(struct sk_buff *skb, struct net_device *dev,
+		     netdev_features_t features);
+
+int fbnic_alloc_napi_vectors(struct fbnic_net *fbn);
+void fbnic_free_napi_vectors(struct fbnic_net *fbn);
+int fbnic_alloc_resources(struct fbnic_net *fbn);
+void fbnic_free_resources(struct fbnic_net *fbn);
+void fbnic_napi_enable(struct fbnic_net *fbn);
+void fbnic_napi_disable(struct fbnic_net *fbn);
+void fbnic_enable(struct fbnic_net *fbn);
+void fbnic_disable(struct fbnic_net *fbn);
+void fbnic_flush(struct fbnic_net *fbn);
+void fbnic_fill(struct fbnic_net *fbn);
+
+void fbnic_napi_depletion_check(struct net_device *netdev);
+int fbnic_wait_all_queues_idle(struct fbnic_dev *fbd, bool may_fail);
+
+#endif /* _FBNIC_TXRX_H_ */