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1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.4 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.5 */6 7#ifndef _VNIC_WQ_H_8#define _VNIC_WQ_H_9 10#include <linux/pci.h>11 12#include "vnic_dev.h"13#include "vnic_cq.h"14 15/* Work queue control */16struct vnic_wq_ctrl {17	u64 ring_base;			/* 0x00 */18	u32 ring_size;			/* 0x08 */19	u32 pad0;20	u32 posted_index;		/* 0x10 */21	u32 pad1;22	u32 cq_index;			/* 0x18 */23	u32 pad2;24	u32 enable;			/* 0x20 */25	u32 pad3;26	u32 running;			/* 0x28 */27	u32 pad4;28	u32 fetch_index;		/* 0x30 */29	u32 pad5;30	u32 dca_value;			/* 0x38 */31	u32 pad6;32	u32 error_interrupt_enable;	/* 0x40 */33	u32 pad7;34	u32 error_interrupt_offset;	/* 0x48 */35	u32 pad8;36	u32 error_status;		/* 0x50 */37	u32 pad9;38};39 40struct vnic_wq_buf {41	struct vnic_wq_buf *next;42	dma_addr_t dma_addr;43	void *os_buf;44	unsigned int len;45	unsigned int index;46	int sop;47	void *desc;48	uint64_t wr_id; /* Cookie */49	uint8_t cq_entry; /* Gets completion event from hw */50	uint8_t desc_skip_cnt; /* Num descs to occupy */51	uint8_t compressed_send; /* Both hdr and payload in one desc */52	struct vnic_wq_buf *prev;53};54 55/* Break the vnic_wq_buf allocations into blocks of 32/64 entries */56#define VNIC_WQ_BUF_MIN_BLK_ENTRIES 3257#define VNIC_WQ_BUF_DFLT_BLK_ENTRIES 6458#define VNIC_WQ_BUF_BLK_ENTRIES(entries) \59	((unsigned int)((entries < VNIC_WQ_BUF_DFLT_BLK_ENTRIES) ? \60	VNIC_WQ_BUF_MIN_BLK_ENTRIES : VNIC_WQ_BUF_DFLT_BLK_ENTRIES))61#define VNIC_WQ_BUF_BLK_SZ(entries) \62	(VNIC_WQ_BUF_BLK_ENTRIES(entries) * sizeof(struct vnic_wq_buf))63#define VNIC_WQ_BUF_BLKS_NEEDED(entries) \64	DIV_ROUND_UP(entries, VNIC_WQ_BUF_BLK_ENTRIES(entries))65#define VNIC_WQ_BUF_BLKS_MAX VNIC_WQ_BUF_BLKS_NEEDED(4096)66 67struct vnic_wq {68	unsigned int index;69	struct vnic_dev *vdev;70	struct vnic_wq_ctrl __iomem *ctrl;              /* memory-mapped */71	struct vnic_dev_ring ring;72	struct vnic_wq_buf *bufs[VNIC_WQ_BUF_BLKS_MAX];73	struct vnic_wq_buf *to_use;74	struct vnic_wq_buf *to_clean;75	unsigned int pkts_outstanding;76};77 78struct devcmd2_controller {79	struct vnic_wq_ctrl __iomem *wq_ctrl;80	struct vnic_devcmd2 *cmd_ring;81	struct devcmd2_result *result;82	u16 next_result;83	u16 result_size;84	int color;85	struct vnic_dev_ring results_ring;86	struct vnic_wq wq;87	u32 posted;88};89 90static inline unsigned int vnic_wq_desc_avail(struct vnic_wq *wq)91{92	/* how many does SW own? */93	return wq->ring.desc_avail;94}95 96static inline unsigned int vnic_wq_desc_used(struct vnic_wq *wq)97{98	/* how many does HW own? */99	return wq->ring.desc_count - wq->ring.desc_avail - 1;100}101 102static inline void *vnic_wq_next_desc(struct vnic_wq *wq)103{104	return wq->to_use->desc;105}106 107static inline void vnic_wq_doorbell(struct vnic_wq *wq)108{109	/* Adding write memory barrier prevents compiler and/or CPU110	 * reordering, thus avoiding descriptor posting before111	 * descriptor is initialized. Otherwise, hardware can read112	 * stale descriptor fields.113	 */114	wmb();115	iowrite32(wq->to_use->index, &wq->ctrl->posted_index);116}117 118static inline void vnic_wq_post(struct vnic_wq *wq,119	void *os_buf, dma_addr_t dma_addr,120	unsigned int len, int sop, int eop,121	uint8_t desc_skip_cnt, uint8_t cq_entry,122	uint8_t compressed_send, uint64_t wrid)123{124	struct vnic_wq_buf *buf = wq->to_use;125 126	buf->sop = sop;127	buf->cq_entry = cq_entry;128	buf->compressed_send = compressed_send;129	buf->desc_skip_cnt = desc_skip_cnt;130	buf->os_buf = eop ? os_buf : NULL;131	buf->dma_addr = dma_addr;132	buf->len = len;133	buf->wr_id = wrid;134 135	buf = buf->next;136	wq->to_use = buf;137 138	wq->ring.desc_avail -= desc_skip_cnt;139}140 141static inline void vnic_wq_service(struct vnic_wq *wq,142	struct cq_desc *cq_desc, u16 completed_index,143	void (*buf_service)(struct vnic_wq *wq,144	struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque),145	void *opaque)146{147	struct vnic_wq_buf *buf;148 149	buf = wq->to_clean;150	while (1) {151 152		(*buf_service)(wq, cq_desc, buf, opaque);153 154		wq->ring.desc_avail++;155 156		wq->to_clean = buf->next;157 158		if (buf->index == completed_index)159			break;160 161		buf = wq->to_clean;162	}163}164 165void vnic_wq_free(struct vnic_wq *wq);166int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,167	unsigned int desc_count, unsigned int desc_size);168void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,169	unsigned int error_interrupt_enable,170	unsigned int error_interrupt_offset);171unsigned int vnic_wq_error_status(struct vnic_wq *wq);172void vnic_wq_enable(struct vnic_wq *wq);173int vnic_wq_disable(struct vnic_wq *wq);174void vnic_wq_clean(struct vnic_wq *wq,175	void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf));176int enic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,177			  unsigned int desc_count, unsigned int desc_size);178void enic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,179			unsigned int fetch_index, unsigned int posted_index,180			unsigned int error_interrupt_enable,181			unsigned int error_interrupt_offset);182 183#endif /* _VNIC_WQ_H_ */184