1/* SPDX-License-Identifier: GPL-2.0-only */
2/* Copyright 2014 Cisco Systems, Inc. All rights reserved. */
3
4#ifndef _VNIC_WQ_H_
5#define _VNIC_WQ_H_
6
7#include <linux/pci.h>
8#include "vnic_dev.h"
9#include "vnic_cq.h"
10
11/* Work queue control */
12struct vnic_wq_ctrl {
13 u64 ring_base; /* 0x00 */
14 u32 ring_size; /* 0x08 */
15 u32 pad0;
16 u32 posted_index; /* 0x10 */
17 u32 pad1;
18 u32 cq_index; /* 0x18 */
19 u32 pad2;
20 u32 enable; /* 0x20 */
21 u32 pad3;
22 u32 running; /* 0x28 */
23 u32 pad4;
24 u32 fetch_index; /* 0x30 */
25 u32 pad5;
26 u32 dca_value; /* 0x38 */
27 u32 pad6;
28 u32 error_interrupt_enable; /* 0x40 */
29 u32 pad7;
30 u32 error_interrupt_offset; /* 0x48 */
31 u32 pad8;
32 u32 error_status; /* 0x50 */
33 u32 pad9;
34};
35
36struct vnic_wq_buf {
37 struct vnic_wq_buf *next;
38 dma_addr_t dma_addr;
39 void *os_buf;
40 unsigned int len;
41 unsigned int index;
42 int sop;
43 void *desc;
44};
45
46/* Break the vnic_wq_buf allocations into blocks of 64 entries */
47#define VNIC_WQ_BUF_MIN_BLK_ENTRIES 32
48#define VNIC_WQ_BUF_DFLT_BLK_ENTRIES 64
49#define VNIC_WQ_BUF_BLK_ENTRIES(entries) \
50 ((unsigned int)(entries < VNIC_WQ_BUF_DFLT_BLK_ENTRIES) ? \
51 VNIC_WQ_BUF_MIN_BLK_ENTRIES : VNIC_WQ_BUF_DFLT_BLK_ENTRIES)
52#define VNIC_WQ_BUF_BLK_SZ \
53 (VNIC_WQ_BUF_DFLT_BLK_ENTRIES * sizeof(struct vnic_wq_buf))
54#define VNIC_WQ_BUF_BLKS_NEEDED(entries) \
55 DIV_ROUND_UP(entries, VNIC_WQ_BUF_DFLT_BLK_ENTRIES)
56#define VNIC_WQ_BUF_BLKS_NEEDED(entries) \
57 DIV_ROUND_UP(entries, VNIC_WQ_BUF_DFLT_BLK_ENTRIES)
58#define VNIC_WQ_BUF_BLKS_MAX VNIC_WQ_BUF_BLKS_NEEDED(4096)
59
60struct vnic_wq {
61 unsigned int index;
62 struct vnic_dev *vdev;
63 struct vnic_wq_ctrl __iomem *ctrl; /* memory-mapped */
64 struct vnic_dev_ring ring;
65 struct vnic_wq_buf *bufs[VNIC_WQ_BUF_BLKS_MAX];
66 struct vnic_wq_buf *to_use;
67 struct vnic_wq_buf *to_clean;
68 unsigned int pkts_outstanding;
69};
70
71static inline unsigned int svnic_wq_desc_avail(struct vnic_wq *wq)
72{
73 /* how many does SW own? */
74 return wq->ring.desc_avail;
75}
76
77static inline unsigned int svnic_wq_desc_used(struct vnic_wq *wq)
78{
79 /* how many does HW own? */
80 return wq->ring.desc_count - wq->ring.desc_avail - 1;
81}
82
83static inline void *svnic_wq_next_desc(struct vnic_wq *wq)
84{
85 return wq->to_use->desc;
86}
87
88static inline void svnic_wq_post(struct vnic_wq *wq,
89 void *os_buf, dma_addr_t dma_addr,
90 unsigned int len, int sop, int eop)
91{
92 struct vnic_wq_buf *buf = wq->to_use;
93
94 buf->sop = sop;
95 buf->os_buf = eop ? os_buf : NULL;
96 buf->dma_addr = dma_addr;
97 buf->len = len;
98
99 buf = buf->next;
100 if (eop) {
101 /* Adding write memory barrier prevents compiler and/or CPU
102 * reordering, thus avoiding descriptor posting before
103 * descriptor is initialized. Otherwise, hardware can read
104 * stale descriptor fields.
105 */
106 wmb();
107 iowrite32(buf->index, &wq->ctrl->posted_index);
108 }
109 wq->to_use = buf;
110
111 wq->ring.desc_avail--;
112}
113
114static inline void svnic_wq_service(struct vnic_wq *wq,
115 struct cq_desc *cq_desc, u16 completed_index,
116 void (*buf_service)(struct vnic_wq *wq,
117 struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque),
118 void *opaque)
119{
120 struct vnic_wq_buf *buf;
121
122 buf = wq->to_clean;
123 while (1) {
124
125 (*buf_service)(wq, cq_desc, buf, opaque);
126
127 wq->ring.desc_avail++;
128
129 wq->to_clean = buf->next;
130
131 if (buf->index == completed_index)
132 break;
133
134 buf = wq->to_clean;
135 }
136}
137
138void svnic_wq_free(struct vnic_wq *wq);
139int svnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
140 unsigned int index, unsigned int desc_count, unsigned int desc_size);
141int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
142 unsigned int desc_count, unsigned int desc_size);
143void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
144 unsigned int fetch_index, unsigned int post_index,
145 unsigned int error_interrupt_enable,
146 unsigned int error_interrupt_offset);
147
148void svnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
149 unsigned int error_interrupt_enable,
150 unsigned int error_interrupt_offset);
151unsigned int svnic_wq_error_status(struct vnic_wq *wq);
152void svnic_wq_enable(struct vnic_wq *wq);
153int svnic_wq_disable(struct vnic_wq *wq);
154void svnic_wq_clean(struct vnic_wq *wq,
155 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf));
156#endif /* _VNIC_WQ_H_ */
157

source code of linux/drivers/scsi/snic/vnic_wq.h