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 */ |
12 | struct 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 | |
36 | struct 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 | |
60 | struct 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 | |
71 | static 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 | |
77 | static 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 | |
83 | static inline void *svnic_wq_next_desc(struct vnic_wq *wq) |
84 | { |
85 | return wq->to_use->desc; |
86 | } |
87 | |
88 | static 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 | |
114 | static 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 | |
138 | void svnic_wq_free(struct vnic_wq *wq); |
139 | int svnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, |
140 | unsigned int index, unsigned int desc_count, unsigned int desc_size); |
141 | int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, |
142 | unsigned int desc_count, unsigned int desc_size); |
143 | void 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 | |
148 | void svnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, |
149 | unsigned int error_interrupt_enable, |
150 | unsigned int error_interrupt_offset); |
151 | unsigned int svnic_wq_error_status(struct vnic_wq *wq); |
152 | void svnic_wq_enable(struct vnic_wq *wq); |
153 | int svnic_wq_disable(struct vnic_wq *wq); |
154 | void 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 | |