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c8806b6c NM |
1 | /* |
2 | * Copyright 2014 Cisco Systems, Inc. All rights reserved. | |
3 | * | |
4 | * This program is free software; you may redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; version 2 of the License. | |
7 | * | |
8 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
9 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
10 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
11 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
12 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
13 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
14 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
15 | * SOFTWARE. | |
16 | */ | |
17 | ||
18 | #ifndef _VNIC_WQ_H_ | |
19 | #define _VNIC_WQ_H_ | |
20 | ||
21 | #include <linux/pci.h> | |
22 | #include "vnic_dev.h" | |
23 | #include "vnic_cq.h" | |
24 | ||
25 | /* Work queue control */ | |
26 | struct vnic_wq_ctrl { | |
27 | u64 ring_base; /* 0x00 */ | |
28 | u32 ring_size; /* 0x08 */ | |
29 | u32 pad0; | |
30 | u32 posted_index; /* 0x10 */ | |
31 | u32 pad1; | |
32 | u32 cq_index; /* 0x18 */ | |
33 | u32 pad2; | |
34 | u32 enable; /* 0x20 */ | |
35 | u32 pad3; | |
36 | u32 running; /* 0x28 */ | |
37 | u32 pad4; | |
38 | u32 fetch_index; /* 0x30 */ | |
39 | u32 pad5; | |
40 | u32 dca_value; /* 0x38 */ | |
41 | u32 pad6; | |
42 | u32 error_interrupt_enable; /* 0x40 */ | |
43 | u32 pad7; | |
44 | u32 error_interrupt_offset; /* 0x48 */ | |
45 | u32 pad8; | |
46 | u32 error_status; /* 0x50 */ | |
47 | u32 pad9; | |
48 | }; | |
49 | ||
50 | struct vnic_wq_buf { | |
51 | struct vnic_wq_buf *next; | |
52 | dma_addr_t dma_addr; | |
53 | void *os_buf; | |
54 | unsigned int len; | |
55 | unsigned int index; | |
56 | int sop; | |
57 | void *desc; | |
58 | }; | |
59 | ||
60 | /* Break the vnic_wq_buf allocations into blocks of 64 entries */ | |
61 | #define VNIC_WQ_BUF_MIN_BLK_ENTRIES 32 | |
62 | #define VNIC_WQ_BUF_DFLT_BLK_ENTRIES 64 | |
63 | #define VNIC_WQ_BUF_BLK_ENTRIES(entries) \ | |
64 | ((unsigned int)(entries < VNIC_WQ_BUF_DFLT_BLK_ENTRIES) ? \ | |
65 | VNIC_WQ_BUF_MIN_BLK_ENTRIES : VNIC_WQ_BUF_DFLT_BLK_ENTRIES) | |
66 | #define VNIC_WQ_BUF_BLK_SZ \ | |
67 | (VNIC_WQ_BUF_DFLT_BLK_ENTRIES * sizeof(struct vnic_wq_buf)) | |
68 | #define VNIC_WQ_BUF_BLKS_NEEDED(entries) \ | |
69 | DIV_ROUND_UP(entries, VNIC_WQ_BUF_DFLT_BLK_ENTRIES) | |
70 | #define VNIC_WQ_BUF_BLKS_NEEDED(entries) \ | |
71 | DIV_ROUND_UP(entries, VNIC_WQ_BUF_DFLT_BLK_ENTRIES) | |
72 | #define VNIC_WQ_BUF_BLKS_MAX VNIC_WQ_BUF_BLKS_NEEDED(4096) | |
73 | ||
74 | struct vnic_wq { | |
75 | unsigned int index; | |
76 | struct vnic_dev *vdev; | |
77 | struct vnic_wq_ctrl __iomem *ctrl; /* memory-mapped */ | |
78 | struct vnic_dev_ring ring; | |
79 | struct vnic_wq_buf *bufs[VNIC_WQ_BUF_BLKS_MAX]; | |
80 | struct vnic_wq_buf *to_use; | |
81 | struct vnic_wq_buf *to_clean; | |
82 | unsigned int pkts_outstanding; | |
83 | }; | |
84 | ||
85 | static inline unsigned int svnic_wq_desc_avail(struct vnic_wq *wq) | |
86 | { | |
87 | /* how many does SW own? */ | |
88 | return wq->ring.desc_avail; | |
89 | } | |
90 | ||
91 | static inline unsigned int svnic_wq_desc_used(struct vnic_wq *wq) | |
92 | { | |
93 | /* how many does HW own? */ | |
94 | return wq->ring.desc_count - wq->ring.desc_avail - 1; | |
95 | } | |
96 | ||
97 | static inline void *svnic_wq_next_desc(struct vnic_wq *wq) | |
98 | { | |
99 | return wq->to_use->desc; | |
100 | } | |
101 | ||
102 | static inline void svnic_wq_post(struct vnic_wq *wq, | |
103 | void *os_buf, dma_addr_t dma_addr, | |
104 | unsigned int len, int sop, int eop) | |
105 | { | |
106 | struct vnic_wq_buf *buf = wq->to_use; | |
107 | ||
108 | buf->sop = sop; | |
109 | buf->os_buf = eop ? os_buf : NULL; | |
110 | buf->dma_addr = dma_addr; | |
111 | buf->len = len; | |
112 | ||
113 | buf = buf->next; | |
114 | if (eop) { | |
115 | /* Adding write memory barrier prevents compiler and/or CPU | |
116 | * reordering, thus avoiding descriptor posting before | |
117 | * descriptor is initialized. Otherwise, hardware can read | |
118 | * stale descriptor fields. | |
119 | */ | |
120 | wmb(); | |
121 | iowrite32(buf->index, &wq->ctrl->posted_index); | |
122 | } | |
123 | wq->to_use = buf; | |
124 | ||
125 | wq->ring.desc_avail--; | |
126 | } | |
127 | ||
128 | static inline void svnic_wq_service(struct vnic_wq *wq, | |
129 | struct cq_desc *cq_desc, u16 completed_index, | |
130 | void (*buf_service)(struct vnic_wq *wq, | |
131 | struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque), | |
132 | void *opaque) | |
133 | { | |
134 | struct vnic_wq_buf *buf; | |
135 | ||
136 | buf = wq->to_clean; | |
137 | while (1) { | |
138 | ||
139 | (*buf_service)(wq, cq_desc, buf, opaque); | |
140 | ||
141 | wq->ring.desc_avail++; | |
142 | ||
143 | wq->to_clean = buf->next; | |
144 | ||
145 | if (buf->index == completed_index) | |
146 | break; | |
147 | ||
148 | buf = wq->to_clean; | |
149 | } | |
150 | } | |
151 | ||
152 | void svnic_wq_free(struct vnic_wq *wq); | |
153 | int svnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, | |
154 | unsigned int index, unsigned int desc_count, unsigned int desc_size); | |
155 | int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, | |
156 | unsigned int desc_count, unsigned int desc_size); | |
157 | void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index, | |
158 | unsigned int fetch_index, unsigned int post_index, | |
159 | unsigned int error_interrupt_enable, | |
160 | unsigned int error_interrupt_offset); | |
161 | ||
162 | void svnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, | |
163 | unsigned int error_interrupt_enable, | |
164 | unsigned int error_interrupt_offset); | |
165 | unsigned int svnic_wq_error_status(struct vnic_wq *wq); | |
166 | void svnic_wq_enable(struct vnic_wq *wq); | |
167 | int svnic_wq_disable(struct vnic_wq *wq); | |
168 | void svnic_wq_clean(struct vnic_wq *wq, | |
169 | void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)); | |
170 | #endif /* _VNIC_WQ_H_ */ |