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1 | /* |
2 | * Copyright 2008 Cisco Systems, Inc. All rights reserved. | |
3 | * Copyright 2007 Nuova Systems, Inc. All rights reserved. | |
4 | * | |
5 | * This program is free software; you may redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; version 2 of the License. | |
8 | * | |
9 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
10 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
11 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
12 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
13 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
14 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
15 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
16 | * SOFTWARE. | |
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 | /* | |
26 | * These defines avoid symbol clash between fnic and enic (Cisco 10G Eth | |
27 | * Driver) when both are built with CONFIG options =y | |
28 | */ | |
29 | #define vnic_wq_desc_avail fnic_wq_desc_avail | |
30 | #define vnic_wq_desc_used fnic_wq_desc_used | |
31 | #define vnic_wq_next_desc fni_cwq_next_desc | |
32 | #define vnic_wq_post fnic_wq_post | |
33 | #define vnic_wq_service fnic_wq_service | |
34 | #define vnic_wq_free fnic_wq_free | |
35 | #define vnic_wq_alloc fnic_wq_alloc | |
36 | #define vnic_wq_init fnic_wq_init | |
37 | #define vnic_wq_error_status fnic_wq_error_status | |
38 | #define vnic_wq_enable fnic_wq_enable | |
39 | #define vnic_wq_disable fnic_wq_disable | |
40 | #define vnic_wq_clean fnic_wq_clean | |
41 | ||
42 | /* Work queue control */ | |
43 | struct vnic_wq_ctrl { | |
44 | u64 ring_base; /* 0x00 */ | |
45 | u32 ring_size; /* 0x08 */ | |
46 | u32 pad0; | |
47 | u32 posted_index; /* 0x10 */ | |
48 | u32 pad1; | |
49 | u32 cq_index; /* 0x18 */ | |
50 | u32 pad2; | |
51 | u32 enable; /* 0x20 */ | |
52 | u32 pad3; | |
53 | u32 running; /* 0x28 */ | |
54 | u32 pad4; | |
55 | u32 fetch_index; /* 0x30 */ | |
56 | u32 pad5; | |
57 | u32 dca_value; /* 0x38 */ | |
58 | u32 pad6; | |
59 | u32 error_interrupt_enable; /* 0x40 */ | |
60 | u32 pad7; | |
61 | u32 error_interrupt_offset; /* 0x48 */ | |
62 | u32 pad8; | |
63 | u32 error_status; /* 0x50 */ | |
64 | u32 pad9; | |
65 | }; | |
66 | ||
67 | struct vnic_wq_buf { | |
68 | struct vnic_wq_buf *next; | |
69 | dma_addr_t dma_addr; | |
70 | void *os_buf; | |
71 | unsigned int len; | |
72 | unsigned int index; | |
73 | int sop; | |
74 | void *desc; | |
75 | }; | |
76 | ||
77 | /* Break the vnic_wq_buf allocations into blocks of 64 entries */ | |
78 | #define VNIC_WQ_BUF_BLK_ENTRIES 64 | |
79 | #define VNIC_WQ_BUF_BLK_SZ \ | |
80 | (VNIC_WQ_BUF_BLK_ENTRIES * sizeof(struct vnic_wq_buf)) | |
81 | #define VNIC_WQ_BUF_BLKS_NEEDED(entries) \ | |
82 | DIV_ROUND_UP(entries, VNIC_WQ_BUF_BLK_ENTRIES) | |
83 | #define VNIC_WQ_BUF_BLKS_MAX VNIC_WQ_BUF_BLKS_NEEDED(4096) | |
84 | ||
85 | struct vnic_wq { | |
86 | unsigned int index; | |
87 | struct vnic_dev *vdev; | |
88 | struct vnic_wq_ctrl __iomem *ctrl; /* memory-mapped */ | |
89 | struct vnic_dev_ring ring; | |
90 | struct vnic_wq_buf *bufs[VNIC_WQ_BUF_BLKS_MAX]; | |
91 | struct vnic_wq_buf *to_use; | |
92 | struct vnic_wq_buf *to_clean; | |
93 | unsigned int pkts_outstanding; | |
94 | }; | |
95 | ||
96 | static inline unsigned int vnic_wq_desc_avail(struct vnic_wq *wq) | |
97 | { | |
98 | /* how many does SW own? */ | |
99 | return wq->ring.desc_avail; | |
100 | } | |
101 | ||
102 | static inline unsigned int vnic_wq_desc_used(struct vnic_wq *wq) | |
103 | { | |
104 | /* how many does HW own? */ | |
105 | return wq->ring.desc_count - wq->ring.desc_avail - 1; | |
106 | } | |
107 | ||
108 | static inline void *vnic_wq_next_desc(struct vnic_wq *wq) | |
109 | { | |
110 | return wq->to_use->desc; | |
111 | } | |
112 | ||
113 | static inline void vnic_wq_post(struct vnic_wq *wq, | |
114 | void *os_buf, dma_addr_t dma_addr, | |
115 | unsigned int len, int sop, int eop) | |
116 | { | |
117 | struct vnic_wq_buf *buf = wq->to_use; | |
118 | ||
119 | buf->sop = sop; | |
120 | buf->os_buf = eop ? os_buf : NULL; | |
121 | buf->dma_addr = dma_addr; | |
122 | buf->len = len; | |
123 | ||
124 | buf = buf->next; | |
125 | if (eop) { | |
126 | /* Adding write memory barrier prevents compiler and/or CPU | |
127 | * reordering, thus avoiding descriptor posting before | |
128 | * descriptor is initialized. Otherwise, hardware can read | |
129 | * stale descriptor fields. | |
130 | */ | |
131 | wmb(); | |
132 | iowrite32(buf->index, &wq->ctrl->posted_index); | |
133 | } | |
134 | wq->to_use = buf; | |
135 | ||
136 | wq->ring.desc_avail--; | |
137 | } | |
138 | ||
139 | static inline void vnic_wq_service(struct vnic_wq *wq, | |
140 | struct cq_desc *cq_desc, u16 completed_index, | |
141 | void (*buf_service)(struct vnic_wq *wq, | |
142 | struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque), | |
143 | void *opaque) | |
144 | { | |
145 | struct vnic_wq_buf *buf; | |
146 | ||
147 | buf = wq->to_clean; | |
148 | while (1) { | |
149 | ||
150 | (*buf_service)(wq, cq_desc, buf, opaque); | |
151 | ||
152 | wq->ring.desc_avail++; | |
153 | ||
154 | wq->to_clean = buf->next; | |
155 | ||
156 | if (buf->index == completed_index) | |
157 | break; | |
158 | ||
159 | buf = wq->to_clean; | |
160 | } | |
161 | } | |
162 | ||
163 | void vnic_wq_free(struct vnic_wq *wq); | |
164 | int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index, | |
165 | unsigned int desc_count, unsigned int desc_size); | |
166 | void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, | |
167 | unsigned int error_interrupt_enable, | |
168 | unsigned int error_interrupt_offset); | |
169 | unsigned int vnic_wq_error_status(struct vnic_wq *wq); | |
170 | void vnic_wq_enable(struct vnic_wq *wq); | |
171 | int vnic_wq_disable(struct vnic_wq *wq); | |
172 | void vnic_wq_clean(struct vnic_wq *wq, | |
173 | void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)); | |
174 | ||
175 | #endif /* _VNIC_WQ_H_ */ |