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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_RQ_H_ | |
19 | #define _VNIC_RQ_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_rq_desc_avail fnic_rq_desc_avail | |
30 | #define vnic_rq_desc_used fnic_rq_desc_used | |
31 | #define vnic_rq_next_desc fnic_rq_next_desc | |
32 | #define vnic_rq_next_index fnic_rq_next_index | |
33 | #define vnic_rq_next_buf_index fnic_rq_next_buf_index | |
34 | #define vnic_rq_post fnic_rq_post | |
35 | #define vnic_rq_posting_soon fnic_rq_posting_soon | |
36 | #define vnic_rq_return_descs fnic_rq_return_descs | |
37 | #define vnic_rq_service fnic_rq_service | |
38 | #define vnic_rq_fill fnic_rq_fill | |
39 | #define vnic_rq_free fnic_rq_free | |
40 | #define vnic_rq_alloc fnic_rq_alloc | |
41 | #define vnic_rq_init fnic_rq_init | |
42 | #define vnic_rq_error_status fnic_rq_error_status | |
43 | #define vnic_rq_enable fnic_rq_enable | |
44 | #define vnic_rq_disable fnic_rq_disable | |
45 | #define vnic_rq_clean fnic_rq_clean | |
46 | ||
47 | /* Receive queue control */ | |
48 | struct vnic_rq_ctrl { | |
49 | u64 ring_base; /* 0x00 */ | |
50 | u32 ring_size; /* 0x08 */ | |
51 | u32 pad0; | |
52 | u32 posted_index; /* 0x10 */ | |
53 | u32 pad1; | |
54 | u32 cq_index; /* 0x18 */ | |
55 | u32 pad2; | |
56 | u32 enable; /* 0x20 */ | |
57 | u32 pad3; | |
58 | u32 running; /* 0x28 */ | |
59 | u32 pad4; | |
60 | u32 fetch_index; /* 0x30 */ | |
61 | u32 pad5; | |
62 | u32 error_interrupt_enable; /* 0x38 */ | |
63 | u32 pad6; | |
64 | u32 error_interrupt_offset; /* 0x40 */ | |
65 | u32 pad7; | |
66 | u32 error_status; /* 0x48 */ | |
67 | u32 pad8; | |
68 | u32 dropped_packet_count; /* 0x50 */ | |
69 | u32 pad9; | |
70 | u32 dropped_packet_count_rc; /* 0x58 */ | |
71 | u32 pad10; | |
72 | }; | |
73 | ||
74 | /* Break the vnic_rq_buf allocations into blocks of 64 entries */ | |
75 | #define VNIC_RQ_BUF_BLK_ENTRIES 64 | |
76 | #define VNIC_RQ_BUF_BLK_SZ \ | |
77 | (VNIC_RQ_BUF_BLK_ENTRIES * sizeof(struct vnic_rq_buf)) | |
78 | #define VNIC_RQ_BUF_BLKS_NEEDED(entries) \ | |
79 | DIV_ROUND_UP(entries, VNIC_RQ_BUF_BLK_ENTRIES) | |
80 | #define VNIC_RQ_BUF_BLKS_MAX VNIC_RQ_BUF_BLKS_NEEDED(4096) | |
81 | ||
82 | struct vnic_rq_buf { | |
83 | struct vnic_rq_buf *next; | |
84 | dma_addr_t dma_addr; | |
85 | void *os_buf; | |
86 | unsigned int os_buf_index; | |
87 | unsigned int len; | |
88 | unsigned int index; | |
89 | void *desc; | |
90 | }; | |
91 | ||
92 | struct vnic_rq { | |
93 | unsigned int index; | |
94 | struct vnic_dev *vdev; | |
95 | struct vnic_rq_ctrl __iomem *ctrl; /* memory-mapped */ | |
96 | struct vnic_dev_ring ring; | |
97 | struct vnic_rq_buf *bufs[VNIC_RQ_BUF_BLKS_MAX]; | |
98 | struct vnic_rq_buf *to_use; | |
99 | struct vnic_rq_buf *to_clean; | |
100 | void *os_buf_head; | |
101 | unsigned int buf_index; | |
102 | unsigned int pkts_outstanding; | |
103 | }; | |
104 | ||
105 | static inline unsigned int vnic_rq_desc_avail(struct vnic_rq *rq) | |
106 | { | |
107 | /* how many does SW own? */ | |
108 | return rq->ring.desc_avail; | |
109 | } | |
110 | ||
111 | static inline unsigned int vnic_rq_desc_used(struct vnic_rq *rq) | |
112 | { | |
113 | /* how many does HW own? */ | |
114 | return rq->ring.desc_count - rq->ring.desc_avail - 1; | |
115 | } | |
116 | ||
117 | static inline void *vnic_rq_next_desc(struct vnic_rq *rq) | |
118 | { | |
119 | return rq->to_use->desc; | |
120 | } | |
121 | ||
122 | static inline unsigned int vnic_rq_next_index(struct vnic_rq *rq) | |
123 | { | |
124 | return rq->to_use->index; | |
125 | } | |
126 | ||
127 | static inline unsigned int vnic_rq_next_buf_index(struct vnic_rq *rq) | |
128 | { | |
129 | return rq->buf_index++; | |
130 | } | |
131 | ||
132 | static inline void vnic_rq_post(struct vnic_rq *rq, | |
133 | void *os_buf, unsigned int os_buf_index, | |
134 | dma_addr_t dma_addr, unsigned int len) | |
135 | { | |
136 | struct vnic_rq_buf *buf = rq->to_use; | |
137 | ||
138 | buf->os_buf = os_buf; | |
139 | buf->os_buf_index = os_buf_index; | |
140 | buf->dma_addr = dma_addr; | |
141 | buf->len = len; | |
142 | ||
143 | buf = buf->next; | |
144 | rq->to_use = buf; | |
145 | rq->ring.desc_avail--; | |
146 | ||
147 | /* Move the posted_index every nth descriptor | |
148 | */ | |
149 | ||
150 | #ifndef VNIC_RQ_RETURN_RATE | |
151 | #define VNIC_RQ_RETURN_RATE 0xf /* keep 2^n - 1 */ | |
152 | #endif | |
153 | ||
154 | if ((buf->index & VNIC_RQ_RETURN_RATE) == 0) { | |
155 | /* Adding write memory barrier prevents compiler and/or CPU | |
156 | * reordering, thus avoiding descriptor posting before | |
157 | * descriptor is initialized. Otherwise, hardware can read | |
158 | * stale descriptor fields. | |
159 | */ | |
160 | wmb(); | |
161 | iowrite32(buf->index, &rq->ctrl->posted_index); | |
162 | } | |
163 | } | |
164 | ||
165 | static inline int vnic_rq_posting_soon(struct vnic_rq *rq) | |
166 | { | |
167 | return (rq->to_use->index & VNIC_RQ_RETURN_RATE) == 0; | |
168 | } | |
169 | ||
170 | static inline void vnic_rq_return_descs(struct vnic_rq *rq, unsigned int count) | |
171 | { | |
172 | rq->ring.desc_avail += count; | |
173 | } | |
174 | ||
175 | enum desc_return_options { | |
176 | VNIC_RQ_RETURN_DESC, | |
177 | VNIC_RQ_DEFER_RETURN_DESC, | |
178 | }; | |
179 | ||
180 | static inline void vnic_rq_service(struct vnic_rq *rq, | |
181 | struct cq_desc *cq_desc, u16 completed_index, | |
182 | int desc_return, void (*buf_service)(struct vnic_rq *rq, | |
183 | struct cq_desc *cq_desc, struct vnic_rq_buf *buf, | |
184 | int skipped, void *opaque), void *opaque) | |
185 | { | |
186 | struct vnic_rq_buf *buf; | |
187 | int skipped; | |
188 | ||
189 | buf = rq->to_clean; | |
190 | while (1) { | |
191 | ||
192 | skipped = (buf->index != completed_index); | |
193 | ||
194 | (*buf_service)(rq, cq_desc, buf, skipped, opaque); | |
195 | ||
196 | if (desc_return == VNIC_RQ_RETURN_DESC) | |
197 | rq->ring.desc_avail++; | |
198 | ||
199 | rq->to_clean = buf->next; | |
200 | ||
201 | if (!skipped) | |
202 | break; | |
203 | ||
204 | buf = rq->to_clean; | |
205 | } | |
206 | } | |
207 | ||
208 | static inline int vnic_rq_fill(struct vnic_rq *rq, | |
209 | int (*buf_fill)(struct vnic_rq *rq)) | |
210 | { | |
211 | int err; | |
212 | ||
213 | while (vnic_rq_desc_avail(rq) > 1) { | |
214 | ||
215 | err = (*buf_fill)(rq); | |
216 | if (err) | |
217 | return err; | |
218 | } | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | void vnic_rq_free(struct vnic_rq *rq); | |
224 | int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index, | |
225 | unsigned int desc_count, unsigned int desc_size); | |
226 | void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index, | |
227 | unsigned int error_interrupt_enable, | |
228 | unsigned int error_interrupt_offset); | |
229 | unsigned int vnic_rq_error_status(struct vnic_rq *rq); | |
230 | void vnic_rq_enable(struct vnic_rq *rq); | |
231 | int vnic_rq_disable(struct vnic_rq *rq); | |
232 | void vnic_rq_clean(struct vnic_rq *rq, | |
233 | void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf)); | |
234 | ||
235 | #endif /* _VNIC_RQ_H_ */ |