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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 | */ | |
19 | ||
20 | #include <linux/kernel.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/types.h> | |
23 | #include <linux/pci.h> | |
24 | #include <linux/delay.h> | |
25 | ||
26 | #include "vnic_dev.h" | |
27 | #include "vnic_rq.h" | |
28 | ||
29 | static int vnic_rq_alloc_bufs(struct vnic_rq *rq) | |
30 | { | |
31 | struct vnic_rq_buf *buf; | |
32 | struct vnic_dev *vdev; | |
33 | unsigned int i, j, count = rq->ring.desc_count; | |
34 | unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count); | |
35 | ||
36 | vdev = rq->vdev; | |
37 | ||
38 | for (i = 0; i < blks; i++) { | |
39 | rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC); | |
40 | if (!rq->bufs[i]) { | |
41 | printk(KERN_ERR "Failed to alloc rq_bufs\n"); | |
42 | return -ENOMEM; | |
43 | } | |
44 | } | |
45 | ||
46 | for (i = 0; i < blks; i++) { | |
47 | buf = rq->bufs[i]; | |
48 | for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) { | |
49 | buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j; | |
50 | buf->desc = (u8 *)rq->ring.descs + | |
51 | rq->ring.desc_size * buf->index; | |
52 | if (buf->index + 1 == count) { | |
53 | buf->next = rq->bufs[0]; | |
54 | break; | |
55 | } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) { | |
56 | buf->next = rq->bufs[i + 1]; | |
57 | } else { | |
58 | buf->next = buf + 1; | |
59 | buf++; | |
60 | } | |
61 | } | |
62 | } | |
63 | ||
64 | rq->to_use = rq->to_clean = rq->bufs[0]; | |
01f2e4ea SF |
65 | |
66 | return 0; | |
67 | } | |
68 | ||
69 | void vnic_rq_free(struct vnic_rq *rq) | |
70 | { | |
71 | struct vnic_dev *vdev; | |
72 | unsigned int i; | |
73 | ||
74 | vdev = rq->vdev; | |
75 | ||
76 | vnic_dev_free_desc_ring(vdev, &rq->ring); | |
77 | ||
78 | for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) { | |
79 | kfree(rq->bufs[i]); | |
80 | rq->bufs[i] = NULL; | |
81 | } | |
82 | ||
83 | rq->ctrl = NULL; | |
84 | } | |
85 | ||
86 | int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index, | |
87 | unsigned int desc_count, unsigned int desc_size) | |
88 | { | |
89 | int err; | |
90 | ||
91 | rq->index = index; | |
92 | rq->vdev = vdev; | |
93 | ||
94 | rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index); | |
95 | if (!rq->ctrl) { | |
96 | printk(KERN_ERR "Failed to hook RQ[%d] resource\n", index); | |
97 | return -EINVAL; | |
98 | } | |
99 | ||
100 | vnic_rq_disable(rq); | |
101 | ||
102 | err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size); | |
103 | if (err) | |
104 | return err; | |
105 | ||
106 | err = vnic_rq_alloc_bufs(rq); | |
107 | if (err) { | |
108 | vnic_rq_free(rq); | |
109 | return err; | |
110 | } | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
6fdfa970 SF |
115 | void vnic_rq_init_start(struct vnic_rq *rq, unsigned int cq_index, |
116 | unsigned int fetch_index, unsigned int posted_index, | |
01f2e4ea SF |
117 | unsigned int error_interrupt_enable, |
118 | unsigned int error_interrupt_offset) | |
119 | { | |
120 | u64 paddr; | |
01f2e4ea SF |
121 | |
122 | paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET; | |
123 | writeq(paddr, &rq->ctrl->ring_base); | |
124 | iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size); | |
125 | iowrite32(cq_index, &rq->ctrl->cq_index); | |
126 | iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable); | |
127 | iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset); | |
128 | iowrite32(0, &rq->ctrl->dropped_packet_count); | |
129 | iowrite32(0, &rq->ctrl->error_status); | |
6fdfa970 SF |
130 | iowrite32(fetch_index, &rq->ctrl->fetch_index); |
131 | iowrite32(posted_index, &rq->ctrl->posted_index); | |
01f2e4ea | 132 | |
01f2e4ea SF |
133 | rq->to_use = rq->to_clean = |
134 | &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] | |
135 | [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; | |
6fdfa970 SF |
136 | } |
137 | ||
138 | void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index, | |
139 | unsigned int error_interrupt_enable, | |
140 | unsigned int error_interrupt_offset) | |
141 | { | |
142 | u32 fetch_index; | |
01f2e4ea | 143 | |
6fdfa970 SF |
144 | /* Use current fetch_index as the ring starting point */ |
145 | fetch_index = ioread32(&rq->ctrl->fetch_index); | |
146 | ||
147 | vnic_rq_init_start(rq, cq_index, | |
148 | fetch_index, fetch_index, | |
149 | error_interrupt_enable, | |
150 | error_interrupt_offset); | |
01f2e4ea SF |
151 | } |
152 | ||
153 | unsigned int vnic_rq_error_status(struct vnic_rq *rq) | |
154 | { | |
155 | return ioread32(&rq->ctrl->error_status); | |
156 | } | |
157 | ||
158 | void vnic_rq_enable(struct vnic_rq *rq) | |
159 | { | |
160 | iowrite32(1, &rq->ctrl->enable); | |
161 | } | |
162 | ||
163 | int vnic_rq_disable(struct vnic_rq *rq) | |
164 | { | |
165 | unsigned int wait; | |
166 | ||
167 | iowrite32(0, &rq->ctrl->enable); | |
168 | ||
169 | /* Wait for HW to ACK disable request */ | |
170 | for (wait = 0; wait < 100; wait++) { | |
171 | if (!(ioread32(&rq->ctrl->running))) | |
172 | return 0; | |
173 | udelay(1); | |
174 | } | |
175 | ||
176 | printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index); | |
177 | ||
178 | return -ETIMEDOUT; | |
179 | } | |
180 | ||
181 | void vnic_rq_clean(struct vnic_rq *rq, | |
182 | void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf)) | |
183 | { | |
184 | struct vnic_rq_buf *buf; | |
185 | u32 fetch_index; | |
186 | ||
187 | BUG_ON(ioread32(&rq->ctrl->enable)); | |
188 | ||
189 | buf = rq->to_clean; | |
190 | ||
191 | while (vnic_rq_desc_used(rq) > 0) { | |
192 | ||
193 | (*buf_clean)(rq, buf); | |
194 | ||
195 | buf = rq->to_clean = buf->next; | |
196 | rq->ring.desc_avail++; | |
197 | } | |
198 | ||
199 | /* Use current fetch_index as the ring starting point */ | |
200 | fetch_index = ioread32(&rq->ctrl->fetch_index); | |
201 | rq->to_use = rq->to_clean = | |
202 | &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] | |
203 | [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; | |
204 | iowrite32(fetch_index, &rq->ctrl->posted_index); | |
205 | ||
01f2e4ea SF |
206 | vnic_dev_clear_desc_ring(&rq->ring); |
207 | } | |
208 |