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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> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
01f2e4ea SF |
26 | |
27 | #include "vnic_dev.h" | |
28 | #include "vnic_rq.h" | |
29 | ||
30 | static int vnic_rq_alloc_bufs(struct vnic_rq *rq) | |
31 | { | |
32 | struct vnic_rq_buf *buf; | |
33 | struct vnic_dev *vdev; | |
34 | unsigned int i, j, count = rq->ring.desc_count; | |
35 | unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count); | |
36 | ||
37 | vdev = rq->vdev; | |
38 | ||
39 | for (i = 0; i < blks; i++) { | |
40 | rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC); | |
41 | if (!rq->bufs[i]) { | |
42 | printk(KERN_ERR "Failed to alloc rq_bufs\n"); | |
43 | return -ENOMEM; | |
44 | } | |
45 | } | |
46 | ||
47 | for (i = 0; i < blks; i++) { | |
48 | buf = rq->bufs[i]; | |
49 | for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) { | |
50 | buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j; | |
51 | buf->desc = (u8 *)rq->ring.descs + | |
52 | rq->ring.desc_size * buf->index; | |
53 | if (buf->index + 1 == count) { | |
54 | buf->next = rq->bufs[0]; | |
55 | break; | |
56 | } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) { | |
57 | buf->next = rq->bufs[i + 1]; | |
58 | } else { | |
59 | buf->next = buf + 1; | |
60 | buf++; | |
61 | } | |
62 | } | |
63 | } | |
64 | ||
65 | rq->to_use = rq->to_clean = rq->bufs[0]; | |
01f2e4ea SF |
66 | |
67 | return 0; | |
68 | } | |
69 | ||
70 | void vnic_rq_free(struct vnic_rq *rq) | |
71 | { | |
72 | struct vnic_dev *vdev; | |
73 | unsigned int i; | |
74 | ||
75 | vdev = rq->vdev; | |
76 | ||
77 | vnic_dev_free_desc_ring(vdev, &rq->ring); | |
78 | ||
79 | for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) { | |
80 | kfree(rq->bufs[i]); | |
81 | rq->bufs[i] = NULL; | |
82 | } | |
83 | ||
84 | rq->ctrl = NULL; | |
85 | } | |
86 | ||
87 | int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index, | |
88 | unsigned int desc_count, unsigned int desc_size) | |
89 | { | |
90 | int err; | |
91 | ||
92 | rq->index = index; | |
93 | rq->vdev = vdev; | |
94 | ||
95 | rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index); | |
96 | if (!rq->ctrl) { | |
97 | printk(KERN_ERR "Failed to hook RQ[%d] resource\n", index); | |
98 | return -EINVAL; | |
99 | } | |
100 | ||
101 | vnic_rq_disable(rq); | |
102 | ||
103 | err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size); | |
104 | if (err) | |
105 | return err; | |
106 | ||
107 | err = vnic_rq_alloc_bufs(rq); | |
108 | if (err) { | |
109 | vnic_rq_free(rq); | |
110 | return err; | |
111 | } | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
6fdfa970 SF |
116 | void vnic_rq_init_start(struct vnic_rq *rq, unsigned int cq_index, |
117 | unsigned int fetch_index, unsigned int posted_index, | |
01f2e4ea SF |
118 | unsigned int error_interrupt_enable, |
119 | unsigned int error_interrupt_offset) | |
120 | { | |
121 | u64 paddr; | |
01f2e4ea SF |
122 | |
123 | paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET; | |
124 | writeq(paddr, &rq->ctrl->ring_base); | |
125 | iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size); | |
126 | iowrite32(cq_index, &rq->ctrl->cq_index); | |
127 | iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable); | |
128 | iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset); | |
129 | iowrite32(0, &rq->ctrl->dropped_packet_count); | |
130 | iowrite32(0, &rq->ctrl->error_status); | |
6fdfa970 SF |
131 | iowrite32(fetch_index, &rq->ctrl->fetch_index); |
132 | iowrite32(posted_index, &rq->ctrl->posted_index); | |
01f2e4ea | 133 | |
01f2e4ea SF |
134 | rq->to_use = rq->to_clean = |
135 | &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] | |
136 | [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; | |
6fdfa970 SF |
137 | } |
138 | ||
139 | void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index, | |
140 | unsigned int error_interrupt_enable, | |
141 | unsigned int error_interrupt_offset) | |
142 | { | |
143 | u32 fetch_index; | |
01f2e4ea | 144 | |
6fdfa970 SF |
145 | /* Use current fetch_index as the ring starting point */ |
146 | fetch_index = ioread32(&rq->ctrl->fetch_index); | |
147 | ||
148 | vnic_rq_init_start(rq, cq_index, | |
149 | fetch_index, fetch_index, | |
150 | error_interrupt_enable, | |
151 | error_interrupt_offset); | |
01f2e4ea SF |
152 | } |
153 | ||
154 | unsigned int vnic_rq_error_status(struct vnic_rq *rq) | |
155 | { | |
156 | return ioread32(&rq->ctrl->error_status); | |
157 | } | |
158 | ||
159 | void vnic_rq_enable(struct vnic_rq *rq) | |
160 | { | |
161 | iowrite32(1, &rq->ctrl->enable); | |
162 | } | |
163 | ||
164 | int vnic_rq_disable(struct vnic_rq *rq) | |
165 | { | |
166 | unsigned int wait; | |
167 | ||
168 | iowrite32(0, &rq->ctrl->enable); | |
169 | ||
170 | /* Wait for HW to ACK disable request */ | |
b6d24eb6 | 171 | for (wait = 0; wait < 1000; wait++) { |
01f2e4ea SF |
172 | if (!(ioread32(&rq->ctrl->running))) |
173 | return 0; | |
b6d24eb6 | 174 | udelay(10); |
01f2e4ea SF |
175 | } |
176 | ||
177 | printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index); | |
178 | ||
179 | return -ETIMEDOUT; | |
180 | } | |
181 | ||
182 | void vnic_rq_clean(struct vnic_rq *rq, | |
183 | void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf)) | |
184 | { | |
185 | struct vnic_rq_buf *buf; | |
186 | u32 fetch_index; | |
187 | ||
188 | BUG_ON(ioread32(&rq->ctrl->enable)); | |
189 | ||
190 | buf = rq->to_clean; | |
191 | ||
192 | while (vnic_rq_desc_used(rq) > 0) { | |
193 | ||
194 | (*buf_clean)(rq, buf); | |
195 | ||
196 | buf = rq->to_clean = buf->next; | |
197 | rq->ring.desc_avail++; | |
198 | } | |
199 | ||
200 | /* Use current fetch_index as the ring starting point */ | |
201 | fetch_index = ioread32(&rq->ctrl->fetch_index); | |
202 | rq->to_use = rq->to_clean = | |
203 | &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] | |
204 | [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; | |
205 | iowrite32(fetch_index, &rq->ctrl->posted_index); | |
206 | ||
01f2e4ea SF |
207 | vnic_dev_clear_desc_ring(&rq->ring); |
208 | } | |
209 |