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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 | #include <linux/errno.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/pci.h> | |
22 | #include <linux/delay.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
5df6d737 AJ |
24 | #include "vnic_dev.h" |
25 | #include "vnic_rq.h" | |
26 | ||
27 | static int vnic_rq_alloc_bufs(struct vnic_rq *rq) | |
28 | { | |
29 | struct vnic_rq_buf *buf; | |
30 | struct vnic_dev *vdev; | |
31 | unsigned int i, j, count = rq->ring.desc_count; | |
32 | unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count); | |
33 | ||
34 | vdev = rq->vdev; | |
35 | ||
36 | for (i = 0; i < blks; i++) { | |
37 | rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC); | |
38 | if (!rq->bufs[i]) { | |
39 | printk(KERN_ERR "Failed to alloc rq_bufs\n"); | |
40 | return -ENOMEM; | |
41 | } | |
42 | } | |
43 | ||
44 | for (i = 0; i < blks; i++) { | |
45 | buf = rq->bufs[i]; | |
46 | for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) { | |
47 | buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j; | |
48 | buf->desc = (u8 *)rq->ring.descs + | |
49 | rq->ring.desc_size * buf->index; | |
50 | if (buf->index + 1 == count) { | |
51 | buf->next = rq->bufs[0]; | |
52 | break; | |
53 | } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) { | |
54 | buf->next = rq->bufs[i + 1]; | |
55 | } else { | |
56 | buf->next = buf + 1; | |
57 | buf++; | |
58 | } | |
59 | } | |
60 | } | |
61 | ||
62 | rq->to_use = rq->to_clean = rq->bufs[0]; | |
63 | rq->buf_index = 0; | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
68 | void vnic_rq_free(struct vnic_rq *rq) | |
69 | { | |
70 | struct vnic_dev *vdev; | |
71 | unsigned int i; | |
72 | ||
73 | vdev = rq->vdev; | |
74 | ||
75 | vnic_dev_free_desc_ring(vdev, &rq->ring); | |
76 | ||
77 | for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) { | |
78 | kfree(rq->bufs[i]); | |
79 | rq->bufs[i] = NULL; | |
80 | } | |
81 | ||
82 | rq->ctrl = NULL; | |
83 | } | |
84 | ||
85 | int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index, | |
86 | unsigned int desc_count, unsigned int desc_size) | |
87 | { | |
88 | int err; | |
89 | ||
90 | rq->index = index; | |
91 | rq->vdev = vdev; | |
92 | ||
93 | rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index); | |
94 | if (!rq->ctrl) { | |
95 | printk(KERN_ERR "Failed to hook RQ[%d] resource\n", index); | |
96 | return -EINVAL; | |
97 | } | |
98 | ||
99 | vnic_rq_disable(rq); | |
100 | ||
101 | err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size); | |
102 | if (err) | |
103 | return err; | |
104 | ||
105 | err = vnic_rq_alloc_bufs(rq); | |
106 | if (err) { | |
107 | vnic_rq_free(rq); | |
108 | return err; | |
109 | } | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index, | |
115 | unsigned int error_interrupt_enable, | |
116 | unsigned int error_interrupt_offset) | |
117 | { | |
118 | u64 paddr; | |
119 | u32 fetch_index; | |
120 | ||
121 | paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET; | |
122 | writeq(paddr, &rq->ctrl->ring_base); | |
123 | iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size); | |
124 | iowrite32(cq_index, &rq->ctrl->cq_index); | |
125 | iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable); | |
126 | iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset); | |
127 | iowrite32(0, &rq->ctrl->dropped_packet_count); | |
128 | iowrite32(0, &rq->ctrl->error_status); | |
129 | ||
130 | /* Use current fetch_index as the ring starting point */ | |
131 | fetch_index = ioread32(&rq->ctrl->fetch_index); | |
132 | rq->to_use = rq->to_clean = | |
133 | &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] | |
134 | [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; | |
135 | iowrite32(fetch_index, &rq->ctrl->posted_index); | |
136 | ||
137 | rq->buf_index = 0; | |
138 | } | |
139 | ||
140 | unsigned int vnic_rq_error_status(struct vnic_rq *rq) | |
141 | { | |
142 | return ioread32(&rq->ctrl->error_status); | |
143 | } | |
144 | ||
145 | void vnic_rq_enable(struct vnic_rq *rq) | |
146 | { | |
147 | iowrite32(1, &rq->ctrl->enable); | |
148 | } | |
149 | ||
150 | int vnic_rq_disable(struct vnic_rq *rq) | |
151 | { | |
152 | unsigned int wait; | |
153 | ||
154 | iowrite32(0, &rq->ctrl->enable); | |
155 | ||
156 | /* Wait for HW to ACK disable request */ | |
157 | for (wait = 0; wait < 100; wait++) { | |
158 | if (!(ioread32(&rq->ctrl->running))) | |
159 | return 0; | |
160 | udelay(1); | |
161 | } | |
162 | ||
163 | printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index); | |
164 | ||
165 | return -ETIMEDOUT; | |
166 | } | |
167 | ||
168 | void vnic_rq_clean(struct vnic_rq *rq, | |
169 | void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf)) | |
170 | { | |
171 | struct vnic_rq_buf *buf; | |
172 | u32 fetch_index; | |
173 | ||
174 | BUG_ON(ioread32(&rq->ctrl->enable)); | |
175 | ||
176 | buf = rq->to_clean; | |
177 | ||
178 | while (vnic_rq_desc_used(rq) > 0) { | |
179 | ||
180 | (*buf_clean)(rq, buf); | |
181 | ||
182 | buf = rq->to_clean = buf->next; | |
183 | rq->ring.desc_avail++; | |
184 | } | |
185 | ||
186 | /* Use current fetch_index as the ring starting point */ | |
187 | fetch_index = ioread32(&rq->ctrl->fetch_index); | |
188 | rq->to_use = rq->to_clean = | |
189 | &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES] | |
190 | [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES]; | |
191 | iowrite32(fetch_index, &rq->ctrl->posted_index); | |
192 | ||
193 | rq->buf_index = 0; | |
194 | ||
195 | vnic_dev_clear_desc_ring(&rq->ring); | |
196 | } | |
197 |