1 /*
2 * Copyright 2008-2010 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 #include <linux/slab.h>
26
27 #include "vnic_dev.h"
28 #include "vnic_wq.h"
29 #include "enic.h"
30
vnic_wq_alloc_bufs(struct vnic_wq * wq)31 static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
32 {
33 struct vnic_wq_buf *buf;
34 unsigned int i, j, count = wq->ring.desc_count;
35 unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
36
37 for (i = 0; i < blks; i++) {
38 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_KERNEL);
39 if (!wq->bufs[i])
40 return -ENOMEM;
41 }
42
43 for (i = 0; i < blks; i++) {
44 buf = wq->bufs[i];
45 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) {
46 buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j;
47 buf->desc = (u8 *)wq->ring.descs +
48 wq->ring.desc_size * buf->index;
49 if (buf->index + 1 == count) {
50 buf->next = wq->bufs[0];
51 buf->next->prev = buf;
52 break;
53 } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {
54 buf->next = wq->bufs[i + 1];
55 buf->next->prev = buf;
56 } else {
57 buf->next = buf + 1;
58 buf->next->prev = buf;
59 buf++;
60 }
61 }
62 }
63
64 wq->to_use = wq->to_clean = wq->bufs[0];
65
66 return 0;
67 }
68
vnic_wq_free(struct vnic_wq * wq)69 void vnic_wq_free(struct vnic_wq *wq)
70 {
71 struct vnic_dev *vdev;
72 unsigned int i;
73
74 vdev = wq->vdev;
75
76 vnic_dev_free_desc_ring(vdev, &wq->ring);
77
78 for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
79 if (wq->bufs[i]) {
80 kfree(wq->bufs[i]);
81 wq->bufs[i] = NULL;
82 }
83 }
84
85 wq->ctrl = NULL;
86 }
87
vnic_wq_alloc(struct vnic_dev * vdev,struct vnic_wq * wq,unsigned int index,unsigned int desc_count,unsigned int desc_size)88 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
89 unsigned int desc_count, unsigned int desc_size)
90 {
91 int err;
92
93 wq->index = index;
94 wq->vdev = vdev;
95
96 wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
97 if (!wq->ctrl) {
98 vdev_err(vdev, "Failed to hook WQ[%d] resource\n", index);
99 return -EINVAL;
100 }
101
102 vnic_wq_disable(wq);
103
104 err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
105 if (err)
106 return err;
107
108 err = vnic_wq_alloc_bufs(wq);
109 if (err) {
110 vnic_wq_free(wq);
111 return err;
112 }
113
114 return 0;
115 }
116
enic_wq_devcmd2_alloc(struct vnic_dev * vdev,struct vnic_wq * wq,unsigned int desc_count,unsigned int desc_size)117 int enic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
118 unsigned int desc_count, unsigned int desc_size)
119 {
120 int err;
121
122 wq->index = 0;
123 wq->vdev = vdev;
124
125 wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
126 if (!wq->ctrl)
127 return -EINVAL;
128 vnic_wq_disable(wq);
129 err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
130
131 return err;
132 }
133
enic_wq_init_start(struct vnic_wq * wq,unsigned int cq_index,unsigned int fetch_index,unsigned int posted_index,unsigned int error_interrupt_enable,unsigned int error_interrupt_offset)134 void enic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
135 unsigned int fetch_index, unsigned int posted_index,
136 unsigned int error_interrupt_enable,
137 unsigned int error_interrupt_offset)
138 {
139 u64 paddr;
140 unsigned int count = wq->ring.desc_count;
141
142 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
143 writeq(paddr, &wq->ctrl->ring_base);
144 iowrite32(count, &wq->ctrl->ring_size);
145 iowrite32(fetch_index, &wq->ctrl->fetch_index);
146 iowrite32(posted_index, &wq->ctrl->posted_index);
147 iowrite32(cq_index, &wq->ctrl->cq_index);
148 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
149 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
150 iowrite32(0, &wq->ctrl->error_status);
151
152 wq->to_use = wq->to_clean =
153 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
154 [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
155 }
156
vnic_wq_init(struct vnic_wq * wq,unsigned int cq_index,unsigned int error_interrupt_enable,unsigned int error_interrupt_offset)157 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
158 unsigned int error_interrupt_enable,
159 unsigned int error_interrupt_offset)
160 {
161 enic_wq_init_start(wq, cq_index, 0, 0,
162 error_interrupt_enable,
163 error_interrupt_offset);
164 }
165
vnic_wq_error_status(struct vnic_wq * wq)166 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
167 {
168 return ioread32(&wq->ctrl->error_status);
169 }
170
vnic_wq_enable(struct vnic_wq * wq)171 void vnic_wq_enable(struct vnic_wq *wq)
172 {
173 iowrite32(1, &wq->ctrl->enable);
174 }
175
vnic_wq_disable(struct vnic_wq * wq)176 int vnic_wq_disable(struct vnic_wq *wq)
177 {
178 unsigned int wait;
179 struct vnic_dev *vdev = wq->vdev;
180
181 iowrite32(0, &wq->ctrl->enable);
182
183 /* Wait for HW to ACK disable request */
184 for (wait = 0; wait < 1000; wait++) {
185 if (!(ioread32(&wq->ctrl->running)))
186 return 0;
187 udelay(10);
188 }
189
190 vdev_neterr(vdev, "Failed to disable WQ[%d]\n", wq->index);
191
192 return -ETIMEDOUT;
193 }
194
vnic_wq_clean(struct vnic_wq * wq,void (* buf_clean)(struct vnic_wq * wq,struct vnic_wq_buf * buf))195 void vnic_wq_clean(struct vnic_wq *wq,
196 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
197 {
198 struct vnic_wq_buf *buf;
199
200 buf = wq->to_clean;
201
202 while (vnic_wq_desc_used(wq) > 0) {
203
204 (*buf_clean)(wq, buf);
205
206 buf = wq->to_clean = buf->next;
207 wq->ring.desc_avail++;
208 }
209
210 wq->to_use = wq->to_clean = wq->bufs[0];
211
212 iowrite32(0, &wq->ctrl->fetch_index);
213 iowrite32(0, &wq->ctrl->posted_index);
214 iowrite32(0, &wq->ctrl->error_status);
215
216 vnic_dev_clear_desc_ring(&wq->ring);
217 }
218