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