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
vnic_rq_alloc_bufs(struct vnic_rq * rq)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];
65 rq->buf_index = 0;
66
67 return 0;
68 }
69
vnic_rq_free(struct vnic_rq * rq)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
vnic_rq_alloc(struct vnic_dev * vdev,struct vnic_rq * rq,unsigned int index,unsigned int desc_count,unsigned int desc_size)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
vnic_rq_init(struct vnic_rq * rq,unsigned int cq_index,unsigned int error_interrupt_enable,unsigned int error_interrupt_offset)116 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
117 unsigned int error_interrupt_enable,
118 unsigned int error_interrupt_offset)
119 {
120 u64 paddr;
121 u32 fetch_index;
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);
131
132 /* Use current fetch_index as the ring starting point */
133 fetch_index = ioread32(&rq->ctrl->fetch_index);
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];
137 iowrite32(fetch_index, &rq->ctrl->posted_index);
138
139 rq->buf_index = 0;
140 }
141
vnic_rq_error_status(struct vnic_rq * rq)142 unsigned int vnic_rq_error_status(struct vnic_rq *rq)
143 {
144 return ioread32(&rq->ctrl->error_status);
145 }
146
vnic_rq_enable(struct vnic_rq * rq)147 void vnic_rq_enable(struct vnic_rq *rq)
148 {
149 iowrite32(1, &rq->ctrl->enable);
150 }
151
vnic_rq_disable(struct vnic_rq * rq)152 int vnic_rq_disable(struct vnic_rq *rq)
153 {
154 unsigned int wait;
155
156 iowrite32(0, &rq->ctrl->enable);
157
158 /* Wait for HW to ACK disable request */
159 for (wait = 0; wait < 100; wait++) {
160 if (!(ioread32(&rq->ctrl->running)))
161 return 0;
162 udelay(1);
163 }
164
165 printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index);
166
167 return -ETIMEDOUT;
168 }
169
vnic_rq_clean(struct vnic_rq * rq,void (* buf_clean)(struct vnic_rq * rq,struct vnic_rq_buf * buf))170 void vnic_rq_clean(struct vnic_rq *rq,
171 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
172 {
173 struct vnic_rq_buf *buf;
174 u32 fetch_index;
175
176 BUG_ON(ioread32(&rq->ctrl->enable));
177
178 buf = rq->to_clean;
179
180 while (vnic_rq_desc_used(rq) > 0) {
181
182 (*buf_clean)(rq, buf);
183
184 buf = rq->to_clean = buf->next;
185 rq->ring.desc_avail++;
186 }
187
188 /* Use current fetch_index as the ring starting point */
189 fetch_index = ioread32(&rq->ctrl->fetch_index);
190 rq->to_use = rq->to_clean =
191 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
192 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
193 iowrite32(fetch_index, &rq->ctrl->posted_index);
194
195 rq->buf_index = 0;
196
197 vnic_dev_clear_desc_ring(&rq->ring);
198 }
199
200