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