blob: bedd0d285630287ffc1b5d5cc379437cd3da4734 [file] [log] [blame]
Abhijeet Joglekar5df6d732009-04-17 18:33:26 -07001/*
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 "vnic_dev.h"
24#include "vnic_rq.h"
25
26static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
27{
28 struct vnic_rq_buf *buf;
29 struct vnic_dev *vdev;
30 unsigned int i, j, count = rq->ring.desc_count;
31 unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
32
33 vdev = rq->vdev;
34
35 for (i = 0; i < blks; i++) {
36 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC);
37 if (!rq->bufs[i]) {
38 printk(KERN_ERR "Failed to alloc rq_bufs\n");
39 return -ENOMEM;
40 }
41 }
42
43 for (i = 0; i < blks; i++) {
44 buf = rq->bufs[i];
45 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) {
46 buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j;
47 buf->desc = (u8 *)rq->ring.descs +
48 rq->ring.desc_size * buf->index;
49 if (buf->index + 1 == count) {
50 buf->next = rq->bufs[0];
51 break;
52 } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) {
53 buf->next = rq->bufs[i + 1];
54 } else {
55 buf->next = buf + 1;
56 buf++;
57 }
58 }
59 }
60
61 rq->to_use = rq->to_clean = rq->bufs[0];
62 rq->buf_index = 0;
63
64 return 0;
65}
66
67void vnic_rq_free(struct vnic_rq *rq)
68{
69 struct vnic_dev *vdev;
70 unsigned int i;
71
72 vdev = rq->vdev;
73
74 vnic_dev_free_desc_ring(vdev, &rq->ring);
75
76 for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {
77 kfree(rq->bufs[i]);
78 rq->bufs[i] = NULL;
79 }
80
81 rq->ctrl = NULL;
82}
83
84int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
85 unsigned int desc_count, unsigned int desc_size)
86{
87 int err;
88
89 rq->index = index;
90 rq->vdev = vdev;
91
92 rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);
93 if (!rq->ctrl) {
94 printk(KERN_ERR "Failed to hook RQ[%d] resource\n", index);
95 return -EINVAL;
96 }
97
98 vnic_rq_disable(rq);
99
100 err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size);
101 if (err)
102 return err;
103
104 err = vnic_rq_alloc_bufs(rq);
105 if (err) {
106 vnic_rq_free(rq);
107 return err;
108 }
109
110 return 0;
111}
112
113void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
114 unsigned int error_interrupt_enable,
115 unsigned int error_interrupt_offset)
116{
117 u64 paddr;
118 u32 fetch_index;
119
120 paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET;
121 writeq(paddr, &rq->ctrl->ring_base);
122 iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size);
123 iowrite32(cq_index, &rq->ctrl->cq_index);
124 iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
125 iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
126 iowrite32(0, &rq->ctrl->dropped_packet_count);
127 iowrite32(0, &rq->ctrl->error_status);
128
129 /* Use current fetch_index as the ring starting point */
130 fetch_index = ioread32(&rq->ctrl->fetch_index);
131 rq->to_use = rq->to_clean =
132 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
133 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
134 iowrite32(fetch_index, &rq->ctrl->posted_index);
135
136 rq->buf_index = 0;
137}
138
139unsigned int vnic_rq_error_status(struct vnic_rq *rq)
140{
141 return ioread32(&rq->ctrl->error_status);
142}
143
144void vnic_rq_enable(struct vnic_rq *rq)
145{
146 iowrite32(1, &rq->ctrl->enable);
147}
148
149int vnic_rq_disable(struct vnic_rq *rq)
150{
151 unsigned int wait;
152
153 iowrite32(0, &rq->ctrl->enable);
154
155 /* Wait for HW to ACK disable request */
156 for (wait = 0; wait < 100; wait++) {
157 if (!(ioread32(&rq->ctrl->running)))
158 return 0;
159 udelay(1);
160 }
161
162 printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index);
163
164 return -ETIMEDOUT;
165}
166
167void vnic_rq_clean(struct vnic_rq *rq,
168 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
169{
170 struct vnic_rq_buf *buf;
171 u32 fetch_index;
172
173 BUG_ON(ioread32(&rq->ctrl->enable));
174
175 buf = rq->to_clean;
176
177 while (vnic_rq_desc_used(rq) > 0) {
178
179 (*buf_clean)(rq, buf);
180
181 buf = rq->to_clean = buf->next;
182 rq->ring.desc_avail++;
183 }
184
185 /* Use current fetch_index as the ring starting point */
186 fetch_index = ioread32(&rq->ctrl->fetch_index);
187 rq->to_use = rq->to_clean =
188 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
189 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
190 iowrite32(fetch_index, &rq->ctrl->posted_index);
191
192 rq->buf_index = 0;
193
194 vnic_dev_clear_desc_ring(&rq->ring);
195}
196