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_rq.h"
29
vnic_rq_alloc_bufs(struct vnic_rq * rq)30 static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
31 {
32 struct vnic_rq_buf *buf;
33 unsigned int i, j, count = rq->ring.desc_count;
34 unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
35
36 for (i = 0; i < blks; i++) {
37 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ(count), GFP_ATOMIC);
38 if (!rq->bufs[i])
39 return -ENOMEM;
40 }
41
42 for (i = 0; i < blks; i++) {
43 buf = rq->bufs[i];
44 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES(count); j++) {
45 buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES(count) + j;
46 buf->desc = (u8 *)rq->ring.descs +
47 rq->ring.desc_size * buf->index;
48 if (buf->index + 1 == count) {
49 buf->next = rq->bufs[0];
50 break;
51 } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES(count)) {
52 buf->next = rq->bufs[i + 1];
53 } else {
54 buf->next = buf + 1;
55 buf++;
56 }
57 }
58 }
59
60 rq->to_use = rq->to_clean = rq->bufs[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 if (rq->bufs[i]) {
76 kfree(rq->bufs[i]);
77 rq->bufs[i] = NULL;
78 }
79 }
80
81 rq->ctrl = NULL;
82 }
83
vnic_rq_alloc(struct vnic_dev * vdev,struct vnic_rq * rq,unsigned int index,unsigned int desc_count,unsigned int desc_size)84 int 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 pr_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
vnic_rq_init_start(struct vnic_rq * rq,unsigned int cq_index,unsigned int fetch_index,unsigned int posted_index,unsigned int error_interrupt_enable,unsigned int error_interrupt_offset)113 static void vnic_rq_init_start(struct vnic_rq *rq, unsigned int cq_index,
114 unsigned int fetch_index, unsigned int posted_index,
115 unsigned int error_interrupt_enable,
116 unsigned int error_interrupt_offset)
117 {
118 u64 paddr;
119 unsigned int count = rq->ring.desc_count;
120
121 paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET;
122 writeq(paddr, &rq->ctrl->ring_base);
123 iowrite32(count, &rq->ctrl->ring_size);
124 iowrite32(cq_index, &rq->ctrl->cq_index);
125 iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
126 iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
127 iowrite32(0, &rq->ctrl->dropped_packet_count);
128 iowrite32(0, &rq->ctrl->error_status);
129 iowrite32(fetch_index, &rq->ctrl->fetch_index);
130 iowrite32(posted_index, &rq->ctrl->posted_index);
131
132 rq->to_use = rq->to_clean =
133 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
134 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
135 }
136
vnic_rq_init(struct vnic_rq * rq,unsigned int cq_index,unsigned int error_interrupt_enable,unsigned int error_interrupt_offset)137 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
138 unsigned int error_interrupt_enable,
139 unsigned int error_interrupt_offset)
140 {
141 u32 fetch_index = 0;
142
143 /* Use current fetch_index as the ring starting point */
144 fetch_index = ioread32(&rq->ctrl->fetch_index);
145
146 if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */
147 /* Hardware surprise removal: reset fetch_index */
148 fetch_index = 0;
149 }
150
151 vnic_rq_init_start(rq, cq_index,
152 fetch_index, fetch_index,
153 error_interrupt_enable,
154 error_interrupt_offset);
155 }
156
vnic_rq_error_status(struct vnic_rq * rq)157 unsigned int vnic_rq_error_status(struct vnic_rq *rq)
158 {
159 return ioread32(&rq->ctrl->error_status);
160 }
161
vnic_rq_enable(struct vnic_rq * rq)162 void vnic_rq_enable(struct vnic_rq *rq)
163 {
164 iowrite32(1, &rq->ctrl->enable);
165 }
166
vnic_rq_disable(struct vnic_rq * rq)167 int vnic_rq_disable(struct vnic_rq *rq)
168 {
169 unsigned int wait;
170
171 iowrite32(0, &rq->ctrl->enable);
172
173 /* Wait for HW to ACK disable request */
174 for (wait = 0; wait < 1000; wait++) {
175 if (!(ioread32(&rq->ctrl->running)))
176 return 0;
177 udelay(10);
178 }
179
180 pr_err("Failed to disable RQ[%d]\n", rq->index);
181
182 return -ETIMEDOUT;
183 }
184
vnic_rq_clean(struct vnic_rq * rq,void (* buf_clean)(struct vnic_rq * rq,struct vnic_rq_buf * buf))185 void vnic_rq_clean(struct vnic_rq *rq,
186 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
187 {
188 struct vnic_rq_buf *buf;
189 u32 fetch_index;
190 unsigned int count = rq->ring.desc_count;
191
192 buf = rq->to_clean;
193
194 while (vnic_rq_desc_used(rq) > 0) {
195
196 (*buf_clean)(rq, buf);
197
198 buf = rq->to_clean = buf->next;
199 rq->ring.desc_avail++;
200 }
201
202 /* Use current fetch_index as the ring starting point */
203 fetch_index = ioread32(&rq->ctrl->fetch_index);
204
205 if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */
206 /* Hardware surprise removal: reset fetch_index */
207 fetch_index = 0;
208 }
209 rq->to_use = rq->to_clean =
210 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
211 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
212 iowrite32(fetch_index, &rq->ctrl->posted_index);
213
214 vnic_dev_clear_desc_ring(&rq->ring);
215 }
216
217