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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2008-2010 Cisco Systems, Inc. All rights reserved.
4 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
5 */
6
7#include <linux/kernel.h>
8#include <linux/errno.h>
9#include <linux/types.h>
10#include <linux/pci.h>
11#include <linux/delay.h>
12#include <linux/slab.h>
13
14#include "vnic_dev.h"
15#include "vnic_rq.h"
16#include "enic.h"
17
18static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
19{
20 struct vnic_rq_buf *buf;
21 unsigned int i, j, count = rq->ring.desc_count;
22 unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
23
24 for (i = 0; i < blks; i++) {
25 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ(count), GFP_KERNEL);
26 if (!rq->bufs[i])
27 return -ENOMEM;
28 }
29
30 for (i = 0; i < blks; i++) {
31 buf = rq->bufs[i];
32 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES(count); j++) {
33 buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES(count) + j;
34 buf->desc = (u8 *)rq->ring.descs +
35 rq->ring.desc_size * buf->index;
36 if (buf->index + 1 == count) {
37 buf->next = rq->bufs[0];
38 break;
39 } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES(count)) {
40 buf->next = rq->bufs[i + 1];
41 } else {
42 buf->next = buf + 1;
43 buf++;
44 }
45 }
46 }
47
48 rq->to_use = rq->to_clean = rq->bufs[0];
49
50 return 0;
51}
52
53void vnic_rq_free(struct vnic_rq *rq)
54{
55 struct vnic_dev *vdev;
56 unsigned int i;
57
58 vdev = rq->vdev;
59
60 vnic_dev_free_desc_ring(vdev, &rq->ring);
61
62 for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {
63 if (rq->bufs[i]) {
64 kfree(rq->bufs[i]);
65 rq->bufs[i] = NULL;
66 }
67 }
68
69 rq->ctrl = NULL;
70}
71
72int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
73 unsigned int desc_count, unsigned int desc_size)
74{
75 int err;
76
77 rq->index = index;
78 rq->vdev = vdev;
79
80 rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);
81 if (!rq->ctrl) {
82 vdev_err(vdev, "Failed to hook RQ[%d] resource\n", index);
83 return -EINVAL;
84 }
85
86 vnic_rq_disable(rq);
87
88 err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size);
89 if (err)
90 return err;
91
92 err = vnic_rq_alloc_bufs(rq);
93 if (err) {
94 vnic_rq_free(rq);
95 return err;
96 }
97
98 return 0;
99}
100
101static void vnic_rq_init_start(struct vnic_rq *rq, unsigned int cq_index,
102 unsigned int fetch_index, unsigned int posted_index,
103 unsigned int error_interrupt_enable,
104 unsigned int error_interrupt_offset)
105{
106 u64 paddr;
107 unsigned int count = rq->ring.desc_count;
108
109 paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET;
110 writeq(paddr, &rq->ctrl->ring_base);
111 iowrite32(count, &rq->ctrl->ring_size);
112 iowrite32(cq_index, &rq->ctrl->cq_index);
113 iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
114 iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
115 iowrite32(0, &rq->ctrl->dropped_packet_count);
116 iowrite32(0, &rq->ctrl->error_status);
117 iowrite32(fetch_index, &rq->ctrl->fetch_index);
118 iowrite32(posted_index, &rq->ctrl->posted_index);
119
120 rq->to_use = rq->to_clean =
121 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
122 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
123}
124
125void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
126 unsigned int error_interrupt_enable,
127 unsigned int error_interrupt_offset)
128{
129 vnic_rq_init_start(rq, cq_index, 0, 0, error_interrupt_enable,
130 error_interrupt_offset);
131}
132
133unsigned int vnic_rq_error_status(struct vnic_rq *rq)
134{
135 return ioread32(&rq->ctrl->error_status);
136}
137
138void vnic_rq_enable(struct vnic_rq *rq)
139{
140 iowrite32(1, &rq->ctrl->enable);
141}
142
143int vnic_rq_disable(struct vnic_rq *rq)
144{
145 unsigned int wait;
146 struct vnic_dev *vdev = rq->vdev;
147 int i;
148
149 /* Due to a race condition with clearing RQ "mini-cache" in hw, we need
150 * to disable the RQ twice to guarantee that stale descriptors are not
151 * used when this RQ is re-enabled.
152 */
153 for (i = 0; i < 2; i++) {
154 iowrite32(0, &rq->ctrl->enable);
155
156 /* Wait for HW to ACK disable request */
157 for (wait = 20000; wait > 0; wait--)
158 if (!ioread32(&rq->ctrl->running))
159 break;
160 if (!wait) {
161 vdev_neterr(vdev, "Failed to disable RQ[%d]\n",
162 rq->index);
163
164 return -ETIMEDOUT;
165 }
166 }
167
168 return 0;
169}
170
171void vnic_rq_clean(struct vnic_rq *rq,
172 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
173{
174 struct vnic_rq_buf *buf;
175 u32 fetch_index;
176 unsigned int count = rq->ring.desc_count;
177 int i;
178
179 buf = rq->to_clean;
180
181 for (i = 0; i < rq->ring.desc_count; i++) {
182 (*buf_clean)(rq, buf);
183 buf = buf->next;
184 }
185 rq->ring.desc_avail = rq->ring.desc_count - 1;
186
187 /* Use current fetch_index as the ring starting point */
188 fetch_index = ioread32(&rq->ctrl->fetch_index);
189
190 if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */
191 /* Hardware surprise removal: reset fetch_index */
192 fetch_index = 0;
193 }
194 rq->to_use = rq->to_clean =
195 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
196 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
197 iowrite32(fetch_index, &rq->ctrl->posted_index);
198
199 /* Anytime we write fetch_index, we need to re-write 0 to rq->enable
200 * to re-sync internal VIC state.
201 */
202 iowrite32(0, &rq->ctrl->enable);
203
204 vnic_dev_clear_desc_ring(&rq->ring);
205}
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#include "enic.h"
30
31static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
32{
33 struct vnic_rq_buf *buf;
34 unsigned int i, j, count = rq->ring.desc_count;
35 unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
36
37 for (i = 0; i < blks; i++) {
38 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ(count), GFP_KERNEL);
39 if (!rq->bufs[i])
40 return -ENOMEM;
41 }
42
43 for (i = 0; i < blks; i++) {
44 buf = rq->bufs[i];
45 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES(count); j++) {
46 buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES(count) + 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(count)) {
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
63 return 0;
64}
65
66void vnic_rq_free(struct vnic_rq *rq)
67{
68 struct vnic_dev *vdev;
69 unsigned int i;
70
71 vdev = rq->vdev;
72
73 vnic_dev_free_desc_ring(vdev, &rq->ring);
74
75 for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {
76 if (rq->bufs[i]) {
77 kfree(rq->bufs[i]);
78 rq->bufs[i] = NULL;
79 }
80 }
81
82 rq->ctrl = NULL;
83}
84
85int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
86 unsigned int desc_count, unsigned int desc_size)
87{
88 int err;
89
90 rq->index = index;
91 rq->vdev = vdev;
92
93 rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);
94 if (!rq->ctrl) {
95 vdev_err(vdev, "Failed to hook RQ[%d] resource\n", index);
96 return -EINVAL;
97 }
98
99 vnic_rq_disable(rq);
100
101 err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size);
102 if (err)
103 return err;
104
105 err = vnic_rq_alloc_bufs(rq);
106 if (err) {
107 vnic_rq_free(rq);
108 return err;
109 }
110
111 return 0;
112}
113
114static void vnic_rq_init_start(struct vnic_rq *rq, unsigned int cq_index,
115 unsigned int fetch_index, unsigned int posted_index,
116 unsigned int error_interrupt_enable,
117 unsigned int error_interrupt_offset)
118{
119 u64 paddr;
120 unsigned int count = rq->ring.desc_count;
121
122 paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET;
123 writeq(paddr, &rq->ctrl->ring_base);
124 iowrite32(count, &rq->ctrl->ring_size);
125 iowrite32(cq_index, &rq->ctrl->cq_index);
126 iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
127 iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
128 iowrite32(0, &rq->ctrl->dropped_packet_count);
129 iowrite32(0, &rq->ctrl->error_status);
130 iowrite32(fetch_index, &rq->ctrl->fetch_index);
131 iowrite32(posted_index, &rq->ctrl->posted_index);
132
133 rq->to_use = rq->to_clean =
134 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
135 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
136}
137
138void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
139 unsigned int error_interrupt_enable,
140 unsigned int error_interrupt_offset)
141{
142 vnic_rq_init_start(rq, cq_index, 0, 0, error_interrupt_enable,
143 error_interrupt_offset);
144}
145
146unsigned int vnic_rq_error_status(struct vnic_rq *rq)
147{
148 return ioread32(&rq->ctrl->error_status);
149}
150
151void vnic_rq_enable(struct vnic_rq *rq)
152{
153 iowrite32(1, &rq->ctrl->enable);
154}
155
156int vnic_rq_disable(struct vnic_rq *rq)
157{
158 unsigned int wait;
159 struct vnic_dev *vdev = rq->vdev;
160 int i;
161
162 /* Due to a race condition with clearing RQ "mini-cache" in hw, we need
163 * to disable the RQ twice to guarantee that stale descriptors are not
164 * used when this RQ is re-enabled.
165 */
166 for (i = 0; i < 2; i++) {
167 iowrite32(0, &rq->ctrl->enable);
168
169 /* Wait for HW to ACK disable request */
170 for (wait = 20000; wait > 0; wait--)
171 if (!ioread32(&rq->ctrl->running))
172 break;
173 if (!wait) {
174 vdev_neterr(vdev, "Failed to disable RQ[%d]\n",
175 rq->index);
176
177 return -ETIMEDOUT;
178 }
179 }
180
181 return 0;
182}
183
184void vnic_rq_clean(struct vnic_rq *rq,
185 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
186{
187 struct vnic_rq_buf *buf;
188 u32 fetch_index;
189 unsigned int count = rq->ring.desc_count;
190 int i;
191
192 buf = rq->to_clean;
193
194 for (i = 0; i < rq->ring.desc_count; i++) {
195 (*buf_clean)(rq, buf);
196 buf = buf->next;
197 }
198 rq->ring.desc_avail = rq->ring.desc_count - 1;
199
200 /* Use current fetch_index as the ring starting point */
201 fetch_index = ioread32(&rq->ctrl->fetch_index);
202
203 if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */
204 /* Hardware surprise removal: reset fetch_index */
205 fetch_index = 0;
206 }
207 rq->to_use = rq->to_clean =
208 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
209 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
210 iowrite32(fetch_index, &rq->ctrl->posted_index);
211
212 /* Anytime we write fetch_index, we need to re-write 0 to rq->enable
213 * to re-sync internal VIC state.
214 */
215 iowrite32(0, &rq->ctrl->enable);
216
217 vnic_dev_clear_desc_ring(&rq->ring);
218}
219