1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2008 Cisco Systems, Inc. All rights reserved.
4 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
5 */
6
7#include <linux/errno.h>
8#include <linux/types.h>
9#include <linux/pci.h>
10#include <linux/delay.h>
11#include <linux/slab.h>
12#include "vnic_dev.h"
13#include "vnic_rq.h"
14
15static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
16{
17 struct vnic_rq_buf *buf;
18 unsigned int i, j, count = rq->ring.desc_count;
19 unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
20
21 for (i = 0; i < blks; i++) {
22 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC);
23 if (!rq->bufs[i]) {
24 printk(KERN_ERR "Failed to alloc rq_bufs\n");
25 return -ENOMEM;
26 }
27 }
28
29 for (i = 0; i < blks; i++) {
30 buf = rq->bufs[i];
31 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) {
32 buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j;
33 buf->desc = (u8 *)rq->ring.descs +
34 rq->ring.desc_size * buf->index;
35 if (buf->index + 1 == count) {
36 buf->next = rq->bufs[0];
37 break;
38 } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) {
39 buf->next = rq->bufs[i + 1];
40 } else {
41 buf->next = buf + 1;
42 buf++;
43 }
44 }
45 }
46
47 rq->to_use = rq->to_clean = rq->bufs[0];
48 rq->buf_index = 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, ring: &rq->ring);
61
62 for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {
63 kfree(objp: rq->bufs[i]);
64 rq->bufs[i] = NULL;
65 }
66
67 rq->ctrl = NULL;
68}
69
70int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
71 unsigned int desc_count, unsigned int desc_size)
72{
73 int err;
74
75 rq->index = index;
76 rq->vdev = vdev;
77
78 rq->ctrl = vnic_dev_get_res(vdev, type: RES_TYPE_RQ, index);
79 if (!rq->ctrl) {
80 printk(KERN_ERR "Failed to hook RQ[%d] resource\n", index);
81 return -EINVAL;
82 }
83
84 vnic_rq_disable(rq);
85
86 err = vnic_dev_alloc_desc_ring(vdev, ring: &rq->ring, desc_count, desc_size);
87 if (err)
88 return err;
89
90 err = vnic_rq_alloc_bufs(rq);
91 if (err) {
92 vnic_rq_free(rq);
93 return err;
94 }
95
96 return 0;
97}
98
99void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
100 unsigned int error_interrupt_enable,
101 unsigned int error_interrupt_offset)
102{
103 u64 paddr;
104 u32 fetch_index;
105
106 paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET;
107 writeq(val: paddr, addr: &rq->ctrl->ring_base);
108 iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size);
109 iowrite32(cq_index, &rq->ctrl->cq_index);
110 iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
111 iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
112 iowrite32(0, &rq->ctrl->dropped_packet_count);
113 iowrite32(0, &rq->ctrl->error_status);
114
115 /* Use current fetch_index as the ring starting point */
116 fetch_index = ioread32(&rq->ctrl->fetch_index);
117 rq->to_use = rq->to_clean =
118 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
119 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
120 iowrite32(fetch_index, &rq->ctrl->posted_index);
121
122 rq->buf_index = 0;
123}
124
125unsigned int vnic_rq_error_status(struct vnic_rq *rq)
126{
127 return ioread32(&rq->ctrl->error_status);
128}
129
130void vnic_rq_enable(struct vnic_rq *rq)
131{
132 iowrite32(1, &rq->ctrl->enable);
133}
134
135int vnic_rq_disable(struct vnic_rq *rq)
136{
137 unsigned int wait;
138
139 iowrite32(0, &rq->ctrl->enable);
140
141 /* Wait for HW to ACK disable request */
142 for (wait = 0; wait < 100; wait++) {
143 if (!(ioread32(&rq->ctrl->running)))
144 return 0;
145 udelay(1);
146 }
147
148 printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index);
149
150 return -ETIMEDOUT;
151}
152
153void vnic_rq_clean(struct vnic_rq *rq,
154 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
155{
156 struct vnic_rq_buf *buf;
157 u32 fetch_index;
158
159 WARN_ON(ioread32(&rq->ctrl->enable));
160
161 buf = rq->to_clean;
162
163 while (vnic_rq_desc_used(rq) > 0) {
164
165 (*buf_clean)(rq, buf);
166
167 buf = rq->to_clean = buf->next;
168 rq->ring.desc_avail++;
169 }
170
171 /* Use current fetch_index as the ring starting point */
172 fetch_index = ioread32(&rq->ctrl->fetch_index);
173 rq->to_use = rq->to_clean =
174 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
175 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
176 iowrite32(fetch_index, &rq->ctrl->posted_index);
177
178 rq->buf_index = 0;
179
180 vnic_dev_clear_desc_ring(ring: &rq->ring);
181}
182

source code of linux/drivers/scsi/fnic/vnic_rq.c