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_wq.h" |
16 | #include "enic.h" |
17 | |
18 | static int vnic_wq_alloc_bufs(struct vnic_wq *wq) |
19 | { |
20 | struct vnic_wq_buf *buf; |
21 | unsigned int i, j, count = wq->ring.desc_count; |
22 | unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count); |
23 | |
24 | for (i = 0; i < blks; i++) { |
25 | wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_KERNEL); |
26 | if (!wq->bufs[i]) |
27 | return -ENOMEM; |
28 | } |
29 | |
30 | for (i = 0; i < blks; i++) { |
31 | buf = wq->bufs[i]; |
32 | for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) { |
33 | buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j; |
34 | buf->desc = (u8 *)wq->ring.descs + |
35 | wq->ring.desc_size * buf->index; |
36 | if (buf->index + 1 == count) { |
37 | buf->next = wq->bufs[0]; |
38 | buf->next->prev = buf; |
39 | break; |
40 | } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) { |
41 | buf->next = wq->bufs[i + 1]; |
42 | buf->next->prev = buf; |
43 | } else { |
44 | buf->next = buf + 1; |
45 | buf->next->prev = buf; |
46 | buf++; |
47 | } |
48 | } |
49 | } |
50 | |
51 | wq->to_use = wq->to_clean = wq->bufs[0]; |
52 | |
53 | return 0; |
54 | } |
55 | |
56 | void vnic_wq_free(struct vnic_wq *wq) |
57 | { |
58 | struct vnic_dev *vdev; |
59 | unsigned int i; |
60 | |
61 | vdev = wq->vdev; |
62 | |
63 | vnic_dev_free_desc_ring(vdev, ring: &wq->ring); |
64 | |
65 | for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) { |
66 | if (wq->bufs[i]) { |
67 | kfree(objp: wq->bufs[i]); |
68 | wq->bufs[i] = NULL; |
69 | } |
70 | } |
71 | |
72 | wq->ctrl = NULL; |
73 | } |
74 | |
75 | int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index, |
76 | unsigned int desc_count, unsigned int desc_size) |
77 | { |
78 | int err; |
79 | |
80 | wq->index = index; |
81 | wq->vdev = vdev; |
82 | |
83 | wq->ctrl = vnic_dev_get_res(vdev, type: RES_TYPE_WQ, index); |
84 | if (!wq->ctrl) { |
85 | vdev_err(vdev, "Failed to hook WQ[%d] resource\n" , index); |
86 | return -EINVAL; |
87 | } |
88 | |
89 | vnic_wq_disable(wq); |
90 | |
91 | err = vnic_dev_alloc_desc_ring(vdev, ring: &wq->ring, desc_count, desc_size); |
92 | if (err) |
93 | return err; |
94 | |
95 | err = vnic_wq_alloc_bufs(wq); |
96 | if (err) { |
97 | vnic_wq_free(wq); |
98 | return err; |
99 | } |
100 | |
101 | return 0; |
102 | } |
103 | |
104 | int enic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, |
105 | unsigned int desc_count, unsigned int desc_size) |
106 | { |
107 | int err; |
108 | |
109 | wq->index = 0; |
110 | wq->vdev = vdev; |
111 | |
112 | wq->ctrl = vnic_dev_get_res(vdev, type: RES_TYPE_DEVCMD2, index: 0); |
113 | if (!wq->ctrl) |
114 | return -EINVAL; |
115 | vnic_wq_disable(wq); |
116 | err = vnic_dev_alloc_desc_ring(vdev, ring: &wq->ring, desc_count, desc_size); |
117 | |
118 | return err; |
119 | } |
120 | |
121 | void enic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index, |
122 | unsigned int fetch_index, unsigned int posted_index, |
123 | unsigned int error_interrupt_enable, |
124 | unsigned int error_interrupt_offset) |
125 | { |
126 | u64 paddr; |
127 | unsigned int count = wq->ring.desc_count; |
128 | |
129 | paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET; |
130 | writeq(val: paddr, addr: &wq->ctrl->ring_base); |
131 | iowrite32(count, &wq->ctrl->ring_size); |
132 | iowrite32(fetch_index, &wq->ctrl->fetch_index); |
133 | iowrite32(posted_index, &wq->ctrl->posted_index); |
134 | iowrite32(cq_index, &wq->ctrl->cq_index); |
135 | iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable); |
136 | iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset); |
137 | iowrite32(0, &wq->ctrl->error_status); |
138 | |
139 | wq->to_use = wq->to_clean = |
140 | &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)] |
141 | [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)]; |
142 | } |
143 | |
144 | void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, |
145 | unsigned int error_interrupt_enable, |
146 | unsigned int error_interrupt_offset) |
147 | { |
148 | enic_wq_init_start(wq, cq_index, fetch_index: 0, posted_index: 0, |
149 | error_interrupt_enable, |
150 | error_interrupt_offset); |
151 | } |
152 | |
153 | unsigned int vnic_wq_error_status(struct vnic_wq *wq) |
154 | { |
155 | return ioread32(&wq->ctrl->error_status); |
156 | } |
157 | |
158 | void vnic_wq_enable(struct vnic_wq *wq) |
159 | { |
160 | iowrite32(1, &wq->ctrl->enable); |
161 | } |
162 | |
163 | int vnic_wq_disable(struct vnic_wq *wq) |
164 | { |
165 | unsigned int wait; |
166 | struct vnic_dev *vdev = wq->vdev; |
167 | |
168 | iowrite32(0, &wq->ctrl->enable); |
169 | |
170 | /* Wait for HW to ACK disable request */ |
171 | for (wait = 0; wait < 1000; wait++) { |
172 | if (!(ioread32(&wq->ctrl->running))) |
173 | return 0; |
174 | udelay(10); |
175 | } |
176 | |
177 | vdev_neterr(vdev, "Failed to disable WQ[%d]\n" , wq->index); |
178 | |
179 | return -ETIMEDOUT; |
180 | } |
181 | |
182 | void vnic_wq_clean(struct vnic_wq *wq, |
183 | void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)) |
184 | { |
185 | struct vnic_wq_buf *buf; |
186 | |
187 | buf = wq->to_clean; |
188 | |
189 | while (vnic_wq_desc_used(wq) > 0) { |
190 | |
191 | (*buf_clean)(wq, buf); |
192 | |
193 | buf = wq->to_clean = buf->next; |
194 | wq->ring.desc_avail++; |
195 | } |
196 | |
197 | wq->to_use = wq->to_clean = wq->bufs[0]; |
198 | |
199 | iowrite32(0, &wq->ctrl->fetch_index); |
200 | iowrite32(0, &wq->ctrl->posted_index); |
201 | iowrite32(0, &wq->ctrl->error_status); |
202 | |
203 | vnic_dev_clear_desc_ring(ring: &wq->ring); |
204 | } |
205 | |