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 | |
15 | static 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 | |
53 | void 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 | |
70 | int 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 | |
99 | void 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 | |
125 | unsigned int vnic_rq_error_status(struct vnic_rq *rq) |
126 | { |
127 | return ioread32(&rq->ctrl->error_status); |
128 | } |
129 | |
130 | void vnic_rq_enable(struct vnic_rq *rq) |
131 | { |
132 | iowrite32(1, &rq->ctrl->enable); |
133 | } |
134 | |
135 | int 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 | |
153 | void 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 | |