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
18static 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
56void 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, &wq->ring);
64
65	for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
66		if (wq->bufs[i]) {
67			kfree(wq->bufs[i]);
68			wq->bufs[i] = NULL;
69		}
70	}
71
72	wq->ctrl = NULL;
73}
74
75int 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, 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, &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
104int 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, RES_TYPE_DEVCMD2, 0);
113	if (!wq->ctrl)
114		return -EINVAL;
115	vnic_wq_disable(wq);
116	err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
117
118	return err;
119}
120
121void 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(paddr, &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
144void 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, 0, 0,
149		error_interrupt_enable,
150		error_interrupt_offset);
151}
152
153unsigned int vnic_wq_error_status(struct vnic_wq *wq)
154{
155	return ioread32(&wq->ctrl->error_status);
156}
157
158void vnic_wq_enable(struct vnic_wq *wq)
159{
160	iowrite32(1, &wq->ctrl->enable);
161}
162
163int 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
182void 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(&wq->ring);
204}
205