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_wq.h"
29#include "enic.h"
30
31static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
32{
33	struct vnic_wq_buf *buf;
34	unsigned int i, j, count = wq->ring.desc_count;
35	unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
36
37	for (i = 0; i < blks; i++) {
38		wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_ATOMIC);
39		if (!wq->bufs[i])
40			return -ENOMEM;
41	}
42
43	for (i = 0; i < blks; i++) {
44		buf = wq->bufs[i];
45		for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) {
46			buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j;
47			buf->desc = (u8 *)wq->ring.descs +
48				wq->ring.desc_size * buf->index;
49			if (buf->index + 1 == count) {
50				buf->next = wq->bufs[0];
51				buf->next->prev = buf;
52				break;
53			} else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {
54				buf->next = wq->bufs[i + 1];
55				buf->next->prev = buf;
56			} else {
57				buf->next = buf + 1;
58				buf->next->prev = buf;
59				buf++;
60			}
61		}
62	}
63
64	wq->to_use = wq->to_clean = wq->bufs[0];
65
66	return 0;
67}
68
69void vnic_wq_free(struct vnic_wq *wq)
70{
71	struct vnic_dev *vdev;
72	unsigned int i;
73
74	vdev = wq->vdev;
75
76	vnic_dev_free_desc_ring(vdev, &wq->ring);
77
78	for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
79		if (wq->bufs[i]) {
80			kfree(wq->bufs[i]);
81			wq->bufs[i] = NULL;
82		}
83	}
84
85	wq->ctrl = NULL;
86}
87
88int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
89	unsigned int desc_count, unsigned int desc_size)
90{
91	int err;
92
93	wq->index = index;
94	wq->vdev = vdev;
95
96	wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
97	if (!wq->ctrl) {
98		vdev_err("Failed to hook WQ[%d] resource\n", index);
99		return -EINVAL;
100	}
101
102	vnic_wq_disable(wq);
103
104	err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
105	if (err)
106		return err;
107
108	err = vnic_wq_alloc_bufs(wq);
109	if (err) {
110		vnic_wq_free(wq);
111		return err;
112	}
113
114	return 0;
115}
116
117int enic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
118			  unsigned int desc_count, unsigned int desc_size)
119{
120	int err;
121
122	wq->index = 0;
123	wq->vdev = vdev;
124
125	wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
126	if (!wq->ctrl)
127		return -EINVAL;
128	vnic_wq_disable(wq);
129	err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
130
131	return err;
132}
133
134void enic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
135			unsigned int fetch_index, unsigned int posted_index,
136			unsigned int error_interrupt_enable,
137			unsigned int error_interrupt_offset)
138{
139	u64 paddr;
140	unsigned int count = wq->ring.desc_count;
141
142	paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
143	writeq(paddr, &wq->ctrl->ring_base);
144	iowrite32(count, &wq->ctrl->ring_size);
145	iowrite32(fetch_index, &wq->ctrl->fetch_index);
146	iowrite32(posted_index, &wq->ctrl->posted_index);
147	iowrite32(cq_index, &wq->ctrl->cq_index);
148	iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
149	iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
150	iowrite32(0, &wq->ctrl->error_status);
151
152	wq->to_use = wq->to_clean =
153		&wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
154			[fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
155}
156
157void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
158	unsigned int error_interrupt_enable,
159	unsigned int error_interrupt_offset)
160{
161	enic_wq_init_start(wq, cq_index, 0, 0,
162		error_interrupt_enable,
163		error_interrupt_offset);
164}
165
166unsigned int vnic_wq_error_status(struct vnic_wq *wq)
167{
168	return ioread32(&wq->ctrl->error_status);
169}
170
171void vnic_wq_enable(struct vnic_wq *wq)
172{
173	iowrite32(1, &wq->ctrl->enable);
174}
175
176int vnic_wq_disable(struct vnic_wq *wq)
177{
178	unsigned int wait;
179	struct vnic_dev *vdev = wq->vdev;
180
181	iowrite32(0, &wq->ctrl->enable);
182
183	/* Wait for HW to ACK disable request */
184	for (wait = 0; wait < 1000; wait++) {
185		if (!(ioread32(&wq->ctrl->running)))
186			return 0;
187		udelay(10);
188	}
189
190	vdev_neterr("Failed to disable WQ[%d]\n", wq->index);
191
192	return -ETIMEDOUT;
193}
194
195void vnic_wq_clean(struct vnic_wq *wq,
196	void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
197{
198	struct vnic_wq_buf *buf;
199
200	buf = wq->to_clean;
201
202	while (vnic_wq_desc_used(wq) > 0) {
203
204		(*buf_clean)(wq, buf);
205
206		buf = wq->to_clean = buf->next;
207		wq->ring.desc_avail++;
208	}
209
210	wq->to_use = wq->to_clean = wq->bufs[0];
211
212	iowrite32(0, &wq->ctrl->fetch_index);
213	iowrite32(0, &wq->ctrl->posted_index);
214	iowrite32(0, &wq->ctrl->error_status);
215
216	vnic_dev_clear_desc_ring(&wq->ring);
217}
218