[net-next-2.6.git] / drivers / net / enic / vnic_wq.c

/*
 * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/delay.h>

#include "vnic_dev.h"
#include "vnic_wq.h"

static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
{
	struct vnic_wq_buf *buf;
	struct vnic_dev *vdev;
	unsigned int i, j, count = wq->ring.desc_count;
	unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);

	vdev = wq->vdev;

	for (i = 0; i < blks; i++) {
		wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
		if (!wq->bufs[i]) {
			printk(KERN_ERR "Failed to alloc wq_bufs\n");
			return -ENOMEM;
		}
	}

	for (i = 0; i < blks; i++) {
		buf = wq->bufs[i];
		for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) {
			buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j;
			buf->desc = (u8 *)wq->ring.descs +
				wq->ring.desc_size * buf->index;
			if (buf->index + 1 == count) {
				buf->next = wq->bufs[0];
				break;
			} else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) {
				buf->next = wq->bufs[i + 1];
			} else {
				buf->next = buf + 1;
				buf++;
			}
		}
	}

	wq->to_use = wq->to_clean = wq->bufs[0];

	return 0;
}

void vnic_wq_free(struct vnic_wq *wq)
{
	struct vnic_dev *vdev;
	unsigned int i;

	vdev = wq->vdev;

	vnic_dev_free_desc_ring(vdev, &wq->ring);

	for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
		kfree(wq->bufs[i]);
		wq->bufs[i] = NULL;
	}

	wq->ctrl = NULL;
}

int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
	unsigned int desc_count, unsigned int desc_size)
{
	int err;

	wq->index = index;
	wq->vdev = vdev;

	wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
	if (!wq->ctrl) {
		printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index);
		return -EINVAL;
	}

	vnic_wq_disable(wq);

	err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
	if (err)
		return err;

	err = vnic_wq_alloc_bufs(wq);
	if (err) {
		vnic_wq_free(wq);
		return err;
	}

	return 0;
}

void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
	unsigned int fetch_index, unsigned int posted_index,
	unsigned int error_interrupt_enable,
	unsigned int error_interrupt_offset)
{
	u64 paddr;

	paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
	writeq(paddr, &wq->ctrl->ring_base);
	iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
	iowrite32(fetch_index, &wq->ctrl->fetch_index);
	iowrite32(posted_index, &wq->ctrl->posted_index);
	iowrite32(cq_index, &wq->ctrl->cq_index);
	iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
	iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
	iowrite32(0, &wq->ctrl->error_status);

	wq->to_use = wq->to_clean =
		&wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES]
			[fetch_index % VNIC_WQ_BUF_BLK_ENTRIES];
}

void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
	unsigned int error_interrupt_enable,
	unsigned int error_interrupt_offset)
{
	vnic_wq_init_start(wq, cq_index, 0, 0,
		error_interrupt_enable,
		error_interrupt_offset);
}

unsigned int vnic_wq_error_status(struct vnic_wq *wq)
{
	return ioread32(&wq->ctrl->error_status);
}

void vnic_wq_enable(struct vnic_wq *wq)
{
	iowrite32(1, &wq->ctrl->enable);
}

int vnic_wq_disable(struct vnic_wq *wq)
{
	unsigned int wait;

	iowrite32(0, &wq->ctrl->enable);

	/* Wait for HW to ACK disable request */
	for (wait = 0; wait < 1000; wait++) {
		if (!(ioread32(&wq->ctrl->running)))
			return 0;
		udelay(10);
	}

	printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index);

	return -ETIMEDOUT;
}

void vnic_wq_clean(struct vnic_wq *wq,
	void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
{
	struct vnic_wq_buf *buf;

	BUG_ON(ioread32(&wq->ctrl->enable));

	buf = wq->to_clean;

	while (vnic_wq_desc_used(wq) > 0) {

		(*buf_clean)(wq, buf);

		buf = wq->to_clean = buf->next;
		wq->ring.desc_avail++;
	}

	wq->to_use = wq->to_clean = wq->bufs[0];

	iowrite32(0, &wq->ctrl->fetch_index);
	iowrite32(0, &wq->ctrl->posted_index);
	iowrite32(0, &wq->ctrl->error_status);

	vnic_dev_clear_desc_ring(&wq->ring);
}
Commit	Line	Data
01f2e4ea SF	1	/*
	2	* Copyright 2008 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
	26	#include "vnic_dev.h"
	27	#include "vnic_wq.h"
	28
	29	static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
	30	{
	31	struct vnic_wq_buf *buf;
	32	struct vnic_dev *vdev;
	33	unsigned int i, j, count = wq->ring.desc_count;
	34	unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
	35
	36	vdev = wq->vdev;
	37
	38	for (i = 0; i < blks; i++) {
	39	wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
	40	if (!wq->bufs[i]) {
	41	printk(KERN_ERR "Failed to alloc wq_bufs\n");
	42	return -ENOMEM;
	43	}
	44	}
	45
	46	for (i = 0; i < blks; i++) {
	47	buf = wq->bufs[i];
	48	for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) {
	49	buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j;
	50	buf->desc = (u8 *)wq->ring.descs +
	51	wq->ring.desc_size * buf->index;
	52	if (buf->index + 1 == count) {
	53	buf->next = wq->bufs[0];
	54	break;
	55	} else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) {
	56	buf->next = wq->bufs[i + 1];
	57	} else {
	58	buf->next = buf + 1;
	59	buf++;
	60	}
	61	}
	62	}
	63
	64	wq->to_use = wq->to_clean = wq->bufs[0];
65
66	return 0;
67	}
68
69	void 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	kfree(wq->bufs[i]);
80	wq->bufs[i] = NULL;
81	}
82
83	wq->ctrl = NULL;
84	}
85
86	int vnic_wq_alloc(struct vnic_dev vdev, struct vnic_wq wq, unsigned int index,
87	unsigned int desc_count, unsigned int desc_size)
88	{
89	int err;
90
91	wq->index = index;
92	wq->vdev = vdev;
93
94	wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
95	if (!wq->ctrl) {
96	printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index);
97	return -EINVAL;
98	}
99
100	vnic_wq_disable(wq);
101
102	err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
103	if (err)
104	return err;
105
106	err = vnic_wq_alloc_bufs(wq);
107	if (err) {
108	vnic_wq_free(wq);
109	return err;
110	}
111
112	return 0;
113	}
114
6fdfa970 SF	115	void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
6fdfa970 SF	116	unsigned int fetch_index, unsigned int posted_index,
01f2e4ea SF	117	unsigned int error_interrupt_enable,
	118	unsigned int error_interrupt_offset)
	119	{
	120	u64 paddr;
	121
	122	paddr = (u64)wq->ring.base_addr \| VNIC_PADDR_TARGET;
	123	writeq(paddr, &wq->ctrl->ring_base);
	124	iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
6fdfa970 SF	125	iowrite32(fetch_index, &wq->ctrl->fetch_index);
6fdfa970 SF	126	iowrite32(posted_index, &wq->ctrl->posted_index);
01f2e4ea SF	127	iowrite32(cq_index, &wq->ctrl->cq_index);
	128	iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
	129	iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
	130	iowrite32(0, &wq->ctrl->error_status);
6fdfa970 SF	131
	132	wq->to_use = wq->to_clean =
	133	&wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES]
	134	[fetch_index % VNIC_WQ_BUF_BLK_ENTRIES];
	135	}
	136
	137	void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
	138	unsigned int error_interrupt_enable,
	139	unsigned int error_interrupt_offset)
	140	{
	141	vnic_wq_init_start(wq, cq_index, 0, 0,
	142	error_interrupt_enable,
	143	error_interrupt_offset);
01f2e4ea SF	144	}
	145
	146	unsigned int vnic_wq_error_status(struct vnic_wq *wq)
	147	{
	148	return ioread32(&wq->ctrl->error_status);
	149	}
	150
	151	void vnic_wq_enable(struct vnic_wq *wq)
	152	{
	153	iowrite32(1, &wq->ctrl->enable);
	154	}
	155
	156	int vnic_wq_disable(struct vnic_wq *wq)
	157	{
	158	unsigned int wait;
	159
	160	iowrite32(0, &wq->ctrl->enable);
	161
	162	/* Wait for HW to ACK disable request */
b6d24eb6	163	for (wait = 0; wait < 1000; wait++) {
01f2e4ea SF	164	if (!(ioread32(&wq->ctrl->running)))
01f2e4ea SF	165	return 0;
b6d24eb6	166	udelay(10);
01f2e4ea SF	167	}
	168
	169	printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index);
	170
	171	return -ETIMEDOUT;
	172	}
	173
	174	void vnic_wq_clean(struct vnic_wq *wq,
	175	void (buf_clean)(struct vnic_wq wq, struct vnic_wq_buf *buf))
	176	{
	177	struct vnic_wq_buf *buf;
	178
	179	BUG_ON(ioread32(&wq->ctrl->enable));
	180
	181	buf = wq->to_clean;
	182
	183	while (vnic_wq_desc_used(wq) > 0) {
	184
	185	(*buf_clean)(wq, buf);
	186
	187	buf = wq->to_clean = buf->next;
	188	wq->ring.desc_avail++;
	189	}
	190
	191	wq->to_use = wq->to_clean = wq->bufs[0];
	192
	193	iowrite32(0, &wq->ctrl->fetch_index);
	194	iowrite32(0, &wq->ctrl->posted_index);
	195	iowrite32(0, &wq->ctrl->error_status);
	196
	197	vnic_dev_clear_desc_ring(&wq->ring);
	198	}