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

/*
 * Copyright 2008-2010 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 <linux/slab.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(count), GFP_ATOMIC);
		if (!wq->bufs[i]) {
			pr_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(count); j++) {
			buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + 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(count)) {
				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) {
		pr_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;
	unsigned int count = wq->ring.desc_count;

	paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
	writeq(paddr, &wq->ctrl->ring_base);
	iowrite32(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(count)]
			[fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
}

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);
	}

	pr_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;

	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	1	/*
29046f9b	2	* Copyright 2008-2010 Cisco Systems, Inc. All rights reserved.
01f2e4ea SF	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>
5a0e3ad6	25	#include <linux/slab.h>
01f2e4ea SF	26
	27	#include "vnic_dev.h"
	28	#include "vnic_wq.h"
	29
	30	static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
	31	{
	32	struct vnic_wq_buf *buf;
	33	struct vnic_dev *vdev;
	34	unsigned int i, j, count = wq->ring.desc_count;
	35	unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
	36
	37	vdev = wq->vdev;
	38
	39	for (i = 0; i < blks; i++) {
b5bab85c	40	wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_ATOMIC);
01f2e4ea	41	if (!wq->bufs[i]) {
a7a79deb	42	pr_err("Failed to alloc wq_bufs\n");
01f2e4ea SF	43	return -ENOMEM;
	44	}
	45	}
	46
	47	for (i = 0; i < blks; i++) {
	48	buf = wq->bufs[i];
b5bab85c VK	49	for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) {
b5bab85c VK	50	buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j;
01f2e4ea SF	51	buf->desc = (u8 *)wq->ring.descs +
	52	wq->ring.desc_size * buf->index;
	53	if (buf->index + 1 == count) {
	54	buf->next = wq->bufs[0];
	55	break;
b5bab85c	56	} else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {
01f2e4ea SF	57	buf->next = wq->bufs[i + 1];
	58	} else {
	59	buf->next = buf + 1;
	60	buf++;
	61	}
	62	}
	63	}
	64
	65	wq->to_use = wq->to_clean = wq->bufs[0];
	66
	67	return 0;
	68	}
	69
	70	void vnic_wq_free(struct vnic_wq *wq)
	71	{
	72	struct vnic_dev *vdev;
	73	unsigned int i;
	74
	75	vdev = wq->vdev;
	76
	77	vnic_dev_free_desc_ring(vdev, &wq->ring);
	78
	79	for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
	80	kfree(wq->bufs[i]);
	81	wq->bufs[i] = NULL;
	82	}
	83
	84	wq->ctrl = NULL;
	85	}
	86
	87	int vnic_wq_alloc(struct vnic_dev vdev, struct vnic_wq wq, unsigned int index,
	88	unsigned int desc_count, unsigned int desc_size)
	89	{
	90	int err;
	91
	92	wq->index = index;
	93	wq->vdev = vdev;
	94
	95	wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
	96	if (!wq->ctrl) {
a7a79deb	97	pr_err("Failed to hook WQ[%d] resource\n", index);
01f2e4ea SF	98	return -EINVAL;
	99	}
	100
	101	vnic_wq_disable(wq);
	102
	103	err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
	104	if (err)
	105	return err;
	106
	107	err = vnic_wq_alloc_bufs(wq);
	108	if (err) {
	109	vnic_wq_free(wq);
	110	return err;
	111	}
	112
	113	return 0;
	114	}
	115
6fdfa970 SF	116	void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
6fdfa970 SF	117	unsigned int fetch_index, unsigned int posted_index,
01f2e4ea SF	118	unsigned int error_interrupt_enable,
	119	unsigned int error_interrupt_offset)
	120	{
	121	u64 paddr;
b5bab85c	122	unsigned int count = wq->ring.desc_count;
01f2e4ea SF	123
	124	paddr = (u64)wq->ring.base_addr \| VNIC_PADDR_TARGET;
	125	writeq(paddr, &wq->ctrl->ring_base);
b5bab85c	126	iowrite32(count, &wq->ctrl->ring_size);
6fdfa970 SF	127	iowrite32(fetch_index, &wq->ctrl->fetch_index);
6fdfa970 SF	128	iowrite32(posted_index, &wq->ctrl->posted_index);
01f2e4ea SF	129	iowrite32(cq_index, &wq->ctrl->cq_index);
	130	iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
	131	iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
	132	iowrite32(0, &wq->ctrl->error_status);
6fdfa970 SF	133
6fdfa970 SF	134	wq->to_use = wq->to_clean =
b5bab85c VK	135	&wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
b5bab85c VK	136	[fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
6fdfa970 SF	137	}
	138
	139	void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
	140	unsigned int error_interrupt_enable,
	141	unsigned int error_interrupt_offset)
	142	{
	143	vnic_wq_init_start(wq, cq_index, 0, 0,
	144	error_interrupt_enable,
	145	error_interrupt_offset);
01f2e4ea SF	146	}
	147
	148	unsigned int vnic_wq_error_status(struct vnic_wq *wq)
	149	{
	150	return ioread32(&wq->ctrl->error_status);
	151	}
	152
	153	void vnic_wq_enable(struct vnic_wq *wq)
	154	{
	155	iowrite32(1, &wq->ctrl->enable);
	156	}
	157
	158	int vnic_wq_disable(struct vnic_wq *wq)
	159	{
	160	unsigned int wait;
	161
	162	iowrite32(0, &wq->ctrl->enable);
	163
	164	/* Wait for HW to ACK disable request */
b6d24eb6	165	for (wait = 0; wait < 1000; wait++) {
01f2e4ea SF	166	if (!(ioread32(&wq->ctrl->running)))
01f2e4ea SF	167	return 0;
b6d24eb6	168	udelay(10);
01f2e4ea SF	169	}
01f2e4ea SF	170
a7a79deb	171	pr_err("Failed to disable WQ[%d]\n", wq->index);
01f2e4ea SF	172
	173	return -ETIMEDOUT;
	174	}
	175
	176	void vnic_wq_clean(struct vnic_wq *wq,
	177	void (buf_clean)(struct vnic_wq wq, struct vnic_wq_buf *buf))
	178	{
	179	struct vnic_wq_buf *buf;
	180
01f2e4ea SF	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	}