[deliverable/linux.git] / drivers / net / enic / vnic_rq.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 <linux/slab.h>

#include "vnic_dev.h"
#include "vnic_rq.h"

static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
{
	struct vnic_rq_buf *buf;
	struct vnic_dev *vdev;
	unsigned int i, j, count = rq->ring.desc_count;
	unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);

	vdev = rq->vdev;

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

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

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

	return 0;
}

void vnic_rq_free(struct vnic_rq *rq)
{
	struct vnic_dev *vdev;
	unsigned int i;

	vdev = rq->vdev;

	vnic_dev_free_desc_ring(vdev, &rq->ring);

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

	rq->ctrl = NULL;
}

int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
	unsigned int desc_count, unsigned int desc_size)
{
	int err;

	rq->index = index;
	rq->vdev = vdev;

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

	vnic_rq_disable(rq);

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

	err = vnic_rq_alloc_bufs(rq);
	if (err) {
		vnic_rq_free(rq);
		return err;
	}

	return 0;
}

void vnic_rq_init_start(struct vnic_rq *rq, 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)rq->ring.base_addr | VNIC_PADDR_TARGET;
	writeq(paddr, &rq->ctrl->ring_base);
	iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size);
	iowrite32(cq_index, &rq->ctrl->cq_index);
	iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
	iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
	iowrite32(0, &rq->ctrl->dropped_packet_count);
	iowrite32(0, &rq->ctrl->error_status);
	iowrite32(fetch_index, &rq->ctrl->fetch_index);
	iowrite32(posted_index, &rq->ctrl->posted_index);

	rq->to_use = rq->to_clean =
		&rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
			[fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
}

void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
	unsigned int error_interrupt_enable,
	unsigned int error_interrupt_offset)
{
	u32 fetch_index;

	/* Use current fetch_index as the ring starting point */
	fetch_index = ioread32(&rq->ctrl->fetch_index);

	vnic_rq_init_start(rq, cq_index,
		fetch_index, fetch_index,
		error_interrupt_enable,
		error_interrupt_offset);
}

unsigned int vnic_rq_error_status(struct vnic_rq *rq)
{
	return ioread32(&rq->ctrl->error_status);
}

void vnic_rq_enable(struct vnic_rq *rq)
{
	iowrite32(1, &rq->ctrl->enable);
}

int vnic_rq_disable(struct vnic_rq *rq)
{
	unsigned int wait;

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

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

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

	return -ETIMEDOUT;
}

void vnic_rq_clean(struct vnic_rq *rq,
	void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
{
	struct vnic_rq_buf *buf;
	u32 fetch_index;

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

	buf = rq->to_clean;

	while (vnic_rq_desc_used(rq) > 0) {

		(*buf_clean)(rq, buf);

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

	/* Use current fetch_index as the ring starting point */
	fetch_index = ioread32(&rq->ctrl->fetch_index);
	rq->to_use = rq->to_clean =
		&rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
			[fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
	iowrite32(fetch_index, &rq->ctrl->posted_index);

	vnic_dev_clear_desc_ring(&rq->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>
5a0e3ad6	25	#include <linux/slab.h>
01f2e4ea SF	26
	27	#include "vnic_dev.h"
	28	#include "vnic_rq.h"
	29
	30	static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
	31	{
	32	struct vnic_rq_buf *buf;
	33	struct vnic_dev *vdev;
	34	unsigned int i, j, count = rq->ring.desc_count;
	35	unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
	36
	37	vdev = rq->vdev;
	38
	39	for (i = 0; i < blks; i++) {
	40	rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC);
	41	if (!rq->bufs[i]) {
	42	printk(KERN_ERR "Failed to alloc rq_bufs\n");
	43	return -ENOMEM;
	44	}
	45	}
	46
	47	for (i = 0; i < blks; i++) {
	48	buf = rq->bufs[i];
	49	for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) {
	50	buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j;
	51	buf->desc = (u8 *)rq->ring.descs +
	52	rq->ring.desc_size * buf->index;
	53	if (buf->index + 1 == count) {
	54	buf->next = rq->bufs[0];
	55	break;
	56	} else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) {
	57	buf->next = rq->bufs[i + 1];
	58	} else {
	59	buf->next = buf + 1;
	60	buf++;
	61	}
	62	}
	63	}
	64
	65	rq->to_use = rq->to_clean = rq->bufs[0];
01f2e4ea SF	66
	67	return 0;
	68	}
	69
	70	void vnic_rq_free(struct vnic_rq *rq)
	71	{
	72	struct vnic_dev *vdev;
	73	unsigned int i;
	74
	75	vdev = rq->vdev;
	76
	77	vnic_dev_free_desc_ring(vdev, &rq->ring);
	78
	79	for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {
	80	kfree(rq->bufs[i]);
	81	rq->bufs[i] = NULL;
	82	}
	83
	84	rq->ctrl = NULL;
	85	}
	86
	87	int vnic_rq_alloc(struct vnic_dev vdev, struct vnic_rq rq, unsigned int index,
	88	unsigned int desc_count, unsigned int desc_size)
	89	{
	90	int err;
	91
	92	rq->index = index;
	93	rq->vdev = vdev;
	94
	95	rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);
	96	if (!rq->ctrl) {
	97	printk(KERN_ERR "Failed to hook RQ[%d] resource\n", index);
	98	return -EINVAL;
	99	}
	100
	101	vnic_rq_disable(rq);
	102
	103	err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size);
	104	if (err)
	105	return err;
	106
	107	err = vnic_rq_alloc_bufs(rq);
	108	if (err) {
	109	vnic_rq_free(rq);
	110	return err;
	111	}
	112
	113	return 0;
	114	}
	115
6fdfa970 SF	116	void vnic_rq_init_start(struct vnic_rq *rq, 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;
01f2e4ea SF	122
	123	paddr = (u64)rq->ring.base_addr \| VNIC_PADDR_TARGET;
	124	writeq(paddr, &rq->ctrl->ring_base);
	125	iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size);
	126	iowrite32(cq_index, &rq->ctrl->cq_index);
	127	iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
	128	iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
	129	iowrite32(0, &rq->ctrl->dropped_packet_count);
	130	iowrite32(0, &rq->ctrl->error_status);
6fdfa970 SF	131	iowrite32(fetch_index, &rq->ctrl->fetch_index);
6fdfa970 SF	132	iowrite32(posted_index, &rq->ctrl->posted_index);
01f2e4ea	133
01f2e4ea SF	134	rq->to_use = rq->to_clean =
	135	&rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
	136	[fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
6fdfa970 SF	137	}
	138
	139	void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
	140	unsigned int error_interrupt_enable,
	141	unsigned int error_interrupt_offset)
	142	{
	143	u32 fetch_index;
01f2e4ea	144
6fdfa970 SF	145	/* Use current fetch_index as the ring starting point */
	146	fetch_index = ioread32(&rq->ctrl->fetch_index);
	147
	148	vnic_rq_init_start(rq, cq_index,
	149	fetch_index, fetch_index,
	150	error_interrupt_enable,
	151	error_interrupt_offset);
01f2e4ea SF	152	}
	153
	154	unsigned int vnic_rq_error_status(struct vnic_rq *rq)
	155	{
	156	return ioread32(&rq->ctrl->error_status);
	157	}
	158
	159	void vnic_rq_enable(struct vnic_rq *rq)
	160	{
	161	iowrite32(1, &rq->ctrl->enable);
	162	}
	163
	164	int vnic_rq_disable(struct vnic_rq *rq)
	165	{
	166	unsigned int wait;
	167
	168	iowrite32(0, &rq->ctrl->enable);
	169
	170	/* Wait for HW to ACK disable request */
b6d24eb6	171	for (wait = 0; wait < 1000; wait++) {
01f2e4ea SF	172	if (!(ioread32(&rq->ctrl->running)))
01f2e4ea SF	173	return 0;
b6d24eb6	174	udelay(10);
01f2e4ea SF	175	}
	176
	177	printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index);
	178
	179	return -ETIMEDOUT;
	180	}
	181
	182	void vnic_rq_clean(struct vnic_rq *rq,
	183	void (buf_clean)(struct vnic_rq rq, struct vnic_rq_buf *buf))
	184	{
	185	struct vnic_rq_buf *buf;
	186	u32 fetch_index;
	187
	188	BUG_ON(ioread32(&rq->ctrl->enable));
	189
	190	buf = rq->to_clean;
	191
	192	while (vnic_rq_desc_used(rq) > 0) {
	193
	194	(*buf_clean)(rq, buf);
	195
	196	buf = rq->to_clean = buf->next;
	197	rq->ring.desc_avail++;
	198	}
	199
	200	/* Use current fetch_index as the ring starting point */
	201	fetch_index = ioread32(&rq->ctrl->fetch_index);
	202	rq->to_use = rq->to_clean =
	203	&rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
	204	[fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
	205	iowrite32(fetch_index, &rq->ctrl->posted_index);
	206
01f2e4ea SF	207	vnic_dev_clear_desc_ring(&rq->ring);
	208	}
	209