[linux-2.6-block.git] / drivers / scsi / fnic / 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/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;
	unsigned int i, j, count = rq->ring.desc_count;
	unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);

	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];
	rq->buf_index = 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(struct vnic_rq *rq, unsigned int cq_index,
	unsigned int error_interrupt_enable,
	unsigned int error_interrupt_offset)
{
	u64 paddr;
	u32 fetch_index;

	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);

	/* 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);

	rq->buf_index = 0;
}

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 < 100; wait++) {
		if (!(ioread32(&rq->ctrl->running)))
			return 0;
		udelay(1);
	}

	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;

	WARN_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);

	rq->buf_index = 0;

	vnic_dev_clear_desc_ring(&rq->ring);
}
Commit	Line	Data
5df6d737 AJ	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	#include <linux/errno.h>
	20	#include <linux/types.h>
	21	#include <linux/pci.h>
	22	#include <linux/delay.h>
5a0e3ad6	23	#include <linux/slab.h>
5df6d737 AJ	24	#include "vnic_dev.h"
	25	#include "vnic_rq.h"
	26
	27	static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
	28	{
	29	struct vnic_rq_buf *buf;
5df6d737 AJ	30	unsigned int i, j, count = rq->ring.desc_count;
	31	unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
	32
5df6d737 AJ	33	for (i = 0; i < blks; i++) {
	34	rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC);
	35	if (!rq->bufs[i]) {
	36	printk(KERN_ERR "Failed to alloc rq_bufs\n");
	37	return -ENOMEM;
	38	}
	39	}
	40
	41	for (i = 0; i < blks; i++) {
	42	buf = rq->bufs[i];
	43	for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) {
	44	buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j;
	45	buf->desc = (u8 *)rq->ring.descs +
	46	rq->ring.desc_size * buf->index;
	47	if (buf->index + 1 == count) {
	48	buf->next = rq->bufs[0];
	49	break;
	50	} else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) {
	51	buf->next = rq->bufs[i + 1];
	52	} else {
	53	buf->next = buf + 1;
	54	buf++;
	55	}
	56	}
	57	}
	58
	59	rq->to_use = rq->to_clean = rq->bufs[0];
	60	rq->buf_index = 0;
	61
	62	return 0;
	63	}
	64
	65	void vnic_rq_free(struct vnic_rq *rq)
	66	{
	67	struct vnic_dev *vdev;
	68	unsigned int i;
	69
	70	vdev = rq->vdev;
	71
	72	vnic_dev_free_desc_ring(vdev, &rq->ring);
	73
	74	for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {
	75	kfree(rq->bufs[i]);
	76	rq->bufs[i] = NULL;
	77	}
	78
	79	rq->ctrl = NULL;
	80	}
	81
	82	int vnic_rq_alloc(struct vnic_dev vdev, struct vnic_rq rq, unsigned int index,
	83	unsigned int desc_count, unsigned int desc_size)
	84	{
	85	int err;
	86
	87	rq->index = index;
	88	rq->vdev = vdev;
	89
	90	rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);
	91	if (!rq->ctrl) {
	92	printk(KERN_ERR "Failed to hook RQ[%d] resource\n", index);
	93	return -EINVAL;
	94	}
	95
	96	vnic_rq_disable(rq);
97
98	err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size);
99	if (err)
100	return err;
101
102	err = vnic_rq_alloc_bufs(rq);
103	if (err) {
104	vnic_rq_free(rq);
105	return err;
106	}
107
108	return 0;
109	}
110
111	void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
112	unsigned int error_interrupt_enable,
113	unsigned int error_interrupt_offset)
114	{
115	u64 paddr;
116	u32 fetch_index;
117
118	paddr = (u64)rq->ring.base_addr \| VNIC_PADDR_TARGET;
119	writeq(paddr, &rq->ctrl->ring_base);
120	iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size);
121	iowrite32(cq_index, &rq->ctrl->cq_index);
122	iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
123	iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
124	iowrite32(0, &rq->ctrl->dropped_packet_count);
125	iowrite32(0, &rq->ctrl->error_status);
126
127	/* Use current fetch_index as the ring starting point */
128	fetch_index = ioread32(&rq->ctrl->fetch_index);
129	rq->to_use = rq->to_clean =
130	&rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
131	[fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
132	iowrite32(fetch_index, &rq->ctrl->posted_index);
133
134	rq->buf_index = 0;
135	}
136
137	unsigned int vnic_rq_error_status(struct vnic_rq *rq)
138	{
139	return ioread32(&rq->ctrl->error_status);
140	}
141
142	void vnic_rq_enable(struct vnic_rq *rq)
143	{
144	iowrite32(1, &rq->ctrl->enable);
145	}
146
147	int vnic_rq_disable(struct vnic_rq *rq)
148	{
149	unsigned int wait;
150
151	iowrite32(0, &rq->ctrl->enable);
152
153	/* Wait for HW to ACK disable request */
154	for (wait = 0; wait < 100; wait++) {
155	if (!(ioread32(&rq->ctrl->running)))
156	return 0;
157	udelay(1);
158	}
159
160	printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index);
161
162	return -ETIMEDOUT;
163	}
164
165	void vnic_rq_clean(struct vnic_rq *rq,
166	void (buf_clean)(struct vnic_rq rq, struct vnic_rq_buf *buf))
167	{
168	struct vnic_rq_buf *buf;
169	u32 fetch_index;
170
5271d1ca	171	WARN_ON(ioread32(&rq->ctrl->enable));
5df6d737 AJ	172
	173	buf = rq->to_clean;
	174
	175	while (vnic_rq_desc_used(rq) > 0) {
	176
	177	(*buf_clean)(rq, buf);
	178
	179	buf = rq->to_clean = buf->next;
	180	rq->ring.desc_avail++;
	181	}
	182
	183	/* Use current fetch_index as the ring starting point */
	184	fetch_index = ioread32(&rq->ctrl->fetch_index);
	185	rq->to_use = rq->to_clean =
	186	&rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
	187	[fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
	188	iowrite32(fetch_index, &rq->ctrl->posted_index);
	189
	190	rq->buf_index = 0;
	191
	192	vnic_dev_clear_desc_ring(&rq->ring);
	193	}
	194