[mirror_ubuntu-focal-kernel.git] / drivers / net / ethernet / cisco / enic / vnic_rq.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_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(count), GFP_ATOMIC);
		if (!rq->bufs[i])
			return -ENOMEM;
	}

	for (i = 0; i < blks; i++) {
		buf = rq->bufs[i];
		for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES(count); j++) {
			buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES(count) + 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(count)) {
				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++) {
		if (rq->bufs[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) {
		pr_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;
}

static 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;
	unsigned int count = rq->ring.desc_count;

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

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 = 0;

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

	if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone  */
		/* Hardware surprise removal: reset fetch_index */
		fetch_index = 0;
	}

	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);
	}

	pr_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;
	unsigned int count = rq->ring.desc_count;
	int i;

	buf = rq->to_clean;

	for (i = 0; i < rq->ring.desc_count; i++) {
		(*buf_clean)(rq, buf);
		buf = buf->next;
	}
	rq->ring.desc_avail = rq->ring.desc_count - 1;

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

	if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone  */
		/* Hardware surprise removal: reset fetch_index */
		fetch_index = 0;
	}
	rq->to_use = rq->to_clean =
		&rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
			[fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
	iowrite32(fetch_index, &rq->ctrl->posted_index);

	vnic_dev_clear_desc_ring(&rq->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_rq.h"
	29
	30	static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
	31	{
	32	struct vnic_rq_buf *buf;
01f2e4ea SF	33	unsigned int i, j, count = rq->ring.desc_count;
	34	unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
	35
01f2e4ea	36	for (i = 0; i < blks; i++) {
b5bab85c	37	rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ(count), GFP_ATOMIC);
e404decb	38	if (!rq->bufs[i])
01f2e4ea	39	return -ENOMEM;
01f2e4ea SF	40	}
	41
	42	for (i = 0; i < blks; i++) {
	43	buf = rq->bufs[i];
b5bab85c VK	44	for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES(count); j++) {
b5bab85c VK	45	buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES(count) + j;
01f2e4ea SF	46	buf->desc = (u8 *)rq->ring.descs +
	47	rq->ring.desc_size * buf->index;
	48	if (buf->index + 1 == count) {
	49	buf->next = rq->bufs[0];
	50	break;
b5bab85c	51	} else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES(count)) {
01f2e4ea SF	52	buf->next = rq->bufs[i + 1];
	53	} else {
	54	buf->next = buf + 1;
	55	buf++;
	56	}
	57	}
	58	}
	59
	60	rq->to_use = rq->to_clean = rq->bufs[0];
01f2e4ea SF	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++) {
83217790 RP	75	if (rq->bufs[i]) {
	76	kfree(rq->bufs[i]);
	77	rq->bufs[i] = NULL;
	78	}
01f2e4ea SF	79	}
	80
	81	rq->ctrl = NULL;
	82	}
	83
	84	int vnic_rq_alloc(struct vnic_dev vdev, struct vnic_rq rq, unsigned int index,
	85	unsigned int desc_count, unsigned int desc_size)
	86	{
	87	int err;
	88
	89	rq->index = index;
	90	rq->vdev = vdev;
	91
	92	rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);
	93	if (!rq->ctrl) {
a7a79deb	94	pr_err("Failed to hook RQ[%d] resource\n", index);
01f2e4ea SF	95	return -EINVAL;
	96	}
	97
	98	vnic_rq_disable(rq);
	99
	100	err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size);
	101	if (err)
	102	return err;
	103
	104	err = vnic_rq_alloc_bufs(rq);
	105	if (err) {
	106	vnic_rq_free(rq);
	107	return err;
	108	}
	109
	110	return 0;
	111	}
	112
2fdba388	113	static void vnic_rq_init_start(struct vnic_rq *rq, unsigned int cq_index,
6fdfa970	114	unsigned int fetch_index, unsigned int posted_index,
01f2e4ea SF	115	unsigned int error_interrupt_enable,
	116	unsigned int error_interrupt_offset)
	117	{
	118	u64 paddr;
b5bab85c	119	unsigned int count = rq->ring.desc_count;
01f2e4ea SF	120
	121	paddr = (u64)rq->ring.base_addr \| VNIC_PADDR_TARGET;
	122	writeq(paddr, &rq->ctrl->ring_base);
b5bab85c	123	iowrite32(count, &rq->ctrl->ring_size);
01f2e4ea SF	124	iowrite32(cq_index, &rq->ctrl->cq_index);
	125	iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
	126	iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
	127	iowrite32(0, &rq->ctrl->dropped_packet_count);
	128	iowrite32(0, &rq->ctrl->error_status);
6fdfa970 SF	129	iowrite32(fetch_index, &rq->ctrl->fetch_index);
6fdfa970 SF	130	iowrite32(posted_index, &rq->ctrl->posted_index);
01f2e4ea	131
01f2e4ea	132	rq->to_use = rq->to_clean =
b5bab85c VK	133	&rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
b5bab85c VK	134	[fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
6fdfa970 SF	135	}
	136
	137	void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
	138	unsigned int error_interrupt_enable,
	139	unsigned int error_interrupt_offset)
	140	{
92e2b469	141	u32 fetch_index = 0;
01f2e4ea	142
6fdfa970 SF	143	/* Use current fetch_index as the ring starting point */
	144	fetch_index = ioread32(&rq->ctrl->fetch_index);
	145
506e1198 VK	146	if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */
	147	/* Hardware surprise removal: reset fetch_index */
	148	fetch_index = 0;
	149	}
	150
6fdfa970 SF	151	vnic_rq_init_start(rq, cq_index,
	152	fetch_index, fetch_index,
	153	error_interrupt_enable,
	154	error_interrupt_offset);
01f2e4ea SF	155	}
	156
	157	unsigned int vnic_rq_error_status(struct vnic_rq *rq)
	158	{
	159	return ioread32(&rq->ctrl->error_status);
	160	}
	161
	162	void vnic_rq_enable(struct vnic_rq *rq)
	163	{
	164	iowrite32(1, &rq->ctrl->enable);
	165	}
	166
	167	int vnic_rq_disable(struct vnic_rq *rq)
	168	{
	169	unsigned int wait;
	170
	171	iowrite32(0, &rq->ctrl->enable);
	172
	173	/* Wait for HW to ACK disable request */
b6d24eb6	174	for (wait = 0; wait < 1000; wait++) {
01f2e4ea SF	175	if (!(ioread32(&rq->ctrl->running)))
01f2e4ea SF	176	return 0;
b6d24eb6	177	udelay(10);
01f2e4ea SF	178	}
01f2e4ea SF	179
a7a79deb	180	pr_err("Failed to disable RQ[%d]\n", rq->index);
01f2e4ea SF	181
	182	return -ETIMEDOUT;
	183	}
	184
	185	void vnic_rq_clean(struct vnic_rq *rq,
	186	void (buf_clean)(struct vnic_rq rq, struct vnic_rq_buf *buf))
	187	{
	188	struct vnic_rq_buf *buf;
	189	u32 fetch_index;
b5bab85c	190	unsigned int count = rq->ring.desc_count;
8b13b4e0	191	int i;
01f2e4ea	192
01f2e4ea SF	193	buf = rq->to_clean;
01f2e4ea SF	194
8b13b4e0	195	for (i = 0; i < rq->ring.desc_count; i++) {
01f2e4ea	196	(*buf_clean)(rq, buf);
8b13b4e0	197	buf = buf->next;
01f2e4ea	198	}
8b13b4e0	199	rq->ring.desc_avail = rq->ring.desc_count - 1;
01f2e4ea SF	200
	201	/* Use current fetch_index as the ring starting point */
	202	fetch_index = ioread32(&rq->ctrl->fetch_index);
506e1198 VK	203
	204	if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */
	205	/* Hardware surprise removal: reset fetch_index */
	206	fetch_index = 0;
	207	}
01f2e4ea	208	rq->to_use = rq->to_clean =
b5bab85c VK	209	&rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES(count)]
b5bab85c VK	210	[fetch_index % VNIC_RQ_BUF_BLK_ENTRIES(count)];
01f2e4ea SF	211	iowrite32(fetch_index, &rq->ctrl->posted_index);
01f2e4ea SF	212
01f2e4ea SF	213	vnic_dev_clear_desc_ring(&rq->ring);
	214	}
	215