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/*
* Copyright 2008-2010 Cisco Systems, Inc. All rights reserved.
* Copyright 2007 Nuova Systems, Inc. All rights reserved.
*
* Copyright (c) 2014, Cisco Systems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "vnic_dev.h"
#include "vnic_rq.h"
void vnic_rq_free(struct vnic_rq *rq)
{
struct vnic_dev *vdev;
vdev = rq->vdev;
vnic_dev_free_desc_ring(vdev, &rq->ring);
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 rc;
char res_name[NAME_MAX];
static int instance;
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);
snprintf(res_name, sizeof(res_name), "%d-rq-%d", instance++, index);
rc = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size,
rq->socket_id, res_name);
return rc;
}
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);
}
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);
rq->rxst_idx = 0;
rq->tot_pkts = 0;
}
void vnic_rq_error_out(struct vnic_rq *rq, unsigned int error)
{
iowrite32(error, &rq->ctrl->error_status);
}
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 rte_mbuf **buf))
{
struct rte_mbuf **buf;
u32 fetch_index, i;
unsigned int count = rq->ring.desc_count;
buf = &rq->mbuf_ring[0];
for (i = 0; i < count; i++) {
(*buf_clean)(buf);
buf++;
}
rq->ring.desc_avail = count - 1;
rq->rx_nb_hold = 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;
}
iowrite32(fetch_index, &rq->ctrl->posted_index);
vnic_dev_clear_desc_ring(&rq->ring);
}
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