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/*
* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
* Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - 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.
*
* 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/vmalloc.h>
#include "rxe.h"
#include "rxe_loc.h"
#include "rxe_queue.h"
int rxe_cq_chk_attr(struct rxe_dev *rxe, struct rxe_cq *cq,
int cqe, int comp_vector)
{
int count;
if (cqe <= 0) {
pr_warn("cqe(%d) <= 0\n", cqe);
goto err1;
}
if (cqe > rxe->attr.max_cqe) {
pr_warn("cqe(%d) > max_cqe(%d)\n",
cqe, rxe->attr.max_cqe);
goto err1;
}
if (cq) {
count = queue_count(cq->queue);
if (cqe < count) {
pr_warn("cqe(%d) < current # elements in queue (%d)",
cqe, count);
goto err1;
}
}
return 0;
err1:
return -EINVAL;
}
static void rxe_send_complete(unsigned long data)
{
struct rxe_cq *cq = (struct rxe_cq *)data;
unsigned long flags;
spin_lock_irqsave(&cq->cq_lock, flags);
if (cq->is_dying) {
spin_unlock_irqrestore(&cq->cq_lock, flags);
return;
}
spin_unlock_irqrestore(&cq->cq_lock, flags);
cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context);
}
int rxe_cq_from_init(struct rxe_dev *rxe, struct rxe_cq *cq, int cqe,
int comp_vector, struct ib_ucontext *context,
struct rxe_create_cq_resp __user *uresp)
{
int err;
cq->queue = rxe_queue_init(rxe, &cqe,
sizeof(struct rxe_cqe));
if (!cq->queue) {
pr_warn("unable to create cq\n");
return -ENOMEM;
}
err = do_mmap_info(rxe, uresp ? &uresp->mi : NULL, context,
cq->queue->buf, cq->queue->buf_size, &cq->queue->ip);
if (err) {
vfree(cq->queue->buf);
kfree(cq->queue);
return err;
}
if (uresp)
cq->is_user = 1;
cq->is_dying = false;
tasklet_init(&cq->comp_task, rxe_send_complete, (unsigned long)cq);
spin_lock_init(&cq->cq_lock);
cq->ibcq.cqe = cqe;
return 0;
}
int rxe_cq_resize_queue(struct rxe_cq *cq, int cqe,
struct rxe_resize_cq_resp __user *uresp)
{
int err;
err = rxe_queue_resize(cq->queue, (unsigned int *)&cqe,
sizeof(struct rxe_cqe),
cq->queue->ip ? cq->queue->ip->context : NULL,
uresp ? &uresp->mi : NULL, NULL, &cq->cq_lock);
if (!err)
cq->ibcq.cqe = cqe;
return err;
}
int rxe_cq_post(struct rxe_cq *cq, struct rxe_cqe *cqe, int solicited)
{
struct ib_event ev;
unsigned long flags;
spin_lock_irqsave(&cq->cq_lock, flags);
if (unlikely(queue_full(cq->queue))) {
spin_unlock_irqrestore(&cq->cq_lock, flags);
if (cq->ibcq.event_handler) {
ev.device = cq->ibcq.device;
ev.element.cq = &cq->ibcq;
ev.event = IB_EVENT_CQ_ERR;
cq->ibcq.event_handler(&ev, cq->ibcq.cq_context);
}
return -EBUSY;
}
memcpy(producer_addr(cq->queue), cqe, sizeof(*cqe));
/* make sure all changes to the CQ are written before we update the
* producer pointer
*/
smp_wmb();
advance_producer(cq->queue);
spin_unlock_irqrestore(&cq->cq_lock, flags);
if ((cq->notify == IB_CQ_NEXT_COMP) ||
(cq->notify == IB_CQ_SOLICITED && solicited)) {
cq->notify = 0;
tasklet_schedule(&cq->comp_task);
}
return 0;
}
void rxe_cq_disable(struct rxe_cq *cq)
{
unsigned long flags;
spin_lock_irqsave(&cq->cq_lock, flags);
cq->is_dying = true;
spin_unlock_irqrestore(&cq->cq_lock, flags);
}
void rxe_cq_cleanup(struct rxe_pool_entry *arg)
{
struct rxe_cq *cq = container_of(arg, typeof(*cq), pelem);
if (cq->queue)
rxe_queue_cleanup(cq->queue);
}
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