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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 retailuce 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 do_mmap_info(struct rxe_dev *rxe,
struct ib_udata *udata,
bool is_req,
struct ib_ucontext *context,
struct rxe_queue_buf *buf,
size_t buf_size,
struct rxe_mmap_info **ip_p)
{
int err;
u32 len, offset;
struct rxe_mmap_info *ip = NULL;
if (udata) {
if (is_req) {
len = udata->outlen - sizeof(struct mminfo);
offset = sizeof(struct mminfo);
} else {
len = udata->outlen;
offset = 0;
}
if (len < sizeof(ip->info))
goto err1;
ip = rxe_create_mmap_info(rxe, buf_size, context, buf);
if (!ip)
goto err1;
err = copy_to_user(udata->outbuf + offset, &ip->info,
sizeof(ip->info));
if (err)
goto err2;
spin_lock_bh(&rxe->pending_lock);
list_add(&ip->pending_mmaps, &rxe->pending_mmaps);
spin_unlock_bh(&rxe->pending_lock);
}
*ip_p = ip;
return 0;
err2:
kfree(ip);
err1:
return -EINVAL;
}
inline void rxe_queue_reset(struct rxe_queue *q)
{
/* queue is comprised from header and the memory
* of the actual queue. See "struct rxe_queue_buf" in rxe_queue.h
* reset only the queue itself and not the management header
*/
memset(q->buf->data, 0, q->buf_size - sizeof(struct rxe_queue_buf));
}
struct rxe_queue *rxe_queue_init(struct rxe_dev *rxe,
int *num_elem,
unsigned int elem_size)
{
struct rxe_queue *q;
size_t buf_size;
unsigned int num_slots;
/* num_elem == 0 is allowed, but uninteresting */
if (*num_elem < 0)
goto err1;
q = kmalloc(sizeof(*q), GFP_KERNEL);
if (!q)
goto err1;
q->rxe = rxe;
/* used in resize, only need to copy used part of queue */
q->elem_size = elem_size;
/* pad element up to at least a cacheline and always a power of 2 */
if (elem_size < cache_line_size())
elem_size = cache_line_size();
elem_size = roundup_pow_of_two(elem_size);
q->log2_elem_size = order_base_2(elem_size);
num_slots = *num_elem + 1;
num_slots = roundup_pow_of_two(num_slots);
q->index_mask = num_slots - 1;
buf_size = sizeof(struct rxe_queue_buf) + num_slots * elem_size;
q->buf = vmalloc_user(buf_size);
if (!q->buf)
goto err2;
q->buf->log2_elem_size = q->log2_elem_size;
q->buf->index_mask = q->index_mask;
q->buf_size = buf_size;
*num_elem = num_slots - 1;
return q;
err2:
kfree(q);
err1:
return NULL;
}
/* copies elements from original q to new q and then swaps the contents of the
* two q headers. This is so that if anyone is holding a pointer to q it will
* still work
*/
static int resize_finish(struct rxe_queue *q, struct rxe_queue *new_q,
unsigned int num_elem)
{
if (!queue_empty(q) && (num_elem < queue_count(q)))
return -EINVAL;
while (!queue_empty(q)) {
memcpy(producer_addr(new_q), consumer_addr(q),
new_q->elem_size);
advance_producer(new_q);
advance_consumer(q);
}
swap(*q, *new_q);
return 0;
}
int rxe_queue_resize(struct rxe_queue *q,
unsigned int *num_elem_p,
unsigned int elem_size,
struct ib_ucontext *context,
struct ib_udata *udata,
spinlock_t *producer_lock,
spinlock_t *consumer_lock)
{
struct rxe_queue *new_q;
unsigned int num_elem = *num_elem_p;
int err;
unsigned long flags = 0, flags1;
new_q = rxe_queue_init(q->rxe, &num_elem, elem_size);
if (!new_q)
return -ENOMEM;
err = do_mmap_info(new_q->rxe, udata, false, context, new_q->buf,
new_q->buf_size, &new_q->ip);
if (err) {
vfree(new_q->buf);
kfree(new_q);
goto err1;
}
spin_lock_irqsave(consumer_lock, flags1);
if (producer_lock) {
spin_lock_irqsave(producer_lock, flags);
err = resize_finish(q, new_q, num_elem);
spin_unlock_irqrestore(producer_lock, flags);
} else {
err = resize_finish(q, new_q, num_elem);
}
spin_unlock_irqrestore(consumer_lock, flags1);
rxe_queue_cleanup(new_q); /* new/old dep on err */
if (err)
goto err1;
*num_elem_p = num_elem;
return 0;
err1:
return err;
}
void rxe_queue_cleanup(struct rxe_queue *q)
{
if (q->ip)
kref_put(&q->ip->ref, rxe_mmap_release);
else
vfree(q->buf);
kfree(q);
}
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