page.c revision c0dd49bdd68c0d758a67d56f07826f3b45cfc664
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
*/
/*
* Copyright (c) 2006 Oracle. 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 <sys/rds.h>
#include <sys/ib/clients/rdsv3/rdsv3.h>
#include <sys/ib/clients/rdsv3/rdsv3_debug.h>
/*
* @bytes - the number of bytes needed.
*
* XXX - This is different from Linux.
*/
int
rdsv3_page_remainder_alloc(struct rdsv3_scatterlist *scat, unsigned long bytes,
int gfp)
{
caddr_t page;
int ret;
ASSERT(rdsv3_sg_page(scat) == NULL);
if (bytes >= PAGE_SIZE) {
page = kmem_alloc(PAGE_SIZE, gfp);
if (page == NULL) {
ret = -ENOMEM;
} else {
rdsv3_sg_set_page(scat, page, PAGE_SIZE, 0);
ret = 0;
}
goto out;
}
/*
* XXX - This is not same as linux.
*/
page = kmem_alloc(bytes, KM_NOSLEEP);
if (page == NULL) {
ret = -ENOMEM;
goto out;
}
rdsv3_sg_set_page(scat, page, bytes, 0);
ret = 0;
out:
RDSV3_DPRINTF5("rdsv3_page_remainder_alloc", "bytes %lu %p %u",
bytes, rdsv3_sg_page(scat), scat->length);
return (ret);
}