1 /*
2 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
3 */
4
5 /*
6 * This file contains code imported from the OFED rds source file page.c
7 * Oracle elects to have and use the contents of page.c under and governed
8 * by the OpenIB.org BSD license (see below for full license text). However,
9 * the following notice accompanied the original version of this file:
10 */
11
12 /*
13 * Copyright (c) 2006 Oracle. All rights reserved.
14 *
15 * This software is available to you under a choice of one of two
16 * licenses. You may choose to be licensed under the terms of the GNU
17 * General Public License (GPL) Version 2, available from the file
18 * COPYING in the main directory of this source tree, or the
19 * OpenIB.org BSD license below:
20 *
21 * Redistribution and use in source and binary forms, with or
22 * without modification, are permitted provided that the following
23 * conditions are met:
24 *
25 * - Redistributions of source code must retain the above
26 * copyright notice, this list of conditions and the following
27 * disclaimer.
28 *
29 * - Redistributions in binary form must reproduce the above
30 * copyright notice, this list of conditions and the following
31 * disclaimer in the documentation and/or other materials
32 * provided with the distribution.
33 *
34 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
35 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
36 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
37 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
38 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
39 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
40 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
41 * SOFTWARE.
42 *
43 */
44 #include <sys/rds.h>
45
46 #include <sys/ib/clients/rdsv3/rdsv3.h>
47 #include <sys/ib/clients/rdsv3/rdsv3_debug.h>
48
49 /*
50 * @bytes - the number of bytes needed.
51 *
52 * XXX - This is different from Linux.
53 */
54 int
rdsv3_page_remainder_alloc(struct rdsv3_scatterlist * scat,unsigned long bytes,int gfp)55 rdsv3_page_remainder_alloc(struct rdsv3_scatterlist *scat, unsigned long bytes,
56 int gfp)
57 {
58 caddr_t page;
59 int ret;
60
61 ASSERT(rdsv3_sg_page(scat) == NULL);
62
63 if (bytes >= PAGE_SIZE) {
64 page = kmem_alloc(PAGE_SIZE, gfp);
65 if (!page) {
66 ret = -ENOMEM;
67 } else {
68 rdsv3_sg_set_page(scat, page, PAGE_SIZE, 0);
69 ret = 0;
70 }
71 goto out;
72 }
73
74 /*
75 * XXX - This is not same as linux.
76 */
77 page = kmem_alloc(bytes, KM_NOSLEEP);
78 if (!page) {
79 ret = -ENOMEM;
80 goto out;
81 }
82
83 rdsv3_sg_set_page(scat, page, bytes, 0);
84 ret = 0;
85 out:
86 RDSV3_DPRINTF5("rdsv3_page_remainder_alloc", "bytes %lu %p %u",
87 bytes, rdsv3_sg_page(scat), scat->length);
88 return (ret);
89 }
90