1 /*
2 * Copyright (c) 2009 Atheros Communications Inc.
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19
20 #include "ath.h"
21
22 MODULE_AUTHOR("Atheros Communications");
23 MODULE_DESCRIPTION("Shared library for Atheros wireless LAN cards.");
24 MODULE_LICENSE("Dual BSD/GPL");
25
ath_rxbuf_alloc(struct ath_common * common,u32 len,gfp_t gfp_mask)26 struct sk_buff *ath_rxbuf_alloc(struct ath_common *common,
27 u32 len,
28 gfp_t gfp_mask)
29 {
30 struct sk_buff *skb;
31 u32 off;
32
33 /*
34 * Cache-line-align. This is important (for the
35 * 5210 at least) as not doing so causes bogus data
36 * in rx'd frames.
37 */
38
39 /* Note: the kernel can allocate a value greater than
40 * what we ask it to give us. We really only need 4 KB as that
41 * is this hardware supports and in fact we need at least 3849
42 * as that is the MAX AMSDU size this hardware supports.
43 * Unfortunately this means we may get 8 KB here from the
44 * kernel... and that is actually what is observed on some
45 * systems :( */
46 skb = __dev_alloc_skb(len + common->cachelsz - 1, gfp_mask);
47 if (skb != NULL) {
48 off = ((unsigned long) skb->data) % common->cachelsz;
49 if (off != 0)
50 skb_reserve(skb, common->cachelsz - off);
51 } else {
52 printk(KERN_ERR "skbuff alloc of size %u failed\n", len);
53 return NULL;
54 }
55
56 return skb;
57 }
58 EXPORT_SYMBOL(ath_rxbuf_alloc);
59
ath_printk(const char * level,struct ath_common * common,const char * fmt,...)60 int ath_printk(const char *level, struct ath_common *common,
61 const char *fmt, ...)
62 {
63 struct va_format vaf;
64 va_list args;
65 int rtn;
66
67 va_start(args, fmt);
68
69 vaf.fmt = fmt;
70 vaf.va = &args;
71
72 rtn = printk("%sath: %pV", level, &vaf);
73
74 va_end(args);
75
76 return rtn;
77 }
78 EXPORT_SYMBOL(ath_printk);
79