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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19#include <linux/kernel.h>
20#include <linux/module.h>
21
22#include "ath.h"
23#include "trace.h"
24
25MODULE_AUTHOR("Atheros Communications");
26MODULE_DESCRIPTION("Shared library for Atheros wireless LAN cards.");
27MODULE_LICENSE("Dual BSD/GPL");
28
29struct sk_buff *ath_rxbuf_alloc(struct ath_common *common,
30				u32 len,
31				gfp_t gfp_mask)
32{
33	struct sk_buff *skb;
34	u32 off;
35
36	/*
37	 * Cache-line-align.  This is important (for the
38	 * 5210 at least) as not doing so causes bogus data
39	 * in rx'd frames.
40	 */
41
42	/* Note: the kernel can allocate a value greater than
43	 * what we ask it to give us. We really only need 4 KB as that
44	 * is this hardware supports and in fact we need at least 3849
45	 * as that is the MAX AMSDU size this hardware supports.
46	 * Unfortunately this means we may get 8 KB here from the
47	 * kernel... and that is actually what is observed on some
48	 * systems :( */
49	skb = __dev_alloc_skb(len + common->cachelsz - 1, gfp_mask);
50	if (skb != NULL) {
51		off = ((unsigned long) skb->data) % common->cachelsz;
52		if (off != 0)
53			skb_reserve(skb, common->cachelsz - off);
54	} else {
55		pr_err("skbuff alloc of size %u failed\n", len);
56		return NULL;
57	}
58
59	return skb;
60}
61EXPORT_SYMBOL(ath_rxbuf_alloc);
62
63bool ath_is_mybeacon(struct ath_common *common, struct ieee80211_hdr *hdr)
64{
65	return ieee80211_is_beacon(hdr->frame_control) &&
66		!is_zero_ether_addr(common->curbssid) &&
67		ether_addr_equal_64bits(hdr->addr3, common->curbssid);
68}
69EXPORT_SYMBOL(ath_is_mybeacon);
70
71void ath_printk(const char *level, const struct ath_common* common,
72		const char *fmt, ...)
73{
74	struct va_format vaf;
75	va_list args;
76
77	va_start(args, fmt);
78
79	vaf.fmt = fmt;
80	vaf.va = &args;
81
82	if (common && common->hw && common->hw->wiphy) {
83		printk("%sath: %s: %pV",
84		       level, wiphy_name(common->hw->wiphy), &vaf);
85		trace_ath_log(common->hw->wiphy, &vaf);
86	} else {
87		printk("%sath: %pV", level, &vaf);
88	}
89
90	va_end(args);
91}
92EXPORT_SYMBOL(ath_printk);
93