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/export.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22
23 #include "ath.h"
24 #include "trace.h"
25
26 MODULE_AUTHOR("Atheros Communications");
27 MODULE_DESCRIPTION("Shared library for Atheros wireless LAN cards.");
28 MODULE_LICENSE("Dual BSD/GPL");
29
ath_rxbuf_alloc(struct ath_common * common,u32 len,gfp_t gfp_mask)30 struct sk_buff *ath_rxbuf_alloc(struct ath_common *common,
31 u32 len,
32 gfp_t gfp_mask)
33 {
34 struct sk_buff *skb;
35 u32 off;
36
37 /*
38 * Cache-line-align. This is important (for the
39 * 5210 at least) as not doing so causes bogus data
40 * in rx'd frames.
41 */
42
43 /* Note: the kernel can allocate a value greater than
44 * what we ask it to give us. We really only need 4 KB as that
45 * is this hardware supports and in fact we need at least 3849
46 * as that is the MAX AMSDU size this hardware supports.
47 * Unfortunately this means we may get 8 KB here from the
48 * kernel... and that is actually what is observed on some
49 * systems :( */
50 skb = __dev_alloc_skb(len + common->cachelsz - 1, gfp_mask);
51 if (skb != NULL) {
52 off = ((unsigned long) skb->data) % common->cachelsz;
53 if (off != 0)
54 skb_reserve(skb, common->cachelsz - off);
55 } else {
56 pr_err("skbuff alloc of size %u failed\n", len);
57 return NULL;
58 }
59
60 return skb;
61 }
62 EXPORT_SYMBOL(ath_rxbuf_alloc);
63
ath_is_mybeacon(struct ath_common * common,struct ieee80211_hdr * hdr)64 bool ath_is_mybeacon(struct ath_common *common, struct ieee80211_hdr *hdr)
65 {
66 return ieee80211_is_beacon(hdr->frame_control) &&
67 !is_zero_ether_addr(common->curbssid) &&
68 ether_addr_equal_64bits(hdr->addr3, common->curbssid);
69 }
70 EXPORT_SYMBOL(ath_is_mybeacon);
71
ath_printk(const char * level,const struct ath_common * common,const char * fmt,...)72 void ath_printk(const char *level, const struct ath_common* common,
73 const char *fmt, ...)
74 {
75 struct va_format vaf;
76 va_list args;
77
78 va_start(args, fmt);
79
80 vaf.fmt = fmt;
81 vaf.va = &args;
82
83 if (common && common->hw && common->hw->wiphy) {
84 printk("%sath: %s: %pV",
85 level, wiphy_name(common->hw->wiphy), &vaf);
86 trace_ath_log(common->hw->wiphy, &vaf);
87 } else {
88 printk("%sath: %pV", level, &vaf);
89 }
90
91 va_end(args);
92 }
93 EXPORT_SYMBOL(ath_printk);
94
95 const char *ath_bus_type_strings[] = {
96 [ATH_PCI] = "pci",
97 [ATH_AHB] = "ahb",
98 [ATH_USB] = "usb",
99 };
100 EXPORT_SYMBOL(ath_bus_type_strings);
101