main.c

  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
 26MODULE_AUTHOR("Atheros Communications");
 27MODULE_DESCRIPTION("Shared library for Atheros wireless LAN cards.");
 28MODULE_LICENSE("Dual BSD/GPL");
 29
 30struct 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}
 62EXPORT_SYMBOL(ath_rxbuf_alloc);
 63
 64bool 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}
 70EXPORT_SYMBOL(ath_is_mybeacon);
 71
 72void 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}
 93EXPORT_SYMBOL(ath_printk);
 94
 95const char *ath_bus_type_strings[] = {
 96	[ATH_PCI] = "pci",
 97	[ATH_AHB] = "ahb",
 98	[ATH_USB] = "usb",
 99};
100EXPORT_SYMBOL(ath_bus_type_strings);