LXR linux/drivers/net/wireless/ath/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/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
  94const char *ath_bus_type_strings[] = {
  95        [ATH_PCI] = "pci",
  96        [ATH_AHB] = "ahb",
  97        [ATH_USB] = "usb",
  98};
  99EXPORT_SYMBOL(ath_bus_type_strings);
 100