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
  25 MODULE_AUTHOR("Atheros Communications");
  26 MODULE_DESCRIPTION("Shared library for Atheros wireless LAN cards.");
  27 MODULE_LICENSE("Dual BSD/GPL");
  28
  29 struct 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 }
  61 EXPORT_SYMBOL(ath_rxbuf_alloc);
  62
  63 bool 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 }
  69 EXPORT_SYMBOL(ath_is_mybeacon);
  70
  71 void 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 }
  92 EXPORT_SYMBOL(ath_printk);