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