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); 93