drivers/net/wireless/madwifi/net80211/ieee80211_skb.h

   1 /*-
   2  * Copyright (c) 2007 Michael Taylor, Apprion
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  *
  27  * $Id: ieee80211_skb.h 2647 2007-08-09 08:43:58Z mtaylor $
  28  */
  29 #ifndef _NET80211_IEEE80211_SKB_H_
  30 #define _NET80211_IEEE80211_SKB_H_
  31
  32 /*******************************************************************************
  33  * Globals
  34  ******************************************************************************/
  35
  36 #ifdef IEEE80211_DEBUG_REFCNT
  37
  38 /* Count of currently tracked skbs */
  39 extern atomic_t skb_total_counter;
  40 /* Count of currently tracked skbs' references */
  41 extern atomic_t skb_refs_counter;
  42
  43 #endif /* #ifdef IEEE80211_DEBUG_REFCNT */
  44
  45 /*******************************************************************************
  46  * Public API
  47  ******************************************************************************/
  48
  49 /* SKB_XX(...) macros will blow up if _skb is NULL (detect problems early) */
  50 #define SKB_CB(_skb)            ((struct ieee80211_cb *)(_skb)->cb)
  51 #define SKB_NI(_skb)            (SKB_CB(_skb)->ni)
  52
  53 #define M_FLAG_SET(_skb, _flag) \
  54         (SKB_CB(_skb)->flags |= (_flag))
  55 #define M_FLAG_CLR(_skb, _flag) \
  56         (SKB_CB(_skb)->flags &= ~(_flag))
  57 #define M_FLAG_GET(_skb, _flag) \
  58         (SKB_CB(_skb)->flags & (_flag))
  59 #define M_FLAG_KEEP_ONLY(_skb, _flag) \
  60         (SKB_CB(_skb)->flags &= (_flag))
  61
  62 #define M_PWR_SAV_SET(skb) M_FLAG_SET((skb), M_PWR_SAV)
  63 #define M_PWR_SAV_CLR(skb) M_FLAG_CLR((skb), M_PWR_SAV)
  64 #define M_PWR_SAV_GET(skb) M_FLAG_GET((skb), M_PWR_SAV)
  65
  66 /* SKBs on the power save queue are tagged with an age and
  67  * timed out.  We reuse the hardware checksum field in the
  68  * mbuf packet header to store this data.
  69  * XXX: use private CB area. */
  70 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
  71 #define skb_age csum_offset
  72 #else
  73 #define skb_age csum
  74 #endif
  75
  76 #define M_AGE_SET(_skb,_v)      ((_skb)->skb_age = (_v))
  77 #define M_AGE_GET(_skb)         ((_skb)->skb_age)
  78 #define M_AGE_SUB(_skb,_adj)    ((_skb)->skb_age -= (_adj))
  79
  80 /* ieee80211_dev_kfree_skb will release one reference from SKB.
  81  * If SKB refcount is going to zero:
  82  *  - Free the node reference and set it to null.
  83  *  - Break the linked list, clearing next skb's prev pointer if possible. */
  84 void ieee80211_dev_kfree_skb(struct sk_buff **pskb);
  85
  86 static inline void ieee80211_skb_copy_noderef(struct sk_buff *src,
  87                 struct sk_buff *dst)
  88 {
  89         if (SKB_NI(src) != NULL)
  90                 SKB_NI(dst) = ieee80211_ref_node(SKB_NI(src));
  91 }
  92
  93 /* ieee80211_dev_kfree_skb_list will invoke ieee80211_dev_kfree_skb on each node in
  94  * a list of skbs, starting with the first. */
  95 void ieee80211_dev_kfree_skb_list(struct sk_buff **pskb);
  96
  97 struct sk_buff *ieee80211_dev_alloc_skb(int size);
  98
  99 void ieee80211_skb_track(struct sk_buff *skb);
 100 void ieee80211_skb_untrack(struct sk_buff *skb);
 101
 102 #ifdef IEEE80211_DEBUG_REFCNT
 103 int ieee80211_skb_counter(void);
 104 int ieee80211_skb_references(void);
 105 #else
 106 #define ieee80211_skb_counter() (0)
 107 #define ieee80211_skb_references() (0)
 108 #endif
 109
 110 /*******************************************************************************
 111  * skbuff leak/refcount debugging Replacement Functions
 112  ******************************************************************************/
 113
 114 #ifdef IEEE80211_DEBUG_REFCNT
 115
 116 int vlan_hwaccel_rx_debug(struct sk_buff *skb, struct vlan_group *grp,
 117                 unsigned short vlan_tag, const char *func, int line);
 118 int netif_rx_debug(struct sk_buff *skb, const char *func, int line);
 119 struct sk_buff *alloc_skb_debug(unsigned int length, gfp_t gfp_mask,
 120                 const char *func, int line);
 121 struct sk_buff *dev_alloc_skb_debug(unsigned int length,
 122                 const char *func, int line);
 123 struct sk_buff *skb_clone_debug(struct sk_buff *skb, gfp_t pri,
 124                 const char *func, int line);
 125 struct sk_buff *skb_copy_debug(struct sk_buff *skb, gfp_t pri,
 126                 const char *func, int line);
 127 struct sk_buff *skb_get_debug(struct sk_buff *skb,
 128                 const char *func, int line);
 129 struct sk_buff *skb_realloc_headroom_debug(struct sk_buff *skb, unsigned int headroom,
 130                 const char *func, int line);
 131 struct sk_buff *pskb_copy_debug(struct sk_buff *skb, gfp_t pri,
 132                 const char *func, int line);
 133 int dev_queue_xmit_debug(struct sk_buff *skb,
 134                 const char *func, int line);
 135 struct sk_buff *skb_share_check_debug(struct sk_buff *skb, gfp_t pri,
 136                 const char *func, int line);
 137 void kfree_skb_fast_debug(struct sk_buff *skb,
 138                 const char *func, int line);
 139 struct sk_buff *skb_unshare_debug(struct sk_buff *skb, gfp_t pri,
 140                 const char *func, int line);
 141 struct sk_buff *skb_copy_expand_debug(const struct sk_buff *skb, int newheadroom,
 142                 int newtailroom, gfp_t gfp_mask,
 143                 const char *func, int line);
 144
 145 #undef alloc_skb
 146 #undef dev_alloc_skb
 147 #undef dev_kfree_skb
 148 #undef dev_kfree_skb_any
 149 #undef dev_kfree_skb_irq
 150 #undef dev_queue_xmit
 151 #undef kfree_skb
 152 #undef kfree_skb_fast
 153 #undef netif_rx
 154 #undef pskb_copy
 155 #undef skb_clone
 156 #undef skb_copy
 157 #undef skb_copy_expand
 158 #undef skb_get
 159 #undef skb_realloc_headroom
 160 #undef skb_share_check
 161 #undef skb_unshare
 162 #undef vlan_hwaccel_rx
 163
 164 #define skb_unshare(_skb, _pri) \
 165         skb_unshare_debug(_skb, _pri, __func__, __LINE__)
 166 #define skb_copy_expand(_skb, _newheadroom, _newtailroom, _gfp_mask) \
 167         skb_copy_expand_debug(_skb, _newheadroom, _newtailroom, _gfp_mask, __func__, __LINE__)
 168 #define vlan_hwaccel_rx(_skb, _grp, _tag) \
 169         vlan_hwaccel_rx_debug(_skb, _grp, _tag, __func__, __LINE__)
 170 #define netif_rx(_skb) \
 171         netif_rx_debug(_skb, __func__, __LINE__)
 172 #define alloc_skb(_length, _gfp_mask) \
 173         alloc_skb_debug(_length, _gfp_mask, __func__, __LINE__)
 174 #define dev_alloc_skb(_length) \
 175         dev_alloc_skb_debug(_length, __func__, __LINE__)
 176 #define dev_kfree_skb_irq(_skb) \
 177         unref_skb(_skb, UNREF_USE_DEV_KFREE_SKB_IRQ, __func__, __LINE__)
 178 #define dev_kfree_skb_any(_skb) \
 179         unref_skb(_skb, UNREF_USE_DEV_KFREE_SKB_ANY, __func__, __LINE__)
 180 #define dev_kfree_skb(_skb) \
 181         unref_skb(_skb, UNREF_USE_DEV_KFREE_SKB, __func__, __LINE__)
 182 #define kfree_skb(_skb) \
 183         unref_skb(_skb, UNREF_USE_KFREE_SKB, __func__, __LINE__)
 184 #define skb_clone(_skb, _pri) \
 185         skb_clone_debug(_skb, _pri, __func__, __LINE__)
 186 #define skb_share_check(_skb, _pri) \
 187         skb_share_check_debug(_skb, _pri, __func__, __LINE__)
 188 #define kfree_skb_fast(_skb) \
 189         kfree_skb_fast_debug(_skb, __func__, __LINE__)
 190 #define skb_realloc_headroom(_skb, _headroom) \
 191         skb_realloc_headroom_debug(_skb, _headroom, __func__, __LINE__)
 192 #define pskb_copy(_skb, _pri) \
 193         pskb_copy_debug(_skb, _pri, __func__, __LINE__)
 194 #define skb_get(_skb) \
 195         skb_get_debug(_skb, __func__, __LINE__)
 196 #define skb_copy(_skb, _pri) \
 197         skb_copy_debug(_skb, _pri, __func__, __LINE__)
 198 #define dev_queue_xmit(_skb) \
 199         dev_queue_xmit_debug(_skb, __func__, __LINE__)
 200 #endif /* #ifdef IEEE80211_DEBUG_REFCNT */
 201
 202 #endif /* _NET80211_IEEE80211_SKB_H_ */
 203