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wireless: move sequence number arithmetic to ieee80211.h

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Move the sequence number arithmetic code from mac80211 to
ieee80211.h so others can use it. Also rename the functions
from _seq to _sn, they operate on the sequence number, not
the sequence_control field.

Also move macros to convert the sequence control to/from
the sequence number value from various drivers.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg
2013-02-15 19:25:00 +01:00
parent b56cf72083
commit 9a886586c8
11 changed files with 66 additions and 61 deletions
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28
include/linux/ieee80211.h
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@@ -113,6 +113,34 @@
#define IEEE80211_CTL_EXT_SSW_FBACK 0x9000
#define IEEE80211_CTL_EXT_SSW_ACK 0xa000
#define IEEE80211_SN_MASK ((IEEE80211_SCTL_SEQ) >> 4)
#define IEEE80211_MAX_SN IEEE80211_SN_MASK
#define IEEE80211_SN_MODULO (IEEE80211_MAX_SN + 1)
static inline int ieee80211_sn_less(u16 sn1, u16 sn2)
{
return ((sn1 - sn2) & IEEE80211_SN_MASK) > (IEEE80211_SN_MODULO >> 1);
}
static inline u16 ieee80211_sn_add(u16 sn1, u16 sn2)
{
return (sn1 + sn2) & IEEE80211_SN_MASK;
}
static inline u16 ieee80211_sn_inc(u16 sn)
{
return ieee80211_sn_add(sn, 1);
}
static inline u16 ieee80211_sn_sub(u16 sn1, u16 sn2)
{
return (sn1 - sn2) & IEEE80211_SN_MASK;
}
#define IEEE80211_SEQ_TO_SN(seq) (((seq) & IEEE80211_SCTL_SEQ) >> 4)
#define IEEE80211_SN_TO_SEQ(ssn) (((ssn) << 4) & IEEE80211_SCTL_SEQ)
/* miscellaneous IEEE 802.11 constants */
#define IEEE80211_MAX_FRAG_THRESHOLD 2352
#define IEEE80211_MAX_RTS_THRESHOLD 2353