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authorBruno Randolf <bruno@thinktube.com>2008-02-18 11:20:51 +0900
committerJohn W. Linville <linville@tuxdriver.com>2008-02-29 15:37:11 -0500
commitc132bec33c2eb5e46d8e4b80cfa5a9656d8e57e7 (patch)
tree3a96d97adcbb4c47a349337a9d3943a54e2f06ce /include/net
parent3230455d13860b26f638b9d58a8c5f20bf32fda2 (diff)
mac80211: better definition of mactime
define mactime as the time when the first data symbol arrived at the HW. the old definition was questionable because 802.11 defines timestamp only for beacon and probe response frames, and there it means the timestamp field. a stricter definition of mactime is necessary for correct merging of IBSS. note that it is up to the driver to convert whatever its hardware returns to this definition. unfortunately we don't know for example when atheros hardware takes its rx timestamp exactly :( Signed-off-by: Bruno Randolf <bruno@thinktube.com> Acked-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/mac80211.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 027d51f876e..1a1d0d8203a 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -295,7 +295,8 @@ enum mac80211_rx_flags {
* The low-level driver should provide this information (the subset
* supported by hardware) to the 802.11 code with each received
* frame.
- * @mactime: MAC timestamp as defined by 802.11
+ * @mactime: value in microseconds of the 64-bit Time Synchronization Function
+ * (TSF) timer when the first data symbol (MPDU) arrived at the hardware.
* @band: the active band when this frame was received
* @freq: frequency the radio was tuned to when receiving this frame, in MHz
* @ssi: signal strength when receiving this frame