Commit e14296ca authored by Bruno Randolf's avatar Bruno Randolf Committed by John W. Linville
Browse files

ath5k: add notes about rx timestamp



add comments about the fact that we don't know when exactly the atheros
hardware takes the RX timestamp.

drivers/net/wireless/ath5k/base.c:      Changes-licensed-under: 3-Clause-BSD
Signed-off-by: default avatarBruno Randolf <bruno@thinktube.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent b47f407b
......@@ -1844,6 +1844,17 @@ accept:
* 15bit only. that means TSF extension has to be done within
* 32768usec (about 32ms). it might be necessary to move this to
* the interrupt handler, like it is done in madwifi.
*
* Unfortunately we don't know when the hardware takes the rx
* timestamp (beginning of phy frame, data frame, end of rx?).
* The only thing we know is that it is hardware specific...
* On AR5213 it seems the rx timestamp is at the end of the
* frame, but i'm not sure.
*
* NOTE: mac80211 defines mactime at the beginning of the first
* data symbol. Since we don't have any time references it's
* impossible to comply to that. This affects IBSS merge only
* right now, so it's not too bad...
*/
rxs.mactime = ath5k_extend_tsf(sc->ah, rs.rs_tstamp);
rxs.flag |= RX_FLAG_TSFT;
......
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