diff options
| author | Bruno Randolf <bruno@thinktube.com> | 2008-03-05 18:36:05 +0900 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2008-03-07 16:07:50 -0500 |
| commit | e14296cabac60806606b4ebc1a83ee4697876346 (patch) | |
| tree | 98522cb54c0f43d3803dfcec9747757e8827d2b2 | |
| parent | b47f407bef0d5349dacf65cd3560a976609d4b45 (diff) | |
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: Bruno Randolf <bruno@thinktube.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
| -rw-r--r-- | drivers/net/wireless/ath5k/base.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath5k/base.c b/drivers/net/wireless/ath5k/base.c index 73e7e613a3c..5eacc7cdd9e 100644 --- a/drivers/net/wireless/ath5k/base.c +++ b/drivers/net/wireless/ath5k/base.c @@ -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; |