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author | Johannes Berg <johannes.berg@intel.com> | 2010-06-10 10:21:50 +0200 |
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committer | John W. Linville <linville@tuxdriver.com> | 2010-06-14 15:39:28 -0400 |
commit | 73a72a81d27b71f9ace31668d2dd7f3ac1c8228e (patch) | |
tree | 114b1a333c53a328d1a55551ea591fe8f3b5d2d7 /net/mac80211/agg-tx.c | |
parent | 85ad181ea78861f69b007599cec9e6ba33fcdf8a (diff) | |
download | linux-73a72a81d27b71f9ace31668d2dd7f3ac1c8228e.tar.gz linux-73a72a81d27b71f9ace31668d2dd7f3ac1c8228e.tar.bz2 linux-73a72a81d27b71f9ace31668d2dd7f3ac1c8228e.zip |
mac80211: update aggregation documentation
Even before the recent changes, the documentation
for TX aggregation was somewhat out of date. Update
it and also add documentation for the RX side.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/agg-tx.c')
-rw-r--r-- | net/mac80211/agg-tx.c | 43 |
1 files changed, 27 insertions, 16 deletions
diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c index 5dff73eebefb..c893f236acea 100644 --- a/net/mac80211/agg-tx.c +++ b/net/mac80211/agg-tx.c @@ -21,28 +21,39 @@ #include "wme.h" /** - * DOC: TX aggregation + * DOC: TX A-MPDU aggregation * * Aggregation on the TX side requires setting the hardware flag - * %IEEE80211_HW_AMPDU_AGGREGATION as well as, if present, the @ampdu_queues - * hardware parameter to the number of hardware AMPDU queues. If there are no - * hardware queues then the driver will (currently) have to do all frame - * buffering. + * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed + * packets with a flag indicating A-MPDU aggregation. The driver + * or device is responsible for actually aggregating the frames, + * as well as deciding how many and which to aggregate. * - * When TX aggregation is started by some subsystem (usually the rate control - * algorithm would be appropriate) by calling the - * ieee80211_start_tx_ba_session() function, the driver will be notified via - * its @ampdu_action function, with the %IEEE80211_AMPDU_TX_START action. + * When TX aggregation is started by some subsystem (usually the rate + * control algorithm would be appropriate) by calling the + * ieee80211_start_tx_ba_session() function, the driver will be + * notified via its @ampdu_action function, with the + * %IEEE80211_AMPDU_TX_START action. * * In response to that, the driver is later required to call the - * ieee80211_start_tx_ba_cb() (or ieee80211_start_tx_ba_cb_irqsafe()) - * function, which will start the aggregation session. + * ieee80211_start_tx_ba_cb_irqsafe() function, which will really + * start the aggregation session after the peer has also responded. + * If the peer responds negatively, the session will be stopped + * again right away. Note that it is possible for the aggregation + * session to be stopped before the driver has indicated that it + * is done setting it up, in which case it must not indicate the + * setup completion. * - * Similarly, when the aggregation session is stopped by - * ieee80211_stop_tx_ba_session(), the driver's @ampdu_action function will - * be called with the action %IEEE80211_AMPDU_TX_STOP. In this case, the - * call must not fail, and the driver must later call ieee80211_stop_tx_ba_cb() - * (or ieee80211_stop_tx_ba_cb_irqsafe()). + * Also note that, since we also need to wait for a response from + * the peer, the driver is notified of the completion of the + * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the + * @ampdu_action callback. + * + * Similarly, when the aggregation session is stopped by the peer + * or something calling ieee80211_stop_tx_ba_session(), the driver's + * @ampdu_action function will be called with the action + * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail, + * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe(). */ static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |