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iwlegacy: add accidentally removed comments

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Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
This commit is contained in:
Stanislaw Gruszka 2011-11-15 12:57:25 +01:00
parent ccf5533ec4
commit 8f29b456f8
1 changed files with 27 additions and 0 deletions
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27
drivers/net/wireless/iwlegacy/4965-mac.c
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@ -1411,6 +1411,33 @@ void il4965_reply_stats(struct il_priv *il,
il4965_rx_stats(il, rxb);
}
/*
* mac80211 queues, ACs, hardware queues, FIFOs.
*
* Cf. http://wireless.kernel.org/en/developers/Documentation/mac80211/queues
*
* Mac80211 uses the following numbers, which we get as from it
* by way of skb_get_queue_mapping(skb):
*
* VO 0
* VI 1
* BE 2
* BK 3
*
*
* Regular (not A-MPDU) frames are put into hardware queues corresponding
* to the FIFOs, see comments in iwl-prph.h. Aggregated frames get their
* own queue per aggregation session (RA/TID combination), such queues are
* set up to map into FIFOs too, for which we need an AC->FIFO mapping. In
* order to map frames to the right queue, we also need an AC->hw queue
* mapping. This is implemented here.
*
* Due to the way hw queues are set up (by the hw specific modules like
* iwl-4965.c), the AC->hw queue mapping is the identity
* mapping.
*/
static const u8 tid_to_ac[] = {
IEEE80211_AC_BE,
IEEE80211_AC_BK,