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author | Stanislaw Gruszka <sgruszka@redhat.com> | 2011-11-15 11:57:25 (GMT) |
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committer | Stanislaw Gruszka <sgruszka@redhat.com> | 2011-11-15 11:57:25 (GMT) |
commit | 8f29b456f8b2c560819f698b82ef2efc09ac47c5 (patch) | |
tree | 4bf946987721e11ba05ea1a7cc7b4138ab7ea7b6 /drivers/net/wireless/iwlegacy/4965-mac.c | |
parent | ccf5533ec4cdf792ec17c375b1186cfed4086f2a (diff) | |
download | linux-fsl-qoriq-8f29b456f8b2c560819f698b82ef2efc09ac47c5.tar.xz |
iwlegacy: add accidentally removed comments
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Diffstat (limited to 'drivers/net/wireless/iwlegacy/4965-mac.c')
-rw-r--r-- | drivers/net/wireless/iwlegacy/4965-mac.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlegacy/4965-mac.c b/drivers/net/wireless/iwlegacy/4965-mac.c index d817d8d..a8a6461 100644 --- a/drivers/net/wireless/iwlegacy/4965-mac.c +++ b/drivers/net/wireless/iwlegacy/4965-mac.c @@ -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, |