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  1. 19 Jan, 2019 3 commits
    • Toke Høiland-Jørgensen's avatar
      mac80211: Add airtime accounting and scheduling to TXQs · b4809e94
      Toke Høiland-Jørgensen authored 
      This adds airtime accounting and scheduling to the mac80211 TXQ
scheduler. A new callback, ieee80211_sta_register_airtime(), is added
that drivers can call to report airtime usage for stations.

When airtime information is present, mac80211 will schedule TXQs
(through ieee80211_next_txq()) in a way that enforces airtime fairness
between active stations. This scheduling works the same way as the ath9k
in-driver airtime fairness scheduling. If no airtime usage is reported
by the driver, the scheduler will default to round-robin scheduling.

For drivers that don't control TXQ scheduling in software, a new API
function, ieee80211_txq_may_transmit(), is added which the driver can use
to check if the TXQ is eligible for transmission, or should be throttled to
enforce fairness. Calls to this function must also be enclosed in
ieee80211_txq_schedule_{start,end}() calls to ensure proper locking.

The API ieee80211_txq_may_transmit() also ensures that TXQ list will be
aligned aginst driver's own round-robin scheduler list. i.e it rotates
the TXQ list till it makes the requested node becomes the first entry
in TXQ list. Thus both the TXQ list and driver's list are in sync.
Co-developed-by: default avatarRajkumar Manoharan <rmanohar@codeaurora.org>
Signed-off-by: default avatarLouie Lu <git@louie.lu>
[added debugfs write op to reset airtime counter]
Signed-off-by: default avatarToke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: default avatarRajkumar Manoharan <rmanohar@codeaurora.org>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      b4809e94
    • Toke Høiland-Jørgensen's avatar
      cfg80211: Add airtime statistics and settings · 36647055
      Toke Høiland-Jørgensen authored 
      This adds TX airtime statistics to the cfg80211 station dump (to go along
with the RX info already present), and adds a new parameter to set the
airtime weight of each station. The latter allows userspace to implement
policies for different stations by varying their weights.
Signed-off-by: default avatarToke Høiland-Jørgensen <toke@toke.dk>
[rmanohar@codeaurora.org: fixed checkpatch warnings]
Signed-off-by: default avatarRajkumar Manoharan <rmanohar@codeaurora.org>
[move airtime weight != 0 check into policy]
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      36647055
    • Toke Høiland-Jørgensen's avatar
      mac80211: Add TXQ scheduling API · 18667600
      Toke Høiland-Jørgensen authored 
      This adds an API to mac80211 to handle scheduling of TXQs. The interface
between driver and mac80211 for TXQ handling is changed by adding two new
functions: ieee80211_next_txq(), which will return the next TXQ to schedule
in the current round-robin rotation, and ieee80211_return_txq(), which the
driver uses to indicate that it has finished scheduling a TXQ (which will
then be put back in the scheduling rotation if it isn't empty).

The driver must call ieee80211_txq_schedule_start() at the start of each
scheduling session, and ieee80211_txq_schedule_end() at the end. The API
then guarantees that the same TXQ is not returned twice in the same
session (so a driver can loop on ieee80211_next_txq() without worrying
about breaking the loop.

Usage of the new API is optional, so drivers can be ported one at a time.
In this patch, the actual scheduling performed by mac80211 is simple
round-robin, but a subsequent commit adds airtime fairness awareness to the
scheduler.
Signed-off-by: default avatarToke Høiland-Jørgensen <toke@toke.dk>
[minor kernel-doc fix, propagate sparse locking checks out]
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      18667600
  3. 18 Jan, 2019 37 commits
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