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  1. 01 Apr, 2015 3 commits
    • Thomas Huehn's avatar
      mac80211: enhance readability of Minstrels rc_stats output · e161f7f6
      Thomas Huehn authored 
      This patch restructures the rc_stats debugfs table of Minstrel in
order to achieve better human readability. A new layout of the
statistics and a new header is added. In addition to the old layout
there are two new columns of information added:
idx	- representing the rate index of each rate in mac80211 which
	  can be used to set specific rates as fixed rate via debugfs
airtime - the tx-time in micro seconds that a 1200 Byte packet
	  takes to be transmitted over the air at the given rate

The old layout of rc_stats:

    rate      tpt  eprob *prob ret  *ok(*cum)        ok(      cum)
 DP 1          0.9  93.5 100.0   1    0(   0)         2(        2)
    2          0.4  40.0 100.0   0    0(   0)         4(        10)
    5.5        0.0   0.0   0.0   0    0(   0)         0(        0)
...

is changed into this new layout:

best   _______rate_____    __statistics__    ________last_______    ______sum-of________
rate  [name idx tx-time]  [ ø(tp) ø(prob)]  [prob.|retry|suc|att]  [#success | #attempts]
 DP   1     0     9738      0.9    93.5     100.0   1     1 1             2   2
      2     1     4922      0.4    40.0     100.0   1     0 0             4   10
      5.5   2     1858      0.0     0.0       0.0   2     0 0             0   0
...
Signed-off-by: default avatarThomas Huehn <thomas@net.t-labs.tu-berlin.de>
Signed-off-by: default avatarStefan Venz <ikstream86@gmail.com>
Acked-by: default avatarFelix Fietkau <nbd@openwrt.org>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      e161f7f6
    • Ilan peer's avatar
      cfg80211: Stop calling crda if it is not responsive · c37722bd
      Ilan peer authored 
      Patch eeca9fce (cfg80211: Schedule
timeout for all CRDA call) introduced a regression, where in case
that crda is not installed (or not configured properly etc.), the
regulatory core will needlessly continue to call it, polluting the
log with the following log:

"cfg80211: Calling CRDA to update world regulatory domain"

Fix this by limiting the number of continuous CRDA request failures.
Signed-off-by: default avatarIlan Peer <ilan.peer@intel.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      c37722bd
    • Johannes Berg's avatar
      mac80211: use rhashtable for station table · 7bedd0cf
      Johannes Berg authored 
      We currently have a hand-rolled table with 256 entries and are
using the last byte of the MAC address as the hash. This hash
is obviously very fast, but collisions are easily created and
we waste a lot of space in the common case of just connecting
as a client to an AP where we just have a single station. The
other common case of an AP is also suboptimal due to the size
of the hash table and the ease of causing collisions.

Convert all of this to use rhashtable with jhash, which gives
us the advantage of a far better hash function (with random
perturbation to avoid hash collision attacks) and of course
that the hash table grows and shrinks dynamically with chain
length, improving both cases above.

Use a specialised hash function (using jhash, but with fixed
length) to achieve better compiler optimisation as suggested
by Sergey Ryazanov.
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      7bedd0cf
  3. 31 Mar, 2015 37 commits
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