linux_dsm_epyc7002/net/mac80211
Jouni Malinen 9c1c98a3bb mac80211: Send EAPOL frames at lowest rate
The current minstrel_ht rate control behavior is somewhat optimistic in
trying to find optimum TX rate. While this is usually fine for normal
Data frames, there are cases where a more conservative set of retry
parameters would be beneficial to make the connection more robust.

EAPOL frames are critical to the authentication and especially the
EAPOL-Key message 4/4 (the last message in the 4-way handshake) is
important to get through to the AP. If that message is lost, the only
recovery mechanism in many cases is to reassociate with the AP and start
from scratch. This can often be avoided by trying to send the frame with
more conservative rate and/or with more link layer retries.

In most cases, minstrel_ht is currently using the initial EAPOL-Key
frames for probing higher rates and this results in only five link layer
transmission attempts (one at high(ish) MCS and four at MCS0). While
this works with most APs, it looks like there are some deployed APs that
may have issues with the EAPOL frames using HT MCS immediately after
association. Similarly, there may be issues in cases where the signal
strength or radio environment is not good enough to be able to get
frames through even at couple of MCS 0 tries.

The best approach for this would likely to be to reduce the TX rate for
the last rate (3rd rate parameter in the set) to a low basic rate (say,
6 Mbps on 5 GHz and 2 or 5.5 Mbps on 2.4 GHz), but doing that cleanly
requires some more effort. For now, we can start with a simple one-liner
that forces the minimum rate to be used for EAPOL frames similarly how
the TX rate is selected for the IEEE 802.11 Management frames. This does
result in a small extra latency added to the cases where the AP would be
able to receive the higher rate, but taken into account how small number
of EAPOL frames are used, this is likely to be insignificant. A future
optimization in the minstrel_ht design can also allow this patch to be
reverted to get back to the more optimized initial TX rate.

It should also be noted that many drivers that do not use minstrel as
the rate control algorithm are already doing similar workarounds by
forcing the lowest TX rate to be used for EAPOL frames.

Cc: stable@vger.kernel.org
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Tested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2015-02-26 21:03:06 +01:00
..
aes_ccm.c mac80111: Add CCMP-256 cipher 2015-01-27 11:07:35 +01:00
aes_ccm.h mac80111: Add CCMP-256 cipher 2015-01-27 11:07:35 +01:00
aes_cmac.c mac80111: Add BIP-CMAC-256 cipher 2015-01-27 11:09:13 +01:00
aes_cmac.h mac80111: Add BIP-CMAC-256 cipher 2015-01-27 11:09:13 +01:00
aes_gcm.c mac80111: Add GCMP and GCMP-256 ciphers 2015-01-27 11:06:09 +01:00
aes_gcm.h mac80111: Add GCMP and GCMP-256 ciphers 2015-01-27 11:06:09 +01:00
aes_gmac.c mac80111: Add BIP-GMAC-128 and BIP-GMAC-256 ciphers 2015-01-27 11:10:13 +01:00
aes_gmac.h mac80111: Add BIP-GMAC-128 and BIP-GMAC-256 ciphers 2015-01-27 11:10:13 +01:00
agg-rx.c mac80211: fix offloaded BA session traffic after hw restart 2014-09-03 13:40:38 +02:00
agg-tx.c mac80211: synchronously reserve TID per station 2014-11-19 18:45:36 +01:00
cfg.c mac80111: Add BIP-GMAC-128 and BIP-GMAC-256 ciphers 2015-01-27 11:10:13 +01:00
cfg.h mac80211: make cfg80211 ops and privid const 2014-02-04 21:48:21 +01:00
chan.c mac80211: clear sdata->radar_required 2015-02-24 10:51:06 +01:00
debug.h mac80211: 802.11p OCB mode support 2014-11-04 13:18:21 +01:00
debugfs_key.c mac80111: Add BIP-GMAC-128 and BIP-GMAC-256 ciphers 2015-01-27 11:10:13 +01:00
debugfs_key.h
debugfs_netdev.c mac80211: replace SMPS hw flags with wiphy feature bits 2014-09-11 13:37:02 +02:00
debugfs_netdev.h mac80211: fix some missing includes 2014-04-09 14:49:43 +02:00
debugfs_sta.c mac80211: introduce TDLS channel switch ops 2014-11-19 18:45:21 +01:00
debugfs_sta.h
debugfs.c mac80211: move U-APSD enablement to vif flags 2014-12-15 12:34:45 +01:00
debugfs.h mac80211: fix some missing includes 2014-04-09 14:49:43 +02:00
driver-ops.h mac80211: allow drivers to provide most station statistics 2015-01-08 15:28:06 +01:00
ethtool.c cfg80211: remove enum station_info_flags 2015-01-08 15:28:10 +01:00
event.c
ht.c mac80211: set Rx highest rate in ht_cap 2014-07-21 12:14:04 +02:00
ibss.c mac80211: notify NSS changed when IBSS and HT 2014-12-17 11:47:26 +01:00
ieee80211_i.h mac80211: handle potential race between suspend and scan completion 2015-01-27 09:58:46 +01:00
iface.c mac80211: avoid races related to suspend flow 2015-01-23 10:54:22 +01:00
Kconfig mac80111: Add GCMP and GCMP-256 ciphers 2015-01-27 11:06:09 +01:00
key.c mac80111: Add BIP-GMAC-128 and BIP-GMAC-256 ciphers 2015-01-27 11:10:13 +01:00
key.h mac80111: Add BIP-GMAC-128 and BIP-GMAC-256 ciphers 2015-01-27 11:10:13 +01:00
led.c mac80211: use oneshot blink API for LED triggers 2013-08-01 10:48:49 +02:00
led.h mac80211: use oneshot blink API for LED triggers 2013-08-01 10:48:49 +02:00
main.c mac80111: Add BIP-GMAC-128 and BIP-GMAC-256 ciphers 2015-01-27 11:10:13 +01:00
Makefile mac80111: Add BIP-GMAC-128 and BIP-GMAC-256 ciphers 2015-01-27 11:10:13 +01:00
mesh_hwmp.c mac80211: remove unnecessary break after return 2014-07-15 16:27:00 -07:00
mesh_pathtbl.c mac80211: implement cfg80211_ops to query mesh proxy path table 2014-10-09 11:19:07 +02:00
mesh_plink.c Revert "mac80211: keep sending peer candidate events while in listen state" 2015-01-23 10:57:19 +01:00
mesh_ps.c mac80211: clear sequence/fragment number in QoS-null frames 2014-03-05 15:49:54 +01:00
mesh_sync.c mac80211: remove BUG_ON usage 2014-04-29 17:59:27 +02:00
mesh.c mac80211: use secondary channel offset IE also beacons during CSA 2014-10-29 16:37:45 +01:00
mesh.h mac80211: implement cfg80211_ops to query mesh proxy path table 2014-10-09 11:19:07 +02:00
michael.c
michael.h mac80211: fix some missing includes 2014-04-09 14:49:43 +02:00
mlme.c Last round of updates for net-next: 2015-02-04 14:57:45 -08:00
ocb.c mac80211: 802.11p OCB mode support 2014-11-04 13:18:21 +01:00
offchannel.c mac80211: let flush() drop packets when possible 2015-01-14 09:31:18 +01:00
pm.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-01-27 16:59:56 -08:00
rate.c mac80211: add more missing checks for VHT tx rates 2014-11-28 14:24:23 +01:00
rate.h mac80211: add ieee80211_tx_status_noskb 2014-11-28 15:01:51 +01:00
rc80211_minstrel_debugfs.c mac80211: minstrels: fix buffer overflow in HT debugfs rc_stats 2014-10-20 16:37:01 +02:00
rc80211_minstrel_ht_debugfs.c mac80211: minstrel_ht: use group flags instead of index to display rates 2014-10-23 20:36:13 +02:00
rc80211_minstrel_ht.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless 2014-12-08 13:58:58 -05:00
rc80211_minstrel_ht.h mac80211: minstrel_ht: add basic support for VHT rates <= 3SS@80MHz 2014-10-21 13:25:26 +02:00
rc80211_minstrel.c mac80211/minstrel: fix !x!=0 confusion 2015-02-24 21:12:07 +01:00
rc80211_minstrel.h mac80211: minstrel: reduce size of struct minstrel_rate_stats 2014-12-19 21:34:22 +01:00
rx.c Last round of updates for net-next: 2015-02-04 14:57:45 -08:00
scan.c mac80211: complete scan work immediately if quiesced or suspended 2015-01-23 10:54:22 +01:00
spectmgmt.c mac80211: remove unused variable in ieee80211_parse_ch_switch_ie() 2014-12-17 15:45:17 +01:00
sta_info.c mac80211: support beacon statistics 2015-01-23 15:51:38 +01:00
sta_info.h mac80211: provide per-TID RX/TX MSDU counters 2015-01-08 15:28:20 +01:00
status.c mac80211: remove doubled semicolon 2015-01-16 13:27:56 +01:00
tdls.c mac80211: tdls: disentangle HT supported conditions 2015-01-23 11:42:14 +01:00
tkip.c mac80211: fix checkpatch errors 2013-12-18 10:33:06 +01:00
tkip.h
trace.c
trace.h mac80211: allow drivers to provide most station statistics 2015-01-08 15:28:06 +01:00
tx.c mac80211: Send EAPOL frames at lowest rate 2015-02-26 21:03:06 +01:00
util.c mac80211: handle potential race between suspend and scan completion 2015-01-27 09:58:46 +01:00
vht.c mac80211: update sta bw on ht chanwidth action frame 2014-12-17 15:45:16 +01:00
wep.c mac80211: fix network header breakage during encryption 2014-10-23 20:40:01 +02:00
wep.h
wme.c mac80211: synchronously reserve TID per station 2014-11-19 18:45:36 +01:00
wme.h mac80211: add WMM admission control support 2014-10-22 10:42:09 +02:00
wpa.c mac80111: Add BIP-GMAC-128 and BIP-GMAC-256 ciphers 2015-01-27 11:10:13 +01:00
wpa.h mac80111: Add BIP-GMAC-128 and BIP-GMAC-256 ciphers 2015-01-27 11:10:13 +01:00