1. 14 Mar, 2024 3 commits
  2. 12 Mar, 2024 1 commit
    • Baochen Qiang's avatar
      wifi: ath11k: don't force enable power save on non-running vdevs · 01296b39
      Baochen Qiang authored
      Currently we force enable power save on non-running vdevs, this results
      in unexpected ping latency in below scenarios:
      	1. disable power save from userspace.
      	2. trigger suspend/resume.
      
      With step 1 power save is disabled successfully and we get a good latency:
      
      PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
      64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=5.13 ms
      64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=5.45 ms
      64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=5.99 ms
      64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=6.34 ms
      64 bytes from 192.168.1.1: icmp_seq=5 ttl=64 time=4.47 ms
      64 bytes from 192.168.1.1: icmp_seq=6 ttl=64 time=6.45 ms
      
      While after step 2, the latency becomes much larger:
      
      PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
      64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=17.7 ms
      64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=15.0 ms
      64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=14.3 ms
      64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=16.5 ms
      64 bytes from 192.168.1.1: icmp_seq=5 ttl=64 time=20.1 ms
      
      The reason is, with step 2, power save is force enabled due to vdev not
      running, although mac80211 was trying to disable it to honor userspace
      configuration:
      
      ath11k_pci 0000:03:00.0: wmi cmd sta powersave mode psmode 1 vdev id 0
      Call Trace:
       ath11k_wmi_pdev_set_ps_mode
       ath11k_mac_op_bss_info_changed
       ieee80211_bss_info_change_notify
       ieee80211_reconfig
       ieee80211_resume
       wiphy_resume
      
      This logic is taken from ath10k where it was added due to below comment:
      
      	Firmware doesn't behave nicely and consumes more power than
      	necessary if PS is disabled on a non-started vdev.
      
      However we don't know whether such an issue also occurs to ath11k firmware
      or not. But even if it does, it's not appropriate because it goes against
      userspace, even cfg/mac80211 don't know we have enabled it in fact.
      
      Remove it to fix this issue. In this way we not only get a better latency,
      but also, and the most important, keeps the consistency between userspace
      and kernel/driver. The biggest price for that would be the power consumption,
      which is not that important, compared with the consistency.
      
      Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30
      
      Fixes: b2beffa7 ("ath11k: enable 802.11 power save mode in station mode")
      Signed-off-by: default avatarBaochen Qiang <quic_bqiang@quicinc.com>
      Signed-off-by: default avatarKalle Valo <quic_kvalo@quicinc.com>
      Link: https://msgid.link/20240309113115.11498-1-quic_bqiang@quicinc.com
      01296b39
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