On Fri, 2018-06-08 at 11:32 -0700, Ryan Hsu wrote:
> In the case of Station connects to AP with narrower bandwidth at
> beginning.
> And later the AP changes the bandwidth to winder bandwidth, the AP
> will
> beacon with wider bandwidth IE, eg VHT20->VHT40->VHT80 or VHT40-
> >VHT80.
>
> Since the supported BANDWIDTH will be limited by the PHYMODE, so
> while
> Station receives the bandwidth change request, it will also need to
> reconfigure the PHYMODE setting to firmware instead of just
> configuring
> the BANDWIDTH info, otherwise it'll trigger a firmware crash with
> non-support bandwidth.
>
> The issue was observed in WLAN.RM.4.4.1-00051-QCARMSWP-1, QCA6174
> with
> below scenario.
> ---
> AP xxx changed bandwidth, new config is 5200 MHz, width 2 (5190/0
> MHz)
> disconnect from AP xxx for new auth to yyy
> RX ReassocResp from xxx (capab=0x1111 status=0 aid=102)
> associated
>
> ....
>
> AP xxx changed bandwidth, new config is 5200 MHz, width 2 (5190/0
> MHz)
> AP xxx changed bandwidth, new config is 5200 MHz, width 3 (5210/0
> MHz)
>
> ....
>
> firmware register dump:
> [00]: 0x05030000 0x000015B3 0x00987291 0x00955B31
> [04]: 0x00987291 0x00060730 0x00000004 0x00000001
> [08]: 0x004089F0 0x00955A00 0x000A0B00 0x00400000
> [12]: 0x00000009 0x00000000 0x00952CD0 0x00952CE6
> [16]: 0x00952CC4 0x0098E25F 0x00000000 0x0091080D
> [20]: 0x40987291 0x0040E7A8 0x00000000 0x0041EE3C
> [24]: 0x809ABF05 0x0040E808 0x00000000 0xC0987291
> [28]: 0x809A650C 0x0040E948 0x0041FE40 0x004345C4
> [32]: 0x809A5C63 0x0040E988 0x0040E9AC 0x0042D1A8
> [36]: 0x8091D252 0x0040E9A8 0x00000002 0x00000001
> [40]: 0x809FDA9D 0x0040EA58 0x0043D554 0x0042D554
> [44]: 0x809F8B22 0x0040EA78 0x0043D554 0x00000001
> [48]: 0x80911210 0x0040EAC8 0x00000010 0x004041D0
> [52]: 0x80911154 0x0040EB28 0x00400000 0x00000000
> [56]: 0x8091122D 0x0040EB48 0x00000000 0x00400600
> --
>
> Reported-by: Rouven Czerwinski <rou...@czerwinskis.de>
> Signed-off-by: Ryan Hsu <ryan...@codeaurora.org>
> ---
> drivers/net/wireless/ath/ath10k/mac.c | 16 ++++++++++++++--
> drivers/net/wireless/ath/ath10k/wmi.h | 1 +
> 2 files changed, 15 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath10k/mac.c
> b/drivers/net/wireless/ath/ath10k/mac.c
> index e9c2fb3..836e0a4 100644
> --- a/drivers/net/wireless/ath/ath10k/mac.c
> +++ b/drivers/net/wireless/ath/ath10k/mac.c
> @@ -6058,8 +6058,19 @@ static void ath10k_sta_rc_update_wk(struct
> work_struct *wk)
> ath10k_mac_max_vht_nss(vht_mcs_mask)));
>
> if (changed & IEEE80211_RC_BW_CHANGED) {
> - ath10k_dbg(ar, ATH10K_DBG_MAC, "mac update sta %pM
> peer bw %d\n",
> - sta->addr, bw);
> + enum wmi_phy_mode mode;
> +
> + mode = chan_to_phymode(&def);
> + ath10k_dbg(ar, ATH10K_DBG_MAC, "mac update sta %pM
> peer bw %d phymode %d\n",
> + sta->addr, bw, mode);
> +
> + err = ath10k_wmi_peer_set_param(ar, arvif->vdev_id,
> sta->addr,
> + WMI_PEER_PHYMODE, mode);
> + if (err) {
> + ath10k_warn(ar, "failed to update STA %pM
> peer phymode %d: %d\n",
> + sta->addr, mode, err);
> + goto exit;
> + }
>
> err = ath10k_wmi_peer_set_param(ar, arvif->vdev_id,
> sta->addr,
> WMI_PEER_CHAN_WIDTH,
> bw);
> @@ -6100,6 +6111,7 @@ static void ath10k_sta_rc_update_wk(struct
> work_struct *wk)
> sta->addr);
> }
>
> +exit:
> mutex_unlock(&ar->conf_mutex);
> }
>
> diff --git a/drivers/net/wireless/ath/ath10k/wmi.h
> b/drivers/net/wireless/ath/ath10k/wmi.h
> index b48db54..d68afb6 100644
> --- a/drivers/net/wireless/ath/ath10k/wmi.h
> +++ b/drivers/net/wireless/ath/ath10k/wmi.h
> @@ -6144,6 +6144,7 @@ enum wmi_peer_param {
> WMI_PEER_NSS = 0x5,
> WMI_PEER_USE_4ADDR = 0x6,
> WMI_PEER_DEBUG = 0xa,
> + WMI_PEER_PHYMODE = 0xd,
> WMI_PEER_DUMMY_VAR = 0xff, /* dummy parameter for STA PS
> workaround */
> };
>
Hi,
I can confirm that this patch works on my machine, and prevents the
crash previously caused by changing the bandwidth. Can it be accepted,
or is there anything I can help with, to get it accepted?
Thanks,
Tim
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