| Message ID | 20211104010548.1107405-2-benl@squareup.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | wcn36xx: populate band before determining rate on RX | expand |
On Thu, 4 Nov 2021 at 02:05, Benjamin Li <benl@squareup.com> wrote: > > status.band is used in determination of status.rate -- for 5GHz on legacy > rates there is a linear shift between the BD descriptor's rate field and > the wcn36xx driver's rate table (wcn_5ghz_rates). > > We have a special clause to populate status.band for hardware scan offload > frames. However, this block occurs after status.rate is already populated. > Correctly handle this dependency by moving the band block before the rate > block. > > This patch addresses kernel warnings & missing scan results for 5GHz APs > that send their beacons/probe responses at the higher four legacy rates > (24-54 Mbps), when using hardware scan offload: > > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 0 at net/mac80211/rx.c:4532 ieee80211_rx_napi+0x744/0x8d8 > Modules linked in: wcn36xx [...] > CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 4.19.107-g73909fa #1 > Hardware name: Square, Inc. T2 (all variants) (DT) > Call trace: > dump_backtrace+0x0/0x148 > show_stack+0x14/0x1c > dump_stack+0xb8/0xf0 > __warn+0x2ac/0x2d8 > warn_slowpath_null+0x44/0x54 > ieee80211_rx_napi+0x744/0x8d8 > ieee80211_tasklet_handler+0xa4/0xe0 > tasklet_action_common+0xe0/0x118 > tasklet_action+0x20/0x28 > __do_softirq+0x108/0x1ec > irq_exit+0xd4/0xd8 > __handle_domain_irq+0x84/0xbc > gic_handle_irq+0x4c/0xb8 > el1_irq+0xe8/0x190 > lpm_cpuidle_enter+0x220/0x260 > cpuidle_enter_state+0x114/0x1c0 > cpuidle_enter+0x34/0x48 > do_idle+0x150/0x268 > cpu_startup_entry+0x20/0x24 > rest_init+0xd4/0xe0 > start_kernel+0x398/0x430 > ---[ end trace ae28cb759352b403 ]--- > > Fixes: 8a27ca394782 ("wcn36xx: Correct band/freq reporting on RX") > Signed-off-by: Benjamin Li <benl@squareup.com> Tested-by: Loic Poulain <loic.poulain@linaro.org>
Benjamin Li <benl@squareup.com> wrote: > status.band is used in determination of status.rate -- for 5GHz on legacy > rates there is a linear shift between the BD descriptor's rate field and > the wcn36xx driver's rate table (wcn_5ghz_rates). > > We have a special clause to populate status.band for hardware scan offload > frames. However, this block occurs after status.rate is already populated. > Correctly handle this dependency by moving the band block before the rate > block. > > This patch addresses kernel warnings & missing scan results for 5GHz APs > that send their beacons/probe responses at the higher four legacy rates > (24-54 Mbps), when using hardware scan offload: > > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 0 at net/mac80211/rx.c:4532 ieee80211_rx_napi+0x744/0x8d8 > Modules linked in: wcn36xx [...] > CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 4.19.107-g73909fa #1 > Hardware name: Square, Inc. T2 (all variants) (DT) > Call trace: > dump_backtrace+0x0/0x148 > show_stack+0x14/0x1c > dump_stack+0xb8/0xf0 > __warn+0x2ac/0x2d8 > warn_slowpath_null+0x44/0x54 > ieee80211_rx_napi+0x744/0x8d8 > ieee80211_tasklet_handler+0xa4/0xe0 > tasklet_action_common+0xe0/0x118 > tasklet_action+0x20/0x28 > __do_softirq+0x108/0x1ec > irq_exit+0xd4/0xd8 > __handle_domain_irq+0x84/0xbc > gic_handle_irq+0x4c/0xb8 > el1_irq+0xe8/0x190 > lpm_cpuidle_enter+0x220/0x260 > cpuidle_enter_state+0x114/0x1c0 > cpuidle_enter+0x34/0x48 > do_idle+0x150/0x268 > cpu_startup_entry+0x20/0x24 > rest_init+0xd4/0xe0 > start_kernel+0x398/0x430 > ---[ end trace ae28cb759352b403 ]--- > > Fixes: 8a27ca394782 ("wcn36xx: Correct band/freq reporting on RX") > Signed-off-by: Benjamin Li <benl@squareup.com> > Tested-by: Loic Poulain <loic.poulain@linaro.org> > Signed-off-by: Kalle Valo <kvalo@codeaurora.org> 2 patches applied to ath-next branch of ath.git, thanks. c9c5608fafe4 wcn36xx: populate band before determining rate on RX cfdf6b19e750 wcn36xx: fix RX BD rate mapping for 5GHz legacy rates
diff --git a/drivers/net/wireless/ath/wcn36xx/txrx.c b/drivers/net/wireless/ath/wcn36xx/txrx.c index 75951ccbc840e..f0a9f069a92a9 100644 --- a/drivers/net/wireless/ath/wcn36xx/txrx.c +++ b/drivers/net/wireless/ath/wcn36xx/txrx.c @@ -314,8 +314,6 @@ int wcn36xx_rx_skb(struct wcn36xx *wcn, struct sk_buff *skb) fc = __le16_to_cpu(hdr->frame_control); sn = IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)); - status.freq = WCN36XX_CENTER_FREQ(wcn); - status.band = WCN36XX_BAND(wcn); status.mactime = 10; status.signal = -get_rssi0(bd); status.antenna = 1; @@ -327,6 +325,25 @@ int wcn36xx_rx_skb(struct wcn36xx *wcn, struct sk_buff *skb) wcn36xx_dbg(WCN36XX_DBG_RX, "status.flags=%x\n", status.flag); + if (bd->scan_learn) { + /* If packet originate from hardware scanning, extract the + * band/channel from bd descriptor. + */ + u8 hwch = (bd->reserved0 << 4) + bd->rx_ch; + + if (bd->rf_band != 1 && hwch <= sizeof(ab_rx_ch_map) && hwch >= 1) { + status.band = NL80211_BAND_5GHZ; + status.freq = ieee80211_channel_to_frequency(ab_rx_ch_map[hwch - 1], + status.band); + } else { + status.band = NL80211_BAND_2GHZ; + status.freq = ieee80211_channel_to_frequency(hwch, status.band); + } + } else { + status.band = WCN36XX_BAND(wcn); + status.freq = WCN36XX_CENTER_FREQ(wcn); + } + if (bd->rate_id < ARRAY_SIZE(wcn36xx_rate_table)) { rate = &wcn36xx_rate_table[bd->rate_id]; status.encoding = rate->encoding; @@ -353,22 +370,6 @@ int wcn36xx_rx_skb(struct wcn36xx *wcn, struct sk_buff *skb) ieee80211_is_probe_resp(hdr->frame_control)) status.boottime_ns = ktime_get_boottime_ns(); - if (bd->scan_learn) { - /* If packet originates from hardware scanning, extract the - * band/channel from bd descriptor. - */ - u8 hwch = (bd->reserved0 << 4) + bd->rx_ch; - - if (bd->rf_band != 1 && hwch <= sizeof(ab_rx_ch_map) && hwch >= 1) { - status.band = NL80211_BAND_5GHZ; - status.freq = ieee80211_channel_to_frequency(ab_rx_ch_map[hwch - 1], - status.band); - } else { - status.band = NL80211_BAND_2GHZ; - status.freq = ieee80211_channel_to_frequency(hwch, status.band); - } - } - memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status)); if (ieee80211_is_beacon(hdr->frame_control)) {
status.band is used in determination of status.rate -- for 5GHz on legacy rates there is a linear shift between the BD descriptor's rate field and the wcn36xx driver's rate table (wcn_5ghz_rates). We have a special clause to populate status.band for hardware scan offload frames. However, this block occurs after status.rate is already populated. Correctly handle this dependency by moving the band block before the rate block. This patch addresses kernel warnings & missing scan results for 5GHz APs that send their beacons/probe responses at the higher four legacy rates (24-54 Mbps), when using hardware scan offload: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 0 at net/mac80211/rx.c:4532 ieee80211_rx_napi+0x744/0x8d8 Modules linked in: wcn36xx [...] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 4.19.107-g73909fa #1 Hardware name: Square, Inc. T2 (all variants) (DT) Call trace: dump_backtrace+0x0/0x148 show_stack+0x14/0x1c dump_stack+0xb8/0xf0 __warn+0x2ac/0x2d8 warn_slowpath_null+0x44/0x54 ieee80211_rx_napi+0x744/0x8d8 ieee80211_tasklet_handler+0xa4/0xe0 tasklet_action_common+0xe0/0x118 tasklet_action+0x20/0x28 __do_softirq+0x108/0x1ec irq_exit+0xd4/0xd8 __handle_domain_irq+0x84/0xbc gic_handle_irq+0x4c/0xb8 el1_irq+0xe8/0x190 lpm_cpuidle_enter+0x220/0x260 cpuidle_enter_state+0x114/0x1c0 cpuidle_enter+0x34/0x48 do_idle+0x150/0x268 cpu_startup_entry+0x20/0x24 rest_init+0xd4/0xe0 start_kernel+0x398/0x430 ---[ end trace ae28cb759352b403 ]--- Fixes: 8a27ca394782 ("wcn36xx: Correct band/freq reporting on RX") Signed-off-by: Benjamin Li <benl@squareup.com> --- drivers/net/wireless/ath/wcn36xx/txrx.c | 37 +++++++++++++------------ 1 file changed, 19 insertions(+), 18 deletions(-)