From 8b4d2f080afbd4280ecca0f4b3ceea943a7a86d0 Mon Sep 17 00:00:00 2001 From: Manikanta Pubbisetty Date: Thu, 23 Mar 2023 11:39:13 +0530 Subject: [PATCH] wifi: ath11k: Optimize 6 GHz scan time Currently, time taken to scan all supported channels on WCN6750 is ~8 seconds and connection time is almost 10 seconds. WCN6750 supports three Wi-Fi bands (i.e., 2.4/5/6 GHz) and the numbers of channels for scan come around ~100 channels (default case). Since the chip doesn't have support for DBS (Dual Band Simultaneous), scans cannot be parallelized resulting in longer scan times. Among the 100 odd channels, ~60 channels are in 6 GHz band. Therefore, optimizing the scan for 6 GHz channels will bring down the overall scan time. WCN6750 firmware has support to scan a 6 GHz channel based on co-located AP information i.e., RNR IE which is found in the legacy 2.4/5 GHz scan results. When a scan request with all supported channel list is enqueued to the firmware, then based on WMI_SCAN_CHAN_FLAG_SCAN_ONLY_IF_RNR_FOUND scan channel flag, firmware will scan only those 6 GHz channels for which RNR IEs are found in the legacy scan results. In the proposed design, based on NL80211_SCAN_FLAG_COLOCATED_6GHZ scan flag, driver will set the WMI_SCAN_CHAN_FLAG_SCAN_ONLY_IF_RNR_FOUND flag for non-PSC channels. Since there is high probability to find 6 GHz APs on PSC channels, these channels are always scanned. Only non-PSC channels are selectively scanned based on cached RNR information from the legacy scan results. If NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set in the scan flags, then scan will happen on all supported channels (default behavior). With these optimizations, scan time is improved by 1.5-1.8 seconds on WCN6750. Similar savings have been observed on WCN6855. Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.1.0.1-00887-QCAMSLSWPLZ-1 Tested-on: WCN6855 hw2.1 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.16 Signed-off-by: Manikanta Pubbisetty Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20230323060913.10097-1-quic_mpubbise@quicinc.com --- drivers/net/wireless/ath/ath11k/mac.c | 25 +++++++++++++++++++++++-- drivers/net/wireless/ath/ath11k/wmi.h | 4 ++++ 2 files changed, 27 insertions(+), 2 deletions(-) --- a/drivers/net/wireless/ath/ath11k/mac.c +++ b/drivers/net/wireless/ath/ath11k/mac.c @@ -3819,8 +3819,29 @@ static int ath11k_mac_op_hw_scan(struct goto exit; } - for (i = 0; i < arg->num_chan; i++) - arg->chan_list[i] = req->channels[i]->center_freq; + for (i = 0; i < arg->num_chan; i++) { + if (test_bit(WMI_TLV_SERVICE_SCAN_CONFIG_PER_CHANNEL, + ar->ab->wmi_ab.svc_map)) { + arg->chan_list[i] = + u32_encode_bits(req->channels[i]->center_freq, + WMI_SCAN_CONFIG_PER_CHANNEL_MASK); + + /* If NL80211_SCAN_FLAG_COLOCATED_6GHZ is set in scan + * flags, then scan all PSC channels in 6 GHz band and + * those non-PSC channels where RNR IE is found during + * the legacy 2.4/5 GHz scan. + * If NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set, + * then all channels in 6 GHz will be scanned. + */ + if (req->channels[i]->band == NL80211_BAND_6GHZ && + req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ && + !cfg80211_channel_is_psc(req->channels[i])) + arg->chan_list[i] |= + WMI_SCAN_CH_FLAG_SCAN_ONLY_IF_RNR_FOUND; + } else { + arg->chan_list[i] = req->channels[i]->center_freq; + } + } } if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) { --- a/drivers/net/wireless/ath/ath11k/wmi.h +++ b/drivers/net/wireless/ath/ath11k/wmi.h @@ -2100,6 +2100,7 @@ enum wmi_tlv_service { /* The second 128 bits */ WMI_MAX_EXT_SERVICE = 256, + WMI_TLV_SERVICE_SCAN_CONFIG_PER_CHANNEL = 265, WMI_TLV_SERVICE_REG_CC_EXT_EVENT_SUPPORT = 281, WMI_TLV_SERVICE_BIOS_SAR_SUPPORT = 326, @@ -3249,6 +3250,9 @@ struct wmi_start_scan_cmd { #define WMI_SCAN_DWELL_MODE_SHIFT 21 #define WMI_SCAN_FLAG_EXT_PASSIVE_SCAN_START_TIME_ENHANCE 0x00000800 +#define WMI_SCAN_CONFIG_PER_CHANNEL_MASK GENMASK(19, 0) +#define WMI_SCAN_CH_FLAG_SCAN_ONLY_IF_RNR_FOUND BIT(20) + enum { WMI_SCAN_DWELL_MODE_DEFAULT = 0, WMI_SCAN_DWELL_MODE_CONSERVATIVE = 1,