When selecting a network the default behaviour of WPA supplicant is to prefer higher throughput, it does this by capping the SNR. But in certain environments, reliability is important over throughput and choosing a lower SNR (thought it is greater than "Great SNR") might be sub-optimal. Introduce a configuration option to choose the two options (throughput or reliability). Signed-off-by: Chaitanya Tata <Chaitanya.Tata@xxxxxxxxxxxxx> --- wpa_supplicant/Makefile | 4 ++++ wpa_supplicant/defconfig | 11 +++++++++++ wpa_supplicant/scan.h | 10 ++++++++++ 3 files changed, 25 insertions(+) diff --git a/wpa_supplicant/Makefile b/wpa_supplicant/Makefile index ce1c8b2e3..dc3dbf0ca 100644 --- a/wpa_supplicant/Makefile +++ b/wpa_supplicant/Makefile @@ -1877,6 +1877,10 @@ ifdef CONFIG_NO_TKIP CFLAGS += -DCONFIG_NO_TKIP endif +ifdef CONFIG_NW_SEL_RELIABILITY +CFLAGS += -DCONFIG_NW_SEL_RELIABILITY +endif + dynamic_eap_methods: $(EAPDYN) _OBJS_VAR := OBJS_priv diff --git a/wpa_supplicant/defconfig b/wpa_supplicant/defconfig index 708a82385..0b87fb5df 100644 --- a/wpa_supplicant/defconfig +++ b/wpa_supplicant/defconfig @@ -628,3 +628,14 @@ CONFIG_DPP=y # design is still subject to change. As such, this should not yet be enabled in # production use. #CONFIG_PASN=y + +# When selecting a network, prefer networks with a better signal strength +# without any cap a.k.a "Great SNR". +# +# If this is enabled then higher SNR is preferred without any cap over higher band +# (higher throughput) to achieve better reliability. +# +# If this is disabled then for networks with capped SNR, the preference is given +# to the network with higher band (5GHz or 6GHz) and then to the network with +# higher SNR. +#CONFIG_NW_SEL_RELIABILITY=y diff --git a/wpa_supplicant/scan.h b/wpa_supplicant/scan.h index d1780eb09..175dc37ef 100644 --- a/wpa_supplicant/scan.h +++ b/wpa_supplicant/scan.h @@ -18,6 +18,15 @@ #define DEFAULT_NOISE_FLOOR_5GHZ (-92) #define DEFAULT_NOISE_FLOOR_6GHZ (-92) +#ifdef CONFIG_NW_SEL_RELIABILITY +/* + * This basically disables capping the SNR when choosing the best BSS. This + * means that the BSS with the highest SNR will be chosen, independent of the + * band. This is useful for scenarios where reliability is more important than + * throughput. + */ +#define GREAT_SNR 999 +#else /* * Channels with a great SNR can operate at full rate. What is a great SNR? * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general @@ -29,6 +38,7 @@ * somewhat conservative value here. */ #define GREAT_SNR 25 +#endif /* CONFIG_NW_SEL_RELIABILITY */ #define IS_2P4GHZ(n) (n >= 2412 && n <= 2484) #define IS_5GHZ(n) (n > 4000 && n < 5895) -- 2.34.1 _______________________________________________ Hostap mailing list Hostap@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/hostap
