ath10k: provide a build variant for small RAM devices

package/kernel/mac80211/Makefile

@@ -443,9 +443,15 @@ config-$(call config_package,rsi91x-sdio) += RSI_SDIO
 
 config-$(CONFIG_LEDS_TRIGGERS) += MAC80211_LEDS
 
+C_DEFINES=
+
+ifeq ($(BUILD_VARIANT),smallbuffers)
+	C_DEFINES+= -DCONFIG_ATH10K_SMALLBUFFERS
+endif
+
 MAKE_OPTS:= -C "$(PKG_BUILD_DIR)" \
 	$(KERNEL_MAKE_FLAGS) \
-	EXTRA_CFLAGS="-I$(PKG_BUILD_DIR)/include $(IREMAP_CFLAGS) \
+	EXTRA_CFLAGS="-I$(PKG_BUILD_DIR)/include $(IREMAP_CFLAGS) $(C_DEFINES)" \
 		      -I$(STAGING_DIR)/usr/include/qca-nss-drv" \
 	KLIB_BUILD="$(LINUX_DIR)" \
 	MODPROBE=true \

package/kernel/mac80211/ath.mk

@@ -1,5 +1,5 @@
 PKG_DRIVERS += \
-	ath ath5k ath6kl ath6kl-sdio ath6kl-usb ath9k ath9k-common ath9k-htc ath10k \
+	ath ath5k ath6kl ath6kl-sdio ath6kl-usb ath9k ath9k-common ath9k-htc ath10k ath10k-smallbuffers \
 	ath11k ath11k-ahb ath11k-pci carl9170 owl-loader ar5523 wil6210
 
 PKG_CONFIG_DEPENDS += \
@@ -59,6 +59,7 @@ config-$(CONFIG_ATH11K_MEM_PROFILE_512M) += ATH11K_MEM_PROFILE_512M
 
 config-$(call config_package,ath9k-htc) += ATH9K_HTC
 config-$(call config_package,ath10k) += ATH10K ATH10K_PCI
+config-$(call config_package,ath10k-smallbuffers) += ATH10K ATH10K_PCI ATH10K_SMALLBUFFERS
 config-$(call config_package,ath11k) += ATH11K
 config-$(call config_package,ath11k-ahb) += ATH11K_AHB
 config-$(call config_package,ath11k-pci) += ATH11K_PCI
@@ -267,6 +268,7 @@ define KernelPackage/ath10k
 	$(PKG_BUILD_DIR)/drivers/net/wireless/ath/ath10k/ath10k_core.ko \
 	$(PKG_BUILD_DIR)/drivers/net/wireless/ath/ath10k/ath10k_pci.ko
   AUTOLOAD:=$(call AutoProbe,ath10k_pci)
+  VARIANT:=regular
 endef
 
 define KernelPackage/ath10k/description
@@ -280,15 +282,21 @@ define KernelPackage/ath10k/config
        config ATH10K_LEDS
                bool "Enable LED support"
                default y
-               depends on PACKAGE_kmod-ath10k
+               depends on PACKAGE_kmod-ath10k || PACKAGE_kmod-ath10k-smallbuffers
 
        config ATH10K_THERMAL
                bool "Enable thermal sensors and throttling support"
                default y
-               depends on PACKAGE_kmod-ath10k
+               depends on PACKAGE_kmod-ath10k || PACKAGE_kmod-ath10k-smallbuffers
 
 endef
 
+define KernelPackage/ath10k-smallbuffers
+  $(call KernelPackage/ath10k)
+  TITLE+= (small buffers for low-RAM devices)
+  VARIANT:=smallbuffers
+endef
+
 define KernelPackage/ath11k
   $(call KernelPackage/mac80211/Default)
   TITLE:=Qualcomm 802.11ax wireless chipset support (common code)

package/kernel/mac80211/patches/ath/990-ath10k-small-buffers.patch

@@ -0,0 +1,64 @@
+--- a/drivers/net/wireless/ath/ath10k/htt.h
++++ b/drivers/net/wireless/ath/ath10k/htt.h
+@@ -235,7 +235,11 @@ enum htt_rx_ring_flags {
+ };
+ 
+ #define HTT_RX_RING_SIZE_MIN 128
++#ifndef CONFIG_ATH10K_SMALLBUFFERS
+ #define HTT_RX_RING_SIZE_MAX 2048
++#else
++#define HTT_RX_RING_SIZE_MAX 512
++#endif
+ #define HTT_RX_RING_SIZE HTT_RX_RING_SIZE_MAX
+ #define HTT_RX_RING_FILL_LEVEL (((HTT_RX_RING_SIZE) / 2) - 1)
+ #define HTT_RX_RING_FILL_LEVEL_DUAL_MAC (HTT_RX_RING_SIZE - 1)
+--- a/drivers/net/wireless/ath/ath10k/pci.c
++++ b/drivers/net/wireless/ath/ath10k/pci.c
+@@ -131,7 +131,11 @@ static const struct ce_attr pci_host_ce_
+ 		.flags = CE_ATTR_FLAGS,
+ 		.src_nentries = 0,
+ 		.src_sz_max = 2048,
++#ifndef CONFIG_ATH10K_SMALLBUFFERS
+ 		.dest_nentries = 512,
++#else
++		.dest_nentries = 128,
++#endif
+ 		.recv_cb = ath10k_pci_htt_htc_rx_cb,
+ 	},
+ 
+@@ -140,7 +144,11 @@ static const struct ce_attr pci_host_ce_
+ 		.flags = CE_ATTR_FLAGS,
+ 		.src_nentries = 0,
+ 		.src_sz_max = 2048,
++#ifndef CONFIG_ATH10K_SMALLBUFFERS
+ 		.dest_nentries = 128,
++#else
++		.dest_nentries = 64,
++#endif
+ 		.recv_cb = ath10k_pci_htc_rx_cb,
+ 	},
+ 
+@@ -167,7 +175,11 @@ static const struct ce_attr pci_host_ce_
+ 		.flags = CE_ATTR_FLAGS,
+ 		.src_nentries = 0,
+ 		.src_sz_max = 512,
++#ifndef CONFIG_ATH10K_SMALLBUFFERS
+ 		.dest_nentries = 512,
++#else
++		.dest_nentries = 128,
++#endif
+ 		.recv_cb = ath10k_pci_htt_rx_cb,
+ 	},
+ 
+@@ -192,7 +204,11 @@ static const struct ce_attr pci_host_ce_
+ 		.flags = CE_ATTR_FLAGS,
+ 		.src_nentries = 0,
+ 		.src_sz_max = 2048,
++#ifndef CONFIG_ATH10K_SMALLBUFFERS
+ 		.dest_nentries = 128,
++#else
++		.dest_nentries = 96,
++#endif
+ 		.recv_cb = ath10k_pci_pktlog_rx_cb,
+ 	},
+