From 6845688016e433ee808b0a0969c754424603cb67 Mon Sep 17 00:00:00 2001
From: Sven Eckelmann <sven@narfation.org>
Date: Mon, 18 Jun 2018 19:56:49 +0200
Subject: [PATCH] ath10k-ct: reduce memory consumption
ath10k-ct uses a rather high number of buffers to communicate with the
QCA/Candelatech firmware. Especially the HTC (host-target-communication)
and HTT (host-target-transport) can take up a lot of memory when data is
transferred over a ath10k wifi link.
Even a 256MB device with three radios can go OOM (while sending to three
devices using UDP unicast/multicast packets) with the default buffer
limits. Unfortunately, this also reduced the maximum 5GHz throughput on an
IPQ40xx device from 494/432 Mbit/s for TCP transfers (download/upload) to
438/343 Mbit/s. These throughput values should still be good enough for a
Freifunk installation. And these changes are already used by ath10k in
OpenWrt 18.06.
---
...-ath10k-ct-reduce-memory-consumption.patch | 78 +++++++++++++++++++
1 file changed, 78 insertions(+)
create mode 100644 patches/openwrt/0012-ath10k-ct-reduce-memory-consumption.patch
diff --git a/patches/openwrt/0012-ath10k-ct-reduce-memory-consumption.patch b/patches/openwrt/0012-ath10k-ct-reduce-memory-consumption.patch
new file mode 100644
index 000000000..a68faff10
--- /dev/null
+++ b/patches/openwrt/0012-ath10k-ct-reduce-memory-consumption.patch
@@ -0,0 +1,78 @@
+From: Sven Eckelmann <sven@narfation.org>
+Date: Mon, 18 Jun 2018 21:03:37 +0200
+Subject: ath10k-ct: reduce memory consumption
+
+ath10k uses a rather high number of buffers to communicate with the QCA
+firmware. Especially the HTC (host-target-communication) and HTT
+(host-target-transport) can take up a lot of memory when data is
+transferred over a ath10k wifi link.
+
+This problem was already worked around in commit cc189c0b7fa0 ("mac80211:
+enable ath10k AHB support for QCA4019") for the ath10k driver from
+mac80211. But this change was forgotton for the ath10k-ct driver.
+
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+
+Forwarded: https://github.com/openwrt/openwrt/pull/1077
+
+diff --git a/package/kernel/ath10k-ct/patches/960-0010-ath10k-limit-htt-rx-ring-size.patch b/package/kernel/ath10k-ct/patches/960-0010-ath10k-limit-htt-rx-ring-size.patch
+new file mode 100644
+index 0000000000000000000000000000000000000000..7ee89be9cc4c7602db10dc6c118b803e3b130192
+--- /dev/null
++++ b/package/kernel/ath10k-ct/patches/960-0010-ath10k-limit-htt-rx-ring-size.patch
+@@ -0,0 +1,11 @@
++--- a/ath10k-4.13/htt.h
+++++ b/ath10k-4.13/htt.h
++@@ -199,7 +199,7 @@ enum htt_rx_ring_flags {
++ };
++
++ #define HTT_RX_RING_SIZE_MIN 128
++-#define HTT_RX_RING_SIZE_MAX 2048
+++#define HTT_RX_RING_SIZE_MAX 512
++
++ struct htt_rx_ring_setup_ring {
++ __le32 fw_idx_shadow_reg_paddr;
+diff --git a/package/kernel/ath10k-ct/patches/960-0011-ath10k-limit-pci-buffer-size.patch b/package/kernel/ath10k-ct/patches/960-0011-ath10k-limit-pci-buffer-size.patch
+new file mode 100644
+index 0000000000000000000000000000000000000000..82ccb88ccbf341ab63da8fd12aeb13ff468cc98a
+--- /dev/null
++++ b/package/kernel/ath10k-ct/patches/960-0011-ath10k-limit-pci-buffer-size.patch
+@@ -0,0 +1,38 @@
++--- a/ath10k-4.13/pci.c
+++++ b/ath10k-4.13/pci.c
++@@ -128,7 +128,7 @@ static struct ce_attr host_ce_config_wla
++ .flags = CE_ATTR_FLAGS,
++ .src_nentries = 0,
++ .src_sz_max = 2048,
++- .dest_nentries = 512,
+++ .dest_nentries = 128,
++ .recv_cb = ath10k_pci_htt_htc_rx_cb,
++ },
++
++@@ -137,7 +137,7 @@ static struct ce_attr host_ce_config_wla
++ .flags = CE_ATTR_FLAGS,
++ .src_nentries = 0,
++ .src_sz_max = 2048,
++- .dest_nentries = 128,
+++ .dest_nentries = 64,
++ .recv_cb = ath10k_pci_htc_rx_cb,
++ },
++
++@@ -164,7 +164,7 @@ static struct ce_attr host_ce_config_wla
++ .flags = CE_ATTR_FLAGS,
++ .src_nentries = 0,
++ .src_sz_max = 512,
++- .dest_nentries = 512,
+++ .dest_nentries = 128,
++ .recv_cb = ath10k_pci_htt_rx_cb,
++ },
++
++@@ -189,7 +189,7 @@ static struct ce_attr host_ce_config_wla
++ .flags = CE_ATTR_FLAGS,
++ .src_nentries = 0,
++ .src_sz_max = 2048,
++- .dest_nentries = 128,
+++ .dest_nentries = 96,
++ .recv_cb = ath10k_pci_pktlog_rx_cb,
++ },
++
--
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