[PATCH] ath10k: Increase buffer to fix >1500 MTU frames

[mail at adrianschmutzler.de]

Reviewed-by: Adrian Schmutzler <freifunk at adrianschmutzler.de>

> -----Original Message-----
> From: franken-dev [mailto:franken-dev-bounces at freifunk.net] On Behalf
> Of Fabian Bläse
> Sent: Donnerstag, 30. April 2020 15:02
> To: franken-dev at freifunk.net
> Subject: [PATCH] ath10k: Increase buffer to fix >1500 MTU frames
> 
> The ath10k seems to have an issue with large frames transmitted over
> 802.11s. This issue has been worked around in ath10k-ct. The same patch has
> now been merged into OpenWrt.
> 
> As this might fix mesh issues with ath10k devices, it is backported to our
> firmware using a build patch.
> 
> Link:
> https://github.com/openwrt/openwrt/commit/066ec97167e49b5c037b04dc4
> ec76c4cad5b75e2
> Link: https://github.com/greearb/ath10k-ct/issues/89
> Link: https://github.com/greearb/ath10k-
> ct/commit/9e5ab25027e0971fa24ccf93373324c08c4e992d
> 
> Signed-off-by: Fabian Bläse <fabian at blaese.de>
> ---
>  ...h10k-increase-rx-buffer-size-to-2048.patch | 79 +++++++++++++++++++
>  1 file changed, 79 insertions(+)
>  create mode 100644 build_patches/openwrt/0030-mac80211-ath10k-
> increase-rx-buffer-size-to-2048.patch
> 
> diff --git a/build_patches/openwrt/0030-mac80211-ath10k-increase-rx-
> buffer-size-to-2048.patch b/build_patches/openwrt/0030-mac80211-ath10k-
> increase-rx-buffer-size-to-2048.patch
> new file mode 100644
> index 0000000..8bfe089
> --- /dev/null
> +++ b/build_patches/openwrt/0030-mac80211-ath10k-increase-rx-buffer-
> size
> +++ -to-2048.patch
> @@ -0,0 +1,79 @@
> +From 40423025eb5d203affd1e0bb6677d5fabf7a522d Mon Sep 17 00:00:00
> 2001
> +From: =?UTF-8?q?Linus=20L=C3=BCssing?= <ll at simonwunderlich.de>
> +Date: Wed, 5 Feb 2020 20:10:43 +0100
> +Subject: [PATCH] mac80211: ath10k: increase rx buffer size to 2048
> +MIME-Version: 1.0
> +Content-Type: text/plain; charset=UTF-8
> +Content-Transfer-Encoding: 8bit
> +
> +Before, only frames with a maximum size of 1528 bytes could be
> +transmitted between two 802.11s nodes.
> +
> +For batman-adv for instance, which adds its own header to each frame,
> +we typically need an MTU of at least 1532 bytes to be able to transmit
> +without fragmentation.
> +
> +This patch now increases the maxmimum frame size from 1528 to 1656
> +bytes.
> +
> +Tested with two ath10k devices in 802.11s mode, as well as with
> +batman-adv on top of 802.11s with forwarding disabled.
> +
> +Fix originally found and developed by Ben Greear.
> +
> +Link: https://github.com/greearb/ath10k-ct/issues/89
> +Link:
> +https://github.com/greearb/ath10k-
> ct/commit/9e5ab25027e0971fa24ccf93373
> +324c08c4e992d
> +Cc: Ben Greear <greearb at candelatech.com>
> +Signed-off-by: Linus Lüssing <ll at simonwunderlich.de>
> +Signed-off-by: Sven Eckelmann <sven at narfation.org>
> +---
> + ...h10k-increase-rx-buffer-size-to-2048.patch | 37 +++++++++++++++++++
> + 1 file changed, 37 insertions(+)
> + create mode 100644
> +package/kernel/mac80211/patches/ath/922-ath10k-increase-rx-buffer-
> size-
> +to-2048.patch
> +
> +diff --git
> +a/package/kernel/mac80211/patches/ath/922-ath10k-increase-rx-buffer-
> siz
> +e-to-2048.patch
> +b/package/kernel/mac80211/patches/ath/922-ath10k-increase-rx-buffer-
> siz
> +e-to-2048.patch
> +new file mode 100644
> +index 0000000000..55429139fa
> +--- /dev/null
> ++++ b/package/kernel/mac80211/patches/ath/922-ath10k-increase-rx-
> buffer
> ++++ -size-to-2048.patch
> +@@ -0,0 +1,37 @@
> ++From: Linus Lüssing <ll at simonwunderlich.de>
> ++Date: Wed, 5 Feb 2020 20:10:43 +0100
> ++Subject: ath10k: increase rx buffer size to 2048
> ++
> ++Before, only frames with a maximum size of 1528 bytes could be
> ++transmitted between two 802.11s nodes.
> ++
> ++For batman-adv for instance, which adds its own header to each frame,
> ++we typically need an MTU of at least 1532 bytes to be able to transmit
> ++without fragmentation.
> ++
> ++This patch now increases the maxmimum frame size from 1528 to 1656
> ++bytes.
> ++
> ++Tested with two ath10k devices in 802.11s mode, as well as with
> ++batman-adv on top of 802.11s with forwarding disabled.
> ++
> ++Fix originally found and developed by Ben Greear.
> ++
> ++Link: https://github.com/greearb/ath10k-ct/issues/89
> ++Link:
> ++https://github.com/greearb/ath10k-
> ct/commit/9e5ab25027e0971fa24ccf9337
> ++3324c08c4e992d
> ++Cc: Ben Greear <greearb at candelatech.com>
> ++Signed-off-by: Linus Lüssing <ll at simonwunderlich.de>
> ++
> ++Forwarded: https://patchwork.kernel.org/patch/11367055/
> ++
> ++--- a/drivers/net/wireless/ath/ath10k/htt.h
> +++++ b/drivers/net/wireless/ath/ath10k/htt.h
> ++@@ -2219,7 +2219,7 @@ struct htt_rx_chan_info {
> ++  * Should be: sizeof(struct htt_host_rx_desc) + max rx MSDU size,
> ++  * rounded up to a cache line size.
> ++  */
> ++-#define HTT_RX_BUF_SIZE 1920
> +++#define HTT_RX_BUF_SIZE 2048
> ++ #define HTT_RX_MSDU_SIZE (HTT_RX_BUF_SIZE - (int)sizeof(struct
> ++ htt_rx_desc))
> ++
> ++ /* Refill a bunch of RX buffers for each refill round so that FW/HW
> ++ can handle
> +--
> +2.26.2
> +
> --
> 2.26.2
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