linux-kernel - [PATCH] ath10k: increase rx buffer size to 2048

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Date:   Wed,  5 Feb 2020 20:10:43 +0100
From:   Linus Lüssing <linus.luessing@...3.blue>
To:     ath10k@...ts.infradead.org
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        Ben Greear <greearb@...delatech.com>,
        Simon Wunderlich <sw@...onwunderlich.de>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Linus Lüssing <ll@...onwunderlich.de>
Subject: [PATCH] ath10k: increase rx buffer size to 2048

From: Linus Lüssing <ll@...onwunderlich.de>

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/9e5ab25027e0971fa24ccf93373324c08c4e992d
Cc: Ben Greear <greearb@...delatech.com>
Signed-off-by: Linus Lüssing <ll@...onwunderlich.de>
---
 drivers/net/wireless/ath/ath10k/htt.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath10k/htt.h b/drivers/net/wireless/ath/ath10k/htt.h
index 4a12564fc30e..6a2b5e10e568 100644
--- a/drivers/net/wireless/ath/ath10k/htt.h
+++ b/drivers/net/wireless/ath/ath10k/htt.h
@@ -2220,7 +2220,7 @@ 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
-- 
2.25.0