netdev - [PATCH 3/3] net: mhi: Increase the default MTU from 16K to 32K

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Date: Tue,  6 Jun 2023 18:01:19 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: mhi@...ts.linux.dev,
	linux-arm-msm@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	loic.poulain@...aro.org,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH 3/3] net: mhi: Increase the default MTU from 16K to 32K

Most of the Qualcomm endpoint devices are supporting 32K MTU for the
UL (Uplink) and DL (Downlink) channels. So let's use the same value
in the MHI NET driver also. This gives almost 2x increase in the throughput
for the UL channel.

Below is the comparision:

iperf on the UL channel with 16K MTU:

[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec   353 MBytes   296 Mbits/sec

iperf on the UL channel with 32K MTU:

[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec   695 MBytes   583 Mbits/sec

Cc: Loic Poulain <loic.poulain@...aro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/net/mhi_net.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/mhi_net.c b/drivers/net/mhi_net.c
index 3d322ac4f6a5..eddc2c701da4 100644
--- a/drivers/net/mhi_net.c
+++ b/drivers/net/mhi_net.c
@@ -14,7 +14,7 @@
 
 #define MHI_NET_MIN_MTU		ETH_MIN_MTU
 #define MHI_NET_MAX_MTU		0xffff
-#define MHI_NET_DEFAULT_MTU	0x4000
+#define MHI_NET_DEFAULT_MTU	0x8000
 
 struct mhi_net_stats {
 	u64_stats_t rx_packets;
-- 
2.25.1