netdev - [PATCH net-next 2/2] net: mhi: proto

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Date:   Mon,  1 Mar 2021 16:41:52 +0100
From:   Loic Poulain <loic.poulain@...aro.org>
To:     kuba@...nel.org, davem@...emloft.net
Cc:     netdev@...r.kernel.org, Loic Poulain <loic.poulain@...aro.org>
Subject: [PATCH net-next 2/2] net: mhi: proto_mbim: Adjust MTU and MRU

MBIM protocol makes the interface asymmetric, ingress data received
from MHI is MBIM protocol, that can contain multiple aggregated IP
packets, while egress data received from network stack is IP protocol.

Set a default MTU to 1500 (usual network MTU for WWAN), and MRU to 32K
which is the default size of MBIM-over-MHI packets.

Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
---
 drivers/net/mhi/proto_mbim.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/mhi/proto_mbim.c b/drivers/net/mhi/proto_mbim.c
index 75b5484..29d8577 100644
--- a/drivers/net/mhi/proto_mbim.c
+++ b/drivers/net/mhi/proto_mbim.c
@@ -26,6 +26,9 @@
 
 #define MBIM_NDP16_SIGN_MASK 0x00ffffff
 
+#define MHI_MBIM_DEFAULT_MRU 32768
+#define MHI_MBIM_DEFAULT_MTU 1500
+
 struct mbim_context {
 	u16 rx_seq;
 	u16 tx_seq;
@@ -282,6 +285,8 @@ static int mbim_init(struct mhi_net_dev *mhi_netdev)
 		return -ENOMEM;
 
 	ndev->needed_headroom = sizeof(struct mbim_tx_hdr);
+	ndev->mtu = MHI_MBIM_DEFAULT_MTU;
+	mhi_netdev->mru = MHI_MBIM_DEFAULT_MRU;
 
 	return 0;
 }
-- 
2.7.4