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net: usb: qmi_wwan: restore mtu min/max values after raw_ip switch

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usbnet creates network interfaces with min_mtu = 0 and
max_mtu = ETH_MAX_MTU.

These values are not modified by qmi_wwan when the network interface
is created initially, allowing, for example, to set mtu greater than 1500.

When a raw_ip switch is done (raw_ip set to 'Y', then set to 'N') the mtu
values for the network interface are set through ether_setup, with
min_mtu = ETH_MIN_MTU and max_mtu = ETH_DATA_LEN, not allowing anymore to
set mtu greater than 1500 (error: mtu greater than device maximum).

The patch restores the original min/max mtu values set by usbnet after a
raw_ip switch.

Signed-off-by: Daniele Palmas <dnlplm@gmail.com>
Acked-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniele Palmas 2020-02-21 14:17:05 +01:00 committed by David S. Miller
parent 39f3b41aa7
commit eae7172f81
1 changed files with 3 additions and 0 deletions
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3
drivers/net/usb/qmi_wwan.c
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@ -337,6 +337,9 @@ static void qmi_wwan_netdev_setup(struct net_device *net)
netdev_dbg(net, "mode: raw IP\n");
} else if (!net->header_ops) { /* don't bother if already set */
ether_setup(net);
/* Restoring min/max mtu values set originally by usbnet */
net->min_mtu = 0;
net->max_mtu = ETH_MAX_MTU;
clear_bit(EVENT_NO_IP_ALIGN, &dev->flags);
netdev_dbg(net, "mode: Ethernet\n");
}