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authorDaniele Palmas <dnlplm@gmail.com>2020-02-21 14:17:05 +0100
committerDavid S. Miller <davem@davemloft.net>2020-02-23 16:13:50 -0800
commiteae7172f8141eb98e64e6e81acc9e9d5b2add127 (patch)
tree8e3bc59282c0270a0e8b088e534582ccff30e99d /drivers/net/usb
parent39f3b41aa7cae917f928ef9f31d09da28188e5ed (diff)
downloadlinux-eae7172f8141eb98e64e6e81acc9e9d5b2add127.tar.bz2
net: usb: qmi_wwan: restore mtu min/max values after raw_ip switch
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>
Diffstat (limited to 'drivers/net/usb')
-rw-r--r--drivers/net/usb/qmi_wwan.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 3b7a3b8a5e06..5754bb6ca0ee 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -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");
}