netdev - [PATCH v2 3/4] Replace the way cdc_ncm hooks into usbnet_change

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Message-ID: <ee6460ed-5ed2-72a2-fc37-d8272610e9b5@det.uvigo.gal>
Date:   Sat, 30 Jun 2018 19:32:35 +0200
From:   Miguel Rodríguez Pérez <miguel@....uvigo.gal>
To:     linux-usb@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH v2 3/4] Replace the way cdc_ncm hooks into usbnet_change_mtu

Previously cdc_ncm overwrited netdev_ops used by usbnet
thus preventing hooking into set_rx_mode. This patch
preserves usbnet hooks into netdev_ops, and add an
additional one for change_mtu needed by cdc_ncm.
---
 drivers/net/usb/cdc_ncm.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index 9e1b74590682..d6b51e2b9495 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -750,16 +750,7 @@ int cdc_ncm_change_mtu(struct net_device *net, int
new_mtu)
 }
 EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);

-static const struct net_device_ops cdc_ncm_netdev_ops = {
-	.ndo_open	     = usbnet_open,
-	.ndo_stop	     = usbnet_stop,
-	.ndo_start_xmit	     = usbnet_start_xmit,
-	.ndo_tx_timeout	     = usbnet_tx_timeout,
-	.ndo_get_stats64     = usbnet_get_stats64,
-	.ndo_change_mtu	     = cdc_ncm_change_mtu,
-	.ndo_set_mac_address = eth_mac_addr,
-	.ndo_validate_addr   = eth_validate_addr,
-};
+static struct net_device_ops cdc_ncm_netdev_ops;

 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf,
u8 data_altsetting, int drvflags)
 {
@@ -939,6 +930,8 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct
usb_interface *intf, u8 data_
 	dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group;

 	/* must handle MTU changes */
+	cdc_ncm_netdev_ops = *dev->net->netdev_ops;
+	cdc_ncm_netdev_ops.ndo_change_mtu = cdc_ncm_change_mtu;
 	dev->net->netdev_ops = &cdc_ncm_netdev_ops;
 	dev->net->max_mtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);

-- 
2.17.1

-- 
Miguel Rodríguez Pérez
Laboratorio de Redes
EE Telecomunicación – Universidade de Vigo