Some CDC_NCM devices are used as docks for laptops. In this case, it
makes sense to accept multicast Ethernet traffic, as these devices
can reside in a proper LAN. Without this, mDNS or IPv6 simply do not
work.
Signed-off-by: Miguel Rodríguez Pérez <mig...@det.uvigo.gal>
---
drivers/net/usb/cdc_ncm.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index d6b51e2b9495..50af1d9d0102 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -132,6 +132,33 @@ static void cdc_ncm_get_strings(struct net_device
__always_unused *netdev, u32 s
static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32
new_tx);
+static void cdc_ncm_update_filter(struct usbnet *dev)
+{
+ struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
+ u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
+ struct net_device *net = dev->net;
+
+ u16 cdc_filter = USB_CDC_PACKET_TYPE_DIRECTED
+ | USB_CDC_PACKET_TYPE_BROADCAST;
+
+ /* filtering on the device is an optional feature and not worth
+ * the hassle so we just roughly care about snooping and if any
+ * multicast is requested, we take every multicast
+ */
+ if (net->flags & IFF_PROMISC)
+ cdc_filter |= USB_CDC_PACKET_TYPE_PROMISCUOUS;
+ if (!netdev_mc_empty(net) || (net->flags & IFF_ALLMULTI))
+ cdc_filter |= USB_CDC_PACKET_TYPE_ALL_MULTICAST;
+
+ usbnet_write_cmd(dev,
+ USB_CDC_SET_ETHERNET_PACKET_FILTER,
+ USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
+ cdc_filter,
+ iface_no,
+ NULL,
+ 0);
+}
+
static const struct ethtool_ops cdc_ncm_ethtool_ops = {
.get_link = usbnet_get_link,
.nway_reset = usbnet_nway_reset,
@@ -1652,6 +1679,7 @@ static const struct driver_info cdc_ncm_info = {
.status = cdc_ncm_status,
.rx_fixup = cdc_ncm_rx_fixup,
.tx_fixup = cdc_ncm_tx_fixup,
+ .set_rx_mode = cdc_ncm_update_filter,
};
/* Same as cdc_ncm_info, but with FLAG_WWAN */
--
2.17.1
On 29/06/18 16:45, Miguel Rodríguez Pérez wrote:
> Subject: [PATCH 1/2] Hook into usbnet_change_mtu respecting usbnet
> driver_info
>
> Change the way cdc_ncm_change_mtu hooks into the netdev_ops
> structure so that changes into usbnet driver_info operations
> can be respected. Without this, is was not possible to hook
> into usbnet_set_rx_mode.
>
> Signed-off-by: Miguel Rodríguez Pérez <mig...@det.uvigo.gal>
> ---
> 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);
>
--
Miguel Rodríguez Pérez
Laboratorio de Redes
EE Telecomunicación – Universidade de Vigo
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