netdev - Re: [PATCH v3 1/4] Simplify usbnet_cdc_update

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Date:   Mon, 13 Jul 2020 16:43:11 -0400
From:   Wxcafé <wxcafe@...afe.net>
To:     Miguel Rodríguez Pérez 
        <miguel@....uvigo.gal>, oliver@...kum.org,
        linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH v3 1/4] Simplify usbnet_cdc_update_filter

Hey,

I've encountered that same problem a few days ago, found this thread
and these (unmerged) patches, "ported" them to a more current version
of the kernel (wasn't much work, let's be honest), and I was wondering
if it would be possible to get them merged, because this is still a
problem with cdc_ncm.

Here's the three "up to date" patches (based on 5.8-rc5), they work
insofar as I'm running with them, the bug isn't there anymore (I get
ethernet multicast packets correctly), and there's no obvious bug. I'm
not a dev though, so I have no idea if these are formatted correctly,
if the patch separation is correct, or anything like that, I just think
it would be great if this could be merged into mainline!

On Sun, 2018-07-01 at 11:05 +0200, Miguel Rodríguez Pérez wrote:
> Remove some unneded varibles to make the code easier to read
> and, replace the generic usb_control_msg function for the
> more specific usbnet_write_cmd.
> 
> Signed-off-by: Miguel Rodríguez Pérez <miguel@....uvigo.gal>
> NACKED-BY: Oliver Neukum <oneukum@...e.com>
> ---
>  drivers/net/usb/cdc_ether.c | 15 +++++----------
>  1 file changed, 5 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/net/usb/cdc_ether.c
> b/drivers/net/usb/cdc_ether.c
> index 178b956501a7..815ed0dc18fe 100644
> --- a/drivers/net/usb/cdc_ether.c
> +++ b/drivers/net/usb/cdc_ether.c
> @@ -77,9 +77,7 @@ static const u8 mbm_guid[16] = {
>  
>  static void usbnet_cdc_update_filter(struct usbnet *dev)
>  {
> -	struct cdc_state	*info = (void *) &dev->data;
> -	struct usb_interface	*intf = info->control;
> -	struct net_device	*net = dev->net;
> +	struct net_device *net = dev->net;
>  
>  	u16 cdc_filter = USB_CDC_PACKET_TYPE_DIRECTED
>  			| USB_CDC_PACKET_TYPE_BROADCAST;
> @@ -93,16 +91,13 @@ static void usbnet_cdc_update_filter(struct
> usbnet *dev)
>  	if (!netdev_mc_empty(net) || (net->flags & IFF_ALLMULTI))
>  		cdc_filter |= USB_CDC_PACKET_TYPE_ALL_MULTICAST;
>  
> -	usb_control_msg(dev->udev,
> -			usb_sndctrlpipe(dev->udev, 0),
> +	usbnet_write_cmd(dev,
>  			USB_CDC_SET_ETHERNET_PACKET_FILTER,
> -			USB_TYPE_CLASS | USB_RECIP_INTERFACE,
> +			USB_TYPE_CLASS | USB_DIR_OUT |
> USB_RECIP_INTERFACE,
>  			cdc_filter,
> -			intf->cur_altsetting->desc.bInterfaceNumber,
> +			dev->intf->cur_altsetting-
> >desc.bInterfaceNumber,
>  			NULL,
> -			0,
> -			USB_CTRL_SET_TIMEOUT
> -		);
> +			0);
>  }
>  
>  /* probes control interface, claims data interface, collects the
> bulk
-- 
Wxcafé <wxcafe@...afe.net>

View attachment "0001-net-cdc_ether-export-generic-usbnet_cdc_update_filte.patch" of type "text/x-patch" (3891 bytes)

View attachment "0002-net-usbnet-export-usbnet_set_rx_mode.patch" of type "text/x-patch" (1568 bytes)

View attachment "0003-net-cdc_ncm-hook-into-set_rx_mode-to-admit-multicast.patch" of type "text/x-patch" (2207 bytes)