linux-kernel - RE: USB GADGET: have a question about usb2eth

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Date:   Mon, 17 Oct 2016 12:28:42 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Lipengcheng <lpc.li@...ilicon.com>,
        Peter Chen <hzpeterchen@...il.com>
Cc:     "gregkh\@linuxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: USB GADGET: have a question about usb2eth


Hi,

(please, avoid top-posting: http://daringfireball.net/2007/07/on_top)

Lipengcheng <lpc.li@...ilicon.com> writes:
> Hi,
> 	thank you for your suggestion.
>
> 	I have a question about usb2eth. In the function gen_ndis_set_resp
> of the rndis.c, the value of *params->filter may be 0x20 from the
> pc set command; Howerver the value is used cdc_filter = 
> dev->port_usb->cdc_filter in the function eth_start_xmit of the u_ether.c.
> If we do not judge the RNDIS_PACKET_TYPE_PROMISCUOUS and the value is
> 0x20, the broadcast packet can not send the pc win7; At the result, 
> the linux ping the win7 is slow an the first. At the same time, Why are 
> different value between RNDIS_PACKET_TYPE_PROMISCUOUS and
> USB_CDC_PACKET_TYPE_PROMISCUOUS? If the value of RNDIS_PACKET_TYPE_PROMISCUOUS

because they are defined by different specifications. You should read
both CDC specification from USB.org and RNDIS spec from Microsoft to
understand the details of that.

> and USB_CDC_PACKET_TYPE_PROMISCUOUS is same, then the linux ping the win7 is
> normal speed.

I don't understand what's going on here. Care to describe which kernel
you're using, which USB peripheral controller, what is the actual
problem you're trying to solve?

-- 
balbi

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