Hi, Lipengcheng <lpc.li@xxxxxxxxxxxxx> writes: >> -----Original Message----- >> From: Felipe Balbi [mailto:balbi@xxxxxxxxxx] >> Sent: Monday, October 17, 2016 5:29 PM >> To: Lipengcheng; Peter Chen >> Cc: gregkh@xxxxxxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx >> Subject: RE: USB GADGET: have a question about usb2eth >> >> >> Hi, >> >> (please, avoid top-posting: http://daringfireball.net/2007/07/on_top) >> >> Lipengcheng <lpc.li@xxxxxxxxxxxxx> 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. > Ok. I will understand the different both CDC specification from USB.org and RNDIS spec from Microsoft. They should have transformational rule in the linux code > between CDC spe and RNDIS spe. Through debugging, I found there has been no conversion about the filter. I feel a little problem. I will find the rule. >> >> > 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? > > VERSION = 3.18.20 why not v4.9-rc1? We can't help you with your kernel in this forum, I reckon you realise that :-) > USB peripheral controller: Synopsys HS OTG Linux Software Driver. It's > not the standard linux code. But I think the controller do not have > problem. so you're not using drivers/usb/dwc2? > The probem is that I am using one controller board with Linux running > on it. I want to interface my device to the Host computer (Windows OS) > through USB. many have tried and succeeded before you :-) > I have driver ready at device side (linux) and the bridge has been > established. The device side ping the Host computer is very slow at > the first time. It spends a few minutes. The problem is the first ping > takes too long time. Now I have a way to quickly ping at the first , > but I do not know the risk about the change.I will continue debug the > problem. If it is valuable, I will submit the kernel community. Well, if you can reproduce the same problem with v4.8 or v4.9-rc1, then we'll be happy to review your patch. Thank you -- balbi
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