Sorry for the late reply. I tried to calculate the offset as what windows did, but it did not help. Regards, Kevin On 12/01/2014 02:36 AM, Enrico Mioso wrote: > Thank you Bjorn for the help and suggestions. > These are parameters that the driver ends up choosing: > /sys/class/net/wwan0/cdc_ncm/bmNtbFormatsSupported:0x0003 > /sys/class/net/wwan0/cdc_ncm/dwNtbInMaxSize:131072 > /sys/class/net/wwan0/cdc_ncm/dwNtbOutMaxSize:16384 > /sys/class/net/wwan0/cdc_ncm/min_tx_pkt:14848 > /sys/class/net/wwan0/cdc_ncm/rx_max:16384 > /sys/class/net/wwan0/cdc_ncm/tx_max:16384 > /sys/class/net/wwan0/cdc_ncm/tx_timer_usecs:400 > /sys/class/net/wwan0/cdc_ncm/wNdpInAlignment:4 > /sys/class/net/wwan0/cdc_ncm/wNdpInDivisor:4 > /sys/class/net/wwan0/cdc_ncm/wNdpInPayloadRemainder:2 > /sys/class/net/wwan0/cdc_ncm/wNdpOutAlignment:4 > /sys/class/net/wwan0/cdc_ncm/wNdpOutDivisor:4 > /sys/class/net/wwan0/cdc_ncm/wNdpOutPayloadRemainder:2 > /sys/class/net/wwan0/cdc_ncm/wNtbOutMaxDatagrams:0 > > Sorry if I did not report them before. If I missed someone in CC please add it > guys. > Kevin - after you discovered that the device might handle the offset in a > different way, have you tried this approach? > > > On Thu, 27 Nov 2014, Bjørn Mork wrote: > > ==Date: Thu, 27 Nov 2014 11:03:24 > ==From: Bjørn Mork <bjorn@xxxxxxx> > ==To: Enrico Mioso <mrkiko.rs@xxxxxxxxx> > ==Cc: youtux@xxxxxxxxx, alexxst@xxxxxxxxx, linux-usb@xxxxxxxxxxxxxxx, > == netdev@xxxxxxxxxxxxxxx > ==Subject: Re: Is this 32-bit NCM? > == > ==Enrico Mioso <mrkiko.rs@xxxxxxxxx> writes: > == > ==> Ok - we can arrive to some ocnclusions regarding the E3272. > ==> First of all - the modem seems buggy enough to not be able to handle requests > ==> for different formats. You need to unplug and re-plug it, but this is onlyan > ==> impression and is reasonable. > ==> > ==> Then - the modem will accept to ndisdup the connection with > ==> at^ndisdup=1,1,"internet" > ==> but - if we use huawei_cdc_ncm + cdc_ncm we have no flow handling messages and > ==> the modem stops here. > ==> If we use the cdc_ncm 32-bit driver (modified) we get lotfs of > ==> ^dsflorpt > ==> that's how it should be. > ==> So I think we can say that something is changing. > ==> Then there's the alignment problem you mentioned in your previous reply. And > ==> this is hard to solve. > ==> could you try to help me understand where the problem is? > ==> I feel like we are very close to the solution but something isn't working. > ==> Or might be just try to change the 16 bit driver? > == > ==If you use a recent version of the driver as a basis, then you get the > ==CDC NCM NTB parameters in sysfs (if not, then you need to enable > ==debugging and look in the log for these values). For example: > == > ==bjorn@nemi:~$ grep . /sys/class/net/wwan0/cdc_ncm/* > ==/sys/class/net/wwan0/cdc_ncm/bmNtbFormatsSupported:0x0001 > ==/sys/class/net/wwan0/cdc_ncm/dwNtbInMaxSize:15360 > ==/sys/class/net/wwan0/cdc_ncm/dwNtbOutMaxSize:15360 > ==/sys/class/net/wwan0/cdc_ncm/min_tx_pkt:13824 > ==/sys/class/net/wwan0/cdc_ncm/rx_max:15360 > ==/sys/class/net/wwan0/cdc_ncm/tx_max:15360 > ==/sys/class/net/wwan0/cdc_ncm/tx_timer_usecs:400 > ==/sys/class/net/wwan0/cdc_ncm/wNdpInAlignment:4 > ==/sys/class/net/wwan0/cdc_ncm/wNdpInDivisor:1 > ==/sys/class/net/wwan0/cdc_ncm/wNdpInPayloadRemainder:0 > ==/sys/class/net/wwan0/cdc_ncm/wNdpOutAlignment:4 > ==/sys/class/net/wwan0/cdc_ncm/wNdpOutDivisor:32 > ==/sys/class/net/wwan0/cdc_ncm/wNdpOutPayloadRemainder:0 > ==/sys/class/net/wwan0/cdc_ncm/wNtbOutMaxDatagrams:32 > == > == > ==The possible problem I am thinking of is proper handling of the > ==wNdp*PayloadRemainder values. See section 3.3.4 "NCM Ethernet Frame > ==Alignment" in the spec. Which is confusing as hell, but if I understand > ==it correctly then we are supposed to align the start of the IP packets > ==(the "payload", _not_ the ethernet frame) to a whole wNdp*Divisor number > ==as long as the wNdp*PayloadRemainder is 0. > == > == > ==Bjørn > == This email and any files transmitted with it are confidential material. They are intended solely for the use of the designated individual or entity to whom they are addressed. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, use, distribution or copying of this communication is strictly prohibited and may be unlawful. If you have received this email in error please immediately notify the sender and delete or destroy any copy of this message -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
