What I suspect, is that all this mess started when Huawei introduce new firmware releases that changed something in the IPV6 support. Bjorn - do you remember when a guy called Thomas reported us a problem about an LTE huawei modem that wasn't working with huawei_cdc_ncm? And you then discovered the problem was originated from some changes in the ordering of cdc_ncm actions; what happened then? Did Thomas get his modem back to working state? Sorry Thomas - you wilol read this message but I don't remember your surname, and might get confused with other people called Thomas. On Thu, 27 Nov 2014, Alex Strizhevsky wrote: ==Date: Thu, 27 Nov 2014 13:36:37 ==From: Alex Strizhevsky <alexxst@xxxxxxxxx> ==To: Bjørn Mork <bjorn@xxxxxxx>, ShaojunMidge.Tan@xxxxxxxxxxxxxx, == Mingying.Zhu@xxxxxxxxxxxxxx ==Cc: Enrico Mioso <mrkiko.rs@xxxxxxxxx>, youtux@xxxxxxxxx, == linux-usb@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, == Eli.Britstein@xxxxxxxxxxxxxx ==Subject: Re: Is this 32-bit NCM? == ==Adding my colleagues - Eli, Kevin & Midge. == ==Any ideas are welcome ;) == == ==On Thu, Nov 27, 2014 at 12:03 PM, Bjørn Mork <bjorn@xxxxxxx> wrote: == 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 == == == ==
