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 -- 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
