Hey > > I've been working on updating ModemManager to allow setting up QMAP > > data aggregated links transparently, either with qmi_wwan > > add_mux/del_mux or with qmi_wwan+rmnet (pass_through=Y). > > > > See > > https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/447 > > > > For the qmi_wwan+rmnet logic this MR in libqmi to disable the MAP > > checksum seems to be required, I don't fully understand why yet: > > https://gitlab.freedesktop.org/mobile-broadband/libqmi/-/merge_requests/215 > > > > For the qmi_wwan add_mux/del_mux logic, it works quite well without > > any additional thing required, with the limitation of max 4 links for > > now, because we cannot create new links once the master interface is > > already up (so we always precreate 4 link interfaces upon the first > > connection attempt). The MTU of the master link is set to the max data > > aggregation size reported by the modem in this case. > > > > What do you think of these changes? For now, I've made it the default > > to "multiplex=request" when setting up a connection, so that you can > > directly use e.g. NetworkManager to bring up the connection without > > any single change in NetworkManager itself. That may change later on, > > and we may leave the default as "multiplex=none" instead; comments > > welcome on that as well. > > > > Anyone wants to give all this a try? Comments? > > Great work Aleksander, I'll be happy to test this (probably next week). > Aggregation offered by QMAP is especially useful for reaching max 5G > throughput. >
Please let me know what your tests go! > I've heard that some modems support checksum offload, and it seems > already supported on rmnet kernel side (MAPv5). Not sure however how > it needs to be configured for the modem side, maybe via a QMI > wda_set_data_format parameter. On high throughput, the CPU spends > substantial time on checksumming, so it could be useful to have that > at some point. > I have no idea how that is configured in the modem side either; maybe we're indeed missing some parameter in the WDA Set Data Format message, because as soon as I enable MAPv4 the traffic is broken in my tests: https://gitlab.freedesktop.org/mobile-broadband/libqmi/-/merge_requests/215. I have seen the MAPv5 patches in the LKML, but haven't tried that either. -- Aleksander https://aleksander.es _______________________________________________ ModemManager-devel mailing list ModemManager-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/modemmanager-devel
