MC7455: inconsistent QMI protocol error (14): 'CallFailed' - ipv4-only-allowed

[Tim Harvey]

Greetings,

I've got an MC7455 with the latest ATT firmware and an ATT SIM I'm
using with an Ubuntu 4.11 kernel and libqmi-1.18.0.

A typical successful connection on a clean power-up looks like:
root at ventana:~# qmi-network /dev/cdc-wdm0 start
Loading profile at /etc/qmi-network.conf...
    APN: m2m.com.attz
    APN user: unset
    APN password: unset
    qmi-proxy: yes
Checking data format with 'qmicli -d /dev/cdc-wdm0
--wda-get-data-format --device-open-proxy'...
Device link layer protocol retrieved: raw-ip
Getting expected data format with 'qmicli -d /dev/cdc-wdm0
--get-expected-data-format'...
Expected link layer protocol retrieved: 802-3
Updating kernel link layer protocol with 'qmicli -d /dev/cdc-wdm0
--set-expected-data-format=raw-ip'...
Kernel link layer protocol updated
Starting network with 'qmicli -d /dev/cdc-wdm0
--wds-start-network=apn='m2m.com.attz'  --client-no-release-cid
--device-open-proxy'...
Saving state at /tmp/qmi-network-state-cdc-wdm0... (CID: 35)
Saving state at /tmp/qmi-network-state-cdc-wdm0... (PDH: 63335264)
Network started successfully

But sometimes I am unable to connect on a clean power-up with:
root at ventana:~# qmi-network /dev/cdc-wdm0 start
Loading profile at /etc/qmi-network.conf...
    APN: m2m.com.attz
    APN user: unset
    APN password: unset
    qmi-proxy: yes
Checking data format with 'qmicli -d /dev/cdc-wdm0
--wda-get-data-format --device-open-proxy'...
Device link layer protocol retrieved: raw-ip
Getting expected data format with 'qmicli -d /dev/cdc-wdm0
--get-expected-data-format'...
Expected link layer protocol retrieved: raw-ip
Device and kernel link layer protocol match: raw-ip
Starting network with 'qmicli -d /dev/cdc-wdm0
--wds-start-network=apn='m2m.com.attz'  --client-no-release-cid
--device-open-proxy'...
error: couldn't start network: QMI protocol error (14): 'CallFailed'
call end reason (1): generic-unspecified
verbose call end reason (6,50): [3gpp] ipv4-only-allowed
Saving state at /tmp/qmi-network-state-cdc-wdm0... (CID: 35)
error: network start failed, no packet data handle
Clearing state at /tmp/qmi-network-state-cdc-wdm0...

I'm not clear what the 'ipv4-only-allowed' means but I would guess
something is erroneously setting the ip-family? I'm under the
impression that setting the ip family via libqmi is not yet supported
so I'm not sure how to check to see if that's the reason for the
failure.

It looks like the PDP allows for both ipv4 and ipv6:
root at ventana:~# qmicli -d /dev/cdc-wdm0 --wds-get-profile-list=3gpp
Profile list retrieved:
        [1] 3gpp -
                APN: 'm2m.com.attz'
                PDP type: 'ipv4-or-ipv6'
                Auth: 'pap, chap'

I can fairly easily reproduce the issue if I issue a specific set of
qmicli commands prior to the qmi-network start:
qmicli -d /dev/cdc-wdm0 --dms-swi-get-current-firmware
qmicli -d /dev/cdc-wdm0 --nas-get-signal-info
qmicli -d /dev/cdc-wdm0 --nas-get-system-selection-preference
qmicli -d /dev/cdc-wdm0 --nas-network-scan
qmicli -d /dev/cdc-wdm0 --nas-get-home-network
qmicli -d /dev/cdc-wdm0 --nas-get-system-info
qmicli -d /dev/cdc-wdm0 --nas-get-operator-name
qmicli -d /dev/cdc-wdm0 --nas-get-serving-system
qmicli -d /dev/cdc-wdm0 --wds-get-current-settings

I can't pin down a specific one though that causes it to get into this state.

Any ideas?

Regards,

Tim