Am 27.04.20 um 18:53 schrieb Frank Schäfer:
Am 18.04.20 um 13:20 schrieb Frank Schäfer:
Hi,
I'm currently testing Miraclecast
(https://github.com/albfan/miraclecast), an open source
Wifi-Display/Miracast implementation.
In one of my setups, I'm using a carl9170 device as sink, which fails
with the following debugging output:
...
TRACE: wpa: raw message: IFNAME=wlp0s2f1u8 <3>CTRL-EVENT-SCAN-STARTED
TRACE: wpa: raw message: <3>P2P-PROV-DISC-PBC-REQ 8e:79:67:11:22:33
p2p_dev_addr=8e:79:67:11:22:33 pri_dev_type=10-0050F204-5 name='MY
DEVICE' config_methods=0x188 dev_capab=0x25 group_capab=0x0
TRACE: wpa: raw message: <3>P2P-GO-NEG-REQUEST 8e:79:67:11:22:33
dev_passwd_id=4 go_intent=0
DEBUG: supplicant: GO Negotiation Request from 8e:79:67:11:22:33
(supplicant_event_p2p_go_neg_request() in
../../../src/wifi/wifid-supplicant.c:1065)
DEBUG: supplicant: connect to 8e:79:67:11:22:33 via pbc/(null)
(supplicant_peer_connect() in ../../../src/wifi/wifid-supplicant.c:739)
TRACE: wpa: raw message: <3>P2P-FIND-STOPPED
DEBUG: supplicant: p2p-scanning stopped on wlp0s2f1u8
(supplicant_event_p2p_find_stopped() in
../../../src/wifi/wifid-supplicant.c:904)
TRACE: wpa: raw message: OK
TRACE: wpa: raw message: <3>P2P-GO-NEG-SUCCESS role=GO freq=2462
ht40=0 peer_dev=8e:79:67:11:22:33 peer_iface=8e:79:67:11:22:33
wps_method=PBC
DEBUG: supplicant: set STA-MAC for 8e:79:67:11:22:33 from <none> to
8e:79:67:11:22:33 (via GO-NEG-SUCCESS)
(supplicant_event_p2p_go_neg_success() in
../../../src/wifi/wifid-supplicant.c:1194)
TRACE: wpa: raw message: IFNAME=p2p-0 <3>Failed to start AP
functionality
DEBUG: supplicant: unhandled wpas-event: IFNAME=p2p-0 <3>Failed to
start AP functionality (supplicant_event() in
../../../src/wifi/wifid-supplicant.c:1498)
TRACE: wpa: raw message: <3>P2P-GROUP-FORMATION-FAILURE
DEBUG: supplicant: peer MY DEVICE connection failed
(supplicant_event_p2p_group_formation_failure() in
../../../src/wifi/wifid-supplicant.c:1318)
TRACE: wpa: raw message: <3>P2P-GROUP-REMOVED p2p-0 GO
reason=FORMATION_FAILED
DEBUG: supplicant: stray P2P-GROUP-REMOVED: <3>P2P-GROUP-REMOVED
p2p-0 GO reason=FORMATION_FAILED
(supplicant_event_p2p_group_removed() in
../../../src/wifi/wifid-supplicant.c:1286)
DEBUG: supplicant: sent P2P_FIND to wpas on wlp0s2f1u8
(supplicant_p2p_start_scan() in
../../../src/wifi/wifid-supplicant.c:2036)
TRACE: wpa: raw message: OK
DEBUG: supplicant: p2p-scanning now active on wlp0s2f1u8
(supplicant_p2p_find_fn() in ../../../src/wifi/wifid-supplicant.c:1917)
TRACE: wpa: raw message: IFNAME=wlp0s2f1u8 <3>CTRL-EVENT-SCAN-STARTED
...
Searching the web for similar problems leads to the following thread:
https://marc.info/?l=hostap&m=135336063022534
As suggested there, I have patched the Miraclecast sources to use the
wpa_supplicant configuration parameter p2p_no_group_iface=1.
So far, this works fine.
Regards,
Frank Schäfer
I finally managed to create extended logs and to compare the working
("GOOD") and non-working ("BAD") case.
See attachment.
If anything is missing, please let me know.
Hth,
Frank
Ok, this is what I can see happening in carl9170 with regards to the
interfaces:
1) 1 interface is added+initialized: NL80211_IFTYPE_STATION, p2p=false
(when miracle-wifid is started)
Non-working case (p2p_no_group_iface=0=default):
2a) 1 interface is added: NL80211_IFTYPE_STATION, p2p=true (apparently
the p2p group interface)
2b) 1 interface is removed: NL80211_IFTYPE_STATION, p2p=true (apparently
because setting of the interface flags failed with -EBUSY)
3) 1 interface is added+initialized: NL80211_IFTYPE_AP, p2p=true
=> fails with -EBUSY, because main_vif->p2p is false (main.c, line 656)
Working case (p2p_no_group_iface=1):
2) 1 interface is removed: NL80211_IFTYPE_STATION, p2p=false
3) 1 interface is added+initialized: NL80211_IFTYPE_AP, p2p=true
So if p2p_no_group_iface=1 is used, the initial STA non-p2p interface is
removed before a new AP+p2p interface is added.
Maybe the same needs to be done in case of p2p_no_group_iface=0 ?
Regards,
Frank
