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To:     chunkeey@googlemail.com, j@w1.fi
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From:   =?UTF-8?Q?Frank_Sch=c3=a4fer?= <fschaefer.oss@googlemail.com>
Subject: [Bug] carl9170 + wpa_supplicant: P2P mode doesn't work with separate
 interfaces
Message-ID: <3a9d86b6-744f-e670-8792-9167257edef8@googlemail.com>
Date:   Sat, 18 Apr 2020 13:20:27 +0200
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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