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P2P: Use another interface operating channel as listen channel

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Performing a P2P Device flow such as p2p_listen or
p2p_find, can degrade the performance of an active interface
connection, if the listen frequency is different than the
frequency used by that interface.

To reduce the effect of P2P Device flows on other interfaces,
try changing the listen channel of the P2P Device to match the
operating channel of one of the other active interfaces. This change
will be possible only in case that the listen channel is not forced
externally, and will be delayed to a point where the P2P Device
state machine is idle.

The optimization can be configured in the configuration file and
is disabled by default.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
This commit is contained in:
Ilan Peer 2014-05-19 10:05:39 +03:00 • committed by Jouni Malinen
parent 28812a8983
commit e3bd6e9dc0
10 changed files with 132 additions and 6 deletions
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37
src/p2p/p2p.c
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@ -183,6 +183,14 @@ void p2p_set_state(struct p2p_data *p2p, int new_state)
p2p_dbg(p2p, "State %s -> %s",
p2p_state_txt(p2p->state), p2p_state_txt(new_state));
p2p->state = new_state;
if (new_state == P2P_IDLE && p2p->pending_channel) {
p2p_dbg(p2p, "Apply change in listen channel");
p2p->cfg->reg_class = p2p->pending_reg_class;
p2p->cfg->channel = p2p->pending_channel;
p2p->pending_reg_class = 0;
p2p->pending_channel = 0;
}
}
@ -3991,20 +3999,43 @@ void p2p_set_managed_oper(struct p2p_data *p2p, int enabled)
}
int p2p_set_listen_channel(struct p2p_data *p2p, u8 reg_class, u8 channel)
int p2p_set_listen_channel(struct p2p_data *p2p, u8 reg_class, u8 channel,
u8 forced)
{
if (p2p_channel_to_freq(reg_class, channel) < 0)
return -1;
p2p_dbg(p2p, "Set Listen channel: reg_class %u channel %u",
reg_class, channel);
p2p->cfg->reg_class = reg_class;
p2p->cfg->channel = channel;
/*
* Listen channel was set in configuration or set by control interface;
* cannot override it.
*/
if (p2p->cfg->channel_forced && forced == 0)
return -1;
if (p2p->state == P2P_IDLE) {
p2p->cfg->reg_class = reg_class;
p2p->cfg->channel = channel;
p2p->cfg->channel_forced = forced;
} else {
p2p_dbg(p2p, "Defer setting listen channel");
p2p->pending_reg_class = reg_class;
p2p->pending_channel = channel;
p2p->pending_channel_forced = forced;
}
return 0;
}
u8 p2p_get_listen_channel(struct p2p_data *p2p)
{
return p2p->cfg->channel;
}
int p2p_set_ssid_postfix(struct p2p_data *p2p, const u8 *postfix, size_t len)
{
p2p_dbg(p2p, "New SSID postfix: %s", wpa_ssid_txt(postfix, len));