Commit f4d57941 authored May 28, 2013 by Johannes Berg

mac80211: always send multicast on CAB queue



If the driver advertised support for a CAB queue, then we
should put all multicast frames there, otherwise sending
them can be racy with clients going to sleep while we TX
a frame. To avoid this, always TX multicast frames on the
multicast queue.

It seems like even drivers not using the queue framework
might want to do this which would mean also moving the
IEEE80211_TX_CTL_SEND_AFTER_DTIM flag assignment, but it
also seems that drivers behave differently here so that
just moving it wouldn't be a good idea. It'd be better to
modify those drivers to use the queue framework.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

parent bd5e14fb

net/mac80211/tx.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -398,13 +398,14 @@ ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
		if (ieee80211_has_order(hdr->frame_control))
		return TX_CONTINUE;

		if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
		info->hw_queue = tx->sdata->vif.cab_queue;

		/* no stations in PS mode */
		if (!atomic_read(&ps->num_sta_ps))
		return TX_CONTINUE;

		info->flags \|= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
		if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
		info->hw_queue = tx->sdata->vif.cab_queue;

		/* device releases frame after DTIM beacon */
		if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))

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