diff options
author | sam <sam@FreeBSD.org> | 2007-03-07 04:42:22 +0000 |
---|---|---|
committer | sam <sam@FreeBSD.org> | 2007-03-07 04:42:22 +0000 |
commit | 519f61f9957d9a7307fe381d04f1ae9ebbf6137f (patch) | |
tree | 783d971edc20e5ec5dd605945b690d9232c36062 /sys/net80211/ieee80211_input.c | |
parent | 24d9d9d38048472a526ad8fd061b7e5d587ac709 (diff) | |
download | FreeBSD-src-519f61f9957d9a7307fe381d04f1ae9ebbf6137f.zip FreeBSD-src-519f61f9957d9a7307fe381d04f1ae9ebbf6137f.tar.gz |
When dispatching frames saved on the power save queue to a
station exiting power save mode prepend them to the driver's
send q instead of appending them. This insures the packets
are not misordered wrt any packets already q'd for the station.
This corrects a problem noticed when using a VoIP phone talking
to an ath card in ap mode; the misordered packets caused noise.
Submitted by: "J.R. Oldroyd" <jr@opal.com>
MFC after: 2 weeks
Diffstat (limited to 'sys/net80211/ieee80211_input.c')
-rw-r--r-- | sys/net80211/ieee80211_input.c | 36 |
1 files changed, 23 insertions, 13 deletions
diff --git a/sys/net80211/ieee80211_input.c b/sys/net80211/ieee80211_input.c index 9c3d609..2517edd 100644 --- a/sys/net80211/ieee80211_input.c +++ b/sys/net80211/ieee80211_input.c @@ -2633,7 +2633,8 @@ static void ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable) { struct ieee80211com *ic = ni->ni_ic; - struct mbuf *m; + struct mbuf *m, *mhead, *mtail; + int mcount; if (enable) { if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) @@ -2664,23 +2665,32 @@ ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable) IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, "[%s] flush ps queue, %u packets queued\n", ether_sprintf(ni->ni_macaddr), IEEE80211_NODE_SAVEQ_QLEN(ni)); + /* + * Unload the frames from the ps q but don't send them + * to the driver yet. We do this in two stages to minimize + * locking but also because there's no easy way to preserve + * ordering given the existing ifnet access mechanisms. + * XXX could be optimized + */ + IEEE80211_NODE_SAVEQ_LOCK(ni); + mcount = IEEE80211_NODE_SAVEQ_QLEN(ni); + mhead = mtail = NULL; for (;;) { - int qlen; - - IEEE80211_NODE_SAVEQ_DEQUEUE(ni, m, qlen); + _IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m); if (m == NULL) break; - /* - * If this is the last packet, turn off the TIM bit. - * If there are more packets, set the more packets bit - * in the mbuf so ieee80211_encap will mark the 802.11 - * head to indicate more data frames will follow. - */ - if (qlen != 0) - m->m_flags |= M_MORE_DATA; + if (mhead == NULL) { + mhead = m; + m->m_nextpkt = NULL; + } else + mtail->m_nextpkt = m; + mtail = m; + } + IEEE80211_NODE_SAVEQ_UNLOCK(ni); + if (mhead != NULL) { /* XXX need different driver interface */ /* XXX bypasses q max */ - IF_ENQUEUE(&ic->ic_ifp->if_snd, m); + IF_PREPEND_LIST(&ic->ic_ifp->if_snd, mhead, mtail, mcount); } if (ic->ic_set_tim != NULL) ic->ic_set_tim(ni, 0); |