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authorJohannes Berg <johannes.berg@intel.com>2016-03-31 20:02:10 +0300
committerJohannes Berg <johannes.berg@intel.com>2016-04-06 13:18:18 +0200
commit49ddf8e6e2347cffdcf83d1ca2d04ff929820178 (patch)
tree93ae97699c3abf8d47a1c4571dfdfb466c955df6 /net/mac80211/cfg.c
parent0f9c5a61d4b2330b12c59126aa5a9108dbfce555 (diff)
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mac80211: add fast-rx path
The regular RX path has a lot of code, but with a few assumptions on the hardware it's possible to reduce the amount of code significantly. Currently the assumptions on the driver are the following: * hardware/driver reordering buffer (if supporting aggregation) * hardware/driver decryption & PN checking (if using encryption) * hardware/driver did de-duplication * hardware/driver did A-MSDU deaggregation * AP_LINK_PS is used (in AP mode) * no client powersave handling in mac80211 (in client mode) of which some are actually checked per packet: * de-duplication * PN checking * decryption and additionally packets must * not be A-MSDU (have been deaggregated by driver/device) * be data packets * not be fragmented * be unicast * have RFC 1042 header Additionally dynamically we assume: * no encryption or CCMP/GCMP, TKIP/WEP/other not allowed * station must be authorized * 4-addr format not enabled Some data needed for the RX path is cached in a new per-station "fast_rx" structure, so that we only need to look at this and the packet, no other memory when processing packets on the fast RX path. After doing the above per-packet checks, the data path collapses down to a pretty simple conversion function taking advantage of the data cached in the small fast_rx struct. This should speed up the RX processing, and will make it easier to reason about parallelizing RX (for which statistics will need to be per-CPU still.) Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/cfg.c')
-rw-r--r--net/mac80211/cfg.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 62a90f270f03..fc4730b938d0 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -65,11 +65,13 @@ static int ieee80211_change_iface(struct wiphy *wiphy,
return ret;
if (type == NL80211_IFTYPE_AP_VLAN &&
- params && params->use_4addr == 0)
+ params && params->use_4addr == 0) {
RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
- else if (type == NL80211_IFTYPE_STATION &&
- params && params->use_4addr >= 0)
+ ieee80211_check_fast_rx_iface(sdata);
+ } else if (type == NL80211_IFTYPE_STATION &&
+ params && params->use_4addr >= 0) {
sdata->u.mgd.use_4addr = params->use_4addr;
+ }
if (sdata->vif.type == NL80211_IFTYPE_MONITOR && flags) {
struct ieee80211_local *local = sdata->local;
@@ -1367,6 +1369,7 @@ static int ieee80211_change_station(struct wiphy *wiphy,
rcu_assign_pointer(vlansdata->u.vlan.sta, sta);
new_4addr = true;
+ __ieee80211_check_fast_rx_iface(vlansdata);
}
if (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
@@ -1889,6 +1892,7 @@ static int ieee80211_change_bss(struct wiphy *wiphy,
sdata->flags |= IEEE80211_SDATA_DONT_BRIDGE_PACKETS;
else
sdata->flags &= ~IEEE80211_SDATA_DONT_BRIDGE_PACKETS;
+ ieee80211_check_fast_rx_iface(sdata);
}
if (params->ht_opmode >= 0) {