diff options
author | Johannes Berg <johannes.berg@intel.com> | 2016-03-31 20:02:10 +0300 |
---|---|---|
committer | Johannes Berg <johannes.berg@intel.com> | 2016-04-06 13:18:18 +0200 |
commit | 49ddf8e6e2347cffdcf83d1ca2d04ff929820178 (patch) | |
tree | 93ae97699c3abf8d47a1c4571dfdfb466c955df6 /net/mac80211/sta_info.h | |
parent | 0f9c5a61d4b2330b12c59126aa5a9108dbfce555 (diff) |
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/sta_info.h')
-rw-r--r-- | net/mac80211/sta_info.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h index 7c23b575672e..a0a06609338d 100644 --- a/net/mac80211/sta_info.h +++ b/net/mac80211/sta_info.h @@ -286,6 +286,38 @@ struct ieee80211_fast_tx { }; /** + * struct ieee80211_fast_rx - RX fastpath information + * @dev: netdevice for reporting the SKB + * @vif_type: (P2P-less) interface type of the original sdata (sdata->vif.type) + * @vif_addr: interface address + * @rfc1042_hdr: copy of the RFC 1042 SNAP header (to have in cache) + * @control_port_protocol: control port protocol copied from sdata + * @expected_ds_bits: from/to DS bits expected + * @icv_len: length of the MIC if present + * @key: bool indicating encryption is expected (key is set) + * @sta_notify: notify the MLME code (once) + * @internal_forward: forward froms internally on AP/VLAN type interfaces + * @da_offs: offset of the DA in the header (for header conversion) + * @sa_offs: offset of the SA in the header (for header conversion) + * @rcu_head: RCU head for freeing this structure + */ +struct ieee80211_fast_rx { + struct net_device *dev; + enum nl80211_iftype vif_type; + u8 vif_addr[ETH_ALEN] __aligned(2); + u8 rfc1042_hdr[6] __aligned(2); + __be16 control_port_protocol; + __le16 expected_ds_bits; + u8 icv_len; + u8 key:1, + sta_notify:1, + internal_forward:1; + u8 da_offs, sa_offs; + + struct rcu_head rcu_head; +}; + +/** * struct mesh_sta - mesh STA information * @plink_lock: serialize access to plink fields * @llid: Local link ID @@ -391,6 +423,7 @@ DECLARE_EWMA(signal, 1024, 8) * @cipher_scheme: optional cipher scheme for this station * @reserved_tid: reserved TID (if any, otherwise IEEE80211_TID_UNRESERVED) * @fast_tx: TX fastpath information + * @fast_rx: RX fastpath information * @tdls_chandef: a TDLS peer can have a wider chandef that is compatible to * the BSS one. * @tx_stats: TX statistics @@ -414,6 +447,7 @@ struct sta_info { spinlock_t lock; struct ieee80211_fast_tx __rcu *fast_tx; + struct ieee80211_fast_rx __rcu *fast_rx; #ifdef CONFIG_MAC80211_MESH struct mesh_sta *mesh; |