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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 14:18:18 +0300
commit49ddf8e6e2347cffdcf83d1ca2d04ff929820178 (patch)
tree93ae97699c3abf8d47a1c4571dfdfb466c955df6 /include
parent0f9c5a61d4b2330b12c59126aa5a9108dbfce555 (diff)
downloadlinux-49ddf8e6e2347cffdcf83d1ca2d04ff929820178.tar.xz
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 'include')
-rw-r--r--include/linux/ieee80211.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index bf9706c5b0bd..113bfc468a4d 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -638,6 +638,16 @@ static inline bool ieee80211_is_first_frag(__le16 seq_ctrl)
return (seq_ctrl & cpu_to_le16(IEEE80211_SCTL_FRAG)) == 0;
}
+/**
+ * ieee80211_is_frag - check if a frame is a fragment
+ * @hdr: 802.11 header of the frame
+ */
+static inline bool ieee80211_is_frag(struct ieee80211_hdr *hdr)
+{
+ return ieee80211_has_morefrags(hdr->frame_control) ||
+ hdr->seq_ctrl & cpu_to_le16(IEEE80211_SCTL_FRAG);
+}
+
struct ieee80211s_hdr {
u8 flags;
u8 ttl;