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authorJohannes Berg <johannes.berg@intel.com>2015-03-21 15:25:43 +0100
committerJohannes Berg <johannes.berg@intel.com>2015-04-22 10:02:25 +0200
commit17c18bf880b2464851e5a2bca86521affc46c97e (patch)
tree3b200b80b2f494fe2084472204a93c4c51bc55b0 /net/mac80211/sta_info.h
parenta839e463e84a02c0ea65ff61504b56a83e193078 (diff)
downloadlinux-sh-17c18bf880b2464851e5a2bca86521affc46c97e.tar.gz
mac80211: add TX fastpath
In order to speed up mac80211's TX path, add the "fast-xmit" cache that will cache the data frame 802.11 header and other data to be able to build the frame more quickly. This cache is rebuilt when external triggers imply changes, but a lot of the checks done per packet today are simplified away to the check for the cache. There's also a more detailed description in the code. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/sta_info.h')
-rw-r--r--net/mac80211/sta_info.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index e4c4f871ffee..0602363ff63b 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -242,6 +242,30 @@ struct sta_ampdu_mlme {
#define IEEE80211_TID_UNRESERVED 0xff
/**
+ * struct ieee80211_fast_tx - TX fastpath information
+ * @key: key to use for hw crypto
+ * @hdr: the 802.11 header to put with the frame
+ * @hdr_len: actual 802.11 header length
+ * @sa_offs: offset of the SA
+ * @da_offs: offset of the DA
+ * @pn_offs: offset where to put PN for crypto (or 0 if not needed)
+ * @band: band this will be transmitted on, for tx_info
+ * @rcu_head: RCU head to free this struct
+ *
+ * Try to keep this struct small so it fits into a single cacheline.
+ */
+struct ieee80211_fast_tx {
+ struct ieee80211_key *key;
+ u8 hdr[30 + 2 + IEEE80211_CCMP_HDR_LEN +
+ sizeof(rfc1042_header)];
+ u8 hdr_len;
+ u8 sa_offs, da_offs, pn_offs;
+ u8 band;
+
+ struct rcu_head rcu_head;
+};
+
+/**
* struct sta_info - STA information
*
* This structure collects information about a station that
@@ -339,6 +363,7 @@ struct sta_ampdu_mlme {
* using IEEE80211_NUM_TID entry for non-QoS frames
* @rx_msdu: MSDUs received from this station, using IEEE80211_NUM_TID
* entry for non-QoS frames
+ * @fast_tx: TX fastpath information
*/
struct sta_info {
/* General information, mostly static */
@@ -356,6 +381,8 @@ struct sta_info {
spinlock_t rate_ctrl_lock;
spinlock_t lock;
+ struct ieee80211_fast_tx __rcu *fast_tx;
+
struct work_struct drv_deliver_wk;
u16 listen_interval;