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author | Johannes Berg <johannes.berg@intel.com> | 2016-03-31 20:02:10 +0300 |
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committer | Johannes Berg <johannes.berg@intel.com> | 2016-04-06 14:18:18 +0300 |
commit | 49ddf8e6e2347cffdcf83d1ca2d04ff929820178 (patch) | |
tree | 93ae97699c3abf8d47a1c4571dfdfb466c955df6 /include | |
parent | 0f9c5a61d4b2330b12c59126aa5a9108dbfce555 (diff) | |
download | linux-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.h | 10 |
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; |