mac80211: support reporting A-MSDU subframes individually
Some devices may not be able to report A-MSDUs in
single buffers. Drivers for such devices were
forced to re-assemble A-MSDUs which would then
be eventually disassembled by mac80211. This could
lead to CPU cache thrashing and poor performance.
Since A-MSDU has a single sequence number all
subframes share it. This was in conflict with
retransmission/duplication recovery
(IEEE802.11-2012: 9.3.2.10).
Patch introduces a new flag that is meant to be
set for all individually reported A-MSDU subframes
except the last one. This ensures the
last_seq_ctrl is updated after the last subframe
is processed. If an A-MSDU is actually a duplicate
transmission all reported subframes will be
properly discarded.
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
[johannes: add braces that were missing even before]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 8cff800..da80119 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -829,6 +829,15 @@
* @RX_FLAG_STBC_MASK: STBC 2 bit bitmask. 1 - Nss=1, 2 - Nss=2, 3 - Nss=3
* @RX_FLAG_10MHZ: 10 MHz (half channel) was used
* @RX_FLAG_5MHZ: 5 MHz (quarter channel) was used
+ * @RX_FLAG_AMSDU_MORE: Some drivers may prefer to report separate A-MSDU
+ * subframes instead of a one huge frame for performance reasons.
+ * All, but the last MSDU from an A-MSDU should have this flag set. E.g.
+ * if an A-MSDU has 3 frames, the first 2 must have the flag set, while
+ * the 3rd (last) one must not have this flag set. The flag is used to
+ * deal with retransmission/duplication recovery properly since A-MSDU
+ * subframes share the same sequence number. Reported subframes can be
+ * either regular MSDU or singly A-MSDUs. Subframes must not be
+ * interleaved with other frames.
*/
enum mac80211_rx_flags {
RX_FLAG_MMIC_ERROR = BIT(0),
@@ -859,6 +868,7 @@
RX_FLAG_STBC_MASK = BIT(26) | BIT(27),
RX_FLAG_10MHZ = BIT(28),
RX_FLAG_5MHZ = BIT(29),
+ RX_FLAG_AMSDU_MORE = BIT(30),
};
#define RX_FLAG_STBC_SHIFT 26