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authorMichal Kazior <michal.kazior@tieto.com>2013-09-23 13:34:38 (GMT)
committerJohannes Berg <johannes.berg@intel.com>2013-10-01 10:22:03 (GMT)
commit0cfcefef1945c6d3f24bce1c22937cfeae07eae8 (patch)
tree9fc8c7953e38b65832f831114df5fc0df7b83d97 /include/net/mac80211.h
parent15e230abaaa5a79feb25d1ef29b380e8b63aea0c (diff)
downloadlinux-0cfcefef1945c6d3f24bce1c22937cfeae07eae8.tar.xz
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>
Diffstat (limited to 'include/net/mac80211.h')
-rw-r--r--include/net/mac80211.h10
1 files changed, 10 insertions, 0 deletions
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 @@ ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info)
* @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 @@ enum mac80211_rx_flags {
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