mac80211: add flag to indicate HW only Tx-agg setup support

When this flag is set, Tx A-MPDU sessions will not be started by
mac80211. This flag is required for devices that support Tx A-MPDU setup
in hardware.

Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 11 insertions, 2 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 2e752df57510..5e5029b22ac7 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1096,6 +1096,10 @@ enum sta_notify_cmd {
  *      stations based on the PM bit of incoming frames.
  *      Use ieee80211_start_ps()/ieee8021_end_ps() to manually configure
  *      the PS mode of connected stations.
+ *
+ * @IEEE80211_HW_TX_AMPDU_SETUP_IN_HW: The device handles TX A-MPDU session
+ *      setup strictly in HW. mac80211 should not attempt to do this in
+ *      software.
  */
 enum ieee80211_hw_flags {
         IEEE80211_HW_HAS_RATE_CONTROL                   = 1<<0,
@@ -1121,6 +1125,7 @@ enum ieee80211_hw_flags {
         IEEE80211_HW_SUPPORTS_CQM_RSSI                  = 1<<20,
         IEEE80211_HW_SUPPORTS_PER_STA_GTK               = 1<<21,
         IEEE80211_HW_AP_LINK_PS                         = 1<<22,
+        IEEE80211_HW_TX_AMPDU_SETUP_IN_HW               = 1<<23,
 };
 
 /**
diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
index f10e1096c332..250b9a53f6d9 100644
--- a/net/mac80211/agg-tx.c
+++ b/net/mac80211/agg-tx.c
@@ -360,7 +360,8 @@ int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
                 return -EINVAL;
 
         if ((tid >= STA_TID_NUM) ||
-            !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION))
+            !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) ||
+            (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW))
                 return -EINVAL;
 
 #ifdef CONFIG_MAC80211_HT_DEBUG
diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 569609b94c8c..c9141168fd43 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -350,6 +350,8 @@ static ssize_t hwflags_read(struct file *file, char __user *user_buf,
                 sf += snprintf(buf + sf, mxln - sf, "SUPPORTS_PER_STA_GTK\n");
         if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
                 sf += snprintf(buf + sf, mxln - sf, "AP_LINK_PS\n");
+        if (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)
+                sf += snprintf(buf + sf, mxln - sf, "TX_AMPDU_SETUP_IN_HW\n");
 
         rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
         kfree(buf);
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index c9766ccb51a4..2521716aa97b 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1232,7 +1232,8 @@ ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
                 tx->sta = sta_info_get(sdata, hdr->addr1);
 
         if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
-            (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
+            (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
+            !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
                 struct tid_ampdu_tx *tid_tx;
 
                 qc = ieee80211_get_qos_ctl(hdr);