mac80211: A-MPDU add debugfs support

This patch adds A-MPDU status report per STA to the debugfs.
The option to de/activate A-MPDU through debugfs is also present.

Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 117 insertions, 0 deletions

diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c
index 8f5944c53d4e..df25abf63137 100644
--- a/net/mac80211/debugfs_sta.c
+++ b/net/mac80211/debugfs_sta.c
@@ -55,6 +55,13 @@ static const struct file_operations sta_ ##name## _ops = {		\
         .open = mac80211_open_file_generic,                             \
 }
 
+#define STA_OPS_WR(name)                                                \
+static const struct file_operations sta_ ##name## _ops = {              \
+        .read = sta_##name##_read,                                      \
+        .write = sta_##name##_write,                                    \
+        .open = mac80211_open_file_generic,                             \
+}
+
 #define STA_FILE(name, field, format)                                   \
                 STA_READ_##format(name, field)                          \
                 STA_OPS(name)
@@ -191,6 +198,113 @@ static ssize_t sta_wme_tx_queue_read(struct file *file, char __user *userbuf,
 STA_OPS(wme_tx_queue);
 #endif
 
+static ssize_t sta_agg_status_read(struct file *file, char __user *userbuf,
+                                        size_t count, loff_t *ppos)
+{
+        char buf[768], *p = buf;
+        int i;
+        struct sta_info *sta = file->private_data;
+        p += scnprintf(p, sizeof(buf)+buf-p, "Agg state for STA is:\n");
+        p += scnprintf(p, sizeof(buf)+buf-p, " STA next dialog_token is %d \n "
+                        "TIDs info is: \n TID :",
+                        (sta->ampdu_mlme.dialog_token_allocator + 1));
+        for (i = 0; i < STA_TID_NUM; i++)
+                p += scnprintf(p, sizeof(buf)+buf-p, "%5d", i);
+
+        p += scnprintf(p, sizeof(buf)+buf-p, "\n RX  :");
+        for (i = 0; i < STA_TID_NUM; i++)
+                p += scnprintf(p, sizeof(buf)+buf-p, "%5d",
+        sta->ampdu_mlme.tid_rx[i].state);
+
+        p += scnprintf(p, sizeof(buf)+buf-p, "\n DTKN:");
+        for (i = 0; i < STA_TID_NUM; i++)
+                p += scnprintf(p, sizeof(buf)+buf-p, "%5d",
+                        sta->ampdu_mlme.tid_rx[i].dialog_token);
+
+        p += scnprintf(p, sizeof(buf)+buf-p, "\n TX  :");
+        for (i = 0; i < STA_TID_NUM; i++)
+                p += scnprintf(p, sizeof(buf)+buf-p, "%5d",
+                        sta->ampdu_mlme.tid_tx[i].state);
+
+        p += scnprintf(p, sizeof(buf)+buf-p, "\n DTKN:");
+        for (i = 0; i < STA_TID_NUM; i++)
+                p += scnprintf(p, sizeof(buf)+buf-p, "%5d",
+                        sta->ampdu_mlme.tid_tx[i].dialog_token);
+
+        p += scnprintf(p, sizeof(buf)+buf-p, "\n SSN :");
+        for (i = 0; i < STA_TID_NUM; i++)
+                p += scnprintf(p, sizeof(buf)+buf-p, "%5d",
+                        sta->ampdu_mlme.tid_tx[i].ssn);
+
+        p += scnprintf(p, sizeof(buf)+buf-p, "\n");
+
+        return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
+}
+
+static ssize_t sta_agg_status_write(struct file *file,
+                const char __user *user_buf, size_t count, loff_t *ppos)
+{
+        struct sta_info *sta = file->private_data;
+        struct net_device *dev = sta->dev;
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+        struct ieee80211_hw *hw = &local->hw;
+        u8 *da = sta->addr;
+        static int tid_static_tx[16] = {0, 0, 0, 0, 0, 0, 0, 0,
+                                        0, 0, 0, 0, 0, 0, 0, 0};
+        static int tid_static_rx[16] = {1, 1, 1, 1, 1, 1, 1, 1,
+                                        1, 1, 1, 1, 1, 1, 1, 1};
+        char *endp;
+        char buf[32];
+        int buf_size, rs;
+        unsigned int tid_num;
+        char state[4];
+
+        memset(buf, 0x00, sizeof(buf));
+        buf_size = min(count, (sizeof(buf)-1));
+        if (copy_from_user(buf, user_buf, buf_size))
+                return -EFAULT;
+
+        tid_num = simple_strtoul(buf, &endp, 0);
+        if (endp == buf)
+                return -EINVAL;
+
+        if ((tid_num >= 100) && (tid_num <= 115)) {
+                /* toggle Rx aggregation command */
+                tid_num = tid_num - 100;
+                if (tid_static_rx[tid_num] == 1) {
+                        strcpy(state, "off ");
+                        ieee80211_sta_stop_rx_ba_session(dev, da, tid_num, 0,
+                                        WLAN_REASON_QSTA_REQUIRE_SETUP);
+                        sta->ampdu_mlme.tid_rx[tid_num].buf_size = 0xFF;
+                        tid_static_rx[tid_num] = 0;
+                } else {
+                        strcpy(state, "on ");
+                        sta->ampdu_mlme.tid_rx[tid_num].buf_size = 0x00;
+                        tid_static_rx[tid_num] = 1;
+                }
+                printk(KERN_DEBUG "debugfs - try switching tid %u %s\n",
+                                tid_num, state);
+        } else if ((tid_num >= 0) && (tid_num <= 15)) {
+                /* toggle Tx aggregation command */
+                if (tid_static_tx[tid_num] == 0) {
+                        strcpy(state, "on ");
+                        rs =  ieee80211_start_tx_ba_session(hw, da, tid_num);
+                        if (rs == 0)
+                                tid_static_tx[tid_num] = 1;
+                } else {
+                        strcpy(state, "off");
+                        rs =  ieee80211_stop_tx_ba_session(hw, da, tid_num, 1);
+                        if (rs == 0)
+                                tid_static_tx[tid_num] = 0;
+                }
+                printk(KERN_DEBUG "debugfs - switching tid %u %s, return=%d\n",
+                                tid_num, state, rs);
+        }
+
+        return count;
+}
+STA_OPS_WR(agg_status);
+
 #define DEBUGFS_ADD(name) \
         sta->debugfs.name = debugfs_create_file(#name, 0444, \
                 sta->debugfs.dir, sta, &sta_ ##name## _ops);
@@ -224,6 +338,7 @@ void ieee80211_sta_debugfs_add(struct sta_info *sta)
         DEBUGFS_ADD(wme_rx_queue);
         DEBUGFS_ADD(wme_tx_queue);
 #endif
+        DEBUGFS_ADD(agg_status);
 }
 
 void ieee80211_sta_debugfs_remove(struct sta_info *sta)
@@ -238,6 +353,7 @@ void ieee80211_sta_debugfs_remove(struct sta_info *sta)
         DEBUGFS_DEL(wme_rx_queue);
         DEBUGFS_DEL(wme_tx_queue);
 #endif
+        DEBUGFS_DEL(agg_status);
 
         debugfs_remove(sta->debugfs.dir);
         sta->debugfs.dir = NULL;
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index 48a620a4e1a6..75573dc79d7a 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -192,6 +192,7 @@ struct sta_info {
                 struct dentry *wme_rx_queue;
                 struct dentry *wme_tx_queue;
 #endif
+                struct dentry *agg_status;
         } debugfs;
 #endif
 };