iwlwifi: configure missed beacon threshold

Add support to configure missed beacon threshold, by default, if receive
"missed beacon" notification from uCode and has more than 5 consecutive
beacon missed, then perform sensitivity calibration; with this change,
allow user to adjust the missed beacon threshold from debugfs in case
more sensitivity calibration required for better performance in noisy
environment

The default value (=5) should be good enough for the normal condition,
but for very noisy environment, more sensitivity calibration could help
improve the throughput, so by setting the missed beacon threshold to
lower number, user might experience better performance result.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 62b6939df52e642a7d3a7d37278decd551277523..e9f786443d1f8db653f77aa1acb525747daf2b13 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -3372,6 +3372,7 @@ static int iwl_init_drv(struct iwl_priv *priv)
 
        priv->iw_mode = NL80211_IFTYPE_STATION;
        priv->current_ht_config.smps = IEEE80211_SMPS_STATIC;
+       priv->missed_beacon_threshold = IWL_MISSED_BEACON_THRESHOLD_DEF;
 
        /* Choose which receivers/antennas to use */
        if (priv->cfg->ops->hcmd->set_rxon_chain)

diff --git a/drivers/net/wireless/iwlwifi/iwl-commands.h b/drivers/net/wireless/iwlwifi/iwl-commands.h
index cee5fb2187c82162e9f4d7d40ce3bca475ad17a8..8823d18b9f4372b7cb1a2bcaeae0f356d2fececf 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-commands.h
+++ b/drivers/net/wireless/iwlwifi/iwl-commands.h
@@ -3165,13 +3165,30 @@ struct iwl_notif_statistics {
 
 /*
  * MISSED_BEACONS_NOTIFICATION = 0xa2 (notification only, not a command)
+ *
+ * uCode send MISSED_BEACONS_NOTIFICATION to driver when detect beacon missed
+ * in regardless of how many missed beacons, which mean when driver receive the
+ * notification, inside the command, it can find all the beacons information
+ * which include number of total missed beacons, number of consecutive missed
+ * beacons, number of beacons received and number of beacons expected to
+ * receive.
+ *
+ * If uCode detected consecutive_missed_beacons > 5, it will reset the radio
+ * in order to bring the radio/PHY back to working state; which has no relation
+ * to when driver will perform sensitivity calibration.
+ *
+ * Driver should set it own missed_beacon_threshold to decide when to perform
+ * sensitivity calibration based on number of consecutive missed beacons in
+ * order to improve overall performance, especially in noisy environment.
+ *
  */
-/* if ucode missed CONSECUTIVE_MISSED_BCONS_TH beacons in a row,
- * then this notification will be sent. */
-#define CONSECUTIVE_MISSED_BCONS_TH 20
+
+#define IWL_MISSED_BEACON_THRESHOLD_MIN        (1)
+#define IWL_MISSED_BEACON_THRESHOLD_DEF        (5)
+#define IWL_MISSED_BEACON_THRESHOLD_MAX        IWL_MISSED_BEACON_THRESHOLD_DEF
 
 struct iwl_missed_beacon_notif {
-       __le32 consequtive_missed_beacons;
+       __le32 consecutive_missed_beacons;
        __le32 total_missed_becons;
        __le32 num_expected_beacons;
        __le32 num_recvd_beacons;

diff --git a/drivers/net/wireless/iwlwifi/iwl-debug.h b/drivers/net/wireless/iwlwifi/iwl-debug.h
index 0facaca9b40b66125c467084f615d47b4056ebd4..36b558f23325fec635098308087a348d6d4262f3 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-debug.h
+++ b/drivers/net/wireless/iwlwifi/iwl-debug.h
@@ -112,6 +112,7 @@ struct iwl_debugfs {
                struct dentry *file_csr;
                struct dentry *file_ucode_tracing;
                struct dentry *file_fh_reg;
+               struct dentry *file_missed_beacon;
        } dbgfs_debug_files;
        u32 sram_offset;
        u32 sram_len;

diff --git a/drivers/net/wireless/iwlwifi/iwl-debugfs.c b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
index af00ad2afa1497569ee74e8b8d3144cbc62dd460..02f80bc21307c1dd86f8c233944645a72b572bbb 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-debugfs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
@@ -2131,6 +2131,49 @@ static ssize_t iwl_dbgfs_fh_reg_read(struct file *file,
        return ret;
 }
 
+static ssize_t iwl_dbgfs_missed_beacon_read(struct file *file,
+                                       char __user *user_buf,
+                                       size_t count, loff_t *ppos) {
+
+       struct iwl_priv *priv = file->private_data;
+       int pos = 0;
+       char buf[12];
+       const size_t bufsz = sizeof(buf);
+       ssize_t ret;
+
+       pos += scnprintf(buf + pos, bufsz - pos, "%d\n",
+                       priv->missed_beacon_threshold);
+
+       ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);
+       return ret;
+}
+
+static ssize_t iwl_dbgfs_missed_beacon_write(struct file *file,
+                                        const char __user *user_buf,
+                                        size_t count, loff_t *ppos)
+{
+       struct iwl_priv *priv = file->private_data;
+       char buf[8];
+       int buf_size;
+       int missed;
+
+       memset(buf, 0, sizeof(buf));
+       buf_size = min(count, sizeof(buf) -  1);
+       if (copy_from_user(buf, user_buf, buf_size))
+               return -EFAULT;
+       if (sscanf(buf, "%d", &missed) != 1)
+               return -EINVAL;
+
+       if (missed < IWL_MISSED_BEACON_THRESHOLD_MIN ||
+           missed > IWL_MISSED_BEACON_THRESHOLD_MAX)
+               priv->missed_beacon_threshold =
+                       IWL_MISSED_BEACON_THRESHOLD_DEF;
+       else
+               priv->missed_beacon_threshold = missed;
+
+       return count;
+}
+
 DEBUGFS_READ_FILE_OPS(rx_statistics);
 DEBUGFS_READ_FILE_OPS(tx_statistics);
 DEBUGFS_READ_WRITE_FILE_OPS(traffic_log);
@@ -2148,6 +2191,7 @@ DEBUGFS_WRITE_FILE_OPS(clear_traffic_statistics);
 DEBUGFS_WRITE_FILE_OPS(csr);
 DEBUGFS_READ_WRITE_FILE_OPS(ucode_tracing);
 DEBUGFS_READ_FILE_OPS(fh_reg);
+DEBUGFS_READ_WRITE_FILE_OPS(missed_beacon);
 
 /*
  * Create the debugfs files and directories
@@ -2200,6 +2244,7 @@ int iwl_dbgfs_register(struct iwl_priv *priv, const char *name)
        DEBUGFS_ADD_FILE(clear_traffic_statistics, debug, S_IWUSR);
        DEBUGFS_ADD_FILE(csr, debug, S_IWUSR);
        DEBUGFS_ADD_FILE(fh_reg, debug, S_IRUSR);
+       DEBUGFS_ADD_FILE(missed_beacon, debug, S_IWUSR);
        if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) != CSR_HW_REV_TYPE_3945) {
                DEBUGFS_ADD_FILE(ucode_rx_stats, debug, S_IRUSR);
                DEBUGFS_ADD_FILE(ucode_tx_stats, debug, S_IRUSR);
@@ -2260,6 +2305,7 @@ void iwl_dbgfs_unregister(struct iwl_priv *priv)
                        file_clear_traffic_statistics);
        DEBUGFS_REMOVE(priv->dbgfs->dbgfs_debug_files.file_csr);
        DEBUGFS_REMOVE(priv->dbgfs->dbgfs_debug_files.file_fh_reg);
+       DEBUGFS_REMOVE(priv->dbgfs->dbgfs_debug_files.file_missed_beacon);
        if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) != CSR_HW_REV_TYPE_3945) {
                DEBUGFS_REMOVE(priv->dbgfs->dbgfs_debug_files.
                        file_ucode_rx_stats);

diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index c6310b0b2f122c9e4340531343cee834355d56cf..5e06e666f1767c2af2a3d295c8534bef25d7ec86 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -1053,6 +1053,7 @@ struct iwl_priv {
 #endif
        /* ucode beacon time */
        u32 ucode_beacon_time;
+       int missed_beacon_threshold;
 
        /* we allocate array of iwl4965_channel_info for NIC's valid channels.
         *    Access via channel # using indirect index array */

diff --git a/drivers/net/wireless/iwlwifi/iwl-rx.c b/drivers/net/wireless/iwlwifi/iwl-rx.c
index eb45f8be0746bc66eec6476e0102464b65b007a9..dc06c7bb0f5c78755e81399b6304b9960ce3ee34 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-rx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-rx.c
@@ -499,9 +499,10 @@ void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
        struct iwl_missed_beacon_notif *missed_beacon;
 
        missed_beacon = &pkt->u.missed_beacon;
-       if (le32_to_cpu(missed_beacon->consequtive_missed_beacons) > 5) {
+       if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
+           priv->missed_beacon_threshold) {
                IWL_DEBUG_CALIB(priv, "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
-                   le32_to_cpu(missed_beacon->consequtive_missed_beacons),
+                   le32_to_cpu(missed_beacon->consecutive_missed_beacons),
                    le32_to_cpu(missed_beacon->total_missed_becons),
                    le32_to_cpu(missed_beacon->num_recvd_beacons),
                    le32_to_cpu(missed_beacon->num_expected_beacons));

diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c
index c46f988d0a5b57a3c526f84936a4542e67b6a45b..9c0b6ebbdc593368371de823e349164fa4b81d28 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -3881,6 +3881,7 @@ static int iwl3945_init_drv(struct iwl_priv *priv)
        priv->band = IEEE80211_BAND_2GHZ;
 
        priv->iw_mode = NL80211_IFTYPE_STATION;
+       priv->missed_beacon_threshold = IWL_MISSED_BEACON_THRESHOLD_DEF;
 
        iwl_reset_qos(priv);