From: Amitkumar Karwar <akarwar@xxxxxxxxxxx>
After receiving channel switch announcement from AP, scan and
association on that channel is blocked for DFS_CHAN_MOVE_TIME
(10 seconds). Hence station will be able to connect to the AP,
once it is moved to new channel.
Signed-off-by: Amitkumar Karwar <akarwar@xxxxxxxxxxx>
Signed-off-by: Bing Zhao <bzhao@xxxxxxxxxxx>
Signed-off-by: Paul Stewart <pstew@xxxxxxxxxxxx>
---
drivers/net/wireless/mwifiex/fw.h | 2 ++
drivers/net/wireless/mwifiex/init.c | 3 +++
drivers/net/wireless/mwifiex/main.h | 20 ++++++++++++++++++++
drivers/net/wireless/mwifiex/scan.c | 18 ++++++++++++++++++
drivers/net/wireless/mwifiex/sta_event.c | 3 +++
drivers/net/wireless/mwifiex/sta_ioctl.c | 8 ++++++++
6 files changed, 54 insertions(+)
diff --git a/drivers/net/wireless/mwifiex/fw.h b/drivers/net/wireless/mwifiex/fw.h
index b6fbbf6..1b45aa5 100644
--- a/drivers/net/wireless/mwifiex/fw.h
+++ b/drivers/net/wireless/mwifiex/fw.h
@@ -245,6 +245,8 @@ enum MWIFIEX_802_11_PRIVACY_FILTER {
#define HT_BW_20 0
#define HT_BW_40 1
+#define DFS_CHAN_MOVE_TIME 10000
+
#define HostCmd_CMD_GET_HW_SPEC 0x0003
#define HostCmd_CMD_802_11_SCAN 0x0006
#define HostCmd_CMD_802_11_GET_LOG 0x000b
diff --git a/drivers/net/wireless/mwifiex/init.c b/drivers/net/wireless/mwifiex/init.c
index 2fe31dc..caaf4bd 100644
--- a/drivers/net/wireless/mwifiex/init.c
+++ b/drivers/net/wireless/mwifiex/init.c
@@ -133,6 +133,9 @@ int mwifiex_init_priv(struct mwifiex_private *priv)
priv->scan_block = false;
+ priv->csa_chan = 0;
+ priv->csa_expire_time = 0;
+
return mwifiex_add_bss_prio_tbl(priv);
}
diff --git a/drivers/net/wireless/mwifiex/main.h b/drivers/net/wireless/mwifiex/main.h
index 95a6f52..3da73d3 100644
--- a/drivers/net/wireless/mwifiex/main.h
+++ b/drivers/net/wireless/mwifiex/main.h
@@ -513,6 +513,8 @@ struct mwifiex_private {
u32 mgmt_frame_mask;
struct mwifiex_roc_cfg roc_cfg;
bool scan_aborting;
+ u8 csa_chan;
+ unsigned long csa_expire_time;
};
enum mwifiex_ba_status {
@@ -1021,6 +1023,24 @@ static inline bool mwifiex_is_skb_mgmt_frame(struct sk_buff *skb)
return (*(u32 *)skb->data == PKT_TYPE_MGMT);
}
+/* This function retrieves channel closed for operation by Channel
+ * Switch Announcement.
+ */
+static inline u8
+mwifiex_11h_get_csa_closed_channel(struct mwifiex_private *priv)
+{
+ if (!priv->csa_chan)
+ return 0;
+
+ /* Clear csa channel, if DFS channel move time has passed */
+ if (jiffies > priv->csa_expire_time) {
+ priv->csa_chan = 0;
+ priv->csa_expire_time = 0;
+ }
+
+ return priv->csa_chan;
+}
+
int mwifiex_init_shutdown_fw(struct mwifiex_private *priv,
u32 func_init_shutdown);
int mwifiex_add_card(void *, struct semaphore *, struct mwifiex_if_ops *, u8);
diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c
index 284d68b..c447d9b 100644
--- a/drivers/net/wireless/mwifiex/scan.c
+++ b/drivers/net/wireless/mwifiex/scan.c
@@ -575,6 +575,9 @@ mwifiex_scan_channel_list(struct mwifiex_private *priv,
return -1;
}
+ /* Check csa channel expiry before preparing scan list */
+ mwifiex_11h_get_csa_closed_channel(priv);
+
chan_tlv_out->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
/* Set the temp channel struct pointer to the start of the desired
@@ -604,6 +607,11 @@ mwifiex_scan_channel_list(struct mwifiex_private *priv,
while (tlv_idx < max_chan_per_scan &&
tmp_chan_list->chan_number && !done_early) {
+ if (tmp_chan_list->chan_number == priv->csa_chan) {
+ tmp_chan_list++;
+ continue;
+ }
+
dev_dbg(priv->adapter->dev,
"info: Scan: Chan(%3d), Radio(%d),"
" Mode(%d, %d), Dur(%d)\n",
@@ -1594,6 +1602,9 @@ int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
goto check_next_scan;
}
+ /* Check csa channel expiry before parsing scan response */
+ mwifiex_11h_get_csa_closed_channel(priv);
+
bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n",
bytes_left);
@@ -1746,6 +1757,13 @@ int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
struct ieee80211_channel *chan;
u8 band;
+ /* Skip entry if on csa closed channel */
+ if (channel == priv->csa_chan) {
+ dev_dbg(adapter->dev,
+ "Dropping entry on csa closed channel\n");
+ continue;
+ }
+
band = BAND_G;
if (chan_band_tlv) {
chan_band =
diff --git a/drivers/net/wireless/mwifiex/sta_event.c b/drivers/net/wireless/mwifiex/sta_event.c
index 0f7b4cf..8155471 100644
--- a/drivers/net/wireless/mwifiex/sta_event.c
+++ b/drivers/net/wireless/mwifiex/sta_event.c
@@ -429,6 +429,9 @@ int mwifiex_process_sta_event(struct mwifiex_private *priv)
case EVENT_CHANNEL_SWITCH_ANN:
dev_dbg(adapter->dev, "event: Channel Switch Announcement\n");
+ priv->csa_expire_time =
+ jiffies + msecs_to_jiffies(DFS_CHAN_MOVE_TIME);
+ priv->csa_chan = priv->curr_bss_params.bss_descriptor.channel;
ret = mwifiex_send_cmd_async(priv,
HostCmd_CMD_802_11_DEAUTHENTICATE,
HostCmd_ACT_GEN_SET, 0,
diff --git a/drivers/net/wireless/mwifiex/sta_ioctl.c b/drivers/net/wireless/mwifiex/sta_ioctl.c
index 498add7..206c3e0 100644
--- a/drivers/net/wireless/mwifiex/sta_ioctl.c
+++ b/drivers/net/wireless/mwifiex/sta_ioctl.c
@@ -281,6 +281,14 @@ int mwifiex_bss_start(struct mwifiex_private *priv, struct cfg80211_bss *bss,
if (ret)
goto done;
+ if (mwifiex_11h_get_csa_closed_channel(priv) ==
+ (u8)bss_desc->channel) {
+ dev_err(adapter->dev,
+ "Attempt to reconnect on csa closed chan(%d)\n",
+ bss_desc->channel);
+ goto done;
+ }
+
dev_dbg(adapter->dev, "info: SSID found in scan list ... "
"associating...\n");
--
1.8.2.3
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