iwlwifi: add remove station functionality

This patch adds remove station functionality, which is required for
5000 and AP mode.

There are still some gaps in managment that need to be closed but it
provides sufficient functionality for 5000 HW.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 150 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.c b/drivers/net/wireless/iwlwifi/iwl-sta.c
index 99ee1e14e29..11ec408f99c 100644
--- a/drivers/net/wireless/iwlwifi/iwl-sta.c
+++ b/drivers/net/wireless/iwlwifi/iwl-sta.c
@@ -37,6 +37,10 @@
 #include "iwl-io.h"
 #include "iwl-helpers.h"
 
+
+#define IWL_STA_DRIVER_ACTIVE		0x1     /* ucode entry is active */
+#define IWL_STA_UCODE_ACTIVE		0x2     /* ucode entry is active */
+
 u8 iwl_find_station(struct iwl_priv *priv, const u8 *addr)
 {
 	int i;
@@ -241,6 +245,152 @@ u8 iwl_add_station_flags(struct iwl_priv *priv, const u8 *addr, int is_ap,
 }
 EXPORT_SYMBOL(iwl_add_station_flags);
 
+
+static int iwl_sta_ucode_deactivate(struct iwl_priv *priv, const char *addr)
+{
+	unsigned long flags;
+	u8 sta_id;
+	DECLARE_MAC_BUF(mac);
+
+	sta_id = iwl_find_station(priv, addr);
+	if (sta_id != IWL_INVALID_STATION) {
+		IWL_DEBUG_ASSOC("Removed STA from Ucode: %s\n",
+				print_mac(mac, addr));
+		spin_lock_irqsave(&priv->sta_lock, flags);
+		priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
+		memset(&priv->stations[sta_id], 0,
+			sizeof(struct iwl_station_entry));
+		spin_unlock_irqrestore(&priv->sta_lock, flags);
+		return 0;
+	}
+	return -EINVAL;
+}
+
+static int iwl_remove_sta_callback(struct iwl_priv *priv,
+				   struct iwl_cmd *cmd, struct sk_buff *skb)
+{
+	struct iwl_rx_packet *res = NULL;
+	const char *addr = cmd->cmd.rm_sta.addr;
+
+	if (!skb) {
+		IWL_ERROR("Error: Response NULL in REPLY_REMOVE_STA.\n");
+		return 1;
+	}
+
+	res = (struct iwl_rx_packet *)skb->data;
+	if (res->hdr.flags & IWL_CMD_FAILED_MSK) {
+		IWL_ERROR("Bad return from REPLY_REMOVE_STA (0x%08X)\n",
+		res->hdr.flags);
+		return 1;
+	}
+
+	switch (res->u.rem_sta.status) {
+	case REM_STA_SUCCESS_MSK:
+		iwl_sta_ucode_deactivate(priv, addr);
+		break;
+	default:
+		break;
+	}
+
+	/* We didn't cache the SKB; let the caller free it */
+	return 1;
+}
+
+static int iwl_send_remove_station(struct iwl_priv *priv, const u8 *addr,
+				   u8 flags)
+{
+	struct iwl_rx_packet *res = NULL;
+	int ret;
+
+	struct iwl_rem_sta_cmd rm_sta_cmd;
+
+	struct iwl_host_cmd cmd = {
+		.id = REPLY_REMOVE_STA,
+		.len = sizeof(struct iwl_rem_sta_cmd),
+		.meta.flags = flags,
+		.data = &rm_sta_cmd,
+	};
+
+	memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
+	rm_sta_cmd.num_sta = 1;
+	memcpy(&rm_sta_cmd.addr, addr , ETH_ALEN);
+
+	if (flags & CMD_ASYNC)
+		cmd.meta.u.callback = iwl_remove_sta_callback;
+	else
+		cmd.meta.flags |= CMD_WANT_SKB;
+	ret = iwl_send_cmd(priv, &cmd);
+
+	if (ret || (flags & CMD_ASYNC))
+		return ret;
+
+	res = (struct iwl_rx_packet *)cmd.meta.u.skb->data;
+	if (res->hdr.flags & IWL_CMD_FAILED_MSK) {
+		IWL_ERROR("Bad return from REPLY_REMOVE_STA (0x%08X)\n",
+			  res->hdr.flags);
+		ret = -EIO;
+	}
+
+	if (!ret) {
+		switch (res->u.rem_sta.status) {
+		case REM_STA_SUCCESS_MSK:
+			iwl_sta_ucode_deactivate(priv, addr);
+			IWL_DEBUG_ASSOC("REPLY_REMOVE_STA PASSED\n");
+			break;
+		default:
+			ret = -EIO;
+			IWL_ERROR("REPLY_REMOVE_STA failed\n");
+			break;
+		}
+	}
+
+	priv->alloc_rxb_skb--;
+	dev_kfree_skb_any(cmd.meta.u.skb);
+
+	return ret;
+}
+/**
+ * iwl_remove_station - Remove driver's knowledge of station.
+ *
+ */
+u8 iwl_remove_station(struct iwl_priv *priv, const u8 *addr, int is_ap)
+{
+	int index = IWL_INVALID_STATION;
+	int i;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->sta_lock, flags);
+
+	if (is_ap)
+		index = IWL_AP_ID;
+	else if (is_broadcast_ether_addr(addr))
+		index = priv->hw_params.bcast_sta_id;
+	else
+		for (i = IWL_STA_ID; i < priv->hw_params.max_stations; i++)
+			if (priv->stations[i].used &&
+			    !compare_ether_addr(priv->stations[i].sta.sta.addr,
+						addr)) {
+				index = i;
+				break;
+			}
+
+	if (unlikely(index == IWL_INVALID_STATION))
+		goto out;
+
+	if (priv->stations[index].used) {
+		priv->stations[index].used = 0;
+		priv->num_stations--;
+	}
+
+	BUG_ON(priv->num_stations < 0);
+	spin_unlock_irqrestore(&priv->sta_lock, flags);
+	iwl_send_remove_station(priv, addr, CMD_ASYNC);
+	return index;
+out:
+	spin_unlock_irqrestore(&priv->sta_lock, flags);
+	return 0;
+}
+EXPORT_SYMBOL(iwl_remove_station);
 int iwl_get_free_ucode_key_index(struct iwl_priv *priv)
 {
 	int i;