1 files changed, 437 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/mvm/scan.c b/drivers/net/wireless/iwlwifi/mvm/scan.c
new file mode 100644
index 00000000000..406c53ad0a4
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/mvm/scan.c
@@ -0,0 +1,437 @@
+/******************************************************************************
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
+ * USA
+ *
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * Contact Information:
+ *  Intel Linux Wireless <ilw@linux.intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  * Neither the name Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+
+#include <linux/etherdevice.h>
+#include <net/mac80211.h>
+
+#include "mvm.h"
+#include "iwl-eeprom-parse.h"
+#include "fw-api-scan.h"
+
+#define IWL_PLCP_QUIET_THRESH 1
+#define IWL_ACTIVE_QUIET_TIME 10
+
+static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
+{
+	u16 rx_chain;
+	u8 rx_ant = mvm->nvm_data->valid_rx_ant;
+
+	rx_chain = rx_ant << PHY_RX_CHAIN_VALID_POS;
+	rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_MIMO_SEL_POS;
+	rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_SEL_POS;
+	rx_chain |= 0x1 << PHY_RX_CHAIN_DRIVER_FORCE_POS;
+	return cpu_to_le16(rx_chain);
+}
+
+static inline __le32 iwl_mvm_scan_max_out_time(struct ieee80211_vif *vif)
+{
+	if (vif->bss_conf.assoc)
+		return cpu_to_le32(200 * 1024);
+	else
+		return 0;
+}
+
+static inline __le32 iwl_mvm_scan_suspend_time(struct ieee80211_vif *vif)
+{
+	if (vif->bss_conf.assoc)
+		return cpu_to_le32(vif->bss_conf.beacon_int);
+	else
+		return 0;
+}
+
+static inline __le32
+iwl_mvm_scan_rxon_flags(struct cfg80211_scan_request *req)
+{
+	if (req->channels[0]->band == IEEE80211_BAND_2GHZ)
+		return cpu_to_le32(PHY_BAND_24);
+	else
+		return cpu_to_le32(PHY_BAND_5);
+}
+
+static inline __le32
+iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum ieee80211_band band,
+			  bool no_cck)
+{
+	u32 tx_ant;
+
+	mvm->scan_last_antenna_idx =
+		iwl_mvm_next_antenna(mvm, mvm->nvm_data->valid_tx_ant,
+				     mvm->scan_last_antenna_idx);
+	tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;
+
+	if (band == IEEE80211_BAND_2GHZ && !no_cck)
+		return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
+				   tx_ant);
+	else
+		return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
+}
+
+/*
+ * We insert the SSIDs in an inverted order, because the FW will
+ * invert it back. The most prioritized SSID, which is first in the
+ * request list, is not copied here, but inserted directly to the probe
+ * request.
+ */
+static void iwl_mvm_scan_fill_ssids(struct iwl_scan_cmd *cmd,
+				    struct cfg80211_scan_request *req)
+{
+	int fw_idx, req_idx;
+
+	fw_idx = 0;
+	for (req_idx = req->n_ssids - 1; req_idx > 0; req_idx--) {
+		cmd->direct_scan[fw_idx].id = WLAN_EID_SSID;
+		cmd->direct_scan[fw_idx].len = req->ssids[req_idx].ssid_len;
+		memcpy(cmd->direct_scan[fw_idx].ssid,
+		       req->ssids[req_idx].ssid,
+		       req->ssids[req_idx].ssid_len);
+	}
+}
+
+/*
+ * If req->n_ssids > 0, it means we should do an active scan.
+ * In case of active scan w/o directed scan, we receive a zero-length SSID
+ * just to notify that this scan is active and not passive.
+ * In order to notify the FW of the number of SSIDs we wish to scan (including
+ * the zero-length one), we need to set the corresponding bits in chan->type,
+ * one for each SSID, and set the active bit (first).
+ */
+static u16 iwl_mvm_get_active_dwell(enum ieee80211_band band, int n_ssids)
+{
+	if (band == IEEE80211_BAND_2GHZ)
+		return 30  + 3 * (n_ssids + 1);
+	return 20  + 2 * (n_ssids + 1);
+}
+
+static u16 iwl_mvm_get_passive_dwell(enum ieee80211_band band)
+{
+	return band == IEEE80211_BAND_2GHZ ? 100 + 20 : 100 + 10;
+}
+
+static void iwl_mvm_scan_fill_channels(struct iwl_scan_cmd *cmd,
+				       struct cfg80211_scan_request *req)
+{
+	u16 passive_dwell = iwl_mvm_get_passive_dwell(req->channels[0]->band);
+	u16 active_dwell = iwl_mvm_get_active_dwell(req->channels[0]->band,
+						    req->n_ssids);
+	struct iwl_scan_channel *chan = (struct iwl_scan_channel *)
+		(cmd->data + le16_to_cpu(cmd->tx_cmd.len));
+	int i;
+	__le32 chan_type_value;
+
+	if (req->n_ssids > 0)
+		chan_type_value = cpu_to_le32(BIT(req->n_ssids + 1) - 1);
+	else
+		chan_type_value = SCAN_CHANNEL_TYPE_PASSIVE;
+
+	for (i = 0; i < cmd->channel_count; i++) {
+		chan->channel = cpu_to_le16(req->channels[i]->hw_value);
+		if (req->channels[i]->flags & IEEE80211_CHAN_PASSIVE_SCAN)
+			chan->type = SCAN_CHANNEL_TYPE_PASSIVE;
+		else
+			chan->type = chan_type_value;
+		chan->active_dwell = cpu_to_le16(active_dwell);
+		chan->passive_dwell = cpu_to_le16(passive_dwell);
+		chan->iteration_count = cpu_to_le16(1);
+		chan++;
+	}
+}
+
+/*
+ * Fill in probe request with the following parameters:
+ * TA is our vif HW address, which mac80211 ensures we have.
+ * Packet is broadcasted, so this is both SA and DA.
+ * The probe request IE is made out of two: first comes the most prioritized
+ * SSID if a directed scan is requested. Second comes whatever extra
+ * information was given to us as the scan request IE.
+ */
+static u16 iwl_mvm_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
+				  int n_ssids, const u8 *ssid, int ssid_len,
+				  const u8 *ie, int ie_len,
+				  int left)
+{
+	int len = 0;
+	u8 *pos = NULL;
+
+	/* Make sure there is enough space for the probe request,
+	 * two mandatory IEs and the data */
+	left -= 24;
+	if (left < 0)
+		return 0;
+
+	frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
+	eth_broadcast_addr(frame->da);
+	memcpy(frame->sa, ta, ETH_ALEN);
+	eth_broadcast_addr(frame->bssid);
+	frame->seq_ctrl = 0;
+
+	len += 24;
+
+	/* for passive scans, no need to fill anything */
+	if (n_ssids == 0)
+		return (u16)len;
+
+	/* points to the payload of the request */
+	pos = &frame->u.probe_req.variable[0];
+
+	/* fill in our SSID IE */
+	left -= ssid_len + 2;
+	if (left < 0)
+		return 0;
+	*pos++ = WLAN_EID_SSID;
+	*pos++ = ssid_len;
+	if (ssid && ssid_len) { /* ssid_len may be == 0 even if ssid is valid */
+		memcpy(pos, ssid, ssid_len);
+		pos += ssid_len;
+	}
+
+	len += ssid_len + 2;
+
+	if (WARN_ON(left < ie_len))
+		return len;
+
+	if (ie && ie_len) {
+		memcpy(pos, ie, ie_len);
+		len += ie_len;
+	}
+
+	return (u16)len;
+}
+
+int iwl_mvm_scan_request(struct iwl_mvm *mvm,
+			 struct ieee80211_vif *vif,
+			 struct cfg80211_scan_request *req)
+{
+	struct iwl_host_cmd hcmd = {
+		.id = SCAN_REQUEST_CMD,
+		.len = { 0, },
+		.data = { mvm->scan_cmd, },
+		.flags = CMD_SYNC,
+		.dataflags = { IWL_HCMD_DFL_NOCOPY, },
+	};
+	struct iwl_scan_cmd *cmd = mvm->scan_cmd;
+	int ret;
+	u32 status;
+	int ssid_len = 0;
+	u8 *ssid = NULL;
+
+	lockdep_assert_held(&mvm->mutex);
+	BUG_ON(mvm->scan_cmd == NULL);
+
+	IWL_DEBUG_SCAN(mvm, "Handling mac80211 scan request\n");
+	mvm->scan_status = IWL_MVM_SCAN_OS;
+	memset(cmd, 0, sizeof(struct iwl_scan_cmd) +
+	       mvm->fw->ucode_capa.max_probe_length +
+	       (MAX_NUM_SCAN_CHANNELS * sizeof(struct iwl_scan_channel)));
+
+	cmd->channel_count = (u8)req->n_channels;
+	cmd->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
+	cmd->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
+	cmd->rxchain_sel_flags = iwl_mvm_scan_rx_chain(mvm);
+	cmd->max_out_time = iwl_mvm_scan_max_out_time(vif);
+	cmd->suspend_time = iwl_mvm_scan_suspend_time(vif);
+	cmd->rxon_flags = iwl_mvm_scan_rxon_flags(req);
+	cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
+					MAC_FILTER_IN_BEACON);
+	cmd->type = SCAN_TYPE_FORCED;
+	cmd->repeats = cpu_to_le32(1);
+
+	/*
+	 * If the user asked for passive scan, don't change to active scan if
+	 * you see any activity on the channel - remain passive.
+	 */
+	if (req->n_ssids > 0) {
+		cmd->passive2active = cpu_to_le16(1);
+		ssid = req->ssids[0].ssid;
+		ssid_len = req->ssids[0].ssid_len;
+	} else {
+		cmd->passive2active = 0;
+	}
+
+	iwl_mvm_scan_fill_ssids(cmd, req);
+
+	cmd->tx_cmd.tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL);
+	cmd->tx_cmd.sta_id = mvm->aux_sta.sta_id;
+	cmd->tx_cmd.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
+	cmd->tx_cmd.rate_n_flags =
+			iwl_mvm_scan_rate_n_flags(mvm, req->channels[0]->band,
+						  req->no_cck);
+
+	cmd->tx_cmd.len =
+		cpu_to_le16(iwl_mvm_fill_probe_req(
+			    (struct ieee80211_mgmt *)cmd->data,
+			    vif->addr,
+			    req->n_ssids, ssid, ssid_len,
+			    req->ie, req->ie_len,
+			    mvm->fw->ucode_capa.max_probe_length));
+
+	iwl_mvm_scan_fill_channels(cmd, req);
+
+	cmd->len = cpu_to_le16(sizeof(struct iwl_scan_cmd) +
+		le16_to_cpu(cmd->tx_cmd.len) +
+		(cmd->channel_count * sizeof(struct iwl_scan_channel)));
+	hcmd.len[0] = le16_to_cpu(cmd->len);
+
+	status = SCAN_RESPONSE_OK;
+	ret = iwl_mvm_send_cmd_status(mvm, &hcmd, &status);
+	if (!ret && status == SCAN_RESPONSE_OK) {
+		IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
+	} else {
+		/*
+		 * If the scan failed, it usually means that the FW was unable
+		 * to allocate the time events. Warn on it, but maybe we
+		 * should try to send the command again with different params.
+		 */
+		IWL_ERR(mvm, "Scan failed! status 0x%x ret %d\n",
+			status, ret);
+		mvm->scan_status = IWL_MVM_SCAN_NONE;
+		ret = -EIO;
+	}
+	return ret;
+}
+
+int iwl_mvm_rx_scan_response(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
+			  struct iwl_device_cmd *cmd)
+{
+	struct iwl_rx_packet *pkt = rxb_addr(rxb);
+	struct iwl_cmd_response *resp = (void *)pkt->data;
+
+	IWL_DEBUG_SCAN(mvm, "Scan response received. status 0x%x\n",
+		       le32_to_cpu(resp->status));
+	return 0;
+}
+
+int iwl_mvm_rx_scan_complete(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
+			  struct iwl_device_cmd *cmd)
+{
+	struct iwl_rx_packet *pkt = rxb_addr(rxb);
+	struct iwl_scan_complete_notif *notif = (void *)pkt->data;
+
+	IWL_DEBUG_SCAN(mvm, "Scan complete: status=0x%x scanned channels=%d\n",
+		       notif->status, notif->scanned_channels);
+
+	mvm->scan_status = IWL_MVM_SCAN_NONE;
+	ieee80211_scan_completed(mvm->hw, notif->status != SCAN_COMP_STATUS_OK);
+
+	return 0;
+}
+
+static bool iwl_mvm_scan_abort_notif(struct iwl_notif_wait_data *notif_wait,
+				     struct iwl_rx_packet *pkt, void *data)
+{
+	struct iwl_mvm *mvm =
+		container_of(notif_wait, struct iwl_mvm, notif_wait);
+	struct iwl_scan_complete_notif *notif;
+	u32 *resp;
+
+	switch (pkt->hdr.cmd) {
+	case SCAN_ABORT_CMD:
+		resp = (void *)pkt->data;
+		if (*resp == CAN_ABORT_STATUS) {
+			IWL_DEBUG_SCAN(mvm,
+				       "Scan can be aborted, wait until completion\n");
+			return false;
+		}
+
+		IWL_DEBUG_SCAN(mvm, "Scan cannot be aborted, exit now: %d\n",
+			       *resp);
+		return true;
+
+	case SCAN_COMPLETE_NOTIFICATION:
+		notif = (void *)pkt->data;
+		IWL_DEBUG_SCAN(mvm, "Scan aborted: status 0x%x\n",
+			       notif->status);
+		return true;
+
+	default:
+		WARN_ON(1);
+		return false;
+	};
+}
+
+void iwl_mvm_cancel_scan(struct iwl_mvm *mvm)
+{
+	struct iwl_notification_wait wait_scan_abort;
+	static const u8 scan_abort_notif[] = { SCAN_ABORT_CMD,
+					       SCAN_COMPLETE_NOTIFICATION };
+	int ret;
+
+	iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_abort,
+				   scan_abort_notif,
+				   ARRAY_SIZE(scan_abort_notif),
+				   iwl_mvm_scan_abort_notif, NULL);
+
+	ret = iwl_mvm_send_cmd_pdu(mvm, SCAN_ABORT_CMD, CMD_SYNC, 0, NULL);
+	if (ret) {
+		IWL_ERR(mvm, "Couldn't send SCAN_ABORT_CMD: %d\n", ret);
+		goto out_remove_notif;
+	}
+
+	ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_abort, 1 * HZ);
+	if (ret)
+		IWL_ERR(mvm, "%s - failed on timeout\n", __func__);
+
+	return;
+
+out_remove_notif:
+	iwl_remove_notification(&mvm->notif_wait, &wait_scan_abort);
+}