diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/mvm/scan.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/mvm/scan.c | 441 |
1 files changed, 441 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 0000000..8e1f6c0 --- /dev/null +++ b/drivers/net/wireless/iwlwifi/mvm/scan.c @@ -0,0 +1,441 @@ +/****************************************************************************** + * + * 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 COPYING. + * + * 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 = iwl_fw_valid_rx_ant(mvm->fw); + + 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, iwl_fw_valid_tx_ant(mvm->fw), + 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; + + for (req_idx = req->n_ssids - 1, fw_idx = 0; req_idx > 0; + req_idx--, fw_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; + + for (i = 0; i < cmd->channel_count; i++) { + chan->channel = cpu_to_le16(req->channels[i]->hw_value); + chan->type = cpu_to_le32(BIT(req->n_ssids) - 1); + if (req->channels[i]->flags & IEEE80211_CHAN_PASSIVE_SCAN) + chan->type &= cpu_to_le32(~SCAN_CHANNEL_TYPE_ACTIVE); + 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); + + if (vif->type == NL80211_IFTYPE_P2P_DEVICE) + cmd->type = cpu_to_le32(SCAN_TYPE_DISCOVERY_FORCED); + else + cmd->type = cpu_to_le32(SCAN_TYPE_FORCED); + + /* + * TODO: This is a WA due to a bug in the FW AUX framework that does not + * properly handle time events that fail to be scheduled + */ + cmd->type = cpu_to_le32(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); +} |