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linux/drivers/net/wireless/iwlwifi/mvm/scan.c

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/******************************************************************************
*
* 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 - 2014 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 - 2014 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
#define LONG_OUT_TIME_PERIOD 600
#define SHORT_OUT_TIME_PERIOD 200
#define SUSPEND_TIME_PERIOD 100
static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
{
u16 rx_chain;
u8 rx_ant;
if (mvm->scan_rx_ant != ANT_NONE)
rx_ant = mvm->scan_rx_ant;
else
rx_ant = mvm->fw->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,
u32 flags, bool is_assoc)
{
if (!is_assoc)
return 0;
if (flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
return cpu_to_le32(ieee80211_tu_to_usec(SHORT_OUT_TIME_PERIOD));
return cpu_to_le32(ieee80211_tu_to_usec(LONG_OUT_TIME_PERIOD));
}
static inline __le32 iwl_mvm_scan_suspend_time(struct ieee80211_vif *vif,
bool is_assoc)
{
if (!is_assoc)
return 0;
return cpu_to_le32(ieee80211_tu_to_usec(SUSPEND_TIME_PERIOD));
}
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->fw->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 first)
{
int fw_idx, req_idx;
for (req_idx = req->n_ssids - 1, fw_idx = 0; req_idx >= first;
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). If the first SSID is
* already included in the probe template, so we need to set only
* req->n_ssids - 1 bits in addition to the first bit.
*/
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,
bool basic_ssid)
{
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;
int type = BIT(req->n_ssids) - 1;
if (!basic_ssid)
type |= BIT(req->n_ssids);
for (i = 0; i < cmd->channel_count; i++) {
chan->channel = cpu_to_le16(req->channels[i]->hw_value);
chan->type = cpu_to_le32(type);
if (req->channels[i]->flags & IEEE80211_CHAN_NO_IR)
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;
}
static void iwl_mvm_vif_assoc_iterator(void *data, u8 *mac,
struct ieee80211_vif *vif)
{
bool *is_assoc = data;
if (vif->bss_conf.assoc)
*is_assoc = true;
}
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;
bool is_assoc = false;
int ret;
u32 status;
int ssid_len = 0;
u8 *ssid = NULL;
bool basic_ssid = !(mvm->fw->ucode_capa.flags &
IWL_UCODE_TLV_FLAGS_NO_BASIC_SSID);
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)));
ieee80211_iterate_active_interfaces_atomic(mvm->hw,
IEEE80211_IFACE_ITER_NORMAL,
iwl_mvm_vif_assoc_iterator,
&is_assoc);
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, req->flags,
is_assoc);
cmd->suspend_time = iwl_mvm_scan_suspend_time(vif, is_assoc);
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);
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);
cmd->scan_flags |= SCAN_FLAGS_PASSIVE2ACTIVE;
if (basic_ssid) {
ssid = req->ssids[0].ssid;
ssid_len = req->ssids[0].ssid_len;
}
} else {
cmd->passive2active = 0;
cmd->scan_flags &= ~SCAN_FLAGS_PASSIVE2ACTIVE;
}
iwl_mvm_scan_fill_ssids(cmd, req, basic_ssid ? 1 : 0);
cmd->tx_cmd.tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
TX_CMD_FLG_BT_DIS);
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, basic_ssid);
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);
iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
return 0;
}
int iwl_mvm_rx_sched_scan_results(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_sched_scan_results *notif = (void *)pkt->data;
if (notif->client_bitmap & SCAN_CLIENT_SCHED_SCAN) {
IWL_DEBUG_SCAN(mvm, "Scheduled scan results\n");
ieee80211_sched_scan_results(mvm->hw);
}
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;
}
/*
* If scan cannot be aborted, it means that we had a
* SCAN_COMPLETE_NOTIFICATION in the pipe and it called
* ieee80211_scan_completed already.
*/
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;
if (mvm->scan_status == IWL_MVM_SCAN_NONE)
return;
if (iwl_mvm_is_radio_killed(mvm)) {
ieee80211_scan_completed(mvm->hw, true);
iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
mvm->scan_status = IWL_MVM_SCAN_NONE;
return;
}
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);
/* mac80211's state will be cleaned in the nic_restart flow */
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);
}
int iwl_mvm_rx_scan_offload_complete_notif(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_offload_complete *scan_notif = (void *)pkt->data;
/* scan status must be locked for proper checking */
lockdep_assert_held(&mvm->mutex);
IWL_DEBUG_SCAN(mvm, "Scheduled scan completed, status %s\n",
scan_notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
"completed" : "aborted");
/* might already be something else again, don't reset if so */
if (mvm->scan_status == IWL_MVM_SCAN_SCHED)
mvm->scan_status = IWL_MVM_SCAN_NONE;
ieee80211_sched_scan_stopped(mvm->hw);
return 0;
}
static void iwl_scan_offload_build_tx_cmd(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
struct ieee80211_sched_scan_ies *ies,
enum ieee80211_band band,
struct iwl_tx_cmd *cmd,
u8 *data)
{
u16 cmd_len;
cmd->tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL);
cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
cmd->sta_id = mvm->aux_sta.sta_id;
cmd->rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm, band, false);
cmd_len = iwl_mvm_fill_probe_req((struct ieee80211_mgmt *)data,
vif->addr,
1, NULL, 0,
ies->ie[band], ies->len[band],
SCAN_OFFLOAD_PROBE_REQ_SIZE);
cmd->len = cpu_to_le16(cmd_len);
}
static void iwl_build_scan_cmd(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
struct cfg80211_sched_scan_request *req,
struct iwl_scan_offload_cmd *scan)
{
bool is_assoc = false;
ieee80211_iterate_active_interfaces_atomic(mvm->hw,
IEEE80211_IFACE_ITER_NORMAL,
iwl_mvm_vif_assoc_iterator,
&is_assoc);
scan->channel_count =
mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels +
mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
scan->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
scan->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
scan->good_CRC_th = IWL_GOOD_CRC_TH_DEFAULT;
scan->rx_chain = iwl_mvm_scan_rx_chain(mvm);
scan->max_out_time = iwl_mvm_scan_max_out_time(vif, req->flags,
is_assoc);
scan->suspend_time = iwl_mvm_scan_suspend_time(vif, is_assoc);
scan->filter_flags |= cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
MAC_FILTER_IN_BEACON);
scan->scan_type = cpu_to_le32(SCAN_TYPE_BACKGROUND);
scan->rep_count = cpu_to_le32(1);
}
static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
{
int i;
for (i = 0; i < PROBE_OPTION_MAX; i++) {
if (!ssid_list[i].len)
break;
if (ssid_list[i].len == ssid_len &&
!memcmp(ssid_list->ssid, ssid, ssid_len))
return i;
}
return -1;
}
static void iwl_scan_offload_build_ssid(struct cfg80211_sched_scan_request *req,
struct iwl_scan_offload_cmd *scan,
u32 *ssid_bitmap)
{
int i, j;
int index;
/*
* copy SSIDs from match list.
* iwl_config_sched_scan_profiles() uses the order of these ssids to
* config match list.
*/
for (i = 0; i < req->n_match_sets && i < PROBE_OPTION_MAX; i++) {
/* skip empty SSID matchsets */
if (!req->match_sets[i].ssid.ssid_len)
continue;
scan->direct_scan[i].id = WLAN_EID_SSID;
scan->direct_scan[i].len = req->match_sets[i].ssid.ssid_len;
memcpy(scan->direct_scan[i].ssid, req->match_sets[i].ssid.ssid,
scan->direct_scan[i].len);
}
/* add SSIDs from scan SSID list */
*ssid_bitmap = 0;
for (j = 0; j < req->n_ssids && i < PROBE_OPTION_MAX; j++) {
index = iwl_ssid_exist(req->ssids[j].ssid,
req->ssids[j].ssid_len,
scan->direct_scan);
if (index < 0) {
if (!req->ssids[j].ssid_len)
continue;
scan->direct_scan[i].id = WLAN_EID_SSID;
scan->direct_scan[i].len = req->ssids[j].ssid_len;
memcpy(scan->direct_scan[i].ssid, req->ssids[j].ssid,
scan->direct_scan[i].len);
*ssid_bitmap |= BIT(i + 1);
i++;
} else {
*ssid_bitmap |= BIT(index + 1);
}
}
}
static void iwl_build_channel_cfg(struct iwl_mvm *mvm,
struct cfg80211_sched_scan_request *req,
struct iwl_scan_channel_cfg *channels,
enum ieee80211_band band,
int *head, int *tail,
u32 ssid_bitmap)
{
struct ieee80211_supported_band *s_band;
int n_probes = req->n_ssids;
int n_channels = req->n_channels;
u8 active_dwell, passive_dwell;
int i, j, index = 0;
bool partial;
/*
* We have to configure all supported channels, even if we don't want to
* scan on them, but we have to send channels in the order that we want
* to scan. So add requested channels to head of the list and others to
* the end.
*/
active_dwell = iwl_mvm_get_active_dwell(band, n_probes);
passive_dwell = iwl_mvm_get_passive_dwell(band);
s_band = &mvm->nvm_data->bands[band];
for (i = 0; i < s_band->n_channels && *head <= *tail; i++) {
partial = false;
for (j = 0; j < n_channels; j++)
if (s_band->channels[i].center_freq ==
req->channels[j]->center_freq) {
index = *head;
(*head)++;
/*
* Channels that came with the request will be
* in partial scan .
*/
partial = true;
break;
}
if (!partial) {
index = *tail;
(*tail)--;
}
channels->channel_number[index] =
cpu_to_le16(ieee80211_frequency_to_channel(
s_band->channels[i].center_freq));
channels->dwell_time[index][0] = active_dwell;
channels->dwell_time[index][1] = passive_dwell;
channels->iter_count[index] = cpu_to_le16(1);
channels->iter_interval[index] = 0;
if (!(s_band->channels[i].flags & IEEE80211_CHAN_NO_IR))
channels->type[index] |=
cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_ACTIVE);
channels->type[index] |=
cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_FULL);
if (partial)
channels->type[index] |=
cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_PARTIAL);
if (s_band->channels[i].flags & IEEE80211_CHAN_NO_HT40)
channels->type[index] |=
cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_NARROW);
/* scan for all SSIDs from req->ssids */
channels->type[index] |= cpu_to_le32(ssid_bitmap);
}
}
int iwl_mvm_config_sched_scan(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
struct cfg80211_sched_scan_request *req,
struct ieee80211_sched_scan_ies *ies)
{
int supported_bands = 0;
int band_2ghz = mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels;
int band_5ghz = mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
int head = 0;
int tail = band_2ghz + band_5ghz;
u32 ssid_bitmap;
int cmd_len;
int ret;
struct iwl_scan_offload_cfg *scan_cfg;
struct iwl_host_cmd cmd = {
.id = SCAN_OFFLOAD_CONFIG_CMD,
.flags = CMD_SYNC,
};
lockdep_assert_held(&mvm->mutex);
if (band_2ghz)
supported_bands++;
if (band_5ghz)
supported_bands++;
cmd_len = sizeof(struct iwl_scan_offload_cfg) +
supported_bands * SCAN_OFFLOAD_PROBE_REQ_SIZE;
scan_cfg = kzalloc(cmd_len, GFP_KERNEL);
if (!scan_cfg)
return -ENOMEM;
iwl_build_scan_cmd(mvm, vif, req, &scan_cfg->scan_cmd);
scan_cfg->scan_cmd.len = cpu_to_le16(cmd_len);
iwl_scan_offload_build_ssid(req, &scan_cfg->scan_cmd, &ssid_bitmap);
/* build tx frames for supported bands */
if (band_2ghz) {
iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
IEEE80211_BAND_2GHZ,
&scan_cfg->scan_cmd.tx_cmd[0],
scan_cfg->data);
iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
IEEE80211_BAND_2GHZ, &head, &tail,
ssid_bitmap);
}
if (band_5ghz) {
iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
IEEE80211_BAND_5GHZ,
&scan_cfg->scan_cmd.tx_cmd[1],
scan_cfg->data +
SCAN_OFFLOAD_PROBE_REQ_SIZE);
iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
IEEE80211_BAND_5GHZ, &head, &tail,
ssid_bitmap);
}
cmd.data[0] = scan_cfg;
cmd.len[0] = cmd_len;
cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
IWL_DEBUG_SCAN(mvm, "Sending scheduled scan config\n");
ret = iwl_mvm_send_cmd(mvm, &cmd);
kfree(scan_cfg);
return ret;
}
int iwl_mvm_config_sched_scan_profiles(struct iwl_mvm *mvm,
struct cfg80211_sched_scan_request *req)
{
struct iwl_scan_offload_profile *profile;
struct iwl_scan_offload_profile_cfg *profile_cfg;
struct iwl_scan_offload_blacklist *blacklist;
struct iwl_host_cmd cmd = {
.id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
.flags = CMD_SYNC,
.len[1] = sizeof(*profile_cfg),
.dataflags[0] = IWL_HCMD_DFL_NOCOPY,
.dataflags[1] = IWL_HCMD_DFL_NOCOPY,
};
int blacklist_len;
int i;
int ret;
if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES))
return -EIO;
if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
blacklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
else
blacklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;
blacklist = kzalloc(sizeof(*blacklist) * blacklist_len, GFP_KERNEL);
if (!blacklist)
return -ENOMEM;
profile_cfg = kzalloc(sizeof(*profile_cfg), GFP_KERNEL);
if (!profile_cfg) {
ret = -ENOMEM;
goto free_blacklist;
}
cmd.data[0] = blacklist;
cmd.len[0] = sizeof(*blacklist) * blacklist_len;
cmd.data[1] = profile_cfg;
/* No blacklist configuration */
profile_cfg->num_profiles = req->n_match_sets;
profile_cfg->active_clients = SCAN_CLIENT_SCHED_SCAN;
profile_cfg->pass_match = SCAN_CLIENT_SCHED_SCAN;
profile_cfg->match_notify = SCAN_CLIENT_SCHED_SCAN;
if (!req->n_match_sets || !req->match_sets[0].ssid.ssid_len)
profile_cfg->any_beacon_notify = SCAN_CLIENT_SCHED_SCAN;
for (i = 0; i < req->n_match_sets; i++) {
profile = &profile_cfg->profiles[i];
profile->ssid_index = i;
/* Support any cipher and auth algorithm */
profile->unicast_cipher = 0xff;
profile->auth_alg = 0xff;
profile->network_type = IWL_NETWORK_TYPE_ANY;
profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
}
IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config\n");
ret = iwl_mvm_send_cmd(mvm, &cmd);
kfree(profile_cfg);
free_blacklist:
kfree(blacklist);
return ret;
}
int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
struct cfg80211_sched_scan_request *req)
{
struct iwl_scan_offload_req scan_req = {
.watchdog = IWL_SCHED_SCAN_WATCHDOG,
.schedule_line[0].iterations = IWL_FAST_SCHED_SCAN_ITERATIONS,
.schedule_line[0].delay = req->interval / 1000,
.schedule_line[0].full_scan_mul = 1,
.schedule_line[1].iterations = 0xff,
.schedule_line[1].delay = req->interval / 1000,
.schedule_line[1].full_scan_mul = IWL_FULL_SCAN_MULTIPLIER,
};
if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
IWL_DEBUG_SCAN(mvm,
"Sending scheduled scan with filtering, filter len %d\n",
req->n_match_sets);
} else {
IWL_DEBUG_SCAN(mvm,
"Sending Scheduled scan without filtering\n");
scan_req.flags |= cpu_to_le16(IWL_SCAN_OFFLOAD_FLAG_PASS_ALL);
}
return iwl_mvm_send_cmd_pdu(mvm, SCAN_OFFLOAD_REQUEST_CMD, CMD_SYNC,
sizeof(scan_req), &scan_req);
}
static int iwl_mvm_send_sched_scan_abort(struct iwl_mvm *mvm)
{
int ret;
struct iwl_host_cmd cmd = {
.id = SCAN_OFFLOAD_ABORT_CMD,
.flags = CMD_SYNC,
};
u32 status;
/* Exit instantly with error when device is not ready
* to receive scan abort command or it does not perform
* scheduled scan currently */
if (mvm->scan_status != IWL_MVM_SCAN_SCHED)
return -EIO;
ret = iwl_mvm_send_cmd_status(mvm, &cmd, &status);
if (ret)
return ret;
if (status != CAN_ABORT_STATUS) {
/*
* The scan abort will return 1 for success or
* 2 for "failure". A failure condition can be
* due to simply not being in an active scan which
* can occur if we send the scan abort before the
* microcode has notified us that a scan is completed.
*/
IWL_DEBUG_SCAN(mvm, "SCAN OFFLOAD ABORT ret %d.\n", status);
ret = -EIO;
}
return ret;
}
void iwl_mvm_sched_scan_stop(struct iwl_mvm *mvm)
{
int ret;
lockdep_assert_held(&mvm->mutex);
if (mvm->scan_status != IWL_MVM_SCAN_SCHED) {
IWL_DEBUG_SCAN(mvm, "No offloaded scan to stop\n");
return;
}
ret = iwl_mvm_send_sched_scan_abort(mvm);
if (ret)
IWL_DEBUG_SCAN(mvm, "Send stop offload scan failed %d\n", ret);
else
IWL_DEBUG_SCAN(mvm, "Successfully sent stop offload scan\n");
}
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