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linux/drivers/net/wireless/iwlwifi/mvm/rx.c
Johannes Berg 8b4139dc9f iwlwifi: add Intel Mobile Communications copyright 
Our legal structure changed at some point (see wikipedia), but
we forgot to immediately switch over to the new copyright
notice.

For files that we have modified in the time since the change,
add the proper copyright notice now.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
2014-09-03 22:49:07 +03:00

527 lines
17 KiB
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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.
* Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
*
* 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.
* Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
* 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 "iwl-trans.h"
#include "mvm.h"
#include "fw-api.h"
/*
* iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
*
* Copies the phy information in mvm->last_phy_info, it will be used when the
* actual data will come from the fw in the next packet.
*/
int iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
struct iwl_device_cmd *cmd)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
mvm->ampdu_ref++;
#ifdef CONFIG_IWLWIFI_DEBUGFS
if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
spin_lock(&mvm->drv_stats_lock);
mvm->drv_rx_stats.ampdu_count++;
spin_unlock(&mvm->drv_stats_lock);
}
#endif
return 0;
}
/*
* iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
*
* Adds the rxb to a new skb and give it to mac80211
*/
static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
struct ieee80211_hdr *hdr, u16 len,
u32 ampdu_status,
struct iwl_rx_cmd_buffer *rxb,
struct ieee80211_rx_status *stats)
{
struct sk_buff *skb;
unsigned int hdrlen, fraglen;
/* Dont use dev_alloc_skb(), we'll have enough headroom once
* ieee80211_hdr pulled.
*/
skb = alloc_skb(128, GFP_ATOMIC);
if (!skb) {
IWL_ERR(mvm, "alloc_skb failed\n");
return;
}
/* If frame is small enough to fit in skb->head, pull it completely.
* If not, only pull ieee80211_hdr so that splice() or TCP coalesce
* are more efficient.
*/
hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr);
memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
fraglen = len - hdrlen;
if (fraglen) {
int offset = (void *)hdr + hdrlen -
rxb_addr(rxb) + rxb_offset(rxb);
skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
fraglen, rxb->truesize);
}
memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
ieee80211_rx(mvm->hw, skb);
}
/*
* iwl_mvm_get_signal_strength - use new rx PHY INFO API
* values are reported by the fw as positive values - need to negate
* to obtain their dBM. Account for missing antennas by replacing 0
* values by -256dBm: practically 0 power and a non-feasible 8 bit value.
*/
static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
struct iwl_rx_phy_info *phy_info,
struct ieee80211_rx_status *rx_status)
{
int energy_a, energy_b, energy_c, max_energy;
u32 val;
val =
le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
IWL_RX_INFO_ENERGY_ANT_A_POS;
energy_a = energy_a ? -energy_a : -256;
energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
IWL_RX_INFO_ENERGY_ANT_B_POS;
energy_b = energy_b ? -energy_b : -256;
energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
IWL_RX_INFO_ENERGY_ANT_C_POS;
energy_c = energy_c ? -energy_c : -256;
max_energy = max(energy_a, energy_b);
max_energy = max(max_energy, energy_c);
IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
energy_a, energy_b, energy_c, max_energy);
rx_status->signal = max_energy;
rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
RX_RES_PHY_FLAGS_ANTENNA)
>> RX_RES_PHY_FLAGS_ANTENNA_POS;
rx_status->chain_signal[0] = energy_a;
rx_status->chain_signal[1] = energy_b;
rx_status->chain_signal[2] = energy_c;
}
/*
* iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
* @mvm: the mvm object
* @hdr: 80211 header
* @stats: status in mac80211's format
* @rx_pkt_status: status coming from fw
*
* returns non 0 value if the packet should be dropped
*/
static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
struct ieee80211_hdr *hdr,
struct ieee80211_rx_status *stats,
u32 rx_pkt_status)
{
if (!ieee80211_has_protected(hdr->frame_control) ||
(rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
RX_MPDU_RES_STATUS_SEC_NO_ENC)
return 0;
/* packet was encrypted with unknown alg */
if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
RX_MPDU_RES_STATUS_SEC_ENC_ERR)
return 0;
switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
/* alg is CCM: check MIC only */
if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
return -1;
stats->flag |= RX_FLAG_DECRYPTED;
IWL_DEBUG_WEP(mvm, "hw decrypted CCMP successfully\n");
return 0;
case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
/* Don't drop the frame and decrypt it in SW */
if (!(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
return 0;
/* fall through if TTAK OK */
case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
return -1;
stats->flag |= RX_FLAG_DECRYPTED;
return 0;
case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
return -1;
stats->flag |= RX_FLAG_DECRYPTED;
return 0;
default:
IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
}
return 0;
}
/*
* iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
*
* Handles the actual data of the Rx packet from the fw
*/
int iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
struct iwl_device_cmd *cmd)
{
struct ieee80211_hdr *hdr;
struct ieee80211_rx_status rx_status = {};
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_rx_phy_info *phy_info;
struct iwl_rx_mpdu_res_start *rx_res;
u32 len;
u32 ampdu_status;
u32 rate_n_flags;
u32 rx_pkt_status;
phy_info = &mvm->last_phy_info;
rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
len = le16_to_cpu(rx_res->byte_count);
rx_pkt_status = le32_to_cpup((__le32 *)
(pkt->data + sizeof(*rx_res) + len));
memset(&rx_status, 0, sizeof(rx_status));
/*
* We have tx blocked stations (with CS bit). If we heard frames from
* a blocked station on a new channel we can TX to it again.
*/
if (unlikely(mvm->csa_tx_block_bcn_timeout)) {
struct ieee80211_sta *sta;
rcu_read_lock();
sta = ieee80211_find_sta(
rcu_dereference(mvm->csa_tx_blocked_vif), hdr->addr2);
if (sta)
iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, false);
rcu_read_unlock();
}
/*
* drop the packet if it has failed being decrypted by HW
*/
if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, &rx_status, rx_pkt_status)) {
IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
rx_pkt_status);
return 0;
}
if ((unlikely(phy_info->cfg_phy_cnt > 20))) {
IWL_DEBUG_DROP(mvm, "dsp size out of range [0,20]: %d\n",
phy_info->cfg_phy_cnt);
return 0;
}
/*
* Keep packets with CRC errors (and with overrun) for monitor mode
* (otherwise the firmware discards them) but mark them as bad.
*/
if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
!(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
}
/* This will be used in several places later */
rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
/* rx_status carries information about the packet to mac80211 */
rx_status.mactime = le64_to_cpu(phy_info->timestamp);
rx_status.device_timestamp = le32_to_cpu(phy_info->system_timestamp);
rx_status.band =
(phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
rx_status.freq =
ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
rx_status.band);
/*
* TSF as indicated by the fw is at INA time, but mac80211 expects the
* TSF at the beginning of the MPDU.
*/
/*rx_status.flag |= RX_FLAG_MACTIME_MPDU;*/
iwl_mvm_get_signal_strength(mvm, phy_info, &rx_status);
IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status.signal,
(unsigned long long)rx_status.mactime);
/* set the preamble flag if appropriate */
if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
rx_status.flag |= RX_FLAG_SHORTPRE;
if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
/*
* We know which subframes of an A-MPDU belong
* together since we get a single PHY response
* from the firmware for all of them
*/
rx_status.flag |= RX_FLAG_AMPDU_DETAILS;
rx_status.ampdu_reference = mvm->ampdu_ref;
}
/* Set up the HT phy flags */
switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
case RATE_MCS_CHAN_WIDTH_20:
break;
case RATE_MCS_CHAN_WIDTH_40:
rx_status.flag |= RX_FLAG_40MHZ;
break;
case RATE_MCS_CHAN_WIDTH_80:
rx_status.vht_flag |= RX_VHT_FLAG_80MHZ;
break;
case RATE_MCS_CHAN_WIDTH_160:
rx_status.vht_flag |= RX_VHT_FLAG_160MHZ;
break;
}
if (rate_n_flags & RATE_MCS_SGI_MSK)
rx_status.flag |= RX_FLAG_SHORT_GI;
if (rate_n_flags & RATE_HT_MCS_GF_MSK)
rx_status.flag |= RX_FLAG_HT_GF;
if (rate_n_flags & RATE_MCS_LDPC_MSK)
rx_status.flag |= RX_FLAG_LDPC;
if (rate_n_flags & RATE_MCS_HT_MSK) {
u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
RATE_MCS_STBC_POS;
rx_status.flag |= RX_FLAG_HT;
rx_status.rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
rx_status.flag |= stbc << RX_FLAG_STBC_SHIFT;
} else if (rate_n_flags & RATE_MCS_VHT_MSK) {
u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
RATE_MCS_STBC_POS;
rx_status.vht_nss =
((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
RATE_VHT_MCS_NSS_POS) + 1;
rx_status.rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
rx_status.flag |= RX_FLAG_VHT;
rx_status.flag |= stbc << RX_FLAG_STBC_SHIFT;
if (rate_n_flags & RATE_MCS_BF_MSK)
rx_status.vht_flag |= RX_VHT_FLAG_BF;
} else {
rx_status.rate_idx =
iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
rx_status.band);
}
#ifdef CONFIG_IWLWIFI_DEBUGFS
iwl_mvm_update_frame_stats(mvm, &mvm->drv_rx_stats, rate_n_flags,
rx_status.flag & RX_FLAG_AMPDU_DETAILS);
#endif
iwl_mvm_pass_packet_to_mac80211(mvm, hdr, len, ampdu_status,
rxb, &rx_status);
return 0;
}
static void iwl_mvm_update_rx_statistics(struct iwl_mvm *mvm,
struct iwl_notif_statistics *stats)
{
/*
* NOTE FW aggregates the statistics - BUT the statistics are cleared
* when the driver issues REPLY_STATISTICS_CMD 0x9c with CLEAR_STATS
* bit set.
*/
lockdep_assert_held(&mvm->mutex);
memcpy(&mvm->rx_stats, &stats->rx, sizeof(struct mvm_statistics_rx));
}
struct iwl_mvm_stat_data {
struct iwl_notif_statistics *stats;
struct iwl_mvm *mvm;
};
static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
struct ieee80211_vif *vif)
{
struct iwl_mvm_stat_data *data = _data;
struct iwl_notif_statistics *stats = data->stats;
struct iwl_mvm *mvm = data->mvm;
int sig = -stats->general.beacon_filter_average_energy;
int last_event;
int thold = vif->bss_conf.cqm_rssi_thold;
int hyst = vif->bss_conf.cqm_rssi_hyst;
u16 id = le32_to_cpu(stats->rx.general.mac_id);
struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
if (mvmvif->id != id)
return;
if (vif->type != NL80211_IFTYPE_STATION)
return;
mvmvif->bf_data.ave_beacon_signal = sig;
/* BT Coex */
if (mvmvif->bf_data.bt_coex_min_thold !=
mvmvif->bf_data.bt_coex_max_thold) {
last_event = mvmvif->bf_data.last_bt_coex_event;
if (sig > mvmvif->bf_data.bt_coex_max_thold &&
(last_event <= mvmvif->bf_data.bt_coex_min_thold ||
last_event == 0)) {
mvmvif->bf_data.last_bt_coex_event = sig;
IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
sig);
iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
} else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
(last_event >= mvmvif->bf_data.bt_coex_max_thold ||
last_event == 0)) {
mvmvif->bf_data.last_bt_coex_event = sig;
IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
sig);
iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
}
}
if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
return;
/* CQM Notification */
last_event = mvmvif->bf_data.last_cqm_event;
if (thold && sig < thold && (last_event == 0 ||
sig < last_event - hyst)) {
mvmvif->bf_data.last_cqm_event = sig;
IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
sig);
ieee80211_cqm_rssi_notify(
vif,
NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
GFP_KERNEL);
} else if (sig > thold &&
(last_event == 0 || sig > last_event + hyst)) {
mvmvif->bf_data.last_cqm_event = sig;
IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
sig);
ieee80211_cqm_rssi_notify(
vif,
NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
GFP_KERNEL);
}
}
/*
* iwl_mvm_rx_statistics - STATISTICS_NOTIFICATION handler
*
* TODO: This handler is implemented partially.
*/
int iwl_mvm_rx_statistics(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_notif_statistics *stats = (void *)&pkt->data;
struct mvm_statistics_general_common *common = &stats->general.common;
struct iwl_mvm_stat_data data = {
.stats = stats,
.mvm = mvm,
};
/*
* set temperature debug enabled - ignore FW temperature updates
* and use the user set temperature.
*/
if (mvm->temperature_test) {
if (mvm->temperature < le32_to_cpu(common->temperature))
IWL_DEBUG_TEMP(mvm,
"Ignoring FW temperature update that is greater than the debug set temperature (debug temp = %d, fw temp = %d)\n",
mvm->temperature,
le32_to_cpu(common->temperature));
/*
* skip iwl_mvm_tt_handler since we are in
* temperature debug mode and we are ignoring
* the new temperature value
*/
goto update;
}
if (mvm->temperature != le32_to_cpu(common->temperature)) {
mvm->temperature = le32_to_cpu(common->temperature);
iwl_mvm_tt_handler(mvm);
}
update:
iwl_mvm_update_rx_statistics(mvm, stats);
ieee80211_iterate_active_interfaces(mvm->hw,
IEEE80211_IFACE_ITER_NORMAL,
iwl_mvm_stat_iterator,
&data);
return 0;
}
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