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linux/drivers/net/wireless/iwlwifi/mvm/rx.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 "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));
/*
* 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,
};
if (mvm->temperature != le32_to_cpu(common->temperature)) {
mvm->temperature = le32_to_cpu(common->temperature);
iwl_mvm_tt_handler(mvm);
}
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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