| /****************************************************************************** |
| * |
| * 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 "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++; |
| 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_ni(mvm->hw, skb); |
| } |
| |
| static void iwl_mvm_calc_rssi(struct iwl_mvm *mvm, |
| struct iwl_rx_phy_info *phy_info, |
| struct ieee80211_rx_status *rx_status) |
| { |
| int rssi_a, rssi_b, rssi_a_dbm, rssi_b_dbm, max_rssi_dbm; |
| int rssi_all_band_a, rssi_all_band_b; |
| u32 agc_a, agc_b, max_agc; |
| u32 val; |
| |
| val = le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_AGC_IDX]); |
| agc_a = (val & IWL_OFDM_AGC_A_MSK) >> IWL_OFDM_AGC_A_POS; |
| agc_b = (val & IWL_OFDM_AGC_B_MSK) >> IWL_OFDM_AGC_B_POS; |
| max_agc = max_t(u32, agc_a, agc_b); |
| |
| val = le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_RSSI_AB_IDX]); |
| rssi_a = (val & IWL_OFDM_RSSI_INBAND_A_MSK) >> IWL_OFDM_RSSI_A_POS; |
| rssi_b = (val & IWL_OFDM_RSSI_INBAND_B_MSK) >> IWL_OFDM_RSSI_B_POS; |
| rssi_all_band_a = (val & IWL_OFDM_RSSI_ALLBAND_A_MSK) >> |
| IWL_OFDM_RSSI_ALLBAND_A_POS; |
| rssi_all_band_b = (val & IWL_OFDM_RSSI_ALLBAND_B_MSK) >> |
| IWL_OFDM_RSSI_ALLBAND_B_POS; |
| |
| /* |
| * dBm = rssi dB - agc dB - constant. |
| * Higher AGC (higher radio gain) means lower signal. |
| */ |
| rssi_a_dbm = rssi_a - IWL_RSSI_OFFSET - agc_a; |
| rssi_b_dbm = rssi_b - IWL_RSSI_OFFSET - agc_b; |
| max_rssi_dbm = max_t(int, rssi_a_dbm, rssi_b_dbm); |
| |
| IWL_DEBUG_STATS(mvm, "Rssi In A %d B %d Max %d AGCA %d AGCB %d\n", |
| rssi_a_dbm, rssi_b_dbm, max_rssi_dbm, agc_a, agc_b); |
| |
| rx_status->signal = max_rssi_dbm; |
| 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] = rssi_a_dbm; |
| rx_status->chain_signal[1] = rssi_b_dbm; |
| } |
| |
| /* |
| * 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; |
| |
| 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;*/ |
| |
| if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_RX_ENERGY_API) |
| iwl_mvm_get_signal_strength(mvm, phy_info, &rx_status); |
| else |
| iwl_mvm_calc_rssi(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.flag |= RX_FLAG_80MHZ; |
| break; |
| case RATE_MCS_CHAN_WIDTH_160: |
| rx_status.flag |= RX_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_HT_MSK) { |
| rx_status.flag |= RX_FLAG_HT; |
| rx_status.rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK; |
| } else if (rate_n_flags & RATE_MCS_VHT_MSK) { |
| 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; |
| } else { |
| rx_status.rate_idx = |
| iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags, |
| rx_status.band); |
| } |
| |
| 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; |
| } |