/****************************************************************************** * * 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; }