/****************************************************************************** * * 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 * 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); } /* * iwl_mvm_calc_rssi - calculate the rssi in dBm * @phy_info: the phy information for the coming packet */ static int iwl_mvm_calc_rssi(struct iwl_mvm *mvm, struct iwl_rx_phy_info *phy_info) { 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; /* Find max rssi among 2 possible receivers. * These values are measured by the Digital Signal Processor (DSP). * They should stay fairly constant even as the signal strength varies, * if the radio's Automatic Gain Control (AGC) is working right. * AGC value (see below) will provide the "interesting" info. */ 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); return max_rssi_dbm; } /* * 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; } 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); return 0; } /* 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;*/ /* Find max signal strength (dBm) among 3 antenna/receiver chains */ rx_status.signal = iwl_mvm_calc_rssi(mvm, phy_info); IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status.signal, (unsigned long long)rx_status.mactime); /* * "antenna number" * * It seems that the antenna field in the phy flags value * is actually a bit field. This is undefined by radiotap, * it wants an actual antenna number but I always get "7" * for most legacy frames I receive indicating that the * same frame was received on all three RX chains. * * I think this field should be removed in favor of a * new 802.11n radiotap field "RX chains" that is defined * as a bitmask. */ rx_status.antenna = (le16_to_cpu(phy_info->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA) >> RX_RES_PHY_FLAGS_ANTENNA_POS; /* 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; }