| /****************************************************************************** |
| * |
| * 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); |
| } |
| |
| /* |
| * 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; |
| } |
| |
| /* |
| * iwl_mvm_rx_statistics - STATISTICS_NOTIFICATION handler |
| * |
| * TODO: This handler is implemented partially. |
| * It only gets the NIC's temperature. |
| */ |
| 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; |
| |
| if (mvm->temperature != le32_to_cpu(common->temperature)) { |
| mvm->temperature = le32_to_cpu(common->temperature); |
| iwl_mvm_tt_handler(mvm); |
| } |
| |
| return 0; |
| } |