forked from Minki/linux
511 lines
16 KiB
C
511 lines
16 KiB
C
/******************************************************************************
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
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* USA
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*
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* The full GNU General Public License is included in this distribution
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* in the file called COPYING.
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*
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* Contact Information:
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* Intel Linux Wireless <ilw@linux.intel.com>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*
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* BSD LICENSE
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*
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* Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*****************************************************************************/
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#include "iwl-trans.h"
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#include "mvm.h"
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#include "fw-api.h"
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/*
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* iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
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*
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* Copies the phy information in mvm->last_phy_info, it will be used when the
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* actual data will come from the fw in the next packet.
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*/
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int iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
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struct iwl_device_cmd *cmd)
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{
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struct iwl_rx_packet *pkt = rxb_addr(rxb);
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memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
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mvm->ampdu_ref++;
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return 0;
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}
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/*
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* iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
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*
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* Adds the rxb to a new skb and give it to mac80211
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*/
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static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
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struct ieee80211_hdr *hdr, u16 len,
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u32 ampdu_status,
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struct iwl_rx_cmd_buffer *rxb,
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struct ieee80211_rx_status *stats)
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{
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struct sk_buff *skb;
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unsigned int hdrlen, fraglen;
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/* Dont use dev_alloc_skb(), we'll have enough headroom once
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* ieee80211_hdr pulled.
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*/
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skb = alloc_skb(128, GFP_ATOMIC);
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if (!skb) {
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IWL_ERR(mvm, "alloc_skb failed\n");
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return;
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}
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/* If frame is small enough to fit in skb->head, pull it completely.
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* If not, only pull ieee80211_hdr so that splice() or TCP coalesce
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* are more efficient.
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*/
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hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr);
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memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
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fraglen = len - hdrlen;
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if (fraglen) {
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int offset = (void *)hdr + hdrlen -
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rxb_addr(rxb) + rxb_offset(rxb);
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skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
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fraglen, rxb->truesize);
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}
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memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
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ieee80211_rx_ni(mvm->hw, skb);
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}
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static void iwl_mvm_calc_rssi(struct iwl_mvm *mvm,
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struct iwl_rx_phy_info *phy_info,
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struct ieee80211_rx_status *rx_status)
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{
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int rssi_a, rssi_b, rssi_a_dbm, rssi_b_dbm, max_rssi_dbm;
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int rssi_all_band_a, rssi_all_band_b;
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u32 agc_a, agc_b, max_agc;
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u32 val;
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val = le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_AGC_IDX]);
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agc_a = (val & IWL_OFDM_AGC_A_MSK) >> IWL_OFDM_AGC_A_POS;
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agc_b = (val & IWL_OFDM_AGC_B_MSK) >> IWL_OFDM_AGC_B_POS;
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max_agc = max_t(u32, agc_a, agc_b);
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val = le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_RSSI_AB_IDX]);
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rssi_a = (val & IWL_OFDM_RSSI_INBAND_A_MSK) >> IWL_OFDM_RSSI_A_POS;
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rssi_b = (val & IWL_OFDM_RSSI_INBAND_B_MSK) >> IWL_OFDM_RSSI_B_POS;
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rssi_all_band_a = (val & IWL_OFDM_RSSI_ALLBAND_A_MSK) >>
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IWL_OFDM_RSSI_ALLBAND_A_POS;
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rssi_all_band_b = (val & IWL_OFDM_RSSI_ALLBAND_B_MSK) >>
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IWL_OFDM_RSSI_ALLBAND_B_POS;
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/*
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* dBm = rssi dB - agc dB - constant.
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* Higher AGC (higher radio gain) means lower signal.
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*/
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rssi_a_dbm = rssi_a - IWL_RSSI_OFFSET - agc_a;
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rssi_b_dbm = rssi_b - IWL_RSSI_OFFSET - agc_b;
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max_rssi_dbm = max_t(int, rssi_a_dbm, rssi_b_dbm);
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IWL_DEBUG_STATS(mvm, "Rssi In A %d B %d Max %d AGCA %d AGCB %d\n",
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rssi_a_dbm, rssi_b_dbm, max_rssi_dbm, agc_a, agc_b);
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rx_status->signal = max_rssi_dbm;
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rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
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RX_RES_PHY_FLAGS_ANTENNA)
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>> RX_RES_PHY_FLAGS_ANTENNA_POS;
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rx_status->chain_signal[0] = rssi_a_dbm;
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rx_status->chain_signal[1] = rssi_b_dbm;
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}
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/*
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* iwl_mvm_get_signal_strength - use new rx PHY INFO API
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* values are reported by the fw as positive values - need to negate
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* to obtain their dBM. Account for missing antennas by replacing 0
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* values by -256dBm: practically 0 power and a non-feasible 8 bit value.
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*/
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static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
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struct iwl_rx_phy_info *phy_info,
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struct ieee80211_rx_status *rx_status)
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{
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int energy_a, energy_b, energy_c, max_energy;
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u32 val;
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val =
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le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
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energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
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IWL_RX_INFO_ENERGY_ANT_A_POS;
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energy_a = energy_a ? -energy_a : -256;
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energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
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IWL_RX_INFO_ENERGY_ANT_B_POS;
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energy_b = energy_b ? -energy_b : -256;
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energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
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IWL_RX_INFO_ENERGY_ANT_C_POS;
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energy_c = energy_c ? -energy_c : -256;
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max_energy = max(energy_a, energy_b);
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max_energy = max(max_energy, energy_c);
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IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
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energy_a, energy_b, energy_c, max_energy);
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rx_status->signal = max_energy;
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rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
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RX_RES_PHY_FLAGS_ANTENNA)
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>> RX_RES_PHY_FLAGS_ANTENNA_POS;
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rx_status->chain_signal[0] = energy_a;
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rx_status->chain_signal[1] = energy_b;
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rx_status->chain_signal[2] = energy_c;
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}
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/*
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* iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
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* @mvm: the mvm object
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* @hdr: 80211 header
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* @stats: status in mac80211's format
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* @rx_pkt_status: status coming from fw
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*
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* returns non 0 value if the packet should be dropped
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*/
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static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
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struct ieee80211_hdr *hdr,
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struct ieee80211_rx_status *stats,
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u32 rx_pkt_status)
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{
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if (!ieee80211_has_protected(hdr->frame_control) ||
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(rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
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RX_MPDU_RES_STATUS_SEC_NO_ENC)
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return 0;
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/* packet was encrypted with unknown alg */
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if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
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RX_MPDU_RES_STATUS_SEC_ENC_ERR)
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return 0;
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switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
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case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
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/* alg is CCM: check MIC only */
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if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
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return -1;
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stats->flag |= RX_FLAG_DECRYPTED;
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IWL_DEBUG_WEP(mvm, "hw decrypted CCMP successfully\n");
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return 0;
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case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
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/* Don't drop the frame and decrypt it in SW */
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if (!(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
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return 0;
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/* fall through if TTAK OK */
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case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
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if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
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return -1;
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stats->flag |= RX_FLAG_DECRYPTED;
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return 0;
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case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
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if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
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return -1;
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stats->flag |= RX_FLAG_DECRYPTED;
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return 0;
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default:
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IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
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}
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return 0;
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}
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/*
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* iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
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*
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* Handles the actual data of the Rx packet from the fw
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*/
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int iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
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struct iwl_device_cmd *cmd)
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{
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struct ieee80211_hdr *hdr;
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struct ieee80211_rx_status rx_status = {};
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struct iwl_rx_packet *pkt = rxb_addr(rxb);
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struct iwl_rx_phy_info *phy_info;
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struct iwl_rx_mpdu_res_start *rx_res;
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u32 len;
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u32 ampdu_status;
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u32 rate_n_flags;
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u32 rx_pkt_status;
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phy_info = &mvm->last_phy_info;
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rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
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hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
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len = le16_to_cpu(rx_res->byte_count);
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rx_pkt_status = le32_to_cpup((__le32 *)
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(pkt->data + sizeof(*rx_res) + len));
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memset(&rx_status, 0, sizeof(rx_status));
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/*
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* drop the packet if it has failed being decrypted by HW
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*/
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if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, &rx_status, rx_pkt_status)) {
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IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
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rx_pkt_status);
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return 0;
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}
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if ((unlikely(phy_info->cfg_phy_cnt > 20))) {
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IWL_DEBUG_DROP(mvm, "dsp size out of range [0,20]: %d\n",
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phy_info->cfg_phy_cnt);
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return 0;
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}
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/*
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* Keep packets with CRC errors (and with overrun) for monitor mode
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* (otherwise the firmware discards them) but mark them as bad.
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*/
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if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
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!(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
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IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
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rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
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}
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/* This will be used in several places later */
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rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
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/* rx_status carries information about the packet to mac80211 */
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rx_status.mactime = le64_to_cpu(phy_info->timestamp);
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rx_status.device_timestamp = le32_to_cpu(phy_info->system_timestamp);
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rx_status.band =
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(phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
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IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
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rx_status.freq =
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ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
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rx_status.band);
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/*
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* TSF as indicated by the fw is at INA time, but mac80211 expects the
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* TSF at the beginning of the MPDU.
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*/
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/*rx_status.flag |= RX_FLAG_MACTIME_MPDU;*/
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if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_RX_ENERGY_API)
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iwl_mvm_get_signal_strength(mvm, phy_info, &rx_status);
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else
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iwl_mvm_calc_rssi(mvm, phy_info, &rx_status);
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IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status.signal,
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(unsigned long long)rx_status.mactime);
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/* set the preamble flag if appropriate */
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if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
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rx_status.flag |= RX_FLAG_SHORTPRE;
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if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
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/*
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* We know which subframes of an A-MPDU belong
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* together since we get a single PHY response
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* from the firmware for all of them
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*/
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rx_status.flag |= RX_FLAG_AMPDU_DETAILS;
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rx_status.ampdu_reference = mvm->ampdu_ref;
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}
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/* Set up the HT phy flags */
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switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
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case RATE_MCS_CHAN_WIDTH_20:
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break;
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case RATE_MCS_CHAN_WIDTH_40:
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rx_status.flag |= RX_FLAG_40MHZ;
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break;
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case RATE_MCS_CHAN_WIDTH_80:
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rx_status.flag |= RX_FLAG_80MHZ;
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break;
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case RATE_MCS_CHAN_WIDTH_160:
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rx_status.flag |= RX_FLAG_160MHZ;
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break;
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}
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if (rate_n_flags & RATE_MCS_SGI_MSK)
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rx_status.flag |= RX_FLAG_SHORT_GI;
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if (rate_n_flags & RATE_HT_MCS_GF_MSK)
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rx_status.flag |= RX_FLAG_HT_GF;
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if (rate_n_flags & RATE_MCS_HT_MSK) {
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rx_status.flag |= RX_FLAG_HT;
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rx_status.rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
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} else if (rate_n_flags & RATE_MCS_VHT_MSK) {
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rx_status.vht_nss =
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((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
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RATE_VHT_MCS_NSS_POS) + 1;
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rx_status.rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
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rx_status.flag |= RX_FLAG_VHT;
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} else {
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rx_status.rate_idx =
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iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
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rx_status.band);
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}
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iwl_mvm_pass_packet_to_mac80211(mvm, hdr, len, ampdu_status,
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rxb, &rx_status);
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return 0;
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}
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static void iwl_mvm_update_rx_statistics(struct iwl_mvm *mvm,
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struct iwl_notif_statistics *stats)
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{
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/*
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* NOTE FW aggregates the statistics - BUT the statistics are cleared
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* when the driver issues REPLY_STATISTICS_CMD 0x9c with CLEAR_STATS
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* bit set.
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*/
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lockdep_assert_held(&mvm->mutex);
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memcpy(&mvm->rx_stats, &stats->rx, sizeof(struct mvm_statistics_rx));
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}
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struct iwl_mvm_stat_data {
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struct iwl_notif_statistics *stats;
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struct iwl_mvm *mvm;
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};
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static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
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struct ieee80211_vif *vif)
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{
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struct iwl_mvm_stat_data *data = _data;
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struct iwl_notif_statistics *stats = data->stats;
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struct iwl_mvm *mvm = data->mvm;
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int sig = -stats->general.beacon_filter_average_energy;
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int last_event;
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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;
|
|
}
|