357 lines
12 KiB
C
357 lines
12 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 - 2013 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 LICENSE.GPL.
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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 - 2013 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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/*
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* iwl_mvm_calc_rssi - calculate the rssi in dBm
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* @phy_info: the phy information for the coming packet
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*/
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static int iwl_mvm_calc_rssi(struct iwl_mvm *mvm,
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struct iwl_rx_phy_info *phy_info)
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{
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u32 rssi_a, rssi_b, rssi_c, max_rssi, agc_db;
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u32 val;
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/* Find max rssi among 3 possible receivers.
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* These values are measured by the Digital Signal Processor (DSP).
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* They should stay fairly constant even as the signal strength varies,
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* if the radio's Automatic Gain Control (AGC) is working right.
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* AGC value (see below) will provide the "interesting" info.
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*/
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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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val = le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_RSSI_C_IDX]);
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rssi_c = (val & IWL_OFDM_RSSI_INBAND_C_MSK) >> IWL_OFDM_RSSI_C_POS;
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val = le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_AGC_IDX]);
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agc_db = (val & IWL_OFDM_AGC_DB_MSK) >> IWL_OFDM_AGC_DB_POS;
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max_rssi = max_t(u32, rssi_a, rssi_b);
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max_rssi = max_t(u32, max_rssi, rssi_c);
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IWL_DEBUG_STATS(mvm, "Rssi In A %d B %d C %d Max %d AGC dB %d\n",
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rssi_a, rssi_b, rssi_c, max_rssi, agc_db);
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/* dBm = max_rssi dB - agc dB - constant.
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* Higher AGC (higher radio gain) means lower signal. */
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return max_rssi - agc_db - IWL_RSSI_OFFSET;
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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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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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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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return 0;
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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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/* Find max signal strength (dBm) among 3 antenna/receiver chains */
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rx_status.signal = iwl_mvm_calc_rssi(mvm, phy_info);
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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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/*
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* "antenna number"
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*
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* It seems that the antenna field in the phy flags value
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* is actually a bit field. This is undefined by radiotap,
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* it wants an actual antenna number but I always get "7"
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* for most legacy frames I receive indicating that the
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* same frame was received on all three RX chains.
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*
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* I think this field should be removed in favor of a
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* new 802.11n radiotap field "RX chains" that is defined
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* as a bitmask.
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*/
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rx_status.antenna = (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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/* 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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