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ubuntu-linux-kernel/drivers/net/wireless/intel/iwlwifi/dvm/rx.c

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/******************************************************************************
*
* Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
* Copyright(c) 2015 Intel Deutschland GmbH
*
* Portions of this file are derived from the ipw3945 project, as well
* as portionhelp of the ieee80211 subsystem header files.
*
* 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 LICENSE.
*
* Contact Information:
* Intel Linux Wireless <linuxwifi@intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
*****************************************************************************/
#include <linux/etherdevice.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>
#include "iwl-trans.h"
#include "iwl-io.h"
#include "dev.h"
#include "calib.h"
#include "agn.h"
/******************************************************************************
*
* Generic RX handler implementations
*
******************************************************************************/
static void iwlagn_rx_reply_error(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_error_resp *err_resp = (void *)pkt->data;
IWL_ERR(priv, "Error Reply type 0x%08X cmd REPLY_ERROR (0x%02X) "
"seq 0x%04X ser 0x%08X\n",
le32_to_cpu(err_resp->error_type),
err_resp->cmd_id,
le16_to_cpu(err_resp->bad_cmd_seq_num),
le32_to_cpu(err_resp->error_info));
}
static void iwlagn_rx_csa(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_csa_notification *csa = (void *)pkt->data;
/*
* MULTI-FIXME
* See iwlagn_mac_channel_switch.
*/
struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
struct iwl_rxon_cmd *rxon = (void *)&ctx->active;
if (!test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status))
return;
if (!le32_to_cpu(csa->status) && csa->channel == priv->switch_channel) {
rxon->channel = csa->channel;
ctx->staging.channel = csa->channel;
IWL_DEBUG_11H(priv, "CSA notif: channel %d\n",
le16_to_cpu(csa->channel));
iwl_chswitch_done(priv, true);
} else {
IWL_ERR(priv, "CSA notif (fail) : channel %d\n",
le16_to_cpu(csa->channel));
iwl_chswitch_done(priv, false);
}
}
static void iwlagn_rx_spectrum_measure_notif(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_spectrum_notification *report = (void *)pkt->data;
if (!report->state) {
IWL_DEBUG_11H(priv,
"Spectrum Measure Notification: Start\n");
return;
}
memcpy(&priv->measure_report, report, sizeof(*report));
priv->measurement_status |= MEASUREMENT_READY;
}
static void iwlagn_rx_pm_sleep_notif(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb)
{
#ifdef CONFIG_IWLWIFI_DEBUG
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_sleep_notification *sleep = (void *)pkt->data;
IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n",
sleep->pm_sleep_mode, sleep->pm_wakeup_src);
#endif
}
static void iwlagn_rx_pm_debug_statistics_notif(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
u32 __maybe_unused len = iwl_rx_packet_len(pkt);
IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled "
"notification for PM_DEBUG_STATISTIC_NOTIFIC:\n", len);
iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->data, len);
}
static void iwlagn_rx_beacon_notif(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwlagn_beacon_notif *beacon = (void *)pkt->data;
#ifdef CONFIG_IWLWIFI_DEBUG
u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status);
u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);
IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d "
"tsf:0x%.8x%.8x rate:%d\n",
status & TX_STATUS_MSK,
beacon->beacon_notify_hdr.failure_frame,
le32_to_cpu(beacon->ibss_mgr_status),
le32_to_cpu(beacon->high_tsf),
le32_to_cpu(beacon->low_tsf), rate);
#endif
priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status);
}
/**
* iwl_good_plcp_health - checks for plcp error.
*
* When the plcp error is exceeding the thresholds, reset the radio
* to improve the throughput.
*/
static bool iwlagn_good_plcp_health(struct iwl_priv *priv,
struct statistics_rx_phy *cur_ofdm,
struct statistics_rx_ht_phy *cur_ofdm_ht,
unsigned int msecs)
{
int delta;
int threshold = priv->plcp_delta_threshold;
if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
return true;
}
delta = le32_to_cpu(cur_ofdm->plcp_err) -
le32_to_cpu(priv->statistics.rx_ofdm.plcp_err) +
le32_to_cpu(cur_ofdm_ht->plcp_err) -
le32_to_cpu(priv->statistics.rx_ofdm_ht.plcp_err);
/* Can be negative if firmware reset statistics */
if (delta <= 0)
return true;
if ((delta * 100 / msecs) > threshold) {
IWL_DEBUG_RADIO(priv,
"plcp health threshold %u delta %d msecs %u\n",
threshold, delta, msecs);
return false;
}
return true;
}
int iwl_force_rf_reset(struct iwl_priv *priv, bool external)
{
struct iwl_rf_reset *rf_reset;
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
return -EAGAIN;
if (!iwl_is_any_associated(priv)) {
IWL_DEBUG_SCAN(priv, "force reset rejected: not associated\n");
return -ENOLINK;
}
rf_reset = &priv->rf_reset;
rf_reset->reset_request_count++;
if (!external && rf_reset->last_reset_jiffies &&
time_after(rf_reset->last_reset_jiffies +
IWL_DELAY_NEXT_FORCE_RF_RESET, jiffies)) {
IWL_DEBUG_INFO(priv, "RF reset rejected\n");
rf_reset->reset_reject_count++;
return -EAGAIN;
}
rf_reset->reset_success_count++;
rf_reset->last_reset_jiffies = jiffies;
/*
* There is no easy and better way to force reset the radio,
* the only known method is switching channel which will force to
* reset and tune the radio.
* Use internal short scan (single channel) operation to should
* achieve this objective.
* Driver should reset the radio when number of consecutive missed
* beacon, or any other uCode error condition detected.
*/
IWL_DEBUG_INFO(priv, "perform radio reset.\n");
iwl_internal_short_hw_scan(priv);
return 0;
}
static void iwlagn_recover_from_statistics(struct iwl_priv *priv,
struct statistics_rx_phy *cur_ofdm,
struct statistics_rx_ht_phy *cur_ofdm_ht,
struct statistics_tx *tx,
unsigned long stamp)
{
unsigned int msecs;
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
return;
msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies);
/* Only gather statistics and update time stamp when not associated */
if (!iwl_is_any_associated(priv))
return;
/* Do not check/recover when do not have enough statistics data */
if (msecs < 99)
return;
if (!iwlagn_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs))
iwl_force_rf_reset(priv, false);
}
/* Calculate noise level, based on measurements during network silence just
* before arriving beacon. This measurement can be done only if we know
* exactly when to expect beacons, therefore only when we're associated. */
static void iwlagn_rx_calc_noise(struct iwl_priv *priv)
{
struct statistics_rx_non_phy *rx_info;
int num_active_rx = 0;
int total_silence = 0;
int bcn_silence_a, bcn_silence_b, bcn_silence_c;
int last_rx_noise;
rx_info = &priv->statistics.rx_non_phy;
bcn_silence_a =
le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
bcn_silence_b =
le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
bcn_silence_c =
le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
if (bcn_silence_a) {
total_silence += bcn_silence_a;
num_active_rx++;
}
if (bcn_silence_b) {
total_silence += bcn_silence_b;
num_active_rx++;
}
if (bcn_silence_c) {
total_silence += bcn_silence_c;
num_active_rx++;
}
/* Average among active antennas */
if (num_active_rx)
last_rx_noise = (total_silence / num_active_rx) - 107;
else
last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
bcn_silence_a, bcn_silence_b, bcn_silence_c,
last_rx_noise);
}
#ifdef CONFIG_IWLWIFI_DEBUGFS
/*
* based on the assumption of all statistics counter are in DWORD
* FIXME: This function is for debugging, do not deal with
* the case of counters roll-over.
*/
static void accum_stats(__le32 *prev, __le32 *cur, __le32 *delta,
__le32 *max_delta, __le32 *accum, int size)
{
int i;
for (i = 0;
i < size / sizeof(__le32);
i++, prev++, cur++, delta++, max_delta++, accum++) {
if (le32_to_cpu(*cur) > le32_to_cpu(*prev)) {
*delta = cpu_to_le32(
le32_to_cpu(*cur) - le32_to_cpu(*prev));
le32_add_cpu(accum, le32_to_cpu(*delta));
if (le32_to_cpu(*delta) > le32_to_cpu(*max_delta))
*max_delta = *delta;
}
}
}
static void
iwlagn_accumulative_statistics(struct iwl_priv *priv,
struct statistics_general_common *common,
struct statistics_rx_non_phy *rx_non_phy,
struct statistics_rx_phy *rx_ofdm,
struct statistics_rx_ht_phy *rx_ofdm_ht,
struct statistics_rx_phy *rx_cck,
struct statistics_tx *tx,
struct statistics_bt_activity *bt_activity)
{
#define ACCUM(_name) \
accum_stats((__le32 *)&priv->statistics._name, \
(__le32 *)_name, \
(__le32 *)&priv->delta_stats._name, \
(__le32 *)&priv->max_delta_stats._name, \
(__le32 *)&priv->accum_stats._name, \
sizeof(*_name));
ACCUM(common);
ACCUM(rx_non_phy);
ACCUM(rx_ofdm);
ACCUM(rx_ofdm_ht);
ACCUM(rx_cck);
ACCUM(tx);
if (bt_activity)
ACCUM(bt_activity);
#undef ACCUM
}
#else
static inline void
iwlagn_accumulative_statistics(struct iwl_priv *priv,
struct statistics_general_common *common,
struct statistics_rx_non_phy *rx_non_phy,
struct statistics_rx_phy *rx_ofdm,
struct statistics_rx_ht_phy *rx_ofdm_ht,
struct statistics_rx_phy *rx_cck,
struct statistics_tx *tx,
struct statistics_bt_activity *bt_activity)
{
}
#endif
static void iwlagn_rx_statistics(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb)
{
unsigned long stamp = jiffies;
const int reg_recalib_period = 60;
int change;
struct iwl_rx_packet *pkt = rxb_addr(rxb);
u32 len = iwl_rx_packet_payload_len(pkt);
__le32 *flag;
struct statistics_general_common *common;
struct statistics_rx_non_phy *rx_non_phy;
struct statistics_rx_phy *rx_ofdm;
struct statistics_rx_ht_phy *rx_ofdm_ht;
struct statistics_rx_phy *rx_cck;
struct statistics_tx *tx;
struct statistics_bt_activity *bt_activity;
IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n",
len);
spin_lock(&priv->statistics.lock);
if (len == sizeof(struct iwl_bt_notif_statistics)) {
struct iwl_bt_notif_statistics *stats;
stats = (void *)&pkt->data;
flag = &stats->flag;
common = &stats->general.common;
rx_non_phy = &stats->rx.general.common;
rx_ofdm = &stats->rx.ofdm;
rx_ofdm_ht = &stats->rx.ofdm_ht;
rx_cck = &stats->rx.cck;
tx = &stats->tx;
bt_activity = &stats->general.activity;
#ifdef CONFIG_IWLWIFI_DEBUGFS
/* handle this exception directly */
priv->statistics.num_bt_kills = stats->rx.general.num_bt_kills;
le32_add_cpu(&priv->statistics.accum_num_bt_kills,
le32_to_cpu(stats->rx.general.num_bt_kills));
#endif
} else if (len == sizeof(struct iwl_notif_statistics)) {
struct iwl_notif_statistics *stats;
stats = (void *)&pkt->data;
flag = &stats->flag;
common = &stats->general.common;
rx_non_phy = &stats->rx.general;
rx_ofdm = &stats->rx.ofdm;
rx_ofdm_ht = &stats->rx.ofdm_ht;
rx_cck = &stats->rx.cck;
tx = &stats->tx;
bt_activity = NULL;
} else {
WARN_ONCE(1, "len %d doesn't match BT (%zu) or normal (%zu)\n",
len, sizeof(struct iwl_bt_notif_statistics),
sizeof(struct iwl_notif_statistics));
spin_unlock(&priv->statistics.lock);
return;
}
change = common->temperature != priv->statistics.common.temperature ||
(*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
(priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK);
iwlagn_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm,
rx_ofdm_ht, rx_cck, tx, bt_activity);
iwlagn_recover_from_statistics(priv, rx_ofdm, rx_ofdm_ht, tx, stamp);
priv->statistics.flag = *flag;
memcpy(&priv->statistics.common, common, sizeof(*common));
memcpy(&priv->statistics.rx_non_phy, rx_non_phy, sizeof(*rx_non_phy));
memcpy(&priv->statistics.rx_ofdm, rx_ofdm, sizeof(*rx_ofdm));
memcpy(&priv->statistics.rx_ofdm_ht, rx_ofdm_ht, sizeof(*rx_ofdm_ht));
memcpy(&priv->statistics.rx_cck, rx_cck, sizeof(*rx_cck));
memcpy(&priv->statistics.tx, tx, sizeof(*tx));
#ifdef CONFIG_IWLWIFI_DEBUGFS
if (bt_activity)
memcpy(&priv->statistics.bt_activity, bt_activity,
sizeof(*bt_activity));
#endif
priv->rx_statistics_jiffies = stamp;
set_bit(STATUS_STATISTICS, &priv->status);
/* Reschedule the statistics timer to occur in
* reg_recalib_period seconds to ensure we get a
* thermal update even if the uCode doesn't give
* us one */
mod_timer(&priv->statistics_periodic, jiffies +
msecs_to_jiffies(reg_recalib_period * 1000));
if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
(pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
iwlagn_rx_calc_noise(priv);
queue_work(priv->workqueue, &priv->run_time_calib_work);
}
if (priv->lib->temperature && change)
priv->lib->temperature(priv);
spin_unlock(&priv->statistics.lock);
}
static void iwlagn_rx_reply_statistics(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_notif_statistics *stats = (void *)pkt->data;
if (le32_to_cpu(stats->flag) & UCODE_STATISTICS_CLEAR_MSK) {
#ifdef CONFIG_IWLWIFI_DEBUGFS
memset(&priv->accum_stats, 0,
sizeof(priv->accum_stats));
memset(&priv->delta_stats, 0,
sizeof(priv->delta_stats));
memset(&priv->max_delta_stats, 0,
sizeof(priv->max_delta_stats));
#endif
IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
}
iwlagn_rx_statistics(priv, rxb);
}
/* Handle notification from uCode that card's power state is changing
* due to software, hardware, or critical temperature RFKILL */
static void iwlagn_rx_card_state_notif(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_card_state_notif *card_state_notif = (void *)pkt->data;
u32 flags = le32_to_cpu(card_state_notif->flags);
unsigned long status = priv->status;
IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n",
(flags & HW_CARD_DISABLED) ? "Kill" : "On",
(flags & SW_CARD_DISABLED) ? "Kill" : "On",
(flags & CT_CARD_DISABLED) ?
"Reached" : "Not reached");
if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED |
CT_CARD_DISABLED)) {
iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_SET,
CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C,
HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
if (!(flags & RXON_CARD_DISABLED)) {
iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_CLR,
CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C,
HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
}
if (flags & CT_CARD_DISABLED)
iwl_tt_enter_ct_kill(priv);
}
if (!(flags & CT_CARD_DISABLED))
iwl_tt_exit_ct_kill(priv);
if (flags & HW_CARD_DISABLED)
set_bit(STATUS_RF_KILL_HW, &priv->status);
else
clear_bit(STATUS_RF_KILL_HW, &priv->status);
if (!(flags & RXON_CARD_DISABLED))
iwl_scan_cancel(priv);
if ((test_bit(STATUS_RF_KILL_HW, &status) !=
test_bit(STATUS_RF_KILL_HW, &priv->status)))
wiphy_rfkill_set_hw_state(priv->hw->wiphy,
test_bit(STATUS_RF_KILL_HW, &priv->status));
}
static void iwlagn_rx_missed_beacon_notif(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_missed_beacon_notif *missed_beacon = (void *)pkt->data;
if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
priv->missed_beacon_threshold) {
IWL_DEBUG_CALIB(priv,
"missed bcn cnsq %d totl %d rcd %d expctd %d\n",
le32_to_cpu(missed_beacon->consecutive_missed_beacons),
le32_to_cpu(missed_beacon->total_missed_becons),
le32_to_cpu(missed_beacon->num_recvd_beacons),
le32_to_cpu(missed_beacon->num_expected_beacons));
if (!test_bit(STATUS_SCANNING, &priv->status))
iwl_init_sensitivity(priv);
}
}
/* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
* This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
static void iwlagn_rx_reply_rx_phy(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
priv->last_phy_res_valid = true;
priv->ampdu_ref++;
memcpy(&priv->last_phy_res, pkt->data,
sizeof(struct iwl_rx_phy_res));
}
/*
* returns non-zero if packet should be dropped
*/
static int iwlagn_set_decrypted_flag(struct iwl_priv *priv,
struct ieee80211_hdr *hdr,
u32 decrypt_res,
struct ieee80211_rx_status *stats)
{
u16 fc = le16_to_cpu(hdr->frame_control);
/*
* All contexts have the same setting here due to it being
* a module parameter, so OK to check any context.
*/
if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags &
RXON_FILTER_DIS_DECRYPT_MSK)
return 0;
if (!(fc & IEEE80211_FCTL_PROTECTED))
return 0;
IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
case RX_RES_STATUS_SEC_TYPE_TKIP:
/* The uCode has got a bad phase 1 Key, pushes the packet.
* Decryption will be done in SW. */
if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
RX_RES_STATUS_BAD_KEY_TTAK)
break;
case RX_RES_STATUS_SEC_TYPE_WEP:
if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
RX_RES_STATUS_BAD_ICV_MIC) {
/* bad ICV, the packet is destroyed since the
* decryption is inplace, drop it */
IWL_DEBUG_RX(priv, "Packet destroyed\n");
return -1;
}
case RX_RES_STATUS_SEC_TYPE_CCMP:
if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
RX_RES_STATUS_DECRYPT_OK) {
IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
stats->flag |= RX_FLAG_DECRYPTED;
}
break;
default:
break;
}
return 0;
}
static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv,
struct ieee80211_hdr *hdr,
u16 len,
u32 ampdu_status,
struct iwl_rx_cmd_buffer *rxb,
struct ieee80211_rx_status *stats)
{
struct sk_buff *skb;
__le16 fc = hdr->frame_control;
struct iwl_rxon_context *ctx;
unsigned int hdrlen, fraglen;
/* We only process data packets if the interface is open */
if (unlikely(!priv->is_open)) {
IWL_DEBUG_DROP_LIMIT(priv,
"Dropping packet while interface is not open.\n");
return;
}
/* In case of HW accelerated crypto and bad decryption, drop */
if (!iwlwifi_mod_params.swcrypto &&
iwlagn_set_decrypted_flag(priv, hdr, ampdu_status, stats))
return;
/* Dont use dev_alloc_skb(), we'll have enough headroom once
* ieee80211_hdr pulled.
*/
skb = alloc_skb(128, GFP_ATOMIC);
if (!skb) {
IWL_ERR(priv, "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);
skb_put_data(skb, 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);
}
/*
* Wake any queues that were stopped due to a passive channel tx
* failure. This can happen because the regulatory enforcement in
* the device waits for a beacon before allowing transmission,
* sometimes even after already having transmitted frames for the
* association because the new RXON may reset the information.
*/
if (unlikely(ieee80211_is_beacon(fc) && priv->passive_no_rx)) {
for_each_context(priv, ctx) {
if (!ether_addr_equal(hdr->addr3,
ctx->active.bssid_addr))
continue;
iwlagn_lift_passive_no_rx(priv);
}
}
memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
ieee80211_rx_napi(priv->hw, NULL, skb, priv->napi);
}
static u32 iwlagn_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
{
u32 decrypt_out = 0;
if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
RX_RES_STATUS_STATION_FOUND)
decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
/* packet was not encrypted */
if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
RX_RES_STATUS_SEC_TYPE_NONE)
return decrypt_out;
/* packet was encrypted with unknown alg */
if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
RX_RES_STATUS_SEC_TYPE_ERR)
return decrypt_out;
/* decryption was not done in HW */
if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
RX_MPDU_RES_STATUS_DEC_DONE_MSK)
return decrypt_out;
switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
case RX_RES_STATUS_SEC_TYPE_CCMP:
/* alg is CCM: check MIC only */
if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
/* Bad MIC */
decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
else
decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
break;
case RX_RES_STATUS_SEC_TYPE_TKIP:
if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
/* Bad TTAK */
decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
break;
}
/* fall through if TTAK OK */
default:
if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
else
decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
break;
}
IWL_DEBUG_RX(priv, "decrypt_in:0x%x decrypt_out = 0x%x\n",
decrypt_in, decrypt_out);
return decrypt_out;
}
/* Calc max signal level (dBm) among 3 possible receivers */
static int iwlagn_calc_rssi(struct iwl_priv *priv,
struct iwl_rx_phy_res *rx_resp)
{
/* data from PHY/DSP regarding signal strength, etc.,
* contents are always there, not configurable by host
*/
struct iwlagn_non_cfg_phy *ncphy =
(struct iwlagn_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
u32 val, rssi_a, rssi_b, rssi_c, max_rssi;
u8 agc;
val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_AGC_IDX]);
agc = (val & IWLAGN_OFDM_AGC_MSK) >> IWLAGN_OFDM_AGC_BIT_POS;
/* Find max rssi among 3 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(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_AB_IDX]);
rssi_a = (val & IWLAGN_OFDM_RSSI_INBAND_A_BITMSK) >>
IWLAGN_OFDM_RSSI_A_BIT_POS;
rssi_b = (val & IWLAGN_OFDM_RSSI_INBAND_B_BITMSK) >>
IWLAGN_OFDM_RSSI_B_BIT_POS;
val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_C_IDX]);
rssi_c = (val & IWLAGN_OFDM_RSSI_INBAND_C_BITMSK) >>
IWLAGN_OFDM_RSSI_C_BIT_POS;
max_rssi = max_t(u32, rssi_a, rssi_b);
max_rssi = max_t(u32, max_rssi, rssi_c);
IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n",
rssi_a, rssi_b, rssi_c, max_rssi, agc);
/* dBm = max_rssi dB - agc dB - constant.
* Higher AGC (higher radio gain) means lower signal. */
return max_rssi - agc - IWLAGN_RSSI_OFFSET;
}
/* Called for REPLY_RX_MPDU_CMD */
static void iwlagn_rx_reply_rx(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb)
{
struct ieee80211_hdr *header;
struct ieee80211_rx_status rx_status = {};
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_rx_phy_res *phy_res;
__le32 rx_pkt_status;
struct iwl_rx_mpdu_res_start *amsdu;
u32 len;
u32 ampdu_status;
u32 rate_n_flags;
if (!priv->last_phy_res_valid) {
IWL_ERR(priv, "MPDU frame without cached PHY data\n");
return;
}
phy_res = &priv->last_phy_res;
amsdu = (struct iwl_rx_mpdu_res_start *)pkt->data;
header = (struct ieee80211_hdr *)(pkt->data + sizeof(*amsdu));
len = le16_to_cpu(amsdu->byte_count);
rx_pkt_status = *(__le32 *)(pkt->data + sizeof(*amsdu) + len);
ampdu_status = iwlagn_translate_rx_status(priv,
le32_to_cpu(rx_pkt_status));
if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d\n",
phy_res->cfg_phy_cnt);
return;
}
if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
!(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
le32_to_cpu(rx_pkt_status));
return;
}
/* This will be used in several places later */
rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
/* rx_status carries information about the packet to mac80211 */
rx_status.mactime = le64_to_cpu(phy_res->timestamp);
rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
rx_status.freq =
ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel),
rx_status.band);
rx_status.rate_idx =
iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
rx_status.flag = 0;
/* TSF isn't reliable. In order to allow smooth user experience,
* this W/A doesn't propagate it to the mac80211 */
/*rx_status.flag |= RX_FLAG_MACTIME_START;*/
priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
/* Find max signal strength (dBm) among 3 antenna/receiver chains */
rx_status.signal = iwlagn_calc_rssi(priv, phy_res);
IWL_DEBUG_STATS_LIMIT(priv, "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_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
>> RX_RES_PHY_FLAGS_ANTENNA_POS;
/* set the preamble flag if appropriate */
if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
rx_status.enc_flags |= RX_ENC_FLAG_SHORTPRE;
if (phy_res->phy_flags & RX_RES_PHY_FLAGS_AGG_MSK) {
/*
* 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 = priv->ampdu_ref;
}
/* Set up the HT phy flags */
if (rate_n_flags & RATE_MCS_HT_MSK)
rx_status.encoding = RX_ENC_HT;
if (rate_n_flags & RATE_MCS_HT40_MSK)
rx_status.bw = RATE_INFO_BW_40;
else
rx_status.bw = RATE_INFO_BW_20;
if (rate_n_flags & RATE_MCS_SGI_MSK)
rx_status.enc_flags |= RX_ENC_FLAG_SHORT_GI;
if (rate_n_flags & RATE_MCS_GF_MSK)
rx_status.enc_flags |= RX_ENC_FLAG_HT_GF;
iwlagn_pass_packet_to_mac80211(priv, header, len, ampdu_status,
rxb, &rx_status);
}
static void iwlagn_rx_noa_notification(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb)
{
struct iwl_wipan_noa_data *new_data, *old_data;
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_wipan_noa_notification *noa_notif = (void *)pkt->data;
/* no condition -- we're in softirq */
old_data = rcu_dereference_protected(priv->noa_data, true);
if (noa_notif->noa_active) {
u32 len = le16_to_cpu(noa_notif->noa_attribute.length);
u32 copylen = len;
/* EID, len, OUI, subtype */
len += 1 + 1 + 3 + 1;
/* P2P id, P2P length */
len += 1 + 2;
copylen += 1 + 2;
new_data = kmalloc(sizeof(*new_data) + len, GFP_ATOMIC);
if (new_data) {
new_data->length = len;
new_data->data[0] = WLAN_EID_VENDOR_SPECIFIC;
new_data->data[1] = len - 2; /* not counting EID, len */
new_data->data[2] = (WLAN_OUI_WFA >> 16) & 0xff;
new_data->data[3] = (WLAN_OUI_WFA >> 8) & 0xff;
new_data->data[4] = (WLAN_OUI_WFA >> 0) & 0xff;
new_data->data[5] = WLAN_OUI_TYPE_WFA_P2P;
memcpy(&new_data->data[6], &noa_notif->noa_attribute,
copylen);
}
} else
new_data = NULL;
rcu_assign_pointer(priv->noa_data, new_data);
if (old_data)
kfree_rcu(old_data, rcu_head);
}
/**
* iwl_setup_rx_handlers - Initialize Rx handler callbacks
*
* Setup the RX handlers for each of the reply types sent from the uCode
* to the host.
*/
void iwl_setup_rx_handlers(struct iwl_priv *priv)
{
void (**handlers)(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb);
handlers = priv->rx_handlers;
handlers[REPLY_ERROR] = iwlagn_rx_reply_error;
handlers[CHANNEL_SWITCH_NOTIFICATION] = iwlagn_rx_csa;
handlers[SPECTRUM_MEASURE_NOTIFICATION] =
iwlagn_rx_spectrum_measure_notif;
handlers[PM_SLEEP_NOTIFICATION] = iwlagn_rx_pm_sleep_notif;
handlers[PM_DEBUG_STATISTIC_NOTIFIC] =
iwlagn_rx_pm_debug_statistics_notif;
handlers[BEACON_NOTIFICATION] = iwlagn_rx_beacon_notif;
handlers[REPLY_ADD_STA] = iwl_add_sta_callback;
handlers[REPLY_WIPAN_NOA_NOTIFICATION] = iwlagn_rx_noa_notification;
/*
* The same handler is used for both the REPLY to a discrete
* statistics request from the host as well as for the periodic
* statistics notifications (after received beacons) from the uCode.
*/
handlers[REPLY_STATISTICS_CMD] = iwlagn_rx_reply_statistics;
handlers[STATISTICS_NOTIFICATION] = iwlagn_rx_statistics;
iwl_setup_rx_scan_handlers(priv);
handlers[CARD_STATE_NOTIFICATION] = iwlagn_rx_card_state_notif;
handlers[MISSED_BEACONS_NOTIFICATION] =
iwlagn_rx_missed_beacon_notif;
/* Rx handlers */
handlers[REPLY_RX_PHY_CMD] = iwlagn_rx_reply_rx_phy;
handlers[REPLY_RX_MPDU_CMD] = iwlagn_rx_reply_rx;
/* block ack */
handlers[REPLY_COMPRESSED_BA] =
iwlagn_rx_reply_compressed_ba;
priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx;
/* set up notification wait support */
iwl_notification_wait_init(&priv->notif_wait);
/* Set up BT Rx handlers */
if (priv->lib->bt_params)
iwlagn_bt_rx_handler_setup(priv);
}
void iwl_rx_dispatch(struct iwl_op_mode *op_mode, struct napi_struct *napi,
struct iwl_rx_cmd_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
/*
* Do the notification wait before RX handlers so
* even if the RX handler consumes the RXB we have
* access to it in the notification wait entry.
*/
iwl_notification_wait_notify(&priv->notif_wait, pkt);
/* Based on type of command response or notification,
* handle those that need handling via function in
* rx_handlers table. See iwl_setup_rx_handlers() */
if (priv->rx_handlers[pkt->hdr.cmd]) {
priv->rx_handlers_stats[pkt->hdr.cmd]++;
priv->rx_handlers[pkt->hdr.cmd](priv, rxb);
} else {
/* No handling needed */
IWL_DEBUG_RX(priv, "No handler needed for %s, 0x%02x\n",
iwl_get_cmd_string(priv->trans,
iwl_cmd_id(pkt->hdr.cmd,
0, 0)),
pkt->hdr.cmd);
}
}
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