Quelle  phy-ctxt.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright (C) 2012-2014, 2018-2024 Intel Corporation
 * Copyright (C) 2013-2014 Intel Mobile Communications GmbH
 * Copyright (C) 2017 Intel Deutschland GmbH
 */
#include <net/mac80211.h>
#include "fw-api.h"
#include "mvm.h"

/* Maps the driver specific channel width definition to the fw values */
u8 iwl_mvm_get_channel_width(const struct cfg80211_chan_def *chandef)
{
 switch (chandef->width) {
 case NL80211_CHAN_WIDTH_20_NOHT:
 case NL80211_CHAN_WIDTH_20:
  return IWL_PHY_CHANNEL_MODE20;
 case NL80211_CHAN_WIDTH_40:
  return IWL_PHY_CHANNEL_MODE40;
 case NL80211_CHAN_WIDTH_80:
  return IWL_PHY_CHANNEL_MODE80;
 case NL80211_CHAN_WIDTH_160:
  return IWL_PHY_CHANNEL_MODE160;
 case NL80211_CHAN_WIDTH_320:
  return IWL_PHY_CHANNEL_MODE320;
 default:
  WARN(1, "Invalid channel width=%u", chandef->width);
  return IWL_PHY_CHANNEL_MODE20;
 }
}

/*
 * Maps the driver specific control channel position (relative to the center
 * freq) definitions to the fw values
 */
u8 iwl_mvm_get_ctrl_pos(const struct cfg80211_chan_def *chandef)
{
 int offs = chandef->chan->center_freq - chandef->center_freq1;
 int abs_offs = abs(offs);
 u8 ret;

 if (offs == 0) {
  /*
 * The FW is expected to check the control channel position only
 * when in HT/VHT and the channel width is not 20MHz. Return
 * this value as the default one.
 */
  return 0;
 }

 /* this results in a value 0-7, i.e. fitting into 0b0111 */
 ret = (abs_offs - 10) / 20;
 /*
 * But we need the value to be in 0b1011 because 0b0100 is
 * IWL_PHY_CTRL_POS_ABOVE, so shift bit 2 up to land in
 * IWL_PHY_CTRL_POS_OFFS_EXT (0b1000)
 */
 ret = (ret & IWL_PHY_CTRL_POS_OFFS_MSK) |
       ((ret & BIT(2)) << 1);
 /* and add the above bit */
 ret |= (offs > 0) * IWL_PHY_CTRL_POS_ABOVE;

 return ret;
}

/*
 * Construct the generic fields of the PHY context command
 */
static void iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt *ctxt,
         struct iwl_phy_context_cmd *cmd,
         u32 action)
{
 cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id,
           ctxt->color));
 cmd->action = cpu_to_le32(action);
}

static void iwl_mvm_phy_ctxt_set_rxchain(struct iwl_mvm *mvm,
      struct iwl_mvm_phy_ctxt *ctxt,
      __le32 *rxchain_info,
      u8 chains_static,
      u8 chains_dynamic)
{
 u8 active_cnt, idle_cnt;

 /* Set rx the chains */
 idle_cnt = chains_static;
 active_cnt = chains_dynamic;

 /* In scenarios where we only ever use a single-stream rates,
 * i.e. legacy 11b/g/a associations, single-stream APs or even
 * static SMPS, enable both chains to get diversity, improving
 * the case where we're far enough from the AP that attenuation
 * between the two antennas is sufficiently different to impact
 * performance.
 */
 if (active_cnt == 1 && iwl_mvm_rx_diversity_allowed(mvm, ctxt)) {
  idle_cnt = 2;
  active_cnt = 2;
 }

 *rxchain_info = cpu_to_le32(iwl_mvm_get_valid_rx_ant(mvm) <<
     PHY_RX_CHAIN_VALID_POS);
 *rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
 *rxchain_info |= cpu_to_le32(active_cnt <<
      PHY_RX_CHAIN_MIMO_CNT_POS);
#ifdef CONFIG_IWLWIFI_DEBUGFS
 if (unlikely(mvm->dbgfs_rx_phyinfo))
  *rxchain_info = cpu_to_le32(mvm->dbgfs_rx_phyinfo);
#endif
}

/*
 * Add the phy configuration to the PHY context command
 */
static void iwl_mvm_phy_ctxt_cmd_data_v1(struct iwl_mvm *mvm,
      struct iwl_mvm_phy_ctxt *ctxt,
      struct iwl_phy_context_cmd_v1 *cmd,
      const struct cfg80211_chan_def *chandef,
      u8 chains_static, u8 chains_dynamic)
{
 struct iwl_phy_context_cmd_tail *tail =
  iwl_mvm_chan_info_cmd_tail(mvm, &cmd->ci);

 /* Set the channel info data */
 iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);

 iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &tail->rxchain_info,
         chains_static, chains_dynamic);

 tail->txchain_info = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
}

/*
 * Add the phy configuration to the PHY context command
 */
static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm,
          struct iwl_mvm_phy_ctxt *ctxt,
          struct iwl_phy_context_cmd *cmd,
          const struct cfg80211_chan_def *chandef,
          u8 chains_static, u8 chains_dynamic)
{
 cmd->lmac_id = cpu_to_le32(iwl_mvm_get_lmac_id(mvm,
             chandef->chan->band));

 /* Set the channel info data */
 iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);

 /* we only support RLC command version 2 */
 if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP, RLC_CONFIG_CMD), 0) < 2)
  iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &cmd->rxchain_info,
          chains_static, chains_dynamic);
}

int iwl_mvm_phy_send_rlc(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
    u8 chains_static, u8 chains_dynamic)
{
 struct iwl_rlc_config_cmd cmd = {
  .phy_id = cpu_to_le32(ctxt->id),
 };

 /* From version 3, RLC is offloaded to firmware, so the driver no
 * longer needs to send cmd.rlc, note that we are not using any
 * other fields in the command - don't send it.
 */
 if (iwl_mvm_has_rlc_offload(mvm) || ctxt->rlc_disabled)
  return 0;

 if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP,
         RLC_CONFIG_CMD), 0) < 2)
  return 0;

 BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_DRIVER_FORCE !=
       PHY_RX_CHAIN_DRIVER_FORCE_MSK);
 BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_VALID !=
       PHY_RX_CHAIN_VALID_MSK);
 BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_FORCE !=
       PHY_RX_CHAIN_FORCE_SEL_MSK);
 BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_FORCE_MIMO !=
       PHY_RX_CHAIN_FORCE_MIMO_SEL_MSK);
 BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_COUNT != PHY_RX_CHAIN_CNT_MSK);
 BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_MIMO_COUNT !=
       PHY_RX_CHAIN_MIMO_CNT_MSK);

 iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &cmd.rlc.rx_chain_info,
         chains_static, chains_dynamic);

 IWL_DEBUG_FW(mvm, "Send RLC command: phy=%d, rx_chain_info=0x%x\n",
       ctxt->id, cmd.rlc.rx_chain_info);

 return iwl_mvm_send_cmd_pdu(mvm, iwl_cmd_id(RLC_CONFIG_CMD,
          DATA_PATH_GROUP, 2),
        0, sizeof(cmd), &cmd);
}

/*
 * Send a command to apply the current phy configuration. The command is send
 * only if something in the configuration changed: in case that this is the
 * first time that the phy configuration is applied or in case that the phy
 * configuration changed from the previous apply.
 */
static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm,
      struct iwl_mvm_phy_ctxt *ctxt,
      const struct cfg80211_chan_def *chandef,
      const struct cfg80211_chan_def *ap,
      u8 chains_static, u8 chains_dynamic,
      u32 action)
{
 int ret;
 int ver = iwl_fw_lookup_cmd_ver(mvm->fw, PHY_CONTEXT_CMD, 1);

 if (ver < 5 || !ap || !ap->chan)
  ap = NULL;

 if (ver >= 3 && ver <= 6) {
  struct iwl_phy_context_cmd cmd = {};

  /* Set the command header fields */
  iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action);

  /* Set the command data */
  iwl_mvm_phy_ctxt_cmd_data(mvm, ctxt, &cmd, chandef,
       chains_static,
       chains_dynamic);

  if (ap) {
   cmd.sbb_bandwidth = iwl_mvm_get_channel_width(ap);
   cmd.sbb_ctrl_channel_loc = iwl_mvm_get_ctrl_pos(ap);
  }

  if (ver == 6)
   cmd.puncture_mask = cpu_to_le16(chandef->punctured);

  ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD,
        0, sizeof(cmd), &cmd);
 } else if (ver < 3) {
  struct iwl_phy_context_cmd_v1 cmd = {};
  u16 len = sizeof(cmd) - iwl_mvm_chan_info_padding(mvm);

  /* Set the command header fields */
  iwl_mvm_phy_ctxt_cmd_hdr(ctxt,
      (struct iwl_phy_context_cmd *)&cmd,
      action);

  /* Set the command data */
  iwl_mvm_phy_ctxt_cmd_data_v1(mvm, ctxt, &cmd, chandef,
          chains_static,
          chains_dynamic);
  ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD,
        0, len, &cmd);
 } else {
  IWL_ERR(mvm, "PHY ctxt cmd error ver %d not supported\n", ver);
  return -EOPNOTSUPP;
 }


 if (ret) {
  IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
  return ret;
 }

 if (action != FW_CTXT_ACTION_REMOVE)
  return iwl_mvm_phy_send_rlc(mvm, ctxt, chains_static,
         chains_dynamic);

 return 0;
}

/*
 * Send a command to add a PHY context based on the current HW configuration.
 */
int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
    const struct cfg80211_chan_def *chandef,
    const struct cfg80211_chan_def *ap,
    u8 chains_static, u8 chains_dynamic)
{
 int ret;

 WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
  ctxt->ref);
 lockdep_assert_held(&mvm->mutex);

 ctxt->channel = chandef->chan;
 ctxt->width = chandef->width;
 ctxt->center_freq1 = chandef->center_freq1;

 ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef, ap,
         chains_static, chains_dynamic,
         FW_CTXT_ACTION_ADD);

 if (ret)
  return ret;

 ctxt->ref++;

 return 0;
}

/*
 * Update the number of references to the given PHY context. This is valid only
 * in case the PHY context was already created, i.e., its reference count > 0.
 */
void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
{
 lockdep_assert_held(&mvm->mutex);

 /* If we were taking the first ref, we should have
 * called iwl_mvm_phy_ctxt_add.
 */
 WARN_ON(!ctxt->ref);
 ctxt->ref++;
}

/*
 * Send a command to modify the PHY context based on the current HW
 * configuration. Note that the function does not check that the configuration
 * changed.
 */
int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
        const struct cfg80211_chan_def *chandef,
        const struct cfg80211_chan_def *ap,
        u8 chains_static, u8 chains_dynamic)
{
 enum iwl_ctxt_action action = FW_CTXT_ACTION_MODIFY;

 lockdep_assert_held(&mvm->mutex);

 if (WARN_ON_ONCE(!ctxt->ref))
  return -EINVAL;

 if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP,
         RLC_CONFIG_CMD), 0) >= 2 &&
     ctxt->channel == chandef->chan &&
     ctxt->width == chandef->width &&
     ctxt->center_freq1 == chandef->center_freq1)
  return iwl_mvm_phy_send_rlc(mvm, ctxt, chains_static,
         chains_dynamic);

 if (fw_has_capa(&mvm->fw->ucode_capa,
   IWL_UCODE_TLV_CAPA_BINDING_CDB_SUPPORT) &&
     ctxt->channel->band != chandef->chan->band) {
  int ret;

  /* ... remove it here ...*/
  ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef, NULL,
          chains_static, chains_dynamic,
          FW_CTXT_ACTION_REMOVE);
  if (ret)
   return ret;

  /* ... and proceed to add it again */
  action = FW_CTXT_ACTION_ADD;
 }

 ctxt->channel = chandef->chan;
 ctxt->width = chandef->width;
 ctxt->center_freq1 = chandef->center_freq1;

 return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef, ap,
          chains_static, chains_dynamic,
          action);
}

void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
{
 struct cfg80211_chan_def chandef;
 lockdep_assert_held(&mvm->mutex);

 if (WARN_ON_ONCE(!ctxt))
  return;

 ctxt->ref--;

 if (ctxt->ref)
  return;

 cfg80211_chandef_create(&chandef, ctxt->channel, NL80211_CHAN_NO_HT);

 iwl_mvm_phy_ctxt_apply(mvm, ctxt, &chandef, NULL, 1, 1,
          FW_CTXT_ACTION_REMOVE);
}

static void iwl_mvm_binding_iterator(void *_data, u8 *mac,
         struct ieee80211_vif *vif)
{
 unsigned long *data = _data;
 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

 if (!mvmvif->deflink.phy_ctxt)
  return;

 if (vif->type == NL80211_IFTYPE_STATION ||
     vif->type == NL80211_IFTYPE_AP)
  __set_bit(mvmvif->deflink.phy_ctxt->id, data);
}

int iwl_mvm_phy_ctx_count(struct iwl_mvm *mvm)
{
 unsigned long phy_ctxt_counter = 0;

 ieee80211_iterate_active_interfaces_atomic(mvm->hw,
         IEEE80211_IFACE_ITER_NORMAL,
         iwl_mvm_binding_iterator,
         &phy_ctxt_counter);

 return hweight8(phy_ctxt_counter);
}