drivers/net/wireless/iwlwifi/mvm/binding.c

   1 /******************************************************************************
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   6  * GPL LICENSE SUMMARY
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   8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
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  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
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  33  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
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  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  62  *****************************************************************************/
  63
  64 #include <net/mac80211.h>
  65 #include "fw-api.h"
  66 #include "mvm.h"
  67
  68 struct iwl_mvm_iface_iterator_data {
  69         struct ieee80211_vif *ignore_vif;
  70         int idx;
  71
  72         struct iwl_mvm_phy_ctxt *phyctxt;
  73
  74         u16 ids[MAX_MACS_IN_BINDING];
  75         u16 colors[MAX_MACS_IN_BINDING];
  76 };
  77
  78 static int iwl_mvm_binding_cmd(struct iwl_mvm *mvm, u32 action,
  79                                struct iwl_mvm_iface_iterator_data *data)
  80 {
  81         struct iwl_binding_cmd cmd;
  82         struct iwl_mvm_phy_ctxt *phyctxt = data->phyctxt;
  83         int i, ret;
  84         u32 status;
  85
  86         memset(&cmd, 0, sizeof(cmd));
  87
  88         cmd.id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(phyctxt->id,
  89                                                            phyctxt->color));
  90         cmd.action = cpu_to_le32(action);
  91         cmd.phy = cpu_to_le32(FW_CMD_ID_AND_COLOR(phyctxt->id,
  92                                                   phyctxt->color));
  93
  94         for (i = 0; i < MAX_MACS_IN_BINDING; i++)
  95                 cmd.macs[i] = cpu_to_le32(FW_CTXT_INVALID);
  96         for (i = 0; i < data->idx; i++)
  97                 cmd.macs[i] = cpu_to_le32(FW_CMD_ID_AND_COLOR(data->ids[i],
  98                                                               data->colors[i]));
  99
 100         status = 0;
 101         ret = iwl_mvm_send_cmd_pdu_status(mvm, BINDING_CONTEXT_CMD,
 102                                           sizeof(cmd), &cmd, &status);
 103         if (ret) {
 104                 IWL_ERR(mvm, "Failed to send binding (action:%d): %d\n",
 105                         action, ret);
 106                 return ret;
 107         }
 108
 109         if (status) {
 110                 IWL_ERR(mvm, "Binding command failed: %u\n", status);
 111                 ret = -EIO;
 112         }
 113
 114         return ret;
 115 }
 116
 117 static void iwl_mvm_iface_iterator(void *_data, u8 *mac,
 118                                    struct ieee80211_vif *vif)
 119 {
 120         struct iwl_mvm_iface_iterator_data *data = _data;
 121         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 122
 123         if (vif == data->ignore_vif)
 124                 return;
 125
 126         if (mvmvif->phy_ctxt != data->phyctxt)
 127                 return;
 128
 129         if (WARN_ON_ONCE(data->idx >= MAX_MACS_IN_BINDING))
 130                 return;
 131
 132         data->ids[data->idx] = mvmvif->id;
 133         data->colors[data->idx] = mvmvif->color;
 134         data->idx++;
 135 }
 136
 137 static int iwl_mvm_binding_update(struct iwl_mvm *mvm,
 138                                   struct ieee80211_vif *vif,
 139                                   struct iwl_mvm_phy_ctxt *phyctxt,
 140                                   bool add)
 141 {
 142         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 143         struct iwl_mvm_iface_iterator_data data = {
 144                 .ignore_vif = vif,
 145                 .phyctxt = phyctxt,
 146         };
 147         u32 action = FW_CTXT_ACTION_MODIFY;
 148
 149         lockdep_assert_held(&mvm->mutex);
 150
 151         ieee80211_iterate_active_interfaces_atomic(mvm->hw,
 152                                                    IEEE80211_IFACE_ITER_NORMAL,
 153                                                    iwl_mvm_iface_iterator,
 154                                                    &data);
 155
 156         /*
 157          * If there are no other interfaces yet we
 158          * need to create a new binding.
 159          */
 160         if (data.idx == 0) {
 161                 if (add)
 162                         action = FW_CTXT_ACTION_ADD;
 163                 else
 164                         action = FW_CTXT_ACTION_REMOVE;
 165         }
 166
 167         if (add) {
 168                 if (WARN_ON_ONCE(data.idx >= MAX_MACS_IN_BINDING))
 169                         return -EINVAL;
 170
 171                 data.ids[data.idx] = mvmvif->id;
 172                 data.colors[data.idx] = mvmvif->color;
 173                 data.idx++;
 174         }
 175
 176         return iwl_mvm_binding_cmd(mvm, action, &data);
 177 }
 178
 179 int iwl_mvm_binding_add_vif(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 180 {
 181         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 182
 183         if (WARN_ON_ONCE(!mvmvif->phy_ctxt))
 184                 return -EINVAL;
 185
 186         /*
 187          * Update SF - Disable if needed. if this fails, SF might still be on
 188          * while many macs are bound, which is forbidden - so fail the binding.
 189          */
 190         if (iwl_mvm_sf_update(mvm, vif, false))
 191                 return -EINVAL;
 192
 193         return iwl_mvm_binding_update(mvm, vif, mvmvif->phy_ctxt, true);
 194 }
 195
 196 int iwl_mvm_binding_remove_vif(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 197 {
 198         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 199         int ret;
 200
 201         if (WARN_ON_ONCE(!mvmvif->phy_ctxt))
 202                 return -EINVAL;
 203
 204         ret = iwl_mvm_binding_update(mvm, vif, mvmvif->phy_ctxt, false);
 205
 206         if (!ret)
 207                 if (iwl_mvm_sf_update(mvm, vif, true))
 208                         IWL_ERR(mvm, "Failed to update SF state\n");
 209
 210         return ret;
 211 }