1 files changed, 328 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/quota.c b/drivers/net/wireless/intel/iwlwifi/mvm/quota.c
new file mode 100644
index 000000000000..509a66d05245
--- /dev/null
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/quota.c
@@ -0,0 +1,328 @@
+/******************************************************************************
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
+ * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
+ *
+ * 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 COPYING.
+ *
+ * Contact Information:
+ *  Intel Linux Wireless <ilw@linux.intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
+ * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  * Neither the name Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+
+#include <net/mac80211.h>
+#include "fw-api.h"
+#include "mvm.h"
+
+#define QUOTA_100       IWL_MVM_MAX_QUOTA
+#define QUOTA_LOWLAT_MIN ((QUOTA_100 * IWL_MVM_LOWLAT_QUOTA_MIN_PERCENT) / 100)
+
+struct iwl_mvm_quota_iterator_data {
+        int n_interfaces[MAX_BINDINGS];
+        int colors[MAX_BINDINGS];
+        int low_latency[MAX_BINDINGS];
+        int n_low_latency_bindings;
+        struct ieee80211_vif *disabled_vif;
+};
+
+static void iwl_mvm_quota_iterator(void *_data, u8 *mac,
+                                   struct ieee80211_vif *vif)
+{
+        struct iwl_mvm_quota_iterator_data *data = _data;
+        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+        u16 id;
+
+        /* skip disabled interfaces here immediately */
+        if (vif == data->disabled_vif)
+                return;
+
+        if (!mvmvif->phy_ctxt)
+                return;
+
+        /* currently, PHY ID == binding ID */
+        id = mvmvif->phy_ctxt->id;
+
+        /* need at least one binding per PHY */
+        BUILD_BUG_ON(NUM_PHY_CTX > MAX_BINDINGS);
+
+        if (WARN_ON_ONCE(id >= MAX_BINDINGS))
+                return;
+
+        switch (vif->type) {
+        case NL80211_IFTYPE_STATION:
+                if (vif->bss_conf.assoc)
+                        break;
+                return;
+        case NL80211_IFTYPE_AP:
+        case NL80211_IFTYPE_ADHOC:
+                if (mvmvif->ap_ibss_active)
+                        break;
+                return;
+        case NL80211_IFTYPE_MONITOR:
+                if (mvmvif->monitor_active)
+                        break;
+                return;
+        case NL80211_IFTYPE_P2P_DEVICE:
+                return;
+        default:
+                WARN_ON_ONCE(1);
+                return;
+        }
+
+        if (data->colors[id] < 0)
+                data->colors[id] = mvmvif->phy_ctxt->color;
+        else
+                WARN_ON_ONCE(data->colors[id] != mvmvif->phy_ctxt->color);
+
+        data->n_interfaces[id]++;
+
+        if (iwl_mvm_vif_low_latency(mvmvif) && !data->low_latency[id]) {
+                data->n_low_latency_bindings++;
+                data->low_latency[id] = true;
+        }
+}
+
+static void iwl_mvm_adjust_quota_for_noa(struct iwl_mvm *mvm,
+                                         struct iwl_time_quota_cmd *cmd)
+{
+#ifdef CONFIG_NL80211_TESTMODE
+        struct iwl_mvm_vif *mvmvif;
+        int i, phy_id = -1, beacon_int = 0;
+
+        if (!mvm->noa_duration || !mvm->noa_vif)
+                return;
+
+        mvmvif = iwl_mvm_vif_from_mac80211(mvm->noa_vif);
+        if (!mvmvif->ap_ibss_active)
+                return;
+
+        phy_id = mvmvif->phy_ctxt->id;
+        beacon_int = mvm->noa_vif->bss_conf.beacon_int;
+
+        for (i = 0; i < MAX_BINDINGS; i++) {
+                u32 id_n_c = le32_to_cpu(cmd->quotas[i].id_and_color);
+                u32 id = (id_n_c & FW_CTXT_ID_MSK) >> FW_CTXT_ID_POS;
+                u32 quota = le32_to_cpu(cmd->quotas[i].quota);
+
+                if (id != phy_id)
+                        continue;
+
+                quota *= (beacon_int - mvm->noa_duration);
+                quota /= beacon_int;
+
+                IWL_DEBUG_QUOTA(mvm, "quota: adjust for NoA from %d to %d\n",
+                                le32_to_cpu(cmd->quotas[i].quota), quota);
+
+                cmd->quotas[i].quota = cpu_to_le32(quota);
+        }
+#endif
+}
+
+int iwl_mvm_update_quotas(struct iwl_mvm *mvm,
+                          bool force_update,
+                          struct ieee80211_vif *disabled_vif)
+{
+        struct iwl_time_quota_cmd cmd = {};
+        int i, idx, err, num_active_macs, quota, quota_rem, n_non_lowlat;
+        struct iwl_mvm_quota_iterator_data data = {
+                .n_interfaces = {},
+                .colors = { -1, -1, -1, -1 },
+                .disabled_vif = disabled_vif,
+        };
+        struct iwl_time_quota_cmd *last = &mvm->last_quota_cmd;
+        bool send = false;
+
+        lockdep_assert_held(&mvm->mutex);
+
+        /* update all upon completion */
+        if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
+                return 0;
+
+        /* iterator data above must match */
+        BUILD_BUG_ON(MAX_BINDINGS != 4);
+
+        ieee80211_iterate_active_interfaces_atomic(
+                mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
+                iwl_mvm_quota_iterator, &data);
+
+        /*
+         * The FW's scheduling session consists of
+         * IWL_MVM_MAX_QUOTA fragments. Divide these fragments
+         * equally between all the bindings that require quota
+         */
+        num_active_macs = 0;
+        for (i = 0; i < MAX_BINDINGS; i++) {
+                cmd.quotas[i].id_and_color = cpu_to_le32(FW_CTXT_INVALID);
+                num_active_macs += data.n_interfaces[i];
+        }
+
+        n_non_lowlat = num_active_macs;
+
+        if (data.n_low_latency_bindings == 1) {
+                for (i = 0; i < MAX_BINDINGS; i++) {
+                        if (data.low_latency[i]) {
+                                n_non_lowlat -= data.n_interfaces[i];
+                                break;
+                        }
+                }
+        }
+
+        if (data.n_low_latency_bindings == 1 && n_non_lowlat) {
+                /*
+                 * Reserve quota for the low latency binding in case that
+                 * there are several data bindings but only a single
+                 * low latency one. Split the rest of the quota equally
+                 * between the other data interfaces.
+                 */
+                quota = (QUOTA_100 - QUOTA_LOWLAT_MIN) / n_non_lowlat;
+                quota_rem = QUOTA_100 - n_non_lowlat * quota -
+                            QUOTA_LOWLAT_MIN;
+                IWL_DEBUG_QUOTA(mvm,
+                                "quota: low-latency binding active, remaining quota per other binding: %d\n",
+                                quota);
+        } else if (num_active_macs) {
+                /*
+                 * There are 0 or more than 1 low latency bindings, or all the
+                 * data interfaces belong to the single low latency binding.
+                 * Split the quota equally between the data interfaces.
+                 */
+                quota = QUOTA_100 / num_active_macs;
+                quota_rem = QUOTA_100 % num_active_macs;
+                IWL_DEBUG_QUOTA(mvm,
+                                "quota: splitting evenly per binding: %d\n",
+                                quota);
+        } else {
+                /* values don't really matter - won't be used */
+                quota = 0;
+                quota_rem = 0;
+        }
+
+        for (idx = 0, i = 0; i < MAX_BINDINGS; i++) {
+                if (data.colors[i] < 0)
+                        continue;
+
+                cmd.quotas[idx].id_and_color =
+                        cpu_to_le32(FW_CMD_ID_AND_COLOR(i, data.colors[i]));
+
+                if (data.n_interfaces[i] <= 0)
+                        cmd.quotas[idx].quota = cpu_to_le32(0);
+                else if (data.n_low_latency_bindings == 1 && n_non_lowlat &&
+                         data.low_latency[i])
+                        /*
+                         * There is more than one binding, but only one of the
+                         * bindings is in low latency. For this case, allocate
+                         * the minimal required quota for the low latency
+                         * binding.
+                         */
+                        cmd.quotas[idx].quota = cpu_to_le32(QUOTA_LOWLAT_MIN);
+                else
+                        cmd.quotas[idx].quota =
+                                cpu_to_le32(quota * data.n_interfaces[i]);
+
+                WARN_ONCE(le32_to_cpu(cmd.quotas[idx].quota) > QUOTA_100,
+                          "Binding=%d, quota=%u > max=%u\n",
+                          idx, le32_to_cpu(cmd.quotas[idx].quota), QUOTA_100);
+
+                cmd.quotas[idx].max_duration = cpu_to_le32(0);
+
+                idx++;
+        }
+
+        /* Give the remainder of the session to the first data binding */
+        for (i = 0; i < MAX_BINDINGS; i++) {
+                if (le32_to_cpu(cmd.quotas[i].quota) != 0) {
+                        le32_add_cpu(&cmd.quotas[i].quota, quota_rem);
+                        IWL_DEBUG_QUOTA(mvm,
+                                        "quota: giving remainder of %d to binding %d\n",
+                                        quota_rem, i);
+                        break;
+                }
+        }
+
+        iwl_mvm_adjust_quota_for_noa(mvm, &cmd);
+
+        /* check that we have non-zero quota for all valid bindings */
+        for (i = 0; i < MAX_BINDINGS; i++) {
+                if (cmd.quotas[i].id_and_color != last->quotas[i].id_and_color)
+                        send = true;
+                if (cmd.quotas[i].max_duration != last->quotas[i].max_duration)
+                        send = true;
+                if (abs((int)le32_to_cpu(cmd.quotas[i].quota) -
+                        (int)le32_to_cpu(last->quotas[i].quota))
+                                                > IWL_MVM_QUOTA_THRESHOLD)
+                        send = true;
+                if (cmd.quotas[i].id_and_color == cpu_to_le32(FW_CTXT_INVALID))
+                        continue;
+                WARN_ONCE(cmd.quotas[i].quota == 0,
+                          "zero quota on binding %d\n", i);
+        }
+
+        if (!send && !force_update) {
+                /* don't send a practically unchanged command, the firmware has
+                 * to re-initialize a lot of state and that can have an adverse
+                 * impact on it
+                 */
+                return 0;
+        }
+
+        err = iwl_mvm_send_cmd_pdu(mvm, TIME_QUOTA_CMD, 0, sizeof(cmd), &cmd);
+
+        if (err)
+                IWL_ERR(mvm, "Failed to send quota: %d\n", err);
+        else
+                mvm->last_quota_cmd = cmd;
+        return err;
+}