iwlwifi: mvm: Add Smart FIFO support

Send firmware a Smart FIFO Configuration host command to allow
interrupt coalescing. The smart FIFO is enabled when there is
only one bound interface (other than  p2p devices which are
ignored) and it is of type station, and activated while the
station is associated.

Smart Fifo allows aggragations of DMA transactions and by that
causes processor and memory controller to stay for a longer time
on lower c-states, thus saving platform power.
Firmware relies on driver to activate and disable it.

Signed-off-by: Lilach Edelstein <lilach.edelstein@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

1 files changed, 291 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/mvm/sf.c b/drivers/net/wireless/iwlwifi/mvm/sf.c
new file mode 100644
index 000000000000..97bb3c3e75ce
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/mvm/sf.c
@@ -0,0 +1,291 @@
+/******************************************************************************
+ *
+ * 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) 2013 Intel Corporation. All rights reserved.
+ *
+ * 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) 2013 Intel Corporation. All rights reserved.
+ * 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 "mvm.h"
+
+/* For counting bound interfaces */
+struct iwl_mvm_active_iface_iterator_data {
+        struct ieee80211_vif *ignore_vif;
+        u8 sta_vif_ap_sta_id;
+        enum iwl_sf_state sta_vif_state;
+        int num_active_macs;
+};
+
+/*
+ * Count bound interfaces which are not p2p, besides data->ignore_vif.
+ * data->station_vif will point to one bound vif of type station, if exists.
+ */
+static void iwl_mvm_bound_iface_iterator(void *_data, u8 *mac,
+                                         struct ieee80211_vif *vif)
+{
+        struct iwl_mvm_active_iface_iterator_data *data = _data;
+        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+
+        if (vif == data->ignore_vif || !mvmvif->phy_ctxt ||
+            vif->type == NL80211_IFTYPE_P2P_DEVICE)
+                return;
+
+        data->num_active_macs++;
+
+        if (vif->type == NL80211_IFTYPE_STATION) {
+                data->sta_vif_ap_sta_id = mvmvif->ap_sta_id;
+                if (vif->bss_conf.assoc)
+                        data->sta_vif_state = SF_FULL_ON;
+                else
+                        data->sta_vif_state = SF_INIT_OFF;
+        }
+}
+
+/*
+ * Aging and idle timeouts for the different possible scenarios
+ * in SF_FULL_ON state.
+ */
+static const __le32 sf_full_timeout[SF_NUM_SCENARIO][SF_NUM_TIMEOUT_TYPES] = {
+        {
+                cpu_to_le32(SF_SINGLE_UNICAST_AGING_TIMER),
+                cpu_to_le32(SF_SINGLE_UNICAST_IDLE_TIMER)
+        },
+        {
+                cpu_to_le32(SF_AGG_UNICAST_AGING_TIMER),
+                cpu_to_le32(SF_AGG_UNICAST_IDLE_TIMER)
+        },
+        {
+                cpu_to_le32(SF_MCAST_AGING_TIMER),
+                cpu_to_le32(SF_MCAST_IDLE_TIMER)
+        },
+        {
+                cpu_to_le32(SF_BA_AGING_TIMER),
+                cpu_to_le32(SF_BA_IDLE_TIMER)
+        },
+        {
+                cpu_to_le32(SF_TX_RE_AGING_TIMER),
+                cpu_to_le32(SF_TX_RE_IDLE_TIMER)
+        },
+};
+
+static void iwl_mvm_fill_sf_command(struct iwl_sf_cfg_cmd *sf_cmd,
+                                    struct ieee80211_sta *sta)
+{
+        int i, j, watermark;
+
+        sf_cmd->watermark[SF_LONG_DELAY_ON] = cpu_to_le32(SF_W_MARK_SCAN);
+
+        /*
+         * If we are in association flow - check antenna configuration
+         * capabilities of the AP station, and choose the watermark accordingly.
+         */
+        if (sta) {
+                if (sta->ht_cap.ht_supported || sta->vht_cap.vht_supported) {
+                        switch (sta->rx_nss) {
+                        case 1:
+                                watermark = SF_W_MARK_SISO;
+                                break;
+                        case 2:
+                                watermark = SF_W_MARK_MIMO2;
+                                break;
+                        default:
+                                watermark = SF_W_MARK_MIMO3;
+                                break;
+                        }
+                } else {
+                        watermark = SF_W_MARK_LEGACY;
+                }
+        /* default watermark value for unassociated mode. */
+        } else {
+                watermark = SF_W_MARK_MIMO2;
+        }
+        sf_cmd->watermark[SF_FULL_ON] = cpu_to_le32(watermark);
+
+        for (i = 0; i < SF_NUM_SCENARIO; i++) {
+                for (j = 0; j < SF_NUM_TIMEOUT_TYPES; j++) {
+                        sf_cmd->long_delay_timeouts[i][j] =
+                                        cpu_to_le32(SF_LONG_DELAY_AGING_TIMER);
+                }
+        }
+        BUILD_BUG_ON(sizeof(sf_full_timeout) !=
+                     sizeof(__le32) * SF_NUM_SCENARIO * SF_NUM_TIMEOUT_TYPES);
+
+        memcpy(sf_cmd->full_on_timeouts, sf_full_timeout,
+               sizeof(sf_full_timeout));
+}
+
+static int iwl_mvm_sf_config(struct iwl_mvm *mvm, u8 sta_id,
+                             enum iwl_sf_state new_state)
+{
+        struct iwl_sf_cfg_cmd sf_cmd = {
+                .state = new_state,
+        };
+        struct ieee80211_sta *sta;
+        int ret = 0;
+
+        /*
+         * If an associated AP sta changed its antenna configuration, the state
+         * will remain FULL_ON but SF parameters need to be reconsidered.
+         */
+        if (new_state != SF_FULL_ON && mvm->sf_state == new_state)
+                return 0;
+
+        switch (new_state) {
+        case SF_UNINIT:
+                break;
+        case SF_FULL_ON:
+                if (sta_id == IWL_MVM_STATION_COUNT) {
+                        IWL_ERR(mvm,
+                                "No station: Cannot switch SF to FULL_ON\n");
+                        return -EINVAL;
+                }
+                rcu_read_lock();
+                sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
+                if (IS_ERR_OR_NULL(sta)) {
+                        IWL_ERR(mvm, "Invalid station id\n");
+                        rcu_read_unlock();
+                        return -EINVAL;
+                }
+                iwl_mvm_fill_sf_command(&sf_cmd, sta);
+                rcu_read_unlock();
+                break;
+        case SF_INIT_OFF:
+                iwl_mvm_fill_sf_command(&sf_cmd, NULL);
+                break;
+        default:
+                WARN_ONCE(1, "Invalid state: %d. not sending Smart Fifo cmd\n",
+                          new_state);
+                return -EINVAL;
+        }
+
+        ret = iwl_mvm_send_cmd_pdu(mvm, REPLY_SF_CFG_CMD, CMD_ASYNC,
+                                   sizeof(sf_cmd), &sf_cmd);
+        if (!ret)
+                mvm->sf_state = new_state;
+
+        return ret;
+}
+
+/*
+ * Update Smart fifo:
+ * Count bound interfaces that are not to be removed, ignoring p2p devices,
+ * and set new state accordingly.
+ */
+int iwl_mvm_sf_update(struct iwl_mvm *mvm, struct ieee80211_vif *changed_vif,
+                      bool remove_vif)
+{
+        enum iwl_sf_state new_state;
+        u8 sta_id = IWL_MVM_STATION_COUNT;
+        struct iwl_mvm_vif *mvmvif = NULL;
+        struct iwl_mvm_active_iface_iterator_data data = {
+                .ignore_vif = changed_vif,
+                .sta_vif_state = SF_UNINIT,
+                .sta_vif_ap_sta_id = IWL_MVM_STATION_COUNT,
+        };
+
+        if (IWL_UCODE_API(mvm->fw->ucode_ver) < 8)
+                return 0;
+
+        /*
+         * Ignore the call if we are in HW Restart flow, or if the handled
+         * vif is a p2p device.
+         */
+        if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) ||
+            (changed_vif && changed_vif->type == NL80211_IFTYPE_P2P_DEVICE))
+                return 0;
+
+        ieee80211_iterate_active_interfaces_atomic(mvm->hw,
+                                                   IEEE80211_IFACE_ITER_NORMAL,
+                                                   iwl_mvm_bound_iface_iterator,
+                                                   &data);
+
+        /* If changed_vif exists and is not to be removed, add to the count */
+        if (changed_vif && !remove_vif)
+                data.num_active_macs++;
+
+        switch (data.num_active_macs) {
+        case 0:
+                /* If there are no active macs - change state to SF_INIT_OFF */
+                new_state = SF_INIT_OFF;
+                break;
+        case 1:
+                if (remove_vif) {
+                        /* The one active mac left is of type station
+                         * and we filled the relevant data during iteration
+                         */
+                        new_state = data.sta_vif_state;
+                        sta_id = data.sta_vif_ap_sta_id;
+                } else {
+                        if (WARN_ON(!changed_vif))
+                                return -EINVAL;
+                        if (changed_vif->type != NL80211_IFTYPE_STATION) {
+                                new_state = SF_UNINIT;
+                        } else if (changed_vif->bss_conf.assoc) {
+                                mvmvif = iwl_mvm_vif_from_mac80211(changed_vif);
+                                sta_id = mvmvif->ap_sta_id;
+                                new_state = SF_FULL_ON;
+                        } else {
+                                new_state = SF_INIT_OFF;
+                        }
+                }
+                break;
+        default:
+                /* If there are multiple active macs - change to SF_UNINIT */
+                new_state = SF_UNINIT;
+        }
+        return iwl_mvm_sf_config(mvm, sta_id, new_state);
+}