quota.c

/******************************************************************************
 *
 * 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 - 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.
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 * General Public License for more details.
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 * 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 - 2013 Intel Corporation. All rights reserved.
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 *****************************************************************************/

#include <net/mac80211.h>
#include "fw-api.h"
#include "mvm.h"

struct iwl_mvm_quota_iterator_data {
	int n_interfaces[MAX_BINDINGS];
	int colors[MAX_BINDINGS];
	struct ieee80211_vif *new_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;

	/*
	 * We'll account for the new interface (if any) below,
	 * skip it here in case we're not called from within
	 * the add_interface callback (otherwise it won't show
	 * up in iteration)
	 */
	if (vif == data->new_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;

	if (data->colors[id] < 0)
		data->colors[id] = mvmvif->phy_ctxt->color;
	else
		WARN_ON_ONCE(data->colors[id] != mvmvif->phy_ctxt->color);

	switch (vif->type) {
	case NL80211_IFTYPE_STATION:
		if (vif->bss_conf.assoc)
			data->n_interfaces[id]++;
		break;
	case NL80211_IFTYPE_AP:
		if (mvmvif->ap_active)
			data->n_interfaces[id]++;
		break;
	case NL80211_IFTYPE_MONITOR:
		if (mvmvif->monitor_active)
			data->n_interfaces[id]++;
		break;
	case NL80211_IFTYPE_P2P_DEVICE:
		break;
	case NL80211_IFTYPE_ADHOC:
		if (vif->bss_conf.ibss_joined)
			data->n_interfaces[id]++;
		break;
	default:
		WARN_ON_ONCE(1);
		break;
	}
}

int iwl_mvm_update_quotas(struct iwl_mvm *mvm, struct ieee80211_vif *newvif)
{
	struct iwl_time_quota_cmd cmd = {};
	int i, idx, ret, num_active_macs, quota, quota_rem;
	struct iwl_mvm_quota_iterator_data data = {
		.n_interfaces = {},
		.colors = { -1, -1, -1, -1 },
		.new_vif = newvif,
	};

	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);
	if (newvif) {
		data.new_vif = NULL;
		iwl_mvm_quota_iterator(&data, newvif->addr, newvif);
	}

	/*
	 * 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];
	}

	quota = 0;
	quota_rem = 0;
	if (num_active_macs) {
		quota = IWL_MVM_MAX_QUOTA / num_active_macs;
		quota_rem = IWL_MVM_MAX_QUOTA % num_active_macs;
	}

	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);
			cmd.quotas[idx].max_duration = cpu_to_le32(0);
		} else {
			cmd.quotas[idx].quota =
				cpu_to_le32(quota * data.n_interfaces[i]);
			cmd.quotas[idx].max_duration =
				cpu_to_le32(IWL_MVM_MAX_QUOTA);
		}
		idx++;
	}

	/* Give the remainder of the session to the first binding */
	le32_add_cpu(&cmd.quotas[0].quota, quota_rem);

	ret = iwl_mvm_send_cmd_pdu(mvm, TIME_QUOTA_CMD, CMD_SYNC,
				   sizeof(cmd), &cmd);
	if (ret)
		IWL_ERR(mvm, "Failed to send quota: %d\n", ret);
	return ret;
}