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/*
* Queue monitoring.
*
* The feature allows monitoring the DHD queue utilization to get the percentage of a time period
* where the number of pending packets is above a configurable theshold.
* Right now, this is used by a server application, interfacing a Miracast Video Encoder, and
* doing IOVAR "qtime_percent" at regular interval. Based on IOVAR "qtime_percent" results,
* the server indicates to the Video Encoder if its bitrate can be increased or must be decreased.
* Currently, this works only with P2P interfaces and with PROP_TXSTATUS. There is no need to handle
* concurrent access to the fieds because the existing concurrent accesses are protected
* by the PROP_TXSTATUS's lock.
*
* Copyright (C) 2013, Broadcom Corporation
* All Rights Reserved.
*
* This is UNPUBLISHED PROPRIETARY SOURCE CODE of Broadcom Corporation;
* the contents of this file may not be disclosed to third parties, copied
* or duplicated in any form, in whole or in part, without the prior
* written permission of Broadcom Corporation.
*
* $Id: dhd_qmon.c 309265 2012-01-19 02:50:46Z $
*
*/
#include <osl.h>
#include <bcmutils.h>
#include <bcmendian.h>
#include <dngl_stats.h>
#include <wlioctl.h>
#include <dhd.h>
#include <dhd_qmon.h>
#ifndef PROP_TXSTATUS
#error "PROP_TXSTATUS must be build to build dhd_qmon.c"
#endif
#include <wlfc_proto.h>
#include <dhd_wlfc.h>
#if defined(BCMDRIVER)
#define QMON_SYSUPTIME() ((uint64)(jiffies_to_usecs(jiffies)))
#else
#error "target not yet supported"
#endif
static dhd_qmon_t *
dhd_qmon_p2p_entry(dhd_pub_t *dhdp)
{
wlfc_mac_descriptor_t* interfaces = NULL;
wlfc_mac_descriptor_t* nodes = NULL;
uint8 i;
if (dhdp->wlfc_state == NULL)
return NULL;
interfaces = ((athost_wl_status_info_t*)dhdp->wlfc_state)->destination_entries.interfaces;
nodes = ((athost_wl_status_info_t*)dhdp->wlfc_state)->destination_entries.nodes;
ASSERT(interfaces != NULL);
ASSERT(nodes != NULL);
for (i = 0; i < WLFC_MAC_DESC_TABLE_SIZE; i++) {
if (nodes[i].occupied &&
((nodes[i].iftype == WLC_E_IF_ROLE_P2P_CLIENT) ||
(nodes[i].iftype == WLC_E_IF_ROLE_P2P_GO)))
return &nodes[i].qmon;
}
for (i = 0; i < WLFC_MAX_IFNUM; i++) {
if (interfaces[i].occupied &&
((interfaces[i].iftype == WLC_E_IF_ROLE_P2P_CLIENT) ||
(interfaces[i].iftype == WLC_E_IF_ROLE_P2P_GO)))
return &nodes[i].qmon;
}
return NULL;
}
void
dhd_qmon_reset(dhd_qmon_t* qmon)
{
qmon->transitq_count = 0;
qmon->queued_time_cumul = 0;
qmon->queued_time_cumul_last = 0;
qmon->queued_time_last = 0;
qmon->queued_time_last_io = 0;
}
void
dhd_qmon_tx(dhd_qmon_t* qmon)
{
if ((++qmon->transitq_count > qmon->queued_time_thres) &&
(qmon->queued_time_last == 0)) {
/* Set timestamp when transit packet above a threshold */
qmon->queued_time_last = QMON_SYSUPTIME();
}
}
void
dhd_qmon_txcomplete(dhd_qmon_t* qmon)
{
uint64 now = QMON_SYSUPTIME();
qmon->transitq_count--;
if ((qmon->transitq_count <= qmon->queued_time_thres) &&
(qmon->queued_time_last != 0)) {
/* Set timestamp when transit packet above a threshold */
qmon->queued_time_cumul += now - qmon->queued_time_last;
qmon->queued_time_last = 0;
}
}
int
dhd_qmon_thres(dhd_pub_t *dhdp, int set, int setval)
{
int val = 0;
dhd_qmon_t* qmon = dhd_qmon_p2p_entry(dhdp);
if (qmon == NULL)
return 0;
if (set)
qmon->queued_time_thres = setval;
else
val = qmon->queued_time_thres;
return val;
}
int
dhd_qmon_getpercent(dhd_pub_t *dhdp)
{
int percent = 0;
uint64 time_cumul_adjust = 0;
uint64 now = QMON_SYSUPTIME();
dhd_qmon_t* qmon = dhd_qmon_p2p_entry(dhdp);
uint64 queued_time_cumul = 0;
uint64 queued_time_last = 0;
if (qmon == NULL)
return 0;
queued_time_cumul = qmon->queued_time_cumul;
queued_time_last = qmon->queued_time_last;
if (queued_time_last)
time_cumul_adjust = now - queued_time_last;
percent = (uint32)((time_cumul_adjust + queued_time_cumul
- qmon->queued_time_cumul_last) * 100) /
(uint32)(now - qmon->queued_time_last_io);
qmon->queued_time_cumul_last = queued_time_cumul + time_cumul_adjust;
qmon->queued_time_last_io = now;
return percent;
}
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