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[client/idd] input: add transport diagnostics

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This commit is contained in:
Geoffrey McRae
2026-08-09 01:55:45 +10:00
parent 5b90384123
commit 487920ada3
9 changed files with 634 additions and 34 deletions
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246
client/transports/LGMP/input.c
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@@ -30,6 +30,7 @@
#include "common/thread.h"
#include "common/time.h"
#include <inttypes.h>
#include <limits.h>
#include <stdatomic.h>
#include <stdint.h>
@@ -44,6 +45,7 @@
#define INPUT_RELEASE_TIMEOUT_US 50000
#define INPUT_WORKER_IDLE_MS 10
#define INPUT_WORKER_RETRY_MS 1
#define INPUT_STATS_INTERVAL_US 5000000
#define INPUT_MAX_SPLIT_REPORTS 4
#define INPUT_MOUSE_DELTA_MIN (INT16_MIN * INPUT_MAX_SPLIT_REPORTS)
#define INPUT_MOUSE_DELTA_MAX (INT16_MAX * INPUT_MAX_SPLIT_REPORTS)
@@ -61,6 +63,42 @@ struct LGMPInputPending
bool pureMotion;
};
struct LGMPInputCounters
{
uint64_t immediateSends;
uint64_t deferredSends;
uint64_t localEnqueues;
uint64_t initialBusy;
uint64_t initialFull;
uint64_t retryBusy;
uint64_t retryFull;
uint64_t relativeCoalesces;
uint64_t absoluteCoalesces;
uint64_t reservedRejects;
uint64_t motionEvictions;
uint64_t discreteOverflowFailures;
uint64_t discreteOverflowResets;
uint64_t claims;
uint64_t releases;
uint64_t keepalives;
uint64_t terminalFailures;
uint64_t ackTotal;
uint64_t ackMax;
uint64_t ackSamples;
unsigned pendingHighWater;
};
struct LGMPInputStats
{
struct LGMPInputCounters counters;
uint64_t lastReport;
uint64_t nextProbe;
uint64_t probeStart;
uint32_t probeSerial;
bool probeOutstanding;
bool probeDue;
};
struct LGMPInput
{
PLGMPClient client;
@@ -104,6 +142,8 @@ struct LGMPInput
LG_InputStatusFn statusCallback;
void * statusOpaque;
struct LGMPInputStats stats;
};
static void buildKeyboardPayload(const LGMPInput * input,
@@ -162,10 +202,16 @@ static void published(LGMPInput * input,
{
case KVMFR_INPUT_MESSAGE_CLAIM:
input->publishedClaimed = true;
++input->stats.counters.claims;
break;
case KVMFR_INPUT_MESSAGE_RELEASE:
input->publishedClaimed = false;
++input->stats.counters.releases;
break;
case KVMFR_INPUT_MESSAGE_KEEPALIVE:
++input->stats.counters.keepalives;
break;
}
}
@@ -173,27 +219,76 @@ static void published(LGMPInput * input,
static void connectionFailed(LGMPInput * input, LGMP_STATUS status)
{
if (input->connected)
{
DEBUG_WARN("LGMP input transport failed: %s", lgmpStatusString(status));
++input->stats.counters.terminalFailures;
}
if (input->available || input->endpointGeneration)
input->notifyStatus = true;
input->connected = false;
input->claimed = false;
input->available = false;
input->ownerBlocked = false;
input->pendingHead = 0;
input->pendingCount = 0;
input->mouseMode = LGMP_INPUT_MOUSE_NONE;
input->mouseButtons = 0;
input->publishedClaimed = false;
input->lastInput = 0;
input->capabilities = 0;
input->statusValid = false;
input->ownerConfirmed = false;
input->connected = false;
input->claimed = false;
input->available = false;
input->ownerBlocked = false;
input->pendingHead = 0;
input->pendingCount = 0;
input->mouseMode = LGMP_INPUT_MOUSE_NONE;
input->mouseButtons = 0;
input->publishedClaimed = false;
input->lastInput = 0;
input->capabilities = 0;
input->statusValid = false;
input->ownerConfirmed = false;
input->stats.probeOutstanding = false;
memset(input->keyState, 0, sizeof(input->keyState));
atomic_store_explicit(&input->stop, true, memory_order_release);
}
static LGMP_STATUS trySend(LGMPInput * input,
const KVMFRInputMessage * message, bool deferred)
{
const bool probe = input->stats.probeDue &&
!input->stats.probeOutstanding;
uint32_t serial;
const LGMP_STATUS status = lgmpClientTrySendData(input->queue,
message, sizeof(*message), probe ? &serial : NULL);
if (status == LGMP_OK)
{
if (deferred)
++input->stats.counters.deferredSends;
else
++input->stats.counters.immediateSends;
if (probe)
{
const uint64_t now = microtime();
input->stats.probeOutstanding = true;
input->stats.probeDue = false;
input->stats.probeSerial = serial;
input->stats.probeStart = now;
input->stats.nextProbe = now + INPUT_STATS_INTERVAL_US;
}
return status;
}
if (status == LGMP_ERR_QUEUE_BUSY)
{
if (deferred)
++input->stats.counters.retryBusy;
else
++input->stats.counters.initialBusy;
}
else if (status == LGMP_ERR_QUEUE_FULL)
{
if (deferred)
++input->stats.counters.retryFull;
else
++input->stats.counters.initialFull;
}
return status;
}
static bool coalesceMotion(LGMPInput * input,
KVMFRInputMessageType type, const KVMFRInputPayload * payload)
{
@@ -209,6 +304,7 @@ static bool coalesceMotion(LGMPInput * input,
if (type == KVMFR_INPUT_MESSAGE_MOUSE_ABSOLUTE)
{
tail->message.payload = *payload;
++input->stats.counters.absoluteCoalesces;
return true;
}
@@ -229,6 +325,7 @@ static bool coalesceMotion(LGMPInput * input,
tail->message.payload.mouseRelative.deltaX = (int32_t)x;
tail->message.payload.mouseRelative.deltaY = (int32_t)y;
++input->stats.counters.relativeCoalesces;
return true;
}
@@ -257,6 +354,7 @@ static bool discardPendingMotion(LGMPInput * input)
if (generation == input->generation)
input->sequence = input->sequence == 1 ?
UINT32_MAX : input->sequence - 1;
++input->stats.counters.motionEvictions;
return true;
}
return false;
@@ -280,10 +378,16 @@ static bool queuePayload(LGMPInput * input, KVMFRInputMessageType type,
}
if (pureMotion && input->pendingCount >=
INPUT_PENDING_LENGTH - INPUT_PENDING_RESERVED)
{
++input->stats.counters.reservedRejects;
return false;
}
if (!pureMotion && input->pendingCount == INPUT_PENDING_LENGTH &&
!discardPendingMotion(input))
{
++input->stats.counters.discreteOverflowFailures;
return false;
}
const uint32_t previousSequence = input->sequence;
if (++input->sequence == 0)
@@ -299,13 +403,15 @@ static bool queuePayload(LGMPInput * input, KVMFRInputMessageType type,
if (!input->pendingCount)
{
const LGMP_STATUS status = lgmpClientTrySendData(input->queue,
&message, sizeof(message), NULL);
const bool probeOutstanding = input->stats.probeOutstanding;
const LGMP_STATUS status = trySend(input, &message, false);
if (status == LGMP_OK)
{
published(input, &message);
if (inputMessage)
input->lastInput = microtime();
if (!probeOutstanding && input->stats.probeOutstanding)
*wake = true;
return true;
}
@@ -326,6 +432,9 @@ static bool queuePayload(LGMPInput * input, KVMFRInputMessageType type,
struct LGMPInputPending * item = pendingAt(input, input->pendingCount++);
item->message = message;
item->pureMotion = pureMotion;
++input->stats.counters.localEnqueues;
if (input->pendingCount > input->stats.counters.pendingHighWater)
input->stats.counters.pendingHighWater = input->pendingCount;
if (inputMessage)
input->lastInput = microtime();
*wake = true;
@@ -578,8 +687,7 @@ static void flushPending(LGMPInput * input)
while (input->connected && input->pendingCount)
{
struct LGMPInputPending * item = pendingAt(input, 0);
const LGMP_STATUS status = lgmpClientTrySendData(input->queue,
&item->message, sizeof(item->message), NULL);
const LGMP_STATUS status = trySend(input, &item->message, true);
if (status == LGMP_ERR_QUEUE_BUSY || status == LGMP_ERR_QUEUE_FULL)
return;
if (status != LGMP_OK)
@@ -595,6 +703,78 @@ static void flushPending(LGMPInput * input)
}
}
static void pollAckProbe(LGMPInput * input)
{
if (!input->stats.probeOutstanding)
return;
uint32_t processed;
const LGMP_STATUS status =
lgmpClientGetSerial(input->queue, &processed);
if (status != LGMP_OK)
{
input->stats.probeOutstanding = false;
connectionFailed(input, status);
return;
}
if ((int32_t)(processed - input->stats.probeSerial) < 0)
return;
const uint64_t elapsed = microtime() - input->stats.probeStart;
input->stats.probeOutstanding = false;
input->stats.counters.ackTotal += elapsed;
++input->stats.counters.ackSamples;
if (elapsed > input->stats.counters.ackMax)
input->stats.counters.ackMax = elapsed;
}
static bool collectStats(LGMPInput * input, uint64_t now, bool force,
struct LGMPInputCounters * result)
{
if (!force && now - input->stats.lastReport < INPUT_STATS_INTERVAL_US)
return false;
input->stats.lastReport = now;
*result = input->stats.counters;
memset(&input->stats.counters, 0, sizeof(input->stats.counters));
input->stats.counters.pendingHighWater = input->pendingCount;
return result->immediateSends || result->deferredSends ||
result->localEnqueues || result->initialBusy ||
result->initialFull || result->retryBusy || result->retryFull ||
result->relativeCoalesces || result->absoluteCoalesces ||
result->reservedRejects || result->motionEvictions ||
result->discreteOverflowFailures ||
result->discreteOverflowResets || result->claims ||
result->releases || result->keepalives ||
result->terminalFailures || result->ackSamples;
}
static void logStats(const struct LGMPInputCounters * stats)
{
const uint64_t ackAverage = stats->ackSamples ?
stats->ackTotal / stats->ackSamples : 0;
DEBUG_TRACE("LGMP input: sent immediate/deferred %" PRIu64 "/%" PRIu64
", queued %" PRIu64 " (high %u), initial busy/full %" PRIu64
"/%" PRIu64 ", retry busy/full %" PRIu64 "/%" PRIu64
", coalesced relative/absolute %" PRIu64 "/%" PRIu64
", motion rejected/evicted %" PRIu64 "/%" PRIu64
", overflow failures/resets %" PRIu64 "/%" PRIu64
", published claim/release/keepalive %" PRIu64 "/%" PRIu64
"/%" PRIu64 ", terminal failures %" PRIu64
", LGMP ACK average/max %" PRIu64 "/%" PRIu64 " us (%" PRIu64
" samples)", stats->immediateSends, stats->deferredSends,
stats->localEnqueues, stats->pendingHighWater,
stats->initialBusy, stats->initialFull, stats->retryBusy,
stats->retryFull, stats->relativeCoalesces,
stats->absoluteCoalesces, stats->reservedRejects,
stats->motionEvictions, stats->discreteOverflowFailures,
stats->discreteOverflowResets, stats->claims, stats->releases,
stats->keepalives, stats->terminalFailures, ackAverage,
stats->ackMax, stats->ackSamples);
}
static void releaseOnDisconnect(LGMPInput * input)
{
if (!input->queue || !input->publishedGeneration)
@@ -652,13 +832,18 @@ static int inputThread(void * opaque)
LGMPInput * input = opaque;
while (!atomic_load_explicit(&input->stop, memory_order_acquire))
{
struct LGMPInputCounters stats = { 0 };
unsigned timeout = INPUT_WORKER_IDLE_MS;
bool wake = false;
LG_LOCK(input->lock);
processInputStatus(input, &wake);
flushPending(input);
pollAckProbe(input);
const uint64_t now = microtime();
if (!input->stats.probeOutstanding &&
now >= input->stats.nextProbe)
input->stats.probeDue = true;
if (input->connected && input->claimed && !inputStateHeld(input) &&
!input->pendingCount &&
input->publishedGeneration == input->generation &&
@@ -678,8 +863,13 @@ static int inputThread(void * opaque)
if (input->pendingCount)
timeout = INPUT_WORKER_RETRY_MS;
if (input->stats.probeOutstanding)
timeout = INPUT_WORKER_RETRY_MS;
const bool report = collectStats(input, now, false, &stats);
LG_UNLOCK(input->lock);
if (report)
logStats(&stats);
notifyInputStatus(input);
if (wake)
lgSignalEvent(input->event);
@@ -688,6 +878,13 @@ static int inputThread(void * opaque)
break;
lgWaitEvent(input->event, timeout);
}
struct LGMPInputCounters stats = { 0 };
LG_LOCK(input->lock);
const bool report = collectStats(input, microtime(), true, &stats);
LG_UNLOCK(input->lock);
if (report)
logStats(&stats);
notifyInputStatus(input);
return 0;
}
@@ -772,6 +969,9 @@ bool lgmpInput_connect(LGMPInput * input, uint32_t clientID)
input->lastSend = 0;
input->lastInput = 0;
input->generation = 0;
memset(&input->stats, 0, sizeof(input->stats));
input->stats.lastReport = microtime();
input->stats.probeDue = true;
clearInputState(input);
atomic_store_explicit(&input->stop, false, memory_order_release);
LGThread * thread;
@@ -953,10 +1153,17 @@ static bool updateKey(void * opaque, int key, bool pressed)
KVMFRInputPayload payload = { 0 };
buildKeyboardPayload(input, &payload);
const uint64_t overflowFailures =
input->stats.counters.discreteOverflowFailures;
bool result = queuePayload(input, KVMFR_INPUT_MESSAGE_KEYBOARD,
&payload, false, &wake);
if (!result && !pressed && input->connected)
{
if (input->stats.counters.discreteOverflowFailures !=
overflowFailures)
++input->stats.counters.discreteOverflowResets;
result = release(input, &wake);
}
else if (!result && input->connected)
*state = previous;
LG_UNLOCK(input->lock);
@@ -1152,12 +1359,17 @@ static bool updateMouseButton(void * opaque, unsigned int button,
return true;
}
const uint64_t overflowFailures =
input->stats.counters.discreteOverflowFailures;
bool result = input->connected && input->available &&
claim(input, &wake) &&
queueMouse(input, mode, 0, 0, 0, buttons, false, &wake);
bool reset = false;
if (!result && !pressed && input->connected)
{
if (input->stats.counters.discreteOverflowFailures !=
overflowFailures)
++input->stats.counters.discreteOverflowResets;
reset = release(input, &wake);
result = reset;
}