port-serial: add serial port command scheduler
Add an interface and implementation for a port scheduler that round- robins between ports the scheduler is attached to, serializing command execution among one or more MMPortSerial instances. Theory of operation: Sources (e.g. MMPort subclasses) register themselves with the scheduler. Each source notifies the scheduler whenever its command queue depth changes, for example when new commands are submitted, when commands are completed, or when commands are canceled. The scheduler will round-robin between all sources with pending commands, sleeping when there are no pending commands from any source. For each source with a pending command the scheduler will emit the 'send-command' signal with that source's ID. The given source should send the next command in its queue to the modem. When that command is finished (either successfully or with an error/timeout) the source must call mm_port_scheduler_notify_command_done() to notify the scheduler that it may advance to the next source with a pending command, if any. If the 'send-command' signal and the notify_command_done() call are not balanced the scheduler may stall. Signed-off-by: Dan Williams <dan@ioncontrol.co>
This commit is contained in:
Dan Williams
@@ -8,6 +8,7 @@ test_units = {
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'error-helpers': libhelpers_dep,
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'kernel-device-helpers': libkerneldevice_dep,
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'modem-helpers': libhelpers_dep,
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'port-scheduler': libport_dep,
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'sms-part-3gpp': libhelpers_dep,
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'sms-part-cdma': libhelpers_dep,
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'sms-list': libsms_dep,
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@@ -0,0 +1,640 @@
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details:
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*
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* Copyright (C) 2025 Dan Williams <dan@ioncontrol.co>
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*/
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#include <glib.h>
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#include <string.h>
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#include <locale.h>
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#include <stdio.h>
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#include "mm-port-scheduler-rr.h"
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#include "mm-log-test.h"
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static GMainLoop *loop;
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/*****************************************************************************/
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typedef struct {
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MMPortScheduler *sched;
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guint sig_id;
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gpointer source_id;
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gint num_pending;
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gboolean immediate;
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guint idle_id;
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gpointer data;
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gpointer data2;
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} TestSourceCtx;
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static void
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test_source_setup (TestSourceCtx *ctx,
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MMPortScheduler *sched,
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GCallback send_cmd_func)
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{
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ctx->sched = g_object_ref (sched);
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mm_port_scheduler_register_source (sched, ctx->source_id, "test");
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ctx->sig_id = g_signal_connect (sched,
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MM_PORT_SCHEDULER_SIGNAL_SEND_COMMAND,
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send_cmd_func,
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ctx);
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mm_port_scheduler_notify_num_pending (ctx->sched, ctx->source_id, ctx->num_pending);
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}
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static void
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test_source_cleanup (TestSourceCtx *ctx)
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{
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g_assert_cmpint (ctx->num_pending, ==, 0);
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g_signal_handler_disconnect (ctx->sched, ctx->sig_id);
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mm_port_scheduler_unregister_source (ctx->sched, ctx->source_id);
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g_object_unref (ctx->sched);
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}
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/*****************************************************************************/
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static gboolean
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test_ss_command_done (TestSourceCtx *ctx)
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{
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ctx->idle_id = 0;
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mm_port_scheduler_notify_command_done (ctx->sched, ctx->source_id, ctx->num_pending);
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if (ctx->num_pending == 0)
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g_main_loop_quit (loop);
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return G_SOURCE_REMOVE;
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}
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static void
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test_ss_send_command (MMPortScheduler *scheduler,
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gpointer source,
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TestSourceCtx *ctx)
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{
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g_assert (scheduler == ctx->sched);
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g_assert (source == ctx->source_id);
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ctx->num_pending--;
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g_assert_cmpint (ctx->num_pending, >=, 0);
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if (ctx->immediate) {
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mm_port_scheduler_notify_command_done (ctx->sched, ctx->source_id, ctx->num_pending);
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if (ctx->num_pending == 0)
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g_main_loop_quit (loop);
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} else
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ctx->idle_id = g_idle_add ((GSourceFunc)test_ss_command_done, ctx);
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}
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static void
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test_ss_done (gboolean immediate)
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{
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MMPortScheduler *sched;
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TestSourceCtx ctx = {
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.source_id = GUINT_TO_POINTER (0x1),
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.num_pending = 10,
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.immediate = immediate,
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};
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sched = MM_PORT_SCHEDULER (mm_port_scheduler_rr_new ());
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test_source_setup (&ctx, sched, G_CALLBACK (test_ss_send_command));
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g_main_loop_run (loop);
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test_source_cleanup (&ctx);
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g_object_unref (sched);
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}
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/*****************************************************************************/
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static void
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test_ds_send_command (MMPortScheduler *scheduler,
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gpointer source,
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TestSourceCtx *ctx)
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{
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guint *counter = ctx->data;
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g_assert (scheduler == ctx->sched);
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if (source != ctx->source_id)
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return;
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ctx->num_pending--;
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g_assert_cmpuint (ctx->num_pending, >=, 0);
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mm_port_scheduler_notify_command_done (ctx->sched, ctx->source_id, ctx->num_pending);
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/* assert that the scheduler alternates between the two sources */
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g_assert_cmpuint ((*counter) % 2, ==, ctx->idle_id);
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(*counter)--;
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if (*counter == 0)
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g_main_loop_quit (loop);
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}
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static void
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test_ds_ordering (void)
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{
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MMPortScheduler *sched;
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guint counter;
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TestSourceCtx ctx1 = {
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.source_id = GUINT_TO_POINTER (0x1),
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.num_pending = 10,
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.data = &counter,
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.idle_id = 0, /* expected value of (counter % 2) */
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};
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TestSourceCtx ctx2 = {
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.source_id = GUINT_TO_POINTER (0x2),
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.num_pending = 10,
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.data = &counter,
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.idle_id = 1, /* expected value of (counter % 2) */
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};
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counter = ctx1.num_pending + ctx2.num_pending;
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sched = MM_PORT_SCHEDULER (mm_port_scheduler_rr_new ());
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test_source_setup (&ctx1, sched, G_CALLBACK (test_ds_send_command));
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test_source_setup (&ctx2, sched, G_CALLBACK (test_ds_send_command));
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g_main_loop_run (loop);
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test_source_cleanup (&ctx1);
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test_source_cleanup (&ctx2);
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g_object_unref (sched);
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}
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/*****************************************************************************/
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static void
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test_ds_uneven_send_command (MMPortScheduler *scheduler,
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gpointer source,
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TestSourceCtx *ctx)
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{
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guint *counter = ctx->data;
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g_assert (scheduler == ctx->sched);
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if (source != ctx->source_id)
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return;
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ctx->num_pending--;
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/* Test that the scheduler only calls each source for the number of pending
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* commands it has notified the scheduler are in its queue.
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*/
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g_assert_cmpint (ctx->num_pending, >=, 0);
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mm_port_scheduler_notify_command_done (ctx->sched, ctx->source_id, ctx->num_pending);
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(*counter)--;
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if (*counter == 0)
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g_main_loop_quit (loop);
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}
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static void
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test_ds_uneven_num_pending (void)
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{
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MMPortScheduler *sched;
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guint counter;
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TestSourceCtx ctx1 = {
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.source_id = GUINT_TO_POINTER (0x1),
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.num_pending = 10,
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.data = &counter,
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};
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TestSourceCtx ctx2 = {
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.source_id = GUINT_TO_POINTER (0x2),
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.num_pending = 5,
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.data = &counter,
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};
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counter = ctx1.num_pending + ctx2.num_pending;
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sched = MM_PORT_SCHEDULER (mm_port_scheduler_rr_new ());
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test_source_setup (&ctx1, sched, G_CALLBACK (test_ds_uneven_send_command));
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test_source_setup (&ctx2, sched, G_CALLBACK (test_ds_uneven_send_command));
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g_main_loop_run (loop);
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test_source_cleanup (&ctx1);
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test_source_cleanup (&ctx2);
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g_object_unref (sched);
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}
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/*****************************************************************************/
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static gboolean
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ds_later_notify_pending (TestSourceCtx *ctx)
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{
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mm_port_scheduler_notify_num_pending (ctx->sched, ctx->source_id, ctx->num_pending);
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return G_SOURCE_REMOVE;
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}
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static void
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test_ds_later_send_command (MMPortScheduler *scheduler,
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gpointer source,
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TestSourceCtx *ctx)
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{
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guint *counter = ctx->data;
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g_assert (scheduler == ctx->sched);
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if (source != ctx->source_id)
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return;
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ctx->num_pending--;
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g_assert_cmpint (ctx->num_pending, >=, 0);
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mm_port_scheduler_notify_command_done (ctx->sched, ctx->source_id, ctx->num_pending);
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/* After we've reached zero pending commands wait a short time and then
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* add more to make sure the scheduler wakes up and processes the new pending
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* requests */
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if (ctx->num_pending == 0 && ctx->idle_id > 0) {
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ctx->num_pending = ctx->idle_id;
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ctx->idle_id = 0;
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g_timeout_add_seconds (GPOINTER_TO_UINT (ctx->source_id),
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(GSourceFunc)ds_later_notify_pending,
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ctx);
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}
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(*counter)--;
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if (*counter == 0)
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g_main_loop_quit (loop);
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}
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static void
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test_ds_num_pending_later (void)
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{
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MMPortScheduler *sched;
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guint counter;
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TestSourceCtx ctx1 = {
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.source_id = GUINT_TO_POINTER (0x1),
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.num_pending = 5,
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.data = &counter,
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.idle_id = 2, /* num pending to add after original num_pending reaches 0 */
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};
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TestSourceCtx ctx2 = {
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.source_id = GUINT_TO_POINTER (0x2),
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.num_pending = 4,
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.data = &counter,
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.idle_id = 1, /* num pending to add after original num_pending reaches 0 */
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};
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counter = ctx1.num_pending + ctx2.num_pending + ctx1.idle_id + ctx2.idle_id;
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sched = MM_PORT_SCHEDULER (mm_port_scheduler_rr_new ());
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test_source_setup (&ctx1, sched, G_CALLBACK (test_ds_later_send_command));
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test_source_setup (&ctx2, sched, G_CALLBACK (test_ds_later_send_command));
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g_main_loop_run (loop);
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test_source_cleanup (&ctx1);
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test_source_cleanup (&ctx2);
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g_object_unref (sched);
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}
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/*****************************************************************************/
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static gboolean
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quit_loop (void)
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{
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g_main_loop_quit (loop);
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return G_SOURCE_REMOVE;
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}
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static void
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test_ds_bad_notify_send_command (MMPortScheduler *scheduler,
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gpointer source,
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TestSourceCtx *ctx)
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{
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g_assert (scheduler == ctx->sched);
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if (source != ctx->source_id)
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return;
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if (GPOINTER_TO_UINT (source) == 0x2) {
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/* Second source without any pending commands tries to call
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* notify_command_done but this should have no effect; the scheduler
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* should ignore the num_pending given here.
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*/
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mm_port_scheduler_notify_command_done (ctx->sched, ctx->source_id, 15);
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return;
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}
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g_assert_cmpuint (GPOINTER_TO_UINT (source), ==, 0x1);
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ctx->num_pending--;
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g_assert_cmpint (ctx->num_pending, >=, 0);
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mm_port_scheduler_notify_command_done (ctx->sched, ctx->source_id, ctx->num_pending);
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if (ctx->num_pending == 0) {
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/* Schedule a timeout to quit the mainloop to give enough time for
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* the scheduler to mess up (which we don't expect).
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*/
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g_timeout_add_seconds (1, (GSourceFunc)quit_loop, NULL);
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}
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}
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static gboolean
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assert_not_reached (void)
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{
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g_assert_not_reached ();
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return G_SOURCE_REMOVE;
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}
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static void
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test_ds_bad_notify_done (void)
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{
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MMPortScheduler *sched;
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guint timeout_id;
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TestSourceCtx ctx1 = {
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.source_id = GUINT_TO_POINTER (0x1),
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.num_pending = 5,
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};
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TestSourceCtx ctx2 = {
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.source_id = GUINT_TO_POINTER (0x2),
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.num_pending = 0,
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/* This source just hammers notify_done even though it never has any
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* pending commands.
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*/
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};
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timeout_id = g_timeout_add_seconds (3, (GSourceFunc)assert_not_reached, NULL);
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sched = MM_PORT_SCHEDULER (mm_port_scheduler_rr_new ());
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test_source_setup (&ctx1, sched, G_CALLBACK (test_ds_bad_notify_send_command));
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test_source_setup (&ctx2, sched, G_CALLBACK (test_ds_bad_notify_send_command));
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g_main_loop_run (loop);
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g_source_remove (timeout_id);
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test_source_cleanup (&ctx1);
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test_source_cleanup (&ctx2);
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g_object_unref (sched);
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}
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/*****************************************************************************/
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static void
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test_ds_delay_notify_send_command (MMPortScheduler *scheduler,
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gpointer source,
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TestSourceCtx *ctx)
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{
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guint *counter = ctx->data;
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gint64 *last_call = ctx->data2;
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gint64 now;
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g_assert (scheduler == ctx->sched);
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if (source != ctx->source_id)
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return;
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/* Ensure there was at least the inter-port delay time since the last call */
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now = g_get_monotonic_time ();
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g_assert_cmpint (now - *last_call, >=, 500);
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*last_call = now;
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ctx->num_pending--;
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g_assert_cmpuint (ctx->num_pending, >=, 0);
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mm_port_scheduler_notify_command_done (ctx->sched, ctx->source_id, ctx->num_pending);
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(*counter)--;
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if (*counter == 0)
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g_main_loop_quit (loop);
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}
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static void
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test_ds_inter_port_delay (void)
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{
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MMPortScheduler *sched;
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guint counter;
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gint64 last_call = 0;
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TestSourceCtx ctx1 = {
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.source_id = GUINT_TO_POINTER (0x1),
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.data = &counter,
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.data2 = &last_call,
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.num_pending = 5,
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};
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TestSourceCtx ctx2 = {
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.source_id = GUINT_TO_POINTER (0x2),
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.data = &counter,
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.data2 = &last_call,
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.num_pending = 5,
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};
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counter = ctx1.num_pending + ctx2.num_pending;
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sched = MM_PORT_SCHEDULER (mm_port_scheduler_rr_new ());
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g_object_set (sched, MM_PORT_SCHEDULER_RR_INTER_PORT_DELAY, 500, NULL);
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test_source_setup (&ctx1, sched, G_CALLBACK (test_ds_delay_notify_send_command));
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test_source_setup (&ctx2, sched, G_CALLBACK (test_ds_delay_notify_send_command));
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g_main_loop_run (loop);
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test_source_cleanup (&ctx1);
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test_source_cleanup (&ctx2);
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g_object_unref (sched);
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}
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/*****************************************************************************/
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static void
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test_ds_no_delay_notify_send_command (MMPortScheduler *scheduler,
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gpointer source,
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TestSourceCtx *ctx)
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{
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guint *counter = ctx->data;
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gint64 *last_call = ctx->data2;
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gint64 now;
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g_assert (scheduler == ctx->sched);
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if (source != ctx->source_id)
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return;
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/* Since the second source has no pending commands, there should be
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* no delay between calls since only one source is executing.
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*/
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now = g_get_monotonic_time ();
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g_assert_cmpint (now - *last_call, <, 1000);
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*last_call = now;
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ctx->num_pending--;
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g_assert_cmpuint (ctx->num_pending, >=, 0);
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|
||||
mm_port_scheduler_notify_command_done (ctx->sched, ctx->source_id, ctx->num_pending);
|
||||
|
||||
(*counter)--;
|
||||
if (*counter == 0)
|
||||
g_main_loop_quit (loop);
|
||||
}
|
||||
|
||||
static void
|
||||
test_ds_inter_port_no_delay (void)
|
||||
{
|
||||
MMPortScheduler *sched;
|
||||
guint counter;
|
||||
gint64 last_call;
|
||||
|
||||
TestSourceCtx ctx1 = {
|
||||
.source_id = GUINT_TO_POINTER (0x1),
|
||||
.data = &counter,
|
||||
.data2 = &last_call,
|
||||
.num_pending = 5,
|
||||
};
|
||||
|
||||
TestSourceCtx ctx2 = {
|
||||
.source_id = GUINT_TO_POINTER (0x2),
|
||||
.data = &counter,
|
||||
.data2 = &last_call,
|
||||
.num_pending = 0,
|
||||
};
|
||||
|
||||
counter = ctx1.num_pending + ctx2.num_pending;
|
||||
last_call = g_get_monotonic_time ();
|
||||
|
||||
sched = MM_PORT_SCHEDULER (mm_port_scheduler_rr_new ());
|
||||
test_source_setup (&ctx1, sched, G_CALLBACK (test_ds_no_delay_notify_send_command));
|
||||
test_source_setup (&ctx2, sched, G_CALLBACK (test_ds_no_delay_notify_send_command));
|
||||
|
||||
g_main_loop_run (loop);
|
||||
|
||||
test_source_cleanup (&ctx1);
|
||||
test_source_cleanup (&ctx2);
|
||||
g_object_unref (sched);
|
||||
}
|
||||
|
||||
/*****************************************************************************/
|
||||
|
||||
static void
|
||||
test_ds_pending_during_done_notify_send_command (MMPortScheduler *scheduler,
|
||||
gpointer source,
|
||||
TestSourceCtx *ctx)
|
||||
{
|
||||
guint *counter = ctx->data;
|
||||
|
||||
g_assert (scheduler == ctx->sched);
|
||||
if (source != ctx->source_id)
|
||||
return;
|
||||
|
||||
ctx->num_pending--;
|
||||
g_assert_cmpuint (ctx->num_pending, >=, 0);
|
||||
|
||||
/* Simulate command completion adding more pending commands before calling command-done */
|
||||
if (ctx->idle_id > 0) {
|
||||
ctx->idle_id--;
|
||||
ctx->num_pending++; /* increase length of fake source's command queue */
|
||||
mm_port_scheduler_notify_num_pending (ctx->sched, ctx->source_id, ctx->num_pending);
|
||||
}
|
||||
|
||||
mm_port_scheduler_notify_command_done (ctx->sched, ctx->source_id, ctx->num_pending);
|
||||
|
||||
(*counter)--;
|
||||
if (*counter == 0)
|
||||
g_main_loop_quit (loop);
|
||||
}
|
||||
|
||||
static void
|
||||
test_ds_pending_during_done (void)
|
||||
{
|
||||
MMPortScheduler *sched;
|
||||
guint counter;
|
||||
|
||||
TestSourceCtx ctx1 = {
|
||||
.source_id = GUINT_TO_POINTER (0x1),
|
||||
.data = &counter,
|
||||
.idle_id = 5, /* additional to add during notify-command-done */
|
||||
.num_pending = 5,
|
||||
};
|
||||
|
||||
TestSourceCtx ctx2 = {
|
||||
.source_id = GUINT_TO_POINTER (0x2),
|
||||
.data = &counter,
|
||||
.idle_id = 5, /* additional to add during notify-command-done */
|
||||
.num_pending = 5,
|
||||
};
|
||||
|
||||
counter = ctx1.num_pending + ctx2.num_pending + ctx1.idle_id + ctx2.idle_id;
|
||||
|
||||
sched = MM_PORT_SCHEDULER (mm_port_scheduler_rr_new ());
|
||||
test_source_setup (&ctx1, sched, G_CALLBACK (test_ds_pending_during_done_notify_send_command));
|
||||
test_source_setup (&ctx2, sched, G_CALLBACK (test_ds_pending_during_done_notify_send_command));
|
||||
|
||||
g_main_loop_run (loop);
|
||||
|
||||
test_source_cleanup (&ctx1);
|
||||
test_source_cleanup (&ctx2);
|
||||
g_object_unref (sched);
|
||||
}
|
||||
|
||||
/*****************************************************************************/
|
||||
|
||||
static void
|
||||
test_errors_bad_source_done (void)
|
||||
{
|
||||
MMPortScheduler *sched;
|
||||
|
||||
sched = MM_PORT_SCHEDULER (mm_port_scheduler_rr_new ());
|
||||
mm_port_scheduler_notify_command_done (sched, GUINT_TO_POINTER (0x1), 5);
|
||||
g_object_unref (sched);
|
||||
}
|
||||
|
||||
/*****************************************************************************/
|
||||
|
||||
static void
|
||||
test_errors_source_done_before_loop (void)
|
||||
{
|
||||
MMPortScheduler *sched;
|
||||
|
||||
TestSourceCtx ctx = {
|
||||
.source_id = GUINT_TO_POINTER (0x1),
|
||||
};
|
||||
|
||||
sched = MM_PORT_SCHEDULER (mm_port_scheduler_rr_new ());
|
||||
test_source_setup (&ctx, sched, G_CALLBACK (assert_not_reached));
|
||||
mm_port_scheduler_notify_command_done (sched, ctx.source_id, 5);
|
||||
|
||||
test_source_cleanup (&ctx);
|
||||
g_object_unref (sched);
|
||||
}
|
||||
|
||||
/*****************************************************************************/
|
||||
|
||||
int main (int argc, char **argv)
|
||||
{
|
||||
int ret;
|
||||
|
||||
setlocale (LC_ALL, "");
|
||||
|
||||
g_test_init (&argc, &argv, NULL);
|
||||
|
||||
loop = g_main_loop_new (NULL, FALSE);
|
||||
|
||||
g_test_add_data_func ("/MM/port-scheduler/single-source/done-immediate", GUINT_TO_POINTER (TRUE), (GTestDataFunc)test_ss_done);
|
||||
g_test_add_data_func ("/MM/port-scheduler/single-source/done-idle", GUINT_TO_POINTER (FALSE), (GTestDataFunc)test_ss_done);
|
||||
g_test_add_data_func ("/MM/port-scheduler/dual-source/ordering", NULL, (GTestDataFunc)test_ds_ordering);
|
||||
g_test_add_data_func ("/MM/port-scheduler/dual-source/uneven-num-pending", NULL, (GTestDataFunc)test_ds_uneven_num_pending);
|
||||
g_test_add_data_func ("/MM/port-scheduler/dual-source/num-pending-later", NULL, (GTestDataFunc)test_ds_num_pending_later);
|
||||
g_test_add_data_func ("/MM/port-scheduler/dual-source/bad-notify-done", NULL, (GTestDataFunc)test_ds_bad_notify_done);
|
||||
g_test_add_data_func ("/MM/port-scheduler/dual-source/inter-port-delay", NULL, (GTestDataFunc)test_ds_inter_port_delay);
|
||||
g_test_add_data_func ("/MM/port-scheduler/dual-source/inter-port-no-delay", NULL, (GTestDataFunc)test_ds_inter_port_no_delay);
|
||||
g_test_add_data_func ("/MM/port-scheduler/dual-source/pending-during-done", NULL, (GTestDataFunc)test_ds_pending_during_done);
|
||||
g_test_add_data_func ("/MM/port-scheduler/errors/bad-source-done", NULL, (GTestDataFunc)test_errors_bad_source_done);
|
||||
g_test_add_data_func ("/MM/port-scheduler/errors/source-done-before-loop", NULL, (GTestDataFunc)test_errors_source_done_before_loop);
|
||||
|
||||
ret = g_test_run();
|
||||
|
||||
g_main_loop_unref (loop);
|
||||
|
||||
return ret;
|
||||
}
|
||||
Reference in New Issue
Block a user