229 lines
7.3 KiB
C++
229 lines
7.3 KiB
C++
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <gtest/gtest.h>
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#include <stdio.h>
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#include <string.h>
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#include "chpp/transport.h"
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#include "transport_test.h"
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namespace {
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// Max size of payload sent to chppRxDataCb (bytes)
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constexpr size_t kMaxChunkSize = 20000;
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constexpr size_t kMaxPacketSize = kMaxChunkSize + CHPP_PREAMBLE_LEN_BYTES +
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sizeof(ChppTransportHeader) +
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sizeof(ChppTransportFooter);
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// Input sizes to test the entire range of sizes with a few tests
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constexpr int kChunkSizes[] = {0, 1, 2, 3, 4, 5, 6,
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7, 8, 10, 16, 20, 30, 40,
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51, 100, 201, 1000, 10001, 20000};
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/**
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* Adds a CHPP preamble to the specified location of buf
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*
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* @param buf The CHPP preamble will be added to buf
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* @param loc Location of buf where the CHPP preamble will be added
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*/
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void chppAddPreamble(uint8_t *buf, size_t loc) {
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for (size_t i = 0; i < CHPP_PREAMBLE_LEN_BYTES; i++) {
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buf[loc + i] = static_cast<uint8_t>(
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CHPP_PREAMBLE_DATA >> (CHPP_PREAMBLE_LEN_BYTES - 1 - i) & 0xff);
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}
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}
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/*
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* Test suite for the CHPP Transport Layer
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*/
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class TransportTests : public testing::TestWithParam<int> {
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protected:
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void SetUp() override {
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chppTransportInit(&context);
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}
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ChppTransportState context = {};
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uint8_t buf[kMaxPacketSize] = {};
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};
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/**
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* A series of zeros shouldn't change state from CHPP_STATE_PREAMBLE
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*/
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TEST_P(TransportTests, ZeroNoPreambleInput) {
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size_t len = static_cast<size_t>(GetParam());
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if (len <= kMaxChunkSize) {
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EXPECT_TRUE(chppRxDataCb(&context, buf, len));
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EXPECT_EQ(context.rxStatus.state, CHPP_STATE_PREAMBLE);
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}
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}
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/**
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* A preamble after a series of zeros input should change state from
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* CHPP_STATE_PREAMBLE to CHPP_STATE_HEADER
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*/
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TEST_P(TransportTests, ZeroThenPreambleInput) {
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size_t len = static_cast<size_t>(GetParam());
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if (len <= kMaxChunkSize) {
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// Add preamble at the end of buf
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chppAddPreamble(buf, MAX(0, len - CHPP_PREAMBLE_LEN_BYTES));
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if (len >= CHPP_PREAMBLE_LEN_BYTES) {
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EXPECT_FALSE(chppRxDataCb(&context, buf, len));
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EXPECT_EQ(context.rxStatus.state, CHPP_STATE_HEADER);
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} else {
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EXPECT_TRUE(chppRxDataCb(&context, buf, len));
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EXPECT_EQ(context.rxStatus.state, CHPP_STATE_PREAMBLE);
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}
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}
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}
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/**
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* Rx Testing with various length payloads of zeros
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*/
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TEST_P(TransportTests, RxPayloadOfZeros) {
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context.rxStatus.state = CHPP_STATE_HEADER;
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size_t len = static_cast<size_t>(GetParam());
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if (len <= kMaxChunkSize) {
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ChppTransportHeader header{};
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header.flags = 0;
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header.errorCode = 0;
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header.ackSeq = 1;
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header.seq = 0;
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header.length = len;
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memcpy(buf, &header, sizeof(header));
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// Send header and check for correct state
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EXPECT_FALSE(chppRxDataCb(&context, buf, sizeof(ChppTransportHeader)));
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if (len > 0) {
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EXPECT_EQ(context.rxStatus.state, CHPP_STATE_PAYLOAD);
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} else {
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EXPECT_EQ(context.rxStatus.state, CHPP_STATE_FOOTER);
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}
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// Correct decoding of packet length
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EXPECT_EQ(context.rxHeader.length, len);
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EXPECT_EQ(context.rxStatus.locInDatagram, 0);
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EXPECT_EQ(context.rxDatagram.length, len);
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// Send payload if any and check for correct state
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if (len > 0) {
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EXPECT_FALSE(
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chppRxDataCb(&context, &buf[sizeof(ChppTransportHeader)], len));
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EXPECT_EQ(context.rxStatus.state, CHPP_STATE_FOOTER);
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}
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// Should have complete packet payload by now
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EXPECT_EQ(context.rxStatus.locInDatagram, len);
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// But no ACK yet
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EXPECT_FALSE(context.txStatus.hasPacketsToSend);
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EXPECT_EQ(context.txStatus.errorCodeToSend, CHPP_ERROR_NONE);
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EXPECT_EQ(context.rxStatus.expectedSeq, header.seq);
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// Send footer and check for correct state
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EXPECT_TRUE(chppRxDataCb(&context, &buf[sizeof(ChppTransportHeader) + len],
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sizeof(ChppTransportFooter)));
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EXPECT_EQ(context.rxStatus.state, CHPP_STATE_PREAMBLE);
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// Should have reset loc and length for next packet / datagram
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EXPECT_EQ(context.rxStatus.locInDatagram, 0);
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EXPECT_EQ(context.rxDatagram.length, 0);
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// If payload packet, expect next packet with incremented sequence #
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// Otherwise, should keep previous sequence #
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uint8_t nextSeq = header.seq + ((len > 0) ? 1 : 0);
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EXPECT_EQ(context.rxStatus.expectedSeq, nextSeq);
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// Check for correct ACK crafting if applicable
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// TODO: This will need updating once signalling goes in
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if (len > 0) {
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EXPECT_TRUE(context.txStatus.hasPacketsToSend);
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EXPECT_EQ(context.txStatus.errorCodeToSend, CHPP_ERROR_NONE);
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EXPECT_EQ(context.txDatagramQueue.pending, 0);
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chppTransportDoWork(&context);
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struct ChppTransportHeader *txHeader =
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(struct ChppTransportHeader *)&context.packetToSend
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.payload[CHPP_PREAMBLE_LEN_BYTES];
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EXPECT_EQ(txHeader->flags, CHPP_TRANSPORT_FLAG_FINISHED_DATAGRAM);
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EXPECT_EQ(txHeader->errorCode, CHPP_ERROR_NONE);
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EXPECT_EQ(txHeader->ackSeq, nextSeq);
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EXPECT_EQ(txHeader->length, 0);
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EXPECT_EQ(context.packetToSend.length,
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CHPP_PREAMBLE_LEN_BYTES + sizeof(struct ChppTransportHeader) +
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sizeof(struct ChppTransportFooter));
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}
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}
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}
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TEST_P(TransportTests, EnqueueDatagrams) {
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size_t len = static_cast<size_t>(GetParam());
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if (len <= CHPP_TX_DATAGRAM_QUEUE_LEN) {
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// Add (len) datagrams of various length to queue
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int fr = 0;
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for (int j = 0; j == CHPP_TX_DATAGRAM_QUEUE_LEN; j++) {
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for (size_t i = 1; i <= len; i++) {
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uint8_t *buf = (uint8_t *)chppMalloc(i + 100);
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EXPECT_TRUE(chppEnqueueTxDatagram(&context, i + 100, buf));
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EXPECT_EQ(context.txDatagramQueue.pending, i);
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EXPECT_EQ(context.txDatagramQueue.front, fr);
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EXPECT_EQ(context.txDatagramQueue
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.datagram[(i - 1 + fr) % CHPP_TX_DATAGRAM_QUEUE_LEN]
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.length,
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i + 100);
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}
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if (context.txDatagramQueue.pending == CHPP_TX_DATAGRAM_QUEUE_LEN) {
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uint8_t *buf = (uint8_t *)chppMalloc(100);
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EXPECT_FALSE(chppEnqueueTxDatagram(&context, 100, buf));
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chppFree(buf);
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}
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for (size_t i = len; i > 0; i--) {
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fr++;
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fr %= CHPP_TX_DATAGRAM_QUEUE_LEN;
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EXPECT_TRUE(chppDequeueTxDatagram(&context));
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EXPECT_EQ(context.txDatagramQueue.front, fr);
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EXPECT_EQ(context.txDatagramQueue.pending, i - 1);
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}
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EXPECT_FALSE(chppDequeueTxDatagram(&context));
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EXPECT_EQ(context.txDatagramQueue.front, fr);
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EXPECT_EQ(context.txDatagramQueue.pending, 0);
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}
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}
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}
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INSTANTIATE_TEST_SUITE_P(TransportTestRange, TransportTests,
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testing::ValuesIn(kChunkSizes));
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} // namespace
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