mux/bsr: fix issue with corrupted UL-SCH PDU
BSR was triggered although there was not enough space in MAC PDU
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1dea4add2a
commit
0094fbd191
3 changed files with 88 additions and 7 deletions
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@ -188,8 +188,6 @@ uint8_t* mux::pdu_get(srslte::byte_buffer_t* payload, uint32_t pdu_sz)
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}
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pending_crnti_ce = 0;
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print_logical_channel_state("after CCCH scheduling");
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bsr_proc::bsr_t bsr;
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bool regular_bsr = bsr_procedure->need_to_send_bsr_on_ul_grant(pdu_msg.rem_size(), &bsr);
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@ -335,12 +335,10 @@ bool bsr_proc::need_to_send_bsr_on_ul_grant(uint32_t grant_size, bsr_t* bsr)
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}
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total_data--; // Because last SDU has no size header
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/* All triggered BSRs shall be cancelled in case the UL dci can accommodate all pending data available for
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transmission but is not sufficient to additionally accommodate the BSR MAC control element plus its subheader.
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*/
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// Only include BSR if it can fit into the remaining grant
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generate_bsr(bsr, 0);
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bsr_sz = bsr->format==LONG_BSR?3:1;
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if (total_data <= (int)grant_size && total_data + 1 + bsr_sz > grant_size) {
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bsr_sz = bsr->format == LONG_BSR ? 3 : 1;
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if (bsr_sz > grant_size) {
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Debug("Grant is not enough to accommodate the BSR MAC CE\n");
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} else {
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Debug("BSR: Including Regular BSR: grant_size=%d, total_data=%d, bsr_sz=%d\n", grant_size, total_data, bsr_sz);
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@ -873,6 +873,86 @@ int mac_ul_sch_pdu_three_byte_test()
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return SRSLTE_SUCCESS;
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}
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// UL-SCH with Trucated BSR and 6 B Msg3
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int mac_ul_sch_pdu_msg3_test()
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{
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const uint8_t tv[] = {0x3c, 0x00, 0xd0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
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srslte::log_filter mac_log("MAC");
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mac_log.set_level(srslte::LOG_LEVEL_DEBUG);
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mac_log.set_hex_limit(100000);
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srslte::log_filter rlc_log("RLC");
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rlc_log.set_level(srslte::LOG_LEVEL_DEBUG);
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rlc_log.set_hex_limit(100000);
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// dummy layers
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phy_dummy phy;
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rlc_dummy rlc(&rlc_log);
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rrc_dummy rrc;
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// the actual MAC
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mac mac(&mac_log);
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mac.init(&phy, &rlc, &rrc);
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const uint16_t crnti = 0x1001;
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mac.set_ho_rnti(crnti, 0);
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// generate config for LCIDs in different LCGs than CCCH
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std::vector<logical_channel_config_t> lcids;
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logical_channel_config_t config = {};
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// The config of DRB1
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config.lcid = 3;
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config.lcg = 3;
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config.PBR = 8;
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config.BSD = 100; // 100ms
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config.priority = 15;
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lcids.push_back(config);
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// setup LCIDs in MAC
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for (auto& channel : lcids) {
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mac.setup_lcid(channel.lcid, channel.lcg, channel.priority, channel.PBR, channel.BSD);
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}
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// write dummy data
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rlc.write_sdu(0, 6); // UL-CCCH with Msg3
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rlc.write_sdu(3, 100); // DRB data on other LCG
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// generate TTI
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uint32 tti = 0;
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mac.run_tti(tti++);
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usleep(100);
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// create UL action and grant and push MAC PDU
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{
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mac_interface_phy_lte::tb_action_ul_t ul_action = {};
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mac_interface_phy_lte::mac_grant_ul_t mac_grant = {};
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mac_grant.rnti = crnti; // make sure MAC picks it up as valid UL grant
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mac_grant.tb.ndi_present = true;
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mac_grant.tb.ndi = true;
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mac_grant.tb.tbs = 9; // give room for MAC subheader, SDU and one padding byte
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int cc_idx = 0;
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// Send grant to MAC and get action for this TB, then call tb_decoded to unlock MAC
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mac.new_grant_ul(cc_idx, mac_grant, &ul_action);
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// print generated PDU
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mac_log.info_hex(ul_action.tb.payload, mac_grant.tb.tbs, "Generated PDU (%d B)\n", mac_grant.tb.tbs);
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#if HAVE_PCAP
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pcap_handle->write_ul_crnti(ul_action.tb.payload, mac_grant.tb.tbs, 0x1001, true, 1);
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#endif
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TESTASSERT(memcmp(ul_action.tb.payload, tv, sizeof(tv)) == 0);
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}
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// make sure MAC PDU thread picks up before stopping
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sleep(1);
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mac.run_tti(0);
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mac.stop();
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return SRSLTE_SUCCESS;
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}
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int main(int argc, char** argv)
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{
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#if HAVE_PCAP
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@ -930,5 +1010,10 @@ int main(int argc, char** argv)
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return -1;
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}
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if (mac_ul_sch_pdu_msg3_test()) {
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printf("mac_ul_sch_pdu_msg3_test() test failed.\n");
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return -1;
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}
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return 0;
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}
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