void gnrc_lwmac_tx_stop(gnrc_netif_t *netif) { assert(netif != NULL); gnrc_lwmac_clear_timeout(netif, GNRC_LWMAC_TIMEOUT_WR); gnrc_lwmac_clear_timeout(netif, GNRC_LWMAC_TIMEOUT_NO_RESPONSE); gnrc_lwmac_clear_timeout(netif, GNRC_LWMAC_TIMEOUT_NEXT_BROADCAST); gnrc_lwmac_clear_timeout(netif, GNRC_LWMAC_TIMEOUT_BROADCAST_END); netif->mac.tx.state = GNRC_LWMAC_TX_STATE_STOPPED; /* Release packet in case of failure */ if (netif->mac.tx.packet) { if (netif->mac.tx.tx_retry_count >= GNRC_LWMAC_MAX_DATA_TX_RETRIES) { netif->mac.tx.tx_retry_count = 0; gnrc_pktbuf_release(netif->mac.tx.packet); netif->mac.tx.packet = NULL; LOG_WARNING("WARNING: [LWMAC-tx] Drop TX packet\n"); } else { netif->mac.tx.tx_retry_count++; return; } } if (!gnrc_lwmac_get_tx_continue(netif)) { netif->mac.tx.current_neighbor = NULL; } }
static void _tx_management_success(gnrc_netif_t *netif) { if (netif->mac.tx.current_neighbor == &(netif->mac.tx.neighbors[0])) { LOG_INFO("[LWMAC] Broadcast transmission done\n"); } gnrc_lwmac_tx_stop(netif); /* In case have pending packets for the same receiver, continue to * send immediately, before the maximum transmit-limit */ if ((gnrc_lwmac_get_tx_continue(netif)) && (netif->mac.tx.tx_burst_count < GNRC_LWMAC_MAX_TX_BURST_PKT_NUM)) { lwmac_schedule_update(netif); } else { lwmac_set_state(netif, GNRC_LWMAC_SLEEPING); } }
/* Returns whether rescheduling is needed or not */ static bool _lwmac_tx_update(gnrc_netif_t *netif) { assert(netif != NULL); bool reschedule = false; switch (netif->mac.tx.state) { case GNRC_LWMAC_TX_STATE_INIT: { gnrc_lwmac_clear_timeout(netif, GNRC_LWMAC_TIMEOUT_WR); gnrc_lwmac_clear_timeout(netif, GNRC_LWMAC_TIMEOUT_NO_RESPONSE); gnrc_lwmac_clear_timeout(netif, GNRC_LWMAC_TIMEOUT_NEXT_BROADCAST); gnrc_lwmac_clear_timeout(netif, GNRC_LWMAC_TIMEOUT_BROADCAST_END); /* if found ongoing transmission, * quit this cycle for collision avoidance. */ if (_gnrc_lwmac_get_netdev_state(netif) == NETOPT_STATE_RX) { if (!gnrc_mac_queue_tx_packet(&netif->mac.tx, 0, netif->mac.tx.packet)) { gnrc_pktbuf_release(netif->mac.tx.packet); LOG_WARNING("WARNING: [LWMAC-tx] TX queue full, drop packet\n"); } /* drop pointer so it wont be free'd */ netif->mac.tx.packet = NULL; netif->mac.tx.state = GNRC_LWMAC_TX_STATE_FAILED; reschedule = true; break; } /* check if the packet is for broadcast */ if (gnrc_netif_hdr_get_flag(netif->mac.tx.packet) & (GNRC_NETIF_HDR_FLAGS_BROADCAST | GNRC_NETIF_HDR_FLAGS_MULTICAST)) { /* Set CSMA retries as configured and enable */ uint8_t csma_retries = GNRC_LWMAC_BROADCAST_CSMA_RETRIES; netif->dev->driver->set(netif->dev, NETOPT_CSMA_RETRIES, &csma_retries, sizeof(csma_retries)); netif->mac.mac_info |= GNRC_NETIF_MAC_INFO_CSMA_ENABLED; netopt_enable_t csma_enable = NETOPT_ENABLE; netif->dev->driver->set(netif->dev, NETOPT_CSMA, &csma_enable, sizeof(csma_enable)); netif->mac.tx.state = GNRC_LWMAC_TX_STATE_SEND_BROADCAST; reschedule = true; break; } else { /* Use CSMA for the first WR */ netif->mac.mac_info |= GNRC_NETIF_MAC_INFO_CSMA_ENABLED; netopt_enable_t csma_disable = NETOPT_ENABLE; netif->dev->driver->set(netif->dev, NETOPT_CSMA, &csma_disable, sizeof(csma_disable)); /* Set a timeout for the maximum transmission procedure */ gnrc_lwmac_set_timeout(netif, GNRC_LWMAC_TIMEOUT_NO_RESPONSE, GNRC_LWMAC_PREAMBLE_DURATION_US); netif->mac.tx.state = GNRC_LWMAC_TX_STATE_SEND_WR; reschedule = true; break; } } case GNRC_LWMAC_TX_STATE_SEND_BROADCAST: { uint8_t tx_info = _send_bcast(netif); if (tx_info & GNRC_LWMAC_TX_SUCCESS) { netif->mac.tx.state = GNRC_LWMAC_TX_STATE_SUCCESSFUL; reschedule = true; break; } if (tx_info & GNRC_LWMAC_TX_FAIL) { netif->mac.tx.state = GNRC_LWMAC_TX_STATE_FAILED; reschedule = true; break; } break; } case GNRC_LWMAC_TX_STATE_SEND_WR: { /* In case of no Tx-isr error (e.g., no Tx-isr), goto TX failure. */ if (gnrc_lwmac_timeout_is_expired(netif, GNRC_LWMAC_TIMEOUT_NO_RESPONSE)) { LOG_WARNING("WARNING: [LWMAC-tx] No response from destination, " "probably no TX-ISR\n"); netif->mac.tx.state = GNRC_LWMAC_TX_STATE_FAILED; reschedule = true; break; } LOG_DEBUG("[LWMAC-tx] GNRC_LWMAC_TX_STATE_SEND_WR\n"); uint8_t tx_info = _send_wr(netif); if (tx_info & GNRC_LWMAC_TX_FAIL) { netif->mac.tx.state = GNRC_LWMAC_TX_STATE_FAILED; reschedule = true; break; } netif->mac.tx.state = GNRC_LWMAC_TX_STATE_WAIT_WR_SENT; reschedule = false; break; } case GNRC_LWMAC_TX_STATE_WAIT_WR_SENT: { LOG_DEBUG("[LWMAC-tx] GNRC_LWMAC_TX_STATE_WAIT_WR_SENT\n"); /* In case of no Tx-isr error (e.g., no Tx-isr), goto TX failure. */ if (gnrc_lwmac_timeout_is_expired(netif, GNRC_LWMAC_TIMEOUT_NO_RESPONSE)) { LOG_WARNING("WARNING: [LWMAC-tx] No response from destination\n"); netif->mac.tx.state = GNRC_LWMAC_TX_STATE_FAILED; reschedule = true; break; } if (gnrc_netif_get_tx_feedback(netif) == TX_FEEDBACK_UNDEF) { LOG_DEBUG("[LWMAC-tx] WR not yet completely sent\n"); break; } /* If found ongoing transmission, goto TX failure, i.e., postpone transmission to * next cycle. This is mainly for collision avoidance. */ if (gnrc_netif_get_tx_feedback(netif) == TX_FEEDBACK_BUSY) { if (!gnrc_mac_queue_tx_packet(&netif->mac.tx, 0, netif->mac.tx.packet)) { gnrc_pktbuf_release(netif->mac.tx.packet); LOG_WARNING("WARNING: [LWMAC-tx] TX queue full, drop packet\n"); } /* clear packet point to avoid TX retry */ netif->mac.tx.packet = NULL; netif->mac.tx.state = GNRC_LWMAC_TX_STATE_FAILED; reschedule = true; break; } if (netif->mac.tx.wr_sent == 0) { /* Only the first WR use CSMA */ netif->mac.mac_info &= ~GNRC_NETIF_MAC_INFO_CSMA_ENABLED; netopt_enable_t csma_disable = NETOPT_DISABLE; netif->dev->driver->set(netif->dev, NETOPT_CSMA, &csma_disable, sizeof(csma_disable)); } netif->mac.tx.wr_sent++; /* Set timeout for next WR in case no WA will be received */ gnrc_lwmac_set_timeout(netif, GNRC_LWMAC_TIMEOUT_WR, GNRC_LWMAC_TIME_BETWEEN_WR_US); /* Debug WR timing */ LOG_DEBUG("[LWMAC-tx] Destination phase was: %" PRIu32 "\n", netif->mac.tx.current_neighbor->phase); LOG_DEBUG("[LWMAC-tx] Phase when sent was: %" PRIu32 "\n", _gnrc_lwmac_ticks_to_phase(netif->mac.tx.timestamp)); LOG_DEBUG("[LWMAC-tx] Ticks when sent was: %" PRIu32 "\n", netif->mac.tx.timestamp); _gnrc_lwmac_set_netdev_state(netif, NETOPT_STATE_IDLE); netif->mac.tx.state = GNRC_LWMAC_TX_STATE_WAIT_FOR_WA; reschedule = false; break; } case GNRC_LWMAC_TX_STATE_WAIT_FOR_WA: { LOG_DEBUG("[LWMAC-tx] GNRC_LWMAC_TX_STATE_WAIT_FOR_WA\n"); if (gnrc_lwmac_timeout_is_expired(netif, GNRC_LWMAC_TIMEOUT_NO_RESPONSE)) { LOG_WARNING("WARNING: [LWMAC-tx] No response from destination\n"); netif->mac.tx.state = GNRC_LWMAC_TX_STATE_FAILED; reschedule = true; break; } if (gnrc_lwmac_timeout_is_expired(netif, GNRC_LWMAC_TIMEOUT_WR)) { /* In case the sender is in consecutive (burst) transmission to the receiver, * meaning that the sender has already successfully sent at least one data to * the receiver, then the sender will only spend one WR for triggering the next * transmission procedure. And, if this WR doesn't work (no WA replied), the * sender regards consecutive transmission failed. */ if (gnrc_lwmac_get_tx_continue(netif)) { LOG_DEBUG("[LWMAC-tx] Tx burst fail\n"); if (!gnrc_mac_queue_tx_packet(&netif->mac.tx, 0, netif->mac.tx.packet)) { gnrc_pktbuf_release(netif->mac.tx.packet); LOG_WARNING("WARNING: [LWMAC-tx] TX queue full, drop packet\n"); } /* drop pointer so it wont be free'd */ netif->mac.tx.packet = NULL; netif->mac.tx.state = GNRC_LWMAC_TX_STATE_FAILED; reschedule = true; break; } else { /* If this is the first transmission to the receiver for locating the * latter's wake-up period, the sender just keep sending WRs until it * finds the WA. */ netif->mac.tx.state = GNRC_LWMAC_TX_STATE_SEND_WR; reschedule = true; break; } } if (_gnrc_lwmac_get_netdev_state(netif) == NETOPT_STATE_RX) { /* Wait for completion of frame reception */ break; } uint8_t tx_info = _packet_process_in_wait_for_wa(netif); if (tx_info & GNRC_LWMAC_TX_FAIL) { netif->mac.tx.state = GNRC_LWMAC_TX_STATE_FAILED; reschedule = true; break; } if (tx_info & GNRC_LWMAC_TX_SUCCESS) { netif->mac.tx.state = GNRC_LWMAC_TX_STATE_SEND_DATA; reschedule = true; break; } else { /* No WA yet */ break; } } case GNRC_LWMAC_TX_STATE_SEND_DATA: { LOG_DEBUG("[LWMAC-tx] GNRC_LWMAC_TX_STATE_SEND_DATA\n"); if (!_send_data(netif)) { netif->mac.tx.state = GNRC_LWMAC_TX_STATE_FAILED; reschedule = true; break; } netif->mac.tx.state = GNRC_LWMAC_TX_STATE_WAIT_FEEDBACK; reschedule = false; break; } case GNRC_LWMAC_TX_STATE_WAIT_FEEDBACK: { /* In case of no Tx-isr error, goto TX failure. */ if (gnrc_lwmac_timeout_is_expired(netif, GNRC_LWMAC_TIMEOUT_NO_RESPONSE)) { netif->mac.tx.state = GNRC_LWMAC_TX_STATE_FAILED; reschedule = true; break; } LOG_DEBUG("[LWMAC-tx] GNRC_LWMAC_TX_STATE_WAIT_FEEDBACK\n"); if (gnrc_netif_get_tx_feedback(netif) == TX_FEEDBACK_UNDEF) { break; } else if (gnrc_netif_get_tx_feedback(netif) == TX_FEEDBACK_SUCCESS) { netif->mac.tx.state = GNRC_LWMAC_TX_STATE_SUCCESSFUL; reschedule = true; break; } else if (gnrc_netif_get_tx_feedback(netif) == TX_FEEDBACK_NOACK) { LOG_ERROR("ERROR: [LWMAC-tx] Not ACKED\n"); netif->mac.tx.state = GNRC_LWMAC_TX_STATE_FAILED; reschedule = true; break; } else if (gnrc_netif_get_tx_feedback(netif) == TX_FEEDBACK_BUSY) { LOG_ERROR("ERROR: [LWMAC-tx] Channel busy \n"); netif->mac.tx.state = GNRC_LWMAC_TX_STATE_FAILED; reschedule = true; break; } LOG_ERROR("ERROR: [LWMAC-tx] Tx feedback unhandled: %i\n", gnrc_netif_get_tx_feedback(netif)); netif->mac.tx.state = GNRC_LWMAC_TX_STATE_FAILED; reschedule = true; break; } case GNRC_LWMAC_TX_STATE_SUCCESSFUL: case GNRC_LWMAC_TX_STATE_FAILED: { break; } case GNRC_LWMAC_TX_STATE_STOPPED: { LOG_DEBUG("[LWMAC-tx] Transmission state machine is stopped\n"); } } return reschedule; }