diff options
| -rw-r--r-- | sys/dev/e1000/if_em.c | 77 | ||||
| -rw-r--r-- | sys/dev/e1000/if_em.h | 22 |
2 files changed, 49 insertions, 50 deletions
diff --git a/sys/dev/e1000/if_em.c b/sys/dev/e1000/if_em.c index ab39c43..736fc77 100644 --- a/sys/dev/e1000/if_em.c +++ b/sys/dev/e1000/if_em.c @@ -1,6 +1,6 @@ /****************************************************************************** - Copyright (c) 2001-2014, Intel Corporation + Copyright (c) 2001-2015, Intel Corporation All rights reserved. Redistribution and use in source and binary forms, with or without @@ -943,11 +943,9 @@ em_mq_start_locked(if_t ifp, struct tx_ring *txr, struct mbuf *m) break; } - if (enq > 0) { - /* Set the watchdog */ - txr->queue_status = EM_QUEUE_WORKING; - txr->watchdog_time = ticks; - } + /* Mark the queue as having work */ + if ((enq > 0) && (txr->busy == EM_TX_IDLE)) + txr->busy = EM_TX_BUSY; if (txr->tx_avail < EM_MAX_SCATTER) em_txeof(txr); @@ -1032,12 +1030,12 @@ em_start_locked(if_t ifp, struct tx_ring *txr) break; } + /* Mark the queue as having work */ + if (txr->busy == EM_TX_IDLE) + txr->busy = EM_TX_BUSY; + /* Send a copy of the frame to the BPF listener */ if_etherbpfmtap(ifp, m_head); - - /* Set timeout in case hardware has problems transmitting. */ - txr->watchdog_time = ticks; - txr->queue_status = EM_QUEUE_WORKING; } return; @@ -2102,8 +2100,6 @@ retry: */ tx_buffer = &txr->tx_buffers[first]; tx_buffer->next_eop = last; - /* Update the watchdog time early and often */ - txr->watchdog_time = ticks; /* * Advance the Transmit Descriptor Tail (TDT), this tells the E1000 @@ -2247,15 +2243,16 @@ em_local_timer(void *arg) ** and the HUNG state will be static if set. */ for (int i = 0; i < adapter->num_queues; i++, txr++) { - if ((txr->queue_status == EM_QUEUE_HUNG) && - (adapter->pause_frames == 0)) + /* Last cycle a queue was declared hung */ + if (txr->busy == EM_TX_HUNG) goto hung; + if (txr->busy >= EM_TX_MAXTRIES) + txr->busy = EM_TX_HUNG; /* Schedule a TX tasklet if needed */ if (txr->tx_avail <= EM_MAX_SCATTER) taskqueue_enqueue(txr->tq, &txr->tx_task); } - adapter->pause_frames = 0; callout_reset(&adapter->timer, hz, em_local_timer, adapter); #ifndef DEVICE_POLLING /* Trigger an RX interrupt to guarantee mbuf refresh */ @@ -2274,7 +2271,6 @@ hung: txr->me, txr->tx_avail, txr->next_to_clean); if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING); adapter->watchdog_events++; - adapter->pause_frames = 0; em_init_locked(adapter); } @@ -2343,9 +2339,9 @@ em_update_link_status(struct adapter *adapter) if (bootverbose) device_printf(dev, "Link is Down\n"); adapter->link_active = 0; - /* Link down, disable watchdog */ + /* Link down, disable hang detection */ for (int i = 0; i < adapter->num_queues; i++, txr++) - txr->queue_status = EM_QUEUE_IDLE; + txr->busy = EM_TX_IDLE; if_link_state_change(ifp, LINK_STATE_DOWN); } } @@ -2376,10 +2372,10 @@ em_stop(void *arg) /* Tell the stack that the interface is no longer active */ if_setdrvflagbits(ifp, IFF_DRV_OACTIVE, IFF_DRV_RUNNING); - /* Unarm watchdog timer. */ + /* Disarm Hang Detection. */ for (int i = 0; i < adapter->num_queues; i++, txr++) { EM_TX_LOCK(txr); - txr->queue_status = EM_QUEUE_IDLE; + txr->busy = EM_TX_IDLE; EM_TX_UNLOCK(txr); } @@ -3358,7 +3354,7 @@ em_setup_transmit_ring(struct tx_ring *txr) /* Set number of descriptors available */ txr->tx_avail = adapter->num_tx_desc; - txr->queue_status = EM_QUEUE_IDLE; + txr->busy = EM_TX_IDLE; /* Clear checksum offload context. */ txr->last_hw_offload = 0; @@ -3419,7 +3415,7 @@ em_initialize_transmit_unit(struct adapter *adapter) E1000_READ_REG(&adapter->hw, E1000_TDBAL(i)), E1000_READ_REG(&adapter->hw, E1000_TDLEN(i))); - txr->queue_status = EM_QUEUE_IDLE; + txr->busy = EM_TX_IDLE; } /* Set the default values for the Tx Inter Packet Gap timer */ @@ -3802,9 +3798,9 @@ em_txeof(struct tx_ring *txr) return; #endif /* DEV_NETMAP */ - /* No work, make sure watchdog is off */ + /* No work, make sure hang detection is disabled */ if (txr->tx_avail == adapter->num_tx_desc) { - txr->queue_status = EM_QUEUE_IDLE; + txr->busy = EM_TX_IDLE; return; } @@ -3847,7 +3843,6 @@ em_txeof(struct tx_ring *txr) tx_buffer->m_head = NULL; } tx_buffer->next_eop = -1; - txr->watchdog_time = ticks; if (++first == adapter->num_tx_desc) first = 0; @@ -3872,14 +3867,16 @@ em_txeof(struct tx_ring *txr) txr->next_to_clean = first; /* - ** Watchdog calculation, we know there's - ** work outstanding or the first return - ** would have been taken, so none processed - ** for too long indicates a hang. local timer - ** will examine this and do a reset if needed. + ** Hang detection: we know there's work outstanding + ** or the entry return would have been taken, so no + ** descriptor processed here indicates a potential hang. + ** The local timer will examine this and do a reset if needed. */ - if ((!processed) && ((ticks - txr->watchdog_time) > EM_WATCHDOG)) - txr->queue_status = EM_QUEUE_HUNG; + if (processed == 0) { + if (txr->busy != EM_TX_HUNG) + ++txr->busy; + } else /* At least one descriptor was cleaned */ + txr->busy = EM_TX_BUSY; /* note this clears HUNG */ /* * If we have a minimum free, clear IFF_DRV_OACTIVE @@ -3891,10 +3888,9 @@ em_txeof(struct tx_ring *txr) if (txr->tx_avail >= EM_MAX_SCATTER) if_setdrvflagbits(ifp, 0, IFF_DRV_OACTIVE); - /* Disable watchdog if all clean */ - if (txr->tx_avail == adapter->num_tx_desc) { - txr->queue_status = EM_QUEUE_IDLE; - } + /* Disable hang detection if all clean */ + if (txr->tx_avail == adapter->num_tx_desc) + txr->busy = EM_TX_IDLE; } @@ -5130,12 +5126,7 @@ em_update_stats_counters(struct adapter *adapter) adapter->stats.rlec += E1000_READ_REG(&adapter->hw, E1000_RLEC); adapter->stats.xonrxc += E1000_READ_REG(&adapter->hw, E1000_XONRXC); adapter->stats.xontxc += E1000_READ_REG(&adapter->hw, E1000_XONTXC); - /* - ** For watchdog management we need to know if we have been - ** paused during the last interval, so capture that here. - */ - adapter->pause_frames = E1000_READ_REG(&adapter->hw, E1000_XOFFRXC); - adapter->stats.xoffrxc += adapter->pause_frames; + adapter->stats.xoffrxc += E1000_READ_REG(&adapter->hw, E1000_XOFFRXC); adapter->stats.xofftxc += E1000_READ_REG(&adapter->hw, E1000_XOFFTXC); adapter->stats.fcruc += E1000_READ_REG(&adapter->hw, E1000_FCRUC); adapter->stats.prc64 += E1000_READ_REG(&adapter->hw, E1000_PRC64); @@ -5762,7 +5753,7 @@ em_print_debug_info(struct adapter *adapter) device_printf(dev, "hw rdh = %d, hw rdt = %d\n", E1000_READ_REG(&adapter->hw, E1000_RDH(0)), E1000_READ_REG(&adapter->hw, E1000_RDT(0))); - device_printf(dev, "Tx Queue Status = %d\n", txr->queue_status); + device_printf(dev, "Tx Queue Status = %d\n", txr->busy); device_printf(dev, "TX descriptors avail = %d\n", txr->tx_avail); device_printf(dev, "Tx Descriptors avail failure = %ld\n", diff --git a/sys/dev/e1000/if_em.h b/sys/dev/e1000/if_em.h index a739815..7695816 100644 --- a/sys/dev/e1000/if_em.h +++ b/sys/dev/e1000/if_em.h @@ -1,6 +1,6 @@ /****************************************************************************** - Copyright (c) 2001-2011, Intel Corporation + Copyright (c) 2001-2015, Intel Corporation All rights reserved. Redistribution and use in source and binary forms, with or without @@ -188,9 +188,19 @@ #define EM_EEPROM_APME 0x400; #define EM_82544_APME 0x0004; -#define EM_QUEUE_IDLE 0 -#define EM_QUEUE_WORKING 1 -#define EM_QUEUE_HUNG 2 +/* + * Driver state logic for the detection of a hung state + * in hardware. Set TX_HUNG whenever a TX packet is used + * (data is sent) and clear it when txeof() is invoked if + * any descriptors from the ring are cleaned/reclaimed. + * Increment internal counter if no descriptors are cleaned + * and compare to TX_MAXTRIES. When counter > TX_MAXTRIES, + * reset adapter. + */ +#define EM_TX_IDLE 0x00000000 +#define EM_TX_BUSY 0x00000001 +#define EM_TX_HUNG 0x80000000 +#define EM_TX_MAXTRIES 10 /* * TDBA/RDBA should be aligned on 16 byte boundary. But TDLEN/RDLEN should be @@ -281,8 +291,7 @@ struct tx_ring { u32 me; u32 msix; u32 ims; - int queue_status; - int watchdog_time; + int busy; struct em_dma_alloc txdma; struct e1000_tx_desc *tx_base; struct task tx_task; @@ -368,7 +377,6 @@ struct adapter { int if_flags; int max_frame_size; int min_frame_size; - int pause_frames; struct mtx core_mtx; int em_insert_vlan_header; u32 ims; |
