diff options
Diffstat (limited to 'drivers/net/spider_net.c')
| -rw-r--r-- | drivers/net/spider_net.c | 86 |
1 files changed, 80 insertions, 6 deletions
diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c index 69005d1..c99980a 100644 --- a/drivers/net/spider_net.c +++ b/drivers/net/spider_net.c @@ -1051,6 +1051,66 @@ static void show_rx_chain(struct spider_net_card *card) #endif /** + * spider_net_resync_head_ptr - Advance head ptr past empty descrs + * + * If the driver fails to keep up and empty the queue, then the + * hardware wil run out of room to put incoming packets. This + * will cause the hardware to skip descrs that are full (instead + * of halting/retrying). Thus, once the driver runs, it wil need + * to "catch up" to where the hardware chain pointer is at. + */ +static void spider_net_resync_head_ptr(struct spider_net_card *card) +{ + unsigned long flags; + struct spider_net_descr_chain *chain = &card->rx_chain; + struct spider_net_descr *descr; + int i, status; + + /* Advance head pointer past any empty descrs */ + descr = chain->head; + status = spider_net_get_descr_status(descr->hwdescr); + + if (status == SPIDER_NET_DESCR_NOT_IN_USE) + return; + + spin_lock_irqsave(&chain->lock, flags); + + descr = chain->head; + status = spider_net_get_descr_status(descr->hwdescr); + for (i=0; i<chain->num_desc; i++) { + if (status != SPIDER_NET_DESCR_CARDOWNED) break; + descr = descr->next; + status = spider_net_get_descr_status(descr->hwdescr); + } + chain->head = descr; + + spin_unlock_irqrestore(&chain->lock, flags); +} + +static int spider_net_resync_tail_ptr(struct spider_net_card *card) +{ + struct spider_net_descr_chain *chain = &card->rx_chain; + struct spider_net_descr *descr; + int i, status; + + /* Advance tail pointer past any empty and reaped descrs */ + descr = chain->tail; + status = spider_net_get_descr_status(descr->hwdescr); + + for (i=0; i<chain->num_desc; i++) { + if ((status != SPIDER_NET_DESCR_CARDOWNED) && + (status != SPIDER_NET_DESCR_NOT_IN_USE)) break; + descr = descr->next; + status = spider_net_get_descr_status(descr->hwdescr); + } + chain->tail = descr; + + if ((i == chain->num_desc) || (i == 0)) + return 1; + return 0; +} + +/** * spider_net_decode_one_descr - processes an RX descriptor * @card: card structure * @@ -1175,6 +1235,12 @@ spider_net_poll(struct net_device *netdev, int *budget) } } + if ((packets_done == 0) && (card->num_rx_ints != 0)) { + no_more_packets = spider_net_resync_tail_ptr(card); + spider_net_resync_head_ptr(card); + } + card->num_rx_ints = 0; + netdev->quota -= packets_done; *budget -= packets_done; spider_net_refill_rx_chain(card); @@ -1421,7 +1487,11 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg) if (netif_msg_intr(card) && net_ratelimit()) pr_err("Spider RX RAM full, incoming packets " "might be discarded!\n"); - spider_net_rx_irq_off(card); + /* Could happen when rx chain is full */ + spider_net_resync_head_ptr(card); + spider_net_refill_rx_chain(card); + spider_net_enable_rxdmac(card); + card->num_rx_ints ++; netif_rx_schedule(card->netdev); show_error = 0; break; @@ -1437,12 +1507,11 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg) case SPIDER_NET_GDCDCEINT: /* fallthrough */ case SPIDER_NET_GDBDCEINT: /* fallthrough */ case SPIDER_NET_GDADCEINT: - if (netif_msg_intr(card) && net_ratelimit()) - pr_err("got descriptor chain end interrupt, " - "restarting DMAC %c.\n", - 'D'-(i-SPIDER_NET_GDDDCEINT)/3); + spider_net_resync_head_ptr(card); spider_net_refill_rx_chain(card); spider_net_enable_rxdmac(card); + card->num_rx_ints ++; + netif_rx_schedule(card->netdev); show_error = 0; break; @@ -1451,9 +1520,12 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg) case SPIDER_NET_GDCINVDINT: /* fallthrough */ case SPIDER_NET_GDBINVDINT: /* fallthrough */ case SPIDER_NET_GDAINVDINT: - /* could happen when rx chain is full */ + /* Could happen when rx chain is full */ + spider_net_resync_head_ptr(card); spider_net_refill_rx_chain(card); spider_net_enable_rxdmac(card); + card->num_rx_ints ++; + netif_rx_schedule(card->netdev); show_error = 0; break; @@ -1546,6 +1618,7 @@ spider_net_interrupt(int irq, void *ptr) if (status_reg & SPIDER_NET_RXINT ) { spider_net_rx_irq_off(card); netif_rx_schedule(netdev); + card->num_rx_ints ++; } if (status_reg & SPIDER_NET_TXINT) netif_rx_schedule(netdev); @@ -2191,6 +2264,7 @@ spider_net_setup_netdev(struct spider_net_card *card) * NETIF_F_HW_VLAN_FILTER */ netdev->irq = card->pdev->irq; + card->num_rx_ints = 0; dn = pci_device_to_OF_node(card->pdev); if (!dn) |
