---

yaml
---
r: 57908
b: refs/heads/master
c: 4c4bd5a
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 83d35145c443d8394aaf1743301e79fa0a8054d7
+refs/heads/master: 4c4bd5a97a87670d2c368ed4ed8a8f2c93080605

trunk/drivers/net/spider_net.c

@@ -1050,6 +1050,66 @@ 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)

trunk/drivers/net/spider_net.h

@@ -25,7 +25,7 @@
 #ifndef _SPIDER_NET_H
 #define _SPIDER_NET_H
 
-#define VERSION "2.0 A"
+#define VERSION "2.0 B"
 
 #include "sungem_phy.h"
 
@@ -461,6 +461,7 @@ struct spider_net_card {
 	struct work_struct tx_timeout_task;
 	atomic_t tx_timeout_task_counter;
 	wait_queue_head_t waitq;
+	int num_rx_ints;
 
 	/* for ethtool */
 	int msg_enable;