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authorMichael Chan <mchan@broadcom.com>2006-05-26 17:48:07 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-06-17 21:26:26 -0700
commitdf3e6548186f0baa727cd6d3a492891854bd31f2 (patch)
tree525617b51451b730b0723d57258c6a8bf7f53d09 /drivers/net/tg3.c
parent30b6c28d2aca4669f2e609ad5d77ea2a6cf0dd3a (diff)
[TG3]: Add recovery logic when MMIOs are re-ordered
Add recovery logic when we suspect that the system is re-ordering MMIOs. Re-ordered MMIOs to the send mailbox can cause bogus tx completions and hit BUG_ON() in the tx completion path. tg3 already has logic to handle re-ordered MMIOs by flushing the MMIOs that must be strictly ordered (such as the send mailbox). Determining when to enable the flush is currently a manual process of adding known chipsets to a list. The new code replaces the BUG_ON() in the tx completion path with the call to tg3_tx_recover(). It will set the TG3_FLAG_MBOX_WRITE_REORDER flag and reset the chip later in the workqueue to recover and start flushing MMIOs to the mailbox. A message to report the problem will be printed. We will then decide whether or not to add the host bridge to the list of chipsets that do re-ordering. We may add some additional code later to print the host bridge's ID so that the user can report it more easily. The assumption that re-ordering can only happen on x86 systems is also removed. Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/tg3.c')
-rw-r--r--drivers/net/tg3.c53
1 files changed, 48 insertions, 5 deletions
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index cb0ebf83c84..9e61df60741 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -2967,6 +2967,29 @@ static int tg3_setup_phy(struct tg3 *tp, int force_reset)
return err;
}
+/* This is called whenever we suspect that the system chipset is re-
+ * ordering the sequence of MMIO to the tx send mailbox. The symptom
+ * is bogus tx completions. We try to recover by setting the
+ * TG3_FLAG_MBOX_WRITE_REORDER flag and resetting the chip later
+ * in the workqueue.
+ */
+static void tg3_tx_recover(struct tg3 *tp)
+{
+ BUG_ON((tp->tg3_flags & TG3_FLAG_MBOX_WRITE_REORDER) ||
+ tp->write32_tx_mbox == tg3_write_indirect_mbox);
+
+ printk(KERN_WARNING PFX "%s: The system may be re-ordering memory-"
+ "mapped I/O cycles to the network device, attempting to "
+ "recover. Please report the problem to the driver maintainer "
+ "and include system chipset information.\n", tp->dev->name);
+
+ spin_lock(&tp->lock);
+ spin_lock(&tp->tx_lock);
+ tp->tg3_flags |= TG3_FLAG_TX_RECOVERY_PENDING;
+ spin_unlock(&tp->tx_lock);
+ spin_unlock(&tp->lock);
+}
+
/* Tigon3 never reports partial packet sends. So we do not
* need special logic to handle SKBs that have not had all
* of their frags sent yet, like SunGEM does.
@@ -2979,9 +3002,13 @@ static void tg3_tx(struct tg3 *tp)
while (sw_idx != hw_idx) {
struct tx_ring_info *ri = &tp->tx_buffers[sw_idx];
struct sk_buff *skb = ri->skb;
- int i;
+ int i, tx_bug = 0;
+
+ if (unlikely(skb == NULL)) {
+ tg3_tx_recover(tp);
+ return;
+ }
- BUG_ON(skb == NULL);
pci_unmap_single(tp->pdev,
pci_unmap_addr(ri, mapping),
skb_headlen(skb),
@@ -2992,10 +3019,9 @@ static void tg3_tx(struct tg3 *tp)
sw_idx = NEXT_TX(sw_idx);
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
- BUG_ON(sw_idx == hw_idx);
-
ri = &tp->tx_buffers[sw_idx];
- BUG_ON(ri->skb != NULL);
+ if (unlikely(ri->skb != NULL || sw_idx == hw_idx))
+ tx_bug = 1;
pci_unmap_page(tp->pdev,
pci_unmap_addr(ri, mapping),
@@ -3006,6 +3032,11 @@ static void tg3_tx(struct tg3 *tp)
}
dev_kfree_skb(skb);
+
+ if (unlikely(tx_bug)) {
+ tg3_tx_recover(tp);
+ return;
+ }
}
tp->tx_cons = sw_idx;
@@ -3333,6 +3364,11 @@ static int tg3_poll(struct net_device *netdev, int *budget)
/* run TX completion thread */
if (sblk->idx[0].tx_consumer != tp->tx_cons) {
tg3_tx(tp);
+ if (unlikely(tp->tg3_flags & TG3_FLAG_TX_RECOVERY_PENDING)) {
+ netif_rx_complete(netdev);
+ schedule_work(&tp->reset_task);
+ return 0;
+ }
}
/* run RX thread, within the bounds set by NAPI.
@@ -3581,6 +3617,13 @@ static void tg3_reset_task(void *_data)
restart_timer = tp->tg3_flags2 & TG3_FLG2_RESTART_TIMER;
tp->tg3_flags2 &= ~TG3_FLG2_RESTART_TIMER;
+ if (tp->tg3_flags & TG3_FLAG_TX_RECOVERY_PENDING) {
+ tp->write32_tx_mbox = tg3_write32_tx_mbox;
+ tp->write32_rx_mbox = tg3_write_flush_reg32;
+ tp->tg3_flags |= TG3_FLAG_MBOX_WRITE_REORDER;
+ tp->tg3_flags &= ~TG3_FLAG_TX_RECOVERY_PENDING;
+ }
+
tg3_halt(tp, RESET_KIND_SHUTDOWN, 0);
tg3_init_hw(tp, 1);