Hello,
I am using the HW timestamp all RX packets option in the I350 for my
special application.
There is a requirement to keep the HW timestamping clock intact if the link
goes down.
Now, if the link goes down, the IGB watchdog checks the TX ring and of
there are some used descriptors in it, the entire adapter is reset.
I am suggesting to just clean the TX ring in question of this occurs. Do
you have any strong recommendations against this?
for (i = 0; i < adapter->num_tx_queues; i++) {
struct igb_ring *tx_ring = adapter->tx_ring[i];
if (!netif_carrier_ok(netdev)) {
/* We've lost link, so the controller stops DMA,
* but we've got queued Tx work that's never going
* to get done, so reset controller to flush Tx.
* (Do the reset outside of interrupt context). */
if (igb_desc_unused(tx_ring) + 1 < tx_ring->count) {
adapter->tx_timeout_count++;
// schedule_work(&adapter->reset_task);
/* return immediately since reset is imminent */
//return;
printk(KERN_CRIT"%s: used TX descriptors when link down: %d. Cleaning TX
ring\n",
netdev->name, tx_ring->count - igb_desc_unused(tx_ring) + 1);
igb_clean_tx_ring(tx_ring);
}
}
else /* Force detection of hung controller every watchdog period */
tx_ring->detect_tx_hung = true;
}
Regards,
Mattias
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