Ejemplo n.º 1
0
/**
 * i40e_ptp_rx_hang - Detect error case when Rx timestamp registers are hung
 * @pf: The PF private data structure
 * @vsi: The VSI with the rings relevant to 1588
 *
 * This watchdog task is scheduled to detect error case where hardware has
 * dropped an Rx packet that was timestamped when the ring is full. The
 * particular error is rare but leaves the device in a state unable to timestamp
 * any future packets.
 **/
void i40e_ptp_rx_hang(struct i40e_pf *pf)
{
	struct i40e_hw *hw = &pf->hw;
	unsigned int i, cleared = 0;

	/* Since we cannot turn off the Rx timestamp logic if the device is
	 * configured for Tx timestamping, we check if Rx timestamping is
	 * configured. We don't want to spuriously warn about Rx timestamp
	 * hangs if we don't care about the timestamps.
	 */
	if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_rx)
		return;

	spin_lock_bh(&pf->ptp_rx_lock);

	/* Update current latch times for Rx events */
	i40e_ptp_get_rx_events(pf);

	/* Check all the currently latched Rx events and see whether they have
	 * been latched for over a second. It is assumed that any timestamp
	 * should have been cleared within this time, or else it was captured
	 * for a dropped frame that the driver never received. Thus, we will
	 * clear any timestamp that has been latched for over 1 second.
	 */
	for (i = 0; i < 4; i++) {
		if ((pf->latch_event_flags & BIT(i)) &&
		    time_is_before_jiffies(pf->latch_events[i] + HZ)) {
			rd32(hw, I40E_PRTTSYN_RXTIME_H(i));
			pf->latch_event_flags &= ~BIT(i);
			cleared++;
		}
	}

	spin_unlock_bh(&pf->ptp_rx_lock);

	/* Log a warning if more than 2 timestamps got dropped in the same
	 * check. We don't want to warn about all drops because it can occur
	 * in normal scenarios such as PTP frames on multicast addresses we
	 * aren't listening to. However, administrator should know if this is
	 * the reason packets aren't receiving timestamps.
	 */
	if (cleared > 2)
		dev_dbg(&pf->pdev->dev,
			"Dropped %d missed RXTIME timestamp events\n",
			cleared);

	/* Finally, update the rx_hwtstamp_cleared counter */
	pf->rx_hwtstamp_cleared += cleared;
}
Ejemplo n.º 2
0
/**
 * i40e_ptp_rx_hang - Detect error case when Rx timestamp registers are hung
 * @vsi: The VSI with the rings relevant to 1588
 *
 * This watchdog task is scheduled to detect error case where hardware has
 * dropped an Rx packet that was timestamped when the ring is full. The
 * particular error is rare but leaves the device in a state unable to timestamp
 * any future packets.
 **/
void i40e_ptp_rx_hang(struct i40e_vsi *vsi)
{
	struct i40e_pf *pf = vsi->back;
	struct i40e_hw *hw = &pf->hw;
	int i;

	/* Since we cannot turn off the Rx timestamp logic if the device is
	 * configured for Tx timestamping, we check if Rx timestamping is
	 * configured. We don't want to spuriously warn about Rx timestamp
	 * hangs if we don't care about the timestamps.
	 */
	if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_rx)
		return;

	spin_lock_bh(&pf->ptp_rx_lock);

	/* Update current latch times for Rx events */
	i40e_ptp_get_rx_events(pf);

	/* Check all the currently latched Rx events and see whether they have
	 * been latched for over a second. It is assumed that any timestamp
	 * should have been cleared within this time, or else it was captured
	 * for a dropped frame that the driver never received. Thus, we will
	 * clear any timestamp that has been latched for over 1 second.
	 */
	for (i = 0; i < 4; i++) {
		if ((pf->latch_event_flags & BIT(i)) &&
		    time_is_before_jiffies(pf->latch_events[i] + HZ)) {
			rd32(hw, I40E_PRTTSYN_RXTIME_H(i));
			pf->latch_event_flags &= ~BIT(i);
			pf->rx_hwtstamp_cleared++;
			dev_warn(&pf->pdev->dev,
				 "Clearing a missed Rx timestamp event for RXTIME[%d]\n",
				 i);
		}
	}

	spin_unlock_bh(&pf->ptp_rx_lock);
}
Ejemplo n.º 3
0
/**
 * i40e_ptp_rx_hwtstamp - Utility function which checks for an Rx timestamp
 * @pf: Board private structure
 * @skb: Particular skb to send timestamp with
 * @index: Index into the receive timestamp registers for the timestamp
 *
 * The XL710 receives a notification in the receive descriptor with an offset
 * into the set of RXTIME registers where the timestamp is for that skb. This
 * function goes and fetches the receive timestamp from that offset, if a valid
 * one exists. The RXTIME registers are in ns, so we must convert the result
 * first.
 **/
void i40e_ptp_rx_hwtstamp(struct i40e_pf *pf, struct sk_buff *skb, u8 index)
{
	u32 prttsyn_stat, hi, lo;
	struct i40e_hw *hw;
	u64 ns;

	/* Since we cannot turn off the Rx timestamp logic if the device is
	 * doing Tx timestamping, check if Rx timestamping is configured.
	 */
	if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_rx)
		return;

	hw = &pf->hw;

	spin_lock_bh(&pf->ptp_rx_lock);

	/* Get current Rx events and update latch times */
	prttsyn_stat = i40e_ptp_get_rx_events(pf);

	/* TODO: Should we warn about missing Rx timestamp event? */
	if (!(prttsyn_stat & BIT(index))) {
		spin_unlock_bh(&pf->ptp_rx_lock);
		return;
	}

	/* Clear the latched event since we're about to read its register */
	pf->latch_event_flags &= ~BIT(index);

	lo = rd32(hw, I40E_PRTTSYN_RXTIME_L(index));
	hi = rd32(hw, I40E_PRTTSYN_RXTIME_H(index));

	spin_unlock_bh(&pf->ptp_rx_lock);

	ns = (((u64)hi) << 32) | lo;

	i40e_ptp_convert_to_hwtstamp(skb_hwtstamps(skb), ns);
}