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Subject[PATCH v2] ice/ptp: fix the PTP worker retrying indefinitely if the link went down
Date
When the link goes down the ice_ptp_tx_tstamp() may loop re-trying to
process the packets till the 2 seconds timeout finally drops them.
In such a case it makes sense to just drop them right away.

Signed-off-by: Daniel Vacek <neelx@redhat.com>
---
drivers/net/ethernet/intel/ice/ice_ptp.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index d63161d73eb16..cb776a7199839 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -680,6 +680,7 @@ static bool ice_ptp_tx_tstamp(struct ice_ptp_tx *tx)
struct ice_pf *pf;
struct ice_hw *hw;
u64 tstamp_ready;
+ bool link_up;
int err;
u8 idx;

@@ -695,11 +696,14 @@ static bool ice_ptp_tx_tstamp(struct ice_ptp_tx *tx)
if (err)
return false;

+ /* Drop packets if the link went down */
+ link_up = hw->port_info->phy.link_info.link_info & ICE_AQ_LINK_UP;
+
for_each_set_bit(idx, tx->in_use, tx->len) {
struct skb_shared_hwtstamps shhwtstamps = {};
u8 phy_idx = idx + tx->offset;
u64 raw_tstamp = 0, tstamp;
- bool drop_ts = false;
+ bool drop_ts = !link_up;
struct sk_buff *skb;

/* Drop packets which have waited for more than 2 seconds */
@@ -728,7 +732,7 @@ static bool ice_ptp_tx_tstamp(struct ice_ptp_tx *tx)
ice_trace(tx_tstamp_fw_req, tx->tstamps[idx].skb, idx);

err = ice_read_phy_tstamp(hw, tx->block, phy_idx, &raw_tstamp);
- if (err)
+ if (err && !drop_ts)
continue;

ice_trace(tx_tstamp_fw_done, tx->tstamps[idx].skb, idx);
--
2.39.0
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