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| author | Eric Dumazet <edumazet@google.com> | 2016-04-23 11:35:46 -0700 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-07-12 08:48:09 -0400 |
| commit | 9a6ca41f366ea39cac1f175ebda8f209c5271d57 (patch) | |
| tree | abecfcaa8fc6a17489face7f11fa5f62bd4163bd | |
| parent | d06f8ffbe758cb0e4ff7ba8e311ef496bcaf9532 (diff) | |
| download | lwn-9a6ca41f366ea39cac1f175ebda8f209c5271d57.tar.gz lwn-9a6ca41f366ea39cac1f175ebda8f209c5271d57.zip | |
net/mlx4_en: fix spurious timestamping callbacks
[ Upstream commit fc96256c906362e845d848d0f6a6354450059e81 ]
When multiple skb are TX-completed in a row, we might incorrectly keep
a timestamp of a prior skb and cause extra work.
Fixes: ec693d47010e8 ("net/mlx4_en: Add HW timestamping (TS) support")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Reviewed-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/en_tx.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c index 5980d3fe597c..fdc592ac2529 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c @@ -391,7 +391,6 @@ static bool mlx4_en_process_tx_cq(struct net_device *dev, u32 packets = 0; u32 bytes = 0; int factor = priv->cqe_factor; - u64 timestamp = 0; int done = 0; int budget = priv->tx_work_limit; u32 last_nr_txbb; @@ -431,9 +430,12 @@ static bool mlx4_en_process_tx_cq(struct net_device *dev, new_index = be16_to_cpu(cqe->wqe_index) & size_mask; do { + u64 timestamp = 0; + txbbs_skipped += last_nr_txbb; ring_index = (ring_index + last_nr_txbb) & size_mask; - if (ring->tx_info[ring_index].ts_requested) + + if (unlikely(ring->tx_info[ring_index].ts_requested)) timestamp = mlx4_en_get_cqe_ts(cqe); /* free next descriptor */ |