netdev - [net-next 09/15] net/mlx5e: Print delta since last transmit per SQ upon TX timeout

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Message-Id: <20180119213457.23378-10-saeedm@mellanox.com>
Date:   Fri, 19 Jan 2018 23:34:51 +0200
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Eran Ben Elisha <eranbe@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [net-next 09/15] net/mlx5e: Print delta since last transmit per SQ upon TX timeout

From: Eran Ben Elisha <eranbe@...lanox.com>

When driver callback for TX timeout is being called, it handles all
stopped xmit queues (not only the ones which their timeout expired).
Add usecs since last transmit to TX timeout logs per send queue in order
to monitor if the queue timeout expired.

Signed-off-by: Eran Ben Elisha <eranbe@...lanox.com>
Reviewed-by: Tariq Toukan <tariqt@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 8e380a89ec63..12196d4d958e 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -3766,14 +3766,16 @@ static void mlx5e_tx_timeout(struct net_device *dev)
 	netdev_err(dev, "TX timeout detected\n");
 
 	for (i = 0; i < priv->channels.num * priv->channels.params.num_tc; i++) {
+		struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, i);
 		struct mlx5e_txqsq *sq = priv->txq2sq[i];
 
-		if (!netif_xmit_stopped(netdev_get_tx_queue(dev, i)))
+		if (!netif_xmit_stopped(dev_queue))
 			continue;
 		sched_work = true;
 		clear_bit(MLX5E_SQ_STATE_ENABLED, &sq->state);
-		netdev_err(dev, "TX timeout on queue: %d, SQ: 0x%x, CQ: 0x%x, SQ Cons: 0x%x SQ Prod: 0x%x\n",
-			   i, sq->sqn, sq->cq.mcq.cqn, sq->cc, sq->pc);
+		netdev_err(dev, "TX timeout on queue: %d, SQ: 0x%x, CQ: 0x%x, SQ Cons: 0x%x SQ Prod: 0x%x, usecs since last trans: %u\n",
+			   i, sq->sqn, sq->cq.mcq.cqn, sq->cc, sq->pc,
+			   jiffies_to_usecs(jiffies - dev_queue->trans_start));
 	}
 
 	if (sched_work && test_bit(MLX5E_STATE_OPENED, &priv->state))
-- 
2.13.0