netdev - [net 5/6] net/mlx5: Rearm the FW tracer after each tracer event

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Message-Id: <20220608185855.19818-6-saeed@kernel.org>
Date:   Wed,  8 Jun 2022 11:58:54 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     netdev@...r.kernel.org, Feras Daoud <ferasda@...dia.com>,
        Roy Novich <royno@...dia.com>,
        Moshe Shemesh <moshe@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [net 5/6] net/mlx5: Rearm the FW tracer after each tracer event

From: Feras Daoud <ferasda@...dia.com>

The current design does not arm the tracer if traces are available before
the tracer string database is fully loaded, leading to an unfunctional tracer.
This fix will rearm the tracer every time the FW triggers tracer event
regardless of the tracer strings database status.

Fixes: c71ad41ccb0c ("net/mlx5: FW tracer, events handling")
Signed-off-by: Feras Daoud <ferasda@...dia.com>
Signed-off-by: Roy Novich <royno@...dia.com>
Reviewed-by: Moshe Shemesh <moshe@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
index eae9aa9c0811..978a2bb8e122 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
@@ -675,6 +675,9 @@ static void mlx5_fw_tracer_handle_traces(struct work_struct *work)
 	if (!tracer->owner)
 		return;
 
+	if (unlikely(!tracer->str_db.loaded))
+		goto arm;
+
 	block_count = tracer->buff.size / TRACER_BLOCK_SIZE_BYTE;
 	start_offset = tracer->buff.consumer_index * TRACER_BLOCK_SIZE_BYTE;
 
@@ -732,6 +735,7 @@ static void mlx5_fw_tracer_handle_traces(struct work_struct *work)
 						      &tmp_trace_block[TRACES_PER_BLOCK - 1]);
 	}
 
+arm:
 	mlx5_fw_tracer_arm(dev);
 }
 
@@ -1136,8 +1140,7 @@ static int fw_tracer_event(struct notifier_block *nb, unsigned long action, void
 		queue_work(tracer->work_queue, &tracer->ownership_change_work);
 		break;
 	case MLX5_TRACER_SUBTYPE_TRACES_AVAILABLE:
-		if (likely(tracer->str_db.loaded))
-			queue_work(tracer->work_queue, &tracer->handle_traces_work);
+		queue_work(tracer->work_queue, &tracer->handle_traces_work);
 		break;
 	default:
 		mlx5_core_dbg(dev, "FWTracer: Event with unrecognized subtype: sub_type %d\n",
-- 
2.36.1