netdev - [net-next 15/15] net/mlx5: fw_tracer, Add support for unrecognized string

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Date:   Tue,  7 Feb 2023 16:37:12 -0800
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:     Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>,
        Shay Drory <shayd@...dia.com>, Moshe Shemesh <moshe@...dia.com>
Subject: [net-next 15/15] net/mlx5: fw_tracer, Add support for unrecognized string

From: Shay Drory <shayd@...dia.com>

In case FW is publishing a string which isn't found in the driver's
string DBs, keep the string as raw data.

Signed-off-by: Shay Drory <shayd@...dia.com>
Reviewed-by: Moshe Shemesh <moshe@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 .../mellanox/mlx5/core/diag/fw_tracer.c       | 25 +++++++++++++++++--
 .../mellanox/mlx5/core/diag/fw_tracer.h       |  1 +
 2 files changed, 24 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 46f1e866bf64..f7864d51d4c4 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
@@ -465,6 +465,7 @@ static void poll_trace(struct mlx5_fw_tracer *tracer,
 
 	tracer_event->event_id = MLX5_GET(tracer_event, trace, event_id);
 	tracer_event->lost_event = MLX5_GET(tracer_event, trace, lost);
+	tracer_event->out = trace;
 
 	switch (tracer_event->event_id) {
 	case TRACER_EVENT_TYPE_TIMESTAMP:
@@ -587,6 +588,26 @@ void mlx5_tracer_print_trace(struct tracer_string_format *str_frmt,
 	mlx5_tracer_clean_message(str_frmt);
 }
 
+static int mlx5_tracer_handle_raw_string(struct mlx5_fw_tracer *tracer,
+					 struct tracer_event *tracer_event)
+{
+	struct tracer_string_format *cur_string;
+
+	cur_string = mlx5_tracer_message_insert(tracer, tracer_event);
+	if (!cur_string)
+		return -1;
+
+	cur_string->event_id = tracer_event->event_id;
+	cur_string->timestamp = tracer_event->string_event.timestamp;
+	cur_string->lost = tracer_event->lost_event;
+	cur_string->string = "0x%08x%08x";
+	cur_string->num_of_params = 2;
+	cur_string->params[0] = upper_32_bits(*tracer_event->out);
+	cur_string->params[1] = lower_32_bits(*tracer_event->out);
+	list_add_tail(&cur_string->list, &tracer->ready_strings_list);
+	return 0;
+}
+
 static int mlx5_tracer_handle_string_trace(struct mlx5_fw_tracer *tracer,
 					   struct tracer_event *tracer_event)
 {
@@ -595,7 +616,7 @@ static int mlx5_tracer_handle_string_trace(struct mlx5_fw_tracer *tracer,
 	if (tracer_event->string_event.tdsn == 0) {
 		cur_string = mlx5_tracer_get_string(tracer, tracer_event);
 		if (!cur_string)
-			return -1;
+			return mlx5_tracer_handle_raw_string(tracer, tracer_event);
 
 		cur_string->num_of_params = mlx5_tracer_get_num_of_params(cur_string->string);
 		cur_string->last_param_num = 0;
@@ -610,7 +631,7 @@ static int mlx5_tracer_handle_string_trace(struct mlx5_fw_tracer *tracer,
 		if (!cur_string) {
 			pr_debug("%s Got string event for unknown string tmsn: %d\n",
 				 __func__, tracer_event->string_event.tmsn);
-			return -1;
+			return mlx5_tracer_handle_raw_string(tracer, tracer_event);
 		}
 		cur_string->last_param_num += 1;
 		if (cur_string->last_param_num > TRACER_MAX_PARAMS) {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.h b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.h
index 873c1eb38e49..5c548bb74f07 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.h
@@ -166,6 +166,7 @@ struct tracer_event {
 		struct tracer_string_event string_event;
 		struct tracer_timestamp_event timestamp_event;
 	};
+	u64 *out;
 };
 
 struct mlx5_ifc_tracer_event_bits {
-- 
2.39.1