netdev - [net-next 06/15] net/mlx5e: Use a barrier after updating txq2sq

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Date:   Mon, 14 Feb 2022 22:32:20 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Tariq Toukan <tariqt@...dia.com>,
        Maxim Mikityanskiy <maximmi@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [net-next 06/15] net/mlx5e: Use a barrier after updating txq2sq

From: Maxim Mikityanskiy <maximmi@...dia.com>

mlx5e_build_txq_maps updates txq2sq while TX queues are stopped. Add a
barrier to ensure that these changes are visible before the queues are
started and mlx5e_xmit reads from txq2sq.

This commit handles regular TX queues. Synchronization between HTB TX
queues and mlx5e_xmit is handled in the following commit.

Signed-off-by: Maxim Mikityanskiy <maximmi@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index d84d9cdbdbd4..e64c3cb15ef6 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -2688,10 +2688,10 @@ static void mlx5e_build_txq_maps(struct mlx5e_priv *priv)
 	}
 
 	if (!priv->channels.ptp)
-		return;
+		goto out;
 
 	if (!test_bit(MLX5E_PTP_STATE_TX, priv->channels.ptp->state))
-		return;
+		goto out;
 
 	for (tc = 0; tc < num_tc; tc++) {
 		struct mlx5e_ptp *c = priv->channels.ptp;
@@ -2700,6 +2700,13 @@ static void mlx5e_build_txq_maps(struct mlx5e_priv *priv)
 		priv->txq2sq[sq->txq_ix] = sq;
 		priv->port_ptp_tc2realtxq[tc] = priv->num_tc_x_num_ch + tc;
 	}
+
+out:
+	/* Make the change to txq2sq visible before the queue is started.
+	 * As mlx5e_xmit runs under a spinlock, there is an implicit ACQUIRE,
+	 * which pairs with this barrier.
+	 */
+	smp_wmb();
 }
 
 static void mlx5e_update_num_tc_x_num_ch(struct mlx5e_priv *priv)
-- 
2.34.1