netdev - [PATCH net-next 6/7] net/mlx5e: Pass old channels as argument to mlx5e_switch_priv

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Message-ID: <1761201820-923638-7-git-send-email-tariqt@nvidia.com>
Date: Thu, 23 Oct 2025 09:43:39 +0300
From: Tariq Toukan <tariqt@...dia.com>
To: Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David
 S. Miller" <davem@...emloft.net>
CC: Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
	Tariq Toukan <tariqt@...dia.com>, Mark Bloch <mbloch@...dia.com>,
	<netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Gal Pressman <gal@...dia.com>, "Carolina
 Jubran" <cjubran@...dia.com>, Dragos Tatulea <dtatulea@...dia.com>
Subject: [PATCH net-next 6/7] net/mlx5e: Pass old channels as argument to mlx5e_switch_priv_channels

Let the caller function mlx5e_safe_switch_params() maintain a copy
of the old channels, and pass it to mlx5e_switch_priv_channels().

This is in preparation for the next patch.

Signed-off-by: Tariq Toukan <tariqt@...dia.com>
Reviewed-by: Carolina Jubran <cjubran@...dia.com>
---
 .../net/ethernet/mellanox/mlx5/core/en_main.c | 25 +++++++++++++------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 8e13f2542d8d..cd2842dcffcd 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -3356,12 +3356,12 @@ static int mlx5e_switch_priv_params(struct mlx5e_priv *priv,
 }
 
 static int mlx5e_switch_priv_channels(struct mlx5e_priv *priv,
+				      struct mlx5e_channels *old_chs,
 				      struct mlx5e_channels *new_chs,
 				      mlx5e_fp_preactivate preactivate,
 				      void *context)
 {
 	struct net_device *netdev = priv->netdev;
-	struct mlx5e_channels old_chs;
 	int carrier_ok;
 	int err = 0;
 
@@ -3370,7 +3370,6 @@ static int mlx5e_switch_priv_channels(struct mlx5e_priv *priv,
 
 	mlx5e_deactivate_priv_channels(priv);
 
-	old_chs = priv->channels;
 	priv->channels = *new_chs;
 
 	/* New channels are ready to roll, call the preactivate hook if needed
@@ -3379,12 +3378,12 @@ static int mlx5e_switch_priv_channels(struct mlx5e_priv *priv,
 	if (preactivate) {
 		err = preactivate(priv, context);
 		if (err) {
-			priv->channels = old_chs;
+			priv->channels = *old_chs;
 			goto out;
 		}
 	}
 
-	mlx5e_close_channels(&old_chs);
+	mlx5e_close_channels(old_chs);
 	priv->profile->update_rx(priv);
 
 	mlx5e_selq_apply(&priv->selq);
@@ -3403,16 +3402,20 @@ int mlx5e_safe_switch_params(struct mlx5e_priv *priv,
 			     mlx5e_fp_preactivate preactivate,
 			     void *context, bool reset)
 {
-	struct mlx5e_channels *new_chs;
+	struct mlx5e_channels *old_chs, *new_chs;
 	int err;
 
 	reset &= test_bit(MLX5E_STATE_OPENED, &priv->state);
 	if (!reset)
 		return mlx5e_switch_priv_params(priv, params, preactivate, context);
 
+	old_chs = kzalloc(sizeof(*old_chs), GFP_KERNEL);
 	new_chs = kzalloc(sizeof(*new_chs), GFP_KERNEL);
-	if (!new_chs)
-		return -ENOMEM;
+	if (!old_chs || !new_chs) {
+		err = -ENOMEM;
+		goto err_free_chs;
+	}
+
 	new_chs->params = *params;
 
 	mlx5e_selq_prepare_params(&priv->selq, &new_chs->params);
@@ -3421,11 +3424,15 @@ int mlx5e_safe_switch_params(struct mlx5e_priv *priv,
 	if (err)
 		goto err_cancel_selq;
 
-	err = mlx5e_switch_priv_channels(priv, new_chs, preactivate, context);
+	*old_chs = priv->channels;
+
+	err = mlx5e_switch_priv_channels(priv, old_chs, new_chs,
+					 preactivate, context);
 	if (err)
 		goto err_close;
 
 	kfree(new_chs);
+	kfree(old_chs);
 	return 0;
 
 err_close:
@@ -3433,7 +3440,9 @@ int mlx5e_safe_switch_params(struct mlx5e_priv *priv,
 
 err_cancel_selq:
 	mlx5e_selq_cancel(&priv->selq);
+err_free_chs:
 	kfree(new_chs);
+	kfree(old_chs);
 	return err;
 }
 
-- 
2.31.1