linux-kernel - [PATCH net-next v2 06/10] mlx4: Avoid resetting MLX4_INTFF

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Message-Id: <20230813145127.10653-7-petr.pavlu@suse.com>
Date:   Sun, 13 Aug 2023 16:51:23 +0200
From:   Petr Pavlu <petr.pavlu@...e.com>
To:     tariqt@...dia.com, yishaih@...dia.com, leon@...nel.org
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, jgg@...pe.ca, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Petr Pavlu <petr.pavlu@...e.com>,
        Leon Romanovsky <leonro@...dia.com>
Subject: [PATCH net-next v2 06/10] mlx4: Avoid resetting MLX4_INTFF_BONDING per driver

The mlx4_core driver has a logic that allows a sub-driver to set the
MLX4_INTFF_BONDING flag which then causes that function mlx4_do_bond()
asks the sub-driver to fully re-probe a device when its bonding
configuration changes.

Performing this operation is disallowed in mlx4_register_interface()
when it is detected that any mlx4 device is multifunction (SRIOV). The
code then resets MLX4_INTFF_BONDING in the driver flags.

Move this check directly into mlx4_do_bond(). It provides a better
separation as mlx4_core no longer directly modifies the sub-driver flags
and it will allow to get rid of explicitly keeping track of all mlx4
devices by the intf.c code when it is switched to an auxiliary bus.

Signed-off-by: Petr Pavlu <petr.pavlu@...e.com>
Tested-by: Leon Romanovsky <leonro@...dia.com>
Reviewed-by: Leon Romanovsky <leonro@...dia.com>
Acked-by: Tariq Toukan <tariqt@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx4/intf.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/intf.c b/drivers/net/ethernet/mellanox/mlx4/intf.c
index 8b2c1404cb66..30aead34ce08 100644
--- a/drivers/net/ethernet/mellanox/mlx4/intf.c
+++ b/drivers/net/ethernet/mellanox/mlx4/intf.c
@@ -96,11 +96,6 @@ int mlx4_register_interface(struct mlx4_interface *intf)
 
 	list_add_tail(&intf->list, &intf_list);
 	list_for_each_entry(priv, &dev_list, dev_list) {
-		if (mlx4_is_mfunc(&priv->dev) && (intf->flags & MLX4_INTFF_BONDING)) {
-			mlx4_dbg(&priv->dev,
-				 "SRIOV, disabling HA mode for intf proto %d\n", intf->protocol);
-			intf->flags &= ~MLX4_INTFF_BONDING;
-		}
 		mlx4_add_device(intf, priv);
 	}
 
@@ -155,10 +150,18 @@ int mlx4_do_bond(struct mlx4_dev *dev, bool enable)
 
 	spin_lock_irqsave(&priv->ctx_lock, flags);
 	list_for_each_entry_safe(dev_ctx, temp_dev_ctx, &priv->ctx_list, list) {
-		if (dev_ctx->intf->flags & MLX4_INTFF_BONDING) {
-			list_add_tail(&dev_ctx->bond_list, &bond_list);
-			list_del(&dev_ctx->list);
+		if (!(dev_ctx->intf->flags & MLX4_INTFF_BONDING))
+			continue;
+
+		if (mlx4_is_mfunc(dev)) {
+			mlx4_dbg(dev,
+				 "SRIOV, disabled HA mode for intf proto %d\n",
+				 dev_ctx->intf->protocol);
+			continue;
 		}
+
+		list_add_tail(&dev_ctx->bond_list, &bond_list);
+		list_del(&dev_ctx->list);
 	}
 	spin_unlock_irqrestore(&priv->ctx_lock, flags);
 
-- 
2.35.3