[PATCH for v4.9 LTS 87/87] net/mlx5: E-Switch, Re-enable RoCE on mode change only after FDB destroy

[Levin, Alexander (Sasha Levin)]

From: Or Gerlitz <ogerl...@mellanox.com>

[ Upstream commit 5bae8c031053c69b4aa74b7f1ba15d4ec8426208 ]

We must re-enable RoCE on the e-switch management port (PF) only after 
destroying
the FDB in its switchdev/offloaded mode. Otherwise, when encapsulation is 
supported,
this re-enablement will fail.

Also, it's more natural and symmetric to disable RoCE on the PF before we create
the FDB under switchdev mode, so do that as well and revert if getting into 
error
during the mode change later.

Fixes: 9da34cd34e85 ('net/mlx5: Disable RoCE on the e-switch management [..]')
Signed-off-by: Or Gerlitz <ogerl...@mellanox.com>
Reviewed-by: Hadar Hen Zion <had...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
---
 .../ethernet/mellanox/mlx5/core/eswitch_offloads.c | 29 ++++++++++++++--------
 1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c 
b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index 6ffd5d2a70aa..52a38106448e 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -651,9 +651,14 @@ int esw_offloads_init(struct mlx5_eswitch *esw, int 
nvports)
        int vport;
        int err;
 
+       /* disable PF RoCE so missed packets don't go through RoCE steering */
+       mlx5_dev_list_lock();
+       mlx5_remove_dev_by_protocol(esw->dev, MLX5_INTERFACE_PROTOCOL_IB);
+       mlx5_dev_list_unlock();
+
        err = esw_create_offloads_fdb_table(esw, nvports);
        if (err)
-               return err;
+               goto create_fdb_err;
 
        err = esw_create_offloads_table(esw);
        if (err)
@@ -673,11 +678,6 @@ int esw_offloads_init(struct mlx5_eswitch *esw, int 
nvports)
                        goto err_reps;
        }
 
-       /* disable PF RoCE so missed packets don't go through RoCE steering */
-       mlx5_dev_list_lock();
-       mlx5_remove_dev_by_protocol(esw->dev, MLX5_INTERFACE_PROTOCOL_IB);
-       mlx5_dev_list_unlock();
-
        return 0;
 
 err_reps:
@@ -694,6 +694,13 @@ int esw_offloads_init(struct mlx5_eswitch *esw, int 
nvports)
 
 create_ft_err:
        esw_destroy_offloads_fdb_table(esw);
+
+create_fdb_err:
+       /* enable back PF RoCE */
+       mlx5_dev_list_lock();
+       mlx5_add_dev_by_protocol(esw->dev, MLX5_INTERFACE_PROTOCOL_IB);
+       mlx5_dev_list_unlock();
+
        return err;
 }
 
@@ -701,11 +708,6 @@ static int esw_offloads_stop(struct mlx5_eswitch *esw)
 {
        int err, err1, num_vfs = esw->dev->priv.sriov.num_vfs;
 
-       /* enable back PF RoCE */
-       mlx5_dev_list_lock();
-       mlx5_add_dev_by_protocol(esw->dev, MLX5_INTERFACE_PROTOCOL_IB);
-       mlx5_dev_list_unlock();
-
        mlx5_eswitch_disable_sriov(esw);
        err = mlx5_eswitch_enable_sriov(esw, num_vfs, SRIOV_LEGACY);
        if (err) {
@@ -715,6 +717,11 @@ static int esw_offloads_stop(struct mlx5_eswitch *esw)
                        esw_warn(esw->dev, "Failed setting eswitch back to 
offloads, err %d\n", err);
        }
 
+       /* enable back PF RoCE */
+       mlx5_dev_list_lock();
+       mlx5_add_dev_by_protocol(esw->dev, MLX5_INTERFACE_PROTOCOL_IB);
+       mlx5_dev_list_unlock();
+
        return err;
 }
 
-- 
2.11.0