net/mlx5: E-Switch, Allow transition to offloads mode for ECPF

Currently, the e-switch driver requires going to legacy mode before
changing to the offloads mode. This makes sense for regular case as
the legacy mode is done by creating VFs.

However, it's problematic when ECPF is the eswitch manager. In such
case, ECPF will control the vports on peer host including the peer
PF and VFs. But ECPF doesn't need and shall not create VFs as the
VFs are created in the peer PF host.

Grant ECPF the ability to change from none to the offloads mode. Note
that currently the only way to go back to none mode is by unloading
the ECPF driver.

Signed-off-by: Bodong Wang <bodong@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index 91c4095ac79eee8c0835fe7c7d01306db95e53bb..f2260391be5b952478175de9be8235b3154c4ccf 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -1250,7 +1250,8 @@ static int esw_offloads_start(struct mlx5_eswitch *esw,
 {
        int err, err1, num_vfs = esw->dev->priv.sriov.num_vfs;
 
-       if (esw->mode != SRIOV_LEGACY) {
+       if (esw->mode != SRIOV_LEGACY &&
+           !mlx5_core_is_ecpf_esw_manager(esw->dev)) {
                NL_SET_ERR_MSG_MOD(extack,
                                   "Can't set offloads mode, SRIOV legacy not enabled");
                return -EINVAL;
@@ -1846,7 +1847,8 @@ static int mlx5_devlink_eswitch_check(struct devlink *devlink)
        if(!MLX5_ESWITCH_MANAGER(dev))
                return -EPERM;
 
-       if (dev->priv.eswitch->mode == SRIOV_NONE)
+       if (dev->priv.eswitch->mode == SRIOV_NONE &&
+           !mlx5_core_is_ecpf_esw_manager(dev))
                return -EOPNOTSUPP;
 
        return 0;