On 12/09/2025 17:09, Simon Horman wrote:
> On Thu, Sep 11, 2025 at 09:31:07AM +0300, Tariq Toukan wrote:
>> From: Shay Drory <shayd@xxxxxxxxxx>
>>
>> Update the LAG implementation to support net namespace isolation.
>>
>> With recent changes to the devcom framework allowing namespace-aware
>> matching, the LAG layer is updated to register devcom clients with the
>> associated net namespace. This ensures that LAG formation only occurs
>> between mlx5 interfaces that reside in the same namespace.
>>
>> This change ensures that devices in different namespaces do not interfere
>> with each other's LAG setup and behavior. For example, if two PCI PFs are
>> in the same namespace, they are eligible to form a hardware LAG.
>>
>> In addition, reload behavior for LAG is adjusted to handle namespace
>> contexts appropriately.
>>
>> Signed-off-by: Shay Drory <shayd@xxxxxxxxxx>
>> Reviewed-by: Mark Bloch <mbloch@xxxxxxxxxx>
>> Reviewed-by: Parav Pandit <parav@xxxxxxxxxx>
>> Signed-off-by: Tariq Toukan <tariqt@xxxxxxxxxx>
>> ---
>> drivers/net/ethernet/mellanox/mlx5/core/devlink.c | 5 -----
>> drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c | 14 +++++++++++---
>> drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h | 1 +
>> 3 files changed, 12 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
>> index a0b68321355a..bfa44414be82 100644
>> --- a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
>> @@ -204,11 +204,6 @@ static int mlx5_devlink_reload_down(struct devlink *devlink, bool netns_change,
>> return 0;
>> }
>>
>> - if (mlx5_lag_is_active(dev)) {
>> - NL_SET_ERR_MSG_MOD(extack, "reload is unsupported in Lag mode");
>> - return -EOPNOTSUPP;
>> - }
>> -
>
> Maybe I'm missing something obvious. But I think this could do with
> some further commentary in the commit message. Or perhaps being a separate
> patch.
While one could split this into two patches, first enabling LAG creation
within a namespace, then separately removing the devlink reload restriction
that separation feels artificial.
Both changes are required to deliver complete support for LAG in namespaces
Since removing the reload restriction is a trivial change, it is better
to deliver the entire feature in this single patch.
Will clarify and add this justification to the commit message.
>
>> if (mlx5_core_is_mp_slave(dev)) {
>> NL_SET_ERR_MSG_MOD(extack, "reload is unsupported for multi port slave");
>> return -EOPNOTSUPP;
>
> ...
>
>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h
>> index c2f256bb2bc2..4918eee2b3da 100644
>> --- a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h
>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.h
>> @@ -67,6 +67,7 @@ struct mlx5_lag {
>> struct workqueue_struct *wq;
>> struct delayed_work bond_work;
>> struct notifier_block nb;
>> + possible_net_t net;
>
> nit: inconsistent indentation.
I prefer to avoid vertical alignment. I find that style
is often brittle and makes the code harder to maintain
over time.
Thanks for the review!
Mark
>
>> struct lag_mp lag_mp;
>> struct mlx5_lag_port_sel port_sel;
>> /* Protect lag fields/state changes */
>> --
>> 2.31.1
>>
>>
