netdev - Re: [net 09/15] net/mlx5e: Forbid devlink reload if IPSec rules are offloaded

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Date: Wed, 22 Nov 2023 10:13:45 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Saeed Mahameed <saeed@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
	Tariq Toukan <tariqt@...dia.com>, Jianbo Liu <jianbol@...dia.com>,
	Leon Romanovsky <leonro@...dia.com>
Subject: Re: [net 09/15] net/mlx5e: Forbid devlink reload if IPSec rules are
 offloaded

Wed, Nov 22, 2023 at 02:47:58AM CET, saeed@...nel.org wrote:
>From: Jianbo Liu <jianbol@...dia.com>
>
>When devlink reload, mlx5 IPSec module can't be safely cleaned up if
>there is any IPSec rule offloaded, so forbid it in this condition.
>
>Fixes: edd8b295f9e2 ("Merge branch 'mlx5-ipsec-packet-offload-support-in-eswitch-mode'")
>Signed-off-by: Jianbo Liu <jianbol@...dia.com>
>Signed-off-by: Leon Romanovsky <leonro@...dia.com>
>Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
>---
> drivers/net/ethernet/mellanox/mlx5/core/devlink.c |  5 +++++
> drivers/net/ethernet/mellanox/mlx5/core/eswitch.h |  2 ++
> .../mellanox/mlx5/core/eswitch_offloads.c         | 15 +++++++++++++++
> 3 files changed, 22 insertions(+)
>
>diff --git a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
>index 3e064234f6fe..8925e87a3ed5 100644
>--- a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
>+++ b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
>@@ -157,6 +157,11 @@ static int mlx5_devlink_reload_down(struct devlink *devlink, bool netns_change,
> 		return -EOPNOTSUPP;
> 	}
> 
>+	if (mlx5_eswitch_mode_is_blocked(dev)) {
>+		NL_SET_ERR_MSG_MOD(extack, "reload is unsupported if IPSec rules are configured");

That sounds a bit odd to me to be honest. Is pci device unbind forbidden
if ipsec rules are present too? This should be gracefully handled
instead of forbid.


>+		return -EOPNOTSUPP;
>+	}
>+
> 	if (mlx5_core_is_pf(dev) && pci_num_vf(pdev))
> 		NL_SET_ERR_MSG_MOD(extack, "reload while VFs are present is unfavorable");
> 
>diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
>index b674b57d05aa..88524c2a4355 100644
>--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
>+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
>@@ -846,6 +846,7 @@ void mlx5_eswitch_unblock_encap(struct mlx5_core_dev *dev);
> 
> int mlx5_eswitch_block_mode(struct mlx5_core_dev *dev);
> void mlx5_eswitch_unblock_mode(struct mlx5_core_dev *dev);
>+bool mlx5_eswitch_mode_is_blocked(struct mlx5_core_dev *dev);
> 
> static inline int mlx5_eswitch_num_vfs(struct mlx5_eswitch *esw)
> {
>@@ -947,6 +948,7 @@ static inline void mlx5_eswitch_unblock_encap(struct mlx5_core_dev *dev)
> 
> static inline int mlx5_eswitch_block_mode(struct mlx5_core_dev *dev) { return 0; }
> static inline void mlx5_eswitch_unblock_mode(struct mlx5_core_dev *dev) {}
>+static inline bool mlx5_eswitch_mode_is_blocked(struct mlx5_core_dev *dev) { return false; }
> static inline bool mlx5_eswitch_block_ipsec(struct mlx5_core_dev *dev)
> {
> 	return false;
>diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
>index bf78eeca401b..85c2a20e68fa 100644
>--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
>+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
>@@ -3693,6 +3693,21 @@ void mlx5_eswitch_unblock_mode(struct mlx5_core_dev *dev)
> 	up_write(&esw->mode_lock);
> }
> 
>+bool mlx5_eswitch_mode_is_blocked(struct mlx5_core_dev *dev)
>+{
>+	struct mlx5_eswitch *esw = dev->priv.eswitch;
>+	bool blocked;
>+
>+	if (!mlx5_esw_allowed(esw))
>+		return false;
>+
>+	down_write(&esw->mode_lock);
>+	blocked = esw->offloads.num_block_mode;
>+	up_write(&esw->mode_lock);
>+
>+	return blocked;
>+}
>+
> int mlx5_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
> 				  struct netlink_ext_ack *extack)
> {
>-- 
>2.42.0
>
>