[PATCH 5.14 157/169] net/mlx5: Lag, change multipath and bonding to be mutually exclusive

Greg Kroah-Hartman
2021-10-25T19:57:14Z

From: Maor Dickman <maord@nvidia.com>

[ Upstream commit 14fe2471c62816ba82546fb68369d957c3a58b59 ]

Both multipath and bonding events are changing the HW LAG state
independently.
Handling one of the features events while the other is already
enabled can cause unwanted behavior, for example handling
bonding event while multipath enabled will disable the lag and
cause multipath to stop working.

Fix it by ignoring bonding event while in multipath and ignoring FIB
events while in bonding mode.

Fixes: 544fe7c2e654 ("net/mlx5e: Activate HW multipath and handle port affinity based on FIB events")
Signed-off-by: Maor Dickman <maord@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c | 2 ++
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 2 ++
drivers/net/ethernet/mellanox/mlx5/core/lag.c | 4 ++++
drivers/net/ethernet/mellanox/mlx5/core/lag_mp.c | 13 ++++++++-----
drivers/net/ethernet/mellanox/mlx5/core/lag_mp.h | 2 ++
include/linux/mlx5/driver.h | 1 -
6 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
index 1e2d117082d4..603d9884b6bd 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
@@ -10,6 +10,8 @@
#include "en_tc.h"
#include "rep/tc.h"
#include "rep/neigh.h"
+#include "lag.h"
+#include "lag_mp.h"

struct mlx5e_tc_tun_route_attr {
struct net_device *out_dev;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 6eba574c5a36..c757209b47ee 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -72,6 +72,8 @@
#include "lib/fs_chains.h"
#include "diag/en_tc_tracepoint.h"
#include <asm/div64.h>
+#include "lag.h"
+#include "lag_mp.h"

#define nic_chains(priv) ((priv)->fs.tc.chains)
#define MLX5_MH_ACT_SZ MLX5_UN_SZ_BYTES(set_add_copy_action_in_auto)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag.c b/drivers/net/ethernet/mellanox/mlx5/core/lag.c
index 814440aae1ae..be6e7e10b252 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag.c
@@ -375,6 +375,10 @@ static void mlx5_do_bond(struct mlx5_lag *ldev)
if (!mlx5_lag_is_ready(ldev)) {
do_bond = false;
} else {
+ /* VF LAG is in multipath mode, ignore bond change requests */
+ if (mlx5_lag_is_multipath(dev0))
+ return;
+
tracker = ldev->tracker;

do_bond = tracker.is_bonded && mlx5_lag_check_prereq(ldev);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag_mp.c b/drivers/net/ethernet/mellanox/mlx5/core/lag_mp.c
index 516bfc2bd797..577e5d02bfdd 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag_mp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag_mp.c
@@ -9,20 +9,23 @@
#include "eswitch.h"
#include "lib/mlx5.h"

+static bool __mlx5_lag_is_multipath(struct mlx5_lag *ldev)
+{
+ return !!(ldev->flags & MLX5_LAG_FLAG_MULTIPATH);
+}
+
static bool mlx5_lag_multipath_check_prereq(struct mlx5_lag *ldev)
{
if (!mlx5_lag_is_ready(ldev))
return false;

+ if (__mlx5_lag_is_active(ldev) && !__mlx5_lag_is_multipath(ldev))
+ return false;
+
return mlx5_esw_multipath_prereq(ldev->pf[MLX5_LAG_P1].dev,
ldev->pf[MLX5_LAG_P2].dev);
}

-static bool __mlx5_lag_is_multipath(struct mlx5_lag *ldev)
-{
- return !!(ldev->flags & MLX5_LAG_FLAG_MULTIPATH);
-}
-
bool mlx5_lag_is_multipath(struct mlx5_core_dev *dev)
{
struct mlx5_lag *ldev;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag_mp.h b/drivers/net/ethernet/mellanox/mlx5/core/lag_mp.h
index 729c839397a8..dea199e79bed 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag_mp.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag_mp.h
@@ -24,12 +24,14 @@ struct lag_mp {
void mlx5_lag_mp_reset(struct mlx5_lag *ldev);
int mlx5_lag_mp_init(struct mlx5_lag *ldev);
void mlx5_lag_mp_cleanup(struct mlx5_lag *ldev);
+bool mlx5_lag_is_multipath(struct mlx5_core_dev *dev);

#else /* CONFIG_MLX5_ESWITCH */

static inline void mlx5_lag_mp_reset(struct mlx5_lag *ldev) {};
static inline int mlx5_lag_mp_init(struct mlx5_lag *ldev) { return 0; }
static inline void mlx5_lag_mp_cleanup(struct mlx5_lag *ldev) {}
+bool mlx5_lag_is_multipath(struct mlx5_core_dev *dev) { return false; }

#endif /* CONFIG_MLX5_ESWITCH */
#endif /* __MLX5_LAG_MP_H__ */
diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index 25a8be58d289..9b8add8eac0c 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -1135,7 +1135,6 @@ int mlx5_cmd_create_vport_lag(struct mlx5_core_dev *dev);
int mlx5_cmd_destroy_vport_lag(struct mlx5_core_dev *dev);
bool mlx5_lag_is_roce(struct mlx5_core_dev *dev);
bool mlx5_lag_is_sriov(struct mlx5_core_dev *dev);
-bool mlx5_lag_is_multipath(struct mlx5_core_dev *dev);
bool mlx5_lag_is_active(struct mlx5_core_dev *dev);
struct net_device *mlx5_lag_get_roce_netdev(struct mlx5_core_dev *dev);
u8 mlx5_lag_get_slave_port(struct mlx5_core_dev *dev,
--
2.33.0