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net/mlx5: E-Switch, add representor lifecycle lock

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Add a per-E-Switch mutex for serializing representor lifecycle work and
provide small helpers for taking and dropping it. Initialize and destroy
the mutex with the E-Switch offloads state.

Add the lock and helper API first. Follow-up patches will take the lock in
the individual representor lifecycle components. This keeps the functional
changes split by component and leaves this patch without intended behavior
change, making the series easier to review and bisectable.

Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260503202726.266415-4-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Mark Bloch 2026-05-03 23:27:22 +03:00 committed by Jakub Kicinski
parent 386ef557f6
commit 9b8468f001
2 changed files with 18 additions and 0 deletions
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6
drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
View File

@ -316,6 +316,7 @@ struct mlx5_esw_offload {
DECLARE_HASHTABLE(termtbl_tbl, 8);
struct mutex termtbl_mutex; /* protects termtbl hash */
struct xarray vhca_map;
struct mutex reps_lock; /* protects representor load/unload/register */
const struct mlx5_eswitch_rep_ops *rep_ops[NUM_REP_TYPES];
u8 inline_mode;
atomic64_t num_flows;
@ -951,6 +952,8 @@ mlx5_esw_lag_demux_fg_create(struct mlx5_eswitch *esw,
struct mlx5_flow_handle *
mlx5_esw_lag_demux_rule_create(struct mlx5_eswitch *esw, u16 vport_num,
struct mlx5_flow_table *lag_ft);
void mlx5_esw_reps_block(struct mlx5_eswitch *esw);
void mlx5_esw_reps_unblock(struct mlx5_eswitch *esw);
#else /* CONFIG_MLX5_ESWITCH */
/* eswitch API stubs */
static inline int mlx5_eswitch_init(struct mlx5_core_dev *dev) { return 0; }
@ -1028,6 +1031,9 @@ mlx5_esw_host_functions_enabled(const struct mlx5_core_dev *dev)
return true;
}
static inline void mlx5_esw_reps_block(struct mlx5_eswitch *esw) {}
static inline void mlx5_esw_reps_unblock(struct mlx5_eswitch *esw) {}
static inline bool
mlx5_esw_vport_vhca_id(struct mlx5_eswitch *esw, u16 vportn, u16 *vhca_id)
{

12
drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
View File

@ -2413,6 +2413,16 @@ static int esw_create_restore_table(struct mlx5_eswitch *esw)
return err;
}
void mlx5_esw_reps_block(struct mlx5_eswitch *esw)
{
mutex_lock(&esw->offloads.reps_lock);
}
void mlx5_esw_reps_unblock(struct mlx5_eswitch *esw)
{
mutex_unlock(&esw->offloads.reps_lock);
}
static void esw_mode_change(struct mlx5_eswitch *esw, u16 mode)
{
mlx5_devcom_comp_lock(esw->dev->priv.hca_devcom_comp);
@ -2645,6 +2655,7 @@ static void esw_offloads_cleanup_reps(struct mlx5_eswitch *esw)
mlx5_esw_for_each_rep(esw, i, rep)
mlx5_esw_offloads_rep_cleanup(esw, rep);
xa_destroy(&esw->offloads.vport_reps);
mutex_destroy(&esw->offloads.reps_lock);
}
static int esw_offloads_init_reps(struct mlx5_eswitch *esw)
@ -2654,6 +2665,7 @@ static int esw_offloads_init_reps(struct mlx5_eswitch *esw)
int err;
xa_init(&esw->offloads.vport_reps);
mutex_init(&esw->offloads.reps_lock);
mlx5_esw_for_each_vport(esw, i, vport) {
err = mlx5_esw_offloads_rep_add(esw, vport);