diff options
| author |   Vlad Buslov <vladbu@mellanox.com> | 2018-11-18 13:12:59 +0200 |
|---|---|---|
| committer |   Saeed Mahameed <saeedm@mellanox.com> | 2019-07-29 16:40:25 -0700 |
| commit | 525e84bea52be145b0ae863ff8d242ce273e3bc6 (patch) | |
| tree | 18bb79fb523e1a7638bd0c7dcfdc72c8b32946d3 /drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c | |
| parent | net/mlx5e: Protect unready flows with dedicated lock (diff) | |
| download | linux-dev-525e84bea52be145b0ae863ff8d242ce273e3bc6.tar.xz linux-dev-525e84bea52be145b0ae863ff8d242ce273e3bc6.zip | |
net/mlx5e: Eswitch, change offloads num_flows type to atomic64
Eswitch implements its own locking by means of state_lock mutex and
multiple fine-grained lock in containing data structures, and is supposed
to not rely on rtnl lock. However, eswitch offloads num_flows type is a
regular long long integer and cannot be modified concurrently. This is an
implicit assumptions that mlx5 tc is serialized (by rtnl lock or any other
means). In order to remove implicit dependency on rtnl lock, change
num_flows type to atomic64 to allow concurrent modifications.
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Reviewed-by: Jianbo Liu <jianbol@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c index 089ae4d48a82..244ad1893691 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c @@ -233,7 +233,7 @@ mlx5_eswitch_add_offloaded_rule(struct mlx5_eswitch *esw, if (IS_ERR(rule)) goto err_add_rule; else - esw->offloads.num_flows++; + atomic64_inc(&esw->offloads.num_flows); return rule; @@ -298,7 +298,7 @@ mlx5_eswitch_add_fwd_rule(struct mlx5_eswitch *esw, if (IS_ERR(rule)) goto add_err; - esw->offloads.num_flows++; + atomic64_inc(&esw->offloads.num_flows); return rule; add_err: @@ -326,7 +326,7 @@ __mlx5_eswitch_del_rule(struct mlx5_eswitch *esw, mlx5_eswitch_termtbl_put(esw, attr->dests[i].termtbl); } - esw->offloads.num_flows--; + atomic64_dec(&esw->offloads.num_flows); if (fwd_rule) { esw_put_prio_table(esw, attr->chain, attr->prio, 1); @@ -2349,7 +2349,7 @@ int mlx5_devlink_eswitch_inline_mode_set(struct devlink *devlink, u8 mode, break; } - if (esw->offloads.num_flows > 0) { + if (atomic64_read(&esw->offloads.num_flows) > 0) { NL_SET_ERR_MSG_MOD(extack, "Can't set inline mode when flows are configured"); return -EOPNOTSUPP; @@ -2459,7 +2459,7 @@ int mlx5_devlink_eswitch_encap_mode_set(struct devlink *devlink, if (esw->offloads.encap == encap) return 0; - if (esw->offloads.num_flows > 0) { + if (atomic64_read(&esw->offloads.num_flows) > 0) { NL_SET_ERR_MSG_MOD(extack, "Can't set encapsulation when flows are configured"); return -EOPNOTSUPP; |