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net/mlx5e: Replace synchronize_rcu with synchronize_net

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[ Upstream commit 4d6e6b0c6d ]

The commit cited below switched from using napi_synchronize to
synchronize_rcu to have a guarantee that it will finish in finite time.
However, on average, synchronize_rcu takes more time than
napi_synchronize. Given that it's called multiple times per channel on
deactivation, it accumulates to a significant amount, which causes
timeouts in some applications (for example, when using bonding with
NetworkManager).

This commit replaces synchronize_rcu with synchronize_net, which is
faster when called under rtnl_lock, allowing to speed up the described
flow.

Fixes: 9c25a22dfb ("net/mlx5e: Use synchronize_rcu to sync with NAPI")
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maxim Mikityanskiy
2021-02-01 14:01:27 +02:00
committed by Greg Kroah-Hartman
parent 27c79b3a92
commit 08b42b6f89
4 changed files with 7 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
View File

@@ -83,7 +83,7 @@ static inline void mlx5e_xdp_tx_disable(struct mlx5e_priv *priv)
clear_bit(MLX5E_STATE_XDP_TX_ENABLED, &priv->state);
/* Let other device's napi(s) and XSK wakeups see our new state. */
synchronize_rcu();
synchronize_net();
}
static inline bool mlx5e_xdp_tx_is_enabled(struct mlx5e_priv *priv)

2
drivers/net/ethernet/mellanox/mlx5/core/en/xsk/setup.c
View File

@@ -106,7 +106,7 @@ err_free_cparam:
void mlx5e_close_xsk(struct mlx5e_channel *c)
{
clear_bit(MLX5E_CHANNEL_STATE_XSK, c->state);
synchronize_rcu(); /* Sync with the XSK wakeup and with NAPI. */
synchronize_net(); /* Sync with the XSK wakeup and with NAPI. */
mlx5e_close_rq(&c->xskrq);
mlx5e_close_cq(&c->xskrq.cq);

2
drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_rx.c
View File

@@ -663,7 +663,7 @@ void mlx5e_ktls_del_rx(struct net_device *netdev, struct tls_context *tls_ctx)
priv_rx = mlx5e_get_ktls_rx_priv_ctx(tls_ctx);
set_bit(MLX5E_PRIV_RX_FLAG_DELETING, priv_rx->flags);
mlx5e_set_ktls_rx_priv_ctx(tls_ctx, NULL);
synchronize_rcu(); /* Sync with NAPI */
synchronize_net(); /* Sync with NAPI */
if (!cancel_work_sync(&priv_rx->rule.work))
/* completion is needed, as the priv_rx in the add flow
* is maintained on the wqe info (wi), not on the socket.

8
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
View File

@@ -919,7 +919,7 @@ void mlx5e_activate_rq(struct mlx5e_rq *rq)
void mlx5e_deactivate_rq(struct mlx5e_rq *rq)
{
clear_bit(MLX5E_RQ_STATE_ENABLED, &rq->state);
synchronize_rcu(); /* Sync with NAPI to prevent mlx5e_post_rx_wqes. */
synchronize_net(); /* Sync with NAPI to prevent mlx5e_post_rx_wqes. */
}
void mlx5e_close_rq(struct mlx5e_rq *rq)
@@ -1380,7 +1380,7 @@ static void mlx5e_deactivate_txqsq(struct mlx5e_txqsq *sq)
struct mlx5_wq_cyc *wq = &sq->wq;
clear_bit(MLX5E_SQ_STATE_ENABLED, &sq->state);
synchronize_rcu(); /* Sync with NAPI to prevent netif_tx_wake_queue. */
synchronize_net(); /* Sync with NAPI to prevent netif_tx_wake_queue. */
mlx5e_tx_disable_queue(sq->txq);
@@ -1456,7 +1456,7 @@ void mlx5e_activate_icosq(struct mlx5e_icosq *icosq)
void mlx5e_deactivate_icosq(struct mlx5e_icosq *icosq)
{
clear_bit(MLX5E_SQ_STATE_ENABLED, &icosq->state);
synchronize_rcu(); /* Sync with NAPI. */
synchronize_net(); /* Sync with NAPI. */
}
void mlx5e_close_icosq(struct mlx5e_icosq *sq)
@@ -1535,7 +1535,7 @@ void mlx5e_close_xdpsq(struct mlx5e_xdpsq *sq)
struct mlx5e_channel *c = sq->channel;
clear_bit(MLX5E_SQ_STATE_ENABLED, &sq->state);
synchronize_rcu(); /* Sync with NAPI. */
synchronize_net(); /* Sync with NAPI. */
mlx5e_destroy_sq(c->mdev, sq->sqn);
mlx5e_free_xdpsq_descs(sq);