From: Maxim Mikityanskiy <maximmi@xxxxxxxxxxxx>
commit e7e0004abdd6f83ae4be5613b29ed396beff576c upstream.
XSK wakeup function triggers NAPI by posting a NOP WQE to a special XSK
ICOSQ. When the application floods the driver with wakeup requests by
calling sendto() in a certain pattern that ends up in mlx5e_trigger_irq,
the XSK ICOSQ may overflow.
Multiple NOPs are not required and won't accelerate the process, so
avoid posting a second NOP if there is one already on the way. This way
we also avoid increasing the queue size (which might not help anyway).
Fixes: db05815b36cb ("net/mlx5e: Add XSK zero-copy support")
Signed-off-by: Maxim Mikityanskiy <maximmi@xxxxxxxxxxxx>
Reviewed-by: Tariq Toukan <tariqt@xxxxxxxxxxxx>
Signed-off-by: Saeed Mahameed <saeedm@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/mellanox/mlx5/core/en.h | 3 ++-
drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c | 3 +++
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 8 +++++---
drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c | 6 +++++-
4 files changed, 15 insertions(+), 5 deletions(-)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -367,6 +367,7 @@ enum {
MLX5E_SQ_STATE_AM,
MLX5E_SQ_STATE_TLS,
MLX5E_SQ_STATE_VLAN_NEED_L2_INLINE,
+ MLX5E_SQ_STATE_PENDING_XSK_TX,
};
struct mlx5e_sq_wqe_info {
@@ -948,7 +949,7 @@ void mlx5e_page_release_dynamic(struct m
void mlx5e_handle_rx_cqe(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe);
void mlx5e_handle_rx_cqe_mpwrq(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe);
bool mlx5e_post_rx_wqes(struct mlx5e_rq *rq);
-void mlx5e_poll_ico_cq(struct mlx5e_cq *cq);
+int mlx5e_poll_ico_cq(struct mlx5e_cq *cq);
bool mlx5e_post_rx_mpwqes(struct mlx5e_rq *rq);
void mlx5e_dealloc_rx_wqe(struct mlx5e_rq *rq, u16 ix);
void mlx5e_dealloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix);
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c
@@ -33,6 +33,9 @@ int mlx5e_xsk_wakeup(struct net_device *
if (unlikely(!test_bit(MLX5E_SQ_STATE_ENABLED, &c->xskicosq.state)))
return 0;
+ if (test_and_set_bit(MLX5E_SQ_STATE_PENDING_XSK_TX, &c->xskicosq.state))
+ return 0;
+
spin_lock(&c->xskicosq_lock);
mlx5e_trigger_irq(&c->xskicosq);
spin_unlock(&c->xskicosq_lock);
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -587,7 +587,7 @@ bool mlx5e_post_rx_wqes(struct mlx5e_rq
return !!err;
}
-void mlx5e_poll_ico_cq(struct mlx5e_cq *cq)
+int mlx5e_poll_ico_cq(struct mlx5e_cq *cq)
{
struct mlx5e_icosq *sq = container_of(cq, struct mlx5e_icosq, cq);
struct mlx5_cqe64 *cqe;
@@ -595,11 +595,11 @@ void mlx5e_poll_ico_cq(struct mlx5e_cq *
int i;
if (unlikely(!test_bit(MLX5E_SQ_STATE_ENABLED, &sq->state)))
- return;
+ return 0;
cqe = mlx5_cqwq_get_cqe(&cq->wq);
if (likely(!cqe))
- return;
+ return 0;
/* sq->cc must be updated only after mlx5_cqwq_update_db_record(),
* otherwise a cq overrun may occur
@@ -646,6 +646,8 @@ void mlx5e_poll_ico_cq(struct mlx5e_cq *
sq->cc = sqcc;
mlx5_cqwq_update_db_record(&cq->wq);
+
+ return i;
}
bool mlx5e_post_rx_mpwqes(struct mlx5e_rq *rq)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c
@@ -145,7 +145,11 @@ int mlx5e_napi_poll(struct napi_struct *
busy |= rq->post_wqes(rq);
if (xsk_open) {
- mlx5e_poll_ico_cq(&c->xskicosq.cq);
+ if (mlx5e_poll_ico_cq(&c->xskicosq.cq))
+ /* Don't clear the flag if nothing was polled to prevent
+ * queueing more WQEs and overflowing XSKICOSQ.
+ */
+ clear_bit(MLX5E_SQ_STATE_PENDING_XSK_TX, &c->xskicosq.state);
busy |= mlx5e_poll_xdpsq_cq(&xsksq->cq);
busy_xsk |= mlx5e_napi_xsk_post(xsksq, xskrq);
}
