[PATCH net-next 2/4] eth: mlx4: don't try to complete XDP frames in netpoll

[Jakub Kicinski <kuba@kernel.org>]

mlx4 doesn't support xdp xmit and wasn't using page pool
until now, so it could run XDP completions in netpoll
(NAPI budget == 0) just fine. Page pool has calling
context requirements, make sure we don't try to call
it from what is potentially HW IRQ context.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/ethernet/mellanox/mlx4/en_tx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index 1ddb11cb25f9..6e077d202827 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -450,6 +450,8 @@ int mlx4_en_process_tx_cq(struct net_device *dev,
 
 	if (unlikely(!priv->port_up))
 		return 0;
+	if (unlikely(!napi_budget) && cq->type == TX_XDP)
+		return 0;
 
 	netdev_txq_bql_complete_prefetchw(ring->tx_queue);
 
-- 
2.48.1