netdev - [PATCH net-next v2 2/4] eth: mlx4: don't try to complete XDP frames in netpoll

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Message-ID: <20250211192141.619024-3-kuba@kernel.org>
Date: Tue, 11 Feb 2025 11:21:39 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: tariqt@...dia.com,
	idosch@...sch.org,
	hawk@...nel.org,
	netdev@...r.kernel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	andrew+netdev@...n.ch,
	horms@...nel.org,
	Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next v2 2/4] eth: mlx4: don't try to complete XDP frames in netpoll

mlx4 doesn't support ndo_xdp_xmit / XDP_REDIRECT 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@...nel.org>
---
v2:
 - clarify the commit msg
v1: https://lore.kernel.org/20250205031213.358973-3-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