netdev - [PATCH net v2 1/3] net: ena: Flush XDP packets on error.

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Message-Id: <20230918153611.165722-2-bigeasy@linutronix.de>
Date: Mon, 18 Sep 2023 17:36:09 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: netdev@...r.kernel.org,
	bpf@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Arthur Kiyanovski <akiyano@...zon.com>,
	David Arinzon <darinzon@...zon.com>,
	Noam Dagan <ndagan@...zon.com>,
	Saeed Bishara <saeedb@...zon.com>,
	Shay Agroskin <shayagr@...zon.com>
Subject: [PATCH net v2 1/3] net: ena: Flush XDP packets on error.

xdp_do_flush() should be invoked before leaving the NAPI poll function
after a XDP-redirect. This is not the case if the driver leaves via
the error path (after having a redirect in one of its previous
iterations).

Invoke xdp_do_flush() also in the error path.

Cc: Arthur Kiyanovski <akiyano@...zon.com>
Cc: David Arinzon <darinzon@...zon.com>
Cc: Noam Dagan <ndagan@...zon.com>
Cc: Saeed Bishara <saeedb@...zon.com>
Cc: Shay Agroskin <shayagr@...zon.com>
Fixes: a318c70ad152b ("net: ena: introduce XDP redirect implementation")
Acked-by: Arthur Kiyanovski <akiyano@...zon.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 drivers/net/ethernet/amazon/ena/ena_netdev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index ad32ca81f7ef4..f955bde10cf90 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -1833,6 +1833,9 @@ static int ena_clean_rx_irq(struct ena_ring *rx_ring, struct napi_struct *napi,
 	return work_done;
 
 error:
+	if (xdp_flags & ENA_XDP_REDIRECT)
+		xdp_do_flush();
+
 	adapter = netdev_priv(rx_ring->netdev);
 
 	if (rc == -ENOSPC) {
-- 
2.40.1