netdev - [PATCH net-next] igc: avoid kernel warning when changing RX ring parameters

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Message-Id: <20220113160021.1027704-1-vinschen@redhat.com>
Date:   Thu, 13 Jan 2022 17:00:21 +0100
From:   Corinna Vinschen <vinschen@...hat.com>
To:     netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org
Cc:     Andre Guedes <andre.guedes@...el.com>,
        Sasha Neftin <sasha.neftin@...el.com>
Subject: [PATCH net-next] igc: avoid kernel warning when changing RX ring parameters

Calling ethtool changing the RX ring parameters like this:

  $ ethtool -G eth0 rx 1024

triggers the "Missing unregister, handled but fix driver" warning in
xdp_rxq_info_reg().

igc_ethtool_set_ringparam() copies the igc_ring structure but neglects to
reset the xdp_rxq_info member before calling igc_setup_rx_resources().
This in turn calls xdp_rxq_info_reg() with an already registered xdp_rxq_info.

This fix initializes the xdp_rxq_info member prior to calling
igc_setup_rx_resources(), exactly like igb.

Fixes: 73f1071c1d29 ("igc: Add support for XDP_TX action")
Signed-off-by: Corinna Vinschen <vinschen@...hat.com>
---
 drivers/net/ethernet/intel/igc/igc_ethtool.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/intel/igc/igc_ethtool.c b/drivers/net/ethernet/intel/igc/igc_ethtool.c
index 8cc077b712ad..93839106504d 100644
--- a/drivers/net/ethernet/intel/igc/igc_ethtool.c
+++ b/drivers/net/ethernet/intel/igc/igc_ethtool.c
@@ -671,6 +671,10 @@ igc_ethtool_set_ringparam(struct net_device *netdev,
 			memcpy(&temp_ring[i], adapter->rx_ring[i],
 			       sizeof(struct igc_ring));
 
+			/* Clear copied XDP RX-queue info */
+			memset(&temp_ring[i].xdp_rxq, 0,
+			       sizeof(temp_ring[i].xdp_rxq));
+
 			temp_ring[i].count = new_rx_count;
 			err = igc_setup_rx_resources(&temp_ring[i]);
 			if (err) {
-- 
2.27.0