netdev - [PATCH 2/2 net-next v2] igb: refactor XDP registration

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Date:   Fri, 14 Jan 2022 12:43:54 +0100
From:   Corinna Vinschen <vinschen@...hat.com>
To:     intel-wired-lan@...osl.org, netdev@...r.kernel.org,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>
Cc:     Lennert Buytenhek <buytenh@...tstofly.org>,
        Alexander Lobakin <alexandr.lobakin@...el.com>
Subject: [PATCH 2/2 net-next v2] igb: refactor XDP registration

On changing the RX ring parameters igb uses a hack to avoid a warning
when calling xdp_rxq_info_reg via igb_setup_rx_resources.  It just
clears the struct xdp_rxq_info content.

Change this to unregister if we're already registered instead.  ALign
code to the igc code.

Fixes: 9cbc948b5a20c ("igb: add XDP support")
Signed-off-by: Corinna Vinschen <vinschen@...hat.com>
---
 drivers/net/ethernet/intel/igb/igb_ethtool.c |  4 ----
 drivers/net/ethernet/intel/igb/igb_main.c    | 15 +++++++++++----
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_ethtool.c b/drivers/net/ethernet/intel/igb/igb_ethtool.c
index 51a2dcaf553d..2a5782063f4c 100644
--- a/drivers/net/ethernet/intel/igb/igb_ethtool.c
+++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c
@@ -965,10 +965,6 @@ static int igb_set_ringparam(struct net_device *netdev,
 			memcpy(&temp_ring[i], adapter->rx_ring[i],
 			       sizeof(struct igb_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 = igb_setup_rx_resources(&temp_ring[i]);
 			if (err) {
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 38ba92022cd4..9638cb9c6014 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -4352,7 +4352,7 @@ int igb_setup_rx_resources(struct igb_ring *rx_ring)
 {
 	struct igb_adapter *adapter = netdev_priv(rx_ring->netdev);
 	struct device *dev = rx_ring->dev;
-	int size;
+	int size, res;
 
 	size = sizeof(struct igb_rx_buffer) * rx_ring->count;
 
@@ -4376,9 +4376,16 @@ int igb_setup_rx_resources(struct igb_ring *rx_ring)
 	rx_ring->xdp_prog = adapter->xdp_prog;
 
 	/* XDP RX-queue info */
-	if (xdp_rxq_info_reg(&rx_ring->xdp_rxq, rx_ring->netdev,
-			     rx_ring->queue_index, 0) < 0)
-		goto err;
+	if (xdp_rxq_info_is_reg(&rx_ring->xdp_rxq))
+		xdp_rxq_info_unreg(&rx_ring->xdp_rxq);
+	res = xdp_rxq_info_reg(&rx_ring->xdp_rxq, rx_ring->netdev,
+			       rx_ring->queue_index, 0);
+	if (res < 0) {
+		netdev_err(rx_ring->netdev,
+			   "Failed to register xdp_rxq index %u\n",
+			   rx_ring->queue_index);
+		return res;
+	}
 
 	return 0;
 
-- 
2.27.0