linux-kernel - [PATCH 5.11 110/254] veth: Store queue_mapping independently of XDP prog presence

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Date:   Mon, 29 Mar 2021 09:57:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Toshiaki Makita <toshiaki.makita1@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 110/254] veth: Store queue_mapping independently of XDP prog presence

From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>

[ Upstream commit edbea922025169c0e5cdca5ebf7bf5374cc5566c ]

Currently, veth_xmit() would call the skb_record_rx_queue() only when
there is XDP program loaded on peer interface in native mode.

If peer has XDP prog in generic mode, then netif_receive_generic_xdp()
has a call to netif_get_rxqueue(skb), so for multi-queue veth it will
not be possible to grab a correct rxq.

To fix that, store queue_mapping independently of XDP prog presence on
peer interface.

Fixes: 638264dc9022 ("veth: Support per queue XDP ring")
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Acked-by: Toshiaki Makita <toshiaki.makita1@...il.com>
Link: https://lore.kernel.org/bpf/20210303152903.11172-1-maciej.fijalkowski@intel.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/veth.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 02bfcdf50a7a..36abe756282e 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -301,8 +301,7 @@ static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
 	if (rxq < rcv->real_num_rx_queues) {
 		rq = &rcv_priv->rq[rxq];
 		rcv_xdp = rcu_access_pointer(rq->xdp_prog);
-		if (rcv_xdp)
-			skb_record_rx_queue(skb, rxq);
+		skb_record_rx_queue(skb, rxq);
 	}
 
 	skb_tx_timestamp(skb);
-- 
2.30.1