[PATCH net] veth: fix ethtool statistical errors

[Albert Huang]

if peer->real_num_rx_queues > 1, the ethtool -s command for
veth network device will display some error statistical values.
The value of tx_idx is reset with each iteration, so even if
peer->real_num_rx_queues is greater than 1, the value of tx_idx
will remain constant. This results in incorrect statistical values.
To fix this issue, assign the value of pp_idx to tx_idx.

Fixes: 5fe6e56776ba ("veth: rely on peer veth_rq for ndo_xdp_xmit accounting")
Signed-off-by: Albert Huang <huangjie.albert@xxxxxxxxxxxxx>
---
 drivers/net/veth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 0deefd1573cf..3a8e3fc5eeb5 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -225,7 +225,7 @@ static void veth_get_ethtool_stats(struct net_device *dev,
 	for (i = 0; i < peer->real_num_rx_queues; i++) {
 		const struct veth_rq_stats *rq_stats = &rcv_priv->rq[i].stats;
 		const void *base = (void *)&rq_stats->vs;
-		unsigned int start, tx_idx = idx;
+		unsigned int start, tx_idx = pp_idx;
 		size_t offset;
 
 		tx_idx += (i % dev->real_num_tx_queues) * VETH_TQ_STATS_LEN;
-- 
2.20.1