net/mlx5e: IPoIB, Use priv stats in completion rx flow

mainline inclusion
from mainline-4.20
commit 19052a3b7710
category: bugfix
bugzilla: 6099
CVE: NA

-------------------------------------------------

Since the RQs are shared between all pkey interfaces, the stats
should be taken from where the per-ring stats are stored instead
of the parent RQ.

Fixes: 4c6c615e ("net/mlx5e: IPoIB, Add PKEY child interface nic profile")
Signed-off-by: NFeras Daoud <ferasda@mellanox.com>
Signed-off-by: NSaeed Mahameed <saeedm@mellanox.com>
Signed-off-by: NTariq Toukan <tariqt@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NKeefe LIU <liuqifa@huawei.com>
Reviewed-by: NWei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/net/ethernet/mellanox/mlx5/core/en_rx.c

@@ -1259,8 +1259,8 @@ static inline void mlx5i_complete_rx_cqe(struct mlx5e_rq *rq,
 					 u32 cqe_bcnt,
 					 struct sk_buff *skb)
 {
-	struct mlx5e_rq_stats *stats = rq->stats;
 	struct hwtstamp_config *tstamp;
+	struct mlx5e_rq_stats *stats;
 	struct net_device *netdev;
 	struct mlx5e_priv *priv;
 	char *pseudo_header;
@@ -1283,6 +1283,7 @@ static inline void mlx5i_complete_rx_cqe(struct mlx5e_rq *rq,
 
 	priv = mlx5i_epriv(netdev);
 	tstamp = &priv->tstamp;
+	stats = &priv->channel_stats[rq->ix].rq;
 
 	g = (be32_to_cpu(cqe->flags_rqpn) >> 28) & 3;
 	dgid = skb->data + MLX5_IB_GRH_DGID_OFFSET;