idpf: Fix data race in idpf_net_dim

In idpf_net_dim(), some statistics protected by u64_stats_sync, are read
and accumulated in ignorance of possible u64_stats_fetch_retry() events.
The correct way to copy statistics is already illustrated by
idpf_add_queue_stats(). Fix this by reading them into temporary variables
first.

Fixes: c2d548c ("idpf: add TX splitq napi poll support")
Fixes: 3a8845a ("idpf: add RX splitq napi poll support")
Signed-off-by: David Yang <mmyangfl@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260119162720.1463859-1-mmyangfl@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: yangfl

drivers/net/ethernet/intel/idpf/idpf_txrx.c

@@ -3941,7 +3941,7 @@ static void idpf_update_dim_sample(struct idpf_q_vector *q_vector,
 static void idpf_net_dim(struct idpf_q_vector *q_vector)
 {
 	struct dim_sample dim_sample = { };
-	u64 packets, bytes;
+	u64 packets, bytes, pkts, bts;
 	u32 i;
 
 	if (!IDPF_ITR_IS_DYNAMIC(q_vector->tx_intr_mode))
@@ -3953,9 +3953,12 @@ static void idpf_net_dim(struct idpf_q_vector *q_vector)
 
 		do {
 			start = u64_stats_fetch_begin(&txq->stats_sync);
-			packets += u64_stats_read(&txq->q_stats.packets);
-			bytes += u64_stats_read(&txq->q_stats.bytes);
+			pkts = u64_stats_read(&txq->q_stats.packets);
+			bts = u64_stats_read(&txq->q_stats.bytes);
 		} while (u64_stats_fetch_retry(&txq->stats_sync, start));
+
+		packets += pkts;
+		bytes += bts;
 	}
 
 	idpf_update_dim_sample(q_vector, &dim_sample, &q_vector->tx_dim,
@@ -3972,9 +3975,12 @@ static void idpf_net_dim(struct idpf_q_vector *q_vector)
 
 		do {
 			start = u64_stats_fetch_begin(&rxq->stats_sync);
-			packets += u64_stats_read(&rxq->q_stats.packets);
-			bytes += u64_stats_read(&rxq->q_stats.bytes);
+			pkts = u64_stats_read(&rxq->q_stats.packets);
+			bts = u64_stats_read(&rxq->q_stats.bytes);
 		} while (u64_stats_fetch_retry(&rxq->stats_sync, start));
+
+		packets += pkts;
+		bytes += bts;
 	}
 
 	idpf_update_dim_sample(q_vector, &dim_sample, &q_vector->rx_dim,