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Date:   Thu,  6 Feb 2020 10:14:39 +0100
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     netdev@...r.kernel.org
Cc:     lorenzo.bianconi@...hat.com, davem@...emloft.net,
        ilias.apalodimas@...aro.org, brouer@...hat.com
Subject: [PATCH net] net: mvneta: move rx_dropped and rx_errors in per-cpu stats

Move rx_dropped and rx_errors counters in mvneta_pcpu_stats in order to
avoid possible races updating statistics

Fixes: 562e2f467e71 ("net: mvneta: Improve the buffer allocation method for SWBM")
Fixes: dc35a10f68d3 ("net: mvneta: bm: add support for hardware buffer management")
Fixes: c5aff18204da ("net: mvneta: driver for Marvell Armada 370/XP network unit")
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 drivers/net/ethernet/marvell/mvneta.c | 31 +++++++++++++++++++--------
 1 file changed, 22 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 037e054b01a2..98017e7d5dd0 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -401,6 +401,8 @@ struct mvneta_pcpu_stats {
 	struct	u64_stats_sync syncp;
 	u64	rx_packets;
 	u64	rx_bytes;
+	u64	rx_dropped;
+	u64	rx_errors;
 	u64	tx_packets;
 	u64	tx_bytes;
 };
@@ -738,6 +740,8 @@ mvneta_get_stats64(struct net_device *dev,
 		struct mvneta_pcpu_stats *cpu_stats;
 		u64 rx_packets;
 		u64 rx_bytes;
+		u64 rx_dropped;
+		u64 rx_errors;
 		u64 tx_packets;
 		u64 tx_bytes;
 
@@ -746,19 +750,20 @@ mvneta_get_stats64(struct net_device *dev,
 			start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
 			rx_packets = cpu_stats->rx_packets;
 			rx_bytes   = cpu_stats->rx_bytes;
+			rx_dropped = cpu_stats->rx_dropped;
+			rx_errors  = cpu_stats->rx_errors;
 			tx_packets = cpu_stats->tx_packets;
 			tx_bytes   = cpu_stats->tx_bytes;
 		} while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
 
 		stats->rx_packets += rx_packets;
 		stats->rx_bytes   += rx_bytes;
+		stats->rx_dropped += rx_dropped;
+		stats->rx_errors  += rx_errors;
 		stats->tx_packets += tx_packets;
 		stats->tx_bytes   += tx_bytes;
 	}
 
-	stats->rx_errors	= dev->stats.rx_errors;
-	stats->rx_dropped	= dev->stats.rx_dropped;
-
 	stats->tx_dropped	= dev->stats.tx_dropped;
 }
 
@@ -1736,8 +1741,14 @@ static u32 mvneta_txq_desc_csum(int l3_offs, int l3_proto,
 static void mvneta_rx_error(struct mvneta_port *pp,
 			    struct mvneta_rx_desc *rx_desc)
 {
+	struct mvneta_pcpu_stats *stats = this_cpu_ptr(pp->stats);
 	u32 status = rx_desc->status;
 
+	/* update per-cpu counter */
+	u64_stats_update_begin(&stats->syncp);
+	stats->rx_errors++;
+	u64_stats_update_end(&stats->syncp);
+
 	switch (status & MVNETA_RXD_ERR_CODE_MASK) {
 	case MVNETA_RXD_ERR_CRC:
 		netdev_err(pp->dev, "bad rx status %08x (crc error), size=%d\n",
@@ -2179,11 +2190,15 @@ mvneta_swbm_rx_frame(struct mvneta_port *pp,
 
 	rxq->skb = build_skb(xdp->data_hard_start, PAGE_SIZE);
 	if (unlikely(!rxq->skb)) {
-		netdev_err(dev,
-			   "Can't allocate skb on queue %d\n",
-			   rxq->id);
-		dev->stats.rx_dropped++;
+		struct mvneta_pcpu_stats *stats = this_cpu_ptr(pp->stats);
+
+		netdev_err(dev, "Can't allocate skb on queue %d\n", rxq->id);
 		rxq->skb_alloc_err++;
+
+		u64_stats_update_begin(&stats->syncp);
+		stats->rx_dropped++;
+		u64_stats_update_end(&stats->syncp);
+
 		return -ENOMEM;
 	}
 	page_pool_release_page(rxq->page_pool, page);
@@ -2270,7 +2285,6 @@ static int mvneta_rx_swbm(struct napi_struct *napi,
 			/* Check errors only for FIRST descriptor */
 			if (rx_status & MVNETA_RXD_ERR_SUMMARY) {
 				mvneta_rx_error(pp, rx_desc);
-				dev->stats.rx_errors++;
 				/* leave the descriptor untouched */
 				continue;
 			}
@@ -2372,7 +2386,6 @@ static int mvneta_rx_hwbm(struct napi_struct *napi,
 			mvneta_bm_pool_put_bp(pp->bm_priv, bm_pool,
 					      rx_desc->buf_phys_addr);
 err_drop_frame:
-			dev->stats.rx_errors++;
 			mvneta_rx_error(pp, rx_desc);
 			/* leave the descriptor untouched */
 			continue;
-- 
2.21.1

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