From: Jisheng Zhang jszhang@kernel.org
[ Upstream commit 18da174d865a87d47d2f33f5b0a322efcf067728 ]
Implement 64 bit per cpu stats to fix the overflow of netdev->stats on 32 bit platforms. To simplify the code, we use net core pcpu_sw_netstats infrastructure. One small drawback is some memory overhead because litex uses just one queue, but we allocate the counters per cpu.
Signed-off-by: Jisheng Zhang jszhang@kernel.org Reviewed-by: Simon Horman simon.horman@corigine.com Acked-by: Gabriel Somlo gsomlo@gmail.com Link: https://lore.kernel.org/r/20230614162035.300-1-jszhang@kernel.org Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/litex/litex_liteeth.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/litex/litex_liteeth.c b/drivers/net/ethernet/litex/litex_liteeth.c index 35f24e0f09349..ffa96059079c6 100644 --- a/drivers/net/ethernet/litex/litex_liteeth.c +++ b/drivers/net/ethernet/litex/litex_liteeth.c @@ -78,8 +78,7 @@ static int liteeth_rx(struct net_device *netdev) memcpy_fromio(data, priv->rx_base + rx_slot * priv->slot_size, len); skb->protocol = eth_type_trans(skb, netdev);
- netdev->stats.rx_packets++; - netdev->stats.rx_bytes += len; + dev_sw_netstats_rx_add(netdev, len);
return netif_rx(skb);
@@ -185,8 +184,7 @@ static netdev_tx_t liteeth_start_xmit(struct sk_buff *skb, litex_write16(priv->base + LITEETH_READER_LENGTH, skb->len); litex_write8(priv->base + LITEETH_READER_START, 1);
- netdev->stats.tx_bytes += skb->len; - netdev->stats.tx_packets++; + dev_sw_netstats_tx_add(netdev, 1, skb->len);
priv->tx_slot = (priv->tx_slot + 1) % priv->num_tx_slots; dev_kfree_skb_any(skb); @@ -194,9 +192,17 @@ static netdev_tx_t liteeth_start_xmit(struct sk_buff *skb, return NETDEV_TX_OK; }
+static void +liteeth_get_stats64(struct net_device *netdev, struct rtnl_link_stats64 *stats) +{ + netdev_stats_to_stats64(stats, &netdev->stats); + dev_fetch_sw_netstats(stats, netdev->tstats); +} + static const struct net_device_ops liteeth_netdev_ops = { .ndo_open = liteeth_open, .ndo_stop = liteeth_stop, + .ndo_get_stats64 = liteeth_get_stats64, .ndo_start_xmit = liteeth_start_xmit, };
@@ -242,6 +248,11 @@ static int liteeth_probe(struct platform_device *pdev) priv->netdev = netdev; priv->dev = &pdev->dev;
+ netdev->tstats = devm_netdev_alloc_pcpu_stats(&pdev->dev, + struct pcpu_sw_netstats); + if (!netdev->tstats) + return -ENOMEM; + irq = platform_get_irq(pdev, 0); if (irq < 0) return irq;