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net: ethernet: litex: add support for 64 bit stats

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[ Upstream commit 18da174d86 ]

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>
This commit is contained in:
Jisheng Zhang 2023-06-15 00:20:35 +08:00 committed by Greg Kroah-Hartman
parent 133b1cd4d9
commit 46393b829d
1 changed files with 15 additions and 4 deletions
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19
drivers/net/ethernet/litex/litex_liteeth.c
View file

@ -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;