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Date: Sat, 15 Jul 2017 17:14:39 +0100
From: kiki good <jqiaoulk@...il.com>
To: f.fainelli@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH] Broadcom Sysport: Support 64bit net status report on
32bit Platform
When using Broadcom Sysport device in 32bit Platform, ifconfig can
only report up to 4G
tx,rx status, which will be wrapped to 0 when the number of incoming or outgoing
packets exceeds 4G.
The patch is used to add 64bit support for Broadcom Sysport device in
32bit Platform.
On Sat, Jul 15, 2017 at 5:11 PM, kiki good <jqiaoulk@...il.com> wrote:
> Signed-off-by: Jianming Qiao <kiki-good@...mail.com>
> ---
> drivers/net/ethernet/broadcom/bcmsysport.c | 81
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------------------
> drivers/net/ethernet/broadcom/bcmsysport.h | 8 ++++++++
> 2 files changed, 68 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c
> b/drivers/net/ethernet/broadcom/bcmsysport.c
> index 5274501..263512f 100644
> --- a/drivers/net/ethernet/broadcom/bcmsysport.c
> +++ b/drivers/net/ethernet/broadcom/bcmsysport.c
> @@ -663,6 +663,7 @@ static unsigned int bcm_sysport_desc_rx(struct
> bcm_sysport_priv *priv,
> unsigned int budget)
> {
> struct net_device *ndev = priv->netdev;
> + struct bcmsysport_netstats *bsysport_netstats = priv->bsysport_netstats;
> unsigned int processed = 0, to_process;
> struct bcm_sysport_cb *cb;
> struct sk_buff *skb;
> @@ -763,8 +764,10 @@ static unsigned int bcm_sysport_desc_rx(struct
> bcm_sysport_priv *priv,
> }
>
> skb->protocol = eth_type_trans(skb, ndev);
> - ndev->stats.rx_packets++;
> - ndev->stats.rx_bytes += len;
> + u64_stats_update_begin(&bsysport_netstats->syncp);
> + bsysport_netstats->rx_packets++;
> + bsysport_netstats->rx_bytes += len;
> + u64_stats_update_end(&bsysport_netstats->syncp);
>
> napi_gro_receive(&priv->napi, skb);
> next:
> @@ -785,19 +788,26 @@ static void bcm_sysport_tx_reclaim_one(struct
> bcm_sysport_tx_ring *ring,
> {
> struct bcm_sysport_priv *priv = ring->priv;
> struct device *kdev = &priv->pdev->dev;
> + struct bcmsysport_netstats *bsysport_netstats = priv->bsysport_netstats;
>
> if (cb->skb) {
> + u64_stats_update_begin(&bsysport_netstats->syncp);
> ring->bytes += cb->skb->len;
> + u64_stats_update_end(&bsysport_netstats->syncp);
> *bytes_compl += cb->skb->len;
> dma_unmap_single(kdev, dma_unmap_addr(cb, dma_addr),
> dma_unmap_len(cb, dma_len),
> DMA_TO_DEVICE);
> + u64_stats_update_begin(&bsysport_netstats->syncp);
> ring->packets++;
> + u64_stats_update_end(&bsysport_netstats->syncp);
> (*pkts_compl)++;
> bcm_sysport_free_cb(cb);
> /* SKB fragment */
> } else if (dma_unmap_addr(cb, dma_addr)) {
> + u64_stats_update_begin(&bsysport_netstats->syncp);
> ring->bytes += dma_unmap_len(cb, dma_len);
> + u64_stats_update_end(&bsysport_netstats->syncp);
> dma_unmap_page(kdev, dma_unmap_addr(cb, dma_addr),
> dma_unmap_len(cb, dma_len), DMA_TO_DEVICE);
> dma_unmap_addr_set(cb, dma_addr, 0);
> @@ -1671,23 +1681,6 @@ static int bcm_sysport_change_mac(struct
> net_device *dev, void *p)
> return 0;
> }
>
> -static struct net_device_stats *bcm_sysport_get_nstats(struct net_device *dev)
> -{
> - struct bcm_sysport_priv *priv = netdev_priv(dev);
> - unsigned long tx_bytes = 0, tx_packets = 0;
> - struct bcm_sysport_tx_ring *ring;
> - unsigned int q;
> -
> - for (q = 0; q < dev->num_tx_queues; q++) {
> - ring = &priv->tx_rings[q];
> - tx_bytes += ring->bytes;
> - tx_packets += ring->packets;
> - }
> -
> - dev->stats.tx_bytes = tx_bytes;
> - dev->stats.tx_packets = tx_packets;
> - return &dev->stats;
> -}
>
> static void bcm_sysport_netif_start(struct net_device *dev)
> {
> @@ -1923,6 +1916,49 @@ static int bcm_sysport_stop(struct net_device *dev)
> return 0;
> }
>
> +static int bcm_sysport_init(struct net_device *dev)
> +{
> + struct bcm_sysport_priv *priv = netdev_priv(dev);
> +
> + priv->bsysport_netstats = kzalloc(sizeof(*priv->bsysport_netstats),
> + GFP_KERNEL);
> + if (!priv->bsysport_netstats)
> + return -ENOMEM;
> +
> + return 0;
> +}
> +
> +static void bcm_sysport_get_stats64(struct net_device *dev,
> + struct rtnl_link_stats64 *stats)
> +{
> + struct bcm_sysport_priv *priv = netdev_priv(dev);
> + struct bcmsysport_netstats *bsysport_netstats = priv->bsysport_netstats;
> + struct bcm_sysport_tx_ring *ring;
> + unsigned int q;
> + u64 tx_packets = 0, tx_bytes = 0;
> + unsigned int start;
> +
> + netdev_stats_to_stats64(stats, &dev->stats);
> +
> + for (q = 0; q < dev->num_tx_queues; q++) {
> + ring = &priv->tx_rings[q];
> + do {
> + start =
> u64_stats_fetch_begin_irq(&bsysport_netstats->syncp);
> + tx_bytes += ring->bytes;
> + tx_packets += ring->packets;
> + } while
> (u64_stats_fetch_retry_irq(&bsysport_netstats->syncp, start));
> + }
> +
> + stats->tx_packets = tx_packets;
> + stats->tx_bytes = tx_bytes;
> +
> + do {
> + start = u64_stats_fetch_begin_irq(&bsysport_netstats->syncp);
> + stats->rx_packets = bsysport_netstats->rx_packets;
> + stats->rx_bytes = bsysport_netstats->rx_bytes;
> + } while (u64_stats_fetch_retry_irq(&bsysport_netstats->syncp, start));
> +}
> +
> static const struct ethtool_ops bcm_sysport_ethtool_ops = {
> .get_drvinfo = bcm_sysport_get_drvinfo,
> .get_msglevel = bcm_sysport_get_msglvl,
> @@ -1942,6 +1978,7 @@ static int bcm_sysport_stop(struct net_device *dev)
> static const struct net_device_ops bcm_sysport_netdev_ops = {
> .ndo_start_xmit = bcm_sysport_xmit,
> .ndo_tx_timeout = bcm_sysport_tx_timeout,
> + .ndo_init = bcm_sysport_init,
> .ndo_open = bcm_sysport_open,
> .ndo_stop = bcm_sysport_stop,
> .ndo_set_features = bcm_sysport_set_features,
> @@ -1950,7 +1987,7 @@ static int bcm_sysport_stop(struct net_device *dev)
> #ifdef CONFIG_NET_POLL_CONTROLLER
> .ndo_poll_controller = bcm_sysport_poll_controller,
> #endif
> - .ndo_get_stats = bcm_sysport_get_nstats,
> + .ndo_get_stats64 = bcm_sysport_get_stats64,
> };
>
> #define REV_FMT "v%2x.%02x"
> @@ -2126,10 +2163,12 @@ static int bcm_sysport_remove(struct
> platform_device *pdev)
> {
> struct net_device *dev = dev_get_drvdata(&pdev->dev);
> struct device_node *dn = pdev->dev.of_node;
> -
> + struct bcm_sysport_priv *priv = netdev_priv(dev);
> /* Not much to do, ndo_close has been called
> * and we use managed allocations
> */
> + kfree(priv->bsysport_netstats);
> + priv->bsysport_netstats = NULL;
> unregister_netdev(dev);
> if (of_phy_is_fixed_link(dn))
> of_phy_deregister_fixed_link(dn);
> diff --git a/drivers/net/ethernet/broadcom/bcmsysport.h
> b/drivers/net/ethernet/broadcom/bcmsysport.h
> index 77a51c1..29a7442 100644
> --- a/drivers/net/ethernet/broadcom/bcmsysport.h
> +++ b/drivers/net/ethernet/broadcom/bcmsysport.h
> @@ -697,6 +697,12 @@ struct bcm_sysport_tx_ring {
> unsigned long bytes; /* bytes statistics */
> };
>
> +struct bcmsysport_netstats {
> + u64 rx_packets;
> + u64 rx_bytes;
> + struct u64_stats_sync syncp;
> +};
> +
> /* Driver private structure */
> struct bcm_sysport_priv {
> void __iomem *base;
> @@ -743,5 +749,7 @@ struct bcm_sysport_priv {
>
> /* Ethtool */
> u32 msg_enable;
> + /* 64bit stats on 32bit Machine */
> + struct bcmsysport_netstats *bsysport_netstats;
> };
> #endif /* __BCM_SYSPORT_H */
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