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Date: Thu, 27 Jul 2017 17:55:58 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: "Jianming.qiao" <jqiaoulk@...il.com>, davem@...emloft.net,
netdev@...r.kernel.org
Subject: Re: [PATCH v4 net-next] net: systemport: Support 64bit statistics
On 07/27/2017 05:43 PM, Jianming.qiao wrote:
> When using Broadcom Systemport 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, only taking
> around 2 hours in busy network environment (such as streaming).
> Therefore, it makes hard for network diagnostic tool to get reliable
> statistical result, so the patch is used to add 64bit support for
> Broadcom Systemport device in 32bit Platform.
>
> Signed-off-by: Jianming.qiao <kiki-good@...mail.com>
> ---
> drivers/net/ethernet/broadcom/bcmsysport.c | 74 ++++++++++++++++++++----------
> drivers/net/ethernet/broadcom/bcmsysport.h | 9 +++-
> 2 files changed, 57 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
> index 5274501..16cd8a6 100644
> --- a/drivers/net/ethernet/broadcom/bcmsysport.c
> +++ b/drivers/net/ethernet/broadcom/bcmsysport.c
> @@ -662,6 +662,7 @@ static int bcm_sysport_alloc_rx_bufs(struct bcm_sysport_priv *priv)
> static unsigned int bcm_sysport_desc_rx(struct bcm_sysport_priv *priv,
> unsigned int budget)
> {
> + struct bcm_sysport_stats *stats64 = &priv->stats64;
> struct net_device *ndev = priv->netdev;
> unsigned int processed = 0, to_process;
> struct bcm_sysport_cb *cb;
> @@ -765,6 +766,10 @@ 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(&stats64->syncp);
> + stats64->rx_packets++;
> + stats64->rx_bytes += len;
> + u64_stats_update_end(&stats64->syncp);
>
> napi_gro_receive(&priv->napi, skb);
> next:
> @@ -784,24 +789,32 @@ static void bcm_sysport_tx_reclaim_one(struct bcm_sysport_tx_ring *ring,
> unsigned int *pkts_compl)
> {
> struct bcm_sysport_priv *priv = ring->priv;
> + struct bcm_sysport_stats *stats64 = &priv->stats64;
> struct device *kdev = &priv->pdev->dev;
> + unsigned int len = 0;
>
> if (cb->skb) {
> - ring->bytes += cb->skb->len;
> - *bytes_compl += cb->skb->len;
> + len = cb->skb->len;
> + *bytes_compl += len;
> dma_unmap_single(kdev, dma_unmap_addr(cb, dma_addr),
> dma_unmap_len(cb, dma_len),
> DMA_TO_DEVICE);
> - ring->packets++;
> (*pkts_compl)++;
> - bcm_sysport_free_cb(cb);
> /* SKB fragment */
> } else if (dma_unmap_addr(cb, dma_addr)) {
> - ring->bytes += dma_unmap_len(cb, dma_len);
> + len = dma_unmap_len(cb, dma_len);
> 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);
> }
> +
> + u64_stats_update_begin(&stats64->syncp);
> + ring->bytes += len;
> + if (cb->skb) {
> + ring->packets++;
> + bcm_sysport_free_cb(cb);
This does look better, but we should probably just call
bcm_sysport_free_cb() outside of the statistics update, so something
like this instead:
u64_stats_update_being(&stats64->syncp);
ring->bytes += len;
if (cb->skb)
ring->packets++;
u64_stats_update_end(&stats64->syncp);
if (cb->skb)
bcm_sysport_free_cb(cb);
Or maybe just do the 64-bit statistics update outside of
bcm_sysport_tx_reclaim_one() and do the following since for a given TX
clean run, we can't possibly be wrapping these two 32-bit counters
(pkts_compl and bytes_compl) since we have up to 1536 TX descriptors max
and if they were all 9000 bytes that would still be well within 4GB, so
something like this maybe:
diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c
b/drivers/net/ethernet/broadcom/bcmsysport.c
index 5333601f855f..c085deef61ee 100644
--- a/drivers/net/ethernet/broadcom/bcmsysport.c
+++ b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -787,17 +787,14 @@ static void bcm_sysport_tx_reclaim_one(struct
bcm_sysport_tx_ring *ring,
struct device *kdev = &priv->pdev->dev;
if (cb->skb) {
- ring->bytes += cb->skb->len;
*bytes_compl += cb->skb->len;
dma_unmap_single(kdev, dma_unmap_addr(cb, dma_addr),
dma_unmap_len(cb, dma_len),
DMA_TO_DEVICE);
- ring->packets++;
(*pkts_compl)++;
bcm_sysport_free_cb(cb);
/* SKB fragment */
} else if (dma_unmap_addr(cb, dma_addr)) {
- ring->bytes += dma_unmap_len(cb, dma_len);
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);
@@ -811,6 +808,7 @@ static unsigned int __bcm_sysport_tx_reclaim(struct
bcm_sysport_priv *priv,
struct net_device *ndev = priv->netdev;
unsigned int c_index, last_c_index, last_tx_cn, num_tx_cbs;
unsigned int pkts_compl = 0, bytes_compl = 0;
+ struct bcm_sysport_stats *stats64 = &priv->stats64;
struct bcm_sysport_cb *cb;
u32 hw_ind;
@@ -849,6 +847,11 @@ static unsigned int __bcm_sysport_tx_reclaim(struct
bcm_sysport_priv *priv,
last_c_index &= (num_tx_cbs - 1);
}
+ u64_stats_begin_update(&stats64->syncp);
+ ring->packets += pkts_compl;
+ ring->bytes += bytes_compl;
+ u64_stats_update_end(&stats64->syncp);
+
ring->c_index = c_index;
netif_dbg(priv, tx_done, ndev,
> + }
> + u64_stats_update_end(&stats64->syncp);
> }
>
> /* Reclaim queued SKBs for transmission completion, lockless version */
> @@ -1671,24 +1684,6 @@ 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)
> {
> struct bcm_sysport_priv *priv = netdev_priv(dev);
> @@ -1923,6 +1918,37 @@ static int bcm_sysport_stop(struct net_device *dev)
> 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 bcm_sysport_stats *stats64 = &priv->stats64;
> + struct bcm_sysport_tx_ring *ring;
> + u64 tx_packets = 0, tx_bytes = 0;
> + unsigned int start;
> + unsigned int q;
> +
> + 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(&stats64->syncp);
> + tx_bytes += ring->bytes;
> + tx_packets += ring->packets;
> + } while (u64_stats_fetch_retry_irq(&stats64->syncp, start));
> + }
> +
> + stats->tx_packets = tx_packets;
> + stats->tx_bytes = tx_bytes;
> +
> + do {
> + start = u64_stats_fetch_begin_irq(&stats64->syncp);
> + stats->rx_packets = stats64->rx_packets;
> + stats->rx_bytes = stats64->rx_bytes;
> + } while (u64_stats_fetch_retry_irq(&stats64->syncp, start));
> +}
> +
> static const struct ethtool_ops bcm_sysport_ethtool_ops = {
> .get_drvinfo = bcm_sysport_get_drvinfo,
> .get_msglevel = bcm_sysport_get_msglvl,
> @@ -1950,7 +1976,7 @@ 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"
> diff --git a/drivers/net/ethernet/broadcom/bcmsysport.h b/drivers/net/ethernet/broadcom/bcmsysport.h
> index 77a51c1..c03a176 100644
> --- a/drivers/net/ethernet/broadcom/bcmsysport.h
> +++ b/drivers/net/ethernet/broadcom/bcmsysport.h
> @@ -657,6 +657,9 @@ struct bcm_sysport_stats {
> enum bcm_sysport_stat_type type;
> /* reg offset from UMAC base for misc counters */
> u16 reg_offset;
> + u64 rx_packets;
> + u64 rx_bytes;
> + struct u64_stats_sync syncp;
> };
>
> /* Software house keeping helper structure */
> @@ -693,8 +696,8 @@ struct bcm_sysport_tx_ring {
> struct bcm_sysport_cb *cbs; /* Transmit control blocks */
> struct dma_desc *desc_cpu; /* CPU view of the descriptor */
> struct bcm_sysport_priv *priv; /* private context backpointer */
> - unsigned long packets; /* packets statistics */
> - unsigned long bytes; /* bytes statistics */
> + u64 packets; /* packets statistics */
> + u64 bytes; /* bytes statistics */
> };
>
> /* Driver private structure */
> @@ -743,5 +746,7 @@ struct bcm_sysport_priv {
>
> /* Ethtool */
> u32 msg_enable;
> + /* 64bit stats on 32bit/64bit Machine */
> + struct bcm_sysport_stats stats64;
> };
> #endif /* __BCM_SYSPORT_H */
>
--
Florian
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