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Date: Mon, 20 Jun 2011 23:42:52 +0200
From: Eric Dumazet <eric.dumazet@...il.com>
To: Stephen Hemminger <shemminger@...tta.com>
Cc: David Miller <davem@...emloft.net>, jamal <hadi@...erus.ca>,
netdev@...r.kernel.org
Subject: Re: [PATCH net-next 5/5] ifb: convert to 64 bit stats
From: Stephen Hemminger <shemminger@...tta.com>
Le lundi 20 juin 2011 à 14:38 -0700, Stephen Hemminger a écrit :
> On Mon, 20 Jun 2011 23:27:01 +0200
> Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> > Le lundi 20 juin 2011 à 23:23 +0200, Eric Dumazet a écrit :
> > > Le lundi 20 juin 2011 à 14:12 -0700, Stephen Hemminger a écrit :
> > > > Convert input functional block device to use 64 bit stats.
> > > >
> > > > Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
> > > >
> > > > ---
> > > > v2 - add stats_sync
> > > >
> > >
> > > Acked-by: Eric Dumazet <eric.dumazet@...il.com>
> > >
> >
> > Ah well, I am wondering if ri_tasklet() & ifb_xmit() could run
> > concurrently
> >
> > If so, we need two separate syncp, one for each function.
>
> For the normal case that isn't possible but
> someone could be perverse and put an address on the ifb device and
> try and use like loopback?
Hmm, this can occur on normal case I think, on SMP.
Here is an updated patch
[PATCH net-next v3] ifb: convert to 64 bit stats
Convert input functional block device to use 64 bit stats.
[Eric Dumazet]: Use two different synchronization points for rx and tx.
Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
v2 - add stats_sync
v3 - must use two different sync
drivers/net/ifb.c | 58 +++++++++++++++++++++++++++++++++++++-------
1 file changed, 49 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index ce53f4a..2443e90 100644
--- a/drivers/net/ifb.c
+++ b/drivers/net/ifb.c
@@ -41,8 +41,16 @@
struct ifb_private {
struct tasklet_struct ifb_tasklet;
int tasklet_pending;
+
struct sk_buff_head rq;
+ u64 rx_packets;
+ u64 rx_bytes;
+ struct u64_stats_sync stats_rx_sync;
+
struct sk_buff_head tq;
+ u64 tx_packets;
+ u64 tx_bytes;
+ struct u64_stats_sync stats_tx_sync;
};
static int numifbs = 2;
@@ -54,10 +62,8 @@ static int ifb_close(struct net_device *dev);
static void ri_tasklet(unsigned long dev)
{
-
struct net_device *_dev = (struct net_device *)dev;
struct ifb_private *dp = netdev_priv(_dev);
- struct net_device_stats *stats = &_dev->stats;
struct netdev_queue *txq;
struct sk_buff *skb;
@@ -77,15 +83,18 @@ static void ri_tasklet(unsigned long dev)
skb->tc_verd = 0;
skb->tc_verd = SET_TC_NCLS(skb->tc_verd);
- stats->tx_packets++;
- stats->tx_bytes +=skb->len;
+
+ u64_stats_update_begin(&dp->stats_tx_sync);
+ dp->tx_packets++;
+ dp->tx_bytes += skb->len;
+ u64_stats_update_end(&dp->stats_tx_sync);
rcu_read_lock();
skb->dev = dev_get_by_index_rcu(&init_net, skb->skb_iif);
if (!skb->dev) {
rcu_read_unlock();
dev_kfree_skb(skb);
- stats->tx_dropped++;
+ _dev->stats.tx_dropped++;
if (skb_queue_len(&dp->tq) != 0)
goto resched;
break;
@@ -120,9 +129,39 @@ resched:
}
+static struct rtnl_link_stats64 *ifb_stats64(struct net_device *dev,
+ struct rtnl_link_stats64 *stats)
+{
+ const struct ifb_private *dp = netdev_priv(dev);
+ unsigned int start;
+
+ do {
+ start = u64_stats_fetch_begin_bh(&dp->stats_rx_sync);
+
+ stats->rx_packets = dp->rx_packets;
+ stats->rx_bytes = dp->rx_bytes;
+
+ } while (u64_stats_fetch_retry_bh(&dp->stats_rx_sync, start));
+
+ do {
+ start = u64_stats_fetch_begin_bh(&dp->stats_tx_sync);
+
+ stats->tx_packets = dp->tx_packets;
+ stats->tx_bytes = dp->tx_bytes;
+
+ } while (u64_stats_fetch_retry_bh(&dp->stats_tx_sync, start));
+
+ stats->rx_dropped = dev->stats.rx_dropped;
+ stats->tx_dropped = dev->stats.tx_dropped;
+
+ return stats;
+}
+
+
static const struct net_device_ops ifb_netdev_ops = {
.ndo_open = ifb_open,
.ndo_stop = ifb_close,
+ .ndo_get_stats64 = ifb_stats64,
.ndo_start_xmit = ifb_xmit,
.ndo_validate_addr = eth_validate_addr,
};
@@ -153,15 +192,16 @@ static void ifb_setup(struct net_device *dev)
static netdev_tx_t ifb_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ifb_private *dp = netdev_priv(dev);
- struct net_device_stats *stats = &dev->stats;
u32 from = G_TC_FROM(skb->tc_verd);
- stats->rx_packets++;
- stats->rx_bytes+=skb->len;
+ u64_stats_update_begin(&dp->stats_rx_sync);
+ dp->rx_packets++;
+ dp->rx_bytes += skb->len;
+ u64_stats_update_end(&dp->stats_rx_sync);
if (!(from & (AT_INGRESS|AT_EGRESS)) || !skb->skb_iif) {
dev_kfree_skb(skb);
- stats->rx_dropped++;
+ dev->stats.rx_dropped++;
return NETDEV_TX_OK;
}
--
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