* [PATCH net-next] net: loopback: clear skb->tstamp before netif_rx()
@ 2018-10-20 2:11 Eric Dumazet
2018-10-20 2:29 ` Soheil Hassas Yeganeh
2018-10-20 8:01 ` David Miller
0 siblings, 2 replies; 3+ messages in thread
From: Eric Dumazet @ 2018-10-20 2:11 UTC (permalink / raw)
To: David S . Miller
Cc: netdev, Eric Dumazet, Eric Dumazet, Willem de Bruijn,
Soheil Hassas Yeganeh
At least UDP / TCP stacks can now cook skbs with a tstamp using
MONOTONIC base (or arbitrary values with SCM_TXTIME)
Since loopback driver does not call (directly or indirectly)
skb_scrub_packet(), we need to clear skb->tstamp so that
net_timestamp_check() can eventually resample the time,
using ktime_get_real().
Fixes: 80b14dee2bea ("net: Add a new socket option for a future transmit time.")
Fixes: fb420d5d91c1 ("tcp/fq: move back to CLOCK_MONOTONIC")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Soheil Hassas Yeganeh <soheil@google.com>
---
drivers/net/loopback.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index a7207fa7e451311aed13cdeb100e0ea7922931bf..2df7f60fe05220c19896a251b6b15239f4b95112 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -69,6 +69,10 @@ static netdev_tx_t loopback_xmit(struct sk_buff *skb,
int len;
skb_tx_timestamp(skb);
+
+ /* do not fool net_timestamp_check() with various clock bases */
+ skb->tstamp = 0;
+
skb_orphan(skb);
/* Before queueing this packet to netif_rx(),
--
2.19.1.568.g152ad8e336-goog
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH net-next] net: loopback: clear skb->tstamp before netif_rx()
2018-10-20 2:11 [PATCH net-next] net: loopback: clear skb->tstamp before netif_rx() Eric Dumazet
@ 2018-10-20 2:29 ` Soheil Hassas Yeganeh
2018-10-20 8:01 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: Soheil Hassas Yeganeh @ 2018-10-20 2:29 UTC (permalink / raw)
To: Eric Dumazet; +Cc: David Miller, netdev, Eric Dumazet, Willem de Bruijn
On Fri, Oct 19, 2018 at 10:11 PM Eric Dumazet <edumazet@google.com> wrote:
>
> At least UDP / TCP stacks can now cook skbs with a tstamp using
> MONOTONIC base (or arbitrary values with SCM_TXTIME)
>
> Since loopback driver does not call (directly or indirectly)
> skb_scrub_packet(), we need to clear skb->tstamp so that
> net_timestamp_check() can eventually resample the time,
> using ktime_get_real().
>
> Fixes: 80b14dee2bea ("net: Add a new socket option for a future transmit time.")
> Fixes: fb420d5d91c1 ("tcp/fq: move back to CLOCK_MONOTONIC")
> Signed-off-by: Eric Dumazet <edumazet@google.com>
> Cc: Willem de Bruijn <willemb@google.com>
> Cc: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Thank you, Eric!
> ---
> drivers/net/loopback.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
> index a7207fa7e451311aed13cdeb100e0ea7922931bf..2df7f60fe05220c19896a251b6b15239f4b95112 100644
> --- a/drivers/net/loopback.c
> +++ b/drivers/net/loopback.c
> @@ -69,6 +69,10 @@ static netdev_tx_t loopback_xmit(struct sk_buff *skb,
> int len;
>
> skb_tx_timestamp(skb);
> +
> + /* do not fool net_timestamp_check() with various clock bases */
> + skb->tstamp = 0;
> +
> skb_orphan(skb);
>
> /* Before queueing this packet to netif_rx(),
> --
> 2.19.1.568.g152ad8e336-goog
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH net-next] net: loopback: clear skb->tstamp before netif_rx()
2018-10-20 2:11 [PATCH net-next] net: loopback: clear skb->tstamp before netif_rx() Eric Dumazet
2018-10-20 2:29 ` Soheil Hassas Yeganeh
@ 2018-10-20 8:01 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: David Miller @ 2018-10-20 8:01 UTC (permalink / raw)
To: edumazet; +Cc: netdev, eric.dumazet, willemb, soheil
From: Eric Dumazet <edumazet@google.com>
Date: Fri, 19 Oct 2018 19:11:26 -0700
> At least UDP / TCP stacks can now cook skbs with a tstamp using
> MONOTONIC base (or arbitrary values with SCM_TXTIME)
>
> Since loopback driver does not call (directly or indirectly)
> skb_scrub_packet(), we need to clear skb->tstamp so that
> net_timestamp_check() can eventually resample the time,
> using ktime_get_real().
>
> Fixes: 80b14dee2bea ("net: Add a new socket option for a future transmit time.")
> Fixes: fb420d5d91c1 ("tcp/fq: move back to CLOCK_MONOTONIC")
> Signed-off-by: Eric Dumazet <edumazet@google.com>
Applied, thanks Eric.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-10-20 2:11 [PATCH net-next] net: loopback: clear skb->tstamp before netif_rx() Eric Dumazet
2018-10-20 2:29 ` Soheil Hassas Yeganeh
2018-10-20 8:01 ` David Miller
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