From: Sergei Shtylyov <sergei.shtylyov@cogentembedded•com>
To: Jesper Dangaard Brouer <brouer@redhat•com>,
netdev@vger•kernel.org, "David S. Miller" <davem@davemloft•net>
Cc: eugenia@mellanox•com, Alexander Duyck <alexander.duyck@gmail•com>,
alexei.starovoitov@gmail•com, saeedm@mellanox•com,
gerlitz.or@gmail•com
Subject: Re: [net-next PATCH V3 1/3] net: adjust napi_consume_skb to handle none-NAPI callers
Date: Thu, 10 Mar 2016 20:21:55 +0300 [thread overview]
Message-ID: <56E1AD33.3020507@cogentembedded.com> (raw)
In-Reply-To: <20160310145911.22901.28762.stgit@firesoul>
Hello.
On 03/10/2016 05:59 PM, Jesper Dangaard Brouer wrote:
> Some drivers reuse/share code paths that free SKBs between NAPI
> and none-NAPI calls. Adjust napi_consume_skb to handle this
> use-case.
>
> Before, calls from netpoll (w/ IRQs disabled) was handled and
> indicated with a budget zero indication. Use the same zero
> indication to handle calls not originating from NAPI/softirq.
> Simply handled by using dev_consume_skb_any().
>
> This adds an extra branch+call for the netpoll case (checking
> in_irq() + irqs_disabled()), but that is okay as this is a slowpath.
>
> Suggested-by: Alexander Duyck <aduyck@mirantis•com>
> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat•com>
> ---
> net/core/skbuff.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index 7af7ec635d90..bc62baa54ceb 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -801,9 +801,9 @@ void napi_consume_skb(struct sk_buff *skb, int budget)
> if (unlikely(!skb))
> return;
>
> - /* if budget is 0 assume netpoll w/ IRQs disabled */
> + /* Zero budget indicate none-NAPI context called us, like netpoll */
Non-NAPI?
[...]
MBR, Sergei
next prev parent reply other threads:[~2016-03-10 17:21 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-04 13:01 [net-next PATCH 0/7] net: bulk alloc side and more bulk free drivers Jesper Dangaard Brouer
2016-03-04 13:01 ` [net-next PATCH 1/7] mlx5: use napi_consume_skb API to get bulk free operations Jesper Dangaard Brouer
2016-03-04 13:01 ` [net-next PATCH 2/7] mlx4: " Jesper Dangaard Brouer
2016-03-08 19:24 ` David Miller
2016-03-09 11:00 ` Jesper Dangaard Brouer
2016-03-09 16:47 ` Alexander Duyck
2016-03-09 21:03 ` David Miller
2016-03-09 21:36 ` Jesper Dangaard Brouer
2016-03-09 21:43 ` Alexander Duyck
2016-03-09 21:47 ` Jesper Dangaard Brouer
2016-03-09 22:07 ` Alexander Duyck
2016-03-10 12:15 ` [net-next PATCH V2 0/3] net: bulk free adjustment and two driver use-cases Jesper Dangaard Brouer
2016-03-10 12:15 ` [net-next PATCH V2 1/3] net: adjust napi_consume_skb to handle none-NAPI callers Jesper Dangaard Brouer
2016-03-10 12:15 ` [net-next PATCH V2 2/3] mlx4: use napi_consume_skb API to get bulk free operations Jesper Dangaard Brouer
2016-03-10 13:59 ` Sergei Shtylyov
2016-03-10 14:59 ` [net-next PATCH V3 0/3] net: bulk free adjustment and two driver use-cases Jesper Dangaard Brouer
2016-03-10 14:59 ` [net-next PATCH V3 1/3] net: adjust napi_consume_skb to handle none-NAPI callers Jesper Dangaard Brouer
2016-03-10 17:21 ` Sergei Shtylyov [this message]
2016-03-11 7:45 ` Jesper Dangaard Brouer
2016-03-11 8:43 ` [net-next PATCH V4 0/3] net: bulk free adjustment and two driver use-cases Jesper Dangaard Brouer
2016-03-11 8:43 ` [net-next PATCH V4 1/3] net: adjust napi_consume_skb to handle non-NAPI callers Jesper Dangaard Brouer
2016-03-11 8:44 ` [net-next PATCH V4 2/3] mlx4: use napi_consume_skb API to get bulk free operations Jesper Dangaard Brouer
2016-03-11 8:44 ` [net-next PATCH V4 3/3] mlx5: " Jesper Dangaard Brouer
2016-03-14 2:35 ` [net-next PATCH V4 0/3] net: bulk free adjustment and two driver use-cases David Miller
2016-03-10 14:59 ` [net-next PATCH V3 2/3] mlx4: use napi_consume_skb API to get bulk free operations Jesper Dangaard Brouer
2016-03-10 14:59 ` [net-next PATCH V3 3/3] mlx5: " Jesper Dangaard Brouer
2016-03-10 12:15 ` [net-next PATCH V2 " Jesper Dangaard Brouer
2016-03-04 13:01 ` [net-next PATCH 3/7] net: bulk alloc and reuse of SKBs in NAPI context Jesper Dangaard Brouer
2016-03-13 14:06 ` Rana Shahout
2016-03-14 6:55 ` Jesper Dangaard Brouer
2016-03-04 13:01 ` [net-next PATCH 4/7] mlx5: use napi_alloc_skb API to get SKB bulk allocations Jesper Dangaard Brouer
2016-03-04 13:02 ` [net-next PATCH 5/7] mlx4: " Jesper Dangaard Brouer
2016-03-04 13:02 ` [net-next PATCH 6/7] net: introduce napi_alloc_skb_hint() for more use-cases Jesper Dangaard Brouer
2016-03-04 13:02 ` [net-next PATCH 7/7] mlx5: hint the NAPI alloc skb API about the expected bulk size Jesper Dangaard Brouer
2016-03-04 16:36 ` [net-next PATCH 0/7] net: bulk alloc side and more bulk free drivers Alexei Starovoitov
2016-03-04 19:15 ` Jesper Dangaard Brouer
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