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Date: Wed, 26 Mar 2014 18:25:01 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
john.r.fastabend@...el.com, Eric Dumazet <edumazet@...gle.com>,
andy@...yhouse.net, "dev@...nvswitch.org" <dev@...nvswitch.org>,
f.fainelli@...il.com, jeffrey.t.kirsher@...el.com,
Or Gerlitz <ogerlitz@...lanox.com>, ben@...adent.org.uk,
roopa@...ulusnetworks.com, jhs@...atatu.com,
linville@...driver.com, vyasevic@...hat.com, nhorman@...driver.com,
sfeldma@...ulusnetworks.com, stephen@...workplumber.org,
Daniel Borkmann <dborkman@...hat.com>,
"David S. Miller" <davem@...emloft.net>
Subject: Re: [ovs-dev] [patch net-next RFC v2 2/6] skbuff: add "missed_flow"
flag
Wed, Mar 26, 2014 at 05:59:12PM CET, alexei.starovoitov@...il.com wrote:
>On Wed, Mar 26, 2014 at 9:31 AM, Jiri Pirko <jiri@...nulli.us> wrote:
>> This flag sets incoming switch device in order to let know that the flow
>> which the skb is part of is missed. Listener may react to it
>> appropriately,
>>
>> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
>> ---
>> include/linux/filter.h | 1 +
>> include/linux/skbuff.h | 13 +++++++++++++
>> net/core/filter.c | 3 +++
>> 3 files changed, 17 insertions(+)
>>
>> diff --git a/include/linux/filter.h b/include/linux/filter.h
>> index e568c8e..38c7c04 100644
>> --- a/include/linux/filter.h
>> +++ b/include/linux/filter.h
>> @@ -154,6 +154,7 @@ enum {
>> BPF_S_ANC_VLAN_TAG,
>> BPF_S_ANC_VLAN_TAG_PRESENT,
>> BPF_S_ANC_PAY_OFFSET,
>> + BPF_S_ANC_MISSED_FLOW,
>
>Interesting use case for bpf...
>looks like it's not connected to userspace.
>Are you trying to extend ovs with switchdev api and bpf at once?
>How do you plan to use this bpf extension?
The motive fot this is to provides a user (userspace app) possibility to
get all skbs which were "flow-missed". He can adjust the filter so that
only these can get through.
>
>Thanks
>Alexei
>
>> };
>>
>> #endif /* __LINUX_FILTER_H__ */
>> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
>> index 03db95a..0100c2f 100644
>> --- a/include/linux/skbuff.h
>> +++ b/include/linux/skbuff.h
>> @@ -567,6 +567,7 @@ struct sk_buff {
>> * headers if needed
>> */
>> __u8 encapsulation:1;
>> + __u8 missed_flow:1;
>> /* 6/8 bit hole (depending on ndisc_nodetype presence) */
>> kmemcheck_bitfield_end(flags2);
>>
>> @@ -2993,5 +2994,17 @@ static inline unsigned int skb_gso_network_seglen(const struct sk_buff *skb)
>> skb_network_header(skb);
>> return hdr_len + skb_gso_transport_seglen(skb);
>> }
>> +
>> +/**
>> + * skb_mark_missed_flow - marks skb as a part of missed flow
>> + * @skb: buffer
>> + *
>> + * Marks skb as a part of missed flow.
>> + */
>> +static inline void skb_mark_missed_flow(struct sk_buff *skb)
>> +{
>> + skb->missed_flow = 1;
>> +}
>> +
>> #endif /* __KERNEL__ */
>> #endif /* _LINUX_SKBUFF_H */
>> diff --git a/net/core/filter.c b/net/core/filter.c
>> index ad30d62..048f11a 100644
>> --- a/net/core/filter.c
>> +++ b/net/core/filter.c
>> @@ -350,6 +350,9 @@ load_b:
>> case BPF_S_ANC_PAY_OFFSET:
>> A = __skb_get_poff(skb);
>> continue;
>> + case BPF_S_ANC_MISSED_FLOW:
>> + A = !!skb->missed_flow;
>> + continue;
>> case BPF_S_ANC_NLATTR: {
>> struct nlattr *nla;
>>
>> --
>> 1.8.5.3
>>
>> _______________________________________________
>> dev mailing list
>> dev@...nvswitch.org
>> http://openvswitch.org/mailman/listinfo/dev
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