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From: Or Gerlitz <gerlitz.or@gmail.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>,
	Govindarajulu Varadarajan <_govind@gmx.com>,
	Yinghai Lu <yinghai@kernel.org>,
	David Miller <davem@davemloft.net>,
	NetDev <netdev@vger.kernel.org>,
	ssujith@cisco.com, gvaradar@cisco.com,
	"Christian Benvenuti (benve)" <benve@cisco.com>
Subject: Re: [PATCH net] net: sched: shrink struct qdisc_skb_cb to 28 bytes
Date: Fri, 19 Sep 2014 00:28:17 +0300	[thread overview]
Message-ID: <CAJ3xEMhMO7wydorRivtvSgJr9LBjRpYDJtbYfgd0ACPLYBXyzw@mail.gmail.com> (raw)
In-Reply-To: <1411057934.7106.275.camel@edumazet-glaptop2.roam.corp.google.com>

On Thu, Sep 18, 2014 at 7:32 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> On Thu, 2014-09-18 at 09:26 -0700, Stephen Hemminger wrote:
>> On Thu, 18 Sep 2014 08:02:05 -0700
>> Eric Dumazet <eric.dumazet@gmail.com> wrote:
>>
>> > From: Eric Dumazet <edumazet@google.com>
>> >
>> > We cannot make struct qdisc_skb_cb bigger without impacting IPoIB,
>> > or increasing skb->cb[] size.
>> >
>> > Commit e0f31d849867 ("flow_keys: Record IP layer protocol in
>> > skb_flow_dissect()") broke IPoIB.
>> >
>> > Only current offender is sch_choke, and this one do not need an
>> > absolutely precise flow key.
>> >
>> > If we store 17 bytes of flow key, its more than enough. (Its the actual
>> > size of flow_keys if it was a packed structure, but we might add new
>> > fields at the end of it later)
>> >
>> > Signed-off-by: Eric Dumazet <edumazet@google.com>
>>
>> Can we add BUILD_BUG to stop next time something smacks this.
>
> I though we had.
>
> Maybe IPoIB lacks one.
>
> Or, do you have an idea ?

Nope, we currently don't have such build time check, I saw you posted
one and I will be able to test it Sunday.

  parent reply	other threads:[~2014-09-18 21:28 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-09 18:32 [PATCH net-next 0/8] enic updates Govindarajulu Varadarajan
2014-06-09 18:32 ` [PATCH net-next 1/8] flow_keys: Record IP layer protocol in skb_flow_dissect() Govindarajulu Varadarajan
2014-06-10 13:11   ` Daniel Borkmann
2014-06-10 14:08     ` Govindarajulu Varadarajan
2014-06-10 14:26       ` Eric Dumazet
2014-06-11 22:06         ` David Miller
2014-06-11 22:08           ` David Miller
2014-06-12  5:38             ` Govindarajulu Varadarajan
2014-06-19 18:06   ` Chema Gonzalez
2014-06-19 18:52     ` Govindarajulu Varadarajan
2014-06-24  5:29   ` Yinghai Lu
2014-06-26  6:34     ` Govindarajulu Varadarajan
2014-09-18 14:18       ` Or Gerlitz
2014-09-18 14:38         ` Eric Dumazet
2014-09-18 15:02         ` [PATCH net] net: sched: shrink struct qdisc_skb_cb to 28 bytes Eric Dumazet
2014-09-18 16:26           ` Stephen Hemminger
2014-09-18 16:32             ` Eric Dumazet
2014-09-18 18:00               ` Eric Dumazet
2014-09-18 18:07                 ` Joe Perches
2014-09-18 19:14                   ` Eric Dumazet
2014-09-18 19:31                     ` Joe Perches
2014-09-18 20:31                       ` Eric Dumazet
2014-09-18 21:28               ` Or Gerlitz [this message]
2014-09-18 22:29           ` [net] " Doug Ledford
2014-09-19 12:07             ` Or Gerlitz
2014-09-22 18:38             ` David Miller
2014-09-22 18:22           ` [PATCH net] " David Miller
2014-06-09 18:32 ` [PATCH net-next 2/8] enic: fix return value in _vnic_dev_cmd Govindarajulu Varadarajan
2014-06-09 18:32 ` [PATCH net-next 3/8] enic: devcmd for adding IP 5 tuple hardware filters Govindarajulu Varadarajan
2014-06-09 18:32 ` [PATCH net-next 4/8] enic: alloc/free rx_cpu_rmap Govindarajulu Varadarajan
2014-06-09 18:44   ` Sergei Shtylyov
2014-06-10 13:52     ` Govindarajulu Varadarajan
2014-06-10 15:00       ` Sergei Shtylyov
2014-06-09 18:32 ` [PATCH net-next 5/8] enic: Add Accelerated RFS support Govindarajulu Varadarajan
2014-06-09 18:32 ` [PATCH net-next 6/8] enic: fix lockdep around devcmd_lock Govindarajulu Varadarajan
2014-06-09 18:32 ` [PATCH net-next 7/8] enic: add low latency socket busy_poll support Govindarajulu Varadarajan

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