From: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
To: Eric Dumazet <eric.dumazet@gmail.com>,
Matteo Croce <mcroce@redhat.com>,
netdev@vger.kernel.org
Cc: Jay Vosburgh <j.vosburgh@gmail.com>,
Veaceslav Falico <vfalico@gmail.com>,
Andy Gospodarek <andy@greyhouse.net>,
"David S . Miller" <davem@davemloft.net>,
Stanislav Fomichev <sdf@google.com>,
Daniel Borkmann <daniel@iogearbox.net>,
Song Liu <songliubraving@fb.com>,
Alexei Starovoitov <ast@kernel.org>,
Paul Blakey <paulb@mellanox.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next v2 4/4] bonding: balance ICMP echoes in layer3+4 mode
Date: Tue, 29 Oct 2019 23:50:33 +0200 [thread overview]
Message-ID: <afdfd237-124d-0050-606f-cb5516c9e4d8@cumulusnetworks.com> (raw)
In-Reply-To: <576a4a96-861b-6a86-b059-6621a22d191c@gmail.com>
On 29/10/2019 23:03, Eric Dumazet wrote:
>
>
> On 10/29/19 11:35 AM, Nikolay Aleksandrov wrote:
>
>> Hi Matteo,
>> Wouldn't it be more useful and simpler to use some field to choose the slave (override the hash
>> completely) in a deterministic way from user-space ?
>> For example the mark can be interpreted as a slave id in the bonding (should be
>> optional, to avoid breaking existing setups). ping already supports -m and
>> anything else can set it, this way it can be used to do monitoring for a specific
>> slave with any protocol and would be a much simpler change.
>> User-space can then implement any logic for the monitoring case and as a minor bonus
>> can monitor the slaves in parallel. And the opposite as well - if people don't want
>> these balanced for some reason, they wouldn't enable it.
>>
>
> I kind of agree giving user more control. But I do not believe we need to use the mark
> (this might be already used by other layers)
>
> TCP uses sk->sk_hash to feed skb->hash.
>
> Anything using skb_set_owner_w() is also using sk->sk_hash if set.
>
> So presumably we could add a generic SO_TXHASH socket option to let user space
> read/set this field.
>
Right, I was just giving it as an example. Your suggestion sounds much better and
wouldn't interfere with other layers, plus we already use skb->hash in bond_xmit_hash()
and skb_set_owner_w() sets l4_hash if txhash is present which is perfect.
One thing - how do we deal with sk_rethink_txhash() ? I guess we'll need some way to
signal that the user specified the txhash and it is not to be recomputed ?
That can also be used to avoid the connect txhash set as well if SO_TXHASH was set prior
to the connect. It's quite late here, I'll look into it more tomorrow. :)
Thanks,
Nik
next prev parent reply other threads:[~2019-10-29 21:50 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-29 13:50 [PATCH net-next v2 0/4] ICMP flow improvements Matteo Croce
2019-10-29 13:50 ` [PATCH net-next v2 1/4] flow_dissector: add meaningful comments Matteo Croce
2019-10-29 13:50 ` [PATCH net-next v2 2/4] flow_dissector: skip the ICMP dissector for non ICMP packets Matteo Croce
2019-10-29 13:50 ` [PATCH net-next v2 3/4] flow_dissector: extract more ICMP information Matteo Croce
2019-10-29 13:50 ` [PATCH net-next v2 4/4] bonding: balance ICMP echoes in layer3+4 mode Matteo Croce
2019-10-29 18:35 ` Nikolay Aleksandrov
2019-10-29 18:41 ` Nikolay Aleksandrov
2019-10-29 19:45 ` Matteo Croce
2019-10-29 20:07 ` Nikolay Aleksandrov
2019-10-29 21:03 ` Eric Dumazet
2019-10-29 21:50 ` Nikolay Aleksandrov [this message]
2019-10-29 23:04 ` Eric Dumazet
2019-10-30 12:48 ` Nikolay Aleksandrov
2019-10-29 23:03 ` Matteo Croce
2019-10-29 23:14 ` Eric Dumazet
2019-10-29 23:19 ` Matteo Croce
2019-10-31 16:22 ` Matteo Croce
2019-10-31 0:21 ` [PATCH net-next v2 0/4] ICMP flow improvements David Miller
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