From: Ido Schimmel <idosch@idosch.org>
To: David Ahern <dsahern@gmail.com>
Cc: netdev@vger.kernel.org, jiri@mellanox.com, idosch@mellanox.com,
kjlx@templeofstupid.com
Subject: Re: [RFC net-next 1/4] net: ipv6: Make inet6addr_validator a blocking notifier
Date: Wed, 11 Oct 2017 16:08:45 +0300 [thread overview]
Message-ID: <20171011130845.GA11493@splinter> (raw)
In-Reply-To: <1507653665-20540-2-git-send-email-dsahern@gmail.com>
On Tue, Oct 10, 2017 at 09:41:02AM -0700, David Ahern wrote:
> inet6addr_validator chain was added by commit 3ad7d2468f79f ("Ipvlan
> should return an error when an address is already in use") to allow
> address validation before changes are committed and to be able to
> fail the address change with an error back to the user. The address
> validation is not done for addresses received from router
> advertisements.
>
> Handling RAs in softirq context is the only reason for the notifier
> chain to be atomic versus blocking. Since the only current user, ipvlan,
> of the validator chain ignores softirq context, the notifier can be made
> blocking and simply not invoked for softirq path.
>
> The blocking option is needed by spectrum for example to validate
> resources for an adding an address to an interface.
>
> Signed-off-by: David Ahern <dsahern@gmail.com>
With the fixup posted later:
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
BTW, the in_softirq() check in ipvlan_addr6_validator_event() can be
removed after this patch.
next prev parent reply other threads:[~2017-10-11 13:08 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-10 16:41 [RFC net-next 0/4] mlxsw: spectrum_router: Add extack messages for RIF and VRF overflow David Ahern
2017-10-10 16:41 ` [RFC net-next 1/4] net: ipv6: Make inet6addr_validator a blocking notifier David Ahern
2017-10-10 19:32 ` David Ahern
2017-10-11 13:08 ` Ido Schimmel [this message]
2017-10-11 21:13 ` David Miller
2017-10-11 21:56 ` David Ahern
2017-10-10 16:41 ` [RFC net-next 2/4] net: Add extack to validator_info structs used for address notifier David Ahern
2017-10-11 13:37 ` Ido Schimmel
2017-10-10 16:41 ` [RFC net-next 3/4] mlxsw: spectrum: router: Add support for address validator notifier David Ahern
2017-10-11 13:54 ` Ido Schimmel
2017-10-11 15:19 ` David Ahern
2017-10-10 16:41 ` [RFC net-next 4/4] mlxsw: spectrum_router: Add extack message for RIF and VRF overflow David Ahern
2017-10-11 14:13 ` Ido Schimmel
2017-10-11 15:07 ` David Ahern
2017-10-11 15:10 ` Ido Schimmel
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