From: David Miller <davem@davemloft.net>
To: steffen.klassert@secunet.com
Cc: Yurij.Plotnikov@oktetlabs.ru, bhutchings@solarflare.com,
netdev@vger.kernel.org, Alexandra.Kossovsky@oktetlabs.ru
Subject: Re: [RFC PATCH 1/3] ipv4: Invalidate the socket cached route on pmtu events if possible
Date: Fri, 18 Jan 2013 14:38:58 -0500 (EST) [thread overview]
Message-ID: <20130118.143858.897140770429940003.davem@davemloft.net> (raw)
In-Reply-To: <20130118081419.GC24987@secunet.com>
From: Steffen Klassert <steffen.klassert@secunet.com>
Date: Fri, 18 Jan 2013 09:14:20 +0100
> The route lookup in ipv4_sk_update_pmtu() might return a route
> different from the route we cached at the socket. This is because
> standart routes are per cpu, so each cpu has it's own struct rtable.
> This means that we do not invalidate the socket cached route if the
> NET_RX_SOFTIRQ is not served by the same cpu that the sending socket
> uses. As a result, the cached route reused until we disconnect.
>
> With this patch we invalidate the socket cached route if possible.
> If the socket is owened by the user, we can't update the cached
> route directly. A followup patch will implement socket release
> callback functions for datagram sockets to handle this case.
>
> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This looks fine.
next prev parent reply other threads:[~2013-01-18 19:39 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-19 13:10 PMTU discovery is broken on kernel 3.7.1 for UDP sockets Yurij M. Plotnikov
2012-12-19 13:35 ` Ben Hutchings
2012-12-19 14:27 ` Yurij M. Plotnikov
2012-12-19 19:37 ` Ben Hutchings
2012-12-20 7:14 ` Yurij M. Plotnikov
2012-12-20 7:34 ` Steffen Klassert
2012-12-20 11:22 ` Yurij M. Plotnikov
2012-12-20 12:35 ` Steffen Klassert
2012-12-21 10:22 ` Steffen Klassert
2013-01-14 8:26 ` Yurij M. Plotnikov
2013-01-14 12:52 ` Steffen Klassert
2013-01-18 8:11 ` Steffen Klassert
2013-01-18 8:14 ` [RFC PATCH 1/3] ipv4: Invalidate the socket cached route on pmtu events if possible Steffen Klassert
2013-01-18 19:38 ` David Miller [this message]
2013-01-19 0:54 ` Julian Anastasov
2013-01-21 6:43 ` Steffen Klassert
2013-01-18 8:15 ` [RFC PATCH 2/3] ipv4: Add a socket release callback for datagram sockets Steffen Klassert
2013-01-18 19:39 ` David Miller
2013-01-18 8:16 ` [RFC PATCH 3/3] xfrm4: Invalidate all ipv4 routes on IPsec pmtu events Steffen Klassert
2013-01-18 19:39 ` David Miller
2013-01-21 6:48 ` Steffen Klassert
2013-01-21 12:04 ` Steffen Klassert
2013-01-21 11:31 ` PMTU discovery is broken on kernel 3.7.1 for UDP sockets Yurij M. Plotnikov
2013-01-21 11:38 ` Steffen Klassert
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