linux-kernel - [PATCH net-next 0/3] dev_disable_lro() improvements for stacked devices

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Date:	Tue, 11 Nov 2014 09:21:30 +0100 (CET)
From:	Michal Kubecek <mkubecek@...e.cz>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jay Vosburgh <j.vosburgh@...il.com>,
	Veaceslav Falico <vfalico@...il.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	Jiri Pirko <jiri@...nulli.us>
Subject: [PATCH net-next 0/3] dev_disable_lro() improvements for stacked devices

Large receive offloading is known to cause problems if received packets
are passed to other host. Therefore the kernel disables it by calling
dev_disable_lro() whenever a network device is enslaved in a bridge or
forwarding is enabled for it (or globally). For virtual devices we need
to disable LRO on the underlying physical device (which is actually
receiving the packets).

Current dev_disable_lro() code handles this propagation for a vlan
(including 802.1ad nested vlan), macvlan or a vlan on top of a macvlan.
This patch adds LRO disabling propagation for

  - macvlan on top of a vlan or any stacked combination of those
  - bonding
  - teaming

In the bonding and teaming case, it is necessary to disable LRO not only
on slaves when dev_disable_lro() is called but also on any slave (port)
added later.

Michal Kubecek (3):
  net: handle more general stacking in dev_disable_lro()
  team: add helper to check if device is a team master
  net: propagate LRO disabling to bond and team slaves

 drivers/net/bonding/bond_main.c |  3 +++
 drivers/net/team/team.c         |  6 +++++-
 include/linux/netdevice.h       |  7 +++++++
 net/core/dev.c                  | 31 ++++++++++++++++++++++---------
 4 files changed, 37 insertions(+), 10 deletions(-)

-- 
1.8.4.5

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