linux-kernel - [PATCH v16 10/17] If device is in zero-copy mode first, bonding will fail.

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Date:	Wed,  1 Dec 2010 16:08:21 +0800
From:	xiaohui.xin@...el.com
To:	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mst@...hat.com, mingo@...e.hu,
	davem@...emloft.net, herbert@...dor.apana.org.au,
	jdike@...ux.intel.com
Cc:	Xin Xiaohui <xiaohui.xin@...el.com>
Subject: [PATCH v16 10/17] If device is in zero-copy mode first, bonding will fail.

From: Xin Xiaohui <xiaohui.xin@...el.com>

If device is in this zero-copy mode first, we cannot handle this,
so fail it. This patch is for this.

If bonding is created first, and one of the device will be in zero-copy
mode, this will be handled by mp device. It will first check if all the
slaves have the zero-copy capability. If no, fail too. Otherwise make
all the slaves in zero-copy mode.

Signed-off-by: Xin Xiaohui <xiaohui.xin@...el.com>
---
 drivers/net/bonding/bond_main.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 3b16f62..dfb6a2c 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1428,6 +1428,10 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 			   bond_dev->name);
 	}
 
+	/* if the device is in zero-copy mode before bonding, fail it. */
+	if (dev_is_mpassthru(slave_dev))
+		return -EBUSY;
+
 	/* already enslaved */
 	if (slave_dev->flags & IFF_SLAVE) {
 		pr_debug("Error, Device was already enslaved\n");
-- 
1.7.3

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