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Subject[PATCH v14 10/17] If device is in zero-copy mode first, bonding will fail.
From: Xin Xiaohui <>

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 <>
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)

+ /* 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");

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