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    Subject[PATCH v16 10/17] If device is in zero-copy mode first, bonding will fail.
    Date
    From: Xin Xiaohui <xiaohui.xin@intel.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@intel.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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