1DEV_QUEUE_XMIT(9)           Network device support           DEV_QUEUE_XMIT(9)
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NAME

6       dev_queue_xmit - transmit a buffer
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SYNOPSIS

9       int dev_queue_xmit(struct sk_buff * skb);
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ARGUMENTS

12       skb
13           buffer to transmit
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DESCRIPTION

16       Queue a buffer for transmission to a network device. The caller must
17       have set the device and priority and built the buffer before calling
18       this function. The function can be called from an interrupt.
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20       A negative errno code is returned on a failure. A success does not
21       guarantee the frame will be transmitted as it may be dropped due to
22       congestion or traffic shaping.
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25       I notice this method can also return errors from the queue disciplines,
26       including NET_XMIT_DROP, which is a positive value. So, errors can also
27       be positive.
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29       Regardless of the return value, the skb is consumed, so it is currently
30       difficult to retry a send to this method. (You can bump the ref count
31       before sending to hold a reference for retry if you are careful.)
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33       When calling this method, interrupts MUST be enabled. This is because
34       the BH enable code must have IRQs enabled so that it will not deadlock.
35       --BLG
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38Kernel Hackers Manual 2.6.       November 2011               DEV_QUEUE_XMIT(9)
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