1DEV_QUEUE_XMIT(9) Network device support DEV_QUEUE_XMIT(9)
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6 dev_queue_xmit - transmit a buffer
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9 int dev_queue_xmit(struct sk_buff * skb);
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12 skb
13 buffer to transmit
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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. June 2019 DEV_QUEUE_XMIT(9)