DEV_QUEUE_XMIT - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Network device support

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NAMEdev_queue_xmit − transmit a buffer

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SYNOPSISint dev_queue_xmit(struct sk_buff * skb);

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ARGUMENTSskb buffer to transmit

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DESCRIPTIONQueue a buffer for transmission to a network device​. The caller must have set the device and priority and built the buffer before calling this function​. The function can be called from an interrupt​. A negative errno code is returned on a failure​. A success does not guarantee the frame will be transmitted as it may be dropped due to congestion or traffic shaping​. −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− I notice this method can also return errors from the queue disciplines, including NET_XMIT_DROP, which is a positive value​. So, errors can also be positive​. Regardless of the return value, the skb is consumed, so it is currently difficult to retry a send to this method​. (You can bump the ref count before sending to hold a reference for retry if you are careful​.) When calling this method, interrupts MUST be enabled​. This is because the BH enable code must have IRQs enabled so that it will not deadlock​. −−BLG

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