1DEV_QUEUE_XMIT(9)           Network device support           DEV_QUEUE_XMIT(9)
2
3
4

NAME

6       dev_queue_xmit - transmit a buffer
7

SYNOPSIS

9       int dev_queue_xmit(struct sk_buff * skb);
10

ARGUMENTS

12       skb
13           buffer to transmit
14

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.
19
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.
23
24       -----------------------------------------------------------------------------------
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.
28
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.)
32
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
36

38Kernel Hackers Manual 2.6.       November 2011               DEV_QUEUE_XMIT(9)
Impressum