what does wrap_copy do in 8139too.c

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I was trying to understand how 8139too.c is developed,
I came across a function wrap_copy in it.
Can some one help to understand what it is doing.
What I  interpret  it is that some how the person is tying to copy
payload from DMA to sk buffer.
But still what exactly are we trying to achieve via wrap_copy function call?

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