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Documentation: add a guideline for hard_start_xmit method 

Add a guideline not to modify SKBs.

Signed-off-by: Matti Linnanvuori <mattilinnanvuori@yahoo.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Matti Linnanvuori 2008-01-15 06:25:27 -08:00 committed by Jeff Garzik
parent be63a21c95
commit ce3ba1399d
1 changed files with 4 additions and 1 deletions
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5
Documentation/networking/driver.txt
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@ -61,7 +61,10 @@ Transmit path guidelines:
2) Do not forget to update netdev->trans_start to jiffies after
each new tx packet is given to the hardware.
3) Do not forget that once you return 0 from your hard_start_xmit
3) A hard_start_xmit method must not modify the shared parts of a
cloned SKB.
4) Do not forget that once you return 0 from your hard_start_xmit
method, it is your driver's responsibility to free up the SKB
and in some finite amount of time.