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Documentation: add a guideline for hard_start_xmit method

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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 2) Do not forget to update netdev->trans_start to jiffies after
each new tx packet is given to the hardware. 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 method, it is your driver's responsibility to free up the SKB
and in some finite amount of time. and in some finite amount of time.