* ndo_star_xmit() - resevered head and tailroom
@ 2018-06-01 16:14 Alexander Aring
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From: Alexander Aring @ 2018-06-01 16:14 UTC (permalink / raw)
To: netdev; +Cc: stefan, linux-wpan, kernel
Hi netdev community,
I am again on bug fixing in 6lowpan branch and thought that my
needed_headroom and needed_tailroom of net_device are available inside
my ndo_start_xmit() callback.
In case of a UDP socket, it was not the case. I send a fix now to use
skb_expand_copy() to make sure this space is available. (I need to
unshare the buffer anyway).
I am just curious is this suppose to work like that? I cannot believe
that I need to run a realloc() inside my ndo_start_xmit(). If possible,
when the net_device is known at socket layer it should allocate the
necessary space and I thought this is the designed transmit flow.
- Alex
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