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author | Alexander Aring <alex.aring@gmail.com> | 2015-09-18 12:30:42 +0300 |
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committer | Marcel Holtmann <marcel@holtmann.org> | 2015-09-22 12:51:20 +0300 |
commit | 838b83d63d2909f9136f3030dc4fffa8230c31da (patch) | |
tree | 7efa76e2b2a2df882e4ad941ef01806ad0664e94 /Documentation/fb/tgafb.txt | |
parent | a1da67b8117ddbe88c770b48b5b1527393b8c9c0 (diff) | |
download | linux-838b83d63d2909f9136f3030dc4fffa8230c31da.tar.xz |
ieee802154: introduce wpan_dev_header_ops
The current header_ops callback structure of net device are used mostly
from 802.15.4 upper-layers. Because this callback structure is a very
generic one, which is also used by e.g. DGRAM AF_PACKET sockets, we
can't make this callback structure 802.15.4 specific which is currently
is.
I saw the smallest "constraint" for calling this callback with
dev_hard_header/dev_parse_header by AF_PACKET which assign a 8 byte
array for address void pointers. Currently 802.15.4 specific protocols
like af802154 and 6LoWPAN will assign the "struct ieee802154_addr" as
these parameters which is greater than 8 bytes. The current callback
implementation for header_ops.create assumes always a complete
"struct ieee802154_addr" which AF_PACKET can't never handled and is
greater than 8 bytes.
For that reason we introduce now a "generic" create/parse header_ops
callback which allows handling with intra-pan extended addresses only.
This allows a small use-case with AF_PACKET to send "somehow" a valid
dataframe over DGRAM.
To keeping the current dev_hard_header behaviour we introduce a similar
callback structure "wpan_dev_header_ops" which contains 802.15.4 specific
upper-layer header creation functionality, which can be called by
wpan_dev_hard_header.
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'Documentation/fb/tgafb.txt')
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