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authorPatrick McHardy <kaber@trash.net>2008-07-15 01:50:15 -0400
committerDavid S. Miller <davem@davemloft.net>2008-07-15 01:50:15 -0400
commitbbd6ef87c544d88c30e4b762b1b61ef267a7d279 (patch)
treedd9fdfbde65332d3212290d1b8783666475bd861 /include/video
parentbc1d0411b804ad190cdadabac48a10067f17b9e6 (diff)
packet: support extensible, 64 bit clean mmaped ring structure
The tpacket_hdr is not 64 bit clean due to use of an unsigned long and can't be extended because the following struct sockaddr_ll needs to be at a fixed offset. Add support for a version 2 tpacket protocol that removes these limitations. Userspace can query the header size through a new getsockopt option and change the protocol version through a setsockopt option. The changes needed to switch to the new protocol version are: 1. replace struct tpacket_hdr by struct tpacket2_hdr 2. query header len and save 3. set protocol version to 2 - set up ring as usual 4. for getting the sockaddr_ll, use (void *)hdr + TPACKET_ALIGN(hdrlen) instead of (void *)hdr + TPACKET_ALIGN(sizeof(struct tpacket_hdr)) Steps 2 and 4 can be omitted if the struct sockaddr_ll isn't needed. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/video')
0 files changed, 0 insertions, 0 deletions