On Wednesday, February 06, 2013 4:50:39 am Lino Sanfilippo wrote: > > Hi all, > > I want to implement a device driver for a NIC which stores received data into > chunks within > a page (>=4k) in host memory. One page shall be used for multiple packets and > freed > after all mbufs linked to that page have been processed. So I would like to > know what is the recommended way > to handle this in FreeBSD? Any hints are very appreciated.
I think you can get what you want by allocating M_JUMBOP mbuf clusters for your receive buffers. When you want to split out a packet, allocate a new packet header mbuf and use m_split() to let it take over the rest of the 4k buffer and pass the original mbuf up to if_input() as the new packet. The new mbufs you attach to the cluster via m_split() will all hold a reference on the backing cluster and it won't be freed until all the mbufs are freed. -- John Baldwin _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
