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Implement capture support for offloaded RDMA traffic. This uses the RDMA
verbs "flow steering" interface, which is available in the Linux kernel
since version 3.12. The userspace interface is ibv_create_flow() - so
building this support in pcap adds a new dependency on libibverbs.
I added a new "rdmasniff" pcap module, which exposes RDMA devices under an
interface name equal to their libibverbs name. The module uses the RDMA
verbs interface to create a receive queue with a flow steering rule that
gets a copy of all packets, even offloaded packets generated by or consumed
by the hardware.
The autoconf test for a usable version of libibverbs is a bit complicated
because ibv_create_flow() is defined as an inline function in the header
file, so we need to find the library and header and then try to link a
program to check if the API is usable (it appeared in libibverbs 1.1.8).
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