Programmatically retrieve infiniband device ip address

Question

I'm trying to find programmatically the inet address of an Infiniband interface whose name is not know a priori.

I'm on Linux, and I would like to avoid the parsing of ifconfig (8) output. I've read the second comment on this answer, that suggests to use getifaddrs() to retrieve the interfaces, but then I cannot select the Infiniband one.

Any help is very appreciated.

score 2 · Accepted Answer · edited May 23 '17 at 12:10

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getifaddrs() returns one entry of type AF_PACKET for each interface, which has hardware address details, as described in this answer. In particular, the iface->ifa_addr holds a struct sockaddr_ll, and the sll_hatype member of that structure holds the hardware address type. So to figure out which interfaces are IPoIB you can just check which ones have hardware type ARPHRD_INFINIBAND.

edited May 23 '17 at 12:10

Community

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answered Nov 25 '11 at 17:08

Roland

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Thank you very much. I recovered the ib interface name and then iterated again on the list (returned by `getifaddrs`) to get the entry with the type `AF_INET`. – Luca Martini Nov 28 '11 at 09:44

score 0 · Answer 2 · answered Nov 25 '11 at 10:36

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You could try parsing some file under /proc/net/ like /proc/net/if_inet6 & /proc/net/dev. You can learn what ifconfig does by strace-ing it.

answered Nov 25 '11 at 10:36

Basile Starynkevitch

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Programmatically retrieve infiniband device ip address

2 Answers2